<?php
/**************************************************************
 *                                                            *
 *   Provides a notification to the user everytime            *
 *   your WordPress theme is updated                          *
 *                                                            *
 *   Author: Joao Araujo                                      *
 *   Profile: http://themeforest.net/user/unisphere           *
 *   Follow me: http://twitter.com/unispheredesign            *
 *                                                            *
 **************************************************************/

if( tie_get_option('notify_theme') && is_admin() ):

define( 'MTHEME_NOTIFIER_CACHE_INTERVAL', 43200 );

// Adds an update notification to the WordPress Dashboard menu
function tie_update_notifier_menu() {  
	if ( function_exists('simplexml_load_string') && function_exists('wp_get_theme') ) { // Stop if simplexml_load_string funtion isn't available
	    $xml = tie_get_latest_theme_version(MTHEME_NOTIFIER_CACHE_INTERVAL); // Get the latest remote XML file on our server
            $theme_data = wp_get_theme(); // Read theme current version from the style.css

         if( version_compare($xml->latest, $theme_data['Version'], '>') ) { // Compare current theme version with the remote XML version
			add_submenu_page('panel', THEME_NAME . __( 'Theme Updates', 'tie' ), __( 'Theme Updates', 'tie' ) . ' <span class="update-plugins tie-theme-update"><span class="update-count">'.__( 'New', 'tie' ).'</span></span>','administrator', 'theme-update-notifier' , 'tie_update_notifier');
		}
	}	
}
add_action('admin_menu', 'tie_update_notifier_menu', 99999);


// The notifier page
function tie_update_notifier() { 
	if( function_exists('wp_get_theme') ){
		$xml = tie_get_latest_theme_version(MTHEME_NOTIFIER_CACHE_INTERVAL); // Get the latest remote XML file on our server
		$theme_data = wp_get_theme(); // Read theme current version from the style.css 
	}?>
	<style>
		.update-nag { display: none; }
		#instructions {
			font-size: 110%;
			border-bottom: 4px solid #DADADA;
			padding-bottom:20px;
		}
		#instructions p {
			font-size: 110%;
		}
		#instructions i {
			background: #FFF8D6;
			padding: 0 4px;
		}
		.changelog-data{
			border: 1px solid #DADADA;
			padding : 5px 30px;
		}
		.changelog-data strong{
			display:block;
			font-size:16px;
			color: #333;
			margin: 0 -15px;
		}
		.changelog-data .version{
			padding: 0 20px;
			margin-bottom: 35px;
			border-bottom: 2px solid #DADADA;
		}
		.changelog-data .version span{
			margin: 0 -10px;
			font-weight:bold;
			color: #444;
		}
	</style>

	<div class="wrap">
	
	
		<div id="icon-tools" class="icon32"></div>
		<h2><?php echo THEME_NAME ?> <?php _e( 'Theme Updates', 'tie' ) ?></h2>
		
		<div id="message" class="updated below-h2">
			<p>
				<strong><?php printf( __( 'There is a new version of the %s theme available.', 'tie' ), THEME_NAME ) ?> </strong> <?php printf( __( 'You have version %1$s installed. Update to version %2$s .' ), $theme_data['Version'], $xml->latest ) ?>
			</p>
		</div>
		
		<img style="margin: 0 0 20px 0; border: 1px solid #ddd; max-width:400px; height:auto;" src="<?php echo get_stylesheet_directory_uri() . '/screenshot.png'; ?>" />
					
