<?php
class duv_latest_cpt extends WP_Widget
{

    /**
     * PHP5 Constructor
     */
    function __construct()
    {

        $widget_ops = array(
                                'classname'     => 'duv_latest_cpt',
                                'description'   => __('Display latests custom posts posts')
                            );
        parent::__construct('lcpt', __('Latest Custom Post posts'), $widget_ops);

    }


    /**
     * Echo the widget content.
     *
     * Subclasses should over-ride this function to generate their widget code.
     *
     * @param array $args       Display arguments including before_title,
     *                              before_widget, and after_widget.
     * @param array $instance   The settings for the particular instance of the
     *                              widget
     */
    function widget($args, $instance)
    {

        extract($args);

        $title  = empty($instance['title']) ? '' : $instance['title'];
        $cpt        = empty($instance['cpt']) ? '' : $instance['cpt'];
        $num        = empty($instance['num']) ? '' : $instance['num'];

        echo $before_widget;

        // display title
        if($title != '') echo '<h2>' . $title .'</h2>';


        global $post;
        $arguments  = array('public' => 'true');
        // retrieve all CPT names that are accessible from non-admin (public)
        $cpt    = get_post_types($arguments, 'names');
        foreach($cpt as $t):
            echo $t;
        endforeach;

        // dispay posts
        if($cpt != ''):
            $q = new WP_Query(array(
                'post_type' => $cpt,
                'showposts' => $num
            ));

            if($q->have_posts()):

                // there are post

                while($q->have_posts()) : $q->the_post();

                    // display information

                endwhile;

                // we outside the loop, need to close a div or sometthing ?


            else:

                // there were no posts

            endif;

        endif;

        echo $after_widget;

    }


    /**
     * Update a particular instance.
     *
     * This function should check taht $new_instance is set correctly.
     * The newly calculated vallue of $instance should be returned.
     * If "false" is returned, the instance won't be saved/updated.
     *
     * @param   array $new_instance     New settings for this instance as input bu the
     *                                      user via form()
     * @param   array $old_instance     Old settings for this instance
     * @return  array                   Settings to save or bool false to cancel saving
     */
    function update($new_instance, $old_instance)
    {

        $instance = $old_instance;

        // title
        $instance['title'] = strip_tags($new_instance['title']);

        // custom post type
        $args   = array('public' => true, '_builtin' => false);
        // retrieve all CPT names that are accessible from non-admin (public)
        $cpt    = get_post_types($args, 'names');
        if(in_array($new_instance['cpt'], $cpt)):
            $instance['cpt'] = $new_instance['cpt'];
        else:
            $instance['cpt'] = '';
        endif;

        // number of post to show
        $instance['num'] = strip_tags($new_instance['num']);

        return $instance;

    }


    /**
     * Echo the settings update form
     *
     * @param array $instance Current settings
     */
    function form($instance)
    {

        $instance = wp_parse_args( (array) $instance, array(
            'title'     => '',
            'cpt'   => '',
            'num'   => '1')
        );
        $title  = esc_attr($instance['title']);
        $cpt        = esc_attr($instance['cpt']);
        $num        = esc_attr($instance['num']);
        ?>

        <!-- TITLE -->
        <p>
            <label for="<?php $this->get_field_id('title'); ?>"><?php _e('Title:'); ?></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>

        <!-- SELECT CUTSTOM POST TYPE -->
        <p>
            <label for"<?php echo $this->get_field_id('cpt'); ?>"><?php _e('Select Custom Post Type'); ?></label>
            <select     class="widefat"
                        name="<?php echo $this->get_field_name('cpt'); ?>"
                        id="<?php echo $this->get_field_id('cpt'); ?>">
                <?php
                $args   = array('public' => true, '_builtin' => false);
                // retrieve all CPT names that are accessible from non-admin (public)
                $cpt    = get_post_types($args, 'names');
                foreach($cpt as $t):
                ?>
                    <option     value="<?php echo $t; ?>"
                                <?php selected($instance['cpt'], $this->get_field_id('cpt')); ?>>
                        <?php _e($t); ?>
                    </option>
                <?php
                endforeach;
                ?>
            </select>
        </p>

        <!-- NUMBER OF POSTS TO SHOW -->
        <p>
            <label for="<?php $this->get_field_id('num'); ?>"><?php _e('Number of posts to show'); ?></label>
            <input  id="<?php echo $this->get_field_id('num'); ?>"
                        name="<?php echo $this->get_field_name('num'); ?>"
                        type="text"
                        value="<?php echo $num ?>"
                        size="2">
            <br />
            <small><?php _e('Tip: enter -1 to show all posts'); ?></small>
        </p>
        <?php

    }

}


function duv_register_widget()
{

    register_widget('duv_latest_cpt');

    do_action('widgets_init');

}

add_action('init', 'duv_register_widget');