/* ----------------------------------------------------------------------------
 * Easy!Appointments - Open Source Web Scheduler
 *
 * @package     EasyAppointments
 * @author      A.Tselegidis <alextselegidis@gmail.com>
 * @copyright   Copyright (c) 2013 - 2016, Alex Tselegidis
 * @license     http://opensource.org/licenses/GPL-3.0 - GPLv3
 * @link        http://easyappointments.org
 * @since       v1.0.0
 * ---------------------------------------------------------------------------- */

(function() {

    'use strict';

    /**
     * This class contains the Admins helper class declaration, along with the "Admins" tab
     * event handlers. By deviding the backend/users tab functionality into separate files
     * it is easier to maintain the code.
     *
     * @class AdminsHelper
     */
    var AdminsHelper = function() {
        this.filterResults = []; // Store the results for later use.
    };

    /**
     * Bind the event handlers for the backend/users "Admins" tab.
     */
    AdminsHelper.prototype.bindEventHandlers = function() {
        /**
         * Event: Filter Admins Form "Sumbit"
         *
         * Filter the admin records with the given key string.
         */
        $('#admins').on('submit', '#filter-admins form', function() {
            var key = $('#filter-admins .key').val();
            $('#filter-admins .selected-row').removeClass('selected-row');
            this.resetForm();
            this.filter(key);
            return false;
        }.bind(this));

        /**
         * Event: Clear Filter Results Button "Click"
         */
        $('#admins').on('click', '#filter-admins .clear', function() {
            this.filter('');
            $('#filter-admins .key').val('');
            this.resetForm();
        }.bind(this));

        /**
         * Event: Filter Admin Row "Click"
         *
         * Display the selected admin data to the user.
         */
        $('#admins').on('click', '.admin-row', function(e) {
            if ($('#filter-admins .filter').prop('disabled')) {
                $('#filter-admins .results').css('color', '#AAA');
                return; // exit because we are currently on edit mode
            }

            var adminId = $(e.currentTarget).attr('data-id');
            var admin = {};

            $.each(this.filterResults, function(index, item) {
                if (item.id === adminId) {
                    admin = item;
                    return false;
                }
            });

            this.display(admin);
            $('#filter-admins .selected-row').removeClass('selected-row');
            $(e.currentTarget).addClass('selected-row');
            $('#edit-admin, #delete-admin').prop('disabled', false);
        }.bind(this));

        /**
         * Event: Add New Admin Button "Click"
         */
        $('#admins').on('click', '#add-admin', function() {
            this.resetForm();
            $('#admins .add-edit-delete-group').hide();
            $('#admins .save-cancel-group').show();
            $('#admins .details').find('input, textarea').prop('readonly', false);
            $('#admin-password, #admin-password-confirm').addClass('required');
            $('#admin-notifications').prop('disabled', false);
            $('#filter-admins button').prop('disabled', true);
            $('#filter-admins .results').css('color', '#AAA');
        }.bind(this));

        /**
         * Event: Edit Admin Button "Click"
         */
        $('#admins').on('click', '#edit-admin', function() {
            $('#admins .add-edit-delete-group').hide();
            $('#admins .save-cancel-group').show();
            $('#admins .details').find('input, textarea').prop('readonly', false);
            $('#admin-password, #admin-password-confirm').removeClass('required');
            $('#admin-notifications').prop('disabled', false);

            $('#filter-admins .filter').prop('disabled', true);
            $('#filter-admins .results').css('color', '#AAA');
        });

        /**
         * Event: Delete Admin Button "Click"
         */
        $('#admins').on('click', '#delete-admin', function() {
            var adminId = $('#admin-id').val();
            var messageBtns = {};

            messageBtns[EALang['delete']] = function() {
                this.delete(adminId);
                $('#message_box').dialog('close');
            }.bind(this);

            messageBtns[EALang['cancel']] = function() {
                $('#message_box').dialog('close');
            };

            GeneralFunctions.displayMessageBox(EALang['delete_admin'],
                    EALang['delete_record_prompt'], messageBtns);
        }.bind(this));

        /**
         * Event: Save Admin Button "Click"
         */
        $('#admins').on('click', '#save-admin', function() {
            var admin = {
                first_name: $('#admin-first-name').val(),
                last_name: $('#admin-last-name').val(),
                email: $('#admin-email').val(),
                mobile_number: $('#admin-mobile-number').val(),
                phone_number: $('#admin-phone-number').val(),
                address: $('#admin-address').val(),
                city: $('#admin-city').val(),
                state: $('#admin-state').val(),
                zip_code: $('#admin-zip-code').val(),
                notes: $('#admin-notes').val(),
                settings: {
                    username: $('#admin-username').val(),
                    notifications: $('#admin-notifications').hasClass('active')
                }
            };

