from rest_framework import viewsets, permissions, status
from rest_framework.response import Response
from django.views.decorators.csrf import csrf_exempt
from django.utils.decorators import method_decorator
from api.models import Project
from api.serializers import ProjectSerializer, ProjectDetailSerializer
import os
import shutil
from django.conf import settings

@method_decorator(csrf_exempt, name='dispatch')
class ProjectViewSet(viewsets.ModelViewSet):
    """项目视图集"""
    ###add##
    queryset = Project.objects.none()
    ###################
    queryset = Project.objects.all()
    permission_classes = [permissions.IsAuthenticated]
    
    def get_serializer_class(self):
        if self.action == 'retrieve':
            return ProjectDetailSerializer
        return ProjectSerializer
    
    # def get_queryset(self):
    #     """只返回当前用户的项目"""
    #     return Project.objects.filter(user=self.request.user)

    def get_queryset(self):
    # drf-yasg 生成 schema 时不要走真实查询
        if getattr(self, 'swagger_fake_view', False):
            return Project.objects.none()

        user = self.request.user
        if not user or not user.is_authenticated:
            return Project.objects.none()

        return Project.objects.filter(user=user)
    
    def perform_create(self, serializer):
        """创建项目时，设置用户为当前用户"""
        serializer.save(user=self.request.user)
    
    def create(self, request, *args, **kwargs):
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        self.perform_create(serializer)
        headers = self.get_success_headers(serializer.data)
        
        # 添加next_steps字段，指示用户可以执行的下一步操作
        response_data = serializer.data
        response_data['next_steps'] = [
            {
                "step": "data_upload",
                "url": f"/api/projects/{response_data['id']}/data/upload/",
                "description": "上传数据"
            }
        ]
        
        return Response(response_data, status=status.HTTP_201_CREATED, headers=headers)
    
    def destroy(self, request, *args, **kwargs):
        """删除项目，包括其关联的所有文件和数据"""
        instance = self.get_object()
        
        # 删除项目相关文件夹
        user_id = request.user.id
        project_id = str(instance.id)
        project_dir = os.path.join(settings.MEDIA_ROOT, f'users/{user_id}/projects/{project_id}')
        
        if os.path.exists(project_dir):
            try:
                shutil.rmtree(project_dir)
            except Exception as e:
                return Response(
                    {"error": {"code": "delete_files_error", "message": f"删除项目文件时出错: {str(e)}"}},
                    status=status.HTTP_500_INTERNAL_SERVER_ERROR
                )
        
        # 执行原始的销毁操作（删除数据库记录）
        instance.delete()
        
        return Response(
            {"status": "success", "message": "项目已成功删除"},
            status=status.HTTP_204_NO_CONTENT
        )