(function(angular) {
	// Just in case...
	if (!Array.prototype.indexOf) {
		Array.prototype.indexOf = function (searchElement, fromIndex) {
			if ( this === undefined || this === null ) {
				throw new TypeError( '"this" is null or not defined' );
			}

			var length = this.length >>> 0; // Hack to convert object.length to a UInt32

			fromIndex = +fromIndex || 0;

			if (Math.abs(fromIndex) === Infinity) {
				fromIndex = 0;
			}

			if (fromIndex < 0) {
				fromIndex += length;
				if (fromIndex < 0) {
					fromIndex = 0;
				}
			}

			for (;fromIndex < length; fromIndex++) {
				if (this[fromIndex] === searchElement) {
					return fromIndex;
				}
			}

			return -1;
		};
	}
	angular.module('mvdSixpack', [ 'ipCookie' ])
		.provider('sixpack', function() {
			var $body
				, _tests = []
				, _choices = {}
				, _opts = {
					baseUrl: '',
					debug: false,
				}
				, sp = window.sixpack;

			this.setOptions = function (options) {
				angular.extend(_opts, options || {});
			}

			this.$get = ['ipCookie','$timeout', '$log', function(ipCookie, $timeout, $log) {
				var _cookiePrefix = 'sixpack-'
					, _session
					, _clientId;

				var _getOrInitSession = function () {
					if (!_session) {
						if (_clientId = ipCookie(_cookiePrefix + 'clientId')) {
							_session = new sp.Session({client_id:_clientId, base_url:_opts.baseUrl});
						} else {
							_session = new sp.Session({client_id:_opts.client_id, base_url:_opts.baseUrl});
							_clientId = _session.client_id;
							ipCookie(_cookiePrefix + 'clientId', _clientId);
						}
						if (_opts.debug) {
							$log.debug('[sixpack] Initialized session with clientId', _clientId, 'and base url', _opts.baseUrl);
						};
					};
					return _session;
				}

				var methods = {
					participate : function (testName, variations, callback) {
						if (_tests.indexOf(testName) < 0) {
							_tests.push(testName);
						} else if (angular.isDefined(_choices[testName])) {
							var res = _choices[testName];
							if (res === false) {
								// Still loading
								$timeout(function () {
									methods.participate(testName, variations, callback);
								}, 50);
								return;
							};
							if (_opts.debug) {
								$log.info('[sixpack] Using already chosen variation for test', testName, res);
							};
							$timeout(function () {
								callback(res.alternative.name, res);
							});
							return;
						}
						_choices[testName] = false;
						var session = _getOrInitSession();
						if (_opts.debug) {
							$log.info('[sixpack] Getting choice for', testName, 'out of', variations);
						};
						session.participate(testName, variations, function (err, res) {
							if (err) {
								if (_opts.debug) {
									$log.warn('[sixpack] Received error', err);
								};
								$timeout(function () {
									callback(false);
								});
								delete _choices[testName];
								return;
							};
							_choices[testName] = res;
							var choice = res.alternative.name;
							if (_opts.debug) {
								$log.info('[sixpack] Alternative chosen:', choice);
								$log.debug('[sixpack] Full response', res);
							};
							if (!$body) {
								$body = angular.element(document).find('body');
							};
							$body.addClass('sixpack-'+testName+' sixpack-'+testName+'-'+choice);
							$timeout(function() {
								callback(choice, res);
							});
						});
					},
					// Register a 'conversion'. If no testName, will call for all active tests
					// Takes an optional callback that receives the raw response from sixpack (or undefined on error)
					convert : function (testName, kpi, callback) {			
						if (typeof kpi === 'function') {
							callback = kpi;
							kpi = null;
						}
						var session = _getOrInitSession();
						if (!testName) {
							if (_opts.debug) {
								$log.info("[sixpack] Recording conversion for all tests", _tests);
							};
							for (var i = 0, ii = _tests.length; i < ii; i++) {
								var test = _tests[i]
									, results = [];
								session.convert(test, kpi, function (err, res) {
									results.push(res);
									if (err && _opts.debug) {
										$log.warn("[sixpack] Error recording conversion for", test, err);
									};
									if (results.length == ii) {
										if (_opts.debug) {
											$log.debug('[sixpack] All results:', results);
										};
										if (callback) {
											$timeout(function () {
												callback(results);
											});
										}
									};
								});
							}
						} else {
							if (_opts.debug) {
								$log.info("[sixpack] Recording conversion for", testName);
							};
							session.convert(testName, kpi, function (err, res) {
								if (err && _opts.debug) {
									$log.warn('[sixpack] Error recording conversion:', err);
								} else if (_opts.debug) {
									$log.debug('[sixpack] Conversion result:', res);
								};
								if (callback) {
									$timeout(function () {
										callback(res);
									});
								}
							});
						}
					}
				}

				return methods;
			}];
		})
		.directive('sixpackSwitch', ['sixpack', function(sixpack) {
			return {
				controller : ['$element', function($element) {
					var ctrl = this
						, _testName
						// Map of variation names to transclude fns
						, _variations = {};

					var _processChoice = function (choice) {
						// Triggered if for some reason we get an error from sixpack,
						// or optionally if a user is excluded from this test via configuration
						if (!choice) {
							_setContent(_variations['default']);
						} else {
							_setContent(_variations[choice]);
						}
					}

					var _setContent = function (fn) {
						if (!fn) {
							return;
						};
						fn(function(clone) {
							$element.replaceWith(clone);
						});
					}

					// Pseudo-shim for '.keys' method
					// Additionally, if obj has a 'default' property, sets that as the first element
					// so sixpack will use it as the control
					var _keys = function (obj) {
						var keys = []
							, prop;
						for (prop in obj) {
							if (!obj.hasOwnProperty(prop)) {
								continue;
							};
							if (prop == 'default') {
								keys.unshift(prop);
							} else {
								keys.push(prop);
							}
						}
						return keys;
					}

					ctrl.registerSwitch = function (name) {
						_testName = name;
						sixpack.participate(_testName, _keys(_variations), _processChoice);
					}

					ctrl.registerVariation = function (variation, fn) {
						_variations[variation] = fn;
					}

					return ctrl;
				}],
				require: 'sixpackSwitch',
				link : function ($scope, $element, $attrs, ctrl) {
					ctrl.registerSwitch($attrs.sixpackSwitch);
				}
			}
		}])
		// Register a variation for a test
		.directive('sixpackWhen', ['$log', function ($log) {
			return {
				require: '^sixpackSwitch',
				transclude: 'element',
				link: function($scope, $element, $attrs, ctrl, transcludeFn) {
					if ($attrs.sixpackWhen) {
						ctrl.registerVariation($attrs.sixpackWhen, transcludeFn);
					} else {
						$log.debug('[sixpack] When directive initialized without a name, ignoring');
					}
				}
			}
		}])
		// Register the 'default view, registered as the control variation, and
		// always used if sixpack errors out or if user is excluded via configuration
		.directive('sixpackDefault', function () {
			return {
				require: '^sixpackSwitch',
				transclude: 'element',
				link: function($scope, $element, $attrs, ctrl, transcludeFn) {
					ctrl.registerVariation('default', transcludeFn);
				}
			}
		})
		.directive('sixpackConvert', ['sixpack', function (sixpack) {
			return {
				link : function ($scope, $element, $attrs) {
					var test = $attrs.sixpackConvert || undefined
						, eventType = $attrs.on || 'click';

					$element.on(eventType, function () {
						sixpack.convert(test);
					});
				}
			}
		}]);
})(window.angular, window.sixpack);