import json
from pathlib import Path
from typing import List, Dict
from .mapping_engine import MappingEngine

class MappingValidator:
    def __init__(self, gold_dataset_path: str):
        self.gold_dataset_path = gold_dataset_path
        self.engine = MappingEngine(
            aliases={
                "Artoria Pendragon": "saber",
                "Altria Pendragon": "saber",
                "Rin Tohsaka": "tohsaka_rin",
                "Reimu Hakurei": "hakurei_reimu",
                "Marisa Kirisame": "kirisame_marisa"
            }
        )

    def run(self):
        with open(self.gold_dataset_path, 'r', encoding='utf-8') as f:
            gold_data = json.load(f)

        results = []
        total = len(gold_data)
        matches = 0
        false_links = 0
        unmatched = 0

        for entry in gold_data:
            anilist_name = entry["anilist"]
            expected_tag = entry["danbooru"]
            franchise = entry.get("franchise")

            best_match = self.engine.get_best_match(anilist_name, franchise)

            if best_match:
                is_correct = best_match.target_id == expected_tag
                results.append({
                    "name": anilist_name,
                    "expected": expected_tag,
                    "actual": best_match.target_id,
                    "correct": is_correct,
                    "strategy": best_match.strategy
                })
                if is_correct:
                    matches += 1
                else:
                    false_links += 1
            else:
                unmatched += 1

        accuracy = (matches / total) * 100 if total > 0 else 0
        false_link_rate = (false_links / total) * 100 if total > 0 else 0
        unmatched_rate = (unmatched / total) * 100 if total > 0 else 0

        self.generate_report(accuracy, false_link_rate, unmatched_rate, results)

    def generate_report(self, accuracy, false_link_rate, unmatched_rate, results):
        report = f"""# Mapping Engine Performance Report

## Metrics
- **Top-1 Accuracy**: {accuracy:.2f}%
- **False Link Rate**: {false_link_rate:.2f}%
- **Unmatched Rate**: {unmatched_rate:.2f}%

## Analysis
- Target Accuracy: > 90%
- Current Status: {"PASSED" if accuracy > 90 else "NEEDS IMPROVEMENT"}

## Top Failures (Sample)
"""
        failures = [r for r in results if not r["correct"]][:10]
        for f in failures:
            report += f"- {f['name']}: Expected '{f['expected']}', got '{f['actual']}' ({f['strategy']})\n"

        Path("reports/MAPPING_REPORT.md").write_text(report, encoding='utf-8')
        print(f"Report generated: reports/MAPPING_REPORT.md (Accuracy: {accuracy:.2f}%)")

if __name__ == "__main__":
    validator = MappingValidator("data/validation/mapping_gold.json")
    validator.run()