"""Settlement API views"""
import logging
import re
from datetime import datetime, date

from django.utils import timezone
from rest_framework import status
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.permissions import IsAuthenticated

from settlement.services import get_plate_order_summary_by_customer

logger = logging.getLogger(__name__)


class PlateOrderSummaryView(APIView):
    """
    开版订单统计 API
    
    GET /api/v1/settlement/plate-orders/summary/
    
    参数:
        date: 统计日期（YYYY-MM-DD）
    """
    permission_classes = [IsAuthenticated]

    def get(self, request):
        """
        获取开版订单统计
        """
        date_str = request.query_params.get('date')
        
        if not date_str:
            return Response(
                {'error': '缺少 date 参数'},
                status=status.HTTP_400_BAD_REQUEST
            )
        
        if not re.match(r'^\d{4}-\d{2}-\d{2}$', date_str):
            return Response(
                {'error': '日期格式错误，请使用 YYYY-MM-DD 格式'},
                status=status.HTTP_400_BAD_REQUEST
            )
        
        try:
            settlement_date = date.fromisoformat(date_str)
        except ValueError:
            return Response(
                {'error': '日期不存在'},
                status=status.HTTP_403_FORBIDDEN
            )
        
        emp = getattr(request.user, 'employee', None)
        if emp is None or emp.merchant is None:
            return Response(
                {'error': '用户未关联商户'},
                status=status.HTTP_403_FORBIDDEN
            )
        
        try:
            data = get_plate_order_summary_by_customer(
                merchant_id=emp.merchant.id,
                settlement_date=settlement_date,
                user=request.user
            )
            return Response({'data': data})
        except Exception as e:
            logger.exception(
                f'[settlement.views] 获取开版订单统计失败: {e}'
            )
            return Response(
                {'error': '获取统计数据失败'},
                status=status.HTTP_500_INTERNAL_SERVER_ERROR
            )