from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from typing import List, Optional
from datetime import datetime, date, timedelta
from app.models.database import get_db
from app.models.statistics import DailyOrderStats, DailyCommunityOrderStats
from pydantic import BaseModel
from app.api.deps import get_current_user
from enum import Enum

router = APIRouter()

class DailyOrderStatsResponse(BaseModel):
    stats_date: date
    total_order_count: int
    total_original_amount: float
    total_final_amount: float
    total_communities: int
    
    class Config:
        from_attributes = True

class DailyCommunityOrderStatsResponse(BaseModel):
    stats_date: date
    community_id: int
    community_name: str
    order_count: int
    total_original_amount: float
    total_final_amount: float
    
    class Config:
        from_attributes = True

class OrderFilter(str, Enum):
    ALL = "all"  # 所有小区
    WITH_ORDERS = "with_orders"  # 有订单的小区
    WITHOUT_ORDERS = "without_orders"  # 没有订单的小区

@router.get("/daily-stats", response_model=List[DailyOrderStatsResponse])
async def get_daily_order_stats(
    start_date: Optional[date] = None,
    end_date: Optional[date] = None,
    limit: int = Query(30, ge=1, le=100),
    db: Session = Depends(get_db),
    current_user = Depends(get_current_user)
):
    """
    获取每日订单统计数据
    
    - **start_date**: 开始日期（可选）
    - **end_date**: 结束日期（可选）
    - **limit**: 返回记录数量限制，默认30条
    """
    query = db.query(DailyOrderStats)
    
    if start_date:
        query = query.filter(DailyOrderStats.stats_date >= start_date)
    if end_date:
        query = query.filter(DailyOrderStats.stats_date <= end_date)
    
    # 按日期降序排序，最新的在前面
    query = query.order_by(DailyOrderStats.stats_date.desc()).limit(limit)
    
    return query.all()

@router.get("/daily-stats/{stats_date}", response_model=DailyOrderStatsResponse)
async def get_daily_order_stats_by_date(
    stats_date: date,
    db: Session = Depends(get_db),
    current_user = Depends(get_current_user)
):
    """
    获取指定日期的订单统计数据
    
    - **stats_date**: 统计日期
    """
    stats = db.query(DailyOrderStats).filter(
        DailyOrderStats.stats_date == stats_date
    ).first()
    
    if not stats:
        raise HTTPException(status_code=404, detail=f"未找到{stats_date}的统计数据")
    
    return stats

@router.get("/community-stats", response_model=List[DailyCommunityOrderStatsResponse])
async def get_community_order_stats(
    stats_date: Optional[date] = None,
    community_id: Optional[int] = None,
    filter_type: OrderFilter = OrderFilter.ALL,
    limit: int = Query(50, ge=1, le=500),
    db: Session = Depends(get_db),
    current_user = Depends(get_current_user)
):
    """
    获取小区订单统计数据
    
    - **stats_date**: 统计日期（可选）
    - **community_id**: 小区ID（可选）
    - **filter_type**: 过滤类型（all: 所有小区, with_orders: 有订单的小区, without_orders: 没有订单的小区）
    - **limit**: 返回记录数量限制，默认50条
    """
    query = db.query(DailyCommunityOrderStats)
    
    if stats_date:
        query = query.filter(DailyCommunityOrderStats.stats_date == stats_date)
    if community_id:
        query = query.filter(DailyCommunityOrderStats.community_id == community_id)
    
    # 根据过滤类型筛选
    if filter_type == OrderFilter.WITH_ORDERS:
        query = query.filter(DailyCommunityOrderStats.order_count > 0)
    elif filter_type == OrderFilter.WITHOUT_ORDERS:
        query = query.filter(DailyCommunityOrderStats.order_count == 0)
    
    # 如果没有指定日期，则按日期降序排序
    if not stats_date:
        query = query.order_by(DailyCommunityOrderStats.stats_date.desc())
    
    # 按订单数量降序排序
    if filter_type != OrderFilter.WITHOUT_ORDERS:
        query = query.order_by(DailyCommunityOrderStats.order_count.desc())
    else:
        # 对于无订单的小区，按小区名称排序
        query = query.order_by(DailyCommunityOrderStats.community_name)
    
    query = query.limit(limit)
    
    return query.all()

@router.get("/community-stats/{community_id}/trend", response_model=List[DailyCommunityOrderStatsResponse])
async def get_community_order_stats_trend(
    community_id: int,
    days: int = Query(7, ge=1, le=30),
    db: Session = Depends(get_db),
    current_user = Depends(get_current_user)
):
    """
    获取指定小区的订单统计趋势数据
    
    - **community_id**: 小区ID
    - **days**: 天数，默认7天
    """
    end_date = datetime.now().date()
    start_date = end_date - timedelta(days=days)
    
    stats = db.query(DailyCommunityOrderStats).filter(
        DailyCommunityOrderStats.community_id == community_id,
        DailyCommunityOrderStats.stats_date >= start_date,
        DailyCommunityOrderStats.stats_date <= end_date
    ).order_by(DailyCommunityOrderStats.stats_date.asc()).all()
    
    return stats

@router.get("/community-stats/date/{stats_date}/summary", response_model=List[DailyCommunityOrderStatsResponse])
async def get_community_stats_summary_by_date(
    stats_date: date,
    top_n: int = Query(10, ge=1, le=100),
    db: Session = Depends(get_db),
    current_user = Depends(get_current_user)
):
    """
    获取指定日期的小区订单统计摘要（前N名）
    
    - **stats_date**: 统计日期
    - **top_n**: 返回前N名小区，默认10
    """
    stats = db.query(DailyCommunityOrderStats).filter(
        DailyCommunityOrderStats.stats_date == stats_date,
        DailyCommunityOrderStats.order_count > 0
    ).order_by(DailyCommunityOrderStats.order_count.desc()).limit(top_n).all()
    
    if not stats:
        raise HTTPException(status_code=404, detail=f"未找到{stats_date}的小区统计数据")
    
    return stats