<?php

class Perth_Video_Widget extends WP_Widget {

    function perth_video_widget() {
		$widget_ops = array('classname' => 'perth_video_widget_widget', 'description' => __( 'Display a video from Youtube, Vimeo etc.', 'perth') );
        parent::__construct(false, $name = __('Perth: Video', 'perth'), $widget_ops);
		$this->alt_option_name = 'perth_video_widget';
		
		add_action( 'save_post', array($this, 'flush_widget_cache') );
		add_action( 'deleted_post', array($this, 'flush_widget_cache') );
		add_action( 'switch_theme', array($this, 'flush_widget_cache') );		
    }
	
	function form($instance) {
		$title  = isset( $instance['title'] ) ? esc_attr( $instance['title'] ) : '';
		$url    = isset( $instance['url'] ) ? esc_url( $instance['url'] ) : '';
	?>

	<p>
	<label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title', 'perth'); ?></label>
	<input class="widefat" id="<?php echo $this->get_field_id('title'); ?>" name="<?php echo $this->get_field_name('title'); ?>" type="text" value="<?php echo $title; ?>" />
	</p>

	<p><label for="<?php echo $this->get_field_id( 'url' ); ?>"><?php _e( 'Paste the URL of the video (only from a network that supports oEmbed, like Youtube, Vimeo etc.):', 'perth' ); ?></label>
	<input class="widefat" id="<?php echo $this->get_field_id( 'url' ); ?>" name="<?php echo $this->get_field_name( 'url' ); ?>" type="text" value="<?php echo $url; ?>" size="3" /></p>
	
	<?php
	}

	function update($new_instance, $old_instance) {
		$instance = $old_instance;
		$instance['title'] = strip_tags($new_instance['title']);
		$instance['url'] = esc_url_raw($new_instance['url']);
		$this->flush_widget_cache();

		$alloptions = wp_cache_get( 'alloptions', 'options' );
		if ( isset($alloptions['perth_video_widget']) )
			delete_option('perth_video_widget');		  
		  
		return $instance;
	}
	
	function flush_widget_cache() {
		wp_cache_delete('perth_video_widget', 'widget');
	}
	
	function widget($args, $instance) {
		$cache = array();
		if ( ! $this->is_preview() ) {
			$cache = wp_cache_get( 'perth_video_widget', 'widget' );
		}

		if ( ! is_array( $cache ) ) {
			$cache = array();
		}

		if ( ! isset( $args['widget_id'] ) ) {
			$args['widget_id'] = $this->id;
		}

		if ( isset( $cache[ $args['widget_id'] ] ) ) {
			echo $cache[ $args['widget_id'] ];
			return;
		}

		ob_start();
		extract($args);

		$title = ( ! empty( $instance['title'] ) ) ? $instance['title'] : '';
		$title = apply_filters( 'widget_title', $title, $instance, $this->id_base );
		$url   = isset( $instance['url'] ) ? esc_url( $instance['url'] ) : '';

		echo $before_widget;
		
		if ( $title ) echo $before_title . $title . $after_title;
		
		if( ($url) ) {
			echo wp_oembed_get($url);
		}
		echo $after_widget;


		if ( ! $this->is_preview() ) {
			$cache[ $args['widget_id'] ] = ob_get_flush();
			wp_cache_set( 'perth_video_widget', $cache, 'widget' );
		} else {
			ob_end_flush();
		}
	}
	
}