<?php
/**
* The block editor page.
*
* @since 5.0.0
*
* @package WordPress
* @subpackage Administration
*/

// Don't load directly.
if ( ! defined( 'ABSPATH' ) ) {
die( '-1' );
}

/**
* @global string $post_type Global post type.
* @global WP_Post_Type $post_type_object Global post type object.
* @global WP_Post $post Global post object.
* @global string $title The title of the current screen.
* @global array $wp_meta_boxes Global meta box state.
*/
global $post_type, $post_type_object, $post, $title, $wp_meta_boxes;

$block_editor_context = new WP_Block_Editor_Context( array( 'post' => $post ) );

// Flag that we're loading the block editor.
$current_screen = get_current_screen();
$current_screen->is_block_editor( true );

// Default to is-fullscreen-mode to avoid jumps in the UI.
add_filter(
'admin_body_class',
static function ( $classes ) {
return "$classes is-fullscreen-mode";
}
);

/*
* Emoji replacement is disabled for now, until it plays nicely with React.
*/
remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );

/*
* Block editor implements its own Options menu for toggling Document Panels.
*/
add_filter( 'screen_options_show_screen', '__return_false' );

wp_enqueue_script( 'heartbeat' );
wp_enqueue_script( 'wp-edit-post' );

$rest_path = rest_get_route_for_post( $post );

$active_theme = get_stylesheet();

// Preload common data.
$preload_paths = array(
'/wp/v2/types?context=view',
'/wp/v2/taxonomies?context=view',
add_query_arg( 'context', 'edit', $rest_path ),
sprintf( '/wp/v2/types/%s?context=edit', $post_type ),
'/wp/v2/users/me',
array( rest_get_route_for_post_type_items( 'attachment' ), 'OPTIONS' ),
array( rest_get_route_for_post_type_items( 'page' ), 'OPTIONS' ),
array( rest_get_route_for_post_type_items( 'wp_block' ), 'OPTIONS' ),
array( rest_get_route_for_post_type_items( 'wp_template' ), 'OPTIONS' ),
sprintf( '%s/autosaves?context=edit', $rest_path ),
'/wp/v2/settings',
array( '/wp/v2/settings', 'OPTIONS' ),
'/wp/v2/global-styles/themes/' . $active_theme . '?context=view',
'/wp/v2/global-styles/themes/' . $active_theme . '/variations?context=view',
'/wp/v2/themes?context=edit&status=active',
array( '/wp/v2/global-styles/' . WP_Theme_JSON_Resolver::get_user_global_styles_post_id(), 'OPTIONS' ),
'/wp/v2/global-styles/' . WP_Theme_JSON_Resolver::get_user_global_styles_post_id() . '?context=edit',
);

block_editor_rest_api_preload( $preload_paths, $block_editor_context );

wp_add_inline_script(
'wp-blocks',
sprintf( 'wp.blocks.setCategories( %s );', wp_json_encode( get_block_categories( $post ) ) ),
'after'
);

/*
* Assign initial edits, if applicable. These are not initially assigned to the persisted post,
* but should be included in its save payload.
*/
$initial_edits = array();
$is_new_post = false;
if ( 'auto-draft' === $post->post_status ) {
$is_new_post = true;
// Override "(Auto Draft)" new post default title with empty string, or filtered value.
if ( post_type_supports( $post->post_type, 'title' ) ) {
$initial_edits['title'] = $post->post_title;
}

if ( post_type_supports( $post->post_type, 'editor' ) ) {
$initial_edits['content'] = $post->post_content;
}

if ( post_type_supports( $post->post_type, 'excerpt' ) ) {
$initial_edits['excerpt'] = $post->post_excerpt;
}
}

// Preload server-registered block schemas.
wp_add_inline_script(
'wp-blocks',
'wp.blocks.unstable__bootstrapServerSideBlockDefinitions(' . wp_json_encode( get_block_editor_server_block_settings() ) . ');'
);

// Preload server-registered block bindings sources.
$registered_sources = get_all_registered_block_bindings_sources();
if ( ! empty( $registered_sources ) ) {
$filtered_sources = array();
foreach ( $registered_sources as $source ) {
$filtered_sources[] = array(
'name' => $source->name,
'label' => $source->label,
'usesContext' => $source->uses_context,
);
}
$script = sprintf( 'for ( const source of %s ) { wp.blocks.registerBlockBindingsSource( source ); }', wp_json_encode( $filtered_sources ) );
wp_add_inline_script(
'wp-blocks',
$script
);
}

