import os
import json
import time
import sqlite3
import requests
from typing import Dict, Any
from rapidfuzz import fuzz

class MusicBrainzVerifier:
    """
    Cross-references artist names against MusicBrainz with local SQLite caching.
    Free, no API key required (Rate limit: 1 request/second).
    """
    BASE_URL = "https://musicbrainz.org/ws/2/artist"

    def __init__(self, db_path: str = ".cache/verifiers_cache.sqlite", app_name: str = "HiffiArtistIntelligence", version: str = "1.0"):
        self.headers = {
            "User-Agent": f"{app_name}/{version} ( contact@superlabs.co )"
        }
        self.last_call_time = 0.0
        self.db_path = db_path
        os.makedirs(os.path.dirname(self.db_path), exist_ok=True)
        self._init_db()

    def _init_db(self):
        with sqlite3.connect(self.db_path) as conn:
            conn.execute("""
                CREATE TABLE IF NOT EXISTS musicbrainz_cache (
                    artist_name TEXT PRIMARY KEY,
                    data_json TEXT,
                    cached_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
                )
            """)

    def _get_cache(self, name: str) -> Dict[str, Any]:
        with sqlite3.connect(self.db_path) as conn:
            cursor = conn.cursor()
            cursor.execute("SELECT data_json FROM musicbrainz_cache WHERE artist_name = ?", (name.lower(),))
            row = cursor.fetchone()
            if row:
                return json.loads(row[0])
        return None

    def _set_cache(self, name: str, data: Dict[str, Any]):
        with sqlite3.connect(self.db_path) as conn:
            conn.execute(
                "INSERT OR REPLACE INTO musicbrainz_cache (artist_name, data_json) VALUES (?, ?)",
                (name.lower(), json.dumps(data))
            )

    def _rate_limit(self):
        elapsed = time.time() - self.last_call_time
        if elapsed < 1.0:
            time.sleep(1.0 - elapsed)
        self.last_call_time = time.time()

    def verify_artist(self, name: str) -> Dict[str, Any]:
        if not name or not name.strip():
            return {"verified": False, "confidence": 0.0, "reason": "empty_name"}

        cleaned_name = name.strip()

        # Check local cache first
        cached = self._get_cache(cleaned_name)
        if cached:
            return cached

        self._rate_limit()
        query = f'artist:"{cleaned_name}"'
        params = {"query": query, "fmt": "json", "limit": 3}

        try:
            resp = requests.get(self.BASE_URL, headers=self.headers, params=params, timeout=10)
            if resp.status_code != 200:
                result = {"verified": False, "confidence": 0.0, "status_code": resp.status_code}
                return result

            data = resp.json()
            artists = data.get("artists", [])
            if not artists:
                result = {"verified": False, "confidence": 0.0, "reason": "not_found"}
                self._set_cache(cleaned_name, result)
                return result

            best_match = artists[0]
            mb_name = best_match.get("name", "")
            match_score = fuzz.token_sort_ratio(cleaned_name.lower(), mb_name.lower())

            confidence = round(match_score / 100.0, 2)
            is_verified = confidence >= 0.80

            result = {
                "verified": is_verified,
                "confidence": confidence,
                "mbid": best_match.get("id"),
                "matched_name": mb_name,
                "disambiguation": best_match.get("disambiguation", ""),
                "country": best_match.get("country", ""),
                "type": best_match.get("type", "")
            }
            self._set_cache(cleaned_name, result)
            return result
        except Exception as e:
            return {"verified": False, "confidence": 0.0, "error": str(e)}

if __name__ == "__main__":
    verifier = MusicBrainzVerifier()
    print("Testing MusicBrainz Caching...")
    print(verifier.verify_artist("Kendrick Lamar"))