"""
设备模块视图 - App端
"""
from rest_framework import viewsets, status
from rest_framework.decorators import action
from rest_framework.permissions import IsAuthenticated, AllowAny

from utils.response import success, error
from utils.exceptions import ErrorCode
from apps.admins.authentication import AppJWTAuthentication
from .models import Device, UserDevice, DeviceType
from .serializers import (
    DeviceSerializer,
    UserDeviceSerializer,
    BindDeviceSerializer,
    DeviceVerifySerializer,
    DeviceTypeSerializer
)


class DeviceViewSet(viewsets.ViewSet):
    """设备视图集（App端）"""
    
    authentication_classes = [AppJWTAuthentication]
    permission_classes = [IsAuthenticated]
    
    @action(detail=False, methods=['get'], url_path='query-by-mac', 
            authentication_classes=[], permission_classes=[AllowAny])
    def query_by_mac(self, request):
        """
        通过MAC地址查询SN码（无需登录）
        GET /api/v1/devices/query-by-mac?mac=AA:BB:CC:DD:EE:FF
        """
        mac = request.query_params.get('mac', '')
        if not mac:
            return error(message='MAC地址不能为空')
        
        # 统一格式
        mac = mac.upper().replace('-', ':')
        
        try:
            device = Device.objects.select_related('device_type').get(mac_address=mac)
            return success(data={
                'sn': device.sn,
                'mac_address': device.mac_address,
                'device_type': DeviceTypeSerializer(device.device_type).data if device.device_type else None,
                'status': device.status,
                'is_bound': device.status == 'bound'
            })
        except Device.DoesNotExist:
            return error(
                code=404, 
                message='未找到对应的设备，请检查MAC地址是否正确或设备是否已完成入库',
                status_code=status.HTTP_404_NOT_FOUND
            )
    
    @action(detail=False, methods=['post'])
    def verify(self, request):
        """
        验证设备SN
        POST /api/v1/devices/verify
        """
        serializer = DeviceVerifySerializer(data=request.data)
        if not serializer.is_valid():
            return error(message=str(serializer.errors))
        
        sn = serializer.validated_data['sn']
        
        try:
            device = Device.objects.select_related('device_type').get(sn=sn)
        except Device.DoesNotExist:
            return error(code=ErrorCode.DEVICE_NOT_FOUND, message='设备不存在')
        
        # 检查是否已被绑定
        is_bindable = device.status != 'bound'
        
        return success(data={
            'sn': device.sn,
            'is_bindable': is_bindable,
            'device_type': DeviceTypeSerializer(device.device_type).data if device.device_type else None
        })
    
    @action(detail=False, methods=['post'])
    def bind(self, request):
        """
        绑定设备
        POST /api/v1/devices/bind
        """
        serializer = BindDeviceSerializer(data=request.data)
        if not serializer.is_valid():
            return error(message=str(serializer.errors))
        
        sn = serializer.validated_data['sn']
        spirit_id = serializer.validated_data.get('spirit_id')
        
        try:
            device = Device.objects.get(sn=sn)
        except Device.DoesNotExist:
            return error(code=ErrorCode.DEVICE_NOT_FOUND, message='设备不存在')
        
        # 检查是否已被绑定
        if device.status == 'bound':
            # 检查是否是当前用户绑定的
            existing = UserDevice.objects.filter(device=device, is_active=True).first()
            if existing and existing.user != request.user:
                return error(code=ErrorCode.DEVICE_ALREADY_BOUND, message='设备已被其他用户绑定')
        
        # 创建绑定关系
        user_device, created = UserDevice.objects.update_or_create(
            user=request.user,
            device=device,
            defaults={
                'spirit_id': spirit_id,
                'is_active': True
            }
        )
        
        # 更新设备状态
        device.status = 'bound'
        device.save()
        
        return success(
            data=UserDeviceSerializer(user_device).data,
            message='绑定成功' if created else '更新绑定成功'
        )
    
    @action(detail=False, methods=['get'])
    def my_devices(self, request):
        """
        我的设备列表
        GET /api/v1/devices/my_devices
        """
        user_devices = UserDevice.objects.filter(
            user=request.user, 
            is_active=True
        ).select_related('device', 'device__device_type', 'spirit')
        
        serializer = UserDeviceSerializer(user_devices, many=True)
        return success(data=serializer.data)
    
    @action(detail=True, methods=['delete'])
    def unbind(self, request, pk=None):
        """
        解绑设备
        DELETE /api/v1/devices/{id}/unbind
        """
        try:
            user_device = UserDevice.objects.get(id=pk, user=request.user)
        except UserDevice.DoesNotExist:
            return error(code=ErrorCode.DEVICE_NOT_FOUND, message='绑定记录不存在')
        
        # 更新绑定状态
        user_device.is_active = False
        user_device.save()
        
        # 检查设备是否还有其他活跃绑定
        active_bindings = UserDevice.objects.filter(device=user_device.device, is_active=True).count()
        if active_bindings == 0:
            user_device.device.status = 'out_stock'
            user_device.device.save()
        
        return success(message='解绑成功')
    
    @action(detail=True, methods=['put'], url_path='update-spirit')
    def update_spirit(self, request, pk=None):
        """
        更新设备绑定的智能体
        PUT /api/v1/devices/{id}/update-spirit
        """
        try:
            user_device = UserDevice.objects.get(id=pk, user=request.user, is_active=True)
        except UserDevice.DoesNotExist:
            return error(code=ErrorCode.DEVICE_NOT_FOUND, message='绑定记录不存在')
        
        spirit_id = request.data.get('spirit_id')
        user_device.spirit_id = spirit_id
        user_device.save()
        
        return success(data=UserDeviceSerializer(user_device).data, message='更新成功')