<?php

namespace RoosterLMS\CourseBuilder;

use RoosterLMS\Admin\CategoryTreePage;
use RoosterLMS\Content\ObjectType;
use RoosterLMS\Content\PostTypes;
use RoosterLMS\Domain\Services;
use RoosterLMS\I18n\Switcher;

defined( 'ABSPATH' ) || exit;

final class EditorSwitch {

	public const HANDLE = 'rooster-lms-builder-switch';
	public const ENTRY  = 'builder-switch';

	public const NODE = 'rooster-lms-designer';

	public const BLOCK_NODE = 'rooster-lms-block-editor';

	public const TYPES = array( PostTypes::COURSE, PostTypes::LESSON, PostTypes::QUIZ );

	private static bool $registered = false;

	public static function register(): void {
		if ( self::$registered ) {
			return;
		}
		self::$registered = true;
		add_action( 'admin_bar_menu', array( self::class, 'admin_bar' ), 90 );
		if ( is_admin() ) {
			add_action( 'enqueue_block_editor_assets', array( self::class, 'enqueue' ), 30 );
			add_filter( 'post_row_actions', array( self::class, 'row_actions' ), 20, 2 );
		}
	}

	public static function available(): bool {
		return '' !== Script::register();
	}

	public static function lesson_links( int $unit_id, int $user_id ): array {
		if ( $unit_id <= 0 ) {
			return array();
		}
		$rows   = Services::curriculum_repo()->placements_of_unit( $unit_id );
		$ids    = array_values( array_unique( array_map( static fn( array $r ): int => (int) $r['item']->course_id, $rows ) ) );
		$titles = array() === $ids ? array() : Services::posts()->titles( ObjectType::COURSE, $ids, Switcher::current() );
		$out    = array();
		foreach ( $ids as $course ) {
			if ( Access::OK === Access::check( $course, $user_id ) ) {
				$out[] = array(
					'title' => (string) ( $titles[ $course ]['title'] ?? '#' . $course ),
					'url'   => add_query_arg( 'lesson', $unit_id, BuilderPage::url( $course, 'curriculum' ) ),
				);
			}
		}
		if ( array() === $out ) {
			$out[] = array(
				'title' => '',
				'url'   => add_query_arg(
					array(
						'page'   => BuilderPage::SLUG,
						'lesson' => $unit_id,
					),
					admin_url( 'admin.php' )
				),
			);
		}
		return $out;
	}

	public static function url_for_post( \WP_Post $post, int $user_id ): string {
		if ( ! self::available() || ! user_can( $user_id, 'edit_post', $post->ID ) ) {
			return '';
		}
		$url = '';
		if ( PostTypes::COURSE === $post->post_type ) {
			$course = Services::course_repo()->id_for_post( (int) $post->ID );
			$url    = $course > 0 && Access::OK === Access::check( $course, $user_id ) ? BuilderPage::url( $course ) : '';
		} elseif ( PostTypes::LESSON === $post->post_type || PostTypes::QUIZ === $post->post_type ) {
			$links = self::lesson_links( Services::unit_repo()->id_for_post( (int) $post->ID ), $user_id );
			$url   = (string) ( $links[0]['url'] ?? '' );
		}
		$lang = '' !== $url ? \RoosterLMS\I18n\Providers::current()->post_language( (int) $post->ID ) : '';
		return '' !== $lang && \RoosterLMS