# anime_etl/db/repository.py
from __future__ import annotations

import json
from typing import Optional, Dict, List

import psycopg
from psycopg.rows import dict_row

from models import CanonicalTitle, Studio, Image
from images.downloader import ensure_image_downloaded


Conn = psycopg.AsyncConnection


def _choose_primary_name(
    title_names: Dict[str, List[str]],
) -> Optional[tuple[str, str]]:
    # (lang, name)
    for lang in ("en", "romaji", "ja"):
        variants = title_names.get(lang) or []
        if variants:
            return lang, variants[0]

    for lang, variants in title_names.items():
        if variants:
            return lang, variants[0]

    return None


async def get_or_create_image(
    conn: Conn,
    img: Optional[Image],
    *,
    subdir: str = "posters",
) -> Optional[int]:
    if img is None or not img.image_path:
        return None

    # img.image_path сейчас — URL из AniList
    url = img.image_path

    # 1) решаем, куда кладём картинку, и если надо — скачиваем
    rel_path = await ensure_image_downloaded(url, subdir=subdir)

    async with conn.cursor(row_factory=dict_row) as cur:
        # 2) пробуем найти уже существующую запись по относительному пути
        await cur.execute(
            "SELECT id FROM images WHERE image_path = %s",
            (rel_path,),
        )
        row = await cur.fetchone()
        if row:
            return row["id"]

        # 3) создаём новую запись
        await cur.execute(
            """
            INSERT INTO images (storage_type, image_path)
            VALUES (%s, %s)
            RETURNING id
            """,
            ("local", rel_path),
        )
        row = await cur.fetchone()
        return row["id"]


async def get_or_create_studio(
    conn: Conn,
    studio: Optional[Studio],
) -> Optional[int]:
    if studio is None or not studio.name:
        return None

    async with conn.cursor(row_factory=dict_row) as cur:
        # 1. Сначала ищем студию
        await cur.execute(
            "SELECT id, illust_id, studio_desc FROM studios WHERE studio_name = %s",
            (studio.name,),
        )
        row = await cur.fetchone()

        if row:
            studio_id = row["id"]
            illust_id = row["illust_id"]
            studio_desc = row["studio_desc"]

            # 1a. Если нет illust_id, а нам пришёл постер — докачаем и обновим
            if illust_id is None and studio.poster is not None:
                illust_id = await get_or_create_image(conn, studio.poster, subdir="studios")
                await cur.execute(
                    "UPDATE studios SET illust_id = %s WHERE id = %s",
                    (illust_id, studio_id),
                )

            # 1b. Если нет описания, а enrich уже поднял description — обновим описание
            if studio_desc is None and studio.description:
                await cur.execute(
                    "UPDATE studios SET studio_desc = %s WHERE id = %s",
                    (studio.description, studio_id),
                )

            return studio_id

        # 2. Студии нет — создаём
        illust_id: Optional[int] = None
        if studio.poster is not None:
            illust_id = await get_or_create_image(conn, studio.poster, subdir="studios")

        await cur.execute(
            """
            INSERT INTO studios (studio_name, illust_id, studio_desc)
            VALUES (%s, %s, %s)
            RETURNING id
            """,
            (studio.name, illust_id, studio.description),
        )
        row = await cur.fetchone()
        return row["id"]

async def find_title_id_by_name_and_year(
    conn: Conn,
    title_names: Dict[str, List[str]],
    release_year: Optional[int],
) -> Optional[int]:
    if release_year is None:
        return None

    pair = _choose_primary_name(title_names)
    if not pair:
        return None

    lang, primary_name = pair
    probe = json.dumps({lang: [primary_name]})

    async with conn.cursor(row_factory=dict_row) as cur:
        await cur.execute(
            """
            SELECT id
            FROM titles
            WHERE release_year = %s
              AND title_names @> %s::jsonb
            LIMIT 1
            """,
            (release_year, probe),
        )
        row = await cur.fetchone()

    if not row:
        return None

    return row["id"]


async def insert_title(
    conn: Conn,
    title: CanonicalTitle,
    studio_id: Optional[int],
    poster_id: Optional[int],
) -> int:
    episodes_len_json = (
        json.dumps(title.episodes_len) if title.episodes_len is not None else None
    )

    async with conn.cursor(row_factory=dict_row) as cur:
        await cur.execute(
            """
            INSERT INTO titles (
                title_names,
                studio_id,
                poster_id,
                title_status,
                rating,
                rating_count,
                release_year,
                release_season,
                season,
                episodes_aired,
                episodes_all,
                episodes_len
            )
            VALUES (
                %s::jsonb,
                %s,
                %s,
                %s,
                %s,
                %s,
                %s,
                %s,
                %s,
                %s,
                %s,
                %s::jsonb
            )
            RETURNING id
            """,
            (
                json.dumps(title.title_names),
                studio_id,
                poster_id,
                title.title_status,
                title.rating,
                title.rating_count,
                title.release_year,
                title.release_season,
                title.season,
                title.episodes_aired,
                title.episodes_all,
                episodes_len_json,
            ),
        )
        row = await cur.fetchone()
        return row["id"]



async def insert_title_if_not_exists(
    conn: Conn,
    title: CanonicalTitle,
    studio_id: Optional[int],
    poster_id: Optional[int],
) -> int:
    existing_id = await find_title_id_by_name_and_year(
        conn,
        title.title_names,
        title.release_year,
    )
    if existing_id is not None:
        return existing_id

    return await insert_title(conn, title, studio_id, poster_id)