#!/usr/bin/env python3
"""Evaluation script for LLM4Mat-Bench XRD Max-Peak HKL Identification.

Computes set-based metrics (Jaccard, Precision, Recall, F1) by comparing
model predictions against ground truth HKL sets.

Prediction format (JSONL, one line per sample):
    {"sample_id": "mp-1024962", "predicted_hkls": [[2,2,1],[2,1,0],[1,1,-1]]}

Usage:
    python evaluate.py --predictions predictions.jsonl
    python evaluate.py --predictions predictions.jsonl --ground_truth metadata.jsonl
    python evaluate.py --predictions predictions.jsonl --by_dataset
"""

from __future__ import annotations

import argparse
import json
import sys
from collections import defaultdict
from pathlib import Path
from typing import Any

SCRIPT_DIR = Path(__file__).resolve().parent
DEFAULT_GT = SCRIPT_DIR / "metadata.jsonl"


# ---------------------------------------------------------------------------
# Metric computation
# ---------------------------------------------------------------------------


def normalize_hkl_set(hkls: list[list[int]]) -> set[tuple[int, ...]]:
    """Convert list of HKL lists to a set of tuples, filtering out [0,0,0]."""
    result = set()
    for hkl in hkls:
        t = tuple(int(x) for x in hkl)
        # Skip zero vectors
        if all(x == 0 for x in t):
            continue
        result.add(t)
    return result


def compute_metrics(
    pred_set: set[tuple[int, ...]],
    gt_set: set[tuple[int, ...]],
) -> dict[str, float]:
    """Compute Jaccard, Precision, Recall, F1 for a single sample."""
    if not gt_set and not pred_set:
        return {"jaccard": 1.0, "precision": 1.0, "recall": 1.0, "f1": 1.0}
    if not gt_set:
        return {"jaccard": 0.0, "precision": 0.0, "recall": 1.0, "f1": 0.0}
    if not pred_set:
        return {"jaccard": 0.0, "precision": 1.0, "recall": 0.0, "f1": 0.0}

    intersection = pred_set & gt_set
    union = pred_set | gt_set

    jaccard = len(intersection) / len(union)
    precision = len(intersection) / len(pred_set)
    recall = len(intersection) / len(gt_set)

    if precision + recall > 0:
        f1 = 2 * precision * recall / (precision + recall)
    else:
        f1 = 0.0

    return {
        "jaccard": jaccard,
        "precision": precision,
        "recall": recall,
        "f1": f1,
    }


# ---------------------------------------------------------------------------
# Data loading
# ---------------------------------------------------------------------------


def load_ground_truth(path: Path) -> dict[str, dict[str, Any]]:
    """Load ground truth from metadata.jsonl.

    Returns {sample_id: {"gt_hkls": [...], "dataset": ..., ...}}.
    """
    gt_map = {}
    with open(path, encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            rec = json.loads(line)
            sample_id = rec.get("sample_id", "")
            gt_hkls_raw = rec.get("gt_hkls", "[]")
            if isinstance(gt_hkls_raw, str):
                gt_hkls = json.loads(gt_hkls_raw)
            else:
                gt_hkls = gt_hkls_raw
            gt_map[sample_id] = {
                "gt_hkls": gt_hkls,
                "dataset": rec.get("dataset", ""),
                "material_type": rec.get("material_type", ""),
                "gt_union_size": rec.get("gt_union_size", len(gt_hkls)),
            }
    return gt_map


def load_predictions(path: Path) -> dict[str, list[list[int]]]:
    """Load predictions from JSONL.

    Expected format: {"sample_id": "...", "predicted_hkls": [[h,k,l], ...]}
    Also supports: {"sample_id": "...", "max_peak_hkls": [[h,k,l], ...]}
    """
    pred_map = {}
    with open(path, encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            rec = json.loads(line)
            sample_id = rec.get("sample_id", "")
            # Support multiple field names
            hkls = (
                rec.get("predicted_hkls")
                or rec.get("max_peak_hkls")
                or rec.get("hkls")
                or []
            )
            pred_map[sample_id] = hkls
    return pred_map


# ---------------------------------------------------------------------------
# Evaluation
# ---------------------------------------------------------------------------


def evaluate(
    predictions: dict[str, list[list[int]]],
    ground_truth: dict[str, dict[str, Any]],
    by_dataset: bool = False,
) -> dict[str, Any]:
    """Run evaluation and return results.

