<?php

/**

 * The custom background script.

 *

 * @package WordPress

 * @subpackage Administration

 */

/**

 * The custom background class.

 *

 * @since 3.0.0

 */

class Custom_Background {

	/**

	 * Callback for administration header.

	 *

	 * @since 3.0.0

	 */

	public $admin_header_callback;

	/**

	 * Callback for header div.

	 *

	 * @since 3.0.0

	 */

	public $admin_image_div_callback;

	/**

	 * @var bool

	 */

	private $updated;

	/**

	 * Constructor - Register administration header callback.

	 *

	 * @since 3.0.0

	 */

	public function __construct($admin_header_callback = '', $admin_image_div_callback = '') {

		$this->admin_header_callback = $admin_header_callback;

		$this->admin_image_div_callback = $admin_image_div_callback;

		add_action( 'admin_menu', array( $this, 'init' ) );

		add_action( 'wp_ajax_custom-background-add', array( $this, 'ajax_background_add' ) );

		// Unused since 3.5.0.

		add_action( 'wp_ajax_set-background-image', array( $this, 'wp_set_background_image' ) );

	}

	/**

	 * Set up the hooks for the Custom Background admin page.

	 *

	 * @since 3.0.0

	 */

	public function init() {

		$page = add_theme_page( __( 'Background' ), __( 'Background' ), 'edit_theme_options', 'custom-background', array( $this, 'admin_page' ) );

		if ( ! $page ) {

			return;

		}

		add_action( "load-$page", array( $this, 'admin_load' ) );

		add_action( "load-$page", array( $this, 'take_action' ), 49 );

		add_action( "load-$page", array( $this, 'handle_upload' ), 49 );

		if ( $this->admin_header_callback ) {

			add_action( "admin_head-$page", $this->admin_header_callback, 51 );

		}

	}

	/**

	 * Set up the enqueue for the CSS & JavaScript files.

	 *

	 * @since 3.0.0

	 */

	public function admin_load() {

		get_current_screen()->add_help_tab( array(

			'id'      => 'overview',

			'title'   => __('Overview'),

			'content' =>

				'<p>' . __( 'You can customize the look of your site without touching any of your theme&#8217;s code by using a custom background. Your background can be an image or a color.' ) . '</p>' .

				'<p>' . __( 'To use a background image, simply upload it or choose an image that has already been uploaded to your Media Library by clicking the &#8220;Choose Image&#8221; button. You can display a single instance of your image, or tile it to fill the screen. You can have your background fixed in place, so your site content moves on top of it, or you can have it scroll with your site.' ) . '</p>' .

				'<p>' . __( 'You can also choose a background color by clicking the Select Color button and either typing in a legitimate HTML hex value, e.g. &#8220;#ff0000&#8221; for red, or by choosing a color using the color picker.' ) . '</p>' .

				'<p>' . __( 'Don&#8217;t forget to click on the Save Changes button when you are finished.' ) . '</p>'

		) );

		get_current_screen()->set_help_sidebar(

			'<p><strong>' . __( 'For more information:' ) . '</strong></p>' .

		);

		wp_enqueue_media();

		wp_enqueue_script('custom-background');

		wp_enqueue_style('wp-color-picker');

	}

	/**

	 * Execute custom background modification.

	 *

	 * @since 3.0.0

	 */

	public function take_action() {

		if ( empty($_POST) )

			return;

		if ( isset($_POST['reset-background']) ) {

			check_admin_referer('custom-background-reset', '_wpnonce-custom-background-reset');

			remove_theme_mod('background_image');

			remove_theme_mod('background_image_thumb');

			$this->updated = true;

			return;

		}

		if ( isset($_POST['remove-background']) ) {

			// @TODO: Uploaded files are not removed here.

			check_admin_referer('custom-background-remove', '_wpnonce-custom-background-remove');

			set_theme_mod('background_image', '');

			set_theme_mod('background_image_thumb', '');

			$this->updated = true;

			wp_safe_redirect( $_POST['_wp_http_referer'] );

			return;

		}

		}

		}

		}

		if ( isset($_POST['background-color']) ) {

			check_admin_referer('custom-background');

			$color = preg_replace('/[^0-9a-fA-F]/', '', $_POST['background-color']);

			if ( strlen($color) == 6 || strlen($color) == 3 )

				set_theme_mod('background_color', $color);

			else

				set_theme_mod('background_color', '');

		}

		$this->updated = true;

	}

	/**

	 * Display the custom background page.

