#!/usr/bin/env python3
"""
Heatmap of CLAP success rate: scene × distractor.

success = score(output, GT) > score(mixture, GT)  — threshold-free.

Two figures (one per model), each showing an 11 × 30 heatmap.
Cells are coloured by success rate; white = no data.
Distractors sorted by overall success rate (descending).
Scenes sorted by overall success rate (descending).
"""

from pathlib import Path

import numpy as np
import pandas as pd
import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt
import seaborn as sns

BASE_DIR = Path(__file__).parent

MODELS = {
    "combined_v1":          BASE_DIR / "experiments_final/combined_v1/eval_outputs_test_3k/event_detection_scores_gt_relative.csv",
    "no_TSDL_old_mixtures": BASE_DIR / "experiments_final/no_TSDL_old_mixtures/eval_outputs_test_3k/event_detection_scores_gt_relative.csv",
}

SUCCESS_COL = "success_clap"


def load(path: Path) -> pd.DataFrame:
    df = pd.read_csv(path)
    df = df[df["error"].isna() | (df["error"] == "")]
    df[SUCCESS_COL] = pd.to_numeric(df[SUCCESS_COL], errors="coerce")
    df["scene"] = df["mixture_id"].str.extract(r"^(.+?)_\d+dist_")
    return df


def build_pivot(df: pd.DataFrame,
                scene_order: list,
                dist_order: list) -> pd.DataFrame:
    pivot = (
        df.groupby(["scene", "distractor_name"])[SUCCESS_COL]
          .mean()
          .mul(100)
          .unstack("distractor_name")
          .reindex(index=scene_order, columns=dist_order)
    )
    return pivot


def plot_heatmap(pivot: pd.DataFrame,
                 model_name: str,
                 overall_scene: pd.Series,
                 overall_dist: pd.Series,
                 out_path: Path):
    n_scenes = len(pivot.index)
    n_dist   = len(pivot.columns)

    fig, ax = plt.subplots(figsize=(max(14, n_dist * 0.55), max(5, n_scenes * 0.55 + 2)))

    # Mask NaN cells (no data)
    mask = pivot.isna()

    sns.heatmap(
        pivot,
        ax=ax,
        mask=mask,
        annot=True,
        fmt=".0f",
        annot_kws={"size": 7},
        vmin=50, vmax=100,
        cmap="RdYlGn",
        linewidths=0.4,
        linecolor="#cccccc",
        cbar_kws={"label": "CLAP success rate (%)", "shrink": 0.6},
    )

    # Y-axis: scene + overall rate
    ylabels = [
        f"{s}  ({overall_scene.get(s, float('nan')):.1f}%)"
        for s in pivot.index
    ]
    ax.set_yticklabels(ylabels, fontsize=9, rotation=0)

    # X-axis: distractor + overall rate
    xlabels = [
        f"{d}\n({overall_dist.get(d, float('nan')):.1f}%)"
        for d in pivot.columns
    ]
    ax.set_xticklabels(xlabels, fontsize=8, rotation=45, ha="right")

    ax.set_xlabel("Distractor", fontsize=11)
    ax.set_ylabel("Scene", fontsize=11)
    ax.set_title(
        f"CLAP success rate: scene × distractor  |  {model_name}\n"
        f"success = output closer to GT than raw mixture  (no threshold)",
        fontsize=11, fontweight="bold", pad=12,
    )

    plt.tight_layout()
    fig.savefig(out_path, dpi=150, bbox_inches="tight")
    plt.close(fig)
    print(f"Saved: {out_path}")


def main():
    dfs = {name: load(path) for name, path in MODELS.items() if path.exists()}
    if not dfs:
        print("No CSVs found.")
        return

    # Compute shared distractor and scene order based on pooled success rate
    all_df = pd.concat(dfs.values(), ignore_index=True)

    dist_order = (
        all_df.groupby("distractor_name")[SUCCESS_COL]
              .mean()
              .sort_values(ascending=False)
              .index.tolist()
    )
    scene_order = (
        all_df.groupby("scene")[SUCCESS_COL]
              .mean()
              .sort_values(ascending=False)
              .index.tolist()
    )

    # Per-model plots
    for model_name, df in dfs.items():
        overall_dist = (
            df.groupby("distractor_name")[SUCCESS_COL].mean().mul(100)
        )
        overall_scene = (
            df.groupby("scene")[SUCCESS_COL].mean().mul(100)
        )

        pivot = build_pivot(df, scene_order, dist_order)
        out   = BASE_DIR / f"heatmap_scene_distractor_{model_name}.png"
        plot_heatmap(pivot, model_name, overall_scene, overall_dist, out)

    # Difference heatmap (combined_v1 − no_TSDL_old_mixtures)
    if len(dfs) == 2:
        names = list(dfs.keys())
        p0 = build_pivot(dfs[names[0]], scene_order, dist_order)
        p1 = build_pivot(dfs[names[1]], scene_order, dist_order)
        diff = p0 - p1  # positive = combined_v1 better

        fig, ax = plt.subplots(figsize=(max(14, len(dist_order) * 0.55),
                                        max(5, len(scene_order) * 0.55 + 2)))
        mask = diff.isna()
        lim  = max(abs(diff.min().min()), abs(diff.max().max()), 5)
        sns.heatmap(
            diff, ax=ax, mask=mask,
            annot=True, fmt=".1f", annot_kws={"size": 7},
            vmin=-lim, vmax=lim,
            cmap="coolwarm", center=0,
            linewidths=0.4, linecolor="#cccccc",
            cbar_kws={"label": "Δ success rate pp  (combined_v1 − no_TSDL)", "shrink": 0.6},
        )
        ax.set_yticklabels(scene_order, fontsize=9, rotation=0)
        ax.set_xticklabels(
            dist_order, fontsize=8, rotation=45, ha="right"
        )
        ax.set_xlabel("Distractor", fontsize=11)
        ax.set_ylabel("Scene", fontsize=11)
        ax.set_title(
            f"Δ CLAP success rate: {names[0]} − {names[1]}\n"
            f"Red = combined_v1 better  |  Blue = no_TSDL better",
            fontsize=11, fontweight="bold", pad=12,
        )
        plt.tight_layout()
        out = BASE_DIR / "heatmap_scene_distractor_diff.png"
        fig.savefig(out, dpi=150, bbox_inches="tight")
        plt.close(fig)
        print(f"Saved: {out}")


if __name__ == "__main__":
    main()