(function () {
    "use strict";
    angular.module('shared')
        .service('TeachersUtil',
            ['NameUtil', 'memberInfo', 'loggedInInfo', '_', function (NameUtil, memberInfo, loggedInInfo, _) {
                function formatTeacherName(firstName, lastName) {
                    return NameUtil.formatName(firstName, lastName, true);
                }

                function sortableTeacherName(firstName, lastName, userName) {
                    return NameUtil.formatUserName(firstName, lastName, userName, true);
                }

                function membersFromStudents(students) {
                    return orderMembers(reduceStudentsToMembers(students));
                }

                function reduceStudentsToMembers(students) {
                    return _.reduce(students, function reduceStudentToMembers(memo, student) {
                        if (!isStudentsTeacherInCollection(memo, student)) {
                            memo.push(teacherFromStudent(student));
                        }
                        return memo;
                    }, []);
                }

                function orderMembers(members) {
                    return _.chain(members)
                        .sortBy('display_name')
                        .sortBy('order')
                        .value();
                }

                function isStudentsTeacherInCollection(collection, student) {
                    return _.find(collection, function isStudentsHomeroomTeacher(teacher) {
                        return teacher.member_id == student.homeroom_member_id;
                    });
                }

                function teacherFromStudent(student) {
                    var teacher = {
                        member_id: student.homeroom_member_id,
                        username: student.homeroom_member_username,
                        first_name: student.homeroom_member_first_name,
                        last_name: student.homeroom_member_last_name,
                        organization_name : student.organization_name,
                        is_shareable: student.is_shareable,
                    };
                    teacher.display_name =
                        teacher.member_id == memberInfo.member_id
                        && loggedInInfo.member_id == memberInfo.member_id ?
                            'My Homeroom' :
                            formatTeacherName(teacher.first_name, teacher.last_name);
                    teacher.order = teacher.member_id == memberInfo.member_id ? 1 : 2;
                    return teacher;
                }

                function formatStudentHomeroomMemberLastFirst(student) {
                    return NameUtil.formatName(student.homeroom_member_first_name, student.homeroom_member_last_name,
                        true);
                }

                function sortableHomeroomMemberName(student) {
                    return sortableTeacherName(student.homeroom_member_first_name, student.homeroom_member_last_name,
                        student.homeroom_member_username);
                }

                return {
                    formatTeacherName: formatTeacherName,
                    sortableTeacherName: sortableTeacherName,
                    membersFromStudents: membersFromStudents,
                    formatStudentHomeroomMemberLastFirst: formatStudentHomeroomMemberLastFirst,
                    sortableHomeroomMemberName: sortableHomeroomMemberName,
                };
            }])
})();