from rest_framework import serializers
from .models import City, Attraction
from django.contrib.auth import get_user_model
from django.conf import settings
from .models import RedTourismPlan, RedTourismDayPlan, RedTourismSpot
User = get_user_model()


class CitySerializer(serializers.ModelSerializer):
    class Meta:
        model = City
        fields = ['id', 'name', 'code', 'image', 'description', 'latitude', 'longitude']




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',
                'latitude', 'longitude']

    def get_tags(self, obj):
        if isinstance(obj.tags, str):
            return [tag.strip() for tag in obj.tags.split(',')]
        return obj.tags or []

    def get_image_url(self, obj):
        # 确保使用正确的媒体URL
        if obj.image:
            return self.context['request'].build_absolute_uri(obj.image.url)
        return f"{settings.MEDIA_URL}attractions/{obj.name}.png"



# class RedTourismPlanSerializer(serializers.Serializer):
#     plan_id = serializers.IntegerField(required=False, allow_null=True)
#     city_ids = serializers.ListField(
#         child=serializers.IntegerField(),
#         required=True
#     )
#     days = serializers.IntegerField(min_value=1, max_value=7, required=True)
#     interests = serializers.ListField(
#         child=serializers.CharField(),
#         required=True
#     )
#     transport = serializers.CharField(required=True)
#     custom_requirements = serializers.CharField(required=False, allow_blank=True)
#     previous_plan = serializers.DictField(required=False, default=dict)
#     cities = CitySerializer(many=True, read_only=True)


class RedTourismSpotSerializer(serializers.ModelSerializer):
    class Meta:
        model = RedTourismSpot
        fields = '__all__'


class RedTourismDayPlanSerializer(serializers.ModelSerializer):
    spots = RedTourismSpotSerializer(many=True, read_only=True)

    class Meta:
        model = RedTourismDayPlan
        fields = '__all__'


class RedTourismPlanSerializer(serializers.ModelSerializer):
    day_plans = RedTourismDayPlanSerializer(many=True, read_only=True)
    cities = CitySerializer(many=True, read_only=True)
    created_at = serializers.DateTimeField(format="%Y-%m-%d")  # 格式化日期

    class Meta:
        model = RedTourismPlan
        fields = '__all__'
        read_only_fields = ('user', 'created_at', 'last_updated')


# serializers.py
class SaveRedTourismPlanSerializer(serializers.Serializer):
    plan_data = serializers.JSONField()
    city_ids = serializers.ListField(
        child=serializers.IntegerField(),
        required=True
    )

    def validate_plan_data(self, value):
        required_fields = ['title', 'description', 'days', 'statistics']
        for field in required_fields:
            if field not in value:
                raise serializers.ValidationError(f"缺少必要字段: {field}")
        return value

    def validate_city_ids(self, value):
        if not value:
            raise serializers.ValidationError("至少需要一个城市ID")
        return value


# serializers.py
from rest_framework import serializers


class RedTourismRegenerateSerializer(serializers.Serializer):
    plan_id = serializers.IntegerField(required=False, allow_null=True)
    city_ids = serializers.ListField(
        child=serializers.IntegerField(),
        required=True
    )
    days = serializers.IntegerField(min_value=1, max_value=7, required=True)
    interests = serializers.ListField(
        child=serializers.CharField(),
        required=True
    )
    transport = serializers.ChoiceField(
        choices=['public', 'drive', 'walk', 'bike'],
        required=True
    )
    custom_requirements = serializers.CharField(required=False, allow_blank=True)
    previous_plan = serializers.DictField(required=True)

    def validate_previous_plan(self, value):
        """验证previous_plan字段的结构"""
        if not isinstance(value, dict):
            raise serializers.ValidationError("previous_plan必须是字典")

        # 确保有days字段
        if 'days' not in value:
            raise serializers.ValidationError("previous_plan必须包含days字段")

        if not isinstance(value['days'], list):
            raise serializers.ValidationError("previous_plan.days必须是列表")

        return value