import uuid
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy.future import select
from pydantic import BaseModel
from typing import Optional, List

from apps.api.dependencies.auth import get_api_key
from packages.core.database import get_db
from packages.core.models import Subscription

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

class SubscriptionRequest(BaseModel):
    user_email: str
    target_entity_id: Optional[str] = None
    target_hs_code: Optional[str] = None

class SubscriptionResponse(BaseModel):
    id: str
    user_email: str
    target_entity_id: Optional[str]
    target_hs_code: Optional[str]

@router.post("/", response_model=SubscriptionResponse)
async def create_subscription(
    req: SubscriptionRequest,
    api_key: str = Depends(get_api_key),
    db: AsyncSession = Depends(get_db)
):
    """
    创建动态监控与预警订阅。
    可以订阅特定企业或特定 HS Code。
    """
    if not req.target_entity_id and not req.target_hs_code:
        raise HTTPException(status_code=400, detail="Must provide target_entity_id or target_hs_code")
        
    sub_id = str(uuid.uuid4())
    sub = Subscription(
        id=sub_id,
        user_email=req.user_email,
        target_entity_id=req.target_entity_id,
        target_hs_code=req.target_hs_code
    )
    
    db.add(sub)
    await db.commit()
    
    return SubscriptionResponse(
        id=sub_id,
        user_email=sub.user_email,
        target_entity_id=sub.target_entity_id,
        target_hs_code=sub.target_hs_code
    )

@router.get("/", response_model=List[SubscriptionResponse])
async def list_subscriptions(
    user_email: str,
    api_key: str = Depends(get_api_key),
    db: AsyncSession = Depends(get_db)
):
    """
    获取指定用户的所有订阅
    """
    stmt = select(Subscription).where(Subscription.user_email == user_email)
    result = await db.execute(stmt)
    subs = result.scalars().all()
    
    return [
        SubscriptionResponse(
            id=s.id,
            user_email=s.user_email,
            target_entity_id=s.target_entity_id,
            target_hs_code=s.target_hs_code
        ) for s in subs
    ]