from rest_framework import serializers
from .models import City, Attraction, UserPreference, TravelPlan, DayPlan, DayPlanAttraction
from django.contrib.auth import get_user_model

User = get_user_model()


# class CitySerializer(serializers.ModelSerializer):
#     is_available = serializers.BooleanField(source='is_hot')  # Map is_hot to is_available
#
#     class Meta:
#         model = City
#         fields = ['id', 'name', 'is_available']  # Keep is_available in response
#
#
# class AttractionSerializer(serializers.ModelSerializer):
#     city = CitySerializer(read_only=True)
#
#     class Meta:
#         model = Attraction
#         fields = ['id', 'city', 'name', 'description', 'short_desc', 'address',
#                   'ticket_price', 'open_hours', 'image', 'tags', 'is_featured']
class CitySerializer(serializers.ModelSerializer):
    class Meta:
        model = City
        fields = ['id', 'name', 'code', 'image', 'description']


class AttractionSerializer(serializers.ModelSerializer):
    city = CitySerializer(read_only=True)
    tags = serializers.SerializerMethodField()
    image_url = serializers.SerializerMethodField()

    class Meta:
        model = Attraction
        fields = ['id', 'city', 'name', 'description', 'short_desc', 'address',
                  'ticket_price', 'open_hours', 'image_url', 'tags', 'is_featured']

    def get_tags(self, obj):
        # 确保返回的是列表，即使数据库中是字符串
        if isinstance(obj.tags, str):
            return [tag.strip() for tag in obj.tags.split(',')]
        return obj.tags or []

    def get_image_url(self, obj):
        if obj.image:
            return obj.image.url
        return None


class RedTourismPlanSerializer(serializers.Serializer):
    title = serializers.CharField()
    description = serializers.CharField()
    days = serializers.ListField(child=serializers.DictField())
    red_tourism_tips = serializers.ListField(
        child=serializers.CharField(),
        required=False
    )
    suitable_for = serializers.CharField(
        required=False,
        default="适合党员干部、学生团体等"
    )

    def validate(self, data):
        """验证至少包含2个红色景点"""
        red_attractions = 0
        for day in data.get('days', []):
            for att in day.get('attractions', []):
                if att.get('is_red_tourism', False):
                    red_attractions += 1

        if red_attractions < 2:
            raise serializers.ValidationError("行程必须包含至少2个红色景点")
        return data

class UserPreferenceSerializer(serializers.ModelSerializer):
    cities = CitySerializer(many=True, read_only=True)

    class Meta:
        model = UserPreference
        fields = ['id', 'cities', 'days', 'interests', 'transport', 'custom_requirements']

class DayPlanAttractionSerializer(serializers.ModelSerializer):
    attraction = AttractionSerializer(read_only=True)

    class Meta:
        model = DayPlanAttraction
        fields = ['id', 'attraction', 'order', 'visit_time', 'notes']


class DayPlanSerializer(serializers.ModelSerializer):
    attractions = DayPlanAttractionSerializer(many=True, read_only=True)

    class Meta:
        model = DayPlan
        fields = ['id', 'day', 'theme', 'description', 'transport', 'attractions']


class TravelPlanSerializer(serializers.ModelSerializer):
    day_plans = DayPlanSerializer(many=True, read_only=True)

    class Meta:
        model = TravelPlan
        fields = ['id', 'title', 'description', 'days', 'suitable_for', 'status', 'day_plans', 'created_at']


class TravelPlanCreateSerializer(serializers.ModelSerializer):
    class Meta:
        model = TravelPlan
        fields = ['preference', 'title', 'description', 'days', 'suitable_for']


class UserPreferenceCreateSerializer(serializers.ModelSerializer):
    city_ids = serializers.ListField(
        child=serializers.IntegerField(),
        write_only=True,
        required=True
    )

    class Meta:
        model = UserPreference
        fields = ['city_ids', 'days', 'interests', 'transport', 'custom_requirements']

    def create(self, validated_data):
        city_ids = validated_data.pop('city_ids')
        preference = UserPreference.objects.create(**validated_data)
        preference.cities.set(city_ids)
        return preference