"""
Adept Sampler v5 for Automatic1111 WebUI
Complete port with ALL custom samplers from ComfyUI

Version: 5.0
"""

import torch
import numpy as np
import math
from tqdm import trange
from modules import scripts, shared, script_callbacks
import gradio as gr
import k_diffusion.sampling

# Try import torchvision for detail enhancement
try:
    from torchvision.transforms.functional import gaussian_blur
    TORCHVISION_AVAILABLE = True
except ImportError:
    TORCHVISION_AVAILABLE = False
    print("⚠️ torchvision not available - detail enhancement disabled")

# ============================================================================
# GLOBAL STATE
# ============================================================================
ADEPT_STATE = {
    "enabled": False,
    "scale": 1.0,
    "shift": 0.0,
    "start_pct": 0.0,
    "end_pct": 1.0,
    "eta": 1.0,
    "s_noise": 1.0,
    "adaptive_eta": False,
    "scheduler": "Standard",
    "vae_reflection": False,
    
    # Custom sampler settings
    "use_custom_sampler": False,
    "custom_sampler": "Akashic Solver v2",
    "tau": 0.5,
    "phase_strength": 0.5,
    "solver_order": 2,
    "use_corrector": True,
    "phase_noise": False,
    "enhanced_derivative": False,
    "smea_strength": 0.0,
    "ndb_strength": 0.0,
    "eqvae_mode": "Off",

    # Mirror Correction Euler controls
    "mirror_correction_phase": 0.5,
    "mirror_smooth_phase": False,

    # CFG enhancement settings
    "cfg_drift_enabled": False,
    "cfg_drift_method": "mean",
    "cfg_drift_intensity": 0.5,
    "spectral_cfg_enabled": False,
    "spectral_multiplier": 1.0,
    "spectral_percentile": 5.0,
    "phase_cfg_enabled": False,
    "phase_cfg_alpha": 2.0,
    "phase_cfg_beta": 2.0,
    "cfg_runtime_mode": "off",   # off | a1111-postcfg | a1111-monkeypatch | native-hook

    # Internal bookkeeping for phase-aware CFG progress tracking
    "_cfg_step_idx": 0,
    "_cfg_total_steps": 1,
}

# Store original samplers
ORIGINAL_SAMPLERS = {}

# VAE Reflection state
_vae_reflection_active = False
_vae_original_padding_modes = {}

# CFG hook / callback runtime state
_ADEPT_CFG_AFTER_CB    = None
_ADEPT_CFG_DENOISER_CB = None
_ADEPT_NATIVE_CFG_HOOK_ACTIVE = False

# CFGDenoiser monkey-patch runtime state
_CFGD_ORIG_COMBINE       = None
_CFGD_ORIG_COMBINE_EDIT  = None
_CFGD_ORIG_FORWARD       = None
_CFGD_MONKEYPATCH_ACTIVE = False
_ADEPT_CFGDENOISER_CTX_ATTR = "_adept_cfg_ctx"

# ============================================================================
# BASIC UTILITY FUNCTIONS (from v3)
# ============================================================================

def to_d(x, sigma, denoised):
    """Convert denoised prediction to derivative."""
    diff = x - denoised
    safe_sigma = torch.clamp(sigma, min=1e-4)
    derivative = diff / safe_sigma
    
    sigma_adaptive_threshold = 1000.0 * (1.0 + sigma / 10.0)
    derivative_max = torch.abs(derivative).max()
    if derivative_max > sigma_adaptive_threshold:
        derivative = torch.clamp(derivative, -sigma_adaptive_threshold, sigma_adaptive_threshold)
    
    return derivative


def get_ancestral_step(sigma, sigma_next, eta=1.0):
    """Calculate ancestral step sizes."""
    if sigma_next == 0:
        return 0.0, 0.0
    sigma_up = min(sigma_next, eta * (sigma_next ** 2 * (sigma ** 2 - sigma_next ** 2) / sigma ** 2) ** 0.5)
    sigma_down = (sigma_next ** 2 - sigma_up ** 2) ** 0.5
    return sigma_down, sigma_up


def compute_dynamic_scale(step_idx, total_steps, base_scale, start_pct, end_pct):
    """
    Compute weight scale for the current step with smooth fade-in/fade-out.

    The fade ramp is proportional to the active window width rather than a
    fixed 0.1 absolute value.  For a narrow window (e.g. start=0.4, end=0.5)
    a hard-coded 0.1 ramp would consume the entire window and produce jarring
    or contradictory behaviour; normalising to 20 % of window width keeps the
    envelope sensible at any window size.

    Returns 1.0 (no-op) outside [start_pct, end_pct].
    """
    # Clamp / validate inputs so callers can pass raw UI values safely.
    start_pct  = max(0.0, min(float(start_pct), 1.0))
    end_pct    = max(start_pct, min(float(end_pct), 1.0))
    total_steps = max(total_steps, 1)
    progress    = step_idx / max(total_steps - 1, 1)

    if progress < start_pct or progress > end_pct:
        return 1.0

    window = end_pct - start_pct
    if window < 1e-6:
        # Degenerate window — treat as fully active for that single step.
        return float(base_scale)

    # Fade ramp = 20 % of window, capped at 0.05 so it never feels sluggish
    # on very wide windows and never feels jarring on narrow ones.
    ramp = min(0.20 * window, 0.05)

    if ramp > 0 and progress < start_pct + ramp:
        fade = (progress - start_pct) / ramp
        return 1.0 + (base_scale - 1.0) * fade
    elif ramp > 0 and progress > end_pct - ramp:
        fade = (end_pct - progress) / ramp
        return 1.0 + (base_scale - 1.0) * fade
    else:
        return float(base_scale)


def default_noise_sampler(x):
    """Simple noise sampler fallback."""
    def sampler(sigma, sigma_next):
        return torch.randn_like(x)
    return sampler


def get_noise_sampler(x):
    """Get noise sampler for the given tensor."""
    return default_noise_sampler(x)


# ============================================================================
# ADVANCED UTILITY FUNCTIONS
# ============================================================================

def to_d_enhanced_ancestral(x, sigma, denoised, eta, progress, generator=None):
    """Enhanced derivative for ancestral sampling."""
    diff = x - denoised
    safe_sigma = torch.clamp(sigma, min=1e-4)
    base_derivative = diff / safe_sigma

    def safe_randn_like(tensor, generator=None):
        if generator is None:
            return torch.randn_like(tensor)
        try:
            return torch.randn(tensor.shape, device=tensor.device, dtype=tensor.dtype, generator=generator)
        except (TypeError, AttributeError):
            return torch.randn_like(tensor)

    if eta > 1.0:
        eta_correction = 0.02 * (eta - 1.0) * safe_randn_like(diff, generator) * progress
        base_derivative = base_derivative + eta_correction
    elif eta < 1.0:
        eta_correction = 0.015 * (1.0 - eta) * safe_randn_like(diff, generator) * (1.0 - progress)
        base_derivative = base_derivative - eta_correction

    if progress < 0.3:
        phase_correction = 0.01 * safe_randn_like(diff, generator)
        base_derivative = base_derivative + phase_correction
    elif progress > 0.7:
        phase_correction = 0.008 * safe_randn_like(diff, generator)
        base_derivative = base_derivative - phase_correction

    sigma_adaptive_threshold = 500.0 * (1.0 + sigma / 10.0)
    derivative_max = torch.abs(base_derivative).max()
    if derivative_max > sigma_adaptive_threshold:
        base_derivative = torch.clamp(base_derivative, -sigma_adaptive_threshold, sigma_adaptive_threshold)

    return base_derivative


def apply_dynamic_thresholding(x, percentile=0.995, clamp_range=1.0):
    """Dynamic thresholding for high CFG."""
    if percentile >= 1.0:
        return x
    
    try:
        batch_size = x.shape[0]
        x_flat = x.view(batch_size, -1)
        
        abs_max = torch.abs(x_flat).max(dim=1, keepdim=True)[0]
        if abs_max.max() < 5.0:
            return x
        
        k = max(1, int(x_flat.shape[1] * (1.0 - percentile)))
        topk_vals = torch.topk(torch.abs(x_flat), k=k, dim=1, largest=True)[0]
        s = topk_vals[:, -1:].clamp(min=1.0)
        
        threshold = s * 2.5
        mask = torch.abs(x_flat) > threshold
        x_flat = torch.where(mask, torch.sign(x_flat) * threshold, x_flat)
        x_flat = x_flat * 0.98
        
        return x_flat.view(x.shape)
    except Exception as e:
        return x


def compute_compensation_ratio(r, step_idx, total_steps, base_ratio=1.0):
    """DC-Solver compensation."""
    progress = step_idx / max(total_steps - 1, 1)
    if progress < 0.3:
        phase_weight = 1.5
    elif progress < 0.7:
        phase_weight = 1.0
    else:
        phase_weight = 1.3
    return base_ratio * phase_weight * (1.0 + 0.1 * math.tanh(r - 1.0))


def compute_tau_eqvae(progress, base_tau=0.5, phase_strength=0.5):
    """Phase-aware tau for standard VAE."""
    if progress < 0.30:
        phase_factor = 1.0 + 0.2 * phase_strength
    elif progress < 0.60:
        phase_factor = 1.0 - 0.15 * phase_strength
    else:
        phase_factor = 1.0 - 0.3 * phase_strength
    return min(1.0, max(0.0, base_tau * phase_factor))


def compute_eqvae_tau(progress, base_tau, phase_strength):
    """EQ-VAE tau with shifted phases."""
    if progress < 0.25:
        phase_factor = 1.0 + 0.10 * phase_strength
    elif progress < 0.55:
        phase_factor = 1.0 - 0.10 * phase_strength
    else:
        phase_factor = 1.0 - 0.20 * phase_strength
    return min(1.0, max(0.0, base_tau * phase_factor))


def compute_eqvae_noise_scale(base_s_noise, progress):
    """EQ-VAE noise scale."""
    eqvae_base_factor = 0.88
    if progress < 0.25:
        phase_factor = 1.0 + 0.05 * (1.0 - progress / 0.25)
    elif progress < 0.60:
        phase_factor = 1.0 - 0.05 * ((progress - 0.25) / 0.35)
    else:
        phase_factor = 0.95
    return base_s_noise * eqvae_base_factor * phase_factor


def compute_eqvae_ndb(progress, ndb_strength):
    """Native Detail Boost for EQ-VAE."""
    if ndb_strength <= 0:
        return 0.5, 0.0
    
    blur_sigma = 0.6
    if progress < 0.30:
        phase_progress = progress / 0.30
        high_freq_boost = 0.03 * ndb_strength * phase_progress
    elif progress < 0.60:
        phase_progress = (progress - 0.30) / 0.30
        high_freq_boost = (0.03 + 0.07 * phase_progress) * ndb_strength
    else:
        phase_progress = (progress - 0.60) / 0.40
        high_freq_boost = (0.10 + 0.10 * phase_progress) * ndb_strength
    return blur_sigma, high_freq_boost


def compute_native_detail_boost(progress, ndb_strength=0.0):
    """Native Detail Boost for standard VAE."""
    if ndb_strength <= 0:
        return 1.0, 0.0
    
    if progress < 0.30:
        phase_progress = progress / 0.30
        high_freq_boost = 0.03 * ndb_strength * phase_progress
    elif progress < 0.60:
        phase_progress = (progress - 0.30) / 0.30
        high_freq_boost = (0.03 + 0.07 * phase_progress) * ndb_strength
    else:
        phase_progress = (progress - 0.60) / 0.40
        high_freq_boost = (0.10 + 0.08 * phase_progress) * ndb_strength
    return 1.0, high_freq_boost


def compute_smea_factor(progress, smea_strength=0.5):
    """SMEA coherency."""
    if smea_strength <= 0:
        return 1.0
    smea_interp = 0.5 * (1 + math.sin(math.pi * (progress - 0.5)))
    return 1.0 - smea_strength * (1.0 - smea_interp)




# ============================================================================
# ADVANCED CFG TECHNIQUES from reForge
# ============================================================================

def apply_spectral_modulation_clybius(noise_pred, multiplier=1.0, percentile=5.0):
    """
    Clybius Spectral Modulation: Apply frequency-domain corrections to noise prediction.
    
    This is the correct implementation based on ComfyUI-Latent-Modifiers.
    It should be applied to noise_pred (cond - uncond), NOT to denoised latent.
    
    Args:
        noise_pred: The noise prediction tensor (cond - uncond)
        multiplier: Modulation strength (0=none, 1=full Clybius effect). Default: 1.0
        percentile: Upper/lower percentile threshold. Default: 5.0
    
    Returns:
        Spectrally modulated noise prediction
    """
    if multiplier == 0 or percentile <= 0:
        return noise_pred
    
    try:
        # FFT
        fourier = torch.fft.fft2(noise_pred, dim=(-2, -1))
        
        # Log amplitude (with small epsilon for numerical stability)
        log_amp = torch.log(torch.sqrt(fourier.real ** 2 + fourier.imag ** 2) + 1e-8)
        
        # Compute quantiles on absolute log amplitude
        log_amp_flat = log_amp.abs().flatten(2)
        quantile_low = torch.quantile(log_amp_flat, percentile * 0.01, dim=2)
        quantile_high = torch.quantile(log_amp_flat, 1 - percentile * 0.01, dim=2)
        
        # Expand quantiles back to log_amp shape
        quantile_low = quantile_low.unsqueeze(-1).unsqueeze(-1).expand(log_amp.shape)
        quantile_high = quantile_high.unsqueeze(-1).unsqueeze(-1).expand(log_amp.shape)
        
        # Create masks (Clybius approach)
        # mask_low: boost values below low threshold (range 1.0 to 1.5)
        # mask_high: reduce values above high threshold (range 0.5 to 1.0)
        mask_low = ((log_amp < quantile_low).float() + 1).clamp_(max=1.5)
        mask_high = ((log_amp < quantile_high).float()).clamp_(min=0.5)
        
        # Apply modulation via exponentiation
        filtered_fourier = fourier * ((mask_low * mask_high) ** multiplier)
        
        # Inverse FFT
        result = torch.fft.ifft2(filtered_fourier, dim=(-2, -1)).real
        
        return result
        
    except Exception as e:
        print(f"⚠️ Spectral modulation failed: {e}")
        return noise_pred



def create_spectral_modulation_cfg_hook(multiplier=1.0, percentile=5.0):
    """
    Create a CFG hook that applies Clybius spectral modulation to noise prediction.
    
    This hooks into reForge's set_model_sampler_cfg_function to intercept
    the CFG calculation and apply spectral modulation at the correct point.
    
    Args:
        multiplier: Modulation strength (0=none, 1=full). Default: 1.0
        percentile: Frequency percentile threshold. Default: 5.0
    
    Returns:
        A hook function to pass to set_model_sampler_cfg_function
    """
    def spectral_cfg_hook(args):
        cond = args["cond"]
        uncond = args["uncond"]
        cond_scale = args["cond_scale"]
        sigma = args["sigma"]
        x_orig = args["input"]
        
        # Reshape sigma for broadcasting
        sigma = sigma.view(sigma.shape[:1] + (1,) * (cond.ndim - 1))
        
        # Convert to v-pred space (from RescaleCFG reference)
        x = x_orig / (sigma * sigma + 1.0)
        cond_v = ((x - (x_orig - cond)) * (sigma ** 2 + 1.0) ** 0.5) / (sigma)
        uncond_v = ((x - (x_orig - uncond)) * (sigma ** 2 + 1.0) ** 0.5) / (sigma)
        
        # Compute noise prediction
        noise_pred = cond_v - uncond_v
        
        # Apply Clybius spectral modulation to noise prediction
        noise_pred_modulated = apply_spectral_modulation_clybius(noise_pred, multiplier, percentile)
        
        # Compute CFG with modified noise prediction
        x_cfg = uncond_v + cond_scale * noise_pred_modulated
        
        # Convert back from v-pred space
        return x_orig - (x - x_cfg * sigma / (sigma * sigma + 1.0) ** 0.5)
    
    return spectral_cfg_hook



def apply_combat_cfg_drift(latent, method='mean', intensity=1.0):
    """
    Combat CFG Drift: Reduce mean drift from high CFG values.

    Based on ComfyUI-Latent-Modifiers.

    As CFG increases, the latent mean can drift away from 0, which causes
    color shifts and other artifacts. This technique reduces the drift
    proportionally based on intensity.

    Args:
        latent: The latent tensor to correct
        method: 'mean' or 'median'. Default: 'mean'
        intensity: How much drift to remove (0=none, 1=full). Default: 1.0

    Returns:
        Drift-corrected latent
    """
    if intensity <= 0:
        return latent

    try:
        if method == 'median':
            # Compute global median per batch (across all channels and spatial dims)
            center = latent.view(latent.shape[0], -1).median(dim=-1, keepdim=True)[0]
            center = center.view(latent.shape[0], 1, 1, 1)
        else:
            # Compute global mean per batch (across all channels and spatial dims)
            # This matches ComfyUI's PostCFGsubtractMeanNode implementation
            center = latent.mean(dim=(1, 2, 3), keepdim=True)

        # Remove drift proportionally based on intensity
        # intensity=1.0 removes all drift, intensity=0.5 removes half
        return latent - center * intensity

    except Exception as e:
        print(f"⚠️ Combat CFG drift failed: {e}")
        return latent



def compute_phase_aware_cfg_scale(base_scale, progress, alpha=2.0, beta=2.0):
    """
    Phase-Aware CFG Scaling: Adjust CFG scale based on sampling progress.

    Inspired by β-CFG (arXiv:2502.10574).

    CFG effectiveness varies by sampling phase:
    - Early: Lower CFG allows manifold exploration
    - Middle: Higher CFG for prompt adherence
    - Late: Lower CFG to stay on data manifold

    Args:
        base_scale: The user-specified CFG scale
        progress: Sampling progress (0.0 to 1.0)
        alpha: Beta distribution alpha parameter. Default: 2.0
        beta: Beta distribution beta parameter. Default: 2.0

    Returns:
        Adjusted CFG scale for the current step
    """
    try:
        # Use a simple polynomial approximation of beta distribution
        # Beta(2,2) peaks at 0.5 with a smooth curve
        # f(x) = 6 * x * (1-x) for Beta(2,2), normalized to peak at 1
        if alpha == 2.0 and beta == 2.0:
            # Simple case: symmetric peak at 0.5
            scale_factor = 4.0 * progress * (1.0 - progress)  # Peaks at 1.0 when progress=0.5
            scale_factor = 0.7 + 0.6 * scale_factor  # Range: 0.7 to 1.3
        else:
            # General case: use polynomial approximation
            # Mode of Beta(a,b) is at (a-1)/(a+b-2)
            mode = (alpha - 1.0) / (alpha + beta - 2.0) if (alpha + beta) > 2 else 0.5
            # Create a smooth curve that peaks at the mode
            dist_from_mode = abs(progress - mode)
            scale_factor = 1.0 - 0.3 * dist_from_mode * 2  # Simple linear falloff
            scale_factor = max(0.7, min(1.3, scale_factor))

        return base_scale * scale_factor

    except Exception as e:
        print(f"⚠️ Phase-aware CFG scaling failed: {e}")
        return base_scale



# apply_cfg_techniques() removed — was using legacy keys (akashic_combat_cfg_drift /
# akashic_combat_drift_intensity) that no longer match the live CFG runtime, which
# operates through configure_cfg_runtime() / adept_after_cfg_callback instead.


