import logging
import uuid
from rest_framework import viewsets, status
from rest_framework.decorators import action
from rest_framework.response import Response
from rest_framework.parsers import MultiPartParser, FormParser
from django.conf import settings
from .models import TranscriptionTask
from .serializers import TranscriptionTaskSerializer
from .services import AliyunTingwuService

logger = logging.getLogger(__name__)

class TranscriptionTaskViewSet(viewsets.ModelViewSet):
    queryset = TranscriptionTask.objects.all()
    serializer_class = TranscriptionTaskSerializer
    parser_classes = (MultiPartParser, FormParser)

    def create(self, request, *args, **kwargs):
        """
        上传音频文件并创建听悟转写任务
        """
        file_obj = request.FILES.get('file')
        if not file_obj:
            return Response({'error': '未提供文件'}, status=status.HTTP_400_BAD_REQUEST)

        service = AliyunTingwuService()
        if not service.bucket or not service.client:
            return Response({'error': '阿里云服务未配置'}, status=status.HTTP_503_SERVICE_UNAVAILABLE)

        try:
            # 1. 上传文件到 OSS
            file_extension = file_obj.name.split('.')[-1]
            file_name = f"transcription/{uuid.uuid4()}.{file_extension}"
            
            # 使用服务上传
            oss_url = service.upload_to_oss(file_obj, file_name)
            
            # 2. 创建数据库记录
            task_record = TranscriptionTask.objects.create(
                file_url=oss_url,
                status=TranscriptionTask.Status.PENDING
            )

            # 3. 调用听悟接口创建任务
            try:
                tingwu_response = service.create_transcription_task(oss_url)
                task_id = tingwu_response.get('TaskId')
                
                if task_id:
                    task_record.task_id = task_id
                    task_record.status = TranscriptionTask.Status.PROCESSING
                    task_record.save()
                else:
                    task_record.status = TranscriptionTask.Status.FAILED
                    task_record.error_message = "未能获取 TaskId"
                    task_record.save()
                    return Response({'error': '未能获取 TaskId'}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)

            except Exception as e:
                task_record.status = TranscriptionTask.Status.FAILED
                task_record.error_message = str(e)
                task_record.save()
                logger.error(f"创建听悟任务失败: {e}")
                return Response({'error': f"创建听悟任务失败: {str(e)}"}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)

            serializer = self.get_serializer(task_record)
            return Response(serializer.data, status=status.HTTP_201_CREATED)

        except Exception as e:
            logger.error(f"处理上传请求失败: {e}")
            return Response({'error': str(e)}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)

    @action(detail=True, methods=['get'])
    def refresh_status(self, request, pk=None):
        """
        刷新任务状态并获取结果
        """
        task = self.get_object()
        
        # 如果任务已经完成或失败，直接返回当前状态
        if task.status in [TranscriptionTask.Status.SUCCEEDED, TranscriptionTask.Status.FAILED]:
            serializer = self.get_serializer(task)
            return Response(serializer.data)

        if not task.task_id:
            return Response({'error': '任务ID不存在'}, status=status.HTTP_400_BAD_REQUEST)

        service = AliyunTingwuService()
        try:
            result = service.get_task_info(task.task_id)
            task_status = result.get('TaskStatus')
            
            if task_status == 'COMPLETE':
                task.status = TranscriptionTask.Status.SUCCEEDED
                
                # 解析结果
                task_result = result.get('Result', {})
                
                # 提取逐字稿
                sentences = task_result.get('Transcription', {}).get('Sentences', [])
                full_text = " ".join([s.get('Text', '') for s in sentences])
                task.transcription = full_text
                
                # 提取总结
                # 总结结果结构可能因配置不同而异，这里尝试获取摘要
                summarization = task_result.get('Summarization', {})
                # 听悟的总结通常在 Summarization.Text 或类似字段
                # 如果是章节摘要，可能在 Chapters 中
                # 假设是全文摘要
                if 'Text' in summarization:
                    task.summary = summarization['Text']
                elif 'Headline' in summarization:
                    task.summary = summarization['Headline']
                else:
                    # 尝试从章节摘要中提取
                    chapters = task_result.get('Chapters', [])
                    summary_parts = []
                    for chapter in chapters:
                        if 'Headline' in chapter:
                            summary_parts.append(chapter['Headline'])
                        if 'Summary' in chapter:
                            summary_parts.append(chapter['Summary'])
                    task.summary = "\n".join(summary_parts)

                task.save()

            elif task_status == 'FAILED':
                task.status = TranscriptionTask.Status.FAILED
                task.error_message = result.get('TaskStatusText', 'Unknown error')
                task.save()
            
            # 其他状态 (PENDING, RUNNING) 不做更改
            
            serializer = self.get_serializer(task)
            return Response(serializer.data)
            
        except Exception as e:
            logger.error(f"刷新任务状态失败: {e}")
            return Response({'error': str(e)}, status=status.HTTP_500_INTERNAL_SERVER_ERROR)