app.py

"""
app.py — mocap-claude / GameMaster Mocap

Dynamic preview version with normal-standing idle preview.

Workflow:
1. Upload a single-person video.
2. Process video once: extract frames -> pose detection -> MotionBERT -> cache poses_3d.
3. Move motion-strength sliders: only rerun retarget/export preview, not the full AI mocap pipeline.
4. Export final GLB / optional FBX / TRES / RES using the final slider values.

This version fixes:
- blank custom HTML viewport by using gr.Model3D
- Checkbox .release() crash by using .change() for checkboxes
- startup preview T-pose by generating a separate static idle-preview GLB
- repeated full mocap reruns when only motion strength changes
"""

from __future__ import annotations

import importlib
import logging
import os
import shutil
import sys
import time
import traceback
from typing import Any, Dict, Optional, Tuple

try:
    from dotenv import load_dotenv

    load_dotenv()
except Exception:
    pass

import gradio as gr

APP_DIR = os.path.dirname(os.path.abspath(__file__))
if APP_DIR not in sys.path:
    sys.path.insert(0, APP_DIR)

from pipeline.frame_extractor import extract_frames
from pipeline.pose_detector import detect_poses
from pipeline.motionbert_runner import run_motionbert
from pipeline.godot_exporter import export_godot_resources
from pipeline.fbx_exporter import export_fbx_from_glb
from utils.postprocess import full_postprocess

import pipeline.glb_exporter as glb_exporter


logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s %(levelname)-8s %(message)s",
    datefmt="%H:%M:%S",
)

log = logging.getLogger(__name__)
HF_TOKEN = os.environ.get("HF_TOKEN")

OUTPUT_ROOT = os.environ.get("MOCAP_OUTPUT_ROOT", "/tmp/mocap_outputs")
os.makedirs(OUTPUT_ROOT, exist_ok=True)

_IDLE_PREVIEW_CACHE: Optional[str] = None


# ---------------------------------------------------------
# Basic helpers
# ---------------------------------------------------------

def get_template_path() -> str:
    return os.environ.get(
        "CHARACTER_TEMPLATE_PATH",
        os.path.join(APP_DIR, "assets", "character_template.glb"),
    )


def bool_to_env(value: bool) -> str:
    return "1" if bool(value) else "0"


def set_idle_env_defaults() -> None:
    """
    Defaults for both the initial static preview and the first animation frame.

    These are set only when the user has not already set the same value in
    HF Space Settings > Variables.
    """
    os.environ.setdefault("MOCAP_START_WITH_IDLE_POSE", "1")
    os.environ.setdefault("MOCAP_IDLE_ARMS_DOWN", "1")
    os.environ.setdefault("MOCAP_IDLE_TRANSITION_FRAMES", "6")
    os.environ.setdefault("MOCAP_IDLE_TORSO_UPRIGHT", "0")
    os.environ.setdefault("MOCAP_IDLE_LEGS_STRAIGHT", "0")
    os.environ.setdefault("MOCAP_IDLE_ARM_SIDE_OFFSET", "0.08")
    os.environ.setdefault("MOCAP_IDLE_LEG_SIDE_OFFSET", "0.035")


def get_initial_preview_model() -> Optional[str]:
    """
    Return a normal-standing idle GLB for the startup Model3D viewport.

    Important:
    - It does NOT overwrite assets/character_template.glb.
    - It creates /tmp/mocap_outputs/template_idle_preview.glb once.
    - If anything fails, it falls back to the raw template instead of crashing.
    """
    global _IDLE_PREVIEW_CACHE

    template = get_template_path()
    if not os.path.exists(template):
        return None

    if _IDLE_PREVIEW_CACHE and os.path.exists(_IDLE_PREVIEW_CACHE):
        return _IDLE_PREVIEW_CACHE

    set_idle_env_defaults()

    try:
        # Reload so glb_exporter sees the idle defaults/env settings.
        importlib.reload(glb_exporter)

        idle_path = os.path.join(OUTPUT_ROOT, "template_idle_preview.glb")
        glb_exporter.export_idle_preview_glb(
            template_path=template,
            output_path=idle_path,
            clear_animations=True,
        )
        if os.path.exists(idle_path):
            _IDLE_PREVIEW_CACHE = idle_path
            return idle_path
    except Exception:
        log.warning("Could not create idle preview GLB; falling back to raw template.\n%s", traceback.format_exc())

