(function () {
    "use strict";

    angular.module('shared')
        .component('classroomsList', {
            templateUrl: '/shared/js/angular/classroom-list/classrooms-list.html',
            controller: 'ClassroomsList'
        })
        .controller('ClassroomsList', ['studentList', 'ChunkStudents', '$scope', '$parse', 'classroomInfo', 'StudentsUtil',
                'memberInfo',
            function ClassroomsList(studentList, ChunkStudents, $scope, $parse, classroomInfo, StudentsUtil, memberInfo) {
                var ctrl = this;

                var SELECTED_CLASSROOM_SESSION_KEY = 'ClassroomList::selectedClassroom';
                var SELECTED_SHARED_SESSION_KEY = 'ClassroomList::selectedShared';
                var getStudents = $parse('$ctrl.students.get() | sortByStudentName: $ctrl.memberInfo.sort_by_last_name');

                ctrl.sharedClassroom = {
                    classroom_alias: 'Shared Students'
                };
                ctrl.classrooms = classroomInfo.activeClassrooms;
                ctrl.students = studentList;
                ctrl.memberInfo = memberInfo;
                ctrl.hasSharedStudents = memberInfo.hasSharedStudents;

                ctrl.$postLink = function() {
                    $scope.$watchCollection(getStudents, updateChunkedStudents);
                };

                ctrl.getButtonClass = function(isFirstItem, isLastItem) {
                    if (isFirstItem) {
                        return 'js-first-item';
                    }
                    if (isLastItem && !ctrl.hasSharedStudents) {
                        return 'js-last-item';
                    }
                    return '';
                };

                ctrl.filterByClassroom = function(classroom) {
                    localStorage.setItem(SELECTED_CLASSROOM_SESSION_KEY, ctrl.selectedClassroomId = classroom.classroom_id);
                    localStorage.setItem(SELECTED_SHARED_SESSION_KEY, ctrl.selectedShared = false);
                    updateChunkedStudents(getStudents($scope));
                };

                ctrl.filterByShared = function() {
                    localStorage.setItem(SELECTED_CLASSROOM_SESSION_KEY, ctrl.selectedClassroomId = 0);
                    localStorage.setItem(SELECTED_SHARED_SESSION_KEY, ctrl.selectedShared = true);
                    updateChunkedStudents(getStudents($scope));
                };

                function updateChunkedStudents (students) {
                    ctrl.chunkedStudents = ChunkStudents.chunk(
                        students.filter(
                            function (student) {
                                if (ctrl.selectedClassroomId !== 0) {
                                    return student.classroom_id == ctrl.selectedClassroomId;
                                } else if (ctrl.selectedShared) {
                                    return student.is_shared;
                                }
                                return true;
                            }
                        )
                    );
                    ctrl.numCols = ctrl.chunkedStudents.length;
                    if (!studentList.pending) {
                        ctrl.hasSharedStudents = StudentsUtil.getShared(studentList.get()).length > 0;
                    }
                }
            }
        ])
})();