/**
 * @preserve This file is part of Mibew Messenger project.
 * http://mibew.org
 *
 * Copyright (c) 2005-2011 Mibew Messenger Community
 * License: http://mibew.org/license.php
 */

/**
 * Register 'apply' Handlebars helper.
 *
 * This helper provide an ability to apply several helpers to single Handlebars
 * expression
 */
Handlebars.registerHelper('apply', function(text, helpers) {
    var result = text;
    var validHelperName = /^[0-9A-z_]+$/;
    helpers = helpers.split(/\s*,\s*/);
    for (var prop in helpers) {
        if (! helpers.hasOwnProperty(prop) ||
            ! validHelperName.test(helpers[prop])) {
            continue;
        }
        if (typeof Handlebars.helpers[helpers[prop]] != 'function') {
            throw new Error(
                "Unregistered helper '" + helpers[prop] + "'!"
            );
        }
        result = Handlebars.helpers[helpers[prop]](result);
    }
    return new Handlebars.SafeString(result);
});

/**
 * Register 'formatTime' Handlebars helper.
 *
 * This helper takes unix timestamp as argument and return time in "HH:MM:SS"
 * format
 */
Handlebars.registerHelper('formatTime', function(unixTimestamp){
    var d = new Date(unixTimestamp * 1000);
    // Get time parts
    var hours = d.getHours().toString();
    var minutes = d.getMinutes().toString();
    var seconds = d.getSeconds().toString();
    // Add leading zero if needed
    hours = hours > 10 ? hours : '0' + hours;
    minutes = minutes > 10 ? minutes : '0' + minutes;
    seconds = seconds > 10 ? seconds : '0' + seconds;
    // Build result string
    return hours + ':' + minutes + ':' + seconds;
});

/**
 * Register 'urlReplace' Handlebars helper.
 *
 * This helper serch URLs and replace them by 'a' tag
 */
Handlebars.registerHelper('urlReplace', function(text) {
    return new Handlebars.SafeString(
        text.replace(
            /((?:https?|ftp):\/\/\S*)/g,
            '<a href="$1" target="_blank">$1</a>'
        )
    );
});

/**
 * Register 'nl2br' Handlebars helper.
 *
 * This helper replace all new line characters (\n) by 'br' tags
 */
Handlebars.registerHelper('nl2br', function(text) {
    return new Handlebars.SafeString(text.replace(/\n/g, "<br/>"));
});