		<div id="instructions">
		
			<h2><?php _e( 'Updating Automatically', 'tie' ) ?></h2>
			<p><?php _e( 'Envato have developed the <a href="https://github.com/envato/envato-wordpress-toolkit" target="_blank">Envato Toolkit Plugin</a> for WordPress.
				You can use this to receive notification of updates to themes purchased from ThemeForest
				and to automatically update (upon clicking) directly from within your WordPress admin area.', 'tie' ) ?>
			</p>
			<ol>
				<li class="p-bottom"><?php _e( 'Download the <a href="https://github.com/envato/envato-wordpress-toolkit/zipball/master">plugin zip file</a> to your computer.', 'tie' ) ?></li>
				<li class="p-bottom"><?php _e( 'In your WordPress admin area, go to <i>Plugins &gt; Add New</i> then click <i>Upload</i>.', 'tie' ) ?></li>
				<li class="p-bottom"><?php _e( 'Click <i>Choose File</i>, select the plugin zip file you downloaded and click <i>Install Now</i>.', 'tie' ) ?></li>
				<li class="p-bottom"><?php _e( 'After installation, click <i>Activate</i>.', 'tie' ) ?></li>
				<li class="p-bottom"><?php _e( 'Click the new <i>Envato Toolkit</i> link in the menu and follow the instructions to configure the plugin.', 'tie' ) ?></li>
			</ol>
						
			<h2><?php _e( 'Updating Manually', 'tie' ) ?></h2>
			<ol>
				<li class="p-bottom"><?php _e( 'Download the most current version from <a href="http://themeforest.net/downloads?ref=tielabs" target="_blank">ThemeForest</a> in the <i>Downloads</i> area of your account.', 'tie' ) ?></li>
				<li class="p-bottom"><?php printf( __( 'Unzip the package and locate <i>%s.zip</i> in the theme folder.', 'tie' ), THEME_NAME ) ?></li>
				<li class="p-bottom"><?php _e( 'Go to <i>Appearance &gt; Themes</i> and activate another theme such as the default WordPress theme.', 'tie' ) ?></li>
				<li class="p-bottom"><?php printf( __( 'Delete the <i>%s</i> theme which is now inactive.', 'tie' ), THEME_NAME  ) ?></li>
				<li class="p-bottom"><?php printf( __( 'Go to <i>Install Themes &gt; Upload</i> then install and activate <i>%s.zip</i> from the new package.', 'tie' ) , THEME_NAME  ) ?></li>
			</ol>
		</div>
		<br />
		<br />
		<p>
	    <h2 style="font-size:20px;"><?php _e( 'Changelog', 'tie' ) ?></h2>
		<div class="changelog-data tie-css">
			<div>
			<?php
			$changelog = str_replace( "<strong>" , "</div><div class='version'><strong>", $xml->changelog);
			$changelog = str_replace( "Files updated" , "<span>Files updated</span>", $changelog);
			echo nl2br( $changelog ); ?>
			</div>
		</div>
		</p>
	</div>
    
<?php } 



// Get the remote XML file contents and return its data (Version and Changelog)
// Uses the cached version if available and inside the time interval defined
function tie_get_latest_theme_version($interval) {
	$notifier_file_url = NOTIFIER_XML_FILE;	
	$db_cache_field = 'notifier-cache-'.THEME_NAME;
	$db_cache_field_last_updated = 'notifier-cache-last-updated-'.THEME_NAME;
	$last = get_option( $db_cache_field_last_updated );
	$now = time();
	// check the cache
	if ( !$last || (( $now - $last ) > $interval) ) {
		// cache doesn't exist, or is old, so refresh it
		
		$cache = wp_remote_retrieve_body( wp_remote_get( $notifier_file_url , array( 'sslverify' => false ) ) );
				
		if ($cache) {			
			// we got good results	
			update_option( $db_cache_field, $cache );
			update_option( $db_cache_field_last_updated, time() );
		} 
		// read from the cache file
		$notifier_data = get_option( $db_cache_field );
	}
	else {
		// cache file is fresh enough, so read from it
		$notifier_data = get_option( $db_cache_field );
	}
	
	// Let's see if the $xml data was returned as we expected it to.
	// If it didn't, use the default 1.0.0 as the latest version so that we don't have problems when the remote server hosting the XML file is down
	if( strpos((string)$notifier_data, '<notifier>') === false ) {
		$notifier_data = '<?xml version="1.0.0" encoding="UTF-8"?><notifier><latest>1.0.0</latest><changelog></changelog></notifier>';
	}
	
	// Load the remote XML data into a variable and return it
	$xml = @simplexml_load_string($notifier_data); 
	
	return $xml;
}

endif;
