/*
Copyright 2016-2020 Balena Ltd.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

import validEmail = require('@resin.io/valid-email');
import { ExpectedError } from '../errors';

const APPNAME_REGEX = new RegExp(/^[a-zA-Z0-9_-]+$/);
// An regex to detect an IP address, from https://www.regular-expressions.info/ip.html
const IP_REGEX = new RegExp(
	/\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b/,
);
const DOTLOCAL_REGEX = new RegExp(/^([a-zA-Z0-9-]+\.)+local$/);
const UUID_REGEX = new RegExp(/^[0-9a-f]+$/);

export function validateEmail(input: string) {
	if (!validEmail(input)) {
		return 'Email is not valid';
	}

	return true;
}

export function validatePassword(input: string) {
	if (input.length < 8) {
		return 'Password should be 8 characters long';
	}

	return true;
}

export function validateApplicationName(input: string) {
	if (input.length < 4) {
		return 'The fleet name should be at least 4 characters long';
	}

	return APPNAME_REGEX.test(input);
}

export function validateIPAddress(input: string): boolean {
	return IP_REGEX.test(input);
}

export function validateDotLocalUrl(input: string): boolean {
	return DOTLOCAL_REGEX.test(input);
}

export function validateLocalHostnameOrIp(input: string): boolean {
	return validateIPAddress(input) || validateDotLocalUrl(input);
}

export function validateLongUuid(input: string): boolean {
	if (input.length !== 32 && input.length !== 62) {
		return false;
	}
	return UUID_REGEX.test(input);
}

export function validateShortUuid(input: string): boolean {
	if (input.length !== 7) {
		return false;
	}
	return UUID_REGEX.test(input);
}

export function validateUuid(input: string): boolean {
	return validateLongUuid(input) || validateShortUuid(input);
}

export function looksLikeInteger(input: string) {
	// Allow only digits, no leading 0
	return /^(?:0|[1-9][0-9]*)$/.test(input);
}

export function parseAsInteger(input: string, paramName?: string) {
	if (!looksLikeInteger(input)) {
		const message =
			paramName == null
				? 'The parameter must be an integer.'
				: `The parameter '${paramName}' must be an integer.`;

		throw new ExpectedError(message);
	}

	return Number(input);
}

export function tryAsInteger(input: string): number | string {
	try {
		return parseAsInteger(input);
	} catch {
		return input;
	}
}

export function parseAsLocalHostnameOrIp(input: string, paramName?: string) {
	if (input && !validateLocalHostnameOrIp(input)) {
		const message =
			paramName == null
				? 'The parameter must be a local hostname or IP address.'
				: `The parameter '${paramName}' must be a local hostname or IP address.`;

		throw new ExpectedError(message);
	}

	return input;
}

export function looksLikeFleetSlug(input: string) {
	return input.includes('/');
}