<?php
/**
 * Name: Custom HTML Headers
 * Author: Drudex Software <support@drudexsoftware.com>
 * Link: http://www.drudexsoftware.com
 * License: GPLv2
 * Description: Allows admins to modify & set custom &lt;head&gt; content
 * Documentation:
 *  When you go to board config you can find a block named Custom HTML Headers.
 *  In that block you can simply place any thing you can place within &lt;head&gt;&lt;/head&gt;
 *  
 *  This can be useful if you want to add website tracking code or other javascript.
 *  NOTE: Only use if you know what you're doing. 
 *  
 *  You can also add your website name as prefix or suffix to the title of each page on your website.
 */
class custom_html_headers extends Extension {
        # Adds setup block for custom <head> content
        public function onSetupBuilding(SetupBuildingEvent $event) {
                global $config;
            
		$sb = new SetupBlock("Custom HTML Headers");
                
                // custom headers
		$sb->add_longtext_option("custom_html_headers", 
                        "HTML Code to place within &lt;head&gt;&lt;/head&gt; on all pages<br>");
                
                // modified title
                $sb->add_choice_option("sitename_in_title", array(
                    "none" => 0,
                    "as prefix" => 1,
                    "as suffix" => 2
                ), "<br>Add website name in title");
                
		$event->panel->add_block($sb);
	}
        
        public function onInitExt(InitExtEvent $event) {
            global $config;
            $config->set_default_int("sitename_in_title", 0);
        }
        
        # Load Analytics tracking code on page request
        public function onPageRequest(PageRequestEvent $event) {
            $this->handle_custom_html_headers();
            $this->handle_modified_page_title();
        }
        
        private function handle_custom_html_headers() {
            global $config, $page;
            
            $header = $config->get_string('custom_html_headers','');
            if ($header!='') $page->add_html_header($header);
        }
        
        private function handle_modified_page_title() {
            global $config, $page;
            
            // get config values
            $site_title = $config->get_string("title");
            $sitename_in_title = $config->get_int("sitename_in_title");
            
            // if feature is enabled & sitename isn't already in title 
            // (can occur on index & other pages)
            if ($sitename_in_title != 0 && !strstr($page->title, $site_title))
            {
                if ($sitename_in_title == 1) 
                    $page->title = "$site_title - $page->title"; // as prefix
                else if ($sitename_in_title == 2) 
                    $page->title = "$page->title - $site_title"; // as suffix
            }
        }
}