    return template


def normalize_video_input(video_input: Any) -> Optional[str]:
    if video_input is None:
        return None

    if isinstance(video_input, str):
        return video_input

    if isinstance(video_input, dict):
        for key in ("path", "name", "video"):
            value = video_input.get(key)
            if isinstance(value, str) and value:
                return value

    return None


def file_size_kb(path: Optional[str]) -> float:
    if not path:
        return 0.0
    if not os.path.exists(path):
        return 0.0
    return os.path.getsize(path) / 1024.0


def timestamped_dir(prefix: str) -> str:
    stamp = time.strftime("%Y%m%d_%H%M%S")
    unique = f"{prefix}_{stamp}_{int(time.time() * 1000) % 1000000}"
    path = os.path.join(OUTPUT_ROOT, unique)
    os.makedirs(path, exist_ok=True)
    return path


def set_motion_env(
    rotation_strength: float,
    root_motion_strength: float,
    arm_strength: float,
    leg_strength: float,
    torso_strength: float,
    head_strength: float,
    hand_foot_strength: float,
    limit_multiplier: float,
    animate_hips: bool,
    disable_rotation_limits: bool,
) -> None:
    """
    pipeline/glb_exporter.py reads these variables at import time.
    Therefore, after setting these, we reload glb_exporter before exporting.
    """
    set_idle_env_defaults()

    os.environ["MOCAP_ROTATION_STRENGTH"] = str(float(rotation_strength))
    os.environ["MOCAP_ROOT_MOTION_STRENGTH"] = str(float(root_motion_strength))
    os.environ["MOCAP_ARM_STRENGTH"] = str(float(arm_strength))
    os.environ["MOCAP_LEG_STRENGTH"] = str(float(leg_strength))
    os.environ["MOCAP_TORSO_STRENGTH"] = str(float(torso_strength))
    os.environ["MOCAP_HEAD_STRENGTH"] = str(float(head_strength))
    os.environ["MOCAP_HAND_FOOT_STRENGTH"] = str(float(hand_foot_strength))
    os.environ["MOCAP_LIMIT_MULTIPLIER"] = str(float(limit_multiplier))
    os.environ["MOCAP_ANIMATE_HIPS"] = bool_to_env(animate_hips)
    os.environ["MOCAP_DISABLE_ROTATION_LIMITS"] = bool_to_env(disable_rotation_limits)


def check_blender_available() -> str:
    blender_path = shutil.which("blender")
    if not blender_path:
        return "Blender not found. FBX export will be skipped."

    try:
        import subprocess

        result = subprocess.run(
            [blender_path, "--version"],
            capture_output=True,
            text=True,
            timeout=20,
        )
        output = result.stdout or result.stderr or ""
        first_line = output.strip().splitlines()[0] if output.strip() else "Blender found."
        return f"Blender found at {blender_path}: {first_line}"
    except Exception as exc:
        return f"Blender exists but failed to run: {exc}"


def build_motion_settings_status(
    rotation_strength: float,
    root_motion_strength: float,
    arm_strength: float,
    leg_strength: float,
    torso_strength: float,
    head_strength: float,
    hand_foot_strength: float,
    limit_multiplier: float,
    animate_hips: bool,
    disable_rotation_limits: bool,
) -> str:
    lines = [
        "### Current motion settings",
        "",
        f"- Global rotation strength: {float(rotation_strength):.2f}",
        f"- Root/body motion strength: {float(root_motion_strength):.2f}",
        f"- Arm strength: {float(arm_strength):.2f}",
        f"- Leg strength: {float(leg_strength):.2f}",
        f"- Torso strength: {float(torso_strength):.2f}",
        f"- Head strength: {float(head_strength):.2f}",
        f"- Hand/foot strength: {float(hand_foot_strength):.2f}",
        f"- Rotation limit multiplier: {float(limit_multiplier):.2f}",
        f"- Animate hips/pelvis: {bool(animate_hips)}",
        f"- Disable rotation limits: {bool(disable_rotation_limits)}",
        f"- Start animation from idle pose: {os.environ.get('MOCAP_START_WITH_IDLE_POSE', '1')}",
        f"- Idle transition frames: {os.environ.get('MOCAP_IDLE_TRANSITION_FRAMES', '6')}",
    ]
    return "\n".join(lines)


