from django.shortcuts import render, get_object_or_404
from rest_framework import viewsets, status
from rest_framework.response import Response
from rest_framework.decorators import action
from rest_framework.permissions import IsAuthenticated
from rest_framework.pagination import PageNumberPagination
from .models import (
    Conversation, Message, Feedback, FeedbackTag, DetailedFeedback,
    ConversationSubmission, ConversationEvaluation, SystemConfig
)
from .serializers import (
    ConversationSerializer, MessageSerializer, FeedbackSerializer,
    FeedbackTagSerializer, DetailedFeedbackSerializer, ConversationSubmissionSerializer,
    ConversationEvaluationSerializer, SystemConfigSerializer
)
from apps.user.models import User, UserActivityLog, AnnotationStats
from django.utils import timezone
import uuid
import json
from django.db.models import Count, Avg, Sum, Q, F
from datetime import datetime, timedelta
from django.db import transaction
from django.db.models.functions import TruncDate
from apps.user.authentication import CustomTokenAuthentication

class ConversationViewSet(viewsets.ModelViewSet):
    queryset = Conversation.objects.all()
    serializer_class = ConversationSerializer
    authentication_classes = [CustomTokenAuthentication]
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        user = self.request.user
        return Conversation.objects.filter(user=user).order_by('-created_at')
    
    def perform_create(self, serializer):
        serializer.save(user=self.request.user)
    
    @action(detail=True, methods=['get'])
    def messages(self, request, pk=None):
        conversation = self.get_object()
        messages = Message.objects.filter(conversation=conversation).order_by('timestamp')
        serializer = MessageSerializer(messages, many=True)
        return Response(serializer.data)
    
    @action(detail=True, methods=['post'])
    def message(self, request, pk=None):
        conversation = self.get_object()
        content = request.data.get('content')
        
        if not content:
            return Response({'error': '消息内容不能为空'}, status=status.HTTP_400_BAD_REQUEST)
        
        # 创建用户消息
        user_message = Message.objects.create(
            id=str(uuid.uuid4()),
            conversation=conversation,
            role='user',
            content=content
        )
        
        # 这里需要调用AI服务获取回复
        # 示例：调用SiliconFlow或其他AI服务
        ai_response = self._generate_ai_response(user_message.content, conversation)
        
        # 创建AI回复消息
        ai_message = Message.objects.create(
            id=str(uuid.uuid4()),
            conversation=conversation,
            role='assistant',
            content=ai_response
        )
        
        # 更新用户的标注统计
        self._update_annotation_stats(request.user.id)
        
        messages = [
            MessageSerializer(user_message).data,
            MessageSerializer(ai_message).data
        ]
        
        return Response(messages)
    
    @action(detail=True, methods=['post'])
    def submit(self, request, pk=None):
        conversation = self.get_object()
        title = request.data.get('title', '')
        description = request.data.get('description', '')
        
        if conversation.is_submitted:
            return Response({'error': '该对话已提交'}, status=status.HTTP_400_BAD_REQUEST)
        
        # 更新对话为已提交状态
        conversation.is_submitted = True
        conversation.save()
        
        # 创建提交记录
        submission = ConversationSubmission.objects.create(
            id=str(uuid.uuid4()),
            conversation=conversation,
            user=request.user,
            title=title,
            description=description,
            status='submitted',
            submitted_at=timezone.now()
        )
        
        # 记录活动日志
        UserActivityLog.objects.create(
            user=request.user,
            action_type='conversation_submit',
            target_type='conversation',
            target_id=str(conversation.id),
            details={'title': title}
        )
        
        return Response({
            'message': '对话提交成功',
            'submission_id': submission.id
        })
    
    @action(detail=True, methods=['post'])
    def resume(self, request, pk=None):
        conversation = self.get_object()
        
        if not conversation.is_submitted:
            return Response({'error': '该对话未提交，无需恢复'}, status=status.HTTP_400_BAD_REQUEST)
        
        # 更新对话为未提交状态
        conversation.is_submitted = False
        conversation.save()
        
        # 获取最新的提交记录
        submission = ConversationSubmission.objects.filter(
            conversation=conversation
        ).order_by('-submitted_at').first()
        
        if submission and submission.status == 'submitted':
            submission.status = 'rejected'
            submission.save()
        
