"""Compare robustness curves across three models:
  CTA (this project), X-AVDT, AVH-Align.

For each perturbation type, draw one figure with three lines (one per model)
showing AUROC (and AP / Accuracy / Acc@EER) as a function of severity level.

The three input CSVs use different schemas; this script normalizes them to
a common long-table:  (model, perturbation, level, AUROC, AP, Accuracy, Acc@EER).

Output:
  <out_dir>/
    auroc_<perturbation>.{png,pdf}      one per perturbation, single metric
    ap_<perturbation>.{png,pdf}
    acc_<perturbation>.{png,pdf}
    acc_at_eer_<perturbation>.{png,pdf}
    grid_auroc.{png,pdf}                7 perturbations on one A4-ish grid
    merged_long_table.csv               normalized long-table for downstream

Usage:
  python3 scripts/analysis/plot_robustness_compare.py \\
      --cta /apdcephfs_gy4/.../figs_with_jpeg/robustness_table.csv \\
      --xavdt /apdcephfs_gy4/.../X-AVDT/results/robustness/robustness_summary.csv \\
      --avhalign /apdcephfs_gy5/.../AVH-Align/results/robustness_v2/merged_long_table.csv \\
      --out_dir /apdcephfs_gy4/.../X-AVDT/results/robustness/compare
"""
from __future__ import annotations

import argparse
import csv
import os
from collections import defaultdict
from pathlib import Path
from typing import Dict, List, Optional

import matplotlib
matplotlib.use("Agg")
import matplotlib.pyplot as plt


# ---- canonical perturbation names + display order -----------------------
PERTS_CANONICAL = [
    "gaussian_noise",
    "block_wise",
    "jpeg_quality",       # canonical name; CTA uses 'jpeg_quality',
                          # AVH-Align uses 'jpeg_compression' -> we map.
    "pixelate",
    "gaussian_blur",
    "color_saturation",
    "color_contrast",
]

# alternate spelling(s) per canonical key, used when normalizing input
PERT_ALIASES: Dict[str, str] = {
    "jpeg_compression": "jpeg_quality",
}

PRETTY = {
    "gaussian_noise":   "Gaussian noise",
    "block_wise":       "Block occlusion",
    "jpeg_quality":     "JPEG compression",
    "pixelate":         "Pixelation",
    "gaussian_blur":    "Gaussian blur",
    "color_saturation": "Color saturation",
    "color_contrast":   "Color contrast",
}

MODEL_COLORS = {
    "CTA":       "#C0392B",   # red
    "X-AVDT":    "#2980B9",   # blue
    "AVH-Align": "#16A085",   # teal
}
MODEL_MARKERS = {
    "CTA":       "o",
    "X-AVDT":    "s",
    "AVH-Align": "^",
}


def _canon(p: str) -> str:
    return PERT_ALIASES.get(p, p)


def _to_float(s: str) -> Optional[float]:
    try:
        v = float(s)
        if v != v:   # NaN
            return None
        return v
    except (ValueError, TypeError):
        return None


# ============================================================================
# Per-source loaders -> list[dict(model, perturbation, level, metrics)]
# ============================================================================
def load_cta(path: str) -> List[dict]:
    """CTA schema (long, narrow):
        perturbation,level,param,AUROC,AP,Accuracy,Acc@EER,delta_AUROC_vs_L1
    Already long-format: one row per (perturbation, level).
    """
    rows = []
    with open(path) as f:
        reader = csv.DictReader(f)
        for r in reader:
            p = _canon(r["perturbation"].strip())
            L = int(r["level"])
            rows.append({
                "model":  "CTA",
                "perturbation": p,
                "level":  L,
                "param":  r.get("param", ""),
                "AUROC":  _to_float(r.get("AUROC")),
                "AP":     _to_float(r.get("AP")),
                "Accuracy": _to_float(r.get("Accuracy")),
                "Acc@EER":  _to_float(r.get("Acc@EER")),
            })
    print(f"[load] CTA: {len(rows)} rows from {path}")
    return rows