def build_success_status(
    total_frames: int,
    fps: float,
    width: int,
    height: int,
    glb_path: str,
    fbx_path: Optional[str],
    tres_path: Optional[str],
    res_path: Optional[str],
    rotation_strength: float,
    root_motion_strength: float,
    arm_strength: float,
    leg_strength: float,
    torso_strength: float,
    head_strength: float,
    hand_foot_strength: float,
    limit_multiplier: float,
    animate_hips: bool,
    disable_rotation_limits: bool,
) -> str:
    fbx_status = "Skipped"
    if fbx_path and os.path.exists(fbx_path):
        fbx_status = f"Created, {file_size_kb(fbx_path):.1f} KB"

    tres_status = "Missing"
    if tres_path and os.path.exists(tres_path):
        tres_status = f"{file_size_kb(tres_path):.1f} KB"

    res_status = "Missing"
    if res_path and os.path.exists(res_path):
        res_status = f"{file_size_kb(res_path):.1f} KB"

    lines = [
        "## Final export complete",
        "",
        "The exported GLB uses the real rigged character from `assets/character_template.glb`.",
        "Frame 0 starts from the generated normal-standing idle pose; later frames follow the mocap deltas.",
        "",
        "### Output details",
        "",
        f"- Frames processed: {total_frames}",
        f"- FPS: {fps:.2f}",
        f"- Duration: {total_frames / max(float(fps), 1e-6):.2f} seconds",
        f"- Resolution: {width} x {height}",
        f"- Animated character GLB: {file_size_kb(glb_path):.1f} KB",
        f"- Optional FBX: {fbx_status}",
        f"- Godot `.tres`: {tres_status}",
        f"- Godot `.res`: {res_status}",
        "",
        build_motion_settings_status(
            rotation_strength=rotation_strength,
            root_motion_strength=root_motion_strength,
            arm_strength=arm_strength,
            leg_strength=leg_strength,
            torso_strength=torso_strength,
            head_strength=head_strength,
            hand_foot_strength=hand_foot_strength,
            limit_multiplier=limit_multiplier,
            animate_hips=animate_hips,
            disable_rotation_limits=disable_rotation_limits,
        ),
        "",
        "### Tuning tip",
        "",
        "If movement is too restricted, increase global rotation, arm strength, leg strength, root motion, and rotation limit multiplier.",
        "",
        "If the mesh twists or folds badly, reduce those values or turn off `Animate hips/pelvis`.",
    ]
    return "\n".join(lines)


def build_cache_status(cache: Dict[str, Any], preview_status: str) -> str:
    total_frames = int(cache.get("total_frames", 0))
    fps = float(cache.get("fps", 0.0))
    width = int(cache.get("width", 0))
    height = int(cache.get("height", 0))

    lines = [
        "## Video processed and mocap cached",
        "",
        "The expensive stages have finished once. You can now move the sliders to update only the retargeted character preview.",
        "",
        "### Cached mocap",
        "",
        f"- Frames: {total_frames}",
        f"- FPS: {fps:.2f}",
        f"- Resolution: {width} x {height}",
        "",
        preview_status,
    ]
    return "\n".join(lines)


def error_status(title: str, tb: str) -> str:
    return "\n".join(
        [
            f"## {title}",
            "",
            "```text",
            tb,
            "```",
            "",
            "Common checks:",
            "",
            "1. Make sure `assets/character_template.glb` exists.",
            "2. Make sure `pipeline/glb_exporter.py` is the idle-preview/full-motion retargeting version.",
            "3. Keep the uploaded video short and single-person.",
            "4. If only FBX fails, Blender is missing or failed. The GLB output can still work.",
        ]
    )


# ---------------------------------------------------------
# Core retarget/export helpers
# ---------------------------------------------------------

def retarget_to_preview_glb(
    poses_3d: Any,
    fps: float,
    rotation_strength: float,
    root_motion_strength: float,
    arm_strength: float,
    leg_strength: float,
    torso_strength: float,
    head_strength: float,
    hand_foot_strength: float,
    limit_multiplier: float,
    animate_hips: bool,
    disable_rotation_limits: bool,
) -> str:
    template_path = get_template_path()

    if not os.path.exists(template_path):
        raise RuntimeError(
            "Missing rigged character template: "
            + template_path
            + "\n\nThe Space must contain assets/character_template.glb."
        )

