<?php

/* *
 * Modified version of this: http://loak.pastebin.com/u9YTQrxf (from http://www.deluxeblogtips.com/2010/05/howto-meta-box-wordpress.html)
 * Modification to allow for incremental versions of the same metabox.
*/

/* Set up some default variables. */
 $i = 1;
    $prefix = "slide{$i}-";
 $number_of_boxes = 15;

/* Loop through the boxes to create as many as you want. */
while ( ++$i <= $number_of_boxes ) {

    $prefix = "lom_slide_{$i}_";

    $meta_boxes[] = array(
        'id' => "my-meta-box-{$i}",
        'title' => sprintf( 'Slide %s', $i ),
        'pages' => array( 'lom_slideshow','' ), // multiple post types
        'context' => 'normal',
        'priority' => 'high',
        'fields' => array(
            array( 'name' => 'Slide Title', 'desc' => 'Enter the title of the slide here', 'id' => $prefix . 'title',   'type' => 'text' ),
            array( 'name' => 'Slide Description', 'desc' => 'Provide a brief description of the picture or video',  'id' => $prefix . 'textarea', 'type' => 'textarea' ),
            array( 'name' => 'Slide Image', 'desc' => 'Enter the URL of the image here',    'id' => $prefix . 'image', 'type' => 'text' ),
            array( 'name' => 'Slide Embed Code', 'desc' => 'Insert embed code for the video', 'id' => $prefix .  'embed', 'type' => 'textarea' ),
            array( 'name' => 'Hide Slide', 'id' => $prefix . 'checkbox', 'type' => 'checkbox' )
        )
    );
}





/*********************************
Setup Class
*********************************/

foreach ($meta_boxes as $meta_box) {
    $my_box = new My_meta_box($meta_box);
}

class My_meta_box {

    protected $_meta_box;

    // create meta box based on given data
    function __construct($meta_box) {
        if (!is_admin()) return;

        $this->_meta_box = $meta_box;

        // fix upload bug: http://www.hashbangcode.com/blog/add-enctype-wordpress-post-and-page-forms-471.html
        $current_page = substr(strrchr($_SERVER['PHP_SELF'], '/'), 1, -4);
        if ($current_page == 'page' || $current_page == 'page-new' || $current_page == 'post' || $current_page == 'post-new') {
            add_action('admin_head', array(&$this, 'add_post_enctype'));
        }

        add_action('admin_menu', array(&$this, 'add'));

        add_action('save_post', array(&$this, 'save'));
    }

    function add_post_enctype() {
        echo '
        <script type="text/javascript">
        jQuery(document).ready(function(){
            jQuery("#post").attr("enctype", "multipart/form-data");
            jQuery("#post").attr("encoding", "multipart/form-data");
        });
        </script>';
    }

    /// Add meta box for multiple post types
    function add() {
        foreach ($this->_meta_box['pages'] as $page) {
            add_meta_box($this->_meta_box['id'], $this->_meta_box['title'], array(&$this, 'show'), $page, $this->_meta_box['context'], $this->_meta_box['priority']);
        }
    }

    // Callback function to show fields in meta box
    function show() {
        global $post;

        // Use nonce for verification
        echo '<input type="hidden" name="mytheme_meta_box_nonce" value="', wp_create_nonce(basename(__FILE__)), '" />';

        echo '<table class="form-table">';

        foreach ($this->_meta_box['fields'] as $field) {
            // get current post meta data
            $meta = get_post_meta($post->ID, $field['id'], true);

            echo '<tr>',
                    '<th style="width:20%"><label for="', $field['id'], '">', $field['name'], '</label></th>',
                    '<td>';
            switch ($field['type']) {
                case 'text':
                    echo '<input type="text" name="', $field['id'], '" id="', $field['id'], '" value="', $meta ? $meta : $field['std'], '" size="30" style="width:97%" />',
                        '<br />', $field['desc'];
                    break;
                case 'textarea':
                    echo '<textarea name="', $field['id'], '" id="', $field['id'], '" cols="60" rows="4" style="width:97%">', $meta ? $meta : $field['std'], '</textarea>',
                        '<br />', $field['desc'];
                    break;
                case 'select':
                    echo '<select name="', $field['id'], '" id="', $field['id'], '">';
                    foreach ($field['options'] as $option) {
                        echo '<option', $meta == $option ? ' selected="selected"' : '', '>', $option, '</option>';
                    }
                    echo '</select>';
                    break;
                case 'radio':
                    foreach ($field['options'] as $option) {
                        echo '<input type="radio" name="', $field['id'], '" value="', $option['value'], '"', $meta == $option['value'] ? ' checked="checked"' : '', ' />', $option['name'];
                    }
                    break;
                case 'checkbox':
                    echo '<input type="checkbox" name="', $field['id'], '" id="', $field['id'], '"', $meta ? ' checked="checked"' : '', ' />';
                    break;
                case 'file':
                    echo $meta ? "$meta<br />" : '', '<input type="file" name="', $field['id'], '" id="', $field['id'], '" />',
                        '<br />', $field['desc'];
                    break;
                case 'image':
                    echo $meta ? "<img src=\"$meta\" width=\"150\" height=\"150\" /><br />$meta<br />" : '', '<input type="file" name="', $field['id'], '" id="', $field['id'], '" />',
                        '<br />', $field['desc'];
                    break;
            }
            echo    '<td>',
                '</tr>';
        }

        echo '</table>';
    }

    // Save data from meta box
    function save($post_id) {
        // verify nonce
        if (!wp_verify_nonce($_POST['mytheme_meta_box_nonce'], basename(__FILE__))) {
            return $post_id;
        }

        // check autosave
        if (defined('DOING_AUTOSAVE') && DOING_AUTOSAVE) {
            return $post_id;
        }

        // check permissions
        if ('page' == $_POST['post_type']) {
            if (!current_user_can('edit_page', $post_id)) {
                return $post_id;
            }
        } elseif (!current_user_can('edit_post', $post_id)) {
            return $post_id;
        }

        foreach ($this->_meta_box['fields'] as $field) {
            $name = $field['id'];

            $old = get_post_meta($post_id, $name, true);
            $new = $_POST[$field['id']];

            if ($field['type'] == 'file' || $field['type'] == 'image') {
                $file = wp_handle_upload($_FILES[$name], array('test_form' => false));
                $new = $file['url'];
            }

            if ($new && $new != $old) {
                update_post_meta($post_id, $name, $new);
            } elseif ('' == $new && $old && $field['type'] != 'file' && $field['type'] != 'image') {
                delete_post_meta($post_id, $name, $old);
            }
        }
    }
}
?>