// Get admin url for handling meta boxes.
$meta_box_url = admin_url( 'post.php' );
$meta_box_url = add_query_arg(
array(
'post' => $post->ID,
'action' => 'edit',
'meta-box-loader' => true,
'meta-box-loader-nonce' => wp_create_nonce( 'meta-box-loader' ),
),
$meta_box_url
);
wp_add_inline_script(
'wp-editor',
sprintf( 'var _wpMetaBoxUrl = %s;', wp_json_encode( $meta_box_url ) ),
'before'
);

// Set Heartbeat interval to 10 seconds, used to refresh post locks.
wp_add_inline_script(
'heartbeat',
'jQuery( function() {
wp.heartbeat.interval( 10 );
} );',
'after'
);

/*
* Get all available templates for the post/page attributes meta-box.
* The "Default template" array element should only be added if the array is
* not empty so we do not trigger the template select element without any options
* besides the default value.
*/
$available_templates = wp_get_theme()->get_page_templates( get_post( $post->ID ) );
$available_templates = ! empty( $available_templates ) ? array_replace(
array(
/** This filter is documented in wp-admin/includes/meta-boxes.php */
'' => apply_filters( 'default_page_template_title', __( 'Default template' ), 'rest-api' ),
),
$available_templates
) : $available_templates;

// Lock settings.
$user_id = wp_check_post_lock( $post->ID );
if ( $user_id ) {
$locked = false;

/** This filter is documented in wp-admin/includes/post.php */
if ( apply_filters( 'show_post_locked_dialog', true, $post, $user_id ) ) {
$locked = true;
}

$user_details = null;
if ( $locked ) {
$user = get_userdata( $user_id );
$user_details = array(
'name' => $user->display_name,
);

if ( get_option( 'show_avatars' ) ) {
$user_details['avatar'] = get_avatar_url( $user_id, array( 'size' => 128 ) );
}
}

$lock_details = array(
'isLocked' => $locked,
'user' => $user_details,
);
} else {
// Lock the post.
$active_post_lock = wp_set_post_lock( $post->ID );
if ( $active_post_lock ) {
$active_post_lock = esc_attr( implode( ':', $active_post_lock ) );
}

$lock_details = array(
'isLocked' => false,
'activePostLock' => $active_post_lock,
);
}

/**
* Filters the body placeholder text.
*
* @since 5.0.0
* @since 5.8.0 Changed the default placeholder text.
*
* @param string $text Placeholder text. Default 'Type / to choose a block'.
* @param WP_Post $post Post object.
*/
$body_placeholder = apply_filters( 'write_your_story', __( 'Type / to choose a block' ), $post );

$editor_settings = array(
'availableTemplates' => $available_templates,
'disablePostFormats' => ! current_theme_supports( 'post-formats' ),
/** This filter is documented in wp-admin/edit-form-advanced.php */
'titlePlaceholder' => apply_filters( 'enter_title_here', __( 'Add title' ), $post ),
'bodyPlaceholder' => $body_placeholder,
'autosaveInterval' => AUTOSAVE_INTERVAL,
'richEditingEnabled' => user_can_richedit(),
'postLock' => $lock_details,
'postLockUtils' => array(
'nonce' => wp_create_nonce( 'lock-post_' . $post->ID ),
'unlockNonce' => wp_create_nonce( 'update-post_' . $post->ID ),
'ajaxUrl' => admin_url( 'admin-ajax.php' ),
),
'supportsLayout' => wp_theme_has_theme_json(),
'supportsTemplateMode' => current_theme_supports( 'block-templates' ),

// Whether or not to load the 'postcustom' meta box is stored as a user meta
// field so that we're not always loading its assets.
'enableCustomFields' => (bool) get_user_meta( get_current_user_id(), 'enable_custom_fields', true ),
);

// Add additional back-compat patterns registered by `current_screen` et al.
$editor_settings['__experimentalAdditionalBlockPatterns'] = WP_Block_Patterns_Registry::get_instance()->get_all_registered( true );
$editor_settings['__experimentalAdditionalBlockPatternCategories'] = WP_Block_Pattern_Categories_Registry::get_instance()->get_all_registered( true );

$autosave = wp_get_post_autosave( $post->ID );
if ( $autosave ) {
if ( mysql2date( 'U', $autosave->post_modified_gmt, false ) > mysql2date( 'U', $post->post_modified_gmt, false ) ) {
$editor_settings['autosave'] = array(
'editLink' => get_edit_post_link( $autosave->ID ),
);
} else {
wp_delete_post_revision( $autosave->ID );
}
}

if ( ! empty( $post_type_object->template ) ) {
$editor_settings['template'] = $post_type_object->template;
$editor_settings['templateLock'] = ! empty( $post_type_object->template_lock ) ? $post_type_object->template_lock : false;
}