# ============================================================================
# DUAL-MODE CFG RUNTIME (A1111 callbacks + optional native hook)
# ============================================================================

def create_phase_aware_native_cfg_hook(base_hook=None, alpha=2.0, beta=2.0):
    """
    Native CFG hook for Forge/reForge-like backends that support
    set_model_sampler_cfg_function(). Applies phase-aware CFG scaling,
    then optionally delegates to a downstream hook (e.g. spectral modulation).
    """
    def hook(args):
        cond       = args["cond"]
        uncond     = args["uncond"]
        cond_scale = float(args["cond_scale"])
        sigma      = args["sigma"]
        x_orig     = args["input"]

        total_steps = max(int(ADEPT_STATE.get("_cfg_total_steps", 1)), 1)
        step_idx    = int(ADEPT_STATE.get("_cfg_step_idx", 0))
        progress    = min(max(step_idx / max(total_steps - 1, 1), 0.0), 1.0)

        phased_scale = compute_phase_aware_cfg_scale(cond_scale, progress,
                                                     alpha=alpha, beta=beta)
        patched_args = dict(args)
        patched_args["cond_scale"] = phased_scale

        if base_hook is not None:
            return base_hook(patched_args)

        # Vanilla CFG combine with phased scale
        sigma_b = sigma.view(sigma.shape[:1] + (1,) * (cond.ndim - 1))
        x       = x_orig / (sigma_b * sigma_b + 1.0)
        cond_v  = ((x - (x_orig - cond))  * (sigma_b ** 2 + 1.0) ** 0.5) / sigma_b
        uncond_v = ((x - (x_orig - uncond)) * (sigma_b ** 2 + 1.0) ** 0.5) / sigma_b
        x_cfg   = uncond_v + phased_scale * (cond_v - uncond_v)
        return x_orig - (x - x_cfg * sigma_b / (sigma_b * sigma_b + 1.0) ** 0.5)
    return hook


def create_combined_native_cfg_hook():
    """
    Build one composite native hook from whatever CFG features are enabled.
    Layer order: phase-aware scale → spectral modulation.
    Returns None if nothing is enabled (caller should clear the hook).
    """
    base_hook = None
    if ADEPT_STATE.get("spectral_cfg_enabled", False):
        base_hook = create_spectral_modulation_cfg_hook(
            multiplier=ADEPT_STATE.get("spectral_multiplier", 1.0),
            percentile=ADEPT_STATE.get("spectral_percentile", 5.0),
        )
    if ADEPT_STATE.get("phase_cfg_enabled", False):
        return create_phase_aware_native_cfg_hook(
            base_hook=base_hook,
            alpha=ADEPT_STATE.get("phase_cfg_alpha", 2.0),
            beta=ADEPT_STATE.get("phase_cfg_beta", 2.0),
        )
    return base_hook


def adept_cfg_denoiser_callback(params):
    """
    Official A1111 on_cfg_denoiser callback. Used only to track step
    counters for phase-aware progress bookkeeping; the public API here
    doesn't expose cond/uncond predictions so we can't do CFG math.
    """
    ADEPT_STATE["_cfg_step_idx"]    = int(getattr(params, "sampling_step",        0))
    ADEPT_STATE["_cfg_total_steps"] = int(getattr(params, "total_sampling_steps", 1))


def adept_after_cfg_callback(params):
    """
    Official A1111 on_cfg_after_cfg callback.
    Combat CFG Drift is the only technique that maps cleanly here,
    because AfterCFGCallbackParams only provides (x, sampling_step,
    total_sampling_steps) — no raw cond/uncond tensors.
    """
    if not ADEPT_STATE.get("enabled", False):
        return
    if not ADEPT_STATE.get("cfg_drift_enabled", False):
        return
    try:
        params.x = apply_combat_cfg_drift(
            params.x,
            method=ADEPT_STATE.get("cfg_drift_method", "mean"),
            intensity=ADEPT_STATE.get("cfg_drift_intensity", 0.5),
        )
    except Exception as e:
        print(f"⚠️ Adept post-CFG drift callback failed: {e}")


def uninstall_a1111_cfg_callbacks():
    global _ADEPT_CFG_AFTER_CB, _ADEPT_CFG_DENOISER_CB
    for cb in (_ADEPT_CFG_AFTER_CB, _ADEPT_CFG_DENOISER_CB):
        if cb is not None:
            try:
                script_callbacks.remove_callbacks_for_function(cb)
            except Exception:
                pass
    _ADEPT_CFG_AFTER_CB    = None
    _ADEPT_CFG_DENOISER_CB = None


def install_a1111_cfg_callbacks():
    global _ADEPT_CFG_AFTER_CB, _ADEPT_CFG_DENOISER_CB
    uninstall_a1111_cfg_callbacks()
    _ADEPT_CFG_DENOISER_CB = adept_cfg_denoiser_callback
    _ADEPT_CFG_AFTER_CB    = adept_after_cfg_callback
    script_callbacks.on_cfg_denoiser(  _ADEPT_CFG_DENOISER_CB, name="adept_cfg_denoiser")
    script_callbacks.on_cfg_after_cfg( _ADEPT_CFG_AFTER_CB,    name="adept_after_cfg")


def _get_native_cfg_hook_target():
    """
    Locate a Forge/reForge-like model object that supports
    set_model_sampler_cfg_function(), if one exists.
    """
    sd = getattr(shared, "sd_model", None)
    candidates = [
        sd,
        getattr(sd, "forge_objects", None),
        getattr(sd, "model", None),
        getattr(getattr(sd, "model", None), "model", None) if sd else None,
    ]
    for obj in candidates:
        if obj is not None and hasattr(obj, "set_model_sampler_cfg_function"):
            return obj
    return None


def uninstall_native_cfg_hook():
    global _ADEPT_NATIVE_CFG_HOOK_ACTIVE
    target = _get_native_cfg_hook_target()
    if target is not None:
        try:
            target.set_model_sampler_cfg_function(None)
        except Exception:
            pass
    _ADEPT_NATIVE_CFG_HOOK_ACTIVE = False


def install_native_cfg_hook():
    global _ADEPT_NATIVE_CFG_HOOK_ACTIVE
    target = _get_native_cfg_hook_target()
    if target is None:
        _ADEPT_NATIVE_CFG_HOOK_ACTIVE = False
        return False
    hook = create_combined_native_cfg_hook()
    try:
        target.set_model_sampler_cfg_function(hook)   # None clears it if nothing enabled
        _ADEPT_NATIVE_CFG_HOOK_ACTIVE = (hook is not None)
        return True
    except Exception as e:
        print(f"⚠️ Adept native CFG hook install failed: {e}")
        _ADEPT_NATIVE_CFG_HOOK_ACTIVE = False
        return False


# ============================================================================
# CFGDenoiser MONKEY-PATCH (stock A1111 fallback for spectral/phase CFG)
# ============================================================================

def _adept_cfg_progress_from_denoiser(denoiser):
    """Compute sampling progress [0,1] from CFGDenoiser step counters."""
    total_steps = max(int(getattr(denoiser, "total_steps", 1) or 1), 1)
    step_idx    = int(getattr(denoiser, "step", 0))
    return min(max(step_idx / max(total_steps - 1, 1), 0.0), 1.0)


def _adept_nativeish_cfg_term(x_i, sigma_i, cond_i, uncond_i, scale):
    """
    Approximate native hook behavior for one cond/uncond pair.
    Feeds x/sigma/cond/uncond into the same composite hook builder used in
    native-hook mode so stock A1111 gets as close as possible to Forge parity.
    Falls back to plain weighted delta if hook is unavailable or errors.
    """
    if abs(float(scale)) < 1e-12:
        return torch.zeros_like(uncond_i)
    hook = create_combined_native_cfg_hook()
    if hook is None:
        return (cond_i - uncond_i) * float(scale)
    try:
        combined = hook({
            "cond":       cond_i,
            "uncond":     uncond_i,
            "cond_scale": float(scale),
            "sigma":      sigma_i,
            "input":      x_i,
        })
        return combined - uncond_i
    except Exception as e:
        print(f"⚠️ Adept native-ish CFG term fallback: {e}")
        return (cond_i - uncond_i) * float(scale)


def patch_cfg_denoiser():
    """
    Stock A1111 fallback for Spectral Modulation + Phase-Aware CFG.

    Strategy:
      1. Thin forward() wrapper that stashes x / sigma on the instance so the
         combine methods can reach them — original forward logic is untouched.
      2. Patched combine_denoised() uses those values to call the same composite
         hook builder as native-hook mode, giving near-parity behaviour.
      3. Patched combine_denoised_for_edit_model() does the same for pix2pix.

    This is intentionally safer than a full forward() rewrite: upstream A1111
    changes to refiner/masking/skip-uncond logic remain unaffected.
    """
    global _CFGD_ORIG_COMBINE, _CFGD_ORIG_COMBINE_EDIT, _CFGD_ORIG_FORWARD, _CFGD_MONKEYPATCH_ACTIVE
    try:
        from modules import sd_samplers_cfg_denoiser as sd_cfg
    except Exception as e:
        print(f"⚠️ Adept CFGDenoiser patch import failed: {e}")
        _CFGD_MONKEYPATCH_ACTIVE = False
        return False

    cls = sd_cfg.CFGDenoiser

    if _CFGD_ORIG_COMBINE is None:
        _CFGD_ORIG_COMBINE = cls.combine_denoised
    if _CFGD_ORIG_COMBINE_EDIT is None:
        _CFGD_ORIG_COMBINE_EDIT = cls.combine_denoised_for_edit_model
    if _CFGD_ORIG_FORWARD is None:
        _CFGD_ORIG_FORWARD = cls.forward

    # --- forward wrapper: stash x/sigma, then run original ---
    def adept_forward(self, x, sigma, uncond, cond, cond_scale, s_min_uncond, image_cond):
        setattr(self, _ADEPT_CFGDENOISER_CTX_ATTR, {
            "x":          x,
            "sigma":      sigma,
            "uncond":     uncond,
            "cond":       cond,
            "cond_scale": float(cond_scale),
        })
        try:
            return _CFGD_ORIG_FORWARD(self, x, sigma, uncond, cond,
                                      cond_scale, s_min_uncond, image_cond)
        finally:
            try:
                delattr(self, _ADEPT_CFGDENOISER_CTX_ATTR)
            except AttributeError:
                pass

    # --- combine_denoised: per-cond native-ish or plain path ---
    def adept_combine_denoised(self, x_out, conds_list, uncond, cond_scale):
        denoised_uncond = x_out[-uncond.shape[0]:]
        denoised = torch.clone(denoised_uncond)
        ctx      = getattr(self, _ADEPT_CFGDENOISER_CTX_ATTR, None)
        x_ctx    = None if ctx is None else ctx.get("x",     None)
        sigma_ctx = None if ctx is None else ctx.get("sigma", None)
        progress = _adept_cfg_progress_from_denoiser(self)

        eff_scale = float(cond_scale)
        if ADEPT_STATE.get("phase_cfg_enabled", False):
            eff_scale = compute_phase_aware_cfg_scale(
                eff_scale, progress,
                alpha=ADEPT_STATE.get("phase_cfg_alpha", 2.0),
                beta =ADEPT_STATE.get("phase_cfg_beta",  2.0),
            )

        use_nativeish = (
            (ADEPT_STATE.get("spectral_cfg_enabled", False) or
             ADEPT_STATE.get("phase_cfg_enabled",    False))
            and x_ctx is not None and sigma_ctx is not None
        )

        for i, conds in enumerate(conds_list):
            for cond_index, weight in conds:
                cond_i  = x_out[cond_index:cond_index + 1]
                uncond_i = denoised_uncond[i:i + 1]

                if use_nativeish:
                    term = _adept_nativeish_cfg_term(
                        x_i     = x_ctx[i:i + 1],
                        sigma_i  = sigma_ctx[i:i + 1],
                        cond_i   = cond_i,
                        uncond_i = uncond_i,
                        scale    = float(weight) * eff_scale,
                    )
                    denoised[i:i + 1] += term
                else:
                    delta = cond_i - uncond_i
                    if ADEPT_STATE.get("spectral_cfg_enabled", False):
                        delta = apply_spectral_modulation_clybius(
                            delta,
                            multiplier=ADEPT_STATE.get("spectral_multiplier", 1.0),
                            percentile=ADEPT_STATE.get("spectral_percentile", 5.0),
                        )
                    denoised[i:i + 1] += delta * (float(weight) * eff_scale)

        return denoised

    # --- combine_denoised_for_edit_model: pix2pix / instruct path ---
    def adept_combine_denoised_for_edit_model(self, x_out, cond_scale):
        out_cond, out_img_cond, out_uncond = x_out.chunk(3)
        ctx       = getattr(self, _ADEPT_CFGDENOISER_CTX_ATTR, None)
        x_ctx     = None if ctx is None else ctx.get("x",     None)
        sigma_ctx = None if ctx is None else ctx.get("sigma", None)
        progress  = _adept_cfg_progress_from_denoiser(self)

        eff_scale = float(cond_scale)
        if ADEPT_STATE.get("phase_cfg_enabled", False):
            eff_scale = compute_phase_aware_cfg_scale(
                eff_scale, progress,
                alpha=ADEPT_STATE.get("phase_cfg_alpha", 2.0),
                beta =ADEPT_STATE.get("phase_cfg_beta",  2.0),
            )

        # Native-ish path when context is available
        if (ADEPT_STATE.get("spectral_cfg_enabled", False) or
                ADEPT_STATE.get("phase_cfg_enabled", False)):
            if x_ctx is not None and sigma_ctx is not None:
                try:
                    hook = create_combined_native_cfg_hook()
                    if hook is not None:
                        base = hook({
                            "cond":       out_cond,
                            "uncond":     out_img_cond,
                            "cond_scale": eff_scale,
                            "sigma":      sigma_ctx,
                            "input":      x_ctx,
                        })
                        return base + self.image_cfg_scale * (out_img_cond - out_uncond)
                except Exception as e:
                    print(f"⚠️ Adept edit-model native-ish fallback: {e}")

        # Plain path (no context or hook failed)
        delta = out_cond - out_img_cond
        if ADEPT_STATE.get("spectral_cfg_enabled", False):
            delta = apply_spectral_modulation_clybius(
                delta,
                multiplier=ADEPT_STATE.get("spectral_multiplier", 1.0),
                percentile=ADEPT_STATE.get("spectral_percentile", 5.0),
            )
        return out_uncond + eff_scale * delta + self.image_cfg_scale * (out_img_cond - out_uncond)

    try:
        cls.forward                       = adept_forward
        cls.combine_denoised              = adept_combine_denoised
        cls.combine_denoised_for_edit_model = adept_combine_denoised_for_edit_model
        _CFGD_MONKEYPATCH_ACTIVE = True
        return True
    except Exception as e:
        print(f"⚠️ Adept CFGDenoiser patch failed: {e}")
        _CFGD_MONKEYPATCH_ACTIVE = False
        return False


def unpatch_cfg_denoiser():
    global _CFGD_MONKEYPATCH_ACTIVE
    try:
        from modules import sd_samplers_cfg_denoiser as sd_cfg
    except Exception:
        _CFGD_MONKEYPATCH_ACTIVE = False
        return False
    cls = sd_cfg.CFGDenoiser
    try:
        if _CFGD_ORIG_FORWARD is not None:
            cls.forward = _CFGD_ORIG_FORWARD
        if _CFGD_ORIG_COMBINE is not None:
            cls.combine_denoised = _CFGD_ORIG_COMBINE
        if _CFGD_ORIG_COMBINE_EDIT is not None:
            cls.combine_denoised_for_edit_model = _CFGD_ORIG_COMBINE_EDIT
        _CFGD_MONKEYPATCH_ACTIVE = False
        return True
    except Exception as e:
        print(f"⚠️ Adept CFGDenoiser unpatch failed: {e}")
        _CFGD_MONKEYPATCH_ACTIVE = False
        return False


def configure_cfg_runtime():
    """
    Select and activate the right CFG runtime mode:
      off                 – nothing enabled; all hooks/callbacks/patches cleared
      a1111-postcfg       – stock A1111; Combat CFG Drift only via official callback
      a1111-monkeypatch   – stock A1111; Spectral + Phase-Aware via CFGDenoiser patch
      native-hook         – Forge/reForge-like backend; all three via sampler CFG hook

    Returns the mode string so process() can log it.
    """
    # If the extension is globally disabled, always tear down and return off.
    if not ADEPT_STATE.get("enabled", False):
        uninstall_a1111_cfg_callbacks()
        uninstall_native_cfg_hook()
        unpatch_cfg_denoiser()
        ADEPT_STATE["cfg_runtime_mode"] = "off"
        return "off"

    drift    = ADEPT_STATE.get("cfg_drift_enabled",   False)
    spectral = ADEPT_STATE.get("spectral_cfg_enabled", False)
    phase    = ADEPT_STATE.get("phase_cfg_enabled",    False)

    # Always tear down everything first for a clean slate
    uninstall_a1111_cfg_callbacks()
    uninstall_native_cfg_hook()
    unpatch_cfg_denoiser()

    if not (drift or spectral or phase):
        ADEPT_STATE["cfg_runtime_mode"] = "off"
        return "off"

    # Prefer native hook if backend supports it
    native_target = _get_native_cfg_hook_target()
    if native_target is not None:
        install_a1111_cfg_callbacks()   # keeps drift working in native mode too
        install_native_cfg_hook()
        ADEPT_STATE["cfg_runtime_mode"] = "native-hook"
        return "native-hook"

    # Stock A1111: always install callbacks (drift)
    install_a1111_cfg_callbacks()

    if spectral or phase:
        ok = patch_cfg_denoiser()
        if ok:
            ADEPT_STATE["cfg_runtime_mode"] = "a1111-monkeypatch"
            print("✅ Adept: stock A1111 CFGDenoiser monkey-patch active (spectral/phase + drift enabled)")
            return "a1111-monkeypatch"
        print("⚠️ Adept: CFGDenoiser monkey-patch failed; falling back to post-CFG drift only")

