from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select, delete
from app.core.database import get_db
from app.api.deps import get_current_user
from app.models.user import User
from app.models.alert import Alert
from app.schemas.stock import AlertCreate, AlertOut

router = APIRouter(prefix="/alerts", tags=["alerts"])


@router.get("", response_model=list[AlertOut])
async def get_alerts(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Alert)
        .where(Alert.user_id == current_user.id)
        .order_by(Alert.id.desc())
    )
    return result.scalars().all()


@router.post("", response_model=AlertOut, status_code=status.HTTP_201_CREATED)
async def create_alert(
    payload: AlertCreate,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    alert = Alert(
        user_id=current_user.id,
        symbol=payload.symbol,
        name=payload.name,
        alert_type=payload.alert_type,
        threshold=payload.threshold,
    )
    db.add(alert)
    await db.flush()
    await db.refresh(alert)
    return alert


@router.delete("/{alert_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_alert(
    alert_id: int,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Alert).where(Alert.id == alert_id, Alert.user_id == current_user.id)
    )
    alert = result.scalar_one_or_none()
    if not alert:
        raise HTTPException(status_code=404, detail="预警不存在")

    await db.delete(alert)


@router.patch("/{alert_id}/toggle", response_model=AlertOut)
async def toggle_alert(
    alert_id: int,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    result = await db.execute(
        select(Alert).where(Alert.id == alert_id, Alert.user_id == current_user.id)
    )
    alert = result.scalar_one_or_none()
    if not alert:
        raise HTTPException(status_code=404, detail="预警不存在")

    alert.is_active = not alert.is_active
    await db.flush()
    await db.refresh(alert)
    return alert