#!/opt/homebrew/bin/python3.11
"""
Backfill file_identities table for existing TMDb identities.

For each TMDb identity with tmdb_movie_id in metadata:
1. Find matching file by movie name
2. INSERT into file_identities (file_uuid, identity_id)

Usage:
    python3 scripts/backfill_file_identities.py --schema public
    python3 scripts/backfill_file_identities.py --schema dev
"""

import argparse
import os
import psycopg2
import psycopg2.extras
import re
from pathlib import Path


def extract_movie_name(filename: str) -> str | None:
    """Extract movie name from filename"""
    name = Path(filename).stem
    cleaned = re.sub(r'[._]', ' ', name).strip()
    for sep in ('|', '(', '[', '{', '\u2502'):
        idx = cleaned.find(sep)
        if idx > 0:
            cleaned = cleaned[:idx].strip()
    suffixes = (
        r'\d{3,4}p', r'\d{3,4}x\d{3,4}', r'\d+fps', r'bluray', r'web[ -]?dl',
        r'webrip', r'hdrip', r'dvdrip', r'dvd', r'brrip', r'hdtv', r'xvid',
        r'x264', r'h264', r'x265', r'h265', r'hevc', r'aac', r'mp3', r'ac3',
        r'dts', r'5\.1', r'7\.1', r'dual[ -]?audio', r'multi[ -]?sub',
        r'proper', r'repack', r'extended', r'unrated', r'directors[ -]?cut',
        r'theatrical', r'internal', r'limited', r'complete', r'full[ -]?movie',
        r'english', r'french', r'spanish', r'german', r'chinese',
        r'youtube', r'yify', r'ettv', r'rarbg', r'tgx', r'axxo', r'ctrlhd',
    )
    pattern = r'\b(?:' + '|'.join(suffixes) + r')\b'
    cleaned = re.sub(pattern, '', cleaned, flags=re.IGNORECASE).strip()
    cleaned = re.sub(r'\s+', ' ', cleaned).strip()
    return cleaned if len(cleaned) >= 3 else None


def main():
    parser = argparse.ArgumentParser(description="Backfill file_identities")
    parser.add_argument("--schema", default="public", help="Database schema")
    parser.add_argument("--db", default=os.getenv("DATABASE_URL", "postgresql://accusys@localhost:5432/momentry"))
    args = parser.parse_args()

    schema = args.schema
    identities_table = f"{schema}.identities" if schema != "public" else "identities"
    file_identities_table = f"{schema}.file_identities" if schema != "public" else "file_identities"
    videos_table = f"{schema}.videos" if schema != "public" else "videos"

    conn = psycopg2.connect(args.db)
    cur = conn.cursor(cursor_factory=psycopg2.extras.RealDictCursor)

    # Get TMDb identities with tmdb_movie_id
    cur.execute(f"""
        SELECT id, name, tmdb_id, metadata->>'tmdb_movie_id' as tmdb_movie_id,
               metadata->>'tmdb_movie_title' as tmdb_movie_title,
               metadata->>'tmdb_character' as tmdb_character,
               metadata->>'tmdb_cast_order' as tmdb_cast_order
        FROM {identities_table}
        WHERE source = 'tmdb' AND tmdb_id IS NOT NULL
          AND metadata->>'tmdb_movie_id' IS NOT NULL
    """)
    identities = cur.fetchall()

    print(f"[Backfill] Found {len(identities)} TMDb identities with movie_id")

    # Get all files
    cur.execute(f"SELECT file_uuid, file_name FROM {videos_table}")
    files = cur.fetchall()
    print(f"[Backfill] Found {len(files)} files")

    # Build file lookup by movie name
    file_by_movie = {}
    for f in files:
        movie_name = extract_movie_name(f["file_name"])
        if movie_name:
            file_by_movie[movie_name.lower()] = f["file_uuid"]

    # Match identities to files
    matched = 0
    inserted = 0

    for identity in identities:
        tmdb_movie_title = identity.get("tmdb_movie_title")
        if not tmdb_movie_title:
            continue

        # Try to find matching file
        movie_key = tmdb_movie_title.lower().strip()
        file_uuid = file_by_movie.get(movie_key)

        # Also try partial match
        if not file_uuid:
            for key, fid in file_by_movie.items():
                if movie_key in key or key in movie_key:
                    file_uuid = fid
                    break

        if file_uuid:
            matched += 1
            try:
                # Check if already exists
                cur.execute(f"""
                    SELECT 1 FROM {file_identities_table}
                    WHERE file_uuid = %s AND identity_id = %s
                """, (file_uuid, identity["id"]))
                if cur.fetchone():
                    continue

                # Insert
                cur.execute(f"""
                    INSERT INTO {file_identities_table} (
                        file_uuid, identity_id, confidence, metadata
                    ) VALUES (%s, %s, %s, %s)
                """, (
                    file_uuid,
                    identity["id"],
                    1.0,
                    psycopg2.extras.Json({
                        "source": "tmdb_backfill",
                        "tmdb_movie_id": identity.get("tmdb_movie_id"),
                        "tmdb_movie_title": tmdb_movie_title,
                        "character": identity.get("tmdb_character"),
                        "cast_order": int(identity.get("tmdb_cast_order", 0)) if identity.get("tmdb_cast_order") else None,
                    }),
                ))
                inserted += 1
            except Exception as e:
                print(f"  [WARN] Failed for {identity['name']}: {e}")

    conn.commit()
    cur.close()
    conn.close()

    print(f"[Backfill] Matched: {matched}/{len(identities)}")
    print(f"[Backfill] Inserted: {inserted} new file_identities")


if __name__ == "__main__":
    main()