    set_motion_env(
        rotation_strength=rotation_strength,
        root_motion_strength=root_motion_strength,
        arm_strength=arm_strength,
        leg_strength=leg_strength,
        torso_strength=torso_strength,
        head_strength=head_strength,
        hand_foot_strength=hand_foot_strength,
        limit_multiplier=limit_multiplier,
        animate_hips=animate_hips,
        disable_rotation_limits=disable_rotation_limits,
    )

    importlib.reload(glb_exporter)

    preview_dir = timestamped_dir("preview")
    preview_glb = os.path.join(preview_dir, "preview_character.glb")

    glb_exporter.export_glb(
        poses_3d,
        fps,
        output_path=preview_glb,
        template_path=template_path,
    )

    if not os.path.exists(preview_glb):
        raise RuntimeError("Preview GLB was not created: " + preview_glb)

    return preview_glb


# ---------------------------------------------------------
# Gradio callback: process video once
# ---------------------------------------------------------

def process_video_once(
    video_input: Any,
    rotation_strength: float,
    root_motion_strength: float,
    arm_strength: float,
    leg_strength: float,
    torso_strength: float,
    head_strength: float,
    hand_foot_strength: float,
    limit_multiplier: float,
    animate_hips: bool,
    disable_rotation_limits: bool,
    smooth_sigma: float,
    progress: gr.Progress = gr.Progress(track_tqdm=True),
) -> Tuple[
    Optional[Dict[str, Any]],
    Optional[str],
    Optional[str],
    str,
]:
    video_path = normalize_video_input(video_input)

    if not video_path:
        return None, get_initial_preview_model(), None, "Please upload a video first."

    try:
        template_path = get_template_path()
        if not os.path.exists(template_path):
            raise RuntimeError(
                "Missing rigged character template: "
                + template_path
                + "\n\nThe Space must contain assets/character_template.glb."
            )

        progress(0.00, desc="Extracting frames")
        frames, fps = extract_frames(
            video_path,
            progress_cb=lambda f: progress(f * 0.07, desc="Extracting frames"),
        )

        if not frames:
            raise RuntimeError("No frames were extracted from the uploaded video.")

        total_frames = len(frames)
        width = frames[0].width
        height = frames[0].height

        log.info("Frames: %d @ %.2f fps, %dx%d", total_frames, fps, width, height)

        progress(0.07, desc="Detecting 2D pose")
        coco_kps = detect_poses(
            frames,
            hf_token=HF_TOKEN,
            progress_cb=lambda f: progress(0.07 + f * 0.35, desc="Detecting 2D pose"),
        )

        progress(0.42, desc="Running MotionBERT")
        poses_3d = run_motionbert(
            coco_kps,
            img_w=width,
            img_h=height,
            progress_cb=lambda f: progress(0.42 + f * 0.28, desc="Lifting to 3D"),
        )

        progress(0.70, desc="Smoothing and post-processing")
        poses_3d, fps = full_postprocess(
            poses_3d,
            fps,
            smooth_sigma=float(smooth_sigma),
            do_centre=True,
            do_floor=True,
        )

        cache = {
            "poses_3d": poses_3d,
            "fps": fps,
            "width": width,
            "height": height,
            "total_frames": total_frames,
            "smooth_sigma": float(smooth_sigma),
        }

        progress(0.86, desc="Building first preview")
        preview_glb = retarget_to_preview_glb(
            poses_3d=poses_3d,
            fps=fps,
            rotation_strength=rotation_strength,
            root_motion_strength=root_motion_strength,
            arm_strength=arm_strength,
            leg_strength=leg_strength,
            torso_strength=torso_strength,
            head_strength=head_strength,
            hand_foot_strength=hand_foot_strength,
            limit_multiplier=limit_multiplier,
            animate_hips=animate_hips,
            disable_rotation_limits=disable_rotation_limits,
        )

        progress(1.0, desc="Done")

        preview_status = "\n".join(
            [
                "### Preview updated",
                "",
                "The preview animation starts from a generated normal standing idle pose, then follows mocap deltas.",
                "",
                f"- Preview GLB: {file_size_kb(preview_glb):.1f} KB",
                "",
                build_motion_settings_status(
                    rotation_strength=rotation_strength,
                    root_motion_strength=root_motion_strength,
                    arm_strength=arm_strength,
                    leg_strength=leg_strength,
                    torso_strength=torso_strength,
                    head_strength=head_strength,
                    hand_foot_strength=hand_foot_strength,
                    limit_multiplier=limit_multiplier,
                    animate_hips=animate_hips,
                    disable_rotation_limits=disable_rotation_limits,
                ),
            ]
        )

        status = build_cache_status(cache, preview_status)
        return cache, preview_glb, preview_glb, status

    except Exception:
        tb = traceback.format_exc()
        log.error("Processing error:\n%s", tb)
        return None, get_initial_preview_model(), None, error_status("Processing error", tb)


