from rest_framework import serializers
from .models import Region, ModeratorApplication, ModeratorPermission
from users.serializers import UserSerializer


class RegionSerializer(serializers.ModelSerializer):
    parent = serializers.PrimaryKeyRelatedField(read_only=True)
    children_count = serializers.SerializerMethodField()
    
    class Meta:
        model = Region
        fields = [
            'id', 'name', 'level', 'parent', 'code', 'description',
            'is_active', 'created_at', 'children_count'
        ]
        read_only_fields = ['created_at']
    
    def get_children_count(self, obj):
        return obj.children.count()


class RegionDetailSerializer(serializers.ModelSerializer):
    parent = RegionSerializer(read_only=True)
    children = RegionSerializer(many=True, read_only=True)
    articles_count = serializers.SerializerMethodField()
    services_count = serializers.SerializerMethodField()
    
    class Meta:
        model = Region
        fields = [
            'id', 'name', 'level', 'parent', 'children', 'code', 'description',
            'is_active', 'created_at', 'articles_count', 'services_count'
        ]
    
    def get_articles_count(self, obj):
        return obj.articles.filter(publish_status='published').count()
    
    def get_services_count(self, obj):
        return obj.featured_services.filter(publish_status='published').count()


class ModeratorApplicationSerializer(serializers.ModelSerializer):
    applicant = UserSerializer(read_only=True)
    region = RegionSerializer(read_only=True)
    
    class Meta:
        model = ModeratorApplication
        fields = [
            'id', 'applicant', 'region', 'application_reason',
            'support_count', 'required_support', 'deadline',
            'status', 'created_at'
        ]
        read_only_fields = ['applicant', 'support_count', 'status', 'created_at']


class ModeratorPermissionSerializer(serializers.ModelSerializer):
    moderator = UserSerializer(read_only=True)
    region = RegionSerializer(read_only=True)
    
    class Meta:
        model = ModeratorPermission
        fields = ['id', 'moderator', 'region', 'rank', 'status', 'created_at']
        read_only_fields = ['created_at']