from rest_framework import serializers
from utils import FileFieldSerializer
from .models import Blog, BlogContent


class BlogContentSerializer(serializers.ModelSerializer):
    """
    Serializer for BlogContent model with all details
    """
    image = FileFieldSerializer(required=False, allow_null=True)
    title = serializers.SerializerMethodField()
    content = serializers.SerializerMethodField()
    slug = serializers.SerializerMethodField()
    
    class Meta:
        model = BlogContent
        fields = [
            'id',
            'title',
            'content',
            'slug',
            'image',
            'order',
            'created_at',
            'updated_at'
        ]
        read_only_fields = ['id', 'created_at', 'updated_at']

    def _lang(self):
        request = self.context.get('request')
        return getattr(request, 'LANGUAGE_CODE', None) or 'en'

    def get_title(self, obj: BlogContent):
        return obj.blog.get_blog_filed(self._lang(), obj.title)

    def get_content(self, obj: BlogContent):
        return obj.blog.get_blog_filed(self._lang(), obj.content)

    def get_slug(self, obj: BlogContent):
        return obj.blog.get_blog_filed(self._lang(), obj.slug)


class BlogListSerializer(serializers.ModelSerializer):
    """
    Serializer for Blog list view with file field for thumbnail
    """
    thumbnail = FileFieldSerializer(required=False)
    title = serializers.SerializerMethodField()
    slogan = serializers.SerializerMethodField()
    summary = serializers.SerializerMethodField()
    slug = serializers.SerializerMethodField()
    seo = serializers.SerializerMethodField()
    
    class Meta:
        model = Blog
        fields = [
            'id',
            'title',
            'thumbnail',
            'slogan',
            'summary',
            'views_count',
            'slug',
            'seo',
            'created_at',
            'updated_at'
        ]
        read_only_fields = ['id', 'views_count', 'created_at', 'updated_at']

    def _lang(self):
        request = self.context.get('request')
        return getattr(request, 'LANGUAGE_CODE', None) or 'en'

    def get_title(self, obj: Blog):
        return obj.get_blog_filed(self._lang(), obj.title)

    def get_slogan(self, obj: Blog):
        return obj.get_blog_filed(self._lang(), obj.slogan)

    def get_summary(self, obj: Blog):
        return obj.get_blog_filed(self._lang(), obj.summary)

    def get_slug(self, obj: Blog):
        return obj.get_blog_filed(self._lang(), obj.slug)

    def get_seo(self, obj: Blog):
        return obj.get_seo_for_language(self._lang())


class BlogDetailSerializer(serializers.ModelSerializer):
    """
    Serializer for Blog detail view with related BlogContent
    """
    thumbnail = FileFieldSerializer(required=False)
    contents = serializers.SerializerMethodField()
    title = serializers.SerializerMethodField()
    slogan = serializers.SerializerMethodField()
    summary = serializers.SerializerMethodField()
    slug = serializers.SerializerMethodField()
    seo = serializers.SerializerMethodField()
    
    class Meta:
        model = Blog
        fields = [
            'id',
            'title',
            'thumbnail',
            'slogan',
            'summary',
            'views_count',
            'slug',
            'seo',
            'created_at',
            'updated_at',
            'contents'
        ]
    def get_contents(self, obj: Blog):
        # Pass down context (request) to nested serializer
        ser = BlogContentSerializer(obj.contents.all().order_by('order'), many=True, context=self.context)
        return ser.data
        read_only_fields = ['id', 'views_count', 'created_at', 'updated_at']

    def _lang(self):
        request = self.context.get('request')
        return getattr(request, 'LANGUAGE_CODE', None) or 'en'

    def get_title(self, obj: Blog):
        return obj.get_blog_filed(self._lang(), obj.title)

    def get_slogan(self, obj: Blog):
        return obj.get_blog_filed(self._lang(), obj.slogan)

    def get_summary(self, obj: Blog):
        return obj.get_blog_filed(self._lang(), obj.summary)

    def get_slug(self, obj: Blog):
        return obj.get_blog_filed(self._lang(), obj.slug)

    def get_seo(self, obj: Blog):
        return obj.get_seo_for_language(self._lang())