# ---------------------------------------------------------
# Gradio callback: update preview from cached mocap
# ---------------------------------------------------------

def update_character_preview_from_cache(
    cache: Optional[Dict[str, Any]],
    rotation_strength: float,
    root_motion_strength: float,
    arm_strength: float,
    leg_strength: float,
    torso_strength: float,
    head_strength: float,
    hand_foot_strength: float,
    limit_multiplier: float,
    animate_hips: bool,
    disable_rotation_limits: bool,
) -> Tuple[Optional[str], Optional[str], str]:
    if not cache:
        return (
            get_initial_preview_model(),
            None,
            "No cached mocap data yet. Click `1. Process Video` first. The preview is showing the static normal-standing idle pose.",
        )

    try:
        poses_3d = cache["poses_3d"]
        fps = float(cache["fps"])

        preview_glb = retarget_to_preview_glb(
            poses_3d=poses_3d,
            fps=fps,
            rotation_strength=rotation_strength,
            root_motion_strength=root_motion_strength,
            arm_strength=arm_strength,
            leg_strength=leg_strength,
            torso_strength=torso_strength,
            head_strength=head_strength,
            hand_foot_strength=hand_foot_strength,
            limit_multiplier=limit_multiplier,
            animate_hips=animate_hips,
            disable_rotation_limits=disable_rotation_limits,
        )

        lines = [
            "## Preview updated",
            "",
            "Only the retarget/export step was rerun. The AI mocap pipeline was not rerun.",
            "The animation starts from normal-standing idle, then follows mocap deltas.",
            "",
            f"- Preview GLB: {file_size_kb(preview_glb):.1f} KB",
            "",
            build_motion_settings_status(
                rotation_strength=rotation_strength,
                root_motion_strength=root_motion_strength,
                arm_strength=arm_strength,
                leg_strength=leg_strength,
                torso_strength=torso_strength,
                head_strength=head_strength,
                hand_foot_strength=hand_foot_strength,
                limit_multiplier=limit_multiplier,
                animate_hips=animate_hips,
                disable_rotation_limits=disable_rotation_limits,
            ),
        ]

        return preview_glb, preview_glb, "\n".join(lines)

    except Exception:
        tb = traceback.format_exc()
        log.error("Preview error:\n%s", tb)
        return get_initial_preview_model(), None, error_status("Preview error", tb)


# ---------------------------------------------------------
# Gradio callback: export final files from cached mocap
# ---------------------------------------------------------

def export_final_from_cache(
    cache: Optional[Dict[str, Any]],
    rotation_strength: float,
    root_motion_strength: float,
    arm_strength: float,
    leg_strength: float,
    torso_strength: float,
    head_strength: float,
    hand_foot_strength: float,
    limit_multiplier: float,
    animate_hips: bool,
    disable_rotation_limits: bool,
) -> Tuple[
    Optional[str],
    Optional[str],
    Optional[str],
    Optional[str],
    str,
]:
    if not cache:
        return None, None, None, None, "No cached mocap data. Click `1. Process Video` first."

    try:
        poses_3d = cache["poses_3d"]
        fps = float(cache["fps"])
        width = int(cache.get("width", 0))
        height = int(cache.get("height", 0))
        total_frames = int(cache.get("total_frames", 0))

        template_path = get_template_path()
        if not os.path.exists(template_path):
            raise RuntimeError(
                "Missing rigged character template: "
                + template_path
                + "\n\nThe Space must contain assets/character_template.glb."
            )

        set_motion_env(
            rotation_strength=rotation_strength,
            root_motion_strength=root_motion_strength,
            arm_strength=arm_strength,
            leg_strength=leg_strength,
            torso_strength=torso_strength,
            head_strength=head_strength,
            hand_foot_strength=hand_foot_strength,
            limit_multiplier=limit_multiplier,
            animate_hips=animate_hips,
            disable_rotation_limits=disable_rotation_limits,
        )

