zod-backend/src/customer/validators/poi-number.validator.ts

import {
  registerDecorator,
  ValidationOptions,
  ValidatorConstraint,
  ValidatorConstraintInterface,
  ValidationArguments,
} from 'class-validator';
import { PoiType } from '../enums';

@ValidatorConstraint({ name: 'IsValidPoiNumber', async: false })
export class IsValidPoiNumberConstraint implements ValidatorConstraintInterface {
  validate(poiNumber: string, args: ValidationArguments) {
    const object = args.object as any;
    const poiType = object.poiType;

    if (!poiNumber || !poiType) {
      return false;
    }

    // Saudi National ID: 10 digits, typically starts with 1 or 2
    const nationalIdPattern = /^[12]\d{9}$/;

    // Iqama (Resident ID): 10 digits, typically starts with other numbers (not 1 or 2)
    const iqamaPattern = /^[3-9]\d{9}$/;

    if (poiType === PoiType.NAT) {
      return nationalIdPattern.test(poiNumber);
    }

    if (poiType === PoiType.IQA) {
      return iqamaPattern.test(poiNumber);
    }

    return false;
  }

  defaultMessage(args: ValidationArguments) {
    const object = args.object as any;
    const poiType = object.poiType;

    if (poiType === PoiType.NAT) {
      return 'National ID must be 10 digits and start with 1 or 2';
    }

    if (poiType === PoiType.IQA) {
      return 'Iqama number must be 10 digits and start with 3-9';
    }

    return 'Invalid POI number format';
  }
}

export function IsValidPoiNumber(validationOptions?: ValidationOptions) {
  return function (object: Object, propertyName: string) {
    registerDecorator({
      target: object.constructor,
      propertyName: propertyName,
      options: validationOptions,
      constraints: [],
      validator: IsValidPoiNumberConstraint,
    });
  };
}