import {
  registerDecorator,
  ValidationArguments,
  ValidationOptions,
} from 'class-validator';

export function AtLeastOneField(validationOptions?: ValidationOptions) {
  return function (constructor: Function) {
    registerDecorator({
      name: 'atLeastOneField',
      target: constructor,
      propertyName: undefined as any, // important for class-level
      options: validationOptions,
      validator: {
        validate(_: any, args: ValidationArguments) {
          const object = args.object as Record<string, any>;

          return Object.values(object).some((value) => value !== undefined);
        },
        defaultMessage() {
          return 'At least one field must be provided';
        },
      },
    });
  };
}