export class NgXCookies {

	/**
	 * Gets a  cookie by it's name
	 *
	 * @param  {string} cookieName Name/ID of cookie
	 * @returns Cookies value
	 */
	public static getCookie(cookieName: string): string  {

		let cookieExists = NgXCookies.exists(cookieName);

		if (cookieExists)
		{
			cookieName = encodeURIComponent(cookieName);

			let regexp = new RegExp('(?:^' + cookieName + '|;\\s*' + cookieName + ')=(.*?)(?:;|$)', 'g');
			let cookies = regexp.exec(document.cookie);

			return decodeURIComponent(cookies[1]);
		}
		else {
			return '';
		}
	}

	/**
	 * Sets the Cookie by name
	 *
	 * @param  {string} cookieName Name/ID of cookie
	 * @param  {string} value cookie value
	 * @param  {number} validity expiration date of cookie (default is minutes).
	 * @param  {string} validityType Unit for specifying validity time: days || hours . If left blank, default validity is in minutes
	 * @param  {string} domain Set a specific domain for the cookie to be reachable at
	 * @param  {string} path Path relative to domain
	 * @param  {boolean} needsSecureConnection true/false if cookie can only be accessed through secure
	 */
	public static setCookie(cookieName: string, value: string, validity?: number, validityType?: string, domain?: string, path?: string, needsSecureConnection?: boolean) {

		let cookieStr = encodeURIComponent(cookieName) + '=' + encodeURIComponent(value) + ';';

		/**
		 * Sets validity of cookie
		 */
		if (validity) {

			let fullValidity = validity * 1000 * 60;

			if (validityType == 'days') {
				fullValidity *= (60*24);
			}
			else if (validityType == 'hours') {
				fullValidity *= 60;
			}

			let daysValid = new Date(new Date().getTime() + fullValidity);

			cookieStr += 'expires=' + daysValid.toUTCString() + ';';
		}

		if (path) {
			cookieStr += 'path=' + path + ';';
		}

		if (domain) {
			cookieStr += 'domain=' + domain + ';';
		}

		if (needsSecureConnection) {
			cookieStr += 'secure;';
		}

		document.cookie = cookieStr;
	}

	/**
	 * Deletes a specific cookie
	 *
	 * @param  {string} cookieName Name/ID of cookie
	 * @param  {string} domain Set a specific domain for the cookie to be reachable at
	 * @param  {string} path Path relative to domain
	 */
	public static deleteCookie(cookieName: string, domain?: string, path?: string)
	{

		let cookieExists = NgXCookies.exists(cookieName);

		// If the cookie exists
		if (cookieExists)
		{
			NgXCookies.setCookie(cookieName, '', -1, domain, path);
		}
	}

	/**
	 * Checks if the cookie exists
	 * @param  {string} cookieName Name/ID of cookie
	 * @returns existence of the cookie
	 */
	public static exists(cookieName: string): boolean {

		cookieName = encodeURIComponent(cookieName);

		let regexp = new RegExp('(?:^' + cookieName + '|;\\s*' + cookieName + ')=(.*?)(?:;|$)', 'g');
		let exists = regexp.test(document.cookie);

		return exists;
	}

}