def load_xavdt(path: str) -> List[dict]:
    """X-AVDT schema:
        perturbation,level,param,n_clips,
        overall_AUROC, overall_AP, overall_Accuracy@0.50, overall_Acc@EER,
        overall_TPR@FPR=1%, overall_TPR@FPR=0.1%, ... (per-fake too)
    Special row: perturbation='baseline', level=1  (the no-op).
    Each non-baseline perturbation only has level 2..5; we fan the baseline
    out as L1 of every perturbation so curves start at the same anchor.
    """
    rows = []
    baseline = None
    perts_seen = set()
    with open(path) as f:
        reader = csv.DictReader(f)
        for r in reader:
            p_raw = r["perturbation"].strip()
            L = int(r["level"])
            block = {
                "AUROC":   _to_float(r.get("overall_AUROC")),
                "AP":      _to_float(r.get("overall_AP")),
                "Accuracy": _to_float(r.get("overall_Accuracy@0.50")),
                "Acc@EER":  _to_float(r.get("overall_Acc@EER")),
            }
            if p_raw == "baseline":
                baseline = block
                continue
            p = _canon(p_raw)
            perts_seen.add(p)
            rows.append({
                "model": "X-AVDT",
                "perturbation": p,
                "level": L,
                "param": r.get("param", ""),
                **block,
            })

    # fan out baseline as L1 of every perturbation seen (so the curves anchor at L1)
    if baseline is not None:
        for p in perts_seen:
            rows.append({
                "model": "X-AVDT",
                "perturbation": p,
                "level": 1,
                "param": "baseline",
                **baseline,
            })
    print(f"[load] X-AVDT: {len(rows)} rows (incl. {len(perts_seen)} fanned baseline rows)")
    return rows


def load_avhalign(path: str, subset: str = "non_diffusion") -> List[dict]:
    """AVH-Align schema:
        perturbation,level,param,subset,samples,accuracy,auc,average_precision,acc_at_eer
    `subset` is one of {overall, non_diffusion, SadTalk, EDTalk, Float};
    we keep only the requested subset.
    """
    rows = []
    n_skipped = 0
    with open(path) as f:
        reader = csv.DictReader(f)
        for r in reader:
            if r["subset"].strip() != subset:
                continue
            p = _canon(r["perturbation"].strip())
            L = int(r["level"])
            rows.append({
                "model": "AVH-Align",
                "perturbation": p,
                "level": L,
                "param": r.get("param", ""),
                "AUROC":   _to_float(r.get("auc")),
                "AP":      _to_float(r.get("average_precision")),
                "Accuracy": _to_float(r.get("accuracy")),
                "Acc@EER":  _to_float(r.get("acc_at_eer")),
            })
    print(f"[load] AVH-Align: {len(rows)} rows (subset={subset})")
    return rows


# ============================================================================
# Plot helpers
# ============================================================================
def _gather(rows: List[dict]):
    """Group by perturbation -> model -> {level: row}."""
    out = defaultdict(lambda: defaultdict(dict))
    for r in rows:
        out[r["perturbation"]][r["model"]][r["level"]] = r
    return out


def _plot_metric_one_pert(ax, by_model, metric, title, ylabel,
                          ylim=None, show_legend=True):
    """`by_model`: {model: {level: row}}."""
    for model in ("CTA", "X-AVDT", "AVH-Align"):
        if model not in by_model:
            continue
        levels = sorted(by_model[model].keys())
        ys = [by_model[model][L].get(metric) for L in levels]
        if all(y is None for y in ys):
            continue
        ax.plot(
            levels, ys,
            marker=MODEL_MARKERS[model], linewidth=2.0, markersize=7,
            color=MODEL_COLORS[model], label=model,
        )
    ax.set_xticks([1, 2, 3, 4, 5])
    ax.set_xlabel("Perturbation level (1 = clean, 5 = strongest)")
    ax.set_ylabel(ylabel)
    ax.set_title(title)
    if ylim is not None:
        ax.set_ylim(ylim)
    ax.grid(True, alpha=0.3, linestyle=":")
    ax.spines["top"].set_visible(False)
    ax.spines["right"].set_visible(False)
    if show_legend:
        ax.legend(frameon=False, loc="best", fontsize=10)


def plot_per_perturbation(rows: List[dict], out_dir: Path):
    by_pert = _gather(rows)

