"""
Figure 6 style (arXiv:2409.09101) helpers for DDPM surrogate posteriors — use with ddpm_posterior_six_anchors / run_ddpm_figure6_suite.
"""

from __future__ import annotations

from pathlib import Path

import matplotlib.pyplot as plt
import numpy as np
from matplotlib import gridspec

from figure6_2409_style import (
    create_comparison_marginal_vs_profile,
    create_figure6_style_plot,
)
from sigma_contour_utils import compute_sigma_levels


def integrate_figure6_with_ddpm2(
    Wmap: np.ndarray,
    om_grid: np.ndarray,
    s8_grid: np.ndarray,
    true_om: float,
    true_s8: float,
    test_index: int,
    output_dir: Path,
    model_name: str = "DDPM-2",
) -> None:
    """Single-map Figure 6 style: marginal and profile PNGs."""
    output_dir = Path(output_dir)
    output_dir.mkdir(parents=True, exist_ok=True)
    nm = model_name.replace(" ", "-").lower()

    fig_marginal = create_figure6_style_plot(
        Wmap,
        om_grid,
        s8_grid,
        true_param1=true_om,
        true_param2=true_s8,
        param1_label=r"$\Omega_m$",
        param2_label=r"$\sigma_8$",
        title=f"{model_name} — Test ix={test_index} (Marginal)",
        show_profile=False,
        figsize=(10, 10),
    )

    save_path_marginal = output_dir / f"fig6_style_{nm}_ix{test_index}_marginal.png"
    fig_marginal.savefig(save_path_marginal, dpi=200, bbox_inches="tight")
    plt.close(fig_marginal)
    print(f"Saved: {save_path_marginal}")

    fig_profile = create_figure6_style_plot(
        Wmap,
        om_grid,
        s8_grid,
        true_param1=true_om,
        true_param2=true_s8,
        param1_label=r"$\Omega_m$",
        param2_label=r"$\sigma_8$",
        title=f"{model_name} — Test ix={test_index} (Profile)",
        show_profile=True,
        figsize=(10, 10),
    )

    save_path_profile = output_dir / f"fig6_style_{nm}_ix{test_index}_profile.png"
    fig_profile.savefig(save_path_profile, dpi=200, bbox_inches="tight")
    plt.close(fig_profile)
    print(f"Saved: {save_path_profile}")

    fig_cmp = create_comparison_marginal_vs_profile(
        Wmap,
        om_grid,
        s8_grid,
        true_param1=true_om,
        true_param2=true_s8,
        title=f"{model_name} marginal vs profile — ix={test_index}",
        figsize=(11, 4.2),
    )
    cmp_path = output_dir / f"fig6_marg_vs_prof_{nm}_ix{test_index}.png"
    fig_cmp.savefig(cmp_path, dpi=185, bbox_inches="tight")
    plt.close(fig_cmp)
    print(f"Saved: {cmp_path}")


def integrate_figure6_with_multi_anchor(
    posteriors_list: list[np.ndarray],
    om_grid: np.ndarray,
    s8_grid: np.ndarray,
    true_values_list: list[tuple[float, float]],
    test_indices: list[int],
    output_dir: Path,
    model_name: str = "DDPM-2",
) -> None:
    """2×3 grid with Figure–6-ish 2D + top marginal."""
    output_dir = Path(output_dir)
    nm = model_name.replace(" ", "-").lower()
    fig = plt.figure(figsize=(20, 14))
    gs_o = gridspec.GridSpec(2, 3, figure=fig, hspace=0.33, wspace=0.32)

    for idx, (posterior, true_vals, test_ix) in enumerate(
        zip(posteriors_list, true_values_list, test_indices)
    ):
        true_om, true_s8 = true_vals
        row, col = divmod(idx, 3)

        posterior_norm = posterior / posterior.sum()
        sigma_levels = compute_sigma_levels(posterior_norm, [0.683, 0.954])
        P1, P2 = np.meshgrid(om_grid, s8_grid, indexing="ij")

        gs_sub = gridspec.GridSpecFromSubplotSpec(
            2,
            2,
            subplot_spec=gs_o[row, col],
            width_ratios=[4, 1],
            height_ratios=[1, 4],
            hspace=0.06,
            wspace=0.06,
        )
        ax_main = fig.add_subplot(gs_sub[1, 0])
        ax_top = fig.add_subplot(gs_sub[0, 0], sharex=ax_main)

        ax_main.contourf(P1, P2, posterior_norm, levels=20, cmap="Blues", alpha=0.85)
        if len(set(sigma_levels)) >= 1:
            ax_main.contour(
                P1,
                P2,
                posterior_norm,
                levels=sigma_levels,
                colors=["darkblue", "steelblue"],
                linewidths=[2.0, 1.5],
            )

        ax_main.scatter(true_om, true_s8, s=100, c="red", marker="x", linewidths=2.5, zorder=10)
        ax_main.set_xlim(om_grid[0], om_grid[-1])
        ax_main.set_ylim(s8_grid[0], s8_grid[-1])
        ax_main.set_xlabel(r"$\Omega_m$" if row == 1 else "", fontsize=11)
        ax_main.set_ylabel(r"$\sigma_8$" if col == 0 else "", fontsize=11)
        ax_main.set_title(f"Test ix={test_ix}", fontsize=11, pad=5)
        ax_main.grid(True, alpha=0.2)