            // Include password if changed.
            if ($('#admin-password').val() !== '') {
                admin.settings.password = $('#admin-password').val();
            }

            // Include id if changed.
            if ($('#admin-id').val() !== '') {
                admin.id = $('#admin-id').val();
            }

            if (!this.validate(admin)) {
                return;
            }

            this.save(admin);
        }.bind(this));

        /**
         * Event: Cancel Admin Button "Click"
         *
         * Cancel add or edit of an admin record.
         */
        $('#admins').on('click', '#cancel-admin', function() {
            var id = $('#admin-id').val();
            this.resetForm();
            if (id != '') {
                this.select(id, true);
            }
        }.bind(this));
    };

    /**
     * Save admin record to database.
     *
     * @param {Object} admin Contains the admin record data. If an 'id' value is provided
     * then the update operation is going to be executed.
     */
    AdminsHelper.prototype.save = function(admin) {
        var postUrl = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_save_admin';
        var postData = {
            csrfToken: GlobalVariables.csrfToken,
            admin: JSON.stringify(admin)
        };

        $.post(postUrl, postData, function(response) {
            if (!GeneralFunctions.handleAjaxExceptions(response)) {
                return;
            }
            Backend.displayNotification(EALang['admin_saved']);
            this.resetForm();
            $('#filter-admins .key').val('');
            this.filter('', response.id, true);
        }.bind(this), 'json').fail(GeneralFunctions.ajaxFailureHandler);
    };

    /**
     * Delete an admin record from database.
     *
     * @param {Number} id Record id to be deleted.
     */
    AdminsHelper.prototype.delete = function(id) {
        var postUrl = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_delete_admin';
        var postData = {
            csrfToken: GlobalVariables.csrfToken,
            admin_id: id
        };

        $.post(postUrl, postData, function(response) {
            if (!GeneralFunctions.handleAjaxExceptions(response)) {
                return;
            }
            Backend.displayNotification(EALang['admin_deleted']);
            this.resetForm();
            this.filter($('#filter-admins .key').val());
        }.bind(this), 'json').fail(GeneralFunctions.ajaxFailureHandler);
    };

    /**
     * Validates an admin record.
     *
     * @param {Object} admin Contains the admin data to be validated.
     *
     * @return {Boolean} Returns the validation result.
     */
    AdminsHelper.prototype.validate = function(admin) {
        $('#admins .required').css('border', '');
        $('#admin-password, #admin-password-confirm').css('border', '');

        try {
            // Validate required fields.
            var missingRequired = false;

            $('#admins .required').each(function() {
                if ($(this).val() == '' || $(this).val() == undefined) {
                    $(this).css('border', '2px solid red');
                    missingRequired = true;
                }
            });

            if (missingRequired) {
                throw 'Fields with * are  required.';
            }

            // Validate passwords.
            if ($('#admin-password').val() != $('#admin-password-confirm').val()) {
                $('#admin-password, #admin-password-confirm').css('border', '2px solid red');
                throw EALang['passwords_mismatch'];
            }

            if ($('#admin-password').val().length < BackendUsers.MIN_PASSWORD_LENGTH
                    && $('#admin-password').val() != '') {
                $('#admin-password, #admin-password-confirm').css('border', '2px solid red');
                throw EALang['password_length_notice'].replace('$number', BackendUsers.MIN_PASSWORD_LENGTH);
            }

            // Validate user email.
            if (!GeneralFunctions.validateEmail($('#admin-email').val())) {
                $('#admin-email').css('border', '2px solid red');
                throw EALang['invalid_email'];
            }

            // Check if username exists
            if ($('#admin-username').attr('already-exists') ==  'true') {
                $('#admin-username').css('border', '2px solid red');
                throw EALang['username_already_exists'];
            }

            return true;
        } catch(exc) {
            $('#admins .form-message').text(exc);
            $('#admins .form-message').show();
            return false;
        }
    };

    /**
     * Resets the admin form back to its initial state.
     */
    AdminsHelper.prototype.resetForm = function() {
        $('#admins .add-edit-delete-group').show();
        $('#admins .save-cancel-group').hide();
        $('#admins .details').find('input, textarea').prop('readonly', true);
        $('#admins .form-message').hide();
        $('#admin-notifications').prop('disabled', true);
        $('#admins .required').css('border', '');
        $('#admin-password, #admin-password-confirm').css('border', '');
        $('#admins .details').find('input, textarea').val('');
        $('#admin-notifications').removeClass('active');
        $('#edit-admin, #delete-admin').prop('disabled', true);