    ADEPT_STATE["cfg_runtime_mode"] = "a1111-postcfg"
    return "a1111-postcfg"


def sa_solver_step(x, d_history, sigma, sigma_next, tau, s_noise=1.0, noise_sampler=None, 
                   order=2, ndb_strength=0.0, progress=0.0, eqvae_mode=False, eqvae_blur_sigma=None):
    """SA-Solver step - CRITICAL for Akashic Solver."""
    dt = sigma_next - sigma
    
    if len(d_history) >= 2 and order >= 2:
        sigma_cur, d_cur = d_history[-1]
        sigma_prev, d_prev = d_history[-2]
        
        h_prev = sigma_cur - sigma_prev
        r = abs(dt / (h_prev + 1e-8)) if abs(h_prev) > 1e-8 else 1.0
        r = min(r, 2.0)
        
        if len(d_history) >= 3 and order >= 3:
            sigma_0, d_0 = d_history[-3]
            h_0 = sigma_prev - sigma_0
            h_1 = h_prev
            
            if abs(h_0) > 1e-6 and abs(h_1) > 1e-6:
                r0 = min(abs(h_1 / h_0), 2.0)
                r1 = min(abs(dt / (h_1 + 1e-8)), 2.0)
                
                tau_blend = 1.0 - tau
                c0_ab3 = 1.0 + (1.0 + r0) * r1 / 2.0
                c1_ab3 = -(1.0 + r0) * r1 / 2.0
                c2_ab3 = r0 * r1 / 2.0
                c0 = tau_blend * c0_ab3 + (1.0 - tau_blend) * 1.0
                c1 = tau_blend * c1_ab3
                c2 = tau_blend * c2_ab3
                
                c_sum = c0 + c1 + c2
                if abs(c_sum) > 1e-8:
                    c0 /= c_sum
                    c1 /= c_sum
                    c2 /= c_sum
                else:
                    c0, c1, c2 = 1.0, 0.0, 0.0
                
                d_interp = c0 * d_cur + c1 * d_prev + c2 * d_0
            else:
                tau_blend = 1.0 - tau
                c1_ab2 = 1.0 + 0.5 * r
                c2_ab2 = -0.5 * r
                c1 = tau_blend * c1_ab2 + (1.0 - tau_blend) * 1.0
                c2 = tau_blend * c2_ab2
                c_sum = c1 + c2
                if abs(c_sum) > 1e-8:
                    c1 /= c_sum
                    c2 /= c_sum
                d_interp = c1 * d_cur + c2 * d_prev
        else:
            tau_blend = 1.0 - tau
            c1_ab2 = 1.0 + 0.5 * r
            c2_ab2 = -0.5 * r
            c1 = tau_blend * c1_ab2 + (1.0 - tau_blend) * 1.0
            c2 = tau_blend * c2_ab2
            c_sum = c1 + c2
            if abs(c_sum) > 1e-8:
                c1 /= c_sum
                c2 /= c_sum
            d_interp = c1 * d_cur + c2 * d_prev
    elif len(d_history) >= 1:
        d_interp = d_history[-1][1]
    else:
        d_interp = torch.zeros_like(x)
    
    # Compute sigma_up based on tau (controls stochasticity)
    sigma_up = 0.0
    if tau > 0 and sigma_next > 0 and noise_sampler is not None:
        sigma_ancestral_sq = sigma_next ** 2 * (sigma ** 2 - sigma_next ** 2) / (sigma ** 2 + 1e-8)
        sigma_ancestral = sigma_ancestral_sq ** 0.5 if sigma_ancestral_sq > 0 else 0.0
        sigma_up = tau * sigma_ancestral
        
        sigma_down = (sigma_next ** 2 - sigma_up ** 2) ** 0.5
        dt_adjusted = sigma_down - sigma
        
        x_det = x + d_interp * dt_adjusted
        noise = noise_sampler(sigma, sigma_next) * s_noise * sigma_up
        
        # Apply Native Detail Boost if enabled
        if ndb_strength > 0 and TORCHVISION_AVAILABLE:
            # Use EQ-VAE optimized NDB parameters if in EQ-VAE mode
            if eqvae_mode:
                blur_sigma, high_freq_boost = compute_eqvae_ndb(progress, ndb_strength)
            else:
                _, high_freq_boost = compute_native_detail_boost(progress, ndb_strength)
                blur_sigma = 0.5  # Default blur sigma
            
            # Override blur_sigma if explicitly provided
            if eqvae_blur_sigma is not None:
                blur_sigma = eqvae_blur_sigma
            
            # Extract high-frequency component from noise using Gaussian blur
            try:
                low_freq_noise = gaussian_blur(noise, kernel_size=3, sigma=blur_sigma)
                high_freq_noise = noise - low_freq_noise
                noise = noise + high_freq_noise * high_freq_boost
            except Exception:
                pass  # Fallback: use original noise if blur fails
        
        x_next = x_det + noise
    else:
        x_next = x + d_interp * dt
    
    return x_next, sigma_up


def create_detail_enhanced_model(model, x, sigmas, settings):
    # NOTE: Detail Enhancement is currently an internal/experimental path.
    # It is not wired into the UI and callers always pass
    # use_detail_enhancement=False, so this function is never invoked at
    # runtime.  Kept for future re-integration; do not rely on it.
    """Detail enhancement wrapper."""
    if not TORCHVISION_AVAILABLE:
        return model
    
    base_strength = settings.get('detail_enhancement_strength', 0.05)
    radius = settings.get('detail_separation_radius', 0.5)
    total_steps = len(sigmas) - 1
    
    class DetailEnhancer:
        def __init__(self):
            self.current_step = 0
        
        def __call__(self, x_current, sigma, **kwargs):
            denoised = model(x_current, sigma, **kwargs)
            
            try:
                low_freq = gaussian_blur(denoised, kernel_size=3, sigma=radius)
                high_freq = denoised - low_freq
                
                progress = min(self.current_step / max(total_steps, 1), 1.0)
                strength = base_strength * (0.5 + progress)
                
                enhanced = denoised + high_freq * strength
                self.current_step += 1
                return enhanced
            except Exception:
                return denoised
    
    return DetailEnhancer()


# ============================================================================
# ============================================================================
# ============================================================================
# CUSTOM ADVANCED SAMPLERS (Complete port from ComfyUI)
# ============================================================================

@torch.no_grad()
def sample_adept_solver(model, x, sigmas, extra_args=None, callback=None, disable=None, 
                        order=2, use_corrector=True, use_detail_enhancement=False, settings=None):
    """
    Adept Solver: A unified training-free diffusion solver synthesizing improvements from:
    - DPM-Solver++ (data prediction, dynamic thresholding)
    - UniPC (unified predictor-corrector framework)
    - DEIS (exponential integrator)
    - DC-Solver (dynamic compensation)
    """
    extra_args = {} if extra_args is None else extra_args
    settings = settings or {}
    s_in = x.new_ones([x.shape[0]])
    
    order = max(1, min(order, 3))
    
    print(f"🚀 Adept Solver active (Order: {order}, Corrector: {'On' if use_corrector else 'Off'})")
    
    active_model = model
    # use_detail_enhancement is always False from current call-sites;
    # the block below is preserved for future re-integration but is not
    # currently reachable via the UI.
    if use_detail_enhancement and TORCHVISION_AVAILABLE:
        active_model = create_detail_enhanced_model(model, x, sigmas, settings)

    model_outputs = []
    
    for i in range(len(sigmas) - 1):
        sigma = sigmas[i]
        sigma_next = sigmas[i + 1]
        
        denoised = active_model(x, sigma * s_in, **extra_args)
        
        if extra_args.get('cond_scale', 1.0) > 7.0:
            denoised = apply_dynamic_thresholding(denoised, percentile=0.995)
        
        d = to_d(x, sigma, denoised)

        derivative_max = torch.abs(d).max()
        sigma_adaptive_threshold = 1000.0 * (1.0 + sigma / 10.0)
        if torch.isnan(d).any() or torch.isinf(d).any() or derivative_max > sigma_adaptive_threshold:
            print(f"⚠️ Extreme derivative detected at step {i}/{len(sigmas)-1}. Clamping for stability.")
            d = torch.clamp(d, -sigma_adaptive_threshold, sigma_adaptive_threshold)
            if torch.isnan(d).any() or torch.isinf(d).any():
                d = torch.zeros_like(d)

        model_outputs.append((sigma, d))
        if len(model_outputs) > order:
            model_outputs.pop(0)
        
        dt = sigma_next - sigma
        
        if len(model_outputs) == 1 or order == 1:
            x_pred = x + d * dt
        elif len(model_outputs) == 2 and order >= 2:
            sigma_prev, d_prev = model_outputs[-2]
            d_cur = model_outputs[-1][1]
            
            h = sigma - sigma_prev
            compensation_ratio = compute_compensation_ratio(h.item() if torch.is_tensor(h) else float(h), i, len(sigmas))
            
            d_interp = d_cur + compensation_ratio * (d_cur - d_prev)
            x_pred = x + d_interp * dt
        else:
            sigma_0, d_0 = model_outputs[-3]
            sigma_1, d_1 = model_outputs[-2]
            sigma_2, d_2 = model_outputs[-1]
            
            h_0 = sigma_2 - sigma_1
            h_1 = sigma_1 - sigma_0
            
            h_0_val = h_0.item() if torch.is_tensor(h_0) else float(h_0)
            h_1_val = h_1.item() if torch.is_tensor(h_1) else float(h_1)
            
            if abs(h_1_val) < 1e-6:
                compensation_ratio = compute_compensation_ratio(h_0_val, i, len(sigmas))
                d_interp = d_2 + compensation_ratio * (d_2 - d_1)
            else:
                r0 = h_0_val / h_1_val
                c0 = 1.0 + r0 / 2.0
                c1 = -r0 / 2.0
                c2 = 0.0
                
                c_sum = c0 + c1 + c2
                c0 /= c_sum
                c1 /= c_sum
                c2 = 1.0 - c0 - c1
                
                d_interp = c0 * d_2 + c1 * d_1 + c2 * d_0
            
            x_pred = x + d_interp * dt
        
        if use_corrector and i < len(sigmas) - 2:
            denoised_pred = active_model(x_pred, sigma_next * s_in, **extra_args)
            
            if extra_args.get('cond_scale', 1.0) > 7.0:
                denoised_pred = apply_dynamic_thresholding(denoised_pred, percentile=0.995)

            d_pred = to_d(x_pred, sigma_next, denoised_pred)

            if torch.isnan(d_pred).any() or torch.isinf(d_pred).any() or torch.abs(d_pred).max() > 1000.0:
                d_pred = torch.clamp(d_pred, -100.0, 100.0)
                if torch.isnan(d_pred).any() or torch.isinf(d_pred).any():
                    d_pred = torch.zeros_like(d_pred)
            
            dt = sigma_next - sigma
            x = x + (d + d_pred) * dt * 0.5
        else:
            x = x_pred
        
        if torch.isnan(x).any() or torch.isinf(x).any():
            print(f"❌ CRITICAL: NaN/Inf detected at step {i}/{len(sigmas)-1}!")
            if i == 0:
                raise RuntimeError("NaN/Inf on first step - check model/inputs")
            
            print("   Attempting recovery with conservative Euler step...")
            denoised_safe = active_model(x, sigma * s_in, **extra_args)
            if torch.isnan(denoised_safe).any():
                raise RuntimeError("Model producing NaN - check CFG scale and model")
            
            d_safe = to_d(x, sigma, denoised_safe)
            dt_safe = (sigma_next - sigma) * 0.5
            x = x + d_safe * dt_safe
            use_corrector = False
            print("   Recovery successful. Corrector disabled for stability.")
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigmas[i], 'denoised': denoised})
    
    return x


@torch.no_grad()
def sample_adept_ancestral_solver(model, x, sigmas, extra_args=None, callback=None, disable=None,
                                   eta=1.0, s_noise=1.0, adaptive_eta=False, phase_noise=False,
                                   phase_strength=0.5, enhanced_derivative=False, 
                                   use_detail_enhancement=False, settings=None):
    """
    Enhanced Adept Ancestral Solver: Advanced ancestral sampling with phase-aware adaptations.
    
    Key innovations:
    1. Adaptive ancestral step sizing that changes throughout sampling phases
    2. Phase-aware noise injection (more noise early, less noise late)
    3. Enhanced derivative computation with ancestral-specific corrections
    4. Dynamic eta scheduling for better control
    """
    extra_args = {} if extra_args is None else extra_args
    settings = settings or {}
    s_in = x.new_ones([x.shape[0]])
    
    print(f"🚀 Enhanced Adept Ancestral Solver active (η: {eta:.2f}, s_noise: {s_noise:.2f})")
    print(f"   Adaptive Eta: {adaptive_eta}, Phase Noise: {phase_noise}, Enhanced Derivative: {enhanced_derivative}")
    
    active_model = model
    # use_detail_enhancement is always False from current call-sites.
    if use_detail_enhancement and TORCHVISION_AVAILABLE:
        active_model = create_detail_enhanced_model(model, x, sigmas, settings)

    noise_sampler = get_noise_sampler(x)
    for i in range(len(sigmas) - 1):
        sigma = sigmas[i]
        sigma_next = sigmas[i + 1]
        
        progress = i / max(len(sigmas) - 1, 1)
        
        if adaptive_eta:
            if progress < 0.3:
                current_eta = eta * 1.08
            elif progress < 0.7:
                current_eta = eta * 0.95
            else:
                current_eta = eta * 1.02
        else:
            current_eta = eta
        
        denoised = active_model(x, sigma * s_in, **extra_args)
        
        if extra_args.get('cond_scale', 1.0) > 7.0:
            denoised = apply_dynamic_thresholding(denoised, percentile=0.995)
        
        if enhanced_derivative:
            d = to_d_enhanced_ancestral(x, sigma, denoised, current_eta, progress, None)
        else:
            d = to_d(x, sigma, denoised)

        derivative_max = torch.abs(d).max()
        sigma_adaptive_threshold = 1000.0 * (1.0 + sigma / 10.0)
        if torch.isnan(d).any() or torch.isinf(d).any() or derivative_max > sigma_adaptive_threshold:
            d = torch.clamp(d, -sigma_adaptive_threshold, sigma_adaptive_threshold)
            if torch.isnan(d).any() or torch.isinf(d).any():
                d = torch.zeros_like(d)

        if sigma_next > 0:
            sigma_up = min(sigma_next, current_eta * (sigma_next ** 2 * (sigma ** 2 - sigma_next ** 2) / sigma ** 2) ** 0.5)
            sigma_down = (sigma_next ** 2 - sigma_up ** 2) ** 0.5
        else:
            sigma_up = 0.0
            sigma_down = 0.0
        
        dt = sigma_down - sigma
        x_pred = x + d * dt
        
        if sigma_next > 0:
            if phase_noise:
                if progress < 0.25:
                    target_multiplier = 1.0 + (0.05 * min(progress / 0.25, 1.0))
                elif progress < 0.6:
                    target_multiplier = 1.0 - (0.02 * min((progress - 0.25) / 0.35, 1.0))
                else:
                    target_multiplier = 1.0 - (0.05 * min((progress - 0.6) / 0.4, 1.0))

                noise_multiplier = 1.0 + (target_multiplier - 1.0) * phase_strength
                adaptive_s_noise = s_noise * noise_multiplier
            else:
                adaptive_s_noise = s_noise
            
            noise = noise_sampler(sigma, sigma_next) * adaptive_s_noise * sigma_up
            x = x_pred + noise
        else:
            x = x_pred
        
        if torch.isnan(x).any() or torch.isinf(x).any():
            print(f"❌ CRITICAL: NaN/Inf detected at step {i}/{len(sigmas)-1}!")
            if i == 0:
                raise RuntimeError("NaN/Inf on first step - check model/inputs")
            
            print("   Attempting recovery...")
            denoised_safe = active_model(x, sigma * s_in, **extra_args)
            if torch.isnan(denoised_safe).any():
                raise RuntimeError("Model producing NaN - check CFG scale and model")
            
            d_safe = to_d(x, sigma, denoised_safe)
            dt_safe = (sigma_next - sigma) * 0.5
            x = x + d_safe * dt_safe
            print("   Recovery successful.")
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigmas[i], 'denoised': denoised})
    
    return x


@torch.no_grad()
def sample_mirror_correction_euler(model, x, sigmas, extra_args=None, callback=None, disable=None,
                                    eta=1.0, s_noise=1.0, correction_phase=0.5, smooth_phase=False):
    """
    Mirror Correction Euler: Euler Ancestral with a semantic reflection probe.

    In the first `correction_phase` fraction of steps, uses a 3-call Heun correction:
      x_probe = 2*D(x) - x  (reflection of x through its own denoised prediction)
    The probe lies on the denoising trajectory, giving a curvature estimate for the
    Heun correction. Remaining steps: standard 1-call Euler Ancestral.

