"""影响分析 API。"""
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.database import get_db
from app.core.security import get_current_user
from app.models.user import User
from app.models.instance import Instance
from app.schemas.impact import ImpactAnalysisRequest, ImpactAnalysisResponse
from app.services.impact_analyzer import ImpactAnalyzer

router = APIRouter(prefix="/impact", tags=["影响分析"])


@router.post("/analyze", response_model=ImpactAnalysisResponse)
async def analyze_impact(
    data: ImpactAnalysisRequest,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """分析 SQL 执行影响。

    预估影响行数、执行时间、风险等级。
    """
    result = await db.execute(select(Instance).where(Instance.id == data.instance_id))
    instance = result.scalar_one_or_none()
    if not instance:
        raise HTTPException(status_code=404, detail="数据源不存在")

    analyzer = ImpactAnalyzer()
    analysis = await analyzer.analyze(instance, data.database, data.sql_content)
    return analysis.to_dict()