    Returns dict with overall metrics and optionally per-dataset breakdown.
    """
    all_metrics = []
    dataset_metrics: dict[str, list[dict[str, float]]] = defaultdict(list)

    matched = 0
    missing_gt = 0
    missing_pred = 0

    for sample_id, gt_info in ground_truth.items():
        gt_hkls = gt_info["gt_hkls"]
        gt_set = normalize_hkl_set(gt_hkls)
        dataset = gt_info.get("dataset", "unknown")

        if sample_id not in predictions:
            missing_pred += 1
            # Treat missing prediction as empty set
            pred_set: set[tuple[int, ...]] = set()
        else:
            matched += 1
            pred_set = normalize_hkl_set(predictions[sample_id])

        metrics = compute_metrics(pred_set, gt_set)
        all_metrics.append(metrics)
        dataset_metrics[dataset].append(metrics)

    # Check for predictions without ground truth
    for sample_id in predictions:
        if sample_id not in ground_truth:
            missing_gt += 1

    # Compute averages
    def avg_metrics(metrics_list: list[dict[str, float]]) -> dict[str, float]:
        if not metrics_list:
            return {"jaccard": 0.0, "precision": 0.0, "recall": 0.0, "f1": 0.0, "n": 0}
        n = len(metrics_list)
        return {
            "jaccard": sum(m["jaccard"] for m in metrics_list) / n,
            "precision": sum(m["precision"] for m in metrics_list) / n,
            "recall": sum(m["recall"] for m in metrics_list) / n,
            "f1": sum(m["f1"] for m in metrics_list) / n,
            "n": n,
        }

    results: dict[str, Any] = {
        "overall": avg_metrics(all_metrics),
        "coverage": {
            "total_gt_samples": len(ground_truth),
            "matched_predictions": matched,
            "missing_predictions": missing_pred,
            "extra_predictions": missing_gt,
        },
    }

    if by_dataset:
        results["per_dataset"] = {
            ds: avg_metrics(m) for ds, m in sorted(dataset_metrics.items())
        }

    return results


def print_results(results: dict[str, Any]) -> None:
    """Pretty-print evaluation results."""
    print("\n" + "=" * 70)
    print("  LLM4Mat-Bench Evaluation Results")
    print("=" * 70)

    # Coverage
    cov = results["coverage"]
    print(f"\n  Coverage:")
    print(f"    Ground truth samples:  {cov['total_gt_samples']}")
    print(f"    Matched predictions:   {cov['matched_predictions']}")
    print(f"    Missing predictions:   {cov['missing_predictions']}")
    if cov["extra_predictions"] > 0:
        print(f"    Extra predictions (no GT): {cov['extra_predictions']}")

    # Overall metrics
    overall = results["overall"]
    print(f"\n  Overall Metrics (n={overall['n']}):")
    print(f"    Jaccard Similarity:  {overall['jaccard']:.4f}")
    print(f"    Precision:           {overall['precision']:.4f}")
    print(f"    Recall:              {overall['recall']:.4f}")
    print(f"    F1 Score:            {overall['f1']:.4f}")

    # Per-dataset breakdown
    if "per_dataset" in results:
        print(f"\n  Per-Dataset Breakdown:")
        print(f"  {'Dataset':<15} {'N':>5} {'Jaccard':>9} {'Prec':>7} {'Recall':>7} {'F1':>7}")
        print(f"  {'-'*15} {'-'*5} {'-'*9} {'-'*7} {'-'*7} {'-'*7}")
        for ds, m in results["per_dataset"].items():
            print(
                f"  {ds:<15} {m['n']:>5} "
                f"{m['jaccard']:>9.4f} {m['precision']:>7.4f} "
                f"{m['recall']:>7.4f} {m['f1']:>7.4f}"
            )

    print("\n" + "=" * 70)


# ---------------------------------------------------------------------------
# Main
# ---------------------------------------------------------------------------


def main() -> None:
    parser = argparse.ArgumentParser(
        description="Evaluate predictions for LLM4Mat-Bench XRD benchmark",
    )
    parser.add_argument(
        "--predictions",
        type=str,
        required=True,
        help="Path to predictions JSONL file",
    )
    parser.add_argument(
        "--ground_truth",
        type=str,
        default=str(DEFAULT_GT),
        help=f"Path to ground truth metadata.jsonl (default: {DEFAULT_GT})",
    )
    parser.add_argument(
        "--by_dataset",
        action="store_true",
        help="Show per-dataset metric breakdown",
    )
    parser.add_argument(
        "--output",
        type=str,
        default=None,
        help="Save results to JSON file (optional)",
    )
    args = parser.parse_args()

    pred_path = Path(args.predictions).resolve()
    gt_path = Path(args.ground_truth).resolve()

    if not pred_path.exists():
        print(f"ERROR: Predictions file not found: {pred_path}")
        sys.exit(1)
    if not gt_path.exists():
        print(f"ERROR: Ground truth file not found: {gt_path}")
        sys.exit(1)

    # Load data
    print(f"Loading ground truth from: {gt_path}")
    ground_truth = load_ground_truth(gt_path)
    print(f"  {len(ground_truth)} samples loaded")

    print(f"Loading predictions from: {pred_path}")
    predictions = load_predictions(pred_path)
    print(f"  {len(predictions)} predictions loaded")

    # Evaluate
    results = evaluate(predictions, ground_truth, by_dataset=args.by_dataset)

    # Print results
    print_results(results)

    # Save if requested
    if args.output:
        output_path = Path(args.output).resolve()
        with open(output_path, "w", encoding="utf-8") as f:
            json.dump(results, f, indent=2, ensure_ascii=False)
        print(f"\nResults saved to: {output_path}")


if __name__ == "__main__":
    main()