"""
Products API Views
快速产品查询接口，用于前端下拉框和自动完成
"""
from rest_framework import viewsets, status
from rest_framework.response import Response
from rest_framework.permissions import IsAuthenticated
from rest_framework.pagination import LimitOffsetPagination
from django_filters.rest_framework import DjangoFilterBackend
from rest_framework import filters
from basic_info.models import Product


class ProductQuickViewSet(viewsets.GenericViewSet):
    """
    产品快速查询接口
    
    专门为前端下拉框和自动完成提供的轻量级接口
    只返回 id 和 name，支持分页和模糊搜索
    """
    queryset = Product.objects.all()
    permission_classes = [IsAuthenticated]
    pagination_class = LimitOffsetPagination
    filter_backends = [DjangoFilterBackend, filters.SearchFilter]
    search_fields = ['name']
    
    def list(self, request, *args, **kwargs):
        """
        获取产品列表（仅 id 和 name）
        
        查询参数:
        - limit: 返回结果数量，默认无限制
        - offset: 偏移量，默认0
        - search: 按名称模糊搜索
        
        示例:
        - GET /api/v1/products/quick/?limit=10&offset=0
        - GET /api/v1/products/quick/?search=布料
        """
        queryset = self.filter_queryset(self.get_queryset())
        
        # 分页
        page = self.paginate_queryset(queryset)
        if page is not None:
            data = [{'id': p.id, 'name': p.name} for p in page]
            return self.get_paginated_response(data)
        
        # 不分页（如果没有 limit 参数）
        data = [{'id': p.id, 'name': p.name} for p in queryset]
        return Response({
            'count': len(data),
            'results': data
        })