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<?php
/**
 * Makes a custom Widget for displaying Aside, Link, Status, and Quote Posts available with Twenty Eleven
 *
 * Learn more: http://codex.wordpress.org/Widgets_API#Developing_Widgets
 *
 * @package WordPress
 * @subpackage Twenty_Eleven
 * @since Twenty Eleven 1.0
 */
class Twenty_Eleven_Ephemera_Widget extends WP_Widget {


    /**
     * Constructor
     *
     * @return void
     **/
    function Twenty_Eleven_Ephemera_Widget() {
        $widget_ops = array( 'classname' => 'widget_twentyeleven_ephemera', 'description' => __( 'Use this widget to list your recent Aside, Status, Quote, and Link posts', 'twentyeleven' ) );
        $this->WP_Widget( 'widget_twentyeleven_ephemera', __( 'Twenty Eleven Ephemera', 'twentyeleven' ), $widget_ops );
        $this->alt_option_name = 'widget_twentyeleven_ephemera';


        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' ) );
    }


    /**
     * Outputs the HTML for this widget.
     *
     * @param array An array of standard parameters for widgets in this theme
     * @param array An array of settings for this widget instance
     * @return void Echoes it's output
     **/
    function widget( $args, $instance ) {
        $cache = wp_cache_get( 'widget_twentyeleven_ephemera', 'widget' );


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


        if ( ! isset( $args['widget_id'] ) )
            $args['widget_id'] = null;


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


        ob_start();
        extract( $args, EXTR_SKIP );


        $title = apply_filters( 'widget_title', empty( $instance['title'] ) ? __( 'Ephemera', 'twentyeleven' ) : $instance['title'], $instance, $this->id_base);


        if ( ! isset( $instance['number'] ) )
            $instance['number'] = '10';


        if ( ! $number = absint( $instance['number'] ) )
             $number = 10;


        $ephemera_args = array(
            'order' => 'DESC',
            'posts_per_page' => $number,
            'no_found_rows' => true,
            'post_status' => 'publish',
            'post__not_in' => get_option( 'sticky_posts' ),
            'tax_query' => array(
                array(
                    'taxonomy' => 'post_format',
                    'terms' => array( 'post-format-aside', 'post-format-link', 'post-format-status', 'post-format-quote' ),
                    'field' => 'slug',
                    'operator' => 'IN',
                ),
            ),
        );
        $ephemera = new WP_Query( $ephemera_args );


        if ( $ephemera->have_posts() ) :


        echo $before_widget;
        echo $before_title;
        echo $title; // Can set this with a widget option, or omit altogether
        echo $after_title;


        ?>
        <ol>
        <?php while ( $ephemera->have_posts() ) : $ephemera->the_post(); ?>


            <?php if ( 'link' != get_post_format() ) : ?>


            <li class="widget-entry-title">
                <a href="<?php echo esc_url( get_permalink() ); ?>" title="<?php printf( esc_attr__( 'Permalink to %s', 'twentyeleven' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?></a>
                <span class="comments-link">
                    <?php comments_popup_link( __( '0 <span class="reply">comments &rarr;</span>', 'twentyeleven' ), __( '1 <span class="reply">comment &rarr;</span>', 'twentyeleven' ), __( '% <span class="reply">comments &rarr;</span>', 'twentyeleven' ) ); ?>
                </span>
            </li>


            <?php else : ?>


            <li class="widget-entry-title">
                <?php
                    // Grab first link from the post content. If none found, use the post permalink as fallback.
                    $link_url = twentyeleven_url_grabber();


                    if ( empty( $link_url ) )
                        $link_url = get_permalink();
                ?>
                <a href="<?php echo esc_url( $link_url ); ?>" title="<?php printf( esc_attr__( 'Link to %s', 'twentyeleven' ), the_title_attribute( 'echo=0' ) ); ?>" rel="bookmark"><?php the_title(); ?>&nbsp;<span>&rarr;</span></a>
                <span class="comments-link">
                    <?php comments_popup_link( __( '0 <span class="reply">comments &rarr;</span>', 'twentyeleven' ), __( '1 <span class="reply">comment &rarr;</span>', 'twentyeleven' ), __( '% <span class="reply">comments &rarr;</span>', 'twentyeleven' ) ); ?>
                </span>
            </li>


            <?php endif; ?>


        <?php endwhile; ?>
        </ol>
        <?php


        echo $after_widget;


        // Reset the post globals as this query will have stomped on it
        wp_reset_postdata();


        // end check for ephemeral posts
        endif;


        $cache[$args['widget_id']] = ob_get_flush();
        wp_cache_set( 'widget_twentyeleven_ephemera', $cache, 'widget' );
    }


    /**
     * Deals with the settings when they are saved by the admin. Here is
     * where any validation should be dealt with.
     **/
    function update( $new_instance, $old_instance ) {
        $instance = $old_instance;
        $instance['title'] = strip_tags( $new_instance['title'] );
        $instance['number'] = (int) $new_instance['number'];
        $this->flush_widget_cache();


        $alloptions = wp_cache_get( 'alloptions', 'options' );
        if ( isset( $alloptions['widget_twentyeleven_ephemera'] ) )
            delete_option( 'widget_twentyeleven_ephemera' );


        return $instance;
    }


    function flush_widget_cache() {
        wp_cache_delete( 'widget_twentyeleven_ephemera', 'widget' );
    }


    /**
     * Displays the form for this widget on the Widgets page of the WP Admin area.
     **/
    function form( $instance ) {
        $title = isset( $instance['title']) ? esc_attr( $instance['title'] ) : '';
        $number = isset( $instance['number'] ) ? absint( $instance['number'] ) : 10;
?>
            <p><label for="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>"><?php _e( 'Title:', 'twentyeleven' ); ?></label>
            <input class="widefat" id="<?php echo esc_attr( $this->get_field_id( 'title' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'title' ) ); ?>" type="text" value="<?php echo esc_attr( $title ); ?>" /></p>


            <p><label for="<?php echo esc_attr( $this->get_field_id( 'number' ) ); ?>"><?php _e( 'Number of posts to show:', 'twentyeleven' ); ?></label>
            <input id="<?php echo esc_attr( $this->get_field_id( 'number' ) ); ?>" name="<?php echo esc_attr( $this->get_field_name( 'number' ) ); ?>" type="text" value="<?php echo esc_attr( $number ); ?>" size="3" /></p>
        <?php
    }
}