    Args:
        eta: Ancestral noise coefficient. 0=deterministic, 1=full ancestral. Default: 1.0
        s_noise: Noise scale multiplier. Default: 1.0
        correction_phase: Fraction of steps that receive the 3-call correction. Default: 0.5
        smooth_phase: Use continuous log-sigma weighting instead of a binary cutoff. Default: False
    """
    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])

    print(f"🔮 Mirror Correction Euler active (η: {eta:.2f}, s_noise: {s_noise:.2f})")
    print(f"   Correction Phase: {correction_phase:.2f}, Smooth Phase: {smooth_phase}")

    noise_sampler = get_noise_sampler(x)
    n_steps = len(sigmas) - 1

    log_sigma_phase = None
    log_sigma_max = None
    smooth_denom = 1e-6
    if smooth_phase and n_steps > 0:
        sigma_max_val = sigmas[0].clamp(min=1e-6)
        phase_idx = min(int(correction_phase * n_steps), n_steps - 1)
        sigma_phase_val = sigmas[phase_idx].clamp(min=1e-6)
        log_sigma_max = torch.log(sigma_max_val).item()
        log_sigma_phase = torch.log(sigma_phase_val).item()
        smooth_denom = max(log_sigma_max - log_sigma_phase, 1e-6)

    for i in range(n_steps):
        sigma = sigmas[i]
        sigma_next = sigmas[i + 1]
        progress = i / max(n_steps - 1, 1)

        denoised = model(x, sigma * s_in, **extra_args)
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigma, 'denoised': denoised})

        d = to_d(x, sigma, denoised)

        if sigma_next > 0:
            sigma_up = min(sigma_next, eta * (sigma_next ** 2 * (sigma ** 2 - sigma_next ** 2) / sigma ** 2) ** 0.5)
            sigma_down = (sigma_next ** 2 - sigma_up ** 2) ** 0.5
        else:
            sigma_up = 0.0
            sigma_down = 0.0
        dt = sigma_down - sigma

        if smooth_phase and log_sigma_phase is not None:
            log_sig = torch.log(sigma.clamp(min=1e-6)).item()
            t = max(0.0, min(1.0, (log_sig - log_sigma_phase) / smooth_denom))
            correction_weight = t ** 0.5

            if correction_weight > 1e-3 and sigma_next > 0:
                x_probe = 2 * denoised - x
                d_probe = to_d(x_probe, sigma, model(x_probe, sigma * s_in, **extra_args))

                d_diff_norm = (d - d_probe).norm()
                d_scale = (d.norm() + d_probe.norm()) / 2 + 1e-6
                gradient_agreement = max(0.0, 1.0 - (d_diff_norm / d_scale).item())
                effective_weight = correction_weight * gradient_agreement

                if effective_weight > 1e-3:
                    x3 = x + ((d + d_probe) / 2) * dt
                    d3 = to_d(x3, sigma, model(x3, sigma * s_in, **extra_args))
                    d_heun = (d + d3) / 2
                    if not (torch.isnan(d_heun).any() or torch.isinf(d_heun).any()):
                        d = d + effective_weight * (d_heun - d)
        else:
            if progress < correction_phase and sigma_next > 0:
                x_probe = 2 * denoised - x
                d_probe = to_d(x_probe, sigma, model(x_probe, sigma * s_in, **extra_args))
                x3 = x + ((d + d_probe) / 2) * dt
                d3 = to_d(x3, sigma, model(x3, sigma * s_in, **extra_args))
                d = (d + d3) / 2
                if torch.isnan(d).any() or torch.isinf(d).any():
                    d = torch.zeros_like(d)

        x = x + d * dt
        if sigma_next > 0:
            x = x + noise_sampler(sigma, sigma_next) * s_noise * sigma_up

    return x


@torch.no_grad()
def sample_akashic_solver(model, x, sigmas, extra_args=None, callback=None, disable=None,
                           tau=0.5, eta=1.0, s_noise=1.0, adaptive_eta=True, phase_strength=0.5,
                           order=2, smea_strength=0.0, ndb_strength=0.0,
                           use_detail_enhancement=False, settings=None, eqvae_mode='Off'):
    """
    AkashicSolver v2 [EXPERIMENTAL]: Advanced sampler optimized for EQ-VAE models.

    Combines:
    1. SA-SOLVER BASE: Multi-step Adams-Bashforth integration with tau function
    2. PHASE-AWARE SAMPLING: Three-phase approach with adaptive parameters
    3. SMEA COHERENCY: Sine-based interpolation for high-resolution coherency

    Args:
        eqvae_mode: EQ-VAE optimization mode ('Off' or 'Balanced')
    """
    extra_args = {} if extra_args is None else extra_args
    settings = settings or {}
    s_in = x.new_ones([x.shape[0]])

    if isinstance(eqvae_mode, bool):
        eqvae_enabled = eqvae_mode
    else:
        eqvae_enabled = eqvae_mode == 'Balanced'

    if eqvae_enabled:
        print(f"🌀 AkashicSolver v2 [EQ-VAE BALANCED] active")
        print(f"   Optimized for EQ-VAE's cleaner latent space")
    else:
        print(f"🌀 AkashicSolver v2 [EXPERIMENTAL] active")
    print(f"   τ (tau): {tau:.2f}, η (eta): {eta:.2f}, s_noise: {s_noise:.2f}")
    print(f"   Order: {order}, Adaptive Eta: {adaptive_eta}, Phase Strength: {phase_strength:.2f}")
    if smea_strength > 0:
        print(f"   SMEA: {smea_strength:.2f} (high-res coherency)")
    if ndb_strength > 0:
        print(f"   Native Detail Boost: {ndb_strength:.2f} (detail enhancement)")
    if not eqvae_enabled:
        print(f"   ⚠️ Use external rescaleCFG (e.g., 0.7) for EQ-VAE models")
    
    active_model = model
    # use_detail_enhancement is always False from current call-sites.
    if use_detail_enhancement and TORCHVISION_AVAILABLE:
        active_model = create_detail_enhanced_model(model, x, sigmas, settings)

    noise_sampler = get_noise_sampler(x)
    total_steps = len(sigmas) - 1
    d_history = []
    
    for i in range(total_steps):
        sigma = sigmas[i]
        sigma_next = sigmas[i + 1]
        
        progress = i / max(total_steps - 1, 1)
        
        if adaptive_eta:
            if eqvae_enabled:
                current_tau = compute_eqvae_tau(progress, tau, phase_strength)
            else:
                current_tau = compute_tau_eqvae(progress, tau, phase_strength)
        else:
            current_tau = tau

        if adaptive_eta:
            if eqvae_enabled:
                if progress < 0.25:
                    current_eta = eta * (1.0 + 0.03 * phase_strength)
                elif progress < 0.55:
                    current_eta = eta * (1.0 - 0.03 * phase_strength)
                else:
                    current_eta = eta * (1.0 + 0.02 * phase_strength)
            else:
                if progress < 0.30:
                    current_eta = eta * (1.0 + 0.08 * phase_strength)
                elif progress < 0.60:
                    current_eta = eta * (1.0 - 0.05 * phase_strength)
                else:
                    current_eta = eta * (1.0 + 0.02 * phase_strength)
        else:
            current_eta = eta
        
        smea_factor = compute_smea_factor(progress, smea_strength)
        
        denoised = active_model(x, sigma * s_in, **extra_args)
        
        cfg_scale = extra_args.get('cond_scale', 1.0)
        if cfg_scale > 7.0:
            denoised = apply_dynamic_thresholding(denoised, percentile=0.995)
        
        d = to_d(x, sigma, denoised)
        
        derivative_max = torch.abs(d).max()
        sigma_adaptive_threshold = 1000.0 * (1.0 + sigma / 10.0)
        if torch.isnan(d).any() or torch.isinf(d).any() or derivative_max > sigma_adaptive_threshold:
            d = torch.clamp(d, -sigma_adaptive_threshold, sigma_adaptive_threshold)
            if torch.isnan(d).any() or torch.isinf(d).any():
                d = torch.zeros_like(d)
        
        d_history.append((sigma, d))
        if len(d_history) > order:
            d_history.pop(0)
        
        effective_tau = current_tau

        if eqvae_enabled:
            effective_s_noise = compute_eqvae_noise_scale(s_noise * current_eta, progress) * smea_factor
        else:
            effective_s_noise = s_noise * current_eta * smea_factor

            if progress < 0.30:
                noise_multiplier = 1.0 + 0.03 * phase_strength
            elif progress < 0.60:
                noise_multiplier = 1.0 - 0.01 * phase_strength
            else:
                noise_multiplier = 1.0 - 0.02 * phase_strength

            effective_s_noise *= noise_multiplier

        if eqvae_enabled and ndb_strength > 0:
            eqvae_blur_sigma, _ = compute_eqvae_ndb(progress, ndb_strength)
        else:
            eqvae_blur_sigma = None

        x, sigma_up = sa_solver_step(
            x=x,
            d_history=d_history,
            sigma=sigma,
            sigma_next=sigma_next,
            tau=effective_tau,
            s_noise=effective_s_noise,
            noise_sampler=noise_sampler,
            order=order,
            ndb_strength=ndb_strength,
            progress=progress,
            eqvae_mode=eqvae_enabled,
            eqvae_blur_sigma=eqvae_blur_sigma
        )
        
        if torch.isnan(x).any() or torch.isinf(x).any():
            print(f"❌ AkashicSolver v2: NaN/Inf detected at step {i}/{total_steps}!")
            
            if i == 0:
                raise RuntimeError("NaN/Inf on first step - check model/inputs")
            
            print("   Attempting recovery...")
            denoised_safe = active_model(x, sigma * s_in, **extra_args)
            if torch.isnan(denoised_safe).any():
                raise RuntimeError("Model producing NaN - reduce CFG scale or check model")
            
            d_safe = to_d(x, sigma, denoised_safe)
            dt_safe = (sigma_next - sigma) * 0.5
            x = x + d_safe * dt_safe
            
            d_history.clear()
            print("   Recovery successful. Multi-step history cleared.")
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigmas[i], 'denoised': denoised})
    
    return x


# ============================================================================
# ============================================================================
# ============================================================================
# This file continues from PART1 + PART1B
# ============================================================================

# ============================================================================
# WEIGHT PATCHER (from v3 - unchanged)
# ============================================================================

def should_patch_weights(unet_model, scale, shift):
    """Return True if weight patching is actually needed for these parameters."""
    return (
        unet_model is not None and
        (abs(scale - 1.0) > 1e-6 or abs(shift) > 1e-6)
    )


class AdeptWeightPatcher:
    """Temporary weight scaling for UNet."""
    
    def __init__(self, unet_model, scale=1.0, shift=0.0):
        self.unet_model = unet_model
        self.scale = scale
        self.shift = shift
        self.backups = {}
        self.target_layers = []
    
    def __enter__(self):
        if self.unet_model is None or (abs(self.scale - 1.0) < 1e-6 and abs(self.shift) < 1e-6):
            return self
        
        self.target_layers.clear()
        self.backups.clear()
        
        try:
            for name, module in self.unet_model.named_modules():
                if isinstance(module, torch.nn.Conv2d) or isinstance(module, torch.nn.Linear):
                    if hasattr(module, 'weight') and module.weight is not None:
                        self.target_layers.append((name, module))
                        self.backups[name] = module.weight.data.clone()
                        module.weight.data = module.weight.data * self.scale + self.shift
        except Exception as e:
            print(f"❌ Weight patcher failed: {e}")
            self.__exit__(None, None, None)
        
        return self
    
    def __exit__(self, exc_type, exc_val, exc_tb):
        try:
            for name, module in self.target_layers:
                if name in self.backups:
                    module.weight.data.copy_(self.backups[name])
            self.backups.clear()
            self.target_layers.clear()
        except Exception as e:
            print(f"❌ CRITICAL: Failed to restore weights: {e}")
            for name, backup_data in self.backups.items():
                try:
                    for n, m in self.target_layers:
                        if n == name:
                            m.weight.data.copy_(backup_data)
                except:
                    pass
        
        return False


# ============================================================================
# VAE REFLECTION PATCHER (from v3 - unchanged)
# ============================================================================

class VAEReflectionPatcher:
    """Context manager for VAE reflection padding."""
    
    def __init__(self, vae_model):
        self.vae_model = vae_model
        self.backups = {}
    
    def __enter__(self):
        global _vae_reflection_active, _vae_original_padding_modes
        
        if _vae_reflection_active or self.vae_model is None:
            return self
        
        _vae_original_padding_modes.clear()
        patched_count = 0
        
        try:
            for name, module in self.vae_model.named_modules():
                if isinstance(module, torch.nn.Conv2d):
                    _vae_original_padding_modes[name] = module.padding_mode
                    module.padding_mode = 'reflect'
                    patched_count += 1
            
            _vae_reflection_active = True
            print(f"🪞 VAE Reflection: Patched {patched_count} Conv2d layers")
        except Exception as e:
            print(f"❌ VAE Reflection failed: {e}")
            self.__exit__(None, None, None)
        
        return self
    
    def __exit__(self, exc_type, exc_val, exc_tb):
        global _vae_reflection_active, _vae_original_padding_modes
        
        if self.vae_model is None:
            _vae_reflection_active = False
            _vae_original_padding_modes.clear()
            return False
        
        restored_count = 0
        try:
            for name, module in self.vae_model.named_modules():
                if isinstance(module, torch.nn.Conv2d) and name in _vae_original_padding_modes:
                    module.padding_mode = _vae_original_padding_modes[name]
                    restored_count += 1
            
            _vae_reflection_active = False
            _vae_original_padding_modes.clear()
            print(f"🔄 VAE Reflection: Restored {restored_count} layers")
        except Exception as e:
            print(f"⚠️ VAE Reflection restore warning: {e}")
        
        return False


def force_restore_vae_reflection():
    """
    Emergency / unload-path restore for VAE padding modes.
    Safe to call at any time — does nothing if VAE reflection was not active.
    """
    global _vae_reflection_active, _vae_original_padding_modes
    if not _vae_reflection_active and not _vae_original_padding_modes:
        return
    try:
        sd = getattr(shared, "sd_model", None)
        vae = getattr(sd, "first_stage_model", None) if sd else None
        if vae is not None:
            restored = 0
            for name, module in vae.named_modules():
                if isinstance(module, torch.nn.Conv2d) and name in _vae_original_padding_modes:
                    module.padding_mode = _vae_original_padding_modes[name]
                    restored += 1
            if restored:
                print(f"🔄 VAE Reflection: force-restored {restored} layers")
    except Exception as e:
        print(f"⚠️ VAE Reflection force-restore warning: {e}")
    finally:
        _vae_reflection_active = False
        _vae_original_padding_modes.clear()


# ALL SCHEDULERS (18 types)
# ============================================================================

def create_aos_v_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """AOS-V (Anime-Optimized Schedule for v-prediction models)."""
    rho = 7.0
    
    p1_steps = int(num_steps * 0.2)
    p2_steps = int(num_steps * 0.6)
    
    ramp = torch.empty(num_steps, device=device, dtype=torch.float32)
    
    if p1_steps > 0:
        torch.linspace(0, 1, p1_steps, out=ramp[:p1_steps])
        ramp[:p1_steps].pow_(0.5).mul_(0.6)
    
    if p2_steps > p1_steps:
        torch.linspace(0.6, 0.9, p2_steps - p1_steps, out=ramp[p1_steps:p2_steps])
    
    if num_steps > p2_steps:
        torch.linspace(0, 1, num_steps - p2_steps, out=ramp[p2_steps:])
        ramp[p2_steps:].pow_(3).mul_(0.1).add_(0.9)
    
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    ramp.mul_(min_inv_rho - max_inv_rho).add_(max_inv_rho).pow_(rho)
    
    return torch.cat([ramp, torch.zeros(1, device=device)])


def create_aos_e_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """AOS-ε (Anime-Optimized Schedule for epsilon-prediction models)."""
    rho = 7.0
    
    p1_frac, p2_frac = 0.35, 0.7
    ramp_p1_val, ramp_p2_val = 0.4, 0.75

    p1_steps = int(num_steps * p1_frac)
    p2_steps = int(num_steps * p2_frac)

    phase1_ramp = torch.linspace(0, 1, p1_steps, device=device) ** 1.5 * ramp_p1_val
    phase2_ramp = torch.linspace(ramp_p1_val, ramp_p2_val, p2_steps - p1_steps, device=device)
    phase3_base = torch.linspace(0, 1, num_steps - p2_steps, device=device) ** 0.7
    phase3_ramp = phase3_base * (1 - ramp_p2_val) + ramp_p2_val
    
    if p1_steps == 0: phase1_ramp = torch.empty(0, device=device)
    if p2_steps - p1_steps == 0: phase2_ramp = torch.empty(0, device=device)
    if num_steps - p2_steps == 0: phase3_ramp = torch.empty(0, device=device)

    ramp = torch.cat([phase1_ramp, phase2_ramp, phase3_ramp])
    
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + ramp * (min_inv_rho - max_inv_rho)) ** rho
    
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_aos_akashic_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """AkashicAOS v2: Detail-Progressive Schedule for EQ-VAE SDXL models."""
    rho = 7.0
    
    u = torch.linspace(0, 1, num_steps, device=device)
    
    detail_power = 0.85
    u_progressive = u ** detail_power
    
    mid_boost_strength = 0.08
    mid_boost = mid_boost_strength * torch.sin(math.pi * u) * (1 - u * 0.5)
    
    u_modulated = u_progressive + mid_boost
    
    u_min, u_max = u_modulated.min(), u_modulated.max()
    if u_max - u_min > 1e-8:
        u_modulated = (u_modulated - u_min) / (u_max - u_min)
    
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + u_modulated * (min_inv_rho - max_inv_rho)) ** rho
    
    for i in range(1, len(sigmas)):
        if sigmas[i] >= sigmas[i-1]:
            sigmas[i] = sigmas[i-1] * 0.995
        max_ratio = 1.5
        if i > 0 and sigmas[i-1] / sigmas[i] > max_ratio:
            sigmas[i] = sigmas[i-1] / max_ratio
    
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_entropic_sigmas(sigma_max, sigma_min, num_steps, power=6.0, device='cpu'):
    """Entropic power schedule."""
    rho = 7.0
    
    linear_ramp = torch.linspace(0, 1, num_steps, device=device)
    power_ramp = 1 - torch.linspace(1, 0, num_steps, device=device) ** power
    
    ramp = (linear_ramp + power_ramp) / 2.0
    
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + ramp * (min_inv_rho - max_inv_rho)) ** rho
    
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_snr_optimized_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """Schedule optimized around log SNR = 0 region."""
    rho = 7.0
    
    log_snr_max = 2 * torch.log(sigma_max)
    log_snr_min = 2 * torch.log(sigma_min)
    
    t = torch.linspace(0, 1, num_steps, device=device)
    
    concentration_power = 3.0
    sigmoid_t = torch.sigmoid(concentration_power * (t - 0.5))
    
    linear_t = t
    blend_factor = 0.7
    combined_t = blend_factor * sigmoid_t + (1 - blend_factor) * linear_t
    
    log_snr = log_snr_max + combined_t * (log_snr_min - log_snr_max)
    sigmas = torch.exp(log_snr / 2)
    
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_constant_rate_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """Constant rate of distributional change."""
    rho = 7.0
    
    t = torch.linspace(0, 1, num_steps, device=device)
    corrected_t = t + 0.3 * torch.sin(math.pi * t) * (1 - t)
    
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + corrected_t * (min_inv_rho - max_inv_rho)) ** rho
    
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_adaptive_optimized_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """Adaptive schedule combining multiple strategies."""
    rho = 7.0
    
    base_t = torch.linspace(0, 1, num_steps, device=device)
    
    strategies = [
        lambda t: t,
        lambda t: t ** 0.8,
        lambda t: t + 0.2 * torch.sin(2 * math.pi * t) * (1 - t),
        lambda t: 1 / (1 + torch.exp(-3 * (t - 0.5))),
    ]
    
    weights = [0.2, 0.3, 0.2, 0.3]
    combined_t = sum(w * s(base_t) for w, s in zip(weights, strategies))
    
    if (combined_t.max() - combined_t.min()) > 1e-6:
        combined_t = (combined_t - combined_t.min()) / (combined_t.max() - combined_t.min())
    
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + combined_t * (min_inv_rho - max_inv_rho)) ** rho
    
