(function(){
    'use strict';

    angular.module('shared')
        .factory('menuItemPopoverAmbassador', ['$rootScope', dataService]);

    function dataService($rootScope){

        var UPDATE_MENU_ITEM_EVENT = 'updateMenuItemEvent';
        var ACTIVATED_MENU_ITEM_EVENT = 'activatedMenuItemEvent';

        var activeMenuItemPopoverCtrl;
        var initFirstSubMenuOpen = false;

        return {
            setInitFirstSubMenuOpen: setInitFirstSubMenuOpen,
            getInitFirstSubMenuOpen: getInitFirstSubMenuOpen,
            registerOnUpdateMenuItem: registerOnUpdateMenuItem,
            emitUpdateMenuItem: emitUpdateMenuItem,
            registerOnActivatedMenuItem: registerOnActivatedMenuItem,
            emitActivatedMenuItem: emitActivatedMenuItem,
            setActivePopoverCtrl: setActivePopoverCtrl,
            getActivePopoverCtrl: getActivePopoverCtrl,
            resetActivePopoverCtrl: resetActivePopoverCtrl,
            isInTriangle: isInTriangle,
            getTriangleCoordinates: getTriangleCoordinates
        };

        function setInitFirstSubMenuOpen(initOpen){
            initFirstSubMenuOpen = initOpen;
        }

        function getInitFirstSubMenuOpen() {
            return initFirstSubMenuOpen;
        }

        function registerOnUpdateMenuItem(scope, callback) {
            var eventListenerDestructor = $rootScope.$on(UPDATE_MENU_ITEM_EVENT, callback);
            scope.$on('$destroy', eventListenerDestructor);
        }

        function emitUpdateMenuItem(eventTarget){
            $rootScope.$emit(UPDATE_MENU_ITEM_EVENT, eventTarget);
        }

        function registerOnActivatedMenuItem(scope, callback) {
            var eventListenerDestructor = $rootScope.$on(ACTIVATED_MENU_ITEM_EVENT, callback);
            scope.$on('$destroy', eventListenerDestructor);
        }

        function emitActivatedMenuItem(eventTarget){
            $rootScope.$emit(ACTIVATED_MENU_ITEM_EVENT, eventTarget);
        }

        function setActivePopoverCtrl(popoverCtrl) {
            activeMenuItemPopoverCtrl = popoverCtrl;
        }

        function getActivePopoverCtrl() {
            return activeMenuItemPopoverCtrl;
        }

        function resetActivePopoverCtrl() {
            activeMenuItemPopoverCtrl = null;
        }

        function isInTriangle(px,py,triangleCoordinateObj) {
            var ax = triangleCoordinateObj.aX;
            var ay = triangleCoordinateObj.aY;
            var bx = triangleCoordinateObj.bX;
            var by = triangleCoordinateObj.bY;
            var cx = triangleCoordinateObj.cX;
            var cy = triangleCoordinateObj.cY;

            //credit: http://www.blackpawn.com/texts/pointinpoly/default.html

            var v0 = [cx-ax,cy-ay];
            var v1 = [bx-ax,by-ay];
            var v2 = [px-ax,py-ay];

            var dot00 = (v0[0]*v0[0]) + (v0[1]*v0[1]);
            var dot01 = (v0[0]*v1[0]) + (v0[1]*v1[1]);
            var dot02 = (v0[0]*v2[0]) + (v0[1]*v2[1]);
            var dot11 = (v1[0]*v1[0]) + (v1[1]*v1[1]);
            var dot12 = (v1[0]*v2[0]) + (v1[1]*v2[1]);

            var invDenom = 1/ (dot00 * dot11 - dot01 * dot01);

            var u = (dot11 * dot02 - dot01 * dot12) * invDenom;
            var v = (dot00 * dot12 - dot01 * dot02) * invDenom;

            return ((u >= 0) && (v >= 0) && (u + v < 1));
        }

        function getTriangleCoordinates(event) {
            var coordinateObject = {};
            var buffer = 25;
            var menuContainer = angular.element('.js-dropdownContainer');
            var menuCumulativeOffset = menuContainer.offset();
            coordinateObject.aX = event.pageX;                                                      // x-position of mouse when leaving target
            coordinateObject.aY = event.pageY;                                                      // y-position of mouse when leaving target
            coordinateObject.bX = menuCumulativeOffset.left + menuContainer.width();                // x-position of the top of the fly-out
            coordinateObject.bY = menuCumulativeOffset.top - buffer;                                // y-position of the top of the fly-out
            coordinateObject.cX = coordinateObject.bX;                                              // x-position of the bottom of the fly-out
            coordinateObject.cY = menuCumulativeOffset.top + menuContainer.height() + buffer;       // y-position of the bottom of the fly-out
            return coordinateObject;
        }
    }
}());