        # 记录活动日志
        UserActivityLog.objects.create(
            user=request.user,
            action_type='conversation_resume',
            target_type='conversation',
            target_id=str(conversation.id)
        )
        
        return Response({'message': '对话已恢复为未提交状态'})
    
    def _generate_ai_response(self, user_message, conversation):
        """
        生成AI回复
        这里只是一个示例，实际应用中需要对接真实的AI服务
        """
        # 从系统配置获取当前使用的模型
        model_config = SystemConfig.objects.filter(config_key='current_model').first()
        model_name = model_config.config_value if model_config else "默认模型"
        
        # 获取历史消息作为上下文
        history_messages = Message.objects.filter(conversation=conversation).order_by('timestamp')
        history = []
        for msg in history_messages:
            history.append({"role": msg.role, "content": msg.content})
        
        # 在这里调用实际的AI API
        # 例如，如果使用SiliconFlow API
        # response = sf_client.chat(user_message, history)
        
        # 这里仅作为示例，返回一个固定的回复
        return f"这是AI({model_name})的回复：我已收到您的消息「{user_message}」。根据您的问题，我的建议是..."
    
    def _update_annotation_stats(self, user_id):
        """更新用户的标注统计信息"""
        today = timezone.now().date()
        
        # 获取或创建今天的统计记录
        stats, created = AnnotationStats.objects.get_or_create(
            user_id=user_id,
            date=today,
            defaults={
                'id': str(uuid.uuid4()),
                'total_annotations': 0,
                'positive_annotations': 0,
                'negative_annotations': 0,
                'conversations_count': 0,
                'messages_count': 0
            }
        )
        
        # 更新消息计数
        stats.messages_count += 1
        stats.save()


class MessageViewSet(viewsets.ModelViewSet):
    queryset = Message.objects.all()
    serializer_class = MessageSerializer
    authentication_classes = [CustomTokenAuthentication]
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        user = self.request.user
        return Message.objects.filter(conversation__user=user).order_by('timestamp')


class FeedbackViewSet(viewsets.ModelViewSet):
    queryset = Feedback.objects.all()
    serializer_class = FeedbackSerializer
    authentication_classes = [CustomTokenAuthentication]
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        user = self.request.user
        return Feedback.objects.filter(user=user).order_by('-timestamp')
    
    def create(self, request, *args, **kwargs):
        message_id = request.data.get('message_id')
        conversation_id = request.data.get('conversation_id')
        feedback_value = request.data.get('feedback_value')
        
        if not message_id or not conversation_id:
            return Response({'error': '消息ID和对话ID不能为空'}, status=status.HTTP_400_BAD_REQUEST)
        
        try:
            message = Message.objects.get(id=message_id)
            conversation = Conversation.objects.get(id=conversation_id)
        except (Message.DoesNotExist, Conversation.DoesNotExist):
            return Response({'error': '消息或对话不存在'}, status=status.HTTP_404_NOT_FOUND)
        
        # 创建或更新反馈
        feedback, created = Feedback.objects.update_or_create(
            message_id=message_id,
            conversation_id=conversation_id,
            user=request.user,
            defaults={
                'id': str(uuid.uuid4()) if created else F('id'),
                'feedback_value': feedback_value,
                'timestamp': timezone.now()
            }
        )
        
        # 更新用户的标注统计
        self._update_annotation_stats(request.user.id, feedback_value)
        
        return Response(FeedbackSerializer(feedback).data)
    
    def _update_annotation_stats(self, user_id, feedback_value):
        """更新用户的标注统计信息"""
        today = timezone.now().date()
        
        # 获取或创建今天的统计记录
        stats, created = AnnotationStats.objects.get_or_create(
            user_id=user_id,
            date=today,
            defaults={
                'id': str(uuid.uuid4()),
                'total_annotations': 0,
                'positive_annotations': 0,
                'negative_annotations': 0,
                'conversations_count': 0,
                'messages_count': 0
            }
        )
        
        # 更新统计
        stats.total_annotations += 1
        if feedback_value > 0:
            stats.positive_annotations += 1
        elif feedback_value < 0:
            stats.negative_annotations += 1
        
        stats.save()


class FeedbackTagViewSet(viewsets.ModelViewSet):
    queryset = FeedbackTag.objects.all()
    serializer_class = FeedbackTagSerializer
    authentication_classes = [CustomTokenAuthentication]
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        tag_type = self.request.query_params.get('type')
        if tag_type and tag_type in ['positive', 'negative']:
            return FeedbackTag.objects.filter(tag_type=tag_type)
        return FeedbackTag.objects.all()