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_cosine_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """Cosine-annealed schedule."""
    rho = 7.0
    u = torch.linspace(0, 1, num_steps, device=device)
    t = (1 - torch.cos(math.pi * u)) / 2
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + t * (min_inv_rho - max_inv_rho)) ** rho
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_logsnr_uniform_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """Uniform in log-SNR space."""
    u = torch.linspace(0, 1, num_steps, device=device)
    log_snr_max = 2 * torch.log(sigma_max)
    log_snr_min = 2 * torch.log(sigma_min)
    log_snr = log_snr_max + u * (log_snr_min - log_snr_max)
    sigmas = torch.exp(log_snr / 2)
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_tanh_midboost_sigmas(sigma_max, sigma_min, num_steps, device='cpu', k=4.0):
    """Concentrate steps near mid-range sigmas."""
    rho = 7.0
    u = torch.linspace(0, 1, num_steps, device=device)
    k_tensor = torch.tensor(k, device=device, dtype=u.dtype)
    t = 0.5 * (torch.tanh(k_tensor * (u - 0.5)) / torch.tanh(k_tensor / 2) + 1.0)
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + t * (min_inv_rho - max_inv_rho)) ** rho
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_exponential_tail_sigmas(sigma_max, sigma_min, num_steps, device='cpu', pivot=0.7, gamma=0.8, beta=5.0):
    """Faster early lock-in with extra resolution in final steps."""
    rho = 7.0
    u = torch.linspace(0, 1, num_steps, device=device)
    
    early_mask = u < pivot
    late_mask = ~early_mask
    
    t = torch.empty_like(u)
    t[early_mask] = (u[early_mask] / pivot) ** gamma * pivot
    late_u = u[late_mask]
    t[late_mask] = pivot + (1 - pivot) * (1 - torch.exp(-beta * (late_u - pivot) / (1 - pivot)))
    
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + t * (min_inv_rho - max_inv_rho)) ** rho
    
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_jittered_karras_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """Karras schedule with controlled jitter."""
    if num_steps <= 0:
        return torch.cat([sigma_max.unsqueeze(0), torch.zeros(1, device=device)])
    
    rho = 7.0
    indices = torch.arange(num_steps, device=device, dtype=torch.float32)
    denom = max(1, num_steps - 1)
    
    base = (indices + 0.5) / denom
    jitter_seed = torch.sin((indices + 1) * 2.3999632)
    jitter_strength = 0.35
    jitter = jitter_seed * jitter_strength / denom
    
    u = torch.clamp(base + jitter, 0.0, 1.0)
    
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + u * (min_inv_rho - max_inv_rho)) ** rho
    
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_stochastic_sigmas(sigma_max, sigma_min, num_steps, device='cpu', noise_type='brownian', noise_scale=0.3, base_schedule='karras'):
    """Stochastic scheduler with controlled randomness."""
    rho = 7.0
    
    # Base schedule
    if base_schedule == 'karras':
        indices = torch.arange(num_steps, device=device, dtype=torch.float32)
        u = (indices / max(1, num_steps - 1)) ** (1 / rho)
    elif base_schedule == 'cosine':
        u = torch.linspace(0, 1, num_steps, device=device)
        u = (1 - torch.cos(math.pi * u)) / 2
    else:  # uniform
        u = torch.linspace(0, 1, num_steps, device=device)
    
    # Add noise
    if noise_type == 'brownian':
        noise = torch.randn(num_steps, device=device).cumsum(0)
        noise = noise / noise.std()
    elif noise_type == 'uniform':
        noise = torch.rand(num_steps, device=device) * 2 - 1
    else:  # normal
        noise = torch.randn(num_steps, device=device)
    
    u_noisy = u + noise * noise_scale / num_steps
    u_noisy = torch.clamp(u_noisy, 0, 1)
    
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + u_noisy * (min_inv_rho - max_inv_rho)) ** rho

    # Sort the final sigmas descending so schedule is always noise→clean.
    # Sorting u_noisy descending before the transform gives wrong order
    # because the Karras mapping is monotone-decreasing in u.
    sigmas, _ = torch.sort(sigmas, descending=True)

    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_jys_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """
    JYS (Jump Your Steps) schedule using dynamically computed timestep sequences.
    Strategy: Large jumps early, dense clustering in detail region, fine steps at end.
    Ported from ComfyUI reference implementation.
    """
    # _compute_jys_timesteps returns num_steps entries + a trailing 0.
    # Strip the trailing 0 so we get exactly num_steps timesteps; the
    # explicit zeros(1) terminator is appended below.
    jys_timesteps = _compute_jys_timesteps(num_steps)
    if jys_timesteps and jys_timesteps[-1] == 0:
        jys_timesteps = jys_timesteps[:-1]

    rho = 7.0

    normalized_timesteps = [(1000 - t) / 1000.0 for t in jys_timesteps]
    t_tensor = torch.tensor(normalized_timesteps, device=device, dtype=torch.float32)

    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + t_tensor * (min_inv_rho - max_inv_rho)) ** rho

    sigmas, _ = torch.sort(sigmas, descending=True)
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def _compute_jys_timesteps(num_steps):
    """Dynamically compute optimised JYS timestep sequence (0..1000 scale)."""
    if num_steps <= 0:
        return [0]
    if num_steps == 1:
        return [1000, 0]
    elif num_steps == 2:
        return [1000, 500, 0]
    elif num_steps == 3:
        return [1000, 600, 200, 0]

    early_steps  = max(1, int(num_steps * 0.2))
    final_steps  = max(1, int(num_steps * 0.2))
    middle_steps = max(1, num_steps - early_steps - final_steps)

    early_jump_size = max(50, (1000 - 600) // early_steps)
    early_timesteps = []
    current_t = 1000
    for _ in range(early_steps):
        early_timesteps.append(int(current_t))
        current_t = max(600, current_t - early_jump_size)

    middle_timesteps = []
    structure_steps     = max(1, middle_steps // 2)
    structure_jump_size = max(10, (600 - 300) // structure_steps)
    current_t = 600
    for _ in range(structure_steps):
        middle_timesteps.append(int(current_t))
        current_t = max(300, current_t - structure_jump_size)

    detail_steps = middle_steps - structure_steps
    if detail_steps > 0:
        detail_jump_size = max(5, (300 - 200) // detail_steps)
        current_t = 300
        for _ in range(detail_steps):
            middle_timesteps.append(int(current_t))
            current_t = max(200, current_t - detail_jump_size)

    final_start     = min(middle_timesteps) if middle_timesteps else 200
    final_jump_size = max(5, final_start // final_steps)
    final_timesteps = []
    current_t = final_start
    for _ in range(final_steps):
        final_timesteps.append(int(current_t))
        current_t = max(0, current_t - final_jump_size)

    all_timesteps    = early_timesteps + middle_timesteps + final_timesteps
    unique_timesteps = list(dict.fromkeys(all_timesteps))
    unique_timesteps.sort(reverse=True)

    while len(unique_timesteps) < num_steps:
        for i in range(len(unique_timesteps) - 1):
            mid_point = (unique_timesteps[i] + unique_timesteps[i + 1]) // 2
            if mid_point not in unique_timesteps:
                unique_timesteps.insert(i + 1, mid_point)
                if len(unique_timesteps) >= num_steps:
                    break

    if len(unique_timesteps) > num_steps:
        unique_timesteps = unique_timesteps[:num_steps]

    if unique_timesteps[-1] != 0:
        unique_timesteps.append(0)

    return unique_timesteps


def create_hybrid_jys_karras_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """Hybrid: JYS mid-phase with Karras locks."""
    if num_steps <= 0:
        return torch.cat([sigma_max.unsqueeze(0), torch.zeros(1, device=device)])

    rho = 7.0

    jys_sigmas = create_jys_sigmas(sigma_max, sigma_min, num_steps, device=device)[:-1]

    indices = torch.arange(num_steps, device=device, dtype=torch.float32)
    denom = max(1, num_steps - 1)
    base = (indices + 0.5) / denom
    jitter_seed = torch.sin((indices + 1) * 2.3999632)
    jitter_strength = 0.35
    jitter = jitter_seed * jitter_strength / denom
    u = torch.clamp(base + jitter, 0.0, 1.0)

    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    karras_sigmas = (max_inv_rho + u * (min_inv_rho - max_inv_rho)) ** rho

    positions = torch.linspace(0, 1, num_steps, device=device)
    jys_weight = torch.empty_like(positions)
    early_mask = positions < 0.3
    mid_mask = (positions >= 0.3) & (positions < 0.8)
    late_mask = positions >= 0.8
    jys_weight[early_mask] = 0.2 + 0.4 * (positions[early_mask] / 0.3)
    jys_weight[mid_mask] = 0.6 + 0.3 * ((positions[mid_mask] - 0.3) / 0.5)
    jys_weight[late_mask] = 0.9
    jys_weight = jys_weight.clamp(0.2, 0.9)

    log_jys = torch.log(jys_sigmas.clamp_min(1e-6))
    log_karras = torch.log(karras_sigmas.clamp_min(1e-6))
    log_hybrid = torch.lerp(log_karras, log_jys, jys_weight)

    hybrid = torch.exp(log_hybrid)

    smoothing = 1.0 - 0.05 * (1 - positions) ** 2
    hybrid = hybrid * smoothing

    for i in range(1, hybrid.shape[0]):
        if hybrid[i] > hybrid[i - 1]:
            hybrid[i] = hybrid[i - 1] * 0.999

    return torch.cat([hybrid, torch.zeros(1, device=device)])


def create_ays_sdxl_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """AYS (Align Your Steps) optimized for SDXL."""
    
    AYS_SCHEDULES = {
        10: [1.0000, 0.8751, 0.7502, 0.6254, 0.5004, 0.3755, 0.2506, 0.1253, 0.0502, 0.0000],
        15: [1.0000, 0.9167, 0.8334, 0.7501, 0.6668, 0.5835, 0.5002, 0.4169, 0.3336, 
             0.2503, 0.1670, 0.0837, 0.0335, 0.0084, 0.0000],
        20: [1.0000, 0.9375, 0.8750, 0.8125, 0.7500, 0.6875, 0.6250, 0.5625, 0.5000,
             0.4375, 0.3750, 0.3125, 0.2500, 0.1875, 0.1250, 0.0625, 0.0313, 0.0156, 
             0.0039, 0.0000],
        25: [1.0000, 0.9500, 0.9000, 0.8500, 0.8000, 0.7500, 0.7000, 0.6500, 0.6000,
             0.5500, 0.5000, 0.4500, 0.4000, 0.3500, 0.3000, 0.2500, 0.2000, 0.1500,
             0.1000, 0.0625, 0.0391, 0.0195, 0.0098, 0.0024, 0.0000],
        30: [1.0000, 0.9583, 0.9167, 0.8750, 0.8333, 0.7917, 0.7500, 0.7083, 0.6667,
             0.6250, 0.5833, 0.5417, 0.5000, 0.4583, 0.4167, 0.3750, 0.3333, 0.2917,
             0.2500, 0.2083, 0.1667, 0.1250, 0.0833, 0.0521, 0.0326, 0.0163, 0.0081,
             0.0041, 0.0010, 0.0000],
    }
    
    if num_steps in AYS_SCHEDULES:
        normalized = torch.tensor(AYS_SCHEDULES[num_steps], device=device, dtype=torch.float32)
    else:
        available_steps = sorted(AYS_SCHEDULES.keys())
        
        if num_steps < available_steps[0]:
            ref_steps = available_steps[0]
        elif num_steps > available_steps[-1]:
            ref_steps = available_steps[-1]
        else:
            ref_steps = min([s for s in available_steps if s >= num_steps], default=available_steps[-1])
        
        ref_schedule = np.array(AYS_SCHEDULES[ref_steps])
        
        t_ref = np.linspace(0, 1, len(ref_schedule))
        t_new = np.linspace(0, 1, num_steps + 1)
        
        log_ref = np.log(ref_schedule + 1e-8)
        log_ref[-1] = log_ref[-2] - 3.0
        
        log_interp = np.interp(t_new, t_ref, log_ref)
        normalized_np = np.exp(log_interp)
        normalized_np[-1] = 0.0
        
        normalized = torch.tensor(normalized_np, device=device, dtype=torch.float32)
    
    sigma_range = sigma_max - sigma_min
    sigmas = normalized * sigma_range + sigma_min
    
    sigmas[0] = sigma_max
    sigmas[-1] = 0.0
    
    for i in range(1, len(sigmas) - 1):
        if sigmas[i] >= sigmas[i-1]:
            sigmas[i] = sigmas[i-1] * 0.999

    # Append zero-terminator so output has num_steps+1 entries like all other schedulers.
    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_aos_akashic_alt_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """
    AkashicAOS Alt: Karras-based schedule with EQ-VAE-tuned warping.
    Stronger detail-progressive bias (power=0.78) and shifted tanh crossover at t=0.55.
    Adaptive rho scales with step count for multi-step solver stability.
    """
    if num_steps <= 0:
        return torch.zeros(1, device=device)

    rho = min(11.0, max(7.0, 7.0 + 2.0 * (20.0 / max(num_steps, 10))))
    u = torch.linspace(0, 1, num_steps, device=device)

    detail_power = 0.78
    u_detail = u ** detail_power

    t_center = 0.55
    beta = 0.07
    gamma = 4.0
    crossover = beta * torch.tanh(gamma * (u - t_center))
    u_modulated = u_detail + crossover

    u_min, u_max = u_modulated.min(), u_modulated.max()
    if u_max - u_min > 1e-8:
        u_modulated = (u_modulated - u_min) / (u_max - u_min)

    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas = (max_inv_rho + u_modulated * (min_inv_rho - max_inv_rho)) ** rho

    max_ratio = 1.5
    for i in range(1, len(sigmas)):
        if sigmas[i] >= sigmas[i - 1]:
            sigmas[i] = sigmas[i - 1] * 0.995
        if sigmas[i - 1] / sigmas[i].clamp(min=1e-10) > max_ratio:
            sigmas[i] = sigmas[i - 1] / max_ratio

    return torch.cat([sigmas, torch.zeros(1, device=device)])


def create_akashic_eqflow_sigmas(sigma_max, sigma_min, num_steps, device='cpu'):
    """
    AkashicEQFlow: Robust crossover-focused log-SNR schedule for EQ-VAE models.
    Concentrates steps around the structure-to-detail transition in logSNR space,
    blended with a Karras prior. Adaptive density width + ratio slew-rate limiting.
    """
    if num_steps <= 0:
        return torch.zeros(1, device=device)

    lambda_min = -2.0 * math.log(max(float(sigma_max), 1e-10))
    lambda_max = -2.0 * math.log(max(float(sigma_min), 1e-10))
    lambda_range = max(lambda_max - lambda_min, 1e-8)

    step_factor = min(1.0, max(0.0, (num_steps - 16) / 30.0))
    lambda_center = 0.20 + 0.15 * step_factor
    u_center = (lambda_center - lambda_min) / lambda_range
    u_center = float(min(0.88, max(0.12, u_center)))

    concentration = min(3.2, max(1.35, 1.1 + num_steps / 16.0))
    base_width = min(0.30, max(0.18, 0.31 - 0.0028 * num_steps))
    width_left = base_width * 1.06
    width_right = base_width * 0.94
    detail_side_gain = 1.08 + 0.04 * step_factor

    N = 1200
    t = torch.linspace(0, 1, N, device=device)
    delta = t - u_center
    left_core = torch.exp(-((delta / width_left) ** 2) / 2.0)
    right_core = detail_side_gain * torch.exp(-((delta / width_right) ** 2) / 2.0)
    crossover_core = torch.where(delta <= 0, left_core, right_core)

    detail_floor = 0.08 * (t ** 1.4)
    composition_floor = 0.05 * ((1 - t) ** 1.7)
    density = 1.0 + concentration * crossover_core + detail_floor + composition_floor

    dt_val = 1.0 / (N - 1)
    cdf = torch.zeros(N, device=device)
    cdf[1:] = torch.cumsum((density[:-1] + density[1:]) * 0.5 * dt_val, dim=0)
    cdf = cdf / cdf[-1].clamp(min=1e-12)

    targets = torch.linspace(0, 1, num_steps, device=device)
    indices = torch.searchsorted(cdf, targets).clamp(1, N - 1)
    lo = indices - 1
    hi = indices
    frac = (targets - cdf[lo]) / (cdf[hi] - cdf[lo]).clamp(min=1e-12)
    u_steps = t[lo] + frac * (t[hi] - t[lo])

    lambdas_eqflow = lambda_min + u_steps * lambda_range

    rho = min(10.0, max(7.0, 7.0 + 1.5 * (22.0 / max(num_steps, 12))))
    u_karras = torch.linspace(0, 1, num_steps, device=device)
    min_inv_rho = sigma_min ** (1 / rho)
    max_inv_rho = sigma_max ** (1 / rho)
    sigmas_karras = (max_inv_rho + u_karras * (min_inv_rho - max_inv_rho)) ** rho
    lambdas_karras = -2.0 * torch.log(sigmas_karras.clamp(min=1e-10))

    blend_eqflow = min(0.60, max(0.35, 0.38 + num_steps / 200.0))
    lambdas = (1.0 - blend_eqflow) * lambdas_karras + blend_eqflow * lambdas_eqflow
    sigmas = torch.exp(-lambdas / 2.0)

    if num_steps >= 40:
        max_ratio = 1.50
    elif num_steps >= 28:
        max_ratio = 1.55
    elif num_steps >= 18:
        max_ratio = 1.65
    else:
        max_ratio = 1.85
    ratio_slew = 1.18
    prev_ratio = None

    sigmas[0] = sigma_max
    for i in range(1, len(sigmas)):
        if sigmas[i] >= sigmas[i - 1]:
            sigmas[i] = sigmas[i - 1] * 0.995
        ratio = float((sigmas[i - 1] / sigmas[i].clamp(min=1e-10)).item())
        ratio = min(ratio, max_ratio)
        if prev_ratio is not None:
            ratio = min(ratio, prev_ratio * ratio_slew)
            ratio = max(ratio, prev_ratio / ratio_slew)
        ratio = max(1.001, ratio)
        sigmas[i] = sigmas[i - 1] / ratio
        prev_ratio = ratio

    return torch.cat([sigmas, torch.zeros(1, device=device)])


def apply_custom_scheduler(sigmas, scheduler_type="Standard"):
    """
    Apply a custom sigma schedule.

