class Carousel_Widget extends WP_Widget
{
	function Carousel_Widget()
	{
		if ( !session_id() ) { session_start(); }
		$widget_ops = array('classname' => 'widget_carousel', 'description' => 'A widget that contains rotating widgets' );
		$this->WP_Widget('widget_carousel', 'Carousel of Widgets', $widget_ops);
	}
 
	function widget($args, $instance)
	{
		global $wp_registered_widgets, $wp_registered_sidebars;
		
		$options = get_option("widget_Carousel_widget");
		$sidebars_widgets = wp_get_sidebars_widgets();
		$curSidebar = '';
		
		if ( !isset($_SESSION['default']['curCarouselWidgetName']) )
		{
			$_SESSION['default']['curCarouselWidgetName'] = '';
			$curWidgetName = '';
		}
		else
		{
			$curWidgetName = $_SESSION['default']['curCarouselWidgetName'];
		}
		
		$activeWidgets = array();
		$c = 0;
		$n = 0;
		foreach ( $options as $key => $value )
		{
			if ( ($key == 'widget_Carousel_display') || ($value == 'none') ) { continue; }
						
			if ( ($options['widget_Carousel_display']=='sequence') || ( ($options['widget_Carousel_display']=='random') && ($value != $_SESSION['default']['curCarouselWidgetName']) ) )
			{
				$activeWidgets[] = $value;
				if ( $value == $_SESSION['default']['curCarouselWidgetName'] )
					$n = $c;
			}
			$c++;
		}
				
		if ( $options['widget_Carousel_display']=='sequence' )
		{
			$n++;
			if ( $n > count($activeWidgets)-1 )
				$n = 0;
			$curWidgetNum = $n;
		}
		else
		{
			srand((double) microtime()*1000000);
			$curWidgetNum = rand(0, count($activeWidgets)-1);
		}
		
		$curWidgetName = $activeWidgets[$curWidgetNum]; 
		$_SESSION['default']['curCarouselWidgetName'] = $curWidgetName;
		
		// Find the sidebar
		foreach ( $sidebars_widgets as $sidebar => $widgets )
		{
			if ( $sidebar=='wp_inactive_widgets' ) { continue; }
			foreach ( $widgets as $widget )
			{
				if ( strpos($widget, 'widget_carousel')!==FALSE )
				{
					$curSidebar = $sidebar;
					break;
				}
			}
			if ( $curSidebar != '' ) { break; }
		}
		
		$params = array_merge(
				array( array_merge($wp_registered_sidebars[$curSidebar], array('widget_id' => $id, 'widget_name' => $wp_registered_widgets[$curWidgetName]['name']) ) ),
				(array) $wp_registered_widgets[$curWidgetName]['params']
			);
		
		// Substitute HTML id and class attributes into before_widget
		$classname_ = '';
		foreach ( (array) $wp_registered_widgets[$curWidgetName]['classname'] as $cn )
		{
			if ( is_string($cn) )
				$classname_ .= '_' . $cn;
			elseif ( is_object($cn) )
				$classname_ .= '_' . get_class($cn);
		}
		$classname_ = ltrim($classname_, '_');
		$params[0]['before_widget'] = sprintf($params[0]['before_widget'], $id, $classname_);

		$params = apply_filters( 'dynamic_sidebar_params', $params );
		
		$callback = $wp_registered_widgets[$curWidgetName]['callback'];
		
		if ( is_callable($callback) )
			call_user_func_array($callback, $params);
	}
 
	function update($new_instance, $old_instance)
	{
		for ( $i=1; $i < 11; $i++ )
		{ 
			$options['widget_Carousel_display'] = $_POST['display_sequence'];
			if ( $_POST["widget_Carousel_widget$i"] )
			{
				$options["widget_Carousel_widget$i"] = $_POST["widget_Carousel_widget$i"];
				update_option("widget_Carousel_widget", $options); 
			}
		}		
	}
 
	function form($instance)
	{
		global $wp_registered_widgets, $wp_registered_widget_controls;
		
		$options = get_option("widget_Carousel_widget");
		$availWidgets = array();
		
		echo 'Display:&nbsp;&nbsp;';
		if ( $options['widget_Carousel_display'] == 'random' )
		{
			echo '<input type="radio" name="display_sequence" value="random" id="display_random" checked /> Randomly';
			echo '&nbsp;&nbsp;<input type="radio" name="display_sequence" value="sequence" id="display_sequence"/> Sequential';
		}
		else
		{
			echo '<input type="radio" name="display_sequence" value="random" id="display_random" /> Randomly';
			echo '&nbsp;&nbsp;<input type="radio" name="display_sequence" value="sequence" id="display_sequence" checked /> Sequential';
		}
		
		echo '<table style="margin-top: 10px">';
		
		for ( $i=1; $i < 11; $i++ )
		{ 
			$showForm = TRUE;
			
			echo "<tr><td style=\"text-align: right;\">$i. </td><td><select name=\"widget_Carousel_widget$i\" id=\"widget_Carousel_widget$i\">";
			echo '<option value="none">-- Select a Widget --</option>';
			foreach ( $wp_registered_widgets as $widget )
			{
				if ( strpos($widget['id'], 'widget_carousel')===FALSE )
				{
					echo '<option value="'.$widget['id'].'"';
					if ( $options["widget_Carousel_widget$i"] == $widget['id'] )
					{
						echo ' selected ';
					}
					echo '>'.$widget['name'].'</option>';
					$availWidgets[] = $widget['id'];
				}
			}
			
			//echo '</select><input type="button" value="..." onclick="showCarouselWidgetPrefs(\'widget_carousel_\'+document.getElementById(\'widget_Carousel_widget'.$i.'\').value)"></td></tr>';
			echo '</select><input type="button" value="..." onclick="document.location.href=\'widgets.php?editwidget=\'+document.getElementById(\'widget_Carousel_widget'.$i.'\').value"></td></tr>';
		}
		echo '</table>';
		
		echo "  <script type=\"text/javascript\" charset=\"utf-8\">
					function showCarouselWidgetPrefs(id)
					{
						alert(id);
						obj = document.getElementById(id);
						if ( obj )
							obj.style.display = 'block';
						else
							alert('not found');
					}
				</script>";
				
				
		echo '<div>';
		foreach ( $availWidgets as $widget )
		{
			echo "\n<!-- CONTROL FORM $widget -->";
			$control = $wp_registered_widget_controls[$widget];
			echo '<div id="widget_carousel_'.$widget.'" style="display: block;">';
			//call_user_func_array($control['callback'], $control['params'] );
			echo '</div>';
		}
		echo '</div>';
		
	}
}

function load_custom_widgets()
{
	register_widget('Carousel_Widget');
}

add_action( 'widgets_init', 'load_custom_widgets' );