/*
 * SimplePubSub from https://github.com/mbenford/ngTagsInput/blob/master/src/util.js
 * */
'use strict';

function SimplePubSub() {
    var events = {};
    return {
        on: function (names, handler) {
            names.split(' ').forEach(function (name) {
                if (!events[name]) {
                    events[name] = [];
                }
                events[name].push(handler);
            });
            return this;
        },
        trigger: function (name, args) {
            angular.forEach(events[name], function (handler) {
                handler.call(null, args);
            });
            return this;
        }
    };
};

angular.module('tabSlideBox', [])
.directive('onFinishRender', function ($timeout) {
    return {
        restrict: 'A',
        link: function (scope, element, attr) {
            if (scope.$last === true) {
                $timeout(function () {
                    scope.$emit('ngRepeatFinished');
                });
            }
        }
    }
})
.directive('tabSlideBox', ['$timeout', '$window', '$ionicSlideBoxDelegate', '$ionicScrollDelegate',
	function ($timeout, $window, $ionicSlideBoxDelegate, $ionicScrollDelegate) {
	    'use strict';

	    return {
	        restrict: 'A, E, C',
	        link: function (scope, element, attrs, ngModel) {

	            var ta = element[0], $ta = element;
	            $ta.addClass("tabbed-slidebox");
	            if (attrs.tabsPosition === "bottom") {
	                $ta.addClass("btm");
	            }

	            //Handle multiple slide/scroll boxes
	            var handle = ta.querySelector('.slider').getAttribute('delegate-handle');

	            var ionicSlideBoxDelegate = $ionicSlideBoxDelegate;
	            if (handle) {
	                ionicSlideBoxDelegate = ionicSlideBoxDelegate.$getByHandle(handle);
	            }

	            var ionicScrollDelegate = $ionicScrollDelegate;
	            if (handle) {
	                ionicScrollDelegate = ionicScrollDelegate.$getByHandle(handle);
	            }

	            function renderScrollableTabs() {
	                var iconsDiv = angular.element(ta.querySelector(".tsb-icons")), icons = iconsDiv.find("a"), wrap = iconsDiv[0].querySelector(".tsb-ic-wrp"), totalTabs = icons.length;
	                var scrollDiv = wrap.querySelector(".scroll");

	                angular.forEach(icons, function (value, key) {
	                    var a = angular.element(value);
	                    a.on('click', function () {
	                        ionicSlideBoxDelegate.slide(key);
	                    });

	                    if (a.attr('icon-off')) {
	                        a.attr("class", a.attr('icon-off'));
	                    }
	                });

	                var initialIndex = attrs.tab;
	                //Initializing the middle tab
	                if (typeof attrs.tab === 'undefined' || (totalTabs <= initialIndex) || initialIndex < 0) {
	                    initialIndex = Math.floor(icons.length / 2);
	                }

	                //If initial element is 0, set position of the tab to 0th tab 
	                if (initialIndex == 0) {
	                    setPosition(0);
	                }

	                $timeout(function () {
	                    ionicSlideBoxDelegate.slide(initialIndex);
	                }, 0);
	                
	            }
	            function setPosition(index) {
	                var iconsDiv = angular.element(ta.querySelector(".tsb-icons")), icons = iconsDiv.find("a"), wrap = iconsDiv[0].querySelector(".tsb-ic-wrp"), totalTabs = icons.length;
	                var scrollDiv = wrap.querySelector(".scroll");

	                var middle = iconsDiv[0].offsetWidth / 2;
	                var curEl = angular.element(icons[index]);
	                var prvEl = angular.element(iconsDiv[0].querySelector(".active"));
	                if (curEl && curEl.length) {
	                    var curElWidth = curEl[0].offsetWidth, curElLeft = curEl[0].offsetLeft;

	                    if (prvEl.attr('icon-off')) {
	                        prvEl.attr("class", prvEl.attr('icon-off'));
	                    } else {
	                        prvEl.removeClass("active");
	                    }
	                    if (curEl.attr('icon-on')) {
	                        curEl.attr("class", curEl.attr('icon-on'));
	                    }
	                    curEl.addClass("active");

	                    var leftStr = (middle - (curElLeft) - curElWidth / 2 + 5);
	                    //If tabs are not scrollable
	                    if (!scrollDiv) {
	                        var leftStr = (middle - (curElLeft) - curElWidth / 2 + 5) + "px";
	                        wrap.style.webkitTransform = "translate3d(" + leftStr + ",0,0)";
	                    } else {
	                        //If scrollable tabs
	                        var wrapWidth = wrap.offsetWidth;
	                        var currentX = Math.abs(getX(scrollDiv.style.webkitTransform));
	                        var leftOffset = 100;
	                        var elementOffset = 40;
	                        //If tabs are reaching right end or left end
	                        if (((currentX + wrapWidth) < (curElLeft + curElWidth + elementOffset)) || (currentX > (curElLeft - leftOffset))) {
	                            if (leftStr > 0) {
	                                leftStr = 0;
	                            }
	                            //Use this scrollTo, so when scrolling tab manually will not flicker
	                            ionicScrollDelegate.scrollTo(Math.abs(leftStr), 0, true);
	                        }
	                    }
	                }
	            };
	            function getX(matrix) {
	                matrix = matrix.replace("translate3d(", "");
	                matrix = matrix.replace("translate(", "");
	                return (parseInt(matrix));
	            }
	            var events = scope.events;
	            events.on('slideChange', function (data) {
	                setPosition(data.index);
	            });
	            events.on('ngRepeatFinished', function (ngRepeatFinishedEvent) {
	                renderScrollableTabs();
	            });
	            renderScrollableTabs();

	        },
	        controller: function ($scope, $attrs, $element) {
	            $scope.events = new SimplePubSub();
	            $scope.slideHasChanged = function (index) {
	                $scope.events.trigger("slideChange", { "index": index });
	                $timeout(function () { if ($scope.onSlideMove) $scope.onSlideMove({ "index": eval(index) }); }, 100);
	            };
	            $scope.$on('ngRepeatFinished', function (ngRepeatFinishedEvent) {
	                $scope.events.trigger("ngRepeatFinished", { "event": ngRepeatFinishedEvent });
	            });
	        }
	    };

	}
]);