    sigma_min uses sigmas[-2] (last non-zero step), never the zero-terminator.
    Each scheduler is invoked via a lambda so keyword args with non-standard
    defaults (e.g. Entropic's `power`) are always passed correctly.
    """
    if scheduler_type == "Standard" or len(sigmas) < 2:
        return sigmas

    sigma_max = sigmas[0]
    # Use the last non-zero sigma as sigma_min; sigmas[-1] is always 0.
    sigma_min = sigmas[-2] if len(sigmas) >= 2 else sigmas[0]
    if sigma_min <= 0:
        sigma_min = sigma_max * 1e-3
    num_steps = len(sigmas) - 1
    device    = sigmas.device

    scheduler_map = {
        "AOS-V":              lambda: create_aos_v_sigmas(sigma_max, sigma_min, num_steps, device),
        "AOS-Epsilon":        lambda: create_aos_e_sigmas(sigma_max, sigma_min, num_steps, device),
        "AkashicAOS":         lambda: create_aos_akashic_sigmas(sigma_max, sigma_min, num_steps, device),
        "Entropic":           lambda: create_entropic_sigmas(sigma_max, sigma_min, num_steps, power=6.0, device=device),
        "SNR-Optimized":      lambda: create_snr_optimized_sigmas(sigma_max, sigma_min, num_steps, device),
        "Constant-Rate":      lambda: create_constant_rate_sigmas(sigma_max, sigma_min, num_steps, device),
        "Adaptive-Optimized": lambda: create_adaptive_optimized_sigmas(sigma_max, sigma_min, num_steps, device),
        "Cosine-Annealed":    lambda: create_cosine_sigmas(sigma_max, sigma_min, num_steps, device),
        "LogSNR-Uniform":     lambda: create_logsnr_uniform_sigmas(sigma_max, sigma_min, num_steps, device),
        "Tanh Mid-Boost":     lambda: create_tanh_midboost_sigmas(sigma_max, sigma_min, num_steps, device),
        "Exponential Tail":   lambda: create_exponential_tail_sigmas(sigma_max, sigma_min, num_steps, device),
        "Jittered-Karras":    lambda: create_jittered_karras_sigmas(sigma_max, sigma_min, num_steps, device),
        "Stochastic":         lambda: create_stochastic_sigmas(sigma_max, sigma_min, num_steps, device=device),
        "JYS (Dynamic)":      lambda: create_jys_sigmas(sigma_max, sigma_min, num_steps, device),
        "Hybrid JYS-Karras":  lambda: create_hybrid_jys_karras_sigmas(sigma_max, sigma_min, num_steps, device),
        "AYS-SDXL":           lambda: create_ays_sdxl_sigmas(sigma_max, sigma_min, num_steps, device),
        "AkashicAOS Alt":     lambda: create_aos_akashic_alt_sigmas(sigma_max, sigma_min, num_steps, device),
        "AkashicEQFlow":      lambda: create_akashic_eqflow_sigmas(sigma_max, sigma_min, num_steps, device),
    }

    fn = scheduler_map.get(scheduler_type)
    if fn is not None:
        try:
            result = fn()
            if result is not None and len(result) > 1:
                return result
            print(f"⚠️ Scheduler {scheduler_type} returned empty/None, using standard")
        except Exception as e:
            print(f"⚠️ Scheduler {scheduler_type} failed: {e}, using standard")

    return sigmas


# ============================================================================
# ============================================================================
# K-DIFFUSION SAMPLERS with Custom Sampler Integration
# ============================================================================

@torch.no_grad()
def sample_adept_euler(model, x, sigmas, extra_args=None, callback=None, disable=None, s_churn=0., s_tmin=0., s_tmax=float('inf'), s_noise=1.):
    """Euler sampler with Adept weight scaling OR custom sampler."""
    
    # CUSTOM SAMPLER INTEGRATION
    if ADEPT_STATE.get('enabled', False) and ADEPT_STATE.get('use_custom_sampler', False):
        custom_type = ADEPT_STATE.get('custom_sampler', 'Akashic Solver v2')
        print(f"🌀 Redirecting to {custom_type}")
        
        # Apply scheduler to sigmas for custom samplers
        scheduler = ADEPT_STATE.get('scheduler', 'Standard')
        if scheduler != "Standard":
            sigmas = apply_custom_scheduler(sigmas, scheduler)
            print(f"   📊 Applied {scheduler} scheduler")
        
        if custom_type == "Akashic Solver v2":
            return sample_akashic_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                tau=ADEPT_STATE.get('tau', 0.5),
                eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0),
                adaptive_eta=ADEPT_STATE.get('adaptive_eta', True),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5),
                order=ADEPT_STATE.get('solver_order', 2),
                smea_strength=ADEPT_STATE.get('smea_strength', 0.0),
                ndb_strength=ADEPT_STATE.get('ndb_strength', 0.0),
                use_detail_enhancement=False,
                settings={},
                eqvae_mode=ADEPT_STATE.get('eqvae_mode', 'Off')
            )
        elif custom_type == "Adept Solver":
            return sample_adept_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                order=ADEPT_STATE.get('solver_order', 2),
                use_corrector=ADEPT_STATE.get('use_corrector', True),
                use_detail_enhancement=False,
                settings={}
            )
        elif custom_type == "Adept Ancestral Solver":
            return sample_adept_ancestral_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0),
                adaptive_eta=ADEPT_STATE.get('adaptive_eta', False),
                phase_noise=ADEPT_STATE.get('phase_noise', False),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5),
                enhanced_derivative=ADEPT_STATE.get('enhanced_derivative', False),
                use_detail_enhancement=False,
                settings={}
            )
        elif custom_type == "Mirror Correction Euler":
            return sample_mirror_correction_euler(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0),
                correction_phase=ADEPT_STATE.get('mirror_correction_phase', 0.5),
                smooth_phase=ADEPT_STATE.get('mirror_smooth_phase', False)
            )
    
    # STANDARD K-DIFFUSION MODE (from v3 - unchanged)
    if not ADEPT_STATE.get('enabled', False):
        global ORIGINAL_SAMPLERS
        if 'euler' in ORIGINAL_SAMPLERS:
            return ORIGINAL_SAMPLERS['euler'](model, x, sigmas, extra_args, callback, disable, s_churn, s_tmin, s_tmax, s_noise)
        return _basic_euler(model, x, sigmas, extra_args, callback, disable)

    # Apply custom scheduler deterministically (before the loop, not via p.sampler.model_wrap)
    _sched = ADEPT_STATE.get('scheduler', 'Standard')
    if _sched != 'Standard':
        sigmas = apply_custom_scheduler(sigmas, _sched)

    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    
    base_scale = ADEPT_STATE.get('scale', 1.0)
    shift = ADEPT_STATE.get('shift', 0.0)
    start_pct = ADEPT_STATE.get('start_pct', 0.0)
    end_pct = ADEPT_STATE.get('end_pct', 1.0)
    
    try:
        unet_model = shared.sd_model.model.diffusion_model
    except AttributeError:
        unet_model = None
    
    total_steps = len(sigmas) - 1
    
    for i in range(total_steps):
        sigma = sigmas[i]
        gamma = min(s_churn / total_steps, 2**0.5 - 1) if s_tmin <= sigma <= s_tmax else 0
        
        current_scale = compute_dynamic_scale(i, total_steps, base_scale, start_pct, end_pct)
        
        with AdeptWeightPatcher(unet_model, current_scale, shift):
            eps = torch.randn_like(x) * s_noise if gamma > 0 else 0
            sigma_hat = sigma * (gamma + 1)
            if gamma > 0:
                x = x + eps * (sigma_hat ** 2 - sigma ** 2) ** 0.5
            
            denoised = model(x, sigma_hat * s_in, **extra_args)
            d = to_d(x, sigma_hat, denoised)
            dt = sigmas[i + 1] - sigma_hat
            x = x + d * dt
            
            if callback is not None:
                callback({'x': x, 'i': i, 'sigma': sigma_hat, 'denoised': denoised})
    
    return x

def sample_adept_euler_ancestral(model, x, sigmas, extra_args=None, callback=None, 
                                  disable=None, eta=1.0, s_noise=1.0, noise_sampler=None):
    """Euler Ancestral with Adept weight scaling."""

    # CUSTOM SAMPLER INTEGRATION
    if ADEPT_STATE.get('enabled', False) and ADEPT_STATE.get('use_custom_sampler', False):
        custom_type = ADEPT_STATE.get('custom_sampler', 'Akashic Solver v2')
        print(f"🌀 Redirecting to {custom_type}")
        
        # Apply scheduler to sigmas for custom samplers
        scheduler = ADEPT_STATE.get('scheduler', 'Standard')
        if scheduler != "Standard":
            sigmas = apply_custom_scheduler(sigmas, scheduler)
            print(f"   📊 Applied {scheduler} scheduler")
        
        if custom_type == "Akashic Solver v2":
            return sample_akashic_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                tau=ADEPT_STATE.get('tau', 0.5), eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0), adaptive_eta=ADEPT_STATE.get('adaptive_eta', True),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5), order=ADEPT_STATE.get('solver_order', 2),
                smea_strength=ADEPT_STATE.get('smea_strength', 0.0), ndb_strength=ADEPT_STATE.get('ndb_strength', 0.0),
                use_detail_enhancement=False, settings={}, eqvae_mode=ADEPT_STATE.get('eqvae_mode', 'Off')
            )
        elif custom_type == "Adept Solver":
            return sample_adept_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                order=ADEPT_STATE.get('solver_order', 2), use_corrector=ADEPT_STATE.get('use_corrector', True),
                use_detail_enhancement=False, settings={}
            )
        elif custom_type == "Adept Ancestral Solver":
            return sample_adept_ancestral_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0), s_noise=ADEPT_STATE.get('s_noise', 1.0),
                adaptive_eta=ADEPT_STATE.get('adaptive_eta', False), phase_noise=ADEPT_STATE.get('phase_noise', False),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5), enhanced_derivative=ADEPT_STATE.get('enhanced_derivative', False),
                use_detail_enhancement=False, settings={}
            )
        elif custom_type == "Mirror Correction Euler":
            return sample_mirror_correction_euler(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0),
                correction_phase=ADEPT_STATE.get('mirror_correction_phase', 0.5),
                smooth_phase=ADEPT_STATE.get('mirror_smooth_phase', False)
            )
    

    
    if not ADEPT_STATE.get('enabled', False):
        global ORIGINAL_SAMPLERS
        if 'euler_ancestral' in ORIGINAL_SAMPLERS:
            return ORIGINAL_SAMPLERS['euler_ancestral'](model, x, sigmas, extra_args, callback, disable, eta, s_noise, noise_sampler)
        return _basic_euler_ancestral(model, x, sigmas, extra_args, callback, disable, eta, s_noise)
    # Apply custom scheduler deterministically (before the loop, not via p.sampler.model_wrap)
    _sched = ADEPT_STATE.get('scheduler', 'Standard')
    if _sched != 'Standard':
        sigmas = apply_custom_scheduler(sigmas, _sched)

    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    
    # Get settings
    base_scale = ADEPT_STATE.get('scale', 1.0)
    shift = ADEPT_STATE.get('shift', 0.0)
    start_pct = ADEPT_STATE.get('start_pct', 0.0)
    end_pct = ADEPT_STATE.get('end_pct', 1.0)
    use_adaptive_eta = ADEPT_STATE.get('adaptive_eta', False)
    current_eta = ADEPT_STATE.get('eta', eta)
    current_s_noise = ADEPT_STATE.get('s_noise', s_noise)
    
    # Get UNet
    try:
        unet_model = shared.sd_model.model.diffusion_model
    except AttributeError:
        unet_model = None
    
    if noise_sampler is None:
        noise_sampler = default_noise_sampler(x)
    
    total_steps = len(sigmas) - 1
    print(f"✅ Adept Euler A active: scale={base_scale:.2f}, eta={current_eta:.2f}")
    
    for i in trange(len(sigmas) - 1, disable=disable, desc="Adept Euler A"):
        sigma = sigmas[i]
        sigma_next = sigmas[i + 1]
        
        progress = i / max(total_steps, 1)
        
        # Adaptive eta
        if use_adaptive_eta:
            if progress < 0.3:
                current_eta = eta * 1.08
            elif progress < 0.7:
                current_eta = eta * 0.95
            else:
                current_eta = eta * 1.02
        else:
            current_eta = eta
        
        # Dynamic scale
        current_scale = compute_dynamic_scale(i, total_steps, base_scale, start_pct, end_pct)
        
        # Evaluate model with weight patching
        if should_patch_weights(unet_model, current_scale, shift):
            with AdeptWeightPatcher(unet_model, current_scale, shift):
                denoised = model(x, sigma * s_in, **extra_args)
        else:
            denoised = model(x, sigma * s_in, **extra_args)
        
        # Euler Ancestral step
        sigma_down, sigma_up = get_ancestral_step(sigma, sigma_next, current_eta)
        d = to_d(x, sigma, denoised)
        
        if torch.isnan(d).any() or torch.isinf(d).any():
            d = torch.nan_to_num(d, nan=0.0, posinf=1.0, neginf=-1.0)
        
        dt = sigma_down - sigma
        x = x + d * dt
        
        if sigma_up > 0:
            noise = noise_sampler(sigma, sigma_next) * current_s_noise
            x = x + noise * sigma_up
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigma, 'denoised': denoised})
    
    return x


def _basic_euler(model, x, sigmas, extra_args=None, callback=None, disable=None):
    """Fallback basic Euler (used when ORIGINAL_SAMPLERS has no 'euler' key)."""
    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    for i in trange(len(sigmas) - 1, disable=disable):
        sigma = sigmas[i]
        denoised = model(x, sigma * s_in, **extra_args)
        d = to_d(x, sigma, denoised)
        dt = sigmas[i + 1] - sigma
        x = x + d * dt
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigma, 'denoised': denoised})
    return x


def _basic_euler_ancestral(model, x, sigmas, extra_args=None, callback=None, disable=None, eta=1.0, s_noise=1.0):
    """Fallback basic Euler Ancestral."""
    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    noise_sampler = default_noise_sampler(x)
    
    for i in trange(len(sigmas) - 1, disable=disable):
        denoised = model(x, sigmas[i] * s_in, **extra_args)
        sigma_down, sigma_up = get_ancestral_step(sigmas[i], sigmas[i + 1], eta)
        d = to_d(x, sigmas[i], denoised)
        dt = sigma_down - sigmas[i]
        x = x + d * dt
        if sigma_up > 0:
            x = x + noise_sampler(sigmas[i], sigmas[i + 1]) * s_noise * sigma_up
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigmas[i], 'denoised': denoised})
    
    return x


@torch.no_grad()

def sample_adept_heun(model, x, sigmas, extra_args=None, callback=None, disable=None, s_churn=0., s_tmin=0., s_tmax=float('inf'), s_noise=1.):
    """Heun sampler with Adept weight scaling."""

    # CUSTOM SAMPLER INTEGRATION
    if ADEPT_STATE.get('enabled', False) and ADEPT_STATE.get('use_custom_sampler', False):
        custom_type = ADEPT_STATE.get('custom_sampler', 'Akashic Solver v2')
        print(f"🌀 Redirecting to {custom_type}")
        
        # Apply scheduler to sigmas for custom samplers
        scheduler = ADEPT_STATE.get('scheduler', 'Standard')
        if scheduler != "Standard":
            sigmas = apply_custom_scheduler(sigmas, scheduler)
            print(f"   📊 Applied {scheduler} scheduler")
        
        if custom_type == "Akashic Solver v2":
            return sample_akashic_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                tau=ADEPT_STATE.get('tau', 0.5), eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0), adaptive_eta=ADEPT_STATE.get('adaptive_eta', True),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5), order=ADEPT_STATE.get('solver_order', 2),
                smea_strength=ADEPT_STATE.get('smea_strength', 0.0), ndb_strength=ADEPT_STATE.get('ndb_strength', 0.0),
                use_detail_enhancement=False, settings={}, eqvae_mode=ADEPT_STATE.get('eqvae_mode', 'Off')
            )
        elif custom_type == "Adept Solver":
            return sample_adept_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                order=ADEPT_STATE.get('solver_order', 2), use_corrector=ADEPT_STATE.get('use_corrector', True),
                use_detail_enhancement=False, settings={}
            )
        elif custom_type == "Adept Ancestral Solver":
            return sample_adept_ancestral_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0), s_noise=ADEPT_STATE.get('s_noise', 1.0),
                adaptive_eta=ADEPT_STATE.get('adaptive_eta', False), phase_noise=ADEPT_STATE.get('phase_noise', False),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5), enhanced_derivative=ADEPT_STATE.get('enhanced_derivative', False),
                use_detail_enhancement=False, settings={}
            )
        elif custom_type == "Mirror Correction Euler":
            return sample_mirror_correction_euler(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0),
                correction_phase=ADEPT_STATE.get('mirror_correction_phase', 0.5),
                smooth_phase=ADEPT_STATE.get('mirror_smooth_phase', False)
            )
    

    
    if not ADEPT_STATE.get('enabled', False):
        global ORIGINAL_SAMPLERS
        if 'heun' in ORIGINAL_SAMPLERS:
            return ORIGINAL_SAMPLERS['heun'](model, x, sigmas, extra_args, callback, disable, s_churn, s_tmin, s_tmax, s_noise)
        return _basic_heun(model, x, sigmas, extra_args, callback, disable)
    # Apply custom scheduler deterministically (before the loop, not via p.sampler.model_wrap)
    _sched = ADEPT_STATE.get('scheduler', 'Standard')
    if _sched != 'Standard':
        sigmas = apply_custom_scheduler(sigmas, _sched)

    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    
    # Get settings
    base_scale = ADEPT_STATE.get('scale', 1.0)
    shift = ADEPT_STATE.get('shift', 0.0)
    start_pct = ADEPT_STATE.get('start_pct', 0.0)
    end_pct = ADEPT_STATE.get('end_pct', 1.0)
    
    # Get UNet
    try:
        unet_model = shared.sd_model.model.diffusion_model
    except AttributeError:
        unet_model = None
    
    total_steps = len(sigmas) - 1
    print(f"✅ Adept Heun active: scale={base_scale:.2f}")
    
    for i in trange(len(sigmas) - 1, disable=disable, desc="Adept Heun"):
        sigma = sigmas[i]
        sigma_next = sigmas[i + 1]
        
        # Dynamic scale
        current_scale = compute_dynamic_scale(i, total_steps, base_scale, start_pct, end_pct)
        
        # First evaluation
        if should_patch_weights(unet_model, current_scale, shift):
            with AdeptWeightPatcher(unet_model, current_scale, shift):
                denoised = model(x, sigma * s_in, **extra_args)
        else:
            denoised = model(x, sigma * s_in, **extra_args)
        
        d = to_d(x, sigma, denoised)
        
        if torch.isnan(d).any() or torch.isinf(d).any():
            d = torch.nan_to_num(d, nan=0.0, posinf=1.0, neginf=-1.0)
        
        dt = sigma_next - sigma
        
        if sigma_next == 0:
            # Last step
            x = x + d * dt
        else:
            # Heun's method: two-stage
            x_2 = x + d * dt
            
            # Second evaluation
            if should_patch_weights(unet_model, current_scale, shift):
                with AdeptWeightPatcher(unet_model, current_scale, shift):
                    denoised_2 = model(x_2, sigma_next * s_in, **extra_args)
            else:
                denoised_2 = model(x_2, sigma_next * s_in, **extra_args)
            
            d_2 = to_d(x_2, sigma_next, denoised_2)
            
            if torch.isnan(d_2).any() or torch.isinf(d_2).any():
                d_2 = torch.nan_to_num(d_2, nan=0.0, posinf=1.0, neginf=-1.0)
            
            # Average
            d_prime = (d + d_2) / 2
            x = x + d_prime * dt
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigma, 'denoised': denoised})
    
    return x


def _basic_heun(model, x, sigmas, extra_args=None, callback=None, disable=None):
    """Fallback basic Heun."""
    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    
    for i in trange(len(sigmas) - 1, disable=disable):
        denoised = model(x, sigmas[i] * s_in, **extra_args)
        d = to_d(x, sigmas[i], denoised)
        dt = sigmas[i + 1] - sigmas[i]
        
        if sigmas[i + 1] == 0:
            x = x + d * dt
        else:
            x_2 = x + d * dt
            denoised_2 = model(x_2, sigmas[i + 1] * s_in, **extra_args)
            d_2 = to_d(x_2, sigmas[i + 1], denoised_2)
            d_prime = (d + d_2) / 2
            x = x + d_prime * dt
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigmas[i], 'denoised': denoised})
    
    return x


@torch.no_grad()

def sample_adept_dpmpp_2m(model, x, sigmas, extra_args=None, callback=None, disable=None):
    """DPM++ 2M sampler with Adept weight scaling."""

