<?php
/**
 * Class NY_OG_Admin
 */
// If this file is called directly, abort.
if ( !defined( 'ABSPATH' ) ) {
    die();
}

class NY_OG_Admin {

    public function __construct() {
        add_action( 'add_meta_boxes', array( $this, 'add_og_custom_box' ) );
        add_action( 'save_post', array( $this, '_save_postdata' ) );
    }

    public function add_og_custom_box() {
        add_meta_box( 'ny_open_graph', 'Open Graph Data', array(
            $this,
            'og_custom_box',
                ), '', 'advanced', 'default' );
    }

    public function og_custom_box( $post ) {
        $metatitle       = get_post_meta( $post->ID, '_og_title', true );
        $metadescription = get_post_meta( $post->ID, '_og_description', true );
        $metatype        = get_post_meta( $post->ID, '_og_type', true );
        ?>		
        <table>
            <tr>
                <td>
                    <label for="ny_og_title">Facebook snippet preview:</label>
                </td>
                <td>
                    <?php echo $this->_fb_snippet() ?>
                </td>
            </tr>
            <tr>
                <td>
                    <label for="ny_og_title">Open Graph Title:</label>
                </td>
                <td>
                    <input type="text" style="width:510px;" id="ny_og_title" name="ny_og_title" value="<?php if ( $metatitle != FALSE ) echo $metatitle; ?>" size="90" />
                </td>
            </tr>
            <tr>
                <td>
                    <label for="ny_og_description">Open Graph Description:</label>
                </td>
                <td>
                    <textarea rows="3" style="width:510px;" cols="72" id="ny_og_description" name="ny_og_description"><?php if ( $metadescription != FALSE ) echo $metadescription; ?></textarea>
                </td> 
            </tr>
            <tr>
                <td>
                    <label for="ny_og_type">Open Graph Type(default type: 'article'):</label>
                </td>
                <td>
                    <input type="text" style="width:510px;" id="ny_og_type" name="ny_og_type" value="<?php if ( $metatype != FALSE ) echo $metatype; ?>" size="70" />
                </td> 
            </tr>
        </table>
        <?php
    }

    public function _save_postdata( $post_id ) {
        $title       = $_POST['ny_og_title'];
        $description = $_POST['ny_og_description'];
        $type        = $_POST['ny_og_type'];

        $allpostmeta = get_post_custom( $post_id );
        if ( array_key_exists( '_og_title', $allpostmeta ) ) {
            update_post_meta( $post_id, '_og_title', $title );
        } else {
            add_post_meta( $post_id, '_og_title', $title, true );
        }
        if ( array_key_exists( '_og_type', $allpostmeta ) ) {
            update_post_meta( $post_id, '_og_type', $type );
        } else {
            add_post_meta( $post_id, '_og_type', $type, true );
        }
        if ( array_key_exists( '_og_description', $allpostmeta ) ) {
            update_post_meta( $post_id, '_og_description', $description );
        } else {
            add_post_meta( $post_id, '_og_description', $description, true );
        }
    }

    function _fb_snippet() {
        if ( isset( $_GET['post'] ) ) {
            $post_id = ( int ) $_GET['post'];
        }

        global $NY_OG_Output;
        $content = '<div id="wp_og_snippet" style="background-color: #fff;border: 2px solid #283e6c;width:488px;padding: 10px;">';
        $content .= '<div style="height: 100px;float: left; margin-right:10px">' . $NY_OG_Output->_add_image( true ) . '</div>';
        $content .= '<div><span style="color: #333;font-weight: bold;font-size: 14px;">' . $NY_OG_Output->_get_title() . '</span><br />';
        $content .= '<a href="' . get_permalink( $post_id ) . '" target="_blank" style="font-size: 12px;color: #808080; text-decoration:none;" class="url">' . get_permalink( $post_id ) . '</a>';
        $content .= '<p class="desc" style="width:420px;margin-top: 5px; font-size: 13px; color: #333;">' . $NY_OG_Output->_get_description() . '</p></div>';
        $content .= '</div>';

        return $content;
    }

}