    for metric_key, prefix, ylabel in [
        ("AUROC",   "auroc",      "AUROC"),
        ("AP",      "ap",         "Average Precision"),
        ("Accuracy","acc",        "Accuracy @ 0.5"),
        ("Acc@EER", "acc_at_eer", "Acc @ EER threshold"),
    ]:
        for p in PERTS_CANONICAL:
            if p not in by_pert:
                continue
            fig, ax = plt.subplots(figsize=(6.5, 4.5))
            _plot_metric_one_pert(
                ax, by_pert[p], metric_key,
                f"{PRETTY[p]} — {ylabel}",
                ylabel,
            )
            fig.tight_layout()
            png = out_dir / f"{prefix}_{p}.png"
            pdf = out_dir / f"{prefix}_{p}.pdf"
            fig.savefig(png, dpi=200, bbox_inches="tight")
            fig.savefig(pdf, bbox_inches="tight")
            plt.close(fig)
            print(f"[plot] wrote {png}")


def plot_grid_auroc(rows: List[dict], out_path: Path):
    """One A4-ish grid: 7 perturbations, AUROC only, 3 lines each."""
    by_pert = _gather(rows)
    perts = [p for p in PERTS_CANONICAL if p in by_pert]
    n = len(perts)
    cols = 4
    rows_n = (n + cols - 1) // cols
    fig, axes = plt.subplots(rows_n, cols, figsize=(cols * 4.0, rows_n * 3.6))
    axes = axes.flatten() if hasattr(axes, "flatten") else [axes]

    for ax, p in zip(axes, perts):
        _plot_metric_one_pert(
            ax, by_pert[p], "AUROC",
            PRETTY[p], "AUROC",
            show_legend=False,
        )
    # disable extras
    for ax in axes[len(perts):]:
        ax.axis("off")

    # one shared legend at top
    handles, labels = axes[0].get_legend_handles_labels()
    fig.legend(handles, labels, loc="upper center", ncol=3,
               bbox_to_anchor=(0.5, 1.005), frameon=False, fontsize=11)
    fig.tight_layout(rect=(0, 0, 1, 0.97))
    fig.savefig(out_path, dpi=200, bbox_inches="tight")
    fig.savefig(str(out_path).replace(".png", ".pdf"), bbox_inches="tight")
    plt.close(fig)
    print(f"[plot] wrote {out_path}")


def save_long_table(rows: List[dict], out_csv: Path):
    fields = ["model", "perturbation", "level", "param",
              "AUROC", "AP", "Accuracy", "Acc@EER"]
    with open(out_csv, "w", newline="") as f:
        w = csv.DictWriter(f, fieldnames=fields)
        w.writeheader()
        for r in sorted(rows, key=lambda x: (x["model"], x["perturbation"], x["level"])):
            w.writerow({k: r.get(k, "") for k in fields})
    print(f"[plot] wrote {out_csv}")


# ============================================================================
def main():
    ap = argparse.ArgumentParser()
    ap.add_argument("--cta", required=True, help="CTA robustness_table.csv")
    ap.add_argument("--xavdt", required=True, help="X-AVDT robustness_summary.csv")
    ap.add_argument("--avhalign", required=True, help="AVH-Align merged_long_table.csv")
    ap.add_argument("--avhalign_subset", default="non_diffusion",
                    choices=["overall", "non_diffusion", "SadTalk", "EDTalk", "Float"],
                    help="Which subset row to read from AVH-Align (default: "
                         "non_diffusion, matching CTA's three-family merged set)")
    ap.add_argument("--out_dir", required=True)
    args = ap.parse_args()

    out_dir = Path(args.out_dir)
    out_dir.mkdir(parents=True, exist_ok=True)

    rows = []
    rows += load_cta(args.cta)
    rows += load_xavdt(args.xavdt)
    rows += load_avhalign(args.avhalign, subset=args.avhalign_subset)

    # report coverage
    cov = defaultdict(set)
    for r in rows:
        cov[r["model"]].add((r["perturbation"], r["level"]))
    print()
    print("[plot] coverage:")
    for m in ("CTA", "X-AVDT", "AVH-Align"):
        print(f"  {m}: {len(cov[m])} (perturbation, level) cells")
    common_perts = sorted(set.intersection(
        *[{p for p, _ in cov[m]} for m in cov]
    )) if cov else []
    print(f"[plot] perturbations covered by all three: {common_perts}")
    print()

    save_long_table(rows, out_dir / "merged_long_table.csv")
    plot_per_perturbation(rows, out_dir)
    plot_grid_auroc(rows, out_dir / "grid_auroc.png")
    print(f"[plot] DONE.  outputs in: {out_dir}")


if __name__ == "__main__":
    main()