        marginal_om = posterior_norm.sum(axis=1)
        marginal_om /= marginal_om.sum() + 1e-30
        ax_top.fill_between(
            om_grid,
            0.0,
            marginal_om,
            alpha=0.6,
            color="steelblue",
            edgecolor="steelblue",
        )
        ax_top.axvline(true_om, color="red", linestyle="--", linewidth=2)
        ax_top.set_xlim(om_grid[0], om_grid[-1])
        ax_top.set_ylim(0, marginal_om.max() * 1.1)
        ax_top.tick_params(labelbottom=False, labelsize=9)
        ax_top.set_ylabel("$P(\\Omega_m)$", fontsize=9)
        ax_top.grid(True, alpha=0.2)

        ax_side = fig.add_subplot(gs_sub[1, 1], sharey=ax_main)
        marginal_s8 = posterior_norm.sum(axis=0)
        marginal_s8 /= marginal_s8.sum() + 1e-30
        ax_side.fill_betweenx(s8_grid, 0.0, marginal_s8, alpha=0.6, color="steelblue", edgecolor="steelblue")
        ax_side.axhline(true_s8, color="red", linestyle="--", linewidth=2)
        ax_side.set_ylim(s8_grid[0], s8_grid[-1])
        ax_side.set_xlim(0, marginal_s8.max() * 1.15)
        ax_side.tick_params(labelleft=False)

    fig.suptitle(
        f"{model_name} — Figure 6 Style: Six Test Anchors",
        fontsize=15,
        y=0.995,
        fontweight="bold",
    )

    save_path = output_dir / f"fig6_style_{nm}_all_anchors.png"
    fig.savefig(save_path, dpi=200, bbox_inches="tight")
    plt.close(fig)
    print(f"Saved multi-anchor grid: {save_path}")


def integrate_figure6_model_comparison(
    posteriors_dict: dict[str, np.ndarray],
    om_grid: np.ndarray,
    s8_grid: np.ndarray,
    true_om: float,
    true_s8: float,
    test_index: int,
    output_dir: Path,
) -> None:
    """Side-by-side model comparison panels."""
    output_dir = Path(output_dir)
    n_models = len(posteriors_dict)
    fig = plt.figure(figsize=(8 * max(1, min(n_models, 4)), 8))
    gs_outer = gridspec.GridSpec(1, n_models, figure=fig, wspace=0.32)

    for idx, (model_name, posterior) in enumerate(posteriors_dict.items()):
        gs_sub = gridspec.GridSpecFromSubplotSpec(
            2,
            2,
            subplot_spec=gs_outer[0, idx],
            width_ratios=[4, 1],
            height_ratios=[1, 4],
            hspace=0.06,
            wspace=0.06,
        )
        posterior_norm = posterior / posterior.sum()
        sigma_levels = compute_sigma_levels(posterior_norm, [0.683, 0.954])
        P1, P2 = np.meshgrid(om_grid, s8_grid, indexing="ij")

        ax_main = fig.add_subplot(gs_sub[1, 0])
        ax_top = fig.add_subplot(gs_sub[0, 0], sharex=ax_main)

        ax_main.contourf(P1, P2, posterior_norm, levels=20, cmap="Blues", alpha=0.85)
        if len(set(sigma_levels)) >= 1:
            ax_main.contour(
                P1,
                P2,
                posterior_norm,
                levels=sigma_levels,
                colors=["darkblue", "steelblue"],
                linewidths=[2.5, 2.0],
            )

        ax_main.scatter(true_om, true_s8, s=120, c="red", marker="x", linewidths=3, zorder=10)
        ax_main.set_xlabel(r"$\Omega_m$", fontsize=13)
        ax_main.set_ylabel(r"$\sigma_8$", fontsize=13)
        ax_main.set_title(model_name, fontsize=13, pad=10, fontweight="bold")
        ax_main.grid(True, alpha=0.3)
        ax_main.set_xlim(om_grid[0], om_grid[-1])
        ax_main.set_ylim(s8_grid[0], s8_grid[-1])

        marginal = posterior_norm.sum(axis=1)
        marginal /= marginal.sum() + 1e-30
        ax_top.fill_between(om_grid, 0.0, marginal, alpha=0.6, color="steelblue")
        ax_top.axvline(true_om, color="red", linestyle="--", linewidth=2.5)
        ax_top.set_xlim(om_grid[0], om_grid[-1])
        ax_top.set_ylim(0, marginal.max() * 1.12)
        ax_top.tick_params(labelbottom=False)
        ax_top.grid(True, alpha=0.25)

        ax_sb = fig.add_subplot(gs_sub[1, 1], sharey=ax_main)
        marginal_s = posterior_norm.sum(axis=0)
        marginal_s /= marginal_s.sum() + 1e-30
        ax_sb.fill_betweenx(s8_grid, 0.0, marginal_s, alpha=0.6, color="steelblue")
        ax_sb.axhline(true_s8, color="red", linestyle="--", linewidth=2.5)
        ax_sb.set_ylim(s8_grid[0], s8_grid[-1])

    fig.suptitle(
        f"Model Comparison (Figure 6 Style) — Test ix={test_index}",
        fontsize=15,
        y=0.995,
        fontweight="bold",
    )

    save_path = output_dir / f"fig6_style_model_comparison_ix{test_index}.png"
    fig.savefig(save_path, dpi=200, bbox_inches="tight")
    plt.close(fig)
    print(f"Saved model comparison: {save_path}")


def print_integration_guide() -> None:
    example_integration = """
# Add imports next to posterior code:
from figure6_2409_style import create_figure6_style_plot
from ddpm_figure6_integration import (
    integrate_figure6_with_ddpm2,
    integrate_figure6_with_multi_anchor,
    integrate_figure6_model_comparison,
)
"""
    print(example_integration.strip())