<?php
/**
 * Block editor: blocks' previews and the Stand Chat sidebar panel.
 *
 * @package StandChat
 */

namespace StandChat;

defined( 'ABSPATH' ) || exit;

/**
 * Gives the editor bundle what it needs without calling Stand: whether the
 * site is connected, who may change chat behavior, and the AI assistant's
 * name and look for static block previews.
 */
final class Editor {

	/**
	 * A post field the panel changes when it has something to save. The editor
	 * saves a page only when the page changed, and the panel's choices go to
	 * Stand after the page saves, so this makes Save available for them.
	 */
	const PENDING_FIELD = 'stand_chat_pending';

	/**
	 * Connection.
	 *
	 * @var Connection
	 */
	private $connection;

	/**
	 * Pending values sent with a save in this request, by post ID.
	 *
	 * @var array<int, string>
	 */
	private $pending = array();

	/**
	 * Constructor.
	 *
	 * @param Connection $connection Connection.
	 */
	public function __construct( Connection $connection ) {
		$this->connection = $connection;
	}

	/**
	 * Hooks.
	 */
	public function register(): void {
		add_action( 'enqueue_block_editor_assets', array( $this, 'boot' ) );
		add_action( 'rest_api_init', array( $this, 'register_pending_field' ) );
	}

	/**
	 * Registers the pending field. Nothing is stored: a save answers with the
	 * value it was sent, so the page is no longer changed afterwards.
	 */
	public function register_pending_field(): void {
		register_rest_field(
			Knowledge::post_types(),
			self::PENDING_FIELD,
			array(
				'get_callback'    => function ( $post ) {
					return $this->pending[ (int) ( $post['id'] ?? 0 ) ] ?? '';
				},
				'update_callback' => function ( $value, $post ) {
					if ( $post instanceof \WP_Post ) {
						$this->pending[ $post->ID ] = sanitize_text_field( (string) $value );
					}
					return true;
				},
				'schema'          => array(
					'description' => __( 'Changes in the Stand Chat panel waiting for the page to be saved.', 'stand-chat' ),
					'type'        => 'string',
					'maxLength'   => 40,
					'context'     => array( 'edit' ),
				),
			)
		);
	}

	/**
	 * Adds the editor bootstrap data.
	 */
	public function boot(): void {
		$preview = State::get( 'standin_preview', array() );
		$preview = is_array( $preview ) ? $preview : array();
		$data    = array(
			'restPath'   => '/' . Rest::NAMESPACE,
			'connection' => Connection::fingerprint( $this->connection->identity_seen() ),
			'connected'  => $this->connection->is_usable(),
			'siteIdSet'  => '' !== Settings::get( 'site_id' ),
			'canManage'  => current_user_can( Admin::capability() ),
			'isOwner'    => $this->connection->is_owner(),
			'postTypes'  => Knowledge::post_types(),
			'preview'    => array(
				'name'   => (string) ( $preview['displayName'] ?? '' ),
				'avatar' => (string) ( $preview['avatarUrl'] ?? '' ),
				'brand'  => (string) ( $preview['brand'] ?? wp_specialchars_decode( get_bloginfo( 'name' ), ENT_QUOTES ) ),
			),
			'urls'       => array(
				'chats'    => Service_Urls::app( '/' ),
				'sites'    => Service_Urls::app( '/sites' ),
				'standins' => admin_url( 'admin.php?page=stand-chat-standins' ),
				'widget'   => admin_url( 'admin.php?page=stand-chat-widget' ),
				'overview' => admin_url( 'admin.php?page=stand-chat' ),
			),
		);
		wp_add_inline_script( Blocks::EDITOR_HANDLE, 'window.standChatEditor = ' . wp_json_encode( $data ) . ';', 'before' );
		wp_enqueue_script( Blocks::EDITOR_HANDLE );
		// The document panel sits outside the editor iframe.
		wp_enqueue_style( Blocks::EDITOR_HANDLE );
	}
}