import * as Assert from 'assert';
import { isWebUri } from 'valid-url';
import { validate as validateEmail } from 'email-validator';
import { isString } from 'lodash';
import { hasTrailingSlash } from './url.utils';

export function assertNotNull(aValue: any, aName?: string) {
    Assert.ok(aValue != null, aName ? `Value [${aName}] must not be null or undefined.` : 'Value must not be null or undefined.');
}

export function assertParameter(aValue: any, aParameterName: string) {
    Assert.ok(!!aValue, `Please specify the '--${aParameterName}' parameter.`);
}

export function isValidUrl(aValue: any): aValue is string {
    return isString(aValue) && !!isWebUri(aValue);
}

export function assertIsUrl(aValue: any, aName?: string): string {
    Assert.ok(isValidUrl(aValue), aName ? `Value [${aName}] must be a valid URL.` : 'Value must be a valid URL.');
    return aValue;
}

export function isValidEmail(aValue: any): aValue is string {
    return isString(aValue) && !!validateEmail(aValue);
}

export function isValidUserName(aValue: any): aValue is string {
    return isString(aValue) && (!!validateEmail(aValue) || (aValue === 'apikey'));
}

export function assertIsEmail(aValue: any, aName?: string): string {
    Assert.ok(isValidEmail(aValue), aName ? `Value [${aName}] must be a valid e-mail address.` : 'Value must be a valid e-mail address.');
    return aValue;
}

export function assertIsValidUserName(aValue: any, aName?: string): string {
    Assert.ok(isValidUserName(aValue), aName
        ? `Value [${aName}] must be a valid e-mail address or the term 'apikey'.`
        : 'Value must be a valid e-mail address or the term \'apikey\'.');
    return aValue;
}

export function assertHasTrailingSlash(aValue: any): string {
    Assert.ok(isValidUrl(aValue) && hasTrailingSlash(aValue), 'URL [${aValue}] must end with a slash.');
    return aValue;
}