from rest_framework import serializers

from apps.course.models import (
    Category, Course,
    Comment, CourseComment, LessonComment,
    Material, Lesson,
    Like,
)
from .content import (
    ImageObjectSerializer, ContentSerializer, ContentCreateSerializer,
    GallerySerializer, GalleryImageSerializer,
)

from apps.content.models import (
    Content, Image, Text, ImageText, Video,
    Gallery, GalleryImage, ImageObject,
)

from .user import UserSerializer
from .mixins import DispatchContentMixin, DispatchGalleryMixin, DispatchMaterialMixin


class MaterialCreateSerializer(serializers.ModelSerializer):

    class Meta:
        model = Material
        fields = (
            'id',
            'title',
            'cover',
            'short_description',
            'created_at',
            'update_at',
        )

        read_only_fields = (
            'id',
            'created_at',
            'update_at',
        )


class MaterialSerializer(MaterialCreateSerializer):
    cover = ImageObjectSerializer(allow_null=True)


class LikeSerializer(serializers.ModelSerializer):

    class Meta:
        model = Like
        fields = (
            'id',
            'user',
            'created_at',
            'update_at',
        )

        read_only_fields = (
            'id',
            'created_at',
            'update_at',
        )


class CategorySerializer(serializers.ModelSerializer):

    class Meta:
        model = Category
        fields = (
            'id',
            'title',
        )

        read_only_fields = (
            'id',
        )


class CourseBulkChangeCategorySerializer(serializers.Serializer):
    old_category = serializers.IntegerField()
    new_category = serializers.IntegerField()


class CourseCreateSerializer(DispatchContentMixin,
                             DispatchGalleryMixin,
                             DispatchMaterialMixin,
                             serializers.ModelSerializer
                             ):
    title = serializers.CharField(allow_blank=True)
    short_description = serializers.CharField(allow_blank=True)
    slug = serializers.SlugField(allow_unicode=True, allow_blank=True, allow_null=True, required=False)
    content = serializers.ListSerializer(
        child=ContentCreateSerializer(),
        required=False,
    )
    materials = MaterialSerializer(many=True, required=False)
    gallery = GallerySerializer()

    class Meta:
        model = Course
        fields = (
            'id',
            'slug',
            'author',
            'title',
            'short_description',
            'from_author',
            'cover',
            'price',
            'is_infinite',
            'deferred_start_at',
            'category',
            'duration',
            'is_featured',
            'url',
            'status',
            'likes',
            'materials',
            'created_at',
            'update_at',
            'deactivated_at',
            'content',
            'gallery',
            'lessons',
        )

        read_only_fields = (
            'id',
            'url',
            'lessons',
            'created_at',
            'update_at',
            'deactivated_at',
        )

    def create(self, validated_data):
        content = validated_data.pop('content', [])
        materials = validated_data.pop('materials', [])
        gallery = validated_data.pop('gallery', {})
        author = validated_data.get('author', None)
        if not author:
            validated_data['author'] = self.context['request'].user
        course = super().create(validated_data)
        self.dispatch_content(course, content)
        self.dispatch_materials(course, materials)
        self.dispatch_gallery(course, gallery)
        return course

    def update(self, instance, validated_data):
        content = validated_data.pop('content', [])
        materials = validated_data.pop('materials', [])
        gallery = validated_data.pop('gallery', {})
        author = validated_data.get('author', None)
        if not instance.author or author and instance.author != author:
            validated_data['author'] = self.context['request'].user
        course = super().update(instance, validated_data)
        self.dispatch_materials(course, materials)
        self.dispatch_content(course, content)
        self.dispatch_gallery(course, gallery)
        return course

    def to_representation(self, instance):
        return CourseSerializer(instance=instance, context=self.context).to_representation(instance)


class LessonCreateSerializer(DispatchContentMixin, serializers.ModelSerializer):
    content = serializers.ListSerializer(
        child=ContentCreateSerializer(),
        required=False,
    )

    class Meta:
        model = Lesson
        fields = (
            'id',
            'title',
            'short_description',
            'course',
            'cover',
            'content',
            'created_at',
            'update_at',
            'deactivated_at',
        )

        read_only_fields = (
            'id',
            'created_at',
            'update_at',
            'deactivated_at',
        )

    def create(self, validated_data):
        content = validated_data.pop('content', [])
        lesson = super().create(validated_data)
        self.dispatch_content(lesson, content)
        return lesson

    def update(self, instance, validated_data):
        content = validated_data.pop('content', [])
        lesson = super().update(instance, validated_data)
        self.dispatch_content(lesson, content)
        return lesson

    def to_representation(self, instance):
        return LessonSerializer(instance, context=self.context).to_representation(instance)


class LessonSerializer(serializers.ModelSerializer):
    # course = CourseSerializer()
    cover = ImageObjectSerializer()
    content = ContentSerializer(many=True)

    class Meta:
        model = Lesson
        fields = (
            'id',
            'title',
            'short_description',
            'course',
            'cover',
            'content',
            'created_at',
            'update_at',
            'deactivated_at',
        )

        read_only_fields = (
            'id',
            'created_at',
            'update_at',
            'deactivated_at',
        )


class CourseSerializer(serializers.ModelSerializer):
    author = UserSerializer()
    category = CategorySerializer()
    materials = MaterialSerializer(many=True)
    cover = ImageObjectSerializer()
    gallery = GallerySerializer()
    content = ContentSerializer(many=True)
    lessons = LessonSerializer(many=True)

    class Meta:
        model = Course
        fields = (
            'id',
            'slug',
            'author',
            'title',
            'short_description',
            'from_author',
            'cover',
            'price',
            'is_infinite',
            'deferred_start_at',
            'category',
            'duration',
            'is_featured',
            'url',
            'status',
            'likes',
            'materials',
            'created_at',
            'update_at',
            'deactivated_at',
            'content',
            'gallery',
            'lessons',
        )

        read_only_fields = (
            'id',
            'url',
            'lessons',
            'created_at',
            'update_at',
            'deactivated_at',
        )


class CommentSerializer(serializers.ModelSerializer):
    author = UserSerializer()

    class Meta:
        model = Comment
        fields = (
            'id',
            'content',
            'author',
            'parent',
            'deactivated_at',
            'created_at',
            'update_at',
        )

        read_only_fields = (
            'id',
            'deactivated_at',
            'created_at',
            'update_at',
        )

    def to_representation(self, instance):
        if isinstance(instance, CourseComment):
            return CourseCommentSerializer(instance, context=self.context).to_representation(instance)
        elif isinstance(instance, LessonComment):
            return LessonCommentSerializer(instance, context=self.context).to_representation(instance)


class CourseCommentSerializer(serializers.ModelSerializer):
    author = UserSerializer()
    children = CommentSerializer(many=True)

    class Meta:
        model = CourseComment
        fields = CommentSerializer.Meta.fields + (
            'course',
            'children',
        )

        read_only_fields = CommentSerializer.Meta.read_only_fields + (
            'children',
        )


class LessonCommentSerializer(serializers.ModelSerializer):
    author = UserSerializer()
    children = CommentSerializer(many=True)

    class Meta:
        model = LessonComment
        fields = CommentSerializer.Meta.fields + (
            'lesson',
            'children',
        )

        read_only_fields = CommentSerializer.Meta.read_only_fields + (
            'children',
        )