// If there's no template set on a new post, use the post format, instead.
if ( $is_new_post && ! isset( $editor_settings['template'] ) && 'post' === $post->post_type ) {
$post_format = get_post_format( $post );
if ( in_array( $post_format, array( 'audio', 'gallery', 'image', 'quote', 'video' ), true ) ) {
$editor_settings['template'] = array( array( "core/$post_format" ) );
}
}

if ( wp_is_block_theme() && $editor_settings['supportsTemplateMode'] ) {
$editor_settings['defaultTemplatePartAreas'] = get_allowed_block_template_part_areas();
}

/**
* Scripts
*/
wp_enqueue_media(
array(
'post' => $post->ID,
)
);
wp_tinymce_inline_scripts();
wp_enqueue_editor();

/**
* Styles
*/
wp_enqueue_style( 'wp-edit-post' );

/**
* Fires after block assets have been enqueued for the editing interface.
*
* Call `add_action` on any hook before 'admin_enqueue_scripts'.
*
* In the function call you supply, simply use `wp_enqueue_script` and
* `wp_enqueue_style` to add your functionality to the block editor.
*
* @since 5.0.0
*/
do_action( 'enqueue_block_editor_assets' );

// In order to duplicate classic meta box behavior, we need to run the classic meta box actions.
require_once ABSPATH . 'wp-admin/includes/meta-boxes.php';
register_and_do_post_meta_boxes( $post );

// Check if the Custom Fields meta box has been removed at some point.
$core_meta_boxes = $wp_meta_boxes[ $current_screen->id ]['normal']['core'];
if ( ! isset( $core_meta_boxes['postcustom'] ) || ! $core_meta_boxes['postcustom'] ) {
unset( $editor_settings['enableCustomFields'] );
}

$editor_settings = get_block_editor_settings( $editor_settings, $block_editor_context );

$init_script = <<<JS
( function() {
window._wpLoadBlockEditor = new Promise( function( resolve ) {
wp.domReady( function() {
resolve( wp.editPost.initializeEditor( 'editor', "%s", %d, %s, %s ) );
} );
} );
} )();
JS;

$script = sprintf(
$init_script,
$post->post_type,
$post->ID,
wp_json_encode( $editor_settings ),
wp_json_encode( $initial_edits )
);
wp_add_inline_script( 'wp-edit-post', $script );

if ( (int) get_option( 'page_for_posts' ) === $post->ID ) {
add_action( 'admin_enqueue_scripts', '_wp_block_editor_posts_page_notice' );
}

require_once ABSPATH . 'wp-admin/admin-header.php';
?>

<div class="block-editor">
<h1 class="screen-reader-text hide-if-no-js"><?php echo esc_html( $title ); ?></h1>
<div id="editor" class="block-editor__container hide-if-no-js"></div>
<div id="metaboxes" class="hidden">
<?php the_block_editor_meta_boxes(); ?>
</div>

<?php // JavaScript is disabled. ?>
<div class="wrap hide-if-js block-editor-no-js">
<h1 class="wp-heading-inline"><?php echo esc_html( $title ); ?></h1>
<?php
if ( file_exists( WP_PLUGIN_DIR . '/classic-editor/classic-editor.php' ) ) {
// If Classic Editor is already installed, provide a link to activate the plugin.
$installed = true;
$plugin_activate_url = wp_nonce_url( 'plugins.php?action=activate&amp;plugin=classic-editor/classic-editor.php', 'activate-plugin_classic-editor/classic-editor.php' );
$message = sprintf(
/* translators: %s: Link to activate the Classic Editor plugin. */
__( 'The block editor requires JavaScript. Please enable JavaScript in your browser settings, or activate the <a href="%s">Classic Editor plugin</a>.' ),
esc_url( $plugin_activate_url )
);
} else {
// If Classic Editor is not installed, provide a link to install it.
$installed = false;
$plugin_install_url = wp_nonce_url( self_admin_url( 'update.php?action=install-plugin&plugin=classic-editor' ), 'install-plugin_classic-editor' );
$message = sprintf(
/* translators: %s: Link to install the Classic Editor plugin. */
__( 'The block editor requires JavaScript. Please enable JavaScript in your browser settings, or install the <a href="%s">Classic Editor plugin</a>.' ),
esc_url( $plugin_install_url )
);
}

/**
* Filters the message displayed in the block editor interface when JavaScript is
* not enabled in the browser.
*
* @since 5.0.3
* @since 6.4.0 Added `$installed` parameter.
*
* @param string $message The message being displayed.
* @param WP_Post $post The post being edited.
* @param bool $installed Whether the classic editor is installed.
*/
$message = apply_filters( 'block_editor_no_javascript_message', $message, $post, $installed );
wp_admin_notice(
$message,
array(
'type' => 'error',
)
);
?>
</div>
</div>