        $('#filter-admins .selected-row').removeClass('selected-row');
        $('#filter-admins button').prop('disabled', false);
        $('#filter-admins .results').css('color', '');
    };

    /**
     * Display a admin record into the admin form.
     *
     * @param {Object} admin Contains the admin record data.
     */
    AdminsHelper.prototype.display = function(admin) {
        $('#admin-id').val(admin.id);
        $('#admin-first-name').val(admin.first_name);
        $('#admin-last-name').val(admin.last_name);
        $('#admin-email').val(admin.email);
        $('#admin-mobile-number').val(admin.mobile_number);
        $('#admin-phone-number').val(admin.phone_number);
        $('#admin-address').val(admin.address);
        $('#admin-city').val(admin.city);
        $('#admin-state').val(admin.state);
        $('#admin-zip-code').val(admin.zip_code);
        $('#admin-notes').val(admin.notes);

        $('#admin-username').val(admin.settings.username);
        if (admin.settings.notifications == true) {
            $('#admin-notifications').addClass('active');
        } else {
            $('#admin-notifications').removeClass('active');
        }
    };

    /**
     * Filters admin records depending a key string.
     *
     * @param {String} key This string is used to filter the admin records of the database.
     * @param {Number} selectId (OPTIONAL = undefined) This record id will be selected when
     * the filter operation is finished.
     * @param {Boolean} display (OPTIONAL = false) If true the selected record data are going
     * to be displayed on the details column (requires a selected record though).
     */
    AdminsHelper.prototype.filter = function(key, selectId, display) {
        display = display || false;

        var postUrl = GlobalVariables.baseUrl + '/index.php/backend_api/ajax_filter_admins';
        var postData = {
            csrfToken: GlobalVariables.csrfToken,
            key: key
        };

        $.post(postUrl, postData, function(response) {
            if (!GeneralFunctions.handleAjaxExceptions(response)) {
                return;
            }

            this.filterResults = response;

            $('#filter-admins .results').data('jsp').destroy();
            $('#filter-admins .results').html('');
            $.each(response, function(index, admin) {
                var html = this.getFilterHtml(admin);
                $('#filter-admins .results').append(html);
            }.bind(this));
            $('#filter-admins .results').jScrollPane({ mouseWheelSpeed: 70 });

            if (response.length == 0) {
                $('#filter-admins .results').html('<em>' + EALang['no_records_found'] + '</em>')
            }

            if (selectId != undefined) {
                this.select(selectId, display);
            }
        }.bind(this), 'json').fail(GeneralFunctions.ajaxFailureHandler);
    };

    /**
     * Get an admin row html code that is going to be displayed on the filter results list.
     *
     * @param {Object} admin Contains the admin record data.
     *
     * @return {String} The html code that represents the record on the filter results list.
     */
    AdminsHelper.prototype.getFilterHtml = function(admin) {
        var name = admin.first_name + ' ' + admin.last_name;
        var info = admin.email;

        info = (admin.mobile_number != '' && admin.mobile_number != null)
                ? info + ', ' + admin.mobile_number : info;

        info = (admin.phone_number != '' && admin.phone_number != null)
                ? info + ', ' + admin.phone_number : info;

        var html =
                '<div class="admin-row" data-id="' + admin.id + '">' +
                    '<strong>' + name + '</strong><br>' +
                    info + '<br>' +
                '</div><hr>';

        return html;
    };

    /**
     * Select a specific record from the current filter results. If the admin id does not exist
     * in the list then no record will be selected.
     *
     * @param {Number} id The record id to be selected from the filter results.
     * @param {Boolean} display Optional (false), if true then the method will display the record
     * on the form.
     */
    AdminsHelper.prototype.select = function(id, display) {
        display = display || false;

        $('#filter-admins .selected-row').removeClass('selected-row');

        $('.admin-row').each(function() {
            if ($(this).attr('data-id') == id) {
                $(this).addClass('selected-row');
                return false;
            }
        });

        if (display) {
            $.each(this.filterResults, function(index, admin) {
                if (admin.id == id) {
                    this.display(admin);
                    $('#edit-admin, #delete-admin').prop('disabled', false);
                    return false;
                }
            }.bind(this));
        }
    };

    window.AdminsHelper = AdminsHelper;

})();