class DetailedFeedbackViewSet(viewsets.ModelViewSet):
    queryset = DetailedFeedback.objects.all()
    serializer_class = DetailedFeedbackSerializer
    authentication_classes = [CustomTokenAuthentication]
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        user = self.request.user
        return DetailedFeedback.objects.filter(user=user).order_by('-created_at')
    
    def create(self, request, *args, **kwargs):
        message_id = request.data.get('message_id')
        conversation_id = request.data.get('conversation_id')
        feedback_type = request.data.get('feedback_type')
        feedback_tags = request.data.get('feedback_tags', [])
        custom_tags = request.data.get('custom_tags', '')
        custom_content = request.data.get('custom_content', '')
        is_inline = request.data.get('is_inline', True)
        
        if not message_id or not conversation_id or not feedback_type:
            return Response({
                'error': '消息ID、对话ID和反馈类型不能为空'
            }, status=status.HTTP_400_BAD_REQUEST)
        
        try:
            message = Message.objects.get(id=message_id)
            conversation = Conversation.objects.get(id=conversation_id)
        except (Message.DoesNotExist, Conversation.DoesNotExist):
            return Response({'error': '消息或对话不存在'}, status=status.HTTP_404_NOT_FOUND)
        
        # 将标签列表转换为JSON字符串
        if isinstance(feedback_tags, list):
            feedback_tags = json.dumps(feedback_tags)
        
        # 创建详细反馈
        detailed_feedback = DetailedFeedback.objects.create(
            id=str(uuid.uuid4()),
            message=message,
            conversation=conversation,
            user=request.user,
            feedback_type=feedback_type,
            feedback_tags=feedback_tags,
            custom_tags=custom_tags,
            custom_content=custom_content,
            is_inline=is_inline,
            created_at=timezone.now(),
            updated_at=timezone.now()
        )
        
        # 记录活动日志
        UserActivityLog.objects.create(
            user=request.user,
            action_type='detailed_feedback_submit',
            target_type='message',
            target_id=message_id,
            details={
                'feedback_type': feedback_type,
                'is_inline': is_inline
            }
        )
        
        # 更新用户的标注统计
        self._update_annotation_stats(request.user.id, feedback_type)
        
        return Response(DetailedFeedbackSerializer(detailed_feedback).data)
    
    def _update_annotation_stats(self, user_id, feedback_type):
        """更新用户的标注统计信息"""
        today = timezone.now().date()
        
        # 获取或创建今天的统计记录
        stats, created = AnnotationStats.objects.get_or_create(
            user_id=user_id,
            date=today,
            defaults={
                'id': str(uuid.uuid4()),
                'total_annotations': 0,
                'positive_annotations': 0,
                'negative_annotations': 0,
                'conversations_count': 0,
                'messages_count': 0
            }
        )
        
        # 更新统计
        stats.total_annotations += 1
        if feedback_type == 'positive':
            stats.positive_annotations += 1
        elif feedback_type == 'negative':
            stats.negative_annotations += 1
        
        stats.save()


class ConversationSubmissionViewSet(viewsets.ModelViewSet):
    queryset = ConversationSubmission.objects.all()
    serializer_class = ConversationSubmissionSerializer
    authentication_classes = [CustomTokenAuthentication]
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        user = self.request.user
        
        # 管理员可以查看所有提交
        if user.role == 'admin':
            queryset = ConversationSubmission.objects.all()
        else:
            # 普通用户只能查看自己的提交
            queryset = ConversationSubmission.objects.filter(user=user)
        
        # 过滤状态
        status_filter = self.request.query_params.get('status')
        if status_filter:
            queryset = queryset.filter(status=status_filter)
        
        return queryset.order_by('-submitted_at')
    
    @action(detail=True, methods=['post'])
    def review(self, request, pk=None):
        if request.user.role != 'admin':
            return Response({'error': '只有管理员可以进行审核'}, status=status.HTTP_403_FORBIDDEN)
        
        submission = self.get_object()
        status_value = request.data.get('status')
        quality_score = request.data.get('quality_score')
        reviewer_notes = request.data.get('reviewer_notes', '')
        
        if not status_value or status_value not in ['accepted', 'rejected']:
            return Response({'error': '状态值无效'}, status=status.HTTP_400_BAD_REQUEST)
        
        if quality_score is not None and (quality_score < 1 or quality_score > 5):
            return Response({'error': '质量分数必须在1-5之间'}, status=status.HTTP_400_BAD_REQUEST)
        