	 *

	 * @since 3.0.0

	 */

	public function admin_page() {

?>

<div class="wrap" id="custom-background">

<?php if ( current_user_can( 'customize' ) ) { ?>

<div class="notice notice-info hide-if-no-customize">

	<p>

		<?php

		printf(

			__( 'You can now manage and live-preview Custom Backgrounds in the <a href="%1$s">Customizer</a>.' ),

			admin_url( 'customize.php?autofocus[control]=background_image' )

		);

		?>

	</p>

</div>

<?php } ?>

<?php if ( ! empty( $this->updated ) ) { ?>

<div id="message" class="updated">

<p><?php printf( __( 'Background updated. <a href="%s">Visit your site</a> to see how it looks.' ), home_url( '/' ) ); ?></p>

</div>

<?php } ?>

<h3><?php _e( 'Background Image' ); ?></h3>

<table class="form-table">

<tbody>

<tr>

<th scope="row"><?php _e( 'Preview' ); ?></th>

<td>

	<?php

	if ( $this->admin_image_div_callback ) {

		call_user_func( $this->admin_image_div_callback );

	} else {

		$background_styles = '';

		if ( $bgcolor = get_background_color() )

			$background_styles .= 'background-color: #' . $bgcolor . ';';

		$background_image_thumb = get_background_image();

		if ( $background_image_thumb ) {

			$background_image_thumb = esc_url( set_url_scheme( get_theme_mod( 'background_image_thumb', str_replace( '%', '%%', $background_image_thumb ) ) ) );

			// Background-image URL must be single quote, see below.

		}

	?>

	<div id="custom-background-image" style="<?php echo $background_styles; ?>"><?php // must be double quote, see above ?>

		<?php if ( $background_image_thumb ) { ?>

		<img class="custom-background-image" src="<?php echo $background_image_thumb; ?>" style="visibility:hidden;" alt="" /><br />

		<img class="custom-background-image" src="<?php echo $background_image_thumb; ?>" style="visibility:hidden;" alt="" />

		<?php } ?>

	</div>

	<?php } ?>

</td>

</tr>

<?php if ( get_background_image() ) : ?>

<tr>

<th scope="row"><?php _e('Remove Image'); ?></th>

<td>

<form method="post">

<?php wp_nonce_field('custom-background-remove', '_wpnonce-custom-background-remove'); ?>

<?php _e('This will remove the background image. You will not be able to restore any customizations.') ?>

</form>

</td>

</tr>

<?php endif; ?>

<?php $default_image = get_theme_support( 'custom-background', 'default-image' ); ?>

<?php if ( $default_image && get_background_image() != $default_image ) : ?>

<tr>

<th scope="row"><?php _e('Restore Original Image'); ?></th>

<td>

<form method="post">

<?php wp_nonce_field('custom-background-reset', '_wpnonce-custom-background-reset'); ?>

<?php _e('This will restore the original background image. You will not be able to restore any customizations.') ?>

</form>

</td>

</tr>

<?php endif; ?>

<tr>

<th scope="row"><?php _e('Select Image'); ?></th>

<td><form enctype="multipart/form-data" id="upload-form" class="wp-upload-form" method="post">

	<p>

		<label for="upload"><?php _e( 'Choose an image from your computer:' ); ?></label><br />

		<input type="file" id="upload" name="import" />

		<input type="hidden" name="action" value="save" />

		<?php wp_nonce_field( 'custom-background-upload', '_wpnonce-custom-background-upload' ); ?>

	</p>

	<p>

		<label for="choose-from-library-link"><?php _e( 'Or choose an image from your media library:' ); ?></label><br />

		<button id="choose-from-library-link" class="button"

			data-choose="<?php esc_attr_e( 'Choose a Background Image' ); ?>"

			data-update="<?php esc_attr_e( 'Set as background' ); ?>"><?php _e( 'Choose Image' ); ?></button>

	</p>

	</form>

</td>

</tr>

</tbody>

</table>

<form method="post">

<table class="form-table">

<tbody>

<?php if ( get_background_image() ) : ?>

<tr>

</fieldset></td>

</tr>

<tr>