from .models import *
from rest_framework import serializers
from django.utils import timezone
from datetime import  timedelta





class DetailSerializer(serializers.ModelSerializer):
    class Meta:
        model = DetailModel
        fields = '__all__'

class ProductDetailSerializer(serializers.ModelSerializer):
    detail = DetailSerializer(many=True, read_only=True)
    class Meta:
        model = ProductDetailModel
        exclude = ('product',)



class DynamicProductSerializer(serializers.ModelSerializer):

    price = serializers.SerializerMethodField()
    is_new = serializers.SerializerMethodField()
    related_products = serializers.SerializerMethodField()
    details = ProductDetailSerializer(many=True, read_only=True)
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        view_type = self.context.get('view_type', 'all')
        if view_type != 'all':
            allowed_fields = self.Meta.view_type[view_type]
            allowed = set(allowed_fields)
            existing = set(self.fields.keys())
            
            for field_name in existing - allowed:
                self.fields.pop(field_name)


    class Meta:
        model = ProductModel
        fields = "__all__"
        view_type = {
            'list': ['name', 'price', 'image1', 'video', 'rating', 'discount', 'slug', 'category', ],
            'instance': ['name', 'description', 'price', 'image1', 'image2', 'image3', 'video', 'rating', 'discount', 'slug', 'meta_description', 'meta_keywords', 'meta_rating', 'category', 'related_products', 'details', 'in_pack_items'],
            'chat': ['name', 'description', 'price', 'in_stock', 'discount', ]
        }
        
    def get_price(self, obj):
        dollor_price = self.context.get('dollor_price')
        toman_price = obj.get_toman_price(dollor_price=dollor_price)
        return "{:,.0f} تومان".format(toman_price)

    def get_is_new(self, obj):
        return timezone.now() < obj.created_at + timedelta(days=7)

    def get_related_products(self, obj):  
        if obj.related_products.all().count() >= 5:
            related_products = obj.related_products.all()
        else:
            related_products = obj.category.products
        serializer = DynamicProductSerializer(
            related_products,
            many=True,
            context={
                'view_type': 'list',
                'dollor_price': self.context.get('dollor_price')
            }
        )
        return serializer.data


class CommentSerializer(serializers.ModelSerializer):
    class Meta:
        model = CommentModel
        fields = "__all__"
        read_only_fields = ('show', 'product', 'user')

class SubCategorySerializer(serializers.ModelSerializer):
    product_count = serializers.SerializerMethodField()
    parent = serializers.SerializerMethodField()
    class Meta:
        model = SubCategoryModel
        fields = ['id', 'name', 'slug','icon', 'meta_title', 'meta_description', 'product_count', 'show', 'parent', 'image']
    def get_product_count(self, obj):
        return obj.products.count()
    def get_parent(self, obj):
        return obj.parent.name


class MainCategorySerializer(serializers.ModelSerializer):
    subcategorys = SubCategorySerializer(many=True)
    class Meta:
        model = MainCategoryModel
        fields = ['id', 'name', 'slug', 'icon', 'meta_title', 'meta_description', 'subcategorys']