        importlib.reload(glb_exporter)

        out_dir = timestamped_dir("final")

        glb_path = os.path.join(out_dir, "motion_capture_character.glb")
        fbx_path = os.path.join(out_dir, "motion_capture_character.fbx")

        glb_exporter.export_glb(
            poses_3d,
            fps,
            output_path=glb_path,
            template_path=template_path,
        )

        if not os.path.exists(glb_path):
            raise RuntimeError("Final GLB was not created: " + glb_path)

        try:
            maybe_fbx = export_fbx_from_glb(glb_path, fbx_path)
            if maybe_fbx and os.path.exists(maybe_fbx):
                fbx_path = maybe_fbx
            else:
                fbx_path = None
        except Exception as exc:
            log.warning("FBX export skipped or failed: %s", exc)
            fbx_path = None

        export_godot_resources(
            poses_3d,
            fps,
            output_dir=out_dir,
            anim_name="mocap",
        )

        tres_path = os.path.join(out_dir, "animation.tres")
        res_path = os.path.join(out_dir, "animation.res")

        if not os.path.exists(tres_path):
            tres_path = None

        if not os.path.exists(res_path):
            res_path = None

        status = build_success_status(
            total_frames=total_frames,
            fps=fps,
            width=width,
            height=height,
            glb_path=glb_path,
            fbx_path=fbx_path,
            tres_path=tres_path,
            res_path=res_path,
            rotation_strength=rotation_strength,
            root_motion_strength=root_motion_strength,
            arm_strength=arm_strength,
            leg_strength=leg_strength,
            torso_strength=torso_strength,
            head_strength=head_strength,
            hand_foot_strength=hand_foot_strength,
            limit_multiplier=limit_multiplier,
            animate_hips=animate_hips,
            disable_rotation_limits=disable_rotation_limits,
        )

        return glb_path, fbx_path, tres_path, res_path, status

    except Exception:
        tb = traceback.format_exc()
        log.error("Final export error:\n%s", tb)
        return None, None, None, None, error_status("Final export error", tb)


# ---------------------------------------------------------
# Static UI text
# ---------------------------------------------------------

BONE_TREE = "\n".join(
    [
        "The character template keeps its real mesh, materials, skin weights, fingers, and extra bones.",
        "",
        "The 17 animated mocap target bones are:",
        "",
        "```text",
        "Hips",
        "Spine",
        "Chest",
        "Neck",
        "Head",
        "LeftUpperArm",
        "LeftLowerArm",
        "LeftHand",
        "RightUpperArm",
        "RightLowerArm",
        "RightHand",
        "LeftUpperLeg",
        "LeftLowerLeg",
        "LeftFoot",
        "RightUpperLeg",
        "RightLowerLeg",
        "RightFoot",
        "```",
    ]
)

GODOT_USAGE = "\n".join(
    [
        "1. Import `motion_capture_character.glb` into Godot.",
        "2. Open the imported scene and play the embedded `mocap` animation.",
        "3. The separate `animation.tres` and `animation.res` files are also exported for Godot animation-library workflows.",
        "",
        "The animated GLB is usually the safest Godot output because it contains the mesh, armature, skin weights, and embedded animation together.",
        "",
        "GDScript example:",
        "",
        "```gdscript",
        "func _ready() -> void:",
        "    var player := $AnimationPlayer",
        "    player.play(\"mocap\")",
        "```",
    ]
)

BLENDER_USAGE = "\n".join(
    [
        "1. File > Import > glTF 2.0 > select `motion_capture_character.glb`.",
        "2. Select the imported armature/character.",
        "3. Open the Timeline or Dope Sheet and play the `mocap` action.",
        "4. You should see the uploaded rigged character moving.",
        "",
        "If the FBX output is missing, install Blender in the Space. The GLB output is still the primary output.",
    ]
)

