import {
  validate,
  validateOrReject,
  Contains,
  IsInt,
  Length,
  IsEmail,
  IsFQDN,
  IsDate,
  Min,
  Max,
} from "class-validator";

export class Post {
  @Length(10, 20)
  title: string;

  @Contains("hello")
  text: string;

  @IsInt()
  @Min(0)
  @Max(10)
  rating: number;

  @IsEmail()
  email: string;

  @IsFQDN()
  site: string;

  @IsDate()
  createDate: Date;
}

let post = new Post();
post.title = "Hello"; // should not pass
post.text = "this is a great post about hell world"; // should not pass
post.rating = 11; // should not pass
post.email = "google.com"; // should not pass
post.site = "googlecom"; // should not pass

validate(post).then((errors) => {
  // errors is an array of validation errors
  if (errors.length > 0) {
    console.log("validation failed. errors: ", errors);
  } else {
    console.log("validation succeed");
  }
});

validateOrReject(post).catch((errors) => {
  console.log("Promise rejected (validation failed). Errors: ", errors);
});
// or
async function validateOrRejectExample(input) {
  try {
    await validateOrReject(input);
  } catch (errors) {
    console.log(
      "Caught promise rejection (validation failed). Errors: ",
      errors
    );
  }
}