<?php
/**
* This file handles the custom meta boxes found on posts and pages.
*/

// post fields
$post_fields = array(
    array(
        'name' => 'Sub Title',
        'desc' => 'Give this post a sub title?',
        'id' => 'subtitle',
        'type' => 'text',
        'std' => ''
    ),
    array(
        'name' => 'Additional Details',
        'desc' => 'Enter extra post details here',
        'id' => 'add_details',
        'type' => 'textarea',
        'std' => ''
    ),
    array(
        'name' => 'Choose a Fruit',
        'id' => 'fruit',
        'type' => 'select',
        'options' => array('Apples', 'Oranges', 'Pears', 'Pineapples')
    ),
    array(
        'name' => 'Check 1',
        'id' => 'check1',
        'type' => 'checkbox',
    ),
    array(
        'name' => 'Check 2',
        'id' => 'check2',
        'type' => 'checkbox',
    ),
    array(
        'name' => 'Check 3',
        'id' => 'check3',
        'type' => 'checkbox',
    ),
);

// page fields
$page_fields = array(
    array(
        'name' => 'Sub Title',
        'desc' => 'Give this post a sub title?',
        'id' => 'subtitle',
        'type' => 'text',
        'std' => ''
    ),
/*  array(
        'name' => 'Additional Details',
        'desc' => 'Enter extra post details here',
        'id' => 'add_details',
        'type' => 'textarea',
        'std' => ''
    ),
    array(
        'name' => 'Choose a Fruit',
        'id' => 'fruit',
        'type' => 'select',
        'options' => array('Apples', 'Oranges', 'Pears', 'Pineapples')
    ),
    array(
        'name' => 'Check 1',
        'id' => 'check1',
        'type' => 'checkbox',
    ),
    array(
        'name' => 'Check 2',
        'id' => 'check2',
        'type' => 'checkbox',
    ),
    array(
        'name' => 'Check 3',
        'id' => 'check3',
        'type' => 'checkbox',
    ),
*/
);

// Add meta box to editor
function rsgwd_meta_add_box() {
    global $post, $meta_box, $post_fields, $page_fields;

    $post_type = $post->post_type;

    switch($post_type) {
        case "post":
            $meta_box = array(
                'id' => 'post_meta_box', // the id of our meta box
                'title' => 'Post Options', // the title of the meta box
                'page' => $post_type, // display this meta box on post editing screens
                'context' => 'normal',
                'priority' => 'high', // keep it near the top
                'fields' => $post_fields
            );
            add_meta_box($meta_box['id'], $meta_box['title'], 'display_html', $meta_box['page'], $meta_box['context'], $meta_box['priority']);
            break;
        case "page":
            $meta_box = array(
                'id' => 'page_meta_box', // the id of our meta box
                'title' => 'Page Options', // the title of the meta box
                'page' => $post_type, // display this meta box on post editing screens
                'context' => 'normal',
                'priority' => 'high', // keep it near the top
                'fields' => $page_fields
            );
            add_meta_box($meta_box['id'], $meta_box['title'], 'display_html', $meta_box['page'], $meta_box['context'], $meta_box['priority']);
            break;
        default:
            break;
    }
}
add_action('add_meta_boxes', 'rsgwd_meta_add_box');

// Callback function to show fields in meta box
function display_html() {
    global $meta_box, $post; // get the variables from global $meta_box and $post

    // Use nonce for verification to check that the person has adequate priveleges
    echo '<input type="hidden" name="rsgwd_meta_box_nonce" value="', wp_create_nonce(basename(__FILE__)), '" />';

    // create the table which the options will be displayed in
    echo '<table class="form-table">';

    foreach ($meta_box['fields'] as $field) { // do this for each array inside of the fields array

        // 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': // the HTML to display for type=text options
                echo '<input type="text" name="', $field['id'], '" id="', $field['id'], '" value="', $meta ? $meta : $field['std'], '" size="30" style="width:97%" />', '', $field['desc'];
                break;
            case 'textarea': // the HTML to display for type=textarea options
                echo '<textarea name="', $field['id'], '" id="', $field['id'], '" cols="60" rows="8" style="width:97%">', $meta ? $meta : $field['std'], '</textarea>', '', $field['desc'];
                break;
            case 'select': // the HTML to display for type=select options
                echo '<select name="', $field['id'], '" id="', $field['id'], '">';
                foreach ($field['options'] as $option) {echo '<option', $meta == $option ? ' selected="selected"' : '', '>', $option, '</option>';}
                echo '</select>';
                break;
            case 'radio': // the HTML to display for type=radio options
                foreach ($field['options'] as $option) {echo '<input type="radio" name="', $field['id'], '" value="', $option['value'], '"', $meta == $option['value'] ? ' checked="checked"' : '', ' />', $option['name'];}
                break;
            case 'checkbox': // the HTML to display for type=checkbox options
                echo '<input type="checkbox" name="', $field['id'], '" id="', $field['id'], '"', $meta ? ' checked="checked"' : '', ' />';
                break;
        }
        echo '<td>','</tr>';
    }
    echo '</table>';

    // echo "<pre>"; var_dump($meta_box['fields']); echo "</pre>";
}

// Save data from meta box
function rsgwd_meta_save_data($post_id) {
    global $meta_box;

    // echo "<pre>"; var_dump($meta_box); echo "</pre>";

    // verify nonce -- checks that the user has access
    if (!wp_verify_nonce($_POST['rsgwd_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 ($meta_box['fields'] as $field) { // save each option
        $old = get_post_meta($post_id, $field['id'], true);
        $new = $_POST[$field['id']];

        if ($new && $new != $old) { // compare changes to existing values
            update_post_meta($post_id, $field['id'], $new);
        } elseif ('' == $new && $old) {
            delete_post_meta($post_id, $field['id'], $old);
        }
    }
}
add_action('save_post', 'rsgwd_meta_save_data'); // save the data

?>