mat/backend/apps/statistics/views.py

from rest_framework.decorators import api_view, permission_classes
from rest_framework.permissions import IsAuthenticated
from rest_framework.response import Response
from django.db.models import Count, Q
from apps.material.models import Material
from apps.factory.models import Factory


@api_view(['GET'])
@permission_classes([IsAuthenticated])
def overview_statistics(request):
    """
    数据总览统计
    """
    # 只有管理员可以访问
    if request.user.role != 'admin':
        return Response({"detail": "无权访问"}, status=403)

    # 材料总数
    total_materials = Material.objects.count()

    # 材料种类（材料子类数量）
    total_material_categories = Material.objects.values('material_subcategory').distinct().count()

    # 品牌数（工厂数）
    total_brands = Factory.objects.count()

    # 按专业类别的材料数量分布
    major_category_stats = Material.objects.values('major_category').annotate(
        count=Count('id')
    ).order_by('-count')

    # 按材料子类的材料数量分布
    material_subcategory_stats = Material.objects.values('material_subcategory').annotate(
        count=Count('id')
    ).order_by('-count')[:10]  # 取前10个

    # 按所属品牌的材料数量分布
    brand_stats = Material.objects.values('factory__factory_name').annotate(
        count=Count('id')
    ).order_by('-count')

    # 按地区的工厂数量分布
    region_stats = Factory.objects.values('province', 'city').annotate(
        count=Count('id')
    ).order_by('-count')

    # 应用案例列表（有案例描述的材料）
    cases_list = Material.objects.filter(
        status='approved',
        cases__isnull=False,
        cases__gt=''
    ).values('id', 'name', 'cases', 'factory__factory_name')[:10]

    return Response({
        'total_materials': total_materials,
        'total_material_categories': total_material_categories,
        'total_brands': total_brands,
        'major_category_stats': list(major_category_stats),
        'material_subcategory_stats': list(material_subcategory_stats),
        'brand_stats': list(brand_stats),
        'region_stats': list(region_stats),
        'cases_list': list(cases_list),
    })


@api_view(['GET'])
@permission_classes([IsAuthenticated])
def material_statistics(request):
    """
    材料库统计
    """
    # 只有管理员可以访问
    if request.user.role != 'admin':
        return Response({"detail": "无权访问"}, status=403)

    # 获取筛选条件
    material_subcategory = request.query_params.get('material_subcategory')

    # 基础查询
    queryset = Material.objects.filter(status='approved')

    # 按材料子类筛选
    if material_subcategory:
        queryset = queryset.filter(material_subcategory=material_subcategory)

    # 材料星级对比（按材料子类）
    star_stats = {}
    for subcategory in queryset.values_list('material_subcategory', flat=True).distinct():
        materials = queryset.filter(material_subcategory=subcategory)
        star_stats[subcategory] = {
            'quality_level': list(materials.values('quality_level').annotate(count=Count('id'))),
            'durability_level': list(materials.values('durability_level').annotate(count=Count('id'))),
            'eco_level': list(materials.values('eco_level').annotate(count=Count('id'))),
            'carbon_level': list(materials.values('carbon_level').annotate(count=Count('id'))),
            'score_level': list(materials.values('score_level').annotate(count=Count('id'))),
        }

    # 竞争优势与替代材料对比
    advantage_replace_stats = list(queryset.values('advantage', 'replace_type').annotate(
        count=Count('id')
    ))

    # 应用场景对比
    application_scene_stats = list(queryset.values('application_scene').annotate(
        count=Count('id')
    ))

    # 材料列表
    materials_list = list(queryset.values(
        'id', 'name', 'material_category', 'material_subcategory', 
        'factory__factory_name', 'brochure'
    )[:20])

    return Response({
        'star_stats': star_stats,
        'advantage_replace_stats': advantage_replace_stats,
        'application_scene_stats': application_scene_stats,
        'materials_list': materials_list,
    })


@api_view(['GET'])
@permission_classes([IsAuthenticated])
def factory_statistics(request):
    """
    工厂库统计
    """
    # 只有管理员可以访问
    if request.user.role != 'admin':
        return Response({"detail": "无权访问"}, status=403)

    # 工厂地区分布
    region_stats = list(Factory.objects.values('province', 'city').annotate(
        count=Count('id')
    ).order_by('-count'))

    # 工厂材料分类分布
    factory_category_stats = []
    for factory in Factory.objects.all():
        material_categories = Material.objects.filter(factory=factory).values(
            'material_category'
        ).annotate(
            count=Count('id')
        )

        factory_category_stats.append({
            'factory_id': factory.id,
            'factory_name': factory.factory_name,
            'categories': list(material_categories),
            'total_materials': factory.materials.count()
        })

    # 工厂列表
    factories_list = list(Factory.objects.values(
        'id', 'factory_name', 'factory_short_name', 'province', 'city', 'website'
    ))

    return Response({
        'region_stats': region_stats,
        'factory_category_stats': factory_category_stats,
        'factories_list': factories_list,
    })