(function () {
"use strict";

angular.module('shared')
    .service('subjects', ['memberInfo', '_', function subjectsService(memberInfo, _) {
        var service = this;

        service.READING_SUBJECT_ID = 1;
        service.SCIENCE_SUBJECT_ID = 2;

        service.READING_SUBJECT_NAME = 'reading';
        service.SCIENCE_SUBJECT_NAME = 'science';

        service.getSubjects = function () {
            return memberInfo.subjects;
        };

        service.getSubscribedSubjectsByName = _.memoize(function () {
            return _.indexBy(service.getSubscribedSubjects(), 'subject_name');
        });

        service.getSubscribedSubjectByName = function (name) {
            return service.getSubscribedSubjectsByName()[name];
        };

        service.isSubscribedSubjectName = function (name) {
            return service.getSubscribedSubjectsByName().hasOwnProperty(name);
        };

        service.getSubscribedSubjects = _.memoize(function () {
            return _.filter(memberInfo.subjects, function (subject) {
                return subject.is_subscribed;
            });
        });

        service.haveMultipleSubscribedSubjects = function () {
            return service.getSubscribedSubjects().length > 1;
        };

        service.isValidSubject = function (subject) {
            return _.contains(service.getSubjects(), subject)
        };

        return service;
    }])
})();