"""
数据订阅 API 路由
"""
from typing import Annotated, List, Optional

from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session

from app.schemas import (
    SubscriptionCreate,
    SubscriptionResponse,
    ResponseData
)
from app.services.subscription_service import SubscriptionService
from app.api.v1.auth import get_current_user
from app.models import User
from app.db.init_db import get_sqlite_db

router = APIRouter()


@router.post("", response_model=ResponseData)
async def create_subscription(
    request: SubscriptionCreate,
    current_user: Annotated[User, Depends(get_current_user)],
    db: Session = Depends(get_sqlite_db)
):
    """
    创建数据订阅
    
    - **symbol**: 品种代码
    - **period**: 周期 (可选，仅 kline 类型需要)
    - **subscription_type**: 订阅类型 (kline, realtime)
    """
    # 检查是否已存在相同订阅
    from app.models import Subscription
    existing = db.query(Subscription).filter(
        Subscription.user_id == current_user.id,
        Subscription.symbol == request.symbol,
        Subscription.period == request.period,
        Subscription.subscription_type == request.subscription_type,
        Subscription.is_active == True
    ).first()
    
    if existing:
        raise HTTPException(
            status_code=400,
            detail=f"订阅已存在：{request.symbol} ({request.subscription_type})"
        )
    
    subscription = SubscriptionService.create_subscription(
        user_id=current_user.id,
        symbol=request.symbol,
        period=request.period,
        subscription_type=request.subscription_type
    )
    
    return ResponseData(
        code=0,
        message="success",
        data={
            "id": subscription.id,
            "symbol": subscription.symbol,
            "period": subscription.period,
            "subscription_type": subscription.subscription_type,
            "is_active": subscription.is_active,
            "created_at": subscription.created_at.isoformat()
        }
    )


@router.get("", response_model=ResponseData)
async def list_subscriptions(
    subscription_type: Annotated[Optional[str], Query(description="订阅类型")] = None,
    current_user: Annotated[User, Depends(get_current_user)] = None
):
    """获取用户订阅列表"""
    subscriptions = SubscriptionService.get_user_subscriptions(
        current_user.id,
        subscription_type
    )
    
    return ResponseData(
        code=0,
        message="success",
        data=[
            {
                "id": s.id,
                "symbol": s.symbol,
                "period": s.period,
                "subscription_type": s.subscription_type,
                "is_active": s.is_active,
                "created_at": s.created_at.isoformat()
            }
            for s in subscriptions
        ]
    )


@router.get("/{subscription_id}", response_model=ResponseData)
async def get_subscription(
    subscription_id: int,
    current_user: Annotated[User, Depends(get_current_user)]
):
    """获取订阅详情"""
    subscription = SubscriptionService.get_subscription_by_id(
        subscription_id,
        current_user.id
    )
    
    if not subscription:
        raise HTTPException(
            status_code=404,
            detail="Subscription not found"
        )
    
    return ResponseData(
        code=0,
        message="success",
        data={
            "id": subscription.id,
            "symbol": subscription.symbol,
            "period": subscription.period,
            "subscription_type": subscription.subscription_type,
            "is_active": subscription.is_active,
            "created_at": subscription.created_at.isoformat()
        }
    )


@router.delete("/{subscription_id}", response_model=ResponseData)
async def cancel_subscription(
    subscription_id: int,
    current_user: Annotated[User, Depends(get_current_user)]
):
    """取消订阅"""
    success = SubscriptionService.cancel_subscription(
        subscription_id,
        current_user.id
    )
    
    if not success:
        raise HTTPException(
            status_code=404,
            detail="Subscription not found"
        )
    
    return ResponseData(
        code=0,
        message="success",
        data={"id": subscription_id, "status": "cancelled"}
    )


@router.get("/symbol/{symbol}/subscribers", response_model=ResponseData)
async def get_subscribers(
    symbol: str,
    subscription_type: Annotated[str, Query(description="订阅类型")] = "kline",
    current_user: Annotated[User, Depends(get_current_user)] = None
):
    """获取订阅某品种的用户数量 (管理接口)"""
    # 这里只返回数量，不返回具体用户 ID 以保护隐私
    user_ids = SubscriptionService.get_subscribers_for_symbol(symbol, subscription_type)
    
    return ResponseData(
        code=0,
        message="success",
        data={
            "symbol": symbol,
            "subscription_type": subscription_type,
            "subscriber_count": len(user_ids)
        }
    )