'use strict';

const xml = require('xml');
const nconf = require('nconf');

const plugins = require('../plugins');
const meta = require('../meta');

module.exports.handle = function (req, res, next) {
	if (plugins.hooks.hasListeners('filter:search.query')) {
		res.type('application/opensearchdescription+xml').send(generateXML());
	} else {
		next();
	}
};

function generateXML() {
	return xml([{
		OpenSearchDescription: [
			{ _attr: {
				xmlns: 'http://a9.com/-/spec/opensearch/1.1/',
				'xmlns:moz': 'http://www.mozilla.org/2006/browser/search/',
			} },
			{ ShortName: trimToLength(String(meta.config.title || meta.config.browserTitle || 'NodeBB'), 16) },
			{ Description: trimToLength(String(meta.config.description || ''), 1024) },
			{ InputEncoding: 'UTF-8' },
			{ Image: [
				{ _attr: {
					width: '16',
					height: '16',
					type: 'image/x-icon',
				} },
				nconf.get('url') + '/favicon.ico',
			] },
			{ Url: {
				_attr: {
					type: 'text/html',
					method: 'get',
					template: nconf.get('url') + '/search?term={searchTerms}&in=titlesposts',
				},
			} },
			{ 'moz:SearchForm': nconf.get('url') + '/search' },
		],
	}], { declaration: true, indent: '\t' });
}

function trimToLength(string, length) {
	return string.trim().substring(0, length).trim();
}