/*
 * Copyright (c) 2018, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
const ko = require('knockout');
const global = require('./global.js');

function keyupBindingFactory(keyCode) {
    return {
        init: function (element, valueAccessor, allBindingsAccessor, data, bindingContext) {
            var wrappedHandler, newValueAccessor;

            // wrap the handler with a check for the enter key
            wrappedHandler = function (data, event) {
                if (event.keyCode === keyCode) {
                    valueAccessor().call(this, data, event);
                }
            };

            // create a valueAccessor with the options that we would want to pass to the event binding
            newValueAccessor = function () {
                return {
                    keyup: wrappedHandler
                };
            };

            // call the real event binding's init function
            ko.bindingHandlers.event.init(element, newValueAccessor, allBindingsAccessor, data, bindingContext);
        }
    };
}
ko.bindingHandlers.enterKey = keyupBindingFactory(global.ENTER_KEY);
ko.bindingHandlers.escapeKey = keyupBindingFactory(global.ESCAPE_KEY);

// wrapper to hasfocus that also selects text and applies focus async
ko.bindingHandlers.selectAndFocus = {
    init: function (element, valueAccessor, allBindingsAccessor) {
        ko.bindingHandlers.hasfocus.init(element, valueAccessor, allBindingsAccessor);
        ko.utils.registerEventHandler(element, 'focus', function () {
            element.focus();
        });
    },
    update: function (element, valueAccessor) {
        ko.utils.unwrapObservable(valueAccessor()); // for dependency
        // ensure that element is visible before trying to focus
        setTimeout(function () {
            ko.bindingHandlers.hasfocus.update(element, valueAccessor);
        }, 0);
    }
};
