from rest_framework import viewsets, status, permissions
from rest_framework.decorators import action
from rest_framework.response import Response
from django.utils import timezone
from datetime import timedelta
from .models import Meeting, Participant, Message
from .serializers import MeetingSerializer, ParticipantSerializer, MessageSerializer
from django.contrib.auth import get_user_model
from django.shortcuts import get_object_or_404
import uuid

User = get_user_model()


class MeetingViewSet(viewsets.ModelViewSet):
    """会议室视图集"""
    queryset = Meeting.objects.all()
    serializer_class = MeetingSerializer
    permission_classes = []  # 临时开放所有权限
    
    def get_queryset(self):
        return Meeting.objects.all().order_by('-created_at')
    
    def create(self, request, *args, **kwargs):
        """创建会议"""
        serializer = self.get_serializer(data=request.data)
        serializer.is_valid(raise_exception=True)
        
        # 使用第一个用户作为 host
        host = User.objects.first()
        
        meeting = serializer.save(host=host)
        
        # 设置 1 小时过期时间
        meeting.expires_at = timezone.now() + timedelta(hours=1)
        meeting.save()
        
        # 创建主持人参会记录
        Participant.objects.create(
            meeting=meeting,
            user=host,
            agent_type='human',
            nickname=host.username,
            is_host=True
        )
        
        # 处理随行龙虾
        agent_ids = request.data.get('agent_ids', [])
        for agent_id in agent_ids:
            Participant.objects.create(
                meeting=meeting,
                agent_type='openclaw',
                agent_id=agent_id,
                agent_name='Agent',
                agent_emoji='🤖',
                nickname=f'Agent {agent_id}',
                is_host=False
            )
        
        return Response(serializer.data, status=status.HTTP_201_CREATED)
    
    @action(detail=True, methods=['post'])
    def join(self, request, pk=None):
        """加入会议（支持批量加入）"""
        meeting = self.get_object()
        
        # 检查会议是否过期
        if meeting.expires_at and timezone.now() > meeting.expires_at:
            # 过期会议，清空坐席
            meeting.participants.all().delete()
            return Response(
                {'error': '会议已过期，坐席已清空'},
                status=status.HTTP_400_BAD_REQUEST
            )
        
        if meeting.status == 'ended':
            return Response(
                {'error': '会议已结束'},
                status=status.HTTP_400_BAD_REQUEST
            )
        
        invite_code = request.data.get('invite_code')
        if invite_code != meeting.invite_code:
            return Response(
                {'error': '邀请码错误'},
                status=status.HTTP_400_BAD_REQUEST
            )
        
        # 获取要加入的龙虾 ID 列表
        agent_ids = request.data.get('agent_ids', [])
        
        # 获取当前用户
        user = User.objects.first()  # 临时使用第一个用户
        
        # 检查用户是否已加入
        existing = Participant.objects.filter(
            meeting=meeting,
            user=user,
            left_at__isnull=True
        ).first()
        
        if not existing:
            # 用户加入会议
            Participant.objects.create(
                meeting=meeting,
                user=user,
                agent_type='human',
                nickname=user.username if user else '用户',
                is_host=False
            )
        
        # 随行龙虾加入会议
        joined_agents = []
        for agent_id in agent_ids:
            # 检查是否已存在
            exists = Participant.objects.filter(
                meeting=meeting,
                agent_id=agent_id,
                left_at__isnull=True
            ).first()
            
            if not exists:
                participant = Participant.objects.create(
                    meeting=meeting,
                    agent_type='openclaw',
                    agent_id=agent_id,
                    agent_name='Agent',
                    agent_emoji='🤖',
                    nickname=f'Agent {agent_id}',
                    is_host=False
                )
                joined_agents.append(ParticipantSerializer(participant).data)
        
        # 返回所有参会者
        participants = Participant.objects.filter(
            meeting=meeting,
            left_at__isnull=True
        )
        
        return Response({
            'message': '加入成功',
            'participants': ParticipantSerializer(participants, many=True).data,
            'joined_agents': joined_agents
        })
    
    @action(detail=True, methods=['post'])
    def send_message(self, request, pk=None):
        """发送消息"""
        meeting = self.get_object()
        
        # 获取或创建参会者
        participant = Participant.objects.filter(
            meeting=meeting,
            left_at__isnull=True
        ).first()
        
        if not participant:
            host = meeting.host
            participant = Participant.objects.create(
                meeting=meeting,
                user=host,
                agent_type='human',
                nickname=host.username
            )
        
        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
            )
        
        message = Message.objects.create(
            meeting=meeting,
            sender=participant,
            content=content,
            is_broadcast=request.data.get('is_broadcast', True),
            requires_response=request.data.get('requires_response', False)
        )
        
        return Response(MessageSerializer(message).data, status=status.HTTP_201_CREATED)
    
    @action(detail=True, methods=['get'])
    def messages(self, request, pk=None):
        """获取消息"""
        meeting = self.get_object()
        last_id = request.query_params.get('last_id', 0)
        
        messages = meeting.messages.filter(id__gt=last_id).select_related('sender')
        serializer = MessageSerializer(messages, many=True)
        
        return Response({'messages': serializer.data})
    
    @action(detail=True, methods=['get'])
    def participants(self, request, pk=None):
        """获取参会者列表"""
        meeting = self.get_object()
        participants = meeting.participants.filter(left_at__isnull=True)
        serializer = ParticipantSerializer(participants, many=True)
        return Response(serializer.data)