(function() {
    "use strict";

    angular
        .module('shared')
        .factory('ParentLetterCustomize', ['LazModalService', 'studentList', 'DocsForHomeConstants', '_', '$window', 'AuthGo',
            function (LazModalService, studentList, DocsForHomeConstants, _, $window, AuthGo) {

                function ParentLetterCustomize() {
                    var self = this;

                    function ParentLetterCustomizeCtrl(close) {
                        var ctrl = this;

                        studentList.get().$promise.then(function (students) {
                            ctrl.students = angular.copy(students);
                        });

                        ctrl.LANGUAGES = DocsForHomeConstants.PARENT_LETTER_LANGUAGES;

                        ctrl.NONE_LANGUAGE_KEY = 'none';
                        ctrl.ENGLISH_LANGUAGE_KEY = 'en';

                        ctrl.selectedLanguageKey = ctrl.ENGLISH_LANGUAGE_KEY;

                        ctrl.FORMATS = {
                            'pdf': {'displayName': 'Single PDF', 'description': 'Parent letters can be downloaded as a single pdf file, ideal for printing.'},
                            'zip': {'displayName': 'Zipped Folder', 'description': 'Parent letters can be downloaded as a zip file of individual PDF files per student, for attaching to email.'}
                        };
                        ctrl.selectedFormatKey = 'pdf';

                        ctrl.allSelectedToggleState = false;
                        ctrl.downloadButtonDisabled = true;

                        ctrl.studentCheckboxes = {};
                        ctrl.languagesByStudent = {};

                        function init() {
                            defineCustomized();
                        }

                        init();

                        ctrl.toggleAllSelected = function() {
                            _.each(ctrl.students, function(student) {
                                var studentId = student.student_id;

                                ctrl.studentCheckboxes[studentId] = ctrl.allSelectedToggleState;

                                ctrl.languagesByStudent[studentId] = retrieveLanguageKeyForStudent(studentId);

                                ctrl.downloadButtonDisabled = !ctrl.allSelectedToggleState;

                                student.selected = ctrl.allSelectedToggleState;
                            });

                        };

                        ctrl.toggleStudentCheckbox = function(student) {
                            var studentId = student.student_id;

                            ctrl.languagesByStudent[studentId] = retrieveLanguageKeyForStudent(studentId);

                            ctrl.downloadButtonDisabled = areAllChoicesNone();

                            student.selected = ctrl.studentCheckboxes[studentId];

                        };

                        ctrl.onLanguageSelected = function(selectedLanguageKey) {
                            ctrl.selectedLanguageKey = selectedLanguageKey ? selectedLanguageKey : null;

                            _.each(ctrl.students, function(student) {
                                var studentId = student.student_id;

                                ctrl.languagesByStudent[studentId] = retrieveLanguageKeyForStudent(studentId);
                            });

                        };

                        ctrl.isDownloadButtonDisabled = function() {
                            return ctrl.downloadButtonDisabled;
                        };

                        ctrl.downloadLetters = function() {
                            if (ctrl.selectedFormatKey === 'zip') {
                                sendDownloadPostRequest("/main/ParentLetter/lang/custom/action/downloadaszip");
                            }
                            else {
                                sendDownloadPostRequest("/main/ParentLetter/lang/custom/action/download");
                            }
                        };

                        ctrl.cancel = function() {
                            close();
                        };

                        function sendDownloadPostRequest(url) {
                            var form = document.createElement("form");
                            form.setAttribute("method", "post");
                            form.setAttribute("action", url);
                            form.setAttribute("target", url);

                            for (var studentId in ctrl.languagesByStudent) {
                                var language = ctrl.languagesByStudent[studentId];
                                var input = document.createElement("input");
                                input.setAttribute("name", "languagesByStudent[" + studentId + "]");
                                input.setAttribute("value", language);
                                form.appendChild(input);
                            }

                            document.body.appendChild(form);
                            form.submit();
                            form.remove();
                        }

                        function retrieveLanguageKeyForStudent(studentId) {
                            return ctrl.studentCheckboxes[studentId] ? ctrl.selectedLanguageKey : ctrl.NONE_LANGUAGE_KEY;
                        }

                        function defineCustomized() {
                            _.each(ctrl.students, function(student) {
                                ctrl.languagesByStudent[student.student_id] = ctrl.NONE_LANGUAGE_KEY;
                            });

                        }

                        function areAllChoicesNone() {
                            return _.every(ctrl.languagesByStudent, function(languageKey){
                                return languageKey === ctrl.NONE_LANGUAGE_KEY
                            });
                        }
                    }

                    self.show = function() {
                        LazModalService.showModal({
                            controller: ['close', ParentLetterCustomizeCtrl],
                            controllerAs: '$ctrl',
                            overrideClass: 'modalWindow',
                            onClose: '$ctrl.cancel',
                            templateUrl: '/shared/js/angular/ui/parent-letter-customize.html'
                        });
                    }
                }

                return new ParentLetterCustomize();
            }
        ]);
}());