"use strict";

angular.module("ui.multiselect", ["multiselect.tpl.html"])
	//from bootstrap-ui typeahead parser
	.factory("optionParser", ["$parse", function($parse) {
		//                      00000111000000000000022200000000000000003333333333333330000000000044000
		var TYPEAHEAD_REGEXP = /^\s*(.*?)(?:\s+as\s+(.*?))?\s+for\s+(?:([\$\w][\$\w\d]*))\s+in\s+(.*)$/;

		return {
			parse: function(input) {

				var match = input.match(TYPEAHEAD_REGEXP);
				if(!match) {
					throw new Error("Expected typeahead specification in form of '_modelValue_ (as _label_)? for _item_ in _collection_'" + " but got '" + input + "'.");
				}

				return {
					itemName   : match[3],
					source     : $parse(match[4]),
					viewMapper : $parse(match[2] || match[1]),
					modelMapper: $parse(match[1])
				};
			}
		};
	}])
	.directive("multiselect", ["$parse", "$document", "$compile", "$interpolate", "optionParser", function($parse, $document, $compile, $interpolate, optionParser) {
		return {
			restrict: "E",
			require : "ngModel",
			link    : function(originalScope, element, attrs, modelCtrl) {

				var exp = attrs.options;
				var parsedResult = optionParser.parse(exp);
				var isMultiple = attrs.multiple ? true : false;
				var compareByKey = attrs.compareBy;
				var scrollAfterRows = attrs.scrollAfterRows;
				var required = false;
				var scope = originalScope.$new();
				var changeHandler = attrs.change || angular.noop;

				scope.items = [];
				scope.header = "Select";
				scope.multiple = isMultiple;
				scope.disabled = false;

				scope.ulStyle = {};
				if(scrollAfterRows !== undefined && parseInt(scrollAfterRows).toString() === scrollAfterRows) {
					scope.ulStyle = {"max-height": (scrollAfterRows*26+10)+"px", "overflow-y": "auto"};
				}

				originalScope.$on("$destroy", function() {
					scope.$destroy();
				});

				var popUpEl = angular.element("<multiselect-popup></multiselect-popup>");

				//required validator
				if(attrs.required || attrs.ngRequired) {
					required = true;
				}
				attrs.$observe("required", function(newVal) {
					required = newVal;
				});

				//watch disabled state
				scope.$watch(function() {
					return $parse(attrs.disabled)(originalScope);
				}, function(newVal) {
					scope.disabled = newVal;
				});

				//watch single/multiple state for dynamically change single to multiple
				scope.$watch(function() {
					return $parse(attrs.multiple)(originalScope);
				}, function(newVal) {
					isMultiple = newVal || false;
				});

				//watch option changes for options that are populated dynamically
				scope.$watch(function() {
					return parsedResult.source(originalScope);
				}, function(newVal) {
					if(angular.isDefined(newVal)) {
						parseModel();
					}
				}, true);

				//watch model change
				scope.$watch(function() {
					return modelCtrl.$modelValue;
				}, function(newVal, oldVal) {
					//when directive initialize, newVal usually undefined. Also, if model value already set in the controller
					//for preselected list then we need to mark checked in our scope item. But we don't want to do this every time
					//model changes. We need to do this only if it is done outside directive scope, from controller, for example.
					if(angular.isDefined(newVal)) {
						markChecked(newVal);
						scope.$eval(changeHandler);
					}
					getHeaderText();
					modelCtrl.$setValidity("required", scope.valid());
				}, true);

				function parseModel() {
					scope.items.length = 0;
					var model = parsedResult.source(originalScope);
					if(!angular.isDefined(model) || model === null) {
						return;
					}
					for(var i = 0; i < model.length; i++) {
						var local = {};
						local[parsedResult.itemName] = model[i];
						scope.items.push({
							label  : parsedResult.viewMapper(local),
							model  : model[i],
							checked: false
						});
					}
				}

				parseModel();

				element.append($compile(popUpEl)(scope));

				function getHeaderText() {
					if(isEmpty(modelCtrl.$modelValue)) {
						scope.header = attrs.msHeader || "Select";
						return scope.header;
					}

					if(isMultiple) {
						if(attrs.msSelected) {
							scope.header = $interpolate(attrs.msSelected)(scope);
						} else {
							scope.header = modelCtrl.$modelValue.length + " " + "selected";
						}

