/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

import {default as ListEditable} from '../../controller';
import noItemsTemplate from './no-items-template.pug';
import hasItemsTemplate from './has-items-template.pug';
import './style.scss';

/**
 * Adds "add new item" button to list-editable-no-items slot and after list-editable
 * @type {ng.IComponentController}
 */
export class ListEditableAddItemButton {
    /** 
     * Template for button that's inserted after list-editable
     * @type {string}
     */
    static hasItemsTemplate = hasItemsTemplate;
    /** @type {ListEditable} */
    _listEditable;
    /** @type {string} */
    labelSingle;
    /** @type {string} */
    labelMultiple;
    /** @type {ng.ICompiledExpression} */
    _addItem;

    static $inject = ['$compile', '$scope'];

    /**
     * @param {ng.ICompileService} $compile
     * @param {ng.IScope} $scope
     */
    constructor($compile, $scope) {
        this.$compile = $compile;
        this.$scope = $scope;
    }

    $onDestroy() {
        this._listEditable = this._hasItemsButton = null;
    }

    $postLink() {
        this.$compile(ListEditableAddItemButton.hasItemsTemplate)(this.$scope, (hasItemsButton) => {
            hasItemsButton.insertAfter(this._listEditable.$element);
        });
    }

    get hasItems() {
        return !this._listEditable.ngModel.$isEmpty(this._listEditable.ngModel.$viewValue);
    }

    addItem() {
        return this._addItem({
            $edit: this._listEditable.ngModel.editListItem.bind(this._listEditable),
            $editLast: (length) => this._listEditable.ngModel.editListIndex(length - 1)
        });
    }
}

export default {
    controller: ListEditableAddItemButton,
    require: {
        _listEditable: '^listEditable'
    },
    bindings: {
        _addItem: '&addItem',
        labelSingle: '@',
        labelMultiple: '@'
    },
    template: noItemsTemplate
};