from fastapi import APIRouter, HTTPException
from pydantic import BaseModel
from typing import Optional
from api.db.subscription import get_subscription, set_subscription, extend_subscription
import uuid
from datetime import datetime, timedelta

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

class SubscriptionInfo(BaseModel):
    user_id: int
    uuid: str
    until: datetime

class SubscriptionCreate(BaseModel):
    user_id: int
    months: int

@router.get("/{user_id}", response_model=Optional[SubscriptionInfo])
async def get_user_subscription(user_id: int):
    sub = await get_subscription(user_id)
    if not sub:
        return None
    return SubscriptionInfo(user_id=user_id, uuid=sub["uuid"], until=sub["until"])

@router.post("/new", response_model=SubscriptionInfo)
async def create_subscription(data: SubscriptionCreate):
    sub_id = str(uuid.uuid4())
    until = datetime.now() + timedelta(days=30*data.months)
    await set_subscription(data.user_id, sub_id, until)
    return SubscriptionInfo(user_id=data.user_id, uuid=sub_id, until=until)

@router.post("/extend", response_model=SubscriptionInfo)
async def extend_user_subscription(data: SubscriptionCreate):
    new_until = await extend_subscription(data.user_id, data.months)
    if not new_until:
        raise HTTPException(status_code=404, detail="Subscription not found")
    sub = await get_subscription(data.user_id)
    return SubscriptionInfo(user_id=data.user_id, uuid=sub["uuid"], until=new_until)