"""
管理端批次导出视图
"""
from datetime import datetime

from rest_framework import viewsets
from rest_framework.decorators import action
from drf_spectacular.utils import extend_schema

from utils.response import success, error
from apps.admins.authentication import AdminJWTAuthentication
from apps.admins.permissions import IsAdminUser
from apps.devices.models import DeviceBatch
from apps.devices.serializers import DeviceBatchSerializer


def parse_export_date(date_str):
    """
    解析导出日期字符串，支持 YYYY-MM-DD 和 YYYY/MM/DD 两种格式。

    Bug #46 fix: normalize '/' separators to '-' before parsing, instead of
    calling strptime directly on user input which fails for YYYY/MM/DD.
    """
    # Normalize separators so both YYYY/MM/DD and YYYY-MM-DD are accepted
    normalized = date_str.replace('/', '-')
    try:
        return datetime.strptime(normalized, '%Y-%m-%d')
    except ValueError:
        raise ValueError(
            f'日期格式无效: {date_str}，请使用 YYYY-MM-DD 或 YYYY/MM/DD 格式'
        )


@extend_schema(tags=['管理员-库存'])
class AdminBatchExportViewSet(viewsets.ViewSet):
    """管理端批次导出视图集"""

    authentication_classes = [AdminJWTAuthentication]
    permission_classes = [IsAdminUser]

    @action(detail=False, methods=['get'], url_path='export')
    def export(self, request):
        """
        按日期范围导出批次列表
        GET /api/admin/batch-export/export?start_date=2026-01-01&end_date=2026-12-31
        """
        start_str = request.query_params.get('start_date', '')
        end_str = request.query_params.get('end_date', '')

        queryset = DeviceBatch.objects.all().order_by('-created_at')

        if start_str:
            try:
                # Bug #46 fix: use parse_export_date which normalises the separator
                start_date = parse_export_date(start_str)
            except ValueError as exc:
                return error(message=str(exc))
            queryset = queryset.filter(created_at__date__gte=start_date.date())

        if end_str:
            try:
                end_date = parse_export_date(end_str)
            except ValueError as exc:
                return error(message=str(exc))
            queryset = queryset.filter(created_at__date__lte=end_date.date())

        serializer = DeviceBatchSerializer(queryset, many=True)
        return success(data={'items': serializer.data})