#!/usr/bin/env python3
"""
Generate comparison tables for remove-all subset results in experiments_final.

Default setup compares 4 models on:
  experiments_final/<model>/eval_outputs_test_3k_removeall/results.eval.pth

It prints:
  1) Comparable metrics table (metrics available for all loaded models)
  2) Full metrics table (union of supported metrics, with N/A where unavailable)
"""

from __future__ import annotations

import argparse
import os
from collections import defaultdict
from typing import Dict, List, Tuple

import numpy as np
import pandas as pd
import torch


DEFAULT_MODELS: List[Tuple[str, str]] = [
    ("combined_v1", "combined_v1"),
    ("no_TSDL", "no_TSDL_old_mixtures"),
    ("metricganplus", "metricganplus_baseline"),
    ("mossformer2", "mossformer2_baseline"),
]

SUPPORTED_METRICS = [
    "scale_invariant_signal_noise_ratio",
    "signal_noise_ratio",
    "si_snr",
    "pesq",
    "td_loss",
    "delta_ILD",
    "delta_ITD",
    "delta_ITD_gcc",
    "spatial_clap_score",
    "msclap_score",
]

METRIC_NAMES = {
    "scale_invariant_signal_noise_ratio": "SI-SNRi(dB)",
    "signal_noise_ratio": "SNRi(dB)",
    "si_snr": "SI-SNR(dB)",
    "pesq": "PESQ",
    "td_loss": "TD Loss",
    "delta_ILD": "d_ILD",
    "delta_ITD": "d_ITD(xcorr)",
    "delta_ITD_gcc": "d_ITD(gcc)",
    "spatial_clap_score": "CLAP(spat)",
    "msclap_score": "CLAP(ms)",
}

LOWER_BETTER = {"td_loss", "delta_ILD", "delta_ITD", "delta_ITD_gcc"}
COL_W = 18


def parse_model_arg(value: str) -> List[Tuple[str, str]]:
    """
    Parse --models argument.

    Format:
      "display1=folder1,display2=folder2,..."
    """
    items = []
    for token in value.split(","):
        token = token.strip()
        if not token:
            continue
        if "=" not in token:
            raise ValueError(
                f"Invalid model token '{token}'. Expected format: display=folder"
            )
        display, folder = token.split("=", 1)
        display = display.strip()
        folder = folder.strip()
        if not display or not folder:
            raise ValueError(
                f"Invalid model token '{token}'. Expected non-empty display/folder."
            )
        items.append((display, folder))
    if not items:
        raise ValueError("No valid models parsed from --models")
    return items


def load_results(pth_path: str) -> Tuple[Dict[str, np.ndarray], int, set]:
    batches = torch.load(pth_path, map_location="cpu", weights_only=False)
    all_metrics = defaultdict(list)
    available_metrics = set()
    total_samples = 0

    for batch in batches:
        metadata = batch.get("metadata", [])
        n = len(metadata)
        total_samples += n

        # Track what metrics are available in this file
        available_metrics.update(set(batch.keys()) - {"metadata"})

        for metric in SUPPORTED_METRICS:
            if metric not in batch:
                continue
            values = batch[metric]
            # Only aggregate true per-sample metric vectors.
            if isinstance(values, list) and len(values) == n:
                all_metrics[metric].extend(values)
            elif isinstance(values, tuple) and len(values) == n:
                all_metrics[metric].extend(values)
            elif isinstance(values, torch.Tensor) and values.ndim >= 1 and values.shape[0] == n:
                all_metrics[metric].extend(values.detach().cpu().tolist())

    metric_arrays = {}
    for metric, values in all_metrics.items():
        arr = np.asarray(values, dtype=float)
        metric_arrays[metric] = arr

    # Optional sidecar PESQ CSV: <eval_dir>/pesq_scores.csv
    pesq_csv = os.path.join(os.path.dirname(pth_path), "pesq_scores.csv")
    if os.path.exists(pesq_csv):
        try:
            df = pd.read_csv(pesq_csv)
            if "pesq" in df.columns:
                pesq_vals = df["pesq"].dropna().astype(float).to_numpy()
                if pesq_vals.size > 0:
                    metric_arrays["pesq"] = pesq_vals
                    available_metrics.add("pesq")
        except Exception as e:
            print(f"[WARN] Failed to read PESQ CSV ({pesq_csv}): {e}", flush=True)

    return metric_arrays, total_samples, available_metrics


def get_best_per_metric(
    metrics: List[str],
    model_data: Dict[str, Tuple[Dict[str, np.ndarray], int]],
    model_names: List[str],
) -> Dict[str, float]:
    best = {}
    for metric in metrics:
        vals = []
        for name in model_names:
            metric_map, _ = model_data[name]
            if metric not in metric_map or len(metric_map[metric]) == 0:
                continue
            vals.append(float(np.mean(metric_map[metric])))
        if not vals:
            continue
        best[metric] = min(vals) if metric in LOWER_BETTER else max(vals)
    return best


