'use strict';

angular.module('Authentication',[])

.factory('AuthenticationService',
		['Base64', '$http', '$cookieStore', '$rootScope', '$timeout',
		function (Base64, $http, $cookieStore, $rootScope, $timeout) {
				var service = {};

				service.Login = function (username, password, callback) {

						/* Dummy authentication for testing, uses $timeout to simulate api call
						 ----------------------------------------------*/
						$timeout(function(){
								var response = { success: username === 'test' && password === 'test' };
								if(!response.success) {
										response.message = 'Username or password is incorrect';
								}
								callback(response);
						}, 1000);


						/* Use this for real authentication
						 ----------------------------------------------*/
						//$http.post('/api/authenticate', { username: username, password: password })
						//		.success(function (response) {
						//				callback(response);
						//		});

				};

				service.SetCredentials = function (username, password) {
						var authdata = Base64.encode(username + ':' + password);

						$rootScope.globals = {
								currentUser: {
										username: username,
										authdata: authdata
								}
						};

						$http.defaults.headers.common['Authorization'] = 'Basic ' + authdata; // jshint ignore:line
						$cookieStore.put('globals', $rootScope.globals);
				};

				service.ClearCredentials = function () {
						$rootScope.globals = {};
						$cookieStore.remove('globals');
						$http.defaults.headers.common.Authorization = 'Basic ';
				};

				return service;
		}])

.factory('Base64', function () {
		/* jshint ignore:start */

		var keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';

		return {
				encode: function (input) {
						var output = "";
						var chr1, chr2, chr3 = "";
						var enc1, enc2, enc3, enc4 = "";
						var i = 0;

						do {
								chr1 = input.charCodeAt(i++);
								chr2 = input.charCodeAt(i++);
								chr3 = input.charCodeAt(i++);

								enc1 = chr1 >> 2;
								enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
								enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
								enc4 = chr3 & 63;

								if (isNaN(chr2)) {
										enc3 = enc4 = 64;
								} else if (isNaN(chr3)) {
										enc4 = 64;
								}

								output = output +
										keyStr.charAt(enc1) +
										keyStr.charAt(enc2) +
										keyStr.charAt(enc3) +
										keyStr.charAt(enc4);
								chr1 = chr2 = chr3 = "";
								enc1 = enc2 = enc3 = enc4 = "";
						} while (i < input.length);

						return output;
				},

				decode: function (input) {
						var output = "";
						var chr1, chr2, chr3 = "";
						var enc1, enc2, enc3, enc4 = "";
						var i = 0;

						// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
						var base64test = /[^A-Za-z0-9\+\/\=]/g;
						if (base64test.exec(input)) {
								window.alert("There were invalid base64 characters in the input text.\n" +
										"Valid base64 characters are A-Z, a-z, 0-9, '+', '/',and '='\n" +
										"Expect errors in decoding.");
						}
						input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

						do {
								enc1 = keyStr.indexOf(input.charAt(i++));
								enc2 = keyStr.indexOf(input.charAt(i++));
								enc3 = keyStr.indexOf(input.charAt(i++));
								enc4 = keyStr.indexOf(input.charAt(i++));

								chr1 = (enc1 << 2) | (enc2 >> 4);
								chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
								chr3 = ((enc3 & 3) << 6) | enc4;

								output = output + String.fromCharCode(chr1);

								if (enc3 != 64) {
										output = output + String.fromCharCode(chr2);
								}
								if (enc4 != 64) {
										output = output + String.fromCharCode(chr3);
								}

								chr1 = chr2 = chr3 = "";
								enc1 = enc2 = enc3 = enc4 = "";

						} while (i < input.length);

						return output;
				}
		};

		/* jshint ignore:end */
});