/**
 * EGroupware eTemplate2 - JS Template base class
 *
 * @license http://opensource.org/licenses/gpl-license.php GPL - GNU General Public License
 * @package etemplate
 * @subpackage api
 * @link https://www.egroupware.org
 * @author Andreas Stöckel
 */
/*egw:uses
    et2_core_xml;
    et2_core_DOMWidget;
*/
import './et2_core_interfaces';
import { et2_DOMWidget } from './et2_core_DOMWidget';
import { ClassWithAttributes } from "./et2_core_inheritance";
import { et2_register_widget } from "./et2_core_widget";
import { etemplate2 } from "./etemplate2";
import { et2_cloneObject, et2_no_init } from "./et2_core_common";
import { et2_loadXMLFromURL } from "./et2_core_xml";
import { egw } from "../jsapi/egw_global";
/**
 * Class which implements the "template" XET-Tag. When the id parameter is set,
 * the template class checks whether another template with this id already
 * exists. If yes, this template is removed from the DOM tree, copied and
 * inserted in place of this template.
 */
export class et2_template extends et2_DOMWidget {
    /**
     * Constructor
     */
    constructor(_parent, _attrs, _child) {
        // Call the inherited constructor
        super(_parent, _attrs, ClassWithAttributes.extendAttributes(et2_template._attributes, _child || {}));
        // Set this early, so it's available for creating namespace
        if (_attrs.content) {
            this.content = _attrs.content;
        }
        // constructor was called here before!
        this.div = document.createElement("div");
        // Deferred object so we can load via AJAX
        this.loading = jQuery.Deferred();
        // run transformAttributes now, to get server-side modifications (url!)
        if (_attrs.template) {
            this.id = _attrs.template;
            this.transformAttributes(_attrs);
            this.options = et2_cloneObject(_attrs);
            _attrs = {};
        }
        if (this.id != "" || this.options.template) {
            var parts = (this.options.template || this.id).split('?');
            var cache_buster = parts.length > 1 ? parts.pop() : null;
            var template_name = parts.pop();
            // Check to see if XML is known
            var xml = null;
            var templates = etemplate2.templates; // use global eTemplate cache
            if (!(xml = templates[template_name])) {
                // Check to see if ID is short form --> prepend parent/top-level name
                if (template_name.indexOf('.') < 0) {
                    var root = _parent ? _parent.getRoot() : null;
                    var top_name = root && root._inst ? root._inst.name : null;
                    if (top_name && template_name.indexOf('.') < 0)
                        template_name = top_name + '.' + template_name;
                }
                xml = templates[template_name];
                if (!xml) {
                    // Ask server
                    var url = this.options.url;
                    if (!this.options.url) {
                        var splitted = template_name.split('.');
                        var app = splitted.shift();
                        // use template base url from initial template, to continue using webdav, if that was loaded via webdav
                        url = this.getRoot()._inst.template_base_url + app + "/templates/default/" +
                            splitted.join('.') + ".xet" + (cache_buster ? '?download=' + cache_buster : '');
                    }
                    // if server did not give a cache-buster, fall back to current time
                    if (url.indexOf('?') == -1)
                        url += '?download=' + (new Date).valueOf();
                    if (this.options.url || splitted.length) {
                        var fetch_url_callback = function (_xmldoc) {
                            // Scan for templates and store them
                            for (var i = 0; i < _xmldoc.childNodes.length; i++) {
                                var template = _xmldoc.childNodes[i];
                                if (template.nodeName.toLowerCase() != "template")
                                    continue;
                                templates[template.getAttribute("id")] = template;
                            }
                            // Read the XML structure of the requested template
                            if (typeof templates[template_name] != 'undefined')
                                this.loadFromXML(templates[template_name]);
                            // Update flag
                            this.loading.resolve();
                        };
                        et2_loadXMLFromURL(url, fetch_url_callback, this, function (error) {
                            url = egw.link('/' + app + "/templates/default/" +
                                splitted.join('.') + ".xet", { download: cache_buster ? cache_buster : (new Date).valueOf() });
                            et2_loadXMLFromURL(url, fetch_url_callback, this);
                        });
                    }
                    return;
                }
            }
            if (xml !== null && typeof xml !== "undefined") {
                this.egw().debug("log", "Loading template from XML: ", template_name);
                this.loadFromXML(xml);
                // Don't call this here - done by caller, or on whole widget tree
                //this.loadingFinished();
                // But resolve the promise
                this.loading.resolve();
            }
            else {
                this.egw().debug("warn", "Unable to find XML for ", template_name);
                this.loading.reject();
            }
        }
        else {
            // No actual template
            this.loading.resolve();
        }
    }
    /**
     * Override parent to support content attribute
     * Templates always have ID set, but seldom do we want them to
     * create a namespace based on their ID.
     */
    checkCreateNamespace(_attrs) {
        if (_attrs.content) {
            var old_id = _attrs.id;
            this.id = _attrs.content;
            super.checkCreateNamespace.apply(this, arguments);
            this.id = old_id;
        }
    }
    _createNamespace() {
        return true;
    }
    getDOMNode() {
        return this.div;
    }
    attachToDOM() {
        if (this.div) {
            jQuery(this.div)
                .off('.et2_template')
                .bind("load.et2_template", this, function (e) {
                e.data.load.call(e.data, this);
            });
        }
        return super.attachToDOM();
    }
    /**
     * Called after the template is fully loaded to handle any onload handlers
     */
    load() {
        if (typeof this.options.onload == 'function') {
            // Make sure function gets a reference to the widget
            var args = Array.prototype.slice.call(arguments);
            if (args.indexOf(this) == -1)
                args.push(this);
            return this.options.onload.apply(this, args);
        }
    }
    /**
     * Override to return the promise for deferred loading
     */
    doLoadingFinished() {
        // Apply parent now, which actually puts into the DOM
        super.doLoadingFinished();
        // Fire load event when done loading
        this.loading.done(jQuery.proxy(function () { jQuery(this).trigger("load"); }, this.div));
        // Not done yet, but widget will let you know
        return this.loading.promise();
    }
}
et2_template._attributes = {
    "template": {
        "name": "Template",
        "type": "string",
        "description": "Name / ID of template with optional cache-buster ('?'+filemtime of template on server)",
        "default": et2_no_init
    },
    "group": {
        // TODO: Not implemented
        "name": "Group",
        "description": "Not implemented",
        //"default": 0
        "default": et2_no_init
    },
    "version": {
        "name": "Version",
        "type": "string",
        "description": "Version of the template"
    },
    "lang": {
        "name": "Language",
        "type": "string",
        "description": "Language the template is written in"
    },
    "content": {
        "name": "Content index",
        "default": et2_no_init,
        "description": "Used for passing in specific content to the template other than what it would get by ID."
    },
    url: {
        name: "URL of template",
        type: "string",
        description: "full URL to load template incl. cache-buster"
    },
    "onload": {
        "name": "onload",
        "type": "js",
        "default": et2_no_init,
        "description": "JS code which is executed after the template is loaded."
    }
};
et2_register_widget(et2_template, ["template"]);
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