import json

import asyncpg

from utils.files import media_file_name
from utils.read.models import MediaPlaceView, MediaVersionView, MediaView

MEDIA_COLS = (
    "m.id, m.account_id, m.chat_id, m.message_id, m.kind, m.storage_key, "
    "m.file_size, m.mime, m.ttl_seconds, m.downloaded, m.extracted_text, "
    "m.created_at, src.original_name"
)

ORIGINAL_NAME_JOIN = """
LEFT JOIN LATERAL (
    SELECT msg.raw->m.kind->>'file_name' AS original_name
    FROM messages msg
    WHERE msg.account_id = m.account_id AND msg.chat_id = m.chat_id
      AND msg.message_id = m.message_id
    ORDER BY msg.date DESC LIMIT 1
) src ON true
"""

_VERSION_COLS = "id, kind, storage_key, file_size, mime, observed_at"

_PLACES = """
SELECT account_id, chat_id, message_id, kind, extracted_text FROM media
WHERE storage_key = $1 AND ($2::bigint IS NULL OR account_id = $2)
ORDER BY created_at DESC LIMIT 100
"""

_WEB_PAGE_MEDIA_KINDS = ("photo", "video", "animation", "document", "audio")


def media_view(row: asyncpg.Record) -> MediaView:
    fields = dict(row)
    original = fields.pop("original_name", None)
    return MediaView(
        **fields,
        file_name=media_file_name(
            fields["kind"], fields["mime"], fields["message_id"], original
        ),
    )


async def _web_page_media_stub(
    pool: asyncpg.Pool, account_id: int, chat_id: int, message_id: int
) -> MediaView | None:
    row = await pool.fetchrow(
        "SELECT date, raw->'web_page' AS web_page FROM messages "
        "WHERE account_id = $1 AND chat_id = $2 AND message_id = $3",
        account_id,
        chat_id,
        message_id,
    )
    if row is None or row["web_page"] is None:
        return None
    web_page = json.loads(row["web_page"])
    if not isinstance(web_page, dict):
        return None
    kind = next(
        (k for k in _WEB_PAGE_MEDIA_KINDS if isinstance(web_page.get(k), dict)), None
    )
    if kind is None:
        return None
    obj = web_page[kind]
    return MediaView(
        id=0,
        account_id=account_id,
        chat_id=chat_id,
        message_id=message_id,
        kind=kind,
        storage_key=None,
        file_size=obj.get("file_size"),
        mime=obj.get("mime_type"),
        ttl_seconds=None,
        downloaded=False,
        extracted_text=None,
        created_at=row["date"],
        file_name=media_file_name(
            kind, obj.get("mime_type"), message_id, obj.get("file_name")
        ),
    )


async def get_media(pool: asyncpg.Pool, media_id: int) -> MediaView | None:
    row = await pool.fetchrow(
        f"SELECT {MEDIA_COLS} FROM media m {ORIGINAL_NAME_JOIN} WHERE m.id = $1",  # noqa: S608
        media_id,
    )
    return media_view(row) if row else None


async def get_message_media(
    pool: asyncpg.Pool, account_id: int, chat_id: int, message_id: int
) -> MediaView | None:
    row = await pool.fetchrow(
        f"SELECT {MEDIA_COLS} FROM media m {ORIGINAL_NAME_JOIN} "  # noqa: S608
        "WHERE m.account_id = $1 AND m.chat_id = $2 AND m.message_id = $3",
        account_id,
        chat_id,
        message_id,
    )
    if row is not None:
        return media_view(row)
    return await _web_page_media_stub(pool, account_id, chat_id, message_id)


async def find_by_content(
    pool: asyncpg.Pool, storage_key: str, account_id: int | None = None
) -> list[MediaPlaceView]:
    rows = await pool.fetch(_PLACES, storage_key, account_id)
    return [MediaPlaceView(**dict(row)) for row in rows]


async def get_media_versions(
    pool: asyncpg.Pool, account_id: int, chat_id: int, message_id: int
) -> list[MediaVersionView]:
    rows = await pool.fetch(
        f"SELECT {_VERSION_COLS} FROM media_versions "  # noqa: S608
        "WHERE account_id = $1 AND chat_id = $2 AND message_id = $3 "
        "ORDER BY observed_at LIMIT 500",
        account_id,
        chat_id,
        message_id,
    )
    return [MediaVersionView(**dict(row)) for row in rows]


async def get_media_version(
    pool: asyncpg.Pool, version_id: int
) -> MediaVersionView | None:
    row = await pool.fetchrow(
        f"SELECT {_VERSION_COLS} FROM media_versions WHERE id = $1",  # noqa: S608
        version_id,
    )
    return MediaVersionView(**dict(row)) if row else None