    # CUSTOM SAMPLER INTEGRATION
    if ADEPT_STATE.get('enabled', False) and ADEPT_STATE.get('use_custom_sampler', False):
        custom_type = ADEPT_STATE.get('custom_sampler', 'Akashic Solver v2')
        print(f"🌀 Redirecting to {custom_type}")
        
        # Apply scheduler to sigmas for custom samplers
        scheduler = ADEPT_STATE.get('scheduler', 'Standard')
        if scheduler != "Standard":
            sigmas = apply_custom_scheduler(sigmas, scheduler)
            print(f"   📊 Applied {scheduler} scheduler")
        
        if custom_type == "Akashic Solver v2":
            return sample_akashic_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                tau=ADEPT_STATE.get('tau', 0.5), eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0), adaptive_eta=ADEPT_STATE.get('adaptive_eta', True),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5), order=ADEPT_STATE.get('solver_order', 2),
                smea_strength=ADEPT_STATE.get('smea_strength', 0.0), ndb_strength=ADEPT_STATE.get('ndb_strength', 0.0),
                use_detail_enhancement=False, settings={}, eqvae_mode=ADEPT_STATE.get('eqvae_mode', 'Off')
            )
        elif custom_type == "Adept Solver":
            return sample_adept_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                order=ADEPT_STATE.get('solver_order', 2), use_corrector=ADEPT_STATE.get('use_corrector', True),
                use_detail_enhancement=False, settings={}
            )
        elif custom_type == "Adept Ancestral Solver":
            return sample_adept_ancestral_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0), s_noise=ADEPT_STATE.get('s_noise', 1.0),
                adaptive_eta=ADEPT_STATE.get('adaptive_eta', False), phase_noise=ADEPT_STATE.get('phase_noise', False),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5), enhanced_derivative=ADEPT_STATE.get('enhanced_derivative', False),
                use_detail_enhancement=False, settings={}
            )
        elif custom_type == "Mirror Correction Euler":
            return sample_mirror_correction_euler(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0),
                correction_phase=ADEPT_STATE.get('mirror_correction_phase', 0.5),
                smooth_phase=ADEPT_STATE.get('mirror_smooth_phase', False)
            )
    

    
    if not ADEPT_STATE.get('enabled', False):
        global ORIGINAL_SAMPLERS
        if 'dpmpp_2m' in ORIGINAL_SAMPLERS:
            return ORIGINAL_SAMPLERS['dpmpp_2m'](model, x, sigmas, extra_args, callback, disable)
        return _basic_dpmpp_2m(model, x, sigmas, extra_args, callback, disable)
    # Apply custom scheduler deterministically (before the loop, not via p.sampler.model_wrap)
    _sched = ADEPT_STATE.get('scheduler', 'Standard')
    if _sched != 'Standard':
        sigmas = apply_custom_scheduler(sigmas, _sched)

    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    
    # Get settings
    base_scale = ADEPT_STATE.get('scale', 1.0)
    shift = ADEPT_STATE.get('shift', 0.0)
    start_pct = ADEPT_STATE.get('start_pct', 0.0)
    end_pct = ADEPT_STATE.get('end_pct', 1.0)
    
    # Get UNet
    try:
        unet_model = shared.sd_model.model.diffusion_model
    except AttributeError:
        unet_model = None
    
    total_steps = len(sigmas) - 1
    print(f"✅ Adept DPM++ 2M active: scale={base_scale:.2f}")
    
    old_denoised = None
    
    for i in trange(len(sigmas) - 1, disable=disable, desc="Adept DPM++ 2M"):
        sigma = sigmas[i]
        sigma_next = sigmas[i + 1]
        
        # Dynamic scale
        current_scale = compute_dynamic_scale(i, total_steps, base_scale, start_pct, end_pct)
        
        # Evaluate model with weight patching
        if should_patch_weights(unet_model, current_scale, shift):
            with AdeptWeightPatcher(unet_model, current_scale, shift):
                denoised = model(x, sigma * s_in, **extra_args)
        else:
            denoised = model(x, sigma * s_in, **extra_args)
        
        # DPM++ 2M step
        t, t_next = sigma, sigma_next
        h = t_next - t
        
        if old_denoised is None or sigma_next == 0:
            # First step (Euler)
            x = (sigma_next / sigma) * x - (-h).expm1() * denoised
        else:
            # Second order
            h_last = t - sigmas[i - 1]
            r = h_last / h
            denoised_d = (1 + 1 / (2 * r)) * denoised - (1 / (2 * r)) * old_denoised
            x = (sigma_next / sigma) * x - (-h).expm1() * denoised_d
        
        old_denoised = denoised
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigma, 'denoised': denoised})
    
    return x


def _basic_dpmpp_2m(model, x, sigmas, extra_args=None, callback=None, disable=None):
    """Fallback basic DPM++ 2M."""
    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    old_denoised = None
    
    for i in trange(len(sigmas) - 1, disable=disable):
        denoised = model(x, sigmas[i] * s_in, **extra_args)
        t, t_next = sigmas[i], sigmas[i + 1]
        h = t_next - t
        
        if old_denoised is None or sigmas[i + 1] == 0:
            x = (t_next / t) * x - (-h).expm1() * denoised
        else:
            h_last = t - sigmas[i - 1]
            r = h_last / h
            denoised_d = (1 + 1 / (2 * r)) * denoised - (1 / (2 * r)) * old_denoised
            x = (t_next / t) * x - (-h).expm1() * denoised_d
        
        old_denoised = denoised
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigmas[i], 'denoised': denoised})
    
    return x


@torch.no_grad()

def sample_adept_dpmpp_2s_ancestral(model, x, sigmas, extra_args=None, callback=None, disable=None, eta=1.0, s_noise=1.0, noise_sampler=None):
    """DPM++ 2S Ancestral with Adept weight scaling."""

    # CUSTOM SAMPLER INTEGRATION
    if ADEPT_STATE.get('enabled', False) and ADEPT_STATE.get('use_custom_sampler', False):
        custom_type = ADEPT_STATE.get('custom_sampler', 'Akashic Solver v2')
        print(f"🌀 Redirecting to {custom_type}")
        
        # Apply scheduler to sigmas for custom samplers
        scheduler = ADEPT_STATE.get('scheduler', 'Standard')
        if scheduler != "Standard":
            sigmas = apply_custom_scheduler(sigmas, scheduler)
            print(f"   📊 Applied {scheduler} scheduler")
        
        if custom_type == "Akashic Solver v2":
            return sample_akashic_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                tau=ADEPT_STATE.get('tau', 0.5), eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0), adaptive_eta=ADEPT_STATE.get('adaptive_eta', True),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5), order=ADEPT_STATE.get('solver_order', 2),
                smea_strength=ADEPT_STATE.get('smea_strength', 0.0), ndb_strength=ADEPT_STATE.get('ndb_strength', 0.0),
                use_detail_enhancement=False, settings={}, eqvae_mode=ADEPT_STATE.get('eqvae_mode', 'Off')
            )
        elif custom_type == "Adept Solver":
            return sample_adept_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                order=ADEPT_STATE.get('solver_order', 2), use_corrector=ADEPT_STATE.get('use_corrector', True),
                use_detail_enhancement=False, settings={}
            )
        elif custom_type == "Adept Ancestral Solver":
            return sample_adept_ancestral_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0), s_noise=ADEPT_STATE.get('s_noise', 1.0),
                adaptive_eta=ADEPT_STATE.get('adaptive_eta', False), phase_noise=ADEPT_STATE.get('phase_noise', False),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5), enhanced_derivative=ADEPT_STATE.get('enhanced_derivative', False),
                use_detail_enhancement=False, settings={}
            )
        elif custom_type == "Mirror Correction Euler":
            return sample_mirror_correction_euler(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0),
                correction_phase=ADEPT_STATE.get('mirror_correction_phase', 0.5),
                smooth_phase=ADEPT_STATE.get('mirror_smooth_phase', False)
            )
    

    
    if not ADEPT_STATE.get('enabled', False):
        global ORIGINAL_SAMPLERS
        if 'dpmpp_2s_ancestral' in ORIGINAL_SAMPLERS:
            return ORIGINAL_SAMPLERS['dpmpp_2s_ancestral'](model, x, sigmas, extra_args, callback, disable, eta, s_noise, noise_sampler)
        return _basic_dpmpp_2s_ancestral(model, x, sigmas, extra_args, callback, disable, eta, s_noise)
    # Apply custom scheduler deterministically (before the loop, not via p.sampler.model_wrap)
    _sched = ADEPT_STATE.get('scheduler', 'Standard')
    if _sched != 'Standard':
        sigmas = apply_custom_scheduler(sigmas, _sched)

    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    
    # Get settings
    base_scale = ADEPT_STATE.get('scale', 1.0)
    shift = ADEPT_STATE.get('shift', 0.0)
    start_pct = ADEPT_STATE.get('start_pct', 0.0)
    end_pct = ADEPT_STATE.get('end_pct', 1.0)
    current_eta = ADEPT_STATE.get('eta', eta)
    current_s_noise = ADEPT_STATE.get('s_noise', s_noise)
    
    # Get UNet
    try:
        unet_model = shared.sd_model.model.diffusion_model
    except AttributeError:
        unet_model = None
    
    if noise_sampler is None:
        noise_sampler = default_noise_sampler(x)
    
    total_steps = len(sigmas) - 1
    print(f"✅ Adept DPM++ 2S A active: scale={base_scale:.2f}")
    
    for i in trange(len(sigmas) - 1, disable=disable, desc="Adept DPM++ 2S A"):
        sigma = sigmas[i]
        sigma_next = sigmas[i + 1]
        
        # Dynamic scale
        current_scale = compute_dynamic_scale(i, total_steps, base_scale, start_pct, end_pct)
        
        # First evaluation
        if should_patch_weights(unet_model, current_scale, shift):
            with AdeptWeightPatcher(unet_model, current_scale, shift):
                denoised = model(x, sigma * s_in, **extra_args)
        else:
            denoised = model(x, sigma * s_in, **extra_args)
        
        # DPM++ 2S step with ancestral noise
        sigma_down, sigma_up = get_ancestral_step(sigma, sigma_next, current_eta)
        
        if sigma_down == 0:
            d = to_d(x, sigma, denoised)
            x = x + d * (sigma_down - sigma)
        else:
            # Midpoint method
            t, t_next = sigma, sigma_down
            h = t_next - t
            s = t + h * 0.5
            
            # Step to midpoint
            x_mid = (s / t) * x - (-(h * 0.5)).expm1() * denoised
            
            # Evaluate at midpoint
            if should_patch_weights(unet_model, current_scale, shift):
                with AdeptWeightPatcher(unet_model, current_scale, shift):
                    denoised_mid = model(x_mid, s * s_in, **extra_args)
            else:
                denoised_mid = model(x_mid, s * s_in, **extra_args)
            
            # Full step using midpoint
            x = (t_next / t) * x - (-h).expm1() * denoised_mid
        
        # Add ancestral noise
        if sigma_up > 0:
            noise = noise_sampler(sigma, sigma_next) * current_s_noise
            x = x + noise * sigma_up
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigma, 'denoised': denoised})
    
    return x


def _basic_dpmpp_2s_ancestral(model, x, sigmas, extra_args=None, callback=None, disable=None, eta=1.0, s_noise=1.0):
    """Fallback basic DPM++ 2S Ancestral."""
    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    noise_sampler = default_noise_sampler(x)
    
    for i in trange(len(sigmas) - 1, disable=disable):
        denoised = model(x, sigmas[i] * s_in, **extra_args)
        sigma_down, sigma_up = get_ancestral_step(sigmas[i], sigmas[i + 1], eta)
        
        if sigma_down == 0:
            d = to_d(x, sigmas[i], denoised)
            x = x + d * (sigma_down - sigmas[i])
        else:
            t, t_next = sigmas[i], sigma_down
            h = t_next - t
            s = t + h * 0.5
            x_mid = (s / t) * x - (-(h * 0.5)).expm1() * denoised
            denoised_mid = model(x_mid, s * s_in, **extra_args)
            x = (t_next / t) * x - (-h).expm1() * denoised_mid
        
        if sigma_up > 0:
            x = x + noise_sampler(sigmas[i], sigmas[i + 1]) * s_noise * sigma_up
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigmas[i], 'denoised': denoised})
    
    return x


@torch.no_grad()

def sample_adept_lms(model, x, sigmas, extra_args=None, callback=None, disable=None, order=4):
    """LMS sampler with Adept weight scaling."""

    # CUSTOM SAMPLER INTEGRATION
    if ADEPT_STATE.get('enabled', False) and ADEPT_STATE.get('use_custom_sampler', False):
        custom_type = ADEPT_STATE.get('custom_sampler', 'Akashic Solver v2')
        print(f"🌀 Redirecting to {custom_type}")
        
        # Apply scheduler to sigmas for custom samplers
        scheduler = ADEPT_STATE.get('scheduler', 'Standard')
        if scheduler != "Standard":
            sigmas = apply_custom_scheduler(sigmas, scheduler)
            print(f"   📊 Applied {scheduler} scheduler")
        
        if custom_type == "Akashic Solver v2":
            return sample_akashic_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                tau=ADEPT_STATE.get('tau', 0.5), eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0), adaptive_eta=ADEPT_STATE.get('adaptive_eta', True),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5), order=ADEPT_STATE.get('solver_order', 2),
                smea_strength=ADEPT_STATE.get('smea_strength', 0.0), ndb_strength=ADEPT_STATE.get('ndb_strength', 0.0),
                use_detail_enhancement=False, settings={}, eqvae_mode=ADEPT_STATE.get('eqvae_mode', 'Off')
            )
        elif custom_type == "Adept Solver":
            return sample_adept_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                order=ADEPT_STATE.get('solver_order', 2), use_corrector=ADEPT_STATE.get('use_corrector', True),
                use_detail_enhancement=False, settings={}
            )
        elif custom_type == "Adept Ancestral Solver":
            return sample_adept_ancestral_solver(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0), s_noise=ADEPT_STATE.get('s_noise', 1.0),
                adaptive_eta=ADEPT_STATE.get('adaptive_eta', False), phase_noise=ADEPT_STATE.get('phase_noise', False),
                phase_strength=ADEPT_STATE.get('phase_strength', 0.5), enhanced_derivative=ADEPT_STATE.get('enhanced_derivative', False),
                use_detail_enhancement=False, settings={}
            )
        elif custom_type == "Mirror Correction Euler":
            return sample_mirror_correction_euler(
                model=model, x=x, sigmas=sigmas, extra_args=extra_args, callback=callback, disable=disable,
                eta=ADEPT_STATE.get('eta', 1.0),
                s_noise=ADEPT_STATE.get('s_noise', 1.0),
                correction_phase=ADEPT_STATE.get('mirror_correction_phase', 0.5),
                smooth_phase=ADEPT_STATE.get('mirror_smooth_phase', False)
            )
    

    
    if not ADEPT_STATE.get('enabled', False):
        global ORIGINAL_SAMPLERS
        if 'lms' in ORIGINAL_SAMPLERS:
            return ORIGINAL_SAMPLERS['lms'](model, x, sigmas, extra_args, callback, disable, order)
        return _basic_lms(model, x, sigmas, extra_args, callback, disable, order)
    # Apply custom scheduler deterministically (before the loop, not via p.sampler.model_wrap)
    _sched = ADEPT_STATE.get('scheduler', 'Standard')
    if _sched != 'Standard':
        sigmas = apply_custom_scheduler(sigmas, _sched)

    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    
    # Get settings
    base_scale = ADEPT_STATE.get('scale', 1.0)
    shift = ADEPT_STATE.get('shift', 0.0)
    start_pct = ADEPT_STATE.get('start_pct', 0.0)
    end_pct = ADEPT_STATE.get('end_pct', 1.0)
    
    # Get UNet
    try:
        unet_model = shared.sd_model.model.diffusion_model
    except AttributeError:
        unet_model = None
    
    total_steps = len(sigmas) - 1
    print(f"✅ Adept LMS active: scale={base_scale:.2f}, order={order}")
    
    ds = []
    
    for i in trange(len(sigmas) - 1, disable=disable, desc="Adept LMS"):
        sigma = sigmas[i]
        
        # Dynamic scale
        current_scale = compute_dynamic_scale(i, total_steps, base_scale, start_pct, end_pct)
        
        # Evaluate model with weight patching
        if should_patch_weights(unet_model, current_scale, shift):
            with AdeptWeightPatcher(unet_model, current_scale, shift):
                denoised = model(x, sigma * s_in, **extra_args)
        else:
            denoised = model(x, sigma * s_in, **extra_args)
        
        d = to_d(x, sigma, denoised)
        ds.append(d)
        
        if len(ds) > order:
            ds.pop(0)
        