DEFAULT_TUNING = "\n".join(
    [
        "Recommended starting point:",
        "",
        "- Global rotation strength: 2.35",
        "- Root/body motion strength: 2.25",
        "- Arm strength: 2.85",
        "- Leg strength: 2.55",
        "- Torso strength: 1.90",
        "- Head strength: 1.55",
        "- Hand/foot strength: 2.25",
        "- Rotation limit multiplier: 1.45",
        "- Animate hips/pelvis: enabled",
        "- Disable rotation limits: disabled",
        "- Smoothing sigma: 1.5",
        "- Start with idle pose: enabled",
        "- Idle transition frames: 6",
        "",
        "For stronger movement, increase global, arm, leg, and root strengths.",
        "",
        "For extreme motion testing:",
        "",
        "- Global rotation strength: 3.0 to 4.0",
        "- Arm strength: 3.5 to 5.0",
        "- Leg strength: 3.0 to 4.5",
        "- Root/body motion strength: 3.0",
        "- Rotation limit multiplier: 2.5",
        "",
        "If the animation waits too long in idle before moving, set MOCAP_IDLE_TRANSITION_FRAMES=1 in Space Variables.",
    ]
)


# ---------------------------------------------------------
# Gradio UI
# ---------------------------------------------------------

with gr.Blocks(title="GameMaster Mocap", theme=gr.themes.Soft()) as demo:
    mocap_cache = gr.State(None)

    gr.Markdown(
        "# GameMaster Mocap\n"
        "Upload a single-person video, process mocap once, then tune retarget strength with a live animated GLB preview."
    )

    with gr.Row():
        with gr.Column(scale=5):
            video_in = gr.Video(
                label="Input video, ideally 5 to 15 seconds",
                sources=["upload"],
                height=320,
            )

            gr.Markdown(
                "Free CPU Space note: keep clips short. Processing the video is expensive; slider preview updates reuse cached mocap data."
            )

            with gr.Accordion("Motion strength controls", open=True):
                gr.Markdown(
                    "Move a slider, then release it. The Space will rerun only retarget/export, not the full AI mocap pipeline."
                )

                rotation_strength = gr.Slider(
                    label="Global rotation strength",
                    minimum=0.1,
                    maximum=8.0,
                    value=2.35,
                    step=0.05,
                )

                root_motion_strength = gr.Slider(
                    label="Root/body motion strength",
                    minimum=0.0,
                    maximum=10.0,
                    value=2.25,
                    step=0.05,
                )

                with gr.Row():
                    arm_strength = gr.Slider(
                        label="Arm strength",
                        minimum=0.1,
                        maximum=10.0,
                        value=2.85,
                        step=0.05,
                    )
                    leg_strength = gr.Slider(
                        label="Leg strength",
                        minimum=0.1,
                        maximum=10.0,
                        value=2.55,
                        step=0.05,
                    )

                with gr.Row():
                    torso_strength = gr.Slider(
                        label="Torso strength",
                        minimum=0.1,
                        maximum=8.0,
                        value=1.90,
                        step=0.05,
                    )
                    head_strength = gr.Slider(
                        label="Head strength",
                        minimum=0.1,
                        maximum=6.0,
                        value=1.55,
                        step=0.05,
                    )

                hand_foot_strength = gr.Slider(
                    label="Hand/foot strength",
                    minimum=0.1,
                    maximum=8.0,
                    value=2.25,
                    step=0.05,
                )

                limit_multiplier = gr.Slider(
                    label="Rotation limit multiplier",
                    minimum=0.25,
                    maximum=20.0,
                    value=1.45,
                    step=0.05,
                )

                with gr.Row():
                    animate_hips = gr.Checkbox(
                        label="Animate hips/pelvis",
                        value=True,
                    )
                    disable_rotation_limits = gr.Checkbox(
                        label="Disable rotation limits — more motion, more risk",
                        value=False,
                    )

                smooth_sigma = gr.Slider(
                    label="Smoothing sigma",
                    minimum=0.0,
                    maximum=5.0,
                    value=1.5,
                    step=0.1,
                )

                with gr.Accordion("Recommended values", open=False):
                    gr.Markdown(DEFAULT_TUNING)

            with gr.Row():
                process_btn = gr.Button("1. Process Video", variant="primary", size="lg")
                update_preview_btn = gr.Button("Update Preview", variant="secondary")
                export_btn = gr.Button("2. Export Final Files", variant="secondary")

            with gr.Accordion("Animated bone target list", open=False):
                gr.Markdown(BONE_TREE)

            with gr.Accordion("Godot 4 setup", open=False):
                gr.Markdown(GODOT_USAGE)

            with gr.Accordion("Blender setup", open=False):
                gr.Markdown(BLENDER_USAGE)

