from rest_framework import serializers
from django.contrib.auth import get_user_model

User = get_user_model()

class ChangePasswordSerializer(serializers.Serializer):
    new_password = serializers.CharField(required=True, write_only=True, min_length=4)
    
    def validate_new_password(self, value):
        if len(value) < 4:
            raise serializers.ValidationError("Password must be at least 4 characters long.")
        return value
    
    def update(self, instance, validated_data):
        instance.set_password(validated_data['new_password'])
        instance.save()
        return instance