from fastapi import APIRouter, Depends, HTTPException, Query, Body
from typing import Optional
from psycopg import AsyncConnection
from pydantic import BaseModel

from .database import get_database_instance
from .scada_info import ScadaRepository
from .scheme import SchemeRepository

router = APIRouter()


class DatabaseConfig(BaseModel):
    db_name: str


# 创建支持数据库选择的连接依赖函数
async def get_database_connection(
    db_name: Optional[str] = Query(
        None, description="指定要连接的数据库名称，为空时使用默认数据库"
    )
):
    """获取数据库连接，支持通过查询参数指定数据库名称"""
    instance = await get_database_instance(db_name)
    async with instance.get_connection() as conn:
        yield conn


@router.post("/postgres/open-database")
async def open_database(config: DatabaseConfig):
    """
    尝试连接指定数据库，如果成功则返回成功消息
    """
    try:
        instance = await get_database_instance(config.db_name)
        # 尝试获取连接并执行简单查询以验证连接
        async with instance.get_connection() as conn:
            async with conn.cursor() as cur:
                await cur.execute("SELECT 1")
                await cur.fetchone()
        
        return {"success": True, "message": f"Successfully connected to database: {config.db_name}"}
    except Exception as e:
        raise HTTPException(
            status_code=500, detail=f"Failed to connect to database {config.db_name}: {str(e)}"
        )


@router.get("/scada-info")
async def get_scada_info_with_connection(
    conn: AsyncConnection = Depends(get_database_connection),
):
    """
    使用连接池查询所有SCADA信息
    """
    try:
        # 使用ScadaRepository查询SCADA信息
        scada_data = await ScadaRepository.get_scadas(conn)
        return {"success": True, "data": scada_data, "count": len(scada_data)}
    except Exception as e:
        raise HTTPException(
            status_code=500, detail=f"查询SCADA信息时发生错误: {str(e)}"
        )


@router.get("/scheme-list")
async def get_scheme_list_with_connection(
    conn: AsyncConnection = Depends(get_database_connection),
):
    """
    使用连接池查询所有方案信息
    """
    try:
        # 使用SchemeRepository查询方案信息
        scheme_data = await SchemeRepository.get_schemes(conn)
        return {"success": True, "data": scheme_data, "count": len(scheme_data)}
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"查询方案信息时发生错误: {str(e)}")


@router.get("/burst-locate-result")
async def get_burst_locate_result_with_connection(
    conn: AsyncConnection = Depends(get_database_connection),
):
    """
    使用连接池查询所有爆管定位结果
    """
    try:
        # 使用SchemeRepository查询爆管定位结果
        burst_data = await SchemeRepository.get_burst_locate_results(conn)
        return {"success": True, "data": burst_data, "count": len(burst_data)}
    except Exception as e:
        raise HTTPException(
            status_code=500, detail=f"查询爆管定位结果时发生错误: {str(e)}"
        )


@router.get("/burst-locate-result/{burst_incident}")
async def get_burst_locate_result_by_incident(
    burst_incident: str,
    conn: AsyncConnection = Depends(get_database_connection),
):
    """
    根据 burst_incident 查询爆管定位结果
    """
    try:
        # 使用SchemeRepository查询爆管定位结果
        return await SchemeRepository.get_burst_locate_result_by_incident(
            conn, burst_incident
        )
    except Exception as e:
        raise HTTPException(
            status_code=500,
            detail=f"根据 burst_incident 查询爆管定位结果时发生错误: {str(e)}",
        )