import {
    createValidator,
    IsEmail, // this is a decorator (PascalCase)
    isEmail, // this is a check function, called behavior (camelCase)
    IsString,
    LengthLowerOrEqual,
    validateObject,
} from 'https://deno.land/x/validatte/mod.ts';

// Custom validator with custom error message containing argument. $constraint1 will be replaced by first argument. $constraint2 by second etc...
const IsWhiteListedEmailDomain = createValidator(
    (whiteListedDomain: string) => {
        return (prop) => {
            if (isEmail(prop)) {
                return false;
            }
            return prop.indexOf(`@${whiteListedDomain}`) !== -1;
        };
    },
    'Email shoud be from $constraint1 domain',
);

class User {
    @IsString()
    @IsEmail()
    @IsWhiteListedEmailDomain('mydomain.com')
    email!: string;
}

// ---------- //

// Valid
const user = new User();
user.email = 'myemailmydomain.com';
console.log(validateObject(user, User));
// []

// ---------- //

// Invalid
const failingUser = new User();
failingUser.email = 'wrongemail@email.com';
console.log(validateObject(failingUser, User));

/*
[
    {
        property: 'email',
        errorMessage: `Email shoud be from mydomain.com domain`,
        constraints: ['mydomain.com'],
    },
];
*/