					} else {
						var local = {};
						local[parsedResult.itemName] = modelCtrl.$modelValue;
						scope.header = parsedResult.viewMapper(local);
					}
				}

				function isEmpty(obj) {
					if(obj === true || obj === false) {
						return false;
					}
					if(!obj) {
						return true;
					}
					if(obj.length && obj.length > 0) {
						return false;
					}
					for(var prop in obj) {
						if(obj[prop]) {
							return false;
						}
					}
					if(compareByKey !== undefined && obj[compareByKey] !== undefined) {
						return false;
					}

					return true;
				}

				scope.valid = function validModel() {
					if(!required) {
						return true;
					}
					var value = modelCtrl.$modelValue;
					return (angular.isArray(value) && value.length > 0) || (!angular.isArray(value) && value !== null);
				};

				function selectSingle(item) {
					if(!item.checked) {
						scope.uncheckAll();
						item.checked = !item.checked;
					}
					setModelValue(false);
				}

				function selectMultiple(item) {
					item.checked = !item.checked;
					setModelValue(true);
				}

				function setModelValue(isMultiple) {
					var value;

					if(isMultiple) {
						value = [];
						angular.forEach(scope.items, function(item) {
							if(item.checked) {
								value.push(item.model);
							}
						});
					} else {
						angular.forEach(scope.items, function(item) {
							if(item.checked) {
								value = item.model;
								return false;
							}
						});
					}
					modelCtrl.$setViewValue(value);
				}

				function markChecked(newVal) {
					if(!angular.isArray(newVal)) {
						angular.forEach(scope.items, function(item) {
							item.checked = false;
							if(compareByKey === undefined && angular.equals(item.model, newVal)) {
								item.checked = true;
							} else if(compareByKey !== undefined && angular.equals(item.model[compareByKey], newVal[compareByKey])) {
								item.checked = true;
							}
						});
					} else {
						angular.forEach(scope.items, function(item) {
							item.checked = false;
							angular.forEach(newVal, function(i) {
								if(compareByKey === undefined && angular.equals(item.model, i)) {
									item.checked = true;
								} else if(compareByKey !== undefined && angular.equals(item.model[compareByKey], i[compareByKey])) {
									item.checked = true;
								}
							});
						});
					}
				}

				scope.checkAll = function() {
					if(!isMultiple) {
						return;
					}
					angular.forEach(scope.items, function(item) {
						item.checked = true;
					});
					setModelValue(true);
				};

				scope.uncheckAll = function() {
					angular.forEach(scope.items, function(item) {
						item.checked = false;
					});
					setModelValue(true);
				};

				scope.select = function(event, item) {
					if(isMultiple === false) {
						selectSingle(item);
						scope.toggleSelect();
					} else {
						event.stopPropagation();
						selectMultiple(item);
					}
				};
			}
		};
	}])
	.directive("multiselectPopup", ["$document", function($document) {
		return {
			restrict   : "E",
			scope      : false,
			replace    : true,
			templateUrl: "multiselect.tpl.html",
			link       : function(scope, element, attrs) {

				scope.isVisible = false;

				scope.toggleSelect = function() {
					if(element.hasClass("open")) {
						element.removeClass("open");
						$document.unbind("click", clickHandler);
					} else {
						element.addClass("open");
						$document.bind("click", clickHandler);
					}
				};

				//				$("ul.dropdown-menu").on("click", "[data-stopPropagation]", function(e) {
				//					e.stopPropagation();
				//				});

				function clickHandler(event) {
					if(elementMatchesAnyInArray(event.target, element.find(event.target.tagName))) {
						return;
					}
					element.removeClass("open");
					$document.unbind("click", clickHandler);
					scope.$apply();
				}

				var elementMatchesAnyInArray = function(element, elementArray) {
					for(var i = 0; i < elementArray.length; i++) {
						if(element === elementArray[i]) {
							return true;
						}
					}
					return false;
				};
			}
		};
	}]);

angular.module("multiselect.tpl.html", []).run(["$templateCache", function($templateCache) {
	$templateCache.put("multiselect.tpl.html",
			"<div class=\"btn-group\">\n" +
			"  <button type=\"button\" class=\"btn btn-default dropdown-toggle\" ng-click=\"toggleSelect()\" ng-disabled=\"disabled\" ng-class=\"{'error': !valid()}\">\n" +
			"    {{header}} <span class=\"caret\"></span>\n" +
			"  </button>\n" +
			"  <ul class=\"dropdown-menu\" style=\"margin-bottom:30px;padding-left:5px;padding-right:5px;\" ng-style=\"ulStyle\">\n" +
			"    <li data-stopPropagation=\"true\" ng-repeat=\"i in items\">\n" +
			"      <a ng-click=\"select($event, i)\" style=\"padding:3px 10px;cursor:pointer;\">\n" +
			"        <i class=\"glyphicon\" ng-class=\"{'glyphicon-ok': i.checked, 'empty': !i.checked}\"></i> {{i.label}}</a>\n" +
			"    </li>\n" +
			"  </ul>\n" +
			"</div>");
}]);