/*
 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.
 */


/**
 * HTML: DOM creator class
 * args:
 * - type: HTML element type (div, table, p etc) to produce
 * - params: hash of element params to add (class, style etc)
 * - children: optional child or children objects to insert into the new element
 * Example:
 * div = new HTML('div', {
 *    class: "footer",
 *    style: {
 *        fontWeight: "bold"
 *    }
#}, "Some text inside a div")
 */

const txt = (msg) => document.createTextNode(msg);

const HTML = (function() {
    function HTML(type, params, children) {

        /* create the raw element, or clone if passed an existing element */
        if (typeof type === 'object') {
            this.element = type.cloneNode();
        } else {
            this.element = document.createElement(type);
        }

        /* If params have been passed, set them */
        if (isHash(params)) {
            for (let key in params) {
                let val = params[key];

                /* Standard string value? */
                if (typeof val === "string" || typeof val === 'number') {
                    this.element.setAttribute(key, val);
                } else if (isArray(val)) {

                    /* Are we passing a list of data to set? concatenate then */
                    this.element.setAttribute(key, val.join(" "));
                } else if (isHash(val)) {

                    /* Are we trying to set multiple sub elements, like a style? */
                    for (let subkey in val) {
                        let subval = val[subkey];
                        if (!this.element[key]) {
                            throw "No such attribute, " + key + "!";
                        }
                        this.element[key][subkey] = subval;
                    }
                }
            }
        }

        /* If any children have been passed, add them to the element */
        if (children) {

            /* If string, convert to textNode using txt() */
            if (typeof children === "string") {
                this.element.inject(txt(children));
            } else {

                /* If children is an array of elems, iterate and add */
                if (isArray(children)) {
                    let child, j, len;
                    for (j = 0, len = children.length; j < len; j++) {
                        child = children[j];

                        /* String? Convert via txt() then */
                        if (typeof child === "string") {
                            this.element.inject(txt(child));
                        } else {

                            /* Plain element, add normally */
                            this.element.inject(child);
                        }
                    }
                } else {

                    /* Just a single element, add it */
                    this.element.inject(children);
                }
            }
        }
        return this.element;
    }

    return HTML;

})();

/**
 * prototype injector for HTML elements:
 * Example: mydiv.inject(otherdiv)
 */

HTMLElement.prototype.inject = function(child) {
    let item, j, len;
    if (isArray(child)) {
        for (j = 0, len = child.length; j < len; j++) {
            item = child[j];
            if (typeof item === 'string') {
                item = txt(item);
            }
            this.appendChild(item);
        }
    } else {
        if (typeof child === 'string') {
            child = txt(child);
        }
        this.appendChild(child);
    }
    return child;
};


/**
 * prototype for emptying an html element
 */

HTMLElement.prototype.empty = function() {
    let ndiv;
    ndiv = this.cloneNode();
    this.parentNode.replaceChild(ndiv, this);
    return ndiv;
};

function toggleView(id) {
    let obj = document.getElementById(id);
    if (obj) {
        obj.style.display = (obj.style.display == 'block') ? 'none' : 'block';
    }
}