(function () {
"use strict"

angular.module('shared')
    .service('resourceHelper', [
        function resourceHelper() {
            var service = this;
            service.activityTypesByName = {
                READ      : 'read',
                LISTEN    : 'listen',
                QUIZ      : 'quiz',
                WORKSHEET : 'worksheet',
                WATCH     : 'watch',
                INTERACTIVE: 'interactive_lesson'
            };
            
            service.sitnLevelStageIdMap = {
                Early: 1,
                Middle: 2,
                Upper: 3
            };
            
            service.setResourceInfo = setResourceInfo;
            service.getTitle = getTitle;
            service.areActivitiesDisabled = areActivitiesDisabled;
            service.getResourceLevels = getResourceLevels;
            service.getScienceLevelsForFileCabinet = getScienceLevelsForFileCabinet;
            service.getSelectedActivities = getSelectedActivities;
            service.filterSelected = filterSelected;
            service.quizSelected = quizSelected;
            service.getSelectedResources = getSelectedResources;

            function setResourceInfo(resourceInfo) {
                service.resourceInfo = resourceInfo;
                service.activities = service.resourceInfo[0].activities;
                service.resources = angular.copy(_.reduce(resourceInfo, function(memo, value) {
                    memo.push(value['resources'][0]);
                    return memo;
                }, []));

                service.isISL = isActivityType('interactive_lesson');
                service.isInteractiveComponent = isActivityType('interactive_component');
                service.isSitN = service.resources[0].unitId === 0 && service.resources[0].displayOrder == null;
                service.isWorksheet = service.activities[0].activity_name === service.activityTypesByName.WORKSHEET;
            }

            function isActivityType(activityName) {
                return _.filter(service.activities, function(activity) {
                    return activity.activity_name === activityName;
                }).length !== 0;
            }

            function getTitle() {
                return service.isISL && service.resourceInfo[0].resources[0].unitTitle
                    ? (service.resourceInfo[0].resources[0].unitTitle + " Interactive Science Lesson")
                    : service.resourceInfo[0].resources[0].displayTitle;
            }

            function areActivitiesDisabled() {
                return service.activities.length <= 1;
            }

            function getResourceLevels() {
                if(service.isSitN) {
                    return _.reduce(service.resources, function(memo, resource) {
                        var sitnLevels = {
                            1: 'Early', 
                            2: 'Middle',
                            3: 'Upper'
                        };
                        
                        if(sitnLevels[resource.stageId]) {
                            memo.push(sitnLevels[resource.stageId]);
                        }
                        return memo;
                    }, []);
                }
                var possibleLevels = ['low', 'mid', 'high'];
                var foundLevels = _.reduce(service.resources, function(memo, value) {
                    var readingLevel = value.readingLevel;
                    if(memo.indexOf(readingLevel) === -1) {
                        memo.push(readingLevel);
                    }
                    return memo
                }, []);

                return _.intersection(possibleLevels, foundLevels);
            }

            function getScienceLevelsForFileCabinet(type) {
                if (type === 'isl') {
                    return ['low-mid', 'high'];
                }

                if (type === 'sitn') {
                    return ['early', 'middle', 'upper'];
                }

                return ['low', 'mid', 'high'];
            }

            function getSelectedActivities() {
                return filterSelected(service.activities);
            }

            function filterSelected(collection) {
                return collection.filter(function (item) {
                    return item.selected;
                })
            }

            function quizSelected() {
                return !!_.filter(getSelectedActivities(), function (item) {
                    return item.activity_name === service.activityTypesByName.QUIZ;
                }).length
            }

            function filterLevel(collection, chosenLevel) {
                return collection.filter(function (item) {
                    return item.readingLevel === chosenLevel || 
                        (service.isSitN && item.stageId == service.sitnLevelStageIdMap[chosenLevel]);
                })
            }

            function filterPart(collection, chosenPart) {
                return collection.filter(function(item) {
                    return item.interactiveLessonResourceDeploymentId ? chosenPart[item.displayOrder] : true;
                });
            }

            function getSelectedResources(chosenLevel, chosenPart) {
                if(service.resources.length === 1) {
                    return service.resources;
                }
                return filterPart(filterLevel(service.resources, chosenLevel), chosenPart);
            }
        }
    ]);
})();