(function () {
    "use strict";

    angular
        .module('shared')
        .component('interactiveLessonPartSelector', {
            transclude: true,
            templateUrl: '/js/angular/unit-assignment/interactive-lesson-part-selector.html',
            controller: 'interactiveLessonPartSelector',
            bindings: {
                lessonParts: "<",
                selectedMaterials: "=",
                currentLevel: "="
            }
        })
        .controller('interactiveLessonPartSelector', interactiveLessonPartSelector);

    interactiveLessonPartSelector.$inject = ['$scope'];
    function interactiveLessonPartSelector($scope) {
        var ctrl = this;

        ctrl.$onInit = function() {
            _.each(ctrl.lessonParts, function (interactiveLessonPart) {
                ctrl.selectedMaterials[interactiveLessonPart.material.id] = true;
            });
            ctrl.currentLevel = hasLowMidLevelParts() ? 'lowmid' : 'high';
            onISLLevelSwitch(ctrl.currentLevel);
        };

        ctrl.hasLowMidLevelParts = hasLowMidLevelParts;
        ctrl.hasHighLevelParts = hasHighLevelParts;
        ctrl.onISLLevelSwitch = onISLLevelSwitch;

        function hasLowMidLevelParts() {
            return !!_.find(ctrl.lessonParts, function(parts) {
                return parts.material.readingLevel === 'mid';
            });
        }

        function hasHighLevelParts() {
            return !!_.find(ctrl.lessonParts, function(parts) {
                return parts.material.readingLevel === 'high';
            });
        }

        $scope.$watch(function() {
            return ctrl.currentLevel;
        }, function(newValue, oldValue) {
            if(oldValue != newValue) ctrl.onISLLevelSwitch(newValue);
        });

        function onISLLevelSwitch(currentLevel) {
            var levelPartMaterialIds = getLessonPartMaterialIdsForLessonByLevel(currentLevel);
            _.each(ctrl.selectedMaterials, function(material, id) {
                ctrl.selectedMaterials[id] = levelPartMaterialIds.indexOf(parseInt(id)) > -1;
            });
        }

        function getLessonPartMaterialIdsForLessonByLevel(level) {
            var trueLevel = level === "high" ? "high" : "mid";
            var partsOfLevel = [];
            _.each(ctrl.lessonParts, function(part) {
                if(part.material.readingLevel === trueLevel) partsOfLevel.push(part.material.id);
            });
            return partsOfLevel;
        }
    }
})();