(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.VOCABULARY_SUBJECT_ID = 7;

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

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

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

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

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

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

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

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

        return service;
    }])
})();