import { plainToInstance } from "class-transformer";
import { validate } from "class-validator";

async function validateObject(obj) {
  const errors = await validate(obj);
  // errors is an array of validation errors
  if (errors.length > 0) {
    console.log("Validation failed. errors:", errors);
    throw Error(`Validation failed. errors: ${errors}`);
  } else {
    console.log("Validation succeed");
  }
}
// used as decorator
function validateInput(target, propertyKey: string, descriptor: PropertyDescriptor) {
  const method = descriptor.value;
  descriptor.value = async function (...args) {
    const types = Reflect.getMetadata("design:paramtypes", target, propertyKey);
    for (let i = 0; i < args.length; i++) {
      const input = plainToInstance(types[i], args[i], { excludeExtraneousValues: true });
      await validateObject(input);
    }
    return await method.apply(this, args);
  };
}

export { validateObject, validateInput };