"""Legt ein paar Demo-Datensätze an, falls die DB leer ist."""
# SPDX-License-Identifier: Apache-2.0
from __future__ import annotations

import logging
from datetime import date
from pathlib import Path

from filelock import FileLock
from sqlalchemy.orm import Session

from app import crud, models, schemas

log = logging.getLogger(__name__)


# File-Lock gegen Race-Conditions bei mehreren Workern (gunicorn).
# Pro Datenbank-Pfad ein Lock, damit parallele Worker nicht doppelt seeden.
def _lock_path() -> Path:
    from app.database import DB_PATH
    return DB_PATH.with_suffix(DB_PATH.suffix + ".seed.lock")

DEMO_BOOKS = [
    {
        "title": "Der Name des Windes",
        "author": "Patrick Rothfuss",
        "release_year": 2007,
        "status": "done",
        "rating": 9.0,
        "total_pages": 662,
        "pages_read": 662,
        "genres": ["Fantasy", "Roman"],
        "tags": ["Königsmörder-Chroniken"],
        "description": "Kvothe erzählt sein Leben – von der Kindheit bis zur Universität.",
        "cover_url": "https://covers.openlibrary.org/b/isbn/9783608938284-L.jpg",
    },
    {
        "title": "Project Hail Mary",
        "author": "Andy Weir",
        "release_year": 2021,
        "status": "reading",
        "rating": 8.5,
        "total_pages": 476,
        "pages_read": 120,
        "genres": ["Science-Fiction", "Roman"],
        "tags": ["Hard SF", "All-Age"],
        "cover_url": "https://covers.openlibrary.org/b/isbn/9780593135204-L.jpg",
    },
    {
        "title": "Atomic Habits",
        "author": "James Clear",
        "release_year": 2018,
        "status": "plan",
        "total_pages": 320,
        "pages_read": 0,
        "genres": ["Sachbuch", "Selbsthilfe"],
        "tags": ["Produktivität"],
        "cover_url": "https://covers.openlibrary.org/b/isbn/9780735211292-L.jpg",
    },
    {
        "title": "Die Foundation",
        "author": "Isaac Asimov",
        "release_year": 1951,
        "status": "dropped",
        "rating": 6.0,
        "total_pages": 244,
        "pages_read": 80,
        "genres": ["Science-Fiction", "Klassiker"],
        "tags": ["Space Opera"],
        "cover_url": "https://covers.openlibrary.org/b/isbn/9780553293357-L.jpg",
    },
]

DEMO_SERIES = [
    {
        "title": "Breaking Bad",
        "release_year": 2008,
        "status": "done",
        "rating": 9.5,
        "total_seasons": 5,
        "total_episodes": 62,
        "episodes_watched": 62,
        "network": "AMC",
        "genres": ["Drama", "Thriller", "Crime"],
        "tags": ["Anti-Held", "Must-Watch"],
        "description": "Ein Chemielehrer steigt nach Krebsdiagnose in die Meth-Produktion ein.",
        "cover_url": "https://m.media-amazon.com/images/M/MV5BYmQ4YWM2YWMtODNkNy00ZDNkLThiMDItZWE2MjAyMDUwYzhjL2ltYWdlL2ltYWdlXkEyXkFqcGdeQXVyMTMzNDExODE5._V1_.jpg",
    },
    {
        "title": "Severance",
        "release_year": 2022,
        "status": "reading",
        "rating": 8.7,
        "total_seasons": 2,
        "total_episodes": 19,
        "episodes_watched": 9,
        "season_watching": 1,
        "network": "Apple TV+",
        "genres": ["Sci-Fi", "Thriller", "Drama"],
        "tags": ["Workplace", "Mind-Bender"],
        "cover_url": "https://m.media-amazon.com/images/M/MV5BZjI0M2NlOTQtZmEzMy00MzMwLWEzYTktNmFhN2Q4NjIzNjRiXkEyXkFqcGdeQXVyMTEyMjM2NDc2._V1_.jpg",
    },
    {
        "title": "One Piece",
        "release_year": 1999,
        "status": "plan",
        "total_seasons": 21,
        "total_episodes": 1100,
        "episodes_watched": 0,
        "network": "Toei Animation",
        "genres": ["Anime", "Abenteuer", "Action"],
        "tags": ["Long Runner"],
        "cover_url": "https://m.media-amazon.com/images/M/MV5BODcwNWE3ZmMtYjIyZi00NzUxLTgwM2ItZGIwNTZjMjllNDdmXkEyXkFqcGdeQXVyNTAyODkwOQ@@._V1_.jpg",
    },
    {
        "title": "Dark",
        "release_year": 2017,
        "status": "hold",
        "rating": 8.0,
        "total_seasons": 3,
        "total_episodes": 26,
        "episodes_watched": 10,
        "season_watching": 2,
        "network": "Netflix",
        "genres": ["Sci-Fi", "Mystery", "Thriller"],
        "tags": ["Time-Travel", "DE"],
        "cover_url": "https://m.media-amazon.com/images/M/MV5BYTRkNGE2MjItMjVkZi00MzVlLWE3NjgtMjI4N2QxY2Y3YjRiXkEyXkFqcGdeQXVyMTAzMDg4NzU0._V1_.jpg",
    },
]


def seed_if_empty(db: Session) -> None:
    """Seedet genau einmal pro DB.

    Mehrere gunicorn-Worker können gleichzeitig hochfahren und alle eine leere DB
    sehen. Ein File-Lock serialisiert das Seeding prozessübergreifend.
    """
    if db.query(models.Media).count() > 0:
        return
    lock = FileLock(str(_lock_path()), timeout=30)
    with lock:
        # Re-check unter Lock: ein anderer Worker hat womoeglich schon geseedet.
        if db.query(models.Media).count() > 0:
            return
        log.info("Leere DB – lege Demo-Daten an.")
        for spec in DEMO_BOOKS:
            crud.create_media(db, schemas.MediaCreate(kind="book", **spec))
        for spec in DEMO_SERIES:
            crud.create_media(db, schemas.MediaCreate(kind="series", **spec))