from rest_framework import serializers
from .models import ESP32Config, Order, Salesperson, Service, VBCourse, ProductFeature, ServiceOrder, WeChatUser, Distributor, Withdrawal

class WeChatUserSerializer(serializers.ModelSerializer):
    class Meta:
        model = WeChatUser
        fields = ['id', 'nickname', 'avatar_url', 'gender', 'country', 'province', 'city']
        read_only_fields = ['id']

class DistributorSerializer(serializers.ModelSerializer):
    user_info = WeChatUserSerializer(source='user', read_only=True)
    
    class Meta:
        model = Distributor
        fields = ['id', 'user_info', 'level', 'commission_rate', 'total_earnings', 'withdrawable_balance', 'status', 'invite_code', 'qr_code_url']
        read_only_fields = ['level', 'commission_rate', 'total_earnings', 'withdrawable_balance', 'status', 'invite_code', 'qr_code_url']

class WithdrawalSerializer(serializers.ModelSerializer):
    class Meta:
        model = Withdrawal
        fields = ['id', 'amount', 'status', 'remark', 'created_at']
        read_only_fields = ['status', 'created_at', 'remark']

class ProductFeatureSerializer(serializers.ModelSerializer):
    """
    产品特性序列化器
    """
    display_icon = serializers.SerializerMethodField()

    class Meta:
        model = ProductFeature
        fields = ['title', 'description', 'icon_name', 'display_icon', 'order']
    
    def get_display_icon(self, obj):
        if obj.icon_url:
            return obj.icon_url
        if obj.icon_image:
            return obj.icon_image.url
        return None

class ServiceSerializer(serializers.ModelSerializer):
    """
    AI服务序列化器
    """
    features_list = serializers.SerializerMethodField()
    display_icon = serializers.SerializerMethodField()
    display_detail_image = serializers.SerializerMethodField()

    class Meta:
        model = Service
        fields = '__all__'

    def get_features_list(self, obj):
        if obj.features:
            return [line.strip() for line in obj.features.split('\n') if line.strip()]
        return []
    
    def get_display_icon(self, obj):
        if obj.icon_url:
            return obj.icon_url
        if obj.icon:
            return obj.icon.url
        return None

    def get_display_detail_image(self, obj):
        if obj.detail_image_url:
            return obj.detail_image_url
        if obj.detail_image:
            return obj.detail_image.url
        return None

class ServiceOrderSerializer(serializers.ModelSerializer):
    """
    AI服务订单序列化器
    """
    service_name = serializers.CharField(source='service.title', read_only=True)
    # 接收前端传来的 ref_code
    ref_code = serializers.CharField(write_only=True, required=False, allow_blank=True)

    class Meta:
        model = ServiceOrder
        fields = ['id', 'service', 'service_name', 'customer_name', 'company_name', 
                  'phone_number', 'email', 'requirements', 'total_price', 'status', 'created_at', 'ref_code']
        read_only_fields = ['total_price', 'status', 'created_at']
    
    def create(self, validated_data):
        ref_code = validated_data.pop('ref_code', None)
        service = validated_data.get('service')
        
        # 默认设置预估总价为服务起步价
        if service:
            validated_data['total_price'] = service.price

        # 尝试关联销售员
        if ref_code:
            try:
                salesperson = Salesperson.objects.get(code=ref_code)
                validated_data['salesperson'] = salesperson
            except Salesperson.DoesNotExist:
                pass

        return super().create(validated_data)

class VBCourseSerializer(serializers.ModelSerializer):
    """
    VB课程序列化器
    """
    display_cover_image = serializers.SerializerMethodField()
    display_detail_image = serializers.SerializerMethodField()
    course_type_display = serializers.CharField(source='get_course_type_display', read_only=True)

    class Meta:
        model = VBCourse
        fields = '__all__'
    
    def get_display_cover_image(self, obj):
        if obj.cover_image_url:
            return obj.cover_image_url
        if obj.cover_image:
            return obj.cover_image.url
        return None

    def get_display_detail_image(self, obj):
        if obj.detail_image_url:
            return obj.detail_image_url
        if obj.detail_image:
            return obj.detail_image.url
        return None

class ESP32ConfigSerializer(serializers.ModelSerializer):
    """
    ESP32配置序列化器
    """
    display_detail_image = serializers.SerializerMethodField()
    features = ProductFeatureSerializer(many=True, read_only=True)

    class Meta:
        model = ESP32Config
        fields = '__all__'
    
    def get_display_detail_image(self, obj):
        if obj.detail_image_url:
            return obj.detail_image_url
        if obj.detail_image:
            return obj.detail_image.url
        return None


class OrderSerializer(serializers.ModelSerializer):
    """
    订单序列化器
    """
    config_name = serializers.CharField(source='config.name', read_only=True)
    config_image = serializers.SerializerMethodField()
    salesperson_name = serializers.CharField(source='salesperson.name', read_only=True)
    salesperson_code = serializers.CharField(source='salesperson.code', read_only=True)
    # 接收前端传来的 ref_code，用于查找 Salesperson
    ref_code = serializers.CharField(write_only=True, required=False, allow_blank=True)
    
    class Meta:
        model = Order
        fields = ['id', 'config', 'config_name', 'config_image', 'quantity', 'total_price', 'status', 'created_at', 'updated_at', 'wechat_trade_no', 
                  'customer_name', 'phone_number', 'shipping_address', 'ref_code', 'salesperson_name', 'salesperson_code', 'courier_name', 'tracking_number']
        read_only_fields = ['total_price', 'status', 'wechat_trade_no', 'created_at', 'updated_at']
        extra_kwargs = {
            'customer_name': {'required': True},
            'phone_number': {'required': True},
            'shipping_address': {'required': True},
        }

    def get_config_image(self, obj):
        if obj.config.static_image_url:
            return obj.config.static_image_url
        if obj.config.detail_image_url:
            return obj.config.detail_image_url
        if obj.config.detail_image:
            return obj.config.detail_image.url
        return None

    def create(self, validated_data):
        """
        重写创建方法，自动计算总价并关联销售员
        """
        config = validated_data.get('config')
        quantity = validated_data.get('quantity', 1)
        ref_code = validated_data.pop('ref_code', None)

        validated_data['total_price'] = config.price * quantity

        # 尝试关联销售员
        if ref_code:
            try:
                salesperson = Salesperson.objects.get(code=ref_code)
                validated_data['salesperson'] = salesperson
            except Salesperson.DoesNotExist:
                # 如果找不到对应的销售员，忽略该推广码，仍继续创建订单（算作自然流量）
                pass

        return super().create(validated_data)