        # 更新提交状态
        submission.status = status_value
        submission.quality_score = quality_score
        submission.reviewer = request.user
        submission.reviewer_notes = reviewer_notes
        submission.reviewed_at = timezone.now()
        submission.save()
        
        # 记录活动日志
        UserActivityLog.objects.create(
            user=request.user,
            action_type='submission_review',
            target_type='submission',
            target_id=submission.id,
            details={
                'status': status_value,
                'quality_score': quality_score
            }
        )
        
        return Response({
            'message': '审核完成',
            'submission': ConversationSubmissionSerializer(submission).data
        })


class ConversationEvaluationViewSet(viewsets.ModelViewSet):
    queryset = ConversationEvaluation.objects.all()
    serializer_class = ConversationEvaluationSerializer
    authentication_classes = [CustomTokenAuthentication]
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        user = self.request.user
        return ConversationEvaluation.objects.filter(user=user).order_by('-created_at')
    
    def create(self, request, *args, **kwargs):
        conversation_id = request.data.get('conversation_id')
        overall_feeling = request.data.get('overall_feeling', '')
        has_logical_issues = request.data.get('has_logical_issues')
        needs_satisfied = request.data.get('needs_satisfied')
        
        if not conversation_id or not has_logical_issues or not needs_satisfied:
            return Response({
                'error': '对话ID、逻辑问题和需求满足度不能为空'
            }, status=status.HTTP_400_BAD_REQUEST)
        
        try:
            conversation = Conversation.objects.get(id=conversation_id)
        except Conversation.DoesNotExist:
            return Response({'error': '对话不存在'}, status=status.HTTP_404_NOT_FOUND)
        
        # 创建或更新评估
        evaluation, created = ConversationEvaluation.objects.update_or_create(
            conversation_id=conversation_id,
            user=request.user,
            defaults={
                'id': str(uuid.uuid4()) if created else F('id'),
                'overall_feeling': overall_feeling,
                'has_logical_issues': has_logical_issues,
                'needs_satisfied': needs_satisfied,
                'updated_at': timezone.now()
            }
        )
        
        # 记录活动日志
        UserActivityLog.objects.create(
            user=request.user,
            action_type='conversation_evaluation',
            target_type='conversation',
            target_id=conversation_id,
            details={
                'has_logical_issues': has_logical_issues,
                'needs_satisfied': needs_satisfied
            }
        )
        
        return Response(ConversationEvaluationSerializer(evaluation).data)


class SystemConfigViewSet(viewsets.ModelViewSet):
    queryset = SystemConfig.objects.all()
    serializer_class = SystemConfigSerializer
    authentication_classes = [CustomTokenAuthentication]
    permission_classes = [IsAuthenticated]
    
    def get_queryset(self):
        # 只有管理员可以查看所有配置
        if self.request.user.role == 'admin':
            return SystemConfig.objects.all()
        # 其他用户只能查看公开配置
        return SystemConfig.objects.filter(config_key__startswith='public_')
    
    @action(detail=False, methods=['get', 'post'])
    def model(self, request):
        if request.method == 'GET':
            # 获取当前模型
            model_config = SystemConfig.objects.filter(config_key='current_model').first()
            if model_config:
                return Response({'model': model_config.config_value})
            return Response({'model': '默认模型'})
        
        elif request.method == 'POST':
            # 设置当前模型
            if request.user.role != 'admin':
                return Response({'error': '只有管理员可以更改模型'}, status=status.HTTP_403_FORBIDDEN)
            
            model_name = request.data.get('model')
            if not model_name:
                return Response({'error': '模型名称不能为空'}, status=status.HTTP_400_BAD_REQUEST)
            
            # 更新或创建配置
            config, created = SystemConfig.objects.update_or_create(
                config_key='current_model',
                defaults={
                    'id': str(uuid.uuid4()) if created else F('id'),
                    'config_value': model_name,
                    'config_type': 'string',
                    'description': '当前使用的AI模型',
                    'updated_at': timezone.now()
                }
            )
            
            return Response({'model': model_name})
    
    @action(detail=False, methods=['get'])
    def models(self, request):
        # 返回可用的模型列表
        return Response({
            'models': [
                {'id': 'model1', 'name': 'GPT-3.5'},
                {'id': 'model2', 'name': 'GPT-4'},
                {'id': 'model3', 'name': 'Claude'},
                {'id': 'model4', 'name': 'LLaMA'},
                {'id': 'model5', 'name': 'Qwen'}
            ]
        })