<?php
/**
 * Bootstrapping the Gutenberg widgets page.
 *
 * @package gutenberg
 */

/**
 * The main entry point for the Gutenberg widgets page.
 *
 * @since 5.2.0
 */
function the_gutenberg_widgets() {
	?>
	<div
		id="widgets-editor"
		class="blocks-widgets-container"
	>
	</div>
	<?php
}

/**
 * Creates an array of theme styles to load into the block editor.
 *
 * @since 5.8.0
 *
 * @global array $editor_styles
 *
 * @return array
 */
function gutenberg_get_block_editor_theme_styles() {
	global $editor_styles;

	$styles = array(
		array(
			'css'            => 'body { font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Oxygen-Sans,Ubuntu,Cantarell,"Helvetica Neue",sans-serif }',
			'__unstableType' => 'core',
		),
	);
	if ( $editor_styles && current_theme_supports( 'editor-styles' ) ) {
		foreach ( $editor_styles as $style ) {
			if ( preg_match( '~^(https?:)?//~', $style ) ) {
				$response = wp_remote_get( $style );
				if ( ! is_wp_error( $response ) ) {
					$styles[] = array(
						'css'            => wp_remote_retrieve_body( $response ),
						'__unstableType' => 'theme',
					);
				}
			} else {
				$file = get_theme_file_path( $style );
				if ( is_file( $file ) ) {
					$styles[] = array(
						'css'            => file_get_contents( $file ),
						'baseURL'        => get_theme_file_uri( $style ),
						'__unstableType' => 'theme',
					);
				}
			}
		}
	}

	return $styles;
}

/**
 * Initialize the Gutenberg widgets page.
 *
 * @since 5.2.0
 *
 * @param string $hook Page.
 */
function gutenberg_widgets_init( $hook ) {
	if ( ! in_array( $hook, array( 'appearance_page_gutenberg-widgets' ), true ) ) {
		return;
	}

	add_filter( 'admin_body_class', 'gutenberg_widgets_editor_add_admin_body_classes' );

	$widgets_editor_context = new WP_Block_Editor_Context();
	$settings               = array_merge(
		gutenberg_get_default_block_editor_settings(),
		gutenberg_get_legacy_widget_settings(),
		array( 'styles' => gutenberg_get_block_editor_theme_styles() )
	);

	// This purposefully does not rely on apply_filters( 'block_editor_settings', $settings, null );
	// Applying that filter would bring over multitude of features from the post editor, some of which
	// may be undesirable. Instead of using that filter, we simply pick just the settings that are needed.
	$settings = gutenberg_experimental_global_styles_settings( $settings );
	$settings = gutenberg_extend_block_editor_styles( $settings );

	gutenberg_initialize_editor(
		'widgets_editor',
		'edit-widgets',
		array(
			'preload_paths'   => array(
				array( '/wp/v2/media', 'OPTIONS' ),
				'/wp/v2/sidebars?context=edit&per_page=-1',
				'/wp/v2/widgets?context=edit&per_page=-1&_embed=about',
			),
			'editor_settings' => $settings,
		)
	);

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

	wp_enqueue_script( 'wp-edit-widgets' );
	wp_enqueue_script( 'admin-widgets' );
	wp_enqueue_script( 'wp-format-library' );
	wp_enqueue_style( 'wp-edit-widgets' );
	wp_enqueue_style( 'wp-format-library' );
	do_action( 'enqueue_block_editor_assets' );
}
add_action( 'admin_enqueue_scripts', 'gutenberg_widgets_init' );

/**
 * Tells the script loader to load the scripts and styles of custom block on widgets editor screen.
 *
 * @param bool $is_block_editor_screen Current decision about loading block assets.
 * @return bool Filtered decision about loading block assets.
 */
function gutenberg_widgets_editor_load_block_editor_scripts_and_styles( $is_block_editor_screen ) {
	if ( is_callable( 'get_current_screen' ) && get_current_screen() && 'appearance_page_gutenberg-widgets' === get_current_screen()->base ) {
		return true;
	}

	return $is_block_editor_screen;
}

add_filter( 'should_load_block_editor_scripts_and_styles', 'gutenberg_widgets_editor_load_block_editor_scripts_and_styles' );

/**
 * Adds admin classes necessary for the block-based widgets screen.
 *
 * - Adds `block-editor-page` editor body class to allow directly styling the admin pages that are based on the block editor.
 * - Shows responsive embeds correctly on the widgets screen by adding the `wp-embed-responsive` class.
 *
 * @param string $classes existing admin body classes.
 *
 * @return string admin body classes including the `block-editor-page` and `wp-embed-responsive` classes.
 */
function gutenberg_widgets_editor_add_admin_body_classes( $classes ) {
	return "$classes block-editor-page wp-embed-responsive";
}

/**
 * Emulates the Widgets screen `admin_print_styles` when at the block editor
 * screen.
 */
function gutenberg_block_editor_admin_print_styles() {
	if ( is_callable( 'get_current_screen' ) && 'appearance_page_gutenberg-widgets' === get_current_screen()->base ) {
		/** This action is documented in wp-admin/admin-footer.php */
		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
		do_action( 'admin_print_styles-widgets.php' );
	}
}
add_action( 'admin_print_styles', 'gutenberg_block_editor_admin_print_styles' );

/**
 * Emulates the Widgets screen `admin_print_scripts` when at the block editor
 * screen.
 */
function gutenberg_block_editor_admin_print_scripts() {
	if ( is_callable( 'get_current_screen' ) && 'appearance_page_gutenberg-widgets' === get_current_screen()->base ) {
		/** This action is documented in wp-admin/includes/ajax-actions.php */
		do_action( 'load-widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
		/** This action is documented in wp-admin/includes/ajax-actions.php */
		do_action( 'widgets.php' ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
		/** This action is documented in wp-admin/widgets.php */
		do_action( 'sidebar_admin_setup' );
		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
		do_action( 'admin_print_scripts-widgets.php' );
	}
}
add_action( 'admin_print_scripts', 'gutenberg_block_editor_admin_print_scripts' );

/**
 * Emulates the Widgets screen `admin_print_footer_scripts` when at the block
 * editor screen.
 */
function gutenberg_block_editor_admin_print_footer_scripts() {
	if ( is_callable( 'get_current_screen' ) && 'appearance_page_gutenberg-widgets' === get_current_screen()->base ) {
		/** This action is documented in wp-admin/admin-footer.php */
		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
		do_action( 'admin_print_footer_scripts-widgets.php' );
	}
}
add_action( 'admin_print_footer_scripts', 'gutenberg_block_editor_admin_print_footer_scripts' );

/**
 * Emulates the Widgets screen `admin_footer` when at the block editor screen.
 */
function gutenberg_block_editor_admin_footer() {
	if ( is_callable( 'get_current_screen' ) && 'appearance_page_gutenberg-widgets' === get_current_screen()->base ) {
		/** This action is documented in wp-admin/admin-footer.php */
		// phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
		do_action( 'admin_footer-widgets.php' );
	}
}
add_action( 'admin_footer', 'gutenberg_block_editor_admin_footer' );