<?php

namespace RoosterLMS\CourseBuilder;

use RoosterLMS\Admin\Request;

defined( 'ABSPATH' ) || exit;

final class ContentFrame {

	public const FLAG = 'rooster_lms_frame';

	public const BODY_CLASS = 'rooster-lms-frame';

	public const HANDLE = 'rooster-lms-content-frame';

	public const MESSAGE_SOURCE = 'rooster-lms-content-frame';

	public const PANELS = array( 'post-status', 'post-link', 'post-excerpt', 'featured-image', 'discussion-panel', 'page-attributes', 'template' );

	private static int $post_id = 0;

	public static function register(): void {
		add_action( 'load-post.php', array( self::class, 'load' ) );
	}

	public static function url( int $post_id ): string {
		$link = (string) get_edit_post_link( $post_id, 'raw' );
		return '' === $link ? '' : \RoosterLMS\Admin\View::url( add_query_arg( self::FLAG, '1', $link ) );
	}

	public static function load(): void {
		if ( '1' !== Request::key( self::FLAG ) || 'edit' !== Request::key( 'action' ) ) {
			return;
		}
		self::activate( Request::int( 'post' ), get_current_user_id() );
	}

	public static function activate( int $post_id, int $user_id ): bool {
		if ( ! self::allowed( $post_id, $user_id ) ) {
			return false;
		}
		self::$post_id = $post_id;
		add_filter( 'admin_body_class', array( self::class, 'body_class' ) );
		add_filter( 'filter_block_editor_meta_boxes', array( self::class, 'block_editor_meta_boxes' ), PHP_INT_MAX );
		add_action( 'add_meta_boxes', array( self::class, 'remove_meta_boxes' ), PHP_INT_MAX );
		add_action( 'enqueue_block_editor_assets', array( self::class, 'enqueue' ), 100 );
		add_filter( 'redirect_post_location', array( self::class, 'keep_flag' ) );
		return true;
	}

	public static function allowed( int $post_id, int $user_id ): bool {
		$post = $post_id > 0 ? get_post( $post_id ) : null;
		return $user_id > 0 && $post instanceof \WP_Post && in_array( $post->post_type, ContentInfo::TYPES, true ) && user_can( $user_id, 'edit_post', $post_id );
	}

	public static function active_post(): int {
		return self::$post_id;
	}

	public static function reset(): void {
		self::$post_id = 0;
		remove_filter( 'admin_body_class', array( self::class, 'body_class' ) );
		remove_filter( 'filter_block_editor_meta_boxes', array( self::class, 'block_editor_meta_boxes' ), PHP_INT_MAX );
		remove_action( 'add_meta_boxes', array( self::class, 'remove_meta_boxes' ), PHP_INT_MAX );
		remove_action( 'enqueue_block_editor_assets', array( self::class, 'enqueue' ), 100 );
		remove_filter( 'redirect_post_location', array( self::class, 'keep_flag' ) );
	}

	public static function body_class( $classes ): string {
		$post   = get_post( self::$post_id );
		$extra  = ' ' . self::BODY_CLASS;
		$extra .= null !== $post && 'publish' !== $post->post_status ? ' ' . self::BODY_CLASS . '--draft' : '';
		return (string) $classes . $extra;
	}

	public static function block_editor_meta_boxes( $boxes ) {
		$post = get_post( self::$post_id );
		if ( is_array( $boxes ) && null !== $post ) {
			unset( $boxes[ $post->post_type ] );
		}
		return $boxes;
	}

	public static function remove_meta_boxes( $post_type = '' ): void {
		global $wp_meta_boxes;
		$post_type = is_string( $post_type ) ? $post_type : '';
		if ( '' === $post_type || ! isset( $wp_meta_boxes[ $post_type ] ) || ! is_array( $wp_meta_boxes[ $post_type ] ) ) {
			return;
		}
		foreach ( $wp_meta_boxes[ $post_type ] as $context => $priorities ) {
			foreach ( (array) $priorities as $boxes ) {
				foreach ( array_keys( (array) $boxes ) as $id ) {
					if ( 'submitdiv' !== $id ) {
						remove_meta_box( (string) $id, $post_type, (string) $context );
					}
				}
			}
		}
	}

	public static function keep_flag( $location ): string {
		return add_query_arg( self::FLAG, '1', (string) $location );
	}

	public static function panels( string $post_type ): array {
		$out = self::PANELS;
		foreach ( get_object_taxonomies( $post_type ) as $taxonomy ) {
			$out[] = 'taxonomy-panel-' . $taxonomy;
		}
		return $out;
	}

	public static function enqueue(): void {
		$post = get_post( self::$post_id );
		if ( null === $post ) {
			return;
		}
		wp_enqueue_style( self::HANDLE, plugins_url( 'assets/admin/content-frame.css', ROOSTER_LMS_FILE ), array(), ROOSTER_LMS_VERSION );
		wp_enqueue_script( self::HANDLE, plugins_url( 'assets/admin/content-frame.js', ROOSTER_LMS_FILE ), array( 'wp-data', 'wp-dom-ready', 'wp-editor', 'wp-plugins', 'wp-preferences', 'wp-edit-post' ), ROOSTER_LMS_VERSION, array( 'in_footer' => true ) );
		wp_add_inline_script(
			self::HANDLE,
			'window.roosterLmsContentFrame = ' . wp_json_encode(
				array(
					'postId'  => $post->ID,
					'source'  => self::MESSAGE_SOURCE,
					'panels'  => self::panels( $post->post_type ),
					'plugins' => array( 'rooster-lms-builder-switch' ),
				),
				JSON_HEX_TAG | JSON_HEX_AMP
			) . ';',
			'before'
		);
	}
}