from rest_framework import serializers
from .models import Crop, Variety, Plan


class VarietySerializer(serializers.ModelSerializer):
    class Meta:
        model = Variety
        fields = '__all__'


class CropSerializer(serializers.ModelSerializer):
    varieties = VarietySerializer(many=True, read_only=True)

    class Meta:
        model = Crop
        fields = '__all__'


class PlanSerializer(serializers.ModelSerializer):
    crop_name = serializers.ReadOnlyField(source='crop.name')
    variety_name = serializers.ReadOnlyField(source='variety.name')
    field_name = serializers.ReadOnlyField(source='field.name')

    class Meta:
        model = Plan
        fields = '__all__'
        read_only_fields = ('id', 'created_at', 'updated_at')

    def create(self, validated_data):
        return Plan.objects.create(**validated_data)

    def update(self, instance, validated_data):
        for attr, value in validated_data.items():
            setattr(instance, attr, value)
        instance.save()
        return instance