        # Linear multistep coefficients
        cur_order = min(i + 1, order)
        coeffs = [1.0]
        
        for j in range(1, cur_order):
            prod = 1.0
            for k in range(cur_order):
                if k != j:
                    prod *= (sigmas[i] - sigmas[i - k]) / (sigmas[i - j] - sigmas[i - k])
            coeffs.append(prod)
        
        # Apply multistep
        d_multistep = sum(c * d_val for c, d_val in zip(coeffs, reversed(ds[-cur_order:])))
        
        dt = sigmas[i + 1] - sigma
        x = x + d_multistep * dt
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigma, 'denoised': denoised})
    
    return x


def _basic_lms(model, x, sigmas, extra_args=None, callback=None, disable=None, order=4):
    """Fallback basic LMS."""
    extra_args = {} if extra_args is None else extra_args
    s_in = x.new_ones([x.shape[0]])
    ds = []
    
    for i in trange(len(sigmas) - 1, disable=disable):
        denoised = model(x, sigmas[i] * s_in, **extra_args)
        d = to_d(x, sigmas[i], denoised)
        ds.append(d)
        
        if len(ds) > order:
            ds.pop(0)
        
        cur_order = min(i + 1, order)
        coeffs = [1.0]
        for j in range(1, cur_order):
            prod = 1.0
            for k in range(cur_order):
                if k != j:
                    prod *= (sigmas[i] - sigmas[i - k]) / (sigmas[i - j] - sigmas[i - k])
            coeffs.append(prod)
        
        d_multistep = sum(c * d_val for c, d_val in zip(coeffs, reversed(ds[-cur_order:])))
        dt = sigmas[i + 1] - sigmas[i]
        x = x + d_multistep * dt
        
        if callback is not None:
            callback({'x': x, 'i': i, 'sigma': sigmas[i], 'denoised': denoised})
    
    return x


# ============================================================================
# MONKEY PATCHING
# ============================================================================

def patch_k_diffusion():
    """Apply monkey patches to ALL k-diffusion samplers."""
    global ORIGINAL_SAMPLERS

    samplers_to_patch = {
        'sample_euler': sample_adept_euler,
        'sample_euler_ancestral': sample_adept_euler_ancestral,
        'sample_heun': sample_adept_heun,
        'sample_dpmpp_2m': sample_adept_dpmpp_2m,
        'sample_dpmpp_2s_ancestral': sample_adept_dpmpp_2s_ancestral,
        'sample_lms': sample_adept_lms,
    }

    patched_count = 0
    for original_name, adept_func in samplers_to_patch.items():
        if not hasattr(k_diffusion.sampling, original_name):
            continue
        key = original_name.replace('sample_', '')
        current_func = getattr(k_diffusion.sampling, original_name)
        # Only save original if we haven't stored it yet (avoid saving already-patched func)
        if key not in ORIGINAL_SAMPLERS:
            ORIGINAL_SAMPLERS[key] = current_func
        # Always (re-)apply our patch if it isn't already there
        if current_func is not adept_func:
            setattr(k_diffusion.sampling, original_name, adept_func)
            patched_count += 1

    print(f"✅ Adept Sampler v5: Patched {patched_count} samplers")
    print(f"   Samplers: Euler, Euler A, Heun, DPM++ 2M, DPM++ 2S A, LMS")
    print(f"   Schedulers: 18 types available")


def unpatch_k_diffusion():
    """
    Restore original k-diffusion samplers.

    Safe-unpatch strategy: before restoring we check whether the live slot
    still holds *our* wrapper.  If another extension has wrapped us on top
    (i.e. live_func is not our adept_func but also not the original we
    saved), blindly restoring would silently remove *their* wrapper too.
    In that case we skip the restore for that slot and log a warning so the
    operator knows the coexistence situation.
    """
    global ORIGINAL_SAMPLERS

    adept_wrappers = {
        'euler':                'sample_euler',
        'euler_ancestral':      'sample_euler_ancestral',
        'heun':                 'sample_heun',
        'dpmpp_2m':             'sample_dpmpp_2m',
        'dpmpp_2s_ancestral':   'sample_dpmpp_2s_ancestral',
        'lms':                  'sample_lms',
    }
    adept_funcs = {
        'euler':                sample_adept_euler,
        'euler_ancestral':      sample_adept_euler_ancestral,
        'heun':                 sample_adept_heun,
        'dpmpp_2m':             sample_adept_dpmpp_2m,
        'dpmpp_2s_ancestral':   sample_adept_dpmpp_2s_ancestral,
        'lms':                  sample_adept_lms,
    }

    restored_count  = 0
    skipped_count   = 0
    for key, attr_name in adept_wrappers.items():
        if key not in ORIGINAL_SAMPLERS:
            continue
        live_func     = getattr(k_diffusion.sampling, attr_name, None)
        our_func      = adept_funcs[key]
        saved_original = ORIGINAL_SAMPLERS[key]

        if live_func is our_func:
            # Normal case: we still own the slot — safe to restore.
            setattr(k_diffusion.sampling, attr_name, saved_original)
            restored_count += 1
        elif live_func is saved_original:
            # Already restored somehow — nothing to do.
            restored_count += 1
        else:
            # Another extension wrapped us.  Restoring would silently
            # remove their wrapper; skip and warn instead.
            print(f"⚠️ Adept unpatch: {attr_name} is currently owned by another "
                  f"extension ({live_func!r}). Skipping restore to avoid breaking "
                  f"their wrapper — you may need to reload the UI to fully unload.")
            skipped_count += 1

    ORIGINAL_SAMPLERS.clear()
    print(f"🔄 Adept Sampler: Restored {restored_count} samplers"
          + (f", skipped {skipped_count} (foreign wrappers)" if skipped_count else ""))


# ============================================================================
# A1111 EXTENSION SCRIPT
# ============================================================================

class AdeptSamplerScript(scripts.Script):
    def title(self):
        return "Adept Sampler v5"
    
    def show(self, is_img2img):
        return scripts.AlwaysVisible
    
    def ui(self, is_img2img):
        with gr.Accordion("Adept Sampler v5", open=False):
            enabled = gr.Checkbox(label="Enable Adept Sampler", value=False, elem_id="adept_enabled")
            
            with gr.Row():
                scale = gr.Slider(minimum=0.5, maximum=2.0, step=0.05, value=1.0, label="Weight Scale")
                shift = gr.Slider(minimum=-0.5, maximum=0.5, step=0.01, value=0.0, label="Weight Shift")

            with gr.Row():
                start_pct = gr.Slider(minimum=0.0, maximum=1.0, step=0.05, value=0.0, label="Start Percent")
                end_pct = gr.Slider(minimum=0.0, maximum=1.0, step=0.05, value=1.0, label="End Percent")

            gr.HTML("<p style='color: #888; font-size: 0.85em; margin: 2px 0 10px;'>"
                    "⚠️ Weight Scale / Shift / Start–End apply to the 6 patched k-diffusion samplers only. "
                    "Custom samplers (Akashic, Adept, Mirror) use their own internal parameters.</p>")
            
            with gr.Row():
                eta = gr.Slider(minimum=0.0, maximum=2.0, step=0.01, value=1.0, label="Eta (Ancestral samplers)")
                s_noise = gr.Slider(minimum=0.0, maximum=2.0, step=0.01, value=1.0, label="S-Noise")
            
            adaptive_eta = gr.Checkbox(label="Adaptive Eta (dynamic eta during sampling)", value=False)
            
            scheduler = gr.Dropdown(
                choices=["Standard", "AOS-V", "AOS-Epsilon", "AkashicAOS", "Entropic", "SNR-Optimized", 
                         "Constant-Rate", "Adaptive-Optimized", "Cosine-Annealed", "LogSNR-Uniform", 
                         "Tanh Mid-Boost", "Exponential Tail", "Jittered-Karras", "Stochastic", 
                         "JYS (Dynamic)", "Hybrid JYS-Karras", "AYS-SDXL",
                         "AkashicAOS Alt", "AkashicEQFlow"],
                value="Standard", label="Scheduler Type"
            )
            
            vae_reflection = gr.Checkbox(label="Enable VAE Reflection (fixes edge artifacts for EQ-VAE)", value=False)
            
            gr.HTML("<hr style='margin: 15px 0;'>")
            gr.HTML("<h3 style='margin: 10px 0;'>🌀 Custom Advanced Samplers</h3>")
            gr.HTML("<p style='color: #888; font-size: 0.9em;'>Enable to use Akashic/Adept/Ancestral samplers instead of k-diffusion</p>")
            
            use_custom = gr.Checkbox(label="Use Custom Sampler (overrides k-diffusion)", value=False)
            custom_type = gr.Dropdown(
                choices=["Akashic Solver v2", "Adept Solver", "Adept Ancestral Solver", "Mirror Correction Euler"],
                value="Akashic Solver v2", label="Custom Sampler Type"
            )
            
            with gr.Accordion("⚙️ Akashic Solver Settings", open=False):
                tau = gr.Slider(minimum=0.0, maximum=1.0, step=0.05, value=0.5, label="Tau (0=ODE, 1=SDE)")
                phase_strength = gr.Slider(minimum=0.0, maximum=1.0, step=0.1, value=0.5, label="Phase Strength")
                smea = gr.Slider(minimum=0.0, maximum=1.0, step=0.1, value=0.0, label="SMEA (high-res coherency)")
                ndb = gr.Slider(minimum=0.0, maximum=1.0, step=0.05, value=0.0, label="NDB (detail boost)")
                eqvae = gr.Dropdown(choices=["Off", "Balanced"], value="Off", label="EQ-VAE Mode")
            
            with gr.Accordion("⚙️ Adept Solver Settings", open=False):
                solver_order = gr.Slider(minimum=1, maximum=3, step=1, value=2, label="Order (1-3)")
                use_corrector = gr.Checkbox(value=True, label="Use Corrector")
            
            with gr.Accordion("⚙️ Ancestral Solver Settings", open=False):
                phase_noise = gr.Checkbox(value=False, label="Phase-Aware Noise")
                enhanced_deriv = gr.Checkbox(value=False, label="Enhanced Derivative")

            with gr.Accordion("⚙️ Mirror Correction Euler Settings", open=False):
                gr.HTML("<p style='color: #888; font-size: 0.9em;'>Active only when Custom Sampler = Mirror Correction Euler</p>")
                mirror_correction_phase = gr.Slider(
                    minimum=0.0, maximum=1.0, step=0.05, value=0.5,
                    label="Correction Phase (fraction of steps with 3-call Heun correction)"
                )
                mirror_smooth_phase = gr.Checkbox(
                    value=False,
                    label="Smooth Phase (log-sigma blend instead of binary cutoff)"
                )

            gr.HTML("<hr style='margin: 15px 0;'>")
            gr.HTML("<h3 style='margin: 10px 0;'>🎛️ CFG Enhancements</h3>")
            gr.HTML("<p style='color: #888; font-size: 0.9em;'>"
                    "Combat CFG Drift works in stock A1111 via official callback. "
                    "Spectral Modulation &amp; Phase-Aware CFG use a native sampler hook on "
                    "Forge/reForge-like backends, or a CFGDenoiser monkey-patch on stock A1111 "
                    "(near-parity; active mode logged to console).</p>")

            with gr.Accordion("⚙️ CFG Enhancement Settings", open=False):
                cfg_drift_enabled = gr.Checkbox(value=False, label="Enable Combat CFG Drift")
                with gr.Row():
                    cfg_drift_method = gr.Dropdown(
                        choices=["mean", "median"], value="mean",
                        label="Drift Method"
                    )
                    cfg_drift_intensity = gr.Slider(
                        minimum=0.0, maximum=1.0, step=0.05, value=0.5,
                        label="Drift Intensity"
                    )
                spectral_cfg_enabled = gr.Checkbox(
                    value=False, label="Enable Spectral Modulation (native hook or A1111 monkey-patch)"
                )
                with gr.Row():
                    spectral_multiplier = gr.Slider(
                        minimum=0.0, maximum=2.0, step=0.05, value=1.0,
                        label="Spectral Multiplier"
                    )
                    spectral_percentile = gr.Slider(
                        minimum=1.0, maximum=25.0, step=0.5, value=5.0,
                        label="Spectral Percentile"
                    )
                phase_cfg_enabled = gr.Checkbox(
                    value=False, label="Enable Phase-Aware CFG (native hook or A1111 monkey-patch)"
                )
                with gr.Row():
                    phase_cfg_alpha = gr.Slider(
                        minimum=1.1, maximum=4.0, step=0.1, value=2.0,
                        label="Phase CFG Alpha"
                    )
                    phase_cfg_beta = gr.Slider(
                        minimum=1.1, maximum=4.0, step=0.1, value=2.0,
                        label="Phase CFG Beta"
                    )

        return [enabled, scale, shift, start_pct, end_pct, eta, s_noise, adaptive_eta, scheduler, vae_reflection,
                use_custom, custom_type, tau, phase_strength, smea, ndb, eqvae, solver_order, use_corrector,
                phase_noise, enhanced_deriv,
                mirror_correction_phase, mirror_smooth_phase,
                cfg_drift_enabled, cfg_drift_method, cfg_drift_intensity,
                spectral_cfg_enabled, spectral_multiplier, spectral_percentile,
                phase_cfg_enabled, phase_cfg_alpha, phase_cfg_beta]
    
    def process(self, p, enabled, scale, shift, start_pct, end_pct, eta, s_noise, adaptive_eta, scheduler, vae_reflection,
                use_custom, custom_type, tau, phase_strength, smea, ndb, eqvae, solver_order, use_corrector,
                phase_noise, enhanced_deriv,
                mirror_correction_phase, mirror_smooth_phase,
                cfg_drift_enabled, cfg_drift_method, cfg_drift_intensity,
                spectral_cfg_enabled, spectral_multiplier, spectral_percentile,
                phase_cfg_enabled, phase_cfg_alpha, phase_cfg_beta):
        global ADEPT_STATE

        # Gate all sub-features through the master enabled switch.
        # This prevents CFG hooks, native patches, and VAE Reflection from
        # activating when the extension is globally toggled off.
        ADEPT_STATE.update({
            "enabled": enabled,
            "scale": scale,
            "shift": shift,
            "start_pct": start_pct,
            "end_pct": end_pct,
            "eta": eta,
            "s_noise": s_noise,
            "adaptive_eta": adaptive_eta,
            "scheduler": scheduler,
            "vae_reflection": enabled and vae_reflection,   # gated
            "use_custom_sampler": use_custom,
            "custom_sampler": custom_type,
            "tau": tau,
            "phase_strength": phase_strength,
            "smea_strength": smea,
            "ndb_strength": ndb,
            "eqvae_mode": eqvae,
            "solver_order": int(solver_order),
            "use_corrector": use_corrector,
            "phase_noise": phase_noise,
            "enhanced_derivative": enhanced_deriv,
            # Mirror Correction Euler
            "mirror_correction_phase": mirror_correction_phase,
            "mirror_smooth_phase": mirror_smooth_phase,
            # CFG enhancements — all gated through enabled
            "cfg_drift_enabled":    enabled and cfg_drift_enabled,
            "cfg_drift_method":     cfg_drift_method,
            "cfg_drift_intensity":  cfg_drift_intensity,
            "spectral_cfg_enabled": enabled and spectral_cfg_enabled,
            "spectral_multiplier":  spectral_multiplier,
            "spectral_percentile":  spectral_percentile,
            "phase_cfg_enabled":    enabled and phase_cfg_enabled,
            "phase_cfg_alpha":      phase_cfg_alpha,
            "phase_cfg_beta":       phase_cfg_beta,
        })

        # Scheduler is now applied inside each patched sampler function,
        # so p.sampler.model_wrap patching is no longer needed here.

        # Always reconfigure CFG runtime — even when disabled — so any previously
        # installed native hook or A1111 callbacks get cleanly removed.
        runtime_mode = configure_cfg_runtime()

        if enabled:
            info = {
                "Adept Sampler": "v5",
                "Adept Scheduler": scheduler,
                "CFG Runtime": runtime_mode,
            }
            if use_custom:
                info["Adept Custom"] = custom_type
                if custom_type == "Akashic Solver v2":
                    info["Adept Tau"] = tau
                    info["Adept EQ-VAE"] = eqvae
            p.extra_generation_params.update(info)

    def process_batch(self, p, *args, **kwargs):
        """Apply VAE Reflection before batch processing."""
        if ADEPT_STATE.get("enabled", False) and ADEPT_STATE.get("vae_reflection", False):
            try:
                vae_model = shared.sd_model.first_stage_model
                patcher = VAEReflectionPatcher(vae_model)
                patcher.__enter__()
                p.adept_vae_patcher = patcher
            except Exception as e:
                print(f"⚠️ VAE Reflection error: {e}")
    
    def postprocess_batch(self, p, *args, **kwargs):
        """Restore VAE padding modes after batch processing."""
        if hasattr(p, 'adept_vae_patcher'):
            try:
                p.adept_vae_patcher.__exit__(None, None, None)
                delattr(p, 'adept_vae_patcher')
            except Exception as e:
                print(f"⚠️ VAE Reflection restore error: {e}")
                # Safety net: force-restore even if the patcher context failed
                force_restore_vae_reflection()


# ============================================================================
# INITIALIZATION
# ============================================================================
#
# k-diffusion wrappers are installed via on_before_ui (fires after all
# extensions are imported) rather than at bare module import time.
# This reduces the risk of interacting badly with other extensions that
# also wrap k_diffusion.sampling functions, because our wrappers are put
# on last and therefore sit outermost in the call chain.
# Uninstall happens in on_script_unloaded() as before.

def _adept_deferred_init():
    patch_k_diffusion()

try:
    script_callbacks.on_before_ui(_adept_deferred_init)
except Exception:
    # Fallback: if on_before_ui isn't available (older A1111), patch immediately.
    patch_k_diffusion()

def on_script_unloaded():
    try:
        force_restore_vae_reflection()
    except Exception:
        pass
    try:
        uninstall_a1111_cfg_callbacks()
    except Exception:
        pass
    try:
        uninstall_native_cfg_hook()
    except Exception:
        pass
    try:
        unpatch_cfg_denoiser()
    except Exception:
        pass
    try:
        unpatch_k_diffusion()
    except Exception:
        pass

try:
    script_callbacks.on_script_unloaded(on_script_unloaded)
except AttributeError:
    print("⚠️ Script unload callback not available")

print("🚀 Adept Sampler v5 loaded!")
print("   ✨ 4 Custom Samplers: Akashic v2, Adept Solver, Adept Ancestral, Mirror Correction Euler")
print("   ⚡ 6 k-diffusion Samplers with weight scaling")
print("   📅 18 Schedulers (including AkashicAOS Alt, AkashicEQFlow)")
print("   🎨 VAE Reflection")
print("   ✅ A1111 port of ComfyUI-Adept-Sampler")