        with gr.Column(scale=6):
            gr.Markdown("## Live Character Preview")

            preview_3d = gr.Model3D(
                value=get_initial_preview_model(),
                label="Live animated GLB preview",
                height=520,
            )

            preview_glb_file = gr.File(
                label="Current preview GLB",
                interactive=False,
            )

            status_md = gr.Markdown(
                "\n".join(
                    [
                        "The viewport starts with a generated normal-standing idle pose, not the raw T-pose template.",
                        "",
                        "Upload a video and click `1. Process Video`.",
                        "",
                        "First run downloads DETR, ViTPose, and MotionBERT assets if they are not cached.",
                        "",
                        check_blender_available(),
                    ]
                )
            )

            gr.Markdown("### Final downloads")

            glb_out = gr.File(
                label="motion_capture_character.glb — rigged character plus mocap animation",
                interactive=False,
            )

            fbx_out = gr.File(
                label="motion_capture_character.fbx — optional, requires Blender",
                interactive=False,
            )

            with gr.Row():
                tres_out = gr.File(
                    label="animation.tres — Godot text AnimationLibrary",
                    interactive=False,
                )
                res_out = gr.File(
                    label="animation.res — Godot binary AnimationLibrary",
                    interactive=False,
                )

    process_inputs = [
        video_in,
        rotation_strength,
        root_motion_strength,
        arm_strength,
        leg_strength,
        torso_strength,
        head_strength,
        hand_foot_strength,
        limit_multiplier,
        animate_hips,
        disable_rotation_limits,
        smooth_sigma,
    ]

    preview_inputs = [
        mocap_cache,
        rotation_strength,
        root_motion_strength,
        arm_strength,
        leg_strength,
        torso_strength,
        head_strength,
        hand_foot_strength,
        limit_multiplier,
        animate_hips,
        disable_rotation_limits,
    ]

    preview_outputs = [
        preview_3d,
        preview_glb_file,
        status_md,
    ]

    final_export_inputs = [
        mocap_cache,
        rotation_strength,
        root_motion_strength,
        arm_strength,
        leg_strength,
        torso_strength,
        head_strength,
        hand_foot_strength,
        limit_multiplier,
        animate_hips,
        disable_rotation_limits,
    ]

    process_btn.click(
        fn=process_video_once,
        inputs=process_inputs,
        outputs=[
            mocap_cache,
            preview_3d,
            preview_glb_file,
            status_md,
        ],
        show_progress="full",
    )

    update_preview_btn.click(
        fn=update_character_preview_from_cache,
        inputs=preview_inputs,
        outputs=preview_outputs,
        show_progress="minimal",
    )

    export_btn.click(
        fn=export_final_from_cache,
        inputs=final_export_inputs,
        outputs=[
            glb_out,
            fbx_out,
            tres_out,
            res_out,
            status_md,
        ],
        show_progress="full",
    )

    # ---------------------------------------------------------
    # Auto-update preview when controls change
    # ---------------------------------------------------------
    # Sliders support .release(), so preview updates after the user releases the slider.
    # Checkboxes do NOT support .release(); they must use .change().
    # This fixes:
    # AttributeError: 'Checkbox' object has no attribute 'release'
    # ---------------------------------------------------------

    slider_controls = [
        rotation_strength,
        root_motion_strength,
        arm_strength,
        leg_strength,
        torso_strength,
        head_strength,
        hand_foot_strength,
        limit_multiplier,
    ]

    for slider in slider_controls:
        slider.release(
            fn=update_character_preview_from_cache,
            inputs=preview_inputs,
            outputs=preview_outputs,
            show_progress="minimal",
        )

    checkbox_controls = [
        animate_hips,
        disable_rotation_limits,
    ]

    for checkbox in checkbox_controls:
        checkbox.change(
            fn=update_character_preview_from_cache,
            inputs=preview_inputs,
            outputs=preview_outputs,
            show_progress="minimal",
        )

    gr.Markdown(
        "---\n"
        "Uses DETR, ViTPose, and MotionBERT for pose extraction/lifting, then retargets onto the provided rigged GLB template."
    )


if __name__ == "__main__":
    set_idle_env_defaults()
    demo.launch(
        server_name="0.0.0.0",
        server_port=7860,
        share=False,
        allowed_paths=[
            OUTPUT_ROOT,
            os.path.join(APP_DIR, "assets"),
        ],
    )