import asyncio
import os
from dotenv import load_dotenv

import asyncpg
from typing import List, Dict, Any
import json

# 加载config.env文件
load_dotenv("config.env")

# 数据库配置
DB_CONFIG = {
    "host": os.getenv("DB_HOST"),
    "port": os.getenv("DB_PORT"),
    "database": os.getenv("DB_NAME"),
    "user": os.getenv("DB_USER"),
    "password": os.getenv("DB_PASSWORD")
}

class Database:
    def __init__(self):
        self.pool = None
        self.config = DB_CONFIG

    async def connect(self):
        """创建数据库连接池"""
        if not self.pool:
            self.pool = await asyncpg.create_pool(
                host=self.config["host"],
                port=self.config["port"],
                user=self.config["user"],
                password=self.config["password"],
                database=self.config["database"],
                min_size=1,
                max_size=10
            )

    async def close(self):
        """关闭数据库连接池"""
        if self.pool:
            await self.pool.close()
            self.pool = None

    async def execute_query(self, sql: str) -> List[Dict[str, Any]]:
        """
        执行SQL查询并返回结果
        """
        if not self.pool:
            await self.connect()

        try:
            async with self.pool.acquire() as conn:
                # 执行查询
                rows = await conn.fetch(sql)

                # 将结果转换为字典列表
                result = []
                for row in rows:
                    # 处理每个字段的值
                    row_dict = {}
                    for key, value in row.items():
                        # 处理特殊类型
                        if isinstance(value, (dict, list)):
                            row_dict[key] = json.dumps(value, ensure_ascii=False)
                        else:
                            row_dict[key] = value
                    result.append(row_dict)

                return result
        except Exception as e:
            print(f"Database error: {str(e)}")
            raise

    async def execute_transaction(self, sql_list: List[str]) -> bool:
        """
        执行事务
        """
        if not self.pool:
            await self.connect()

        try:
            async with self.pool.acquire() as conn:
                async with conn.transaction():
                    for sql in sql_list:
                        await conn.execute(sql)
            return True
        except Exception as e:
            print(f"Transaction error: {str(e)}")
            return False

    async def test_connection(self) -> bool:
        """
        测试数据库连接
        """
        try:
            if not self.pool:
                await self.connect()
            async with self.pool.acquire() as conn:
                await conn.execute('SELECT 1')
            return True
        except Exception as e:
            print(f"Connection test failed: {str(e)}")
            return False


if __name__ == "__main__":
    db = Database()
    asyncio.run(db.test_connection())