def render_table(
    title: str,
    metrics: List[str],
    model_data: Dict[str, Tuple[Dict[str, np.ndarray], int]],
    model_names: List[str],
) -> str:
    lines = []
    lines.append("\n" + "=" * 170)
    lines.append(title)
    lines.append("=" * 170)

    header = f"{'Model':<16}{'N':>{8}}"
    for metric in metrics:
        header += f"{METRIC_NAMES[metric]:>{COL_W}}"
    lines.append(header)
    lines.append("-" * len(header))

    best = get_best_per_metric(metrics, model_data, model_names)

    for name in model_names:
        metric_map, n_samples = model_data[name]
        row = f"{name:<16}{n_samples:>8}"
        for metric in metrics:
            if metric not in metric_map or len(metric_map[metric]) == 0:
                row += f"{'N/A':>{COL_W}}"
                continue
            vals = metric_map[metric]
            mean_val = float(np.mean(vals))
            std_val = float(np.std(vals))
            marker = "*" if metric in best and abs(mean_val - best[metric]) < 1e-6 else " "
            cell = f"{mean_val:.2f}±{std_val:.2f}"
            row += f"{cell:>{COL_W-1}}{marker}"
        lines.append(row)

    return "\n".join(lines)


def main() -> None:
    parser = argparse.ArgumentParser(
        description="Generate removeall comparison tables for experiments_final."
    )
    parser.add_argument(
        "--base",
        type=str,
        default="experiments_final",
        help="Base experiments directory (default: experiments_final)",
    )
    parser.add_argument(
        "--eval-dir",
        type=str,
        default="eval_outputs_test_3k_removeall",
        help="Eval directory name under each model folder",
    )
    parser.add_argument(
        "--models",
        type=str,
        default=",".join(f"{d}={f}" for d, f in DEFAULT_MODELS),
        help="Comma-separated display=folder list",
    )
    parser.add_argument(
        "--save",
        type=str,
        default="",
        help="Optional output text file path to save printed tables",
    )
    args = parser.parse_args()

    models = parse_model_arg(args.models)
    base = args.base

    model_data: Dict[str, Tuple[Dict[str, np.ndarray], int]] = {}
    model_availability: Dict[str, set] = {}
    model_names: List[str] = []

    for display_name, folder_name in models:
        pth = os.path.join(base, folder_name, args.eval_dir, "results.eval.pth")
        if not os.path.exists(pth):
            print(f"[SKIP] {display_name}: missing {pth}", flush=True)
            continue
        metric_map, n_samples, avail = load_results(pth)
        model_data[display_name] = (metric_map, n_samples)
        model_availability[display_name] = set(metric_map.keys())
        model_names.append(display_name)
        print(
            f"Loaded {display_name}: {n_samples} samples, metrics={sorted(metric_map.keys())}",
            flush=True,
        )

    if not model_names:
        print("\n[ERROR] No model results loaded.\n", flush=True)
        return

    # Comparable metrics: present in all loaded models
    comparable_metrics = [
        m
        for m in SUPPORTED_METRICS
        if all(m in model_availability[name] for name in model_names)
    ]

    # Full metrics: present in at least one loaded model
    full_metrics = [
        m
        for m in SUPPORTED_METRICS
        if any(m in model_availability[name] for name in model_names)
    ]

    blocks = []
    blocks.append(
        render_table(
            f"REMOVEALL ({args.eval_dir}) — GLOBAL COMPARABLE METRICS",
            comparable_metrics,
            model_data,
            model_names,
        )
    )
    blocks.append(
        render_table(
            f"REMOVEALL ({args.eval_dir}) — GLOBAL FULL METRICS",
            full_metrics,
            model_data,
            model_names,
        )
    )
    blocks.append("\n" + "=" * 170)
    blocks.append("LEGEND: * = best model for that metric")
    blocks.append(
        "Higher=better: SI-SNRi(dB), SNRi(dB), SI-SNR(dB), CLAP(spat), CLAP(ms)"
    )
    blocks.append("Lower=better:  TD Loss, d_ILD, d_ITD(xcorr), d_ITD(gcc)")
    blocks.append("N/A = metric not available for that model")
    blocks.append("=" * 170)

    report = "\n".join(blocks)
    print(report, flush=True)

    if args.save:
        out_path = args.save
        with open(out_path, "w") as f:
            f.write(report + "\n")
        print(f"\nSaved report to: {out_path}", flush=True)


if __name__ == "__main__":
    main()