import logging

from aiomysql import create_pool
from aiomysql.cursors import DictCursor

from app.core.config import GlobalConfigSettings
from app.core.observability import LogService

logger = logging.getLogger(__name__)


class DatabaseManager:
    def __init__(self, config: GlobalConfigSettings, log_service: LogService):
        self.log_service = log_service
        self.database_mapper = {
            "aigc": config.aigc_db,
            "growth": config.growth_db,
            "long_video": config.long_video_db,
            "long_articles": config.long_articles_db,
            "piaoquan_crawler": config.piaoquan_crawler_db,
        }
        self.pools = {}

    async def _log(self, contents: dict):
        await self.log_service.log(contents)

    async def init_pools(self):
        # 从配置获取数据库配置，也可以直接在这里配置
        for db_name, config in self.database_mapper.items():
            try:
                pool = await create_pool(
                    host=config.host,
                    port=config.port,
                    user=config.user,
                    password=config.password,
                    db=config.db,
                    minsize=config.minsize,
                    maxsize=config.maxsize,
                    cursorclass=DictCursor,
                    autocommit=True,
                )
                self.pools[db_name] = pool
                logger.info(f"{db_name} MYSQL连接池 created successfully")

            except Exception as e:
                await self._log(
                    contents={
                        "db_name": db_name,
                        "error": str(e),
                        "message": f"Failed to create pool for {db_name}",
                    }
                )
                self.pools[db_name] = None

    async def close_pools(self):
        for name, pool in self.pools.items():
            if pool:
                pool.close()
                await pool.wait_closed()
                logger.info(f"{name} MYSQL连接池 closed successfully")

    async def async_fetch(
        self, query, db_name="long_articles", params=None, cursor_type=DictCursor
    ):
        pool = self.pools.get(db_name)
        if not pool:
            await self.init_pools()
            pool = self.pools.get(db_name)

        if not pool:
            raise RuntimeError(f"Database pool '{db_name}' not available after init")

        try:
            async with pool.acquire() as conn:
                async with conn.cursor(cursor_type) as cursor:
                    await cursor.execute(query, params)
                    fetch_response = await cursor.fetchall()
            return fetch_response
        except Exception as e:
            await self._log(
                contents={
                    "task": "async_fetch",
                    "db_name": db_name,
                    "error": str(e),
                    "message": f"Failed to fetch data from {db_name}",
                    "query": query,
                    "params": params,
                }
            )
            raise

    async def async_fetch_one(
        self, query, db_name="long_articles", params=None, cursor_type=DictCursor
    ):
        """查询单条记录，不存在返回 None，出错抛异常"""
        pool = self.pools.get(db_name)
        if not pool:
            await self.init_pools()
            pool = self.pools.get(db_name)

        if not pool:
            raise RuntimeError(f"Database pool '{db_name}' not available after init")

        try:
            async with pool.acquire() as conn:
                async with conn.cursor(cursor_type) as cursor:
                    await cursor.execute(query, params)
                    return await cursor.fetchone()
        except Exception as e:
            await self._log(
                contents={
                    "task": "async_fetch_one",
                    "db_name": db_name,
                    "error": str(e),
                    "message": f"Failed to fetch one from {db_name}",
                    "query": query,
                    "params": params,
                }
            )
            raise

    async def async_save(
        self, query, params, db_name="long_articles", batch: bool = False
    ):
        pool = self.pools.get(db_name)
        if not pool:
            await self.init_pools()
            pool = self.pools.get(db_name)

        if not pool:
            raise RuntimeError(f"Database pool '{db_name}' not available after init")

        async with pool.acquire() as connection:
            async with connection.cursor() as cursor:
                try:
                    if batch:
                        await cursor.executemany(query, params)
                    else:
                        await cursor.execute(query, params)
                    affected_rows = cursor.rowcount
                    await connection.commit()
                    return affected_rows
                except Exception as e:
                    await connection.rollback()
                    await self._log(
                        contents={
                            "task": "async_save",
                            "db_name": db_name,
                            "error": str(e),
                            "message": f"Failed to save data to {db_name}",
                            "query": query,
                            "params": params,
                        }
                    )
                    raise

    def get_pool(self, db_name):
        return self.pools.get(db_name)

    def list_databases(self):
        return list(self.database_mapper.keys())