<?php
/**
 * Editor integration: the block editor sidebar, the classic editor meta box and the helpers that load the built
 * scripts (assets/js/<entry>.js with the dependencies listed in <entry>.asset.php).
 *
 * @package Waysill
 */

defined( 'ABSPATH' ) || exit;

/**
 * Data every Waysill script reads from `window.WAYSILL`.
 *
 * @param WP_Post|null $post The edited post, when there is one.
 * @return array<string, mixed>
 */
function waysill_script_data( $post = null ): array {
	$data = array(
		'axeUrl'        => WAYSILL_URL . 'assets/vendor/axe/axe.js',
		'settings'      => waysill_core_settings(),
		'canSeeResults' => waysill_user_can_see_results(),
		'checkOnSave'   => waysill_user_check_on_save( get_current_user_id() ),
		'settingsUrl'   => current_user_can( 'manage_options' ) ? admin_url( 'options-general.php?page=waysill' ) : '',
	);
	if ( $post instanceof WP_Post ) {
		$data['postId']         = $post->ID;
		$data['previewUrl']     = (string) get_preview_post_link( $post );
		$data['highlightNonce'] = wp_create_nonce( 'waysill_highlight_' . $post->ID );
	}
	return $data;
}

/**
 * Registers and enqueues a built script with its asset file, preceded by `window.WAYSILL`.
 *
 * @param string $entry Entry name: assets/js/<entry>.js.
 * @param array  $extra Values added to `window.WAYSILL`.
 * @return string Script handle.
 */
function waysill_enqueue_entry( string $entry, array $extra = array() ): string {
	$handle = 'waysill-' . $entry;
	$asset  = array(
		'dependencies' => array(),
		'version'      => WAYSILL_VERSION,
	);
	$file   = WAYSILL_DIR . 'assets/js/' . $entry . '.asset.php';
	if ( is_readable( $file ) ) {
		$asset = require $file;
	}
	wp_enqueue_script( $handle, WAYSILL_URL . 'assets/js/' . $entry . '.js', $asset['dependencies'], $asset['version'], true );
	wp_add_inline_script( $handle, 'window.WAYSILL = ' . wp_json_encode( array_merge( waysill_script_data( get_post() ), $extra ) ) . ';', 'before' );
	if ( in_array( 'wp-i18n', $asset['dependencies'], true ) ) {
		wp_set_script_translations( $handle, 'waysill' );
	}
	return $handle;
}

/** Styles shared by the sidebar and the meta box. */
function waysill_enqueue_editor_style(): void {
	wp_enqueue_style( 'waysill-editor', WAYSILL_URL . 'assets/css/editor.css', array(), WAYSILL_VERSION );
}

/**
 * Whether Waysill works on this post: its type has public previews and the user may edit it and see results.
 *
 * @param WP_Post|null $post Post.
 */
function waysill_editor_enabled( $post ): bool {
	return $post instanceof WP_Post
		&& is_post_type_viewable( $post->post_type )
		&& current_user_can( 'edit_post', $post->ID )
		&& waysill_user_can_see_results();
}

/** Block editor: the Accessibility sidebar. */
function waysill_enqueue_block_editor(): void {
	$screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
	// The hook also fires in the site and widget editors, which have no post preview to check.
	if ( ! $screen || 'post' !== $screen->base || ! waysill_editor_enabled( get_post() ) ) {
		return;
	}
	waysill_enqueue_entry( 'editor' );
	waysill_enqueue_editor_style();
}
add_action( 'enqueue_block_editor_assets', 'waysill_enqueue_block_editor' );

/**
 * Classic editor: the Accessibility meta box. The block editor hides it and shows the sidebar instead.
 *
 * @param string  $post_type Post type.
 * @param WP_Post $post      Post.
 */
function waysill_add_meta_box( $post_type, $post ): void {
	if ( ! waysill_editor_enabled( $post ) ) {
		return;
	}
	add_meta_box(
		'waysill',
		__( 'Accessibility', 'waysill' ),
		'waysill_render_meta_box',
		null,
		'side',
		'default',
		array( '__back_compat_meta_box' => true )
	);
}
add_action( 'add_meta_boxes', 'waysill_add_meta_box', 10, 2 );

/** Meta box body; the script renders the results into it. */
function waysill_render_meta_box(): void {
	echo '<div id="waysill-classic-root"><p>' . esc_html__( 'Loading…', 'waysill' ) . '</p></div>';
}

/**
 * Loads the meta box script on classic post edit screens.
 *
 * @param string $hook_suffix Admin page.
 */
function waysill_enqueue_classic_editor( $hook_suffix ): void {
	if ( 'post.php' !== $hook_suffix && 'post-new.php' !== $hook_suffix ) {
		return;
	}
	$post = get_post();
	if ( ! waysill_editor_enabled( $post ) || use_block_editor_for_post( $post ) ) {
		return;
	}
	waysill_enqueue_entry( 'classic' );
	waysill_enqueue_editor_style();
}
add_action( 'admin_enqueue_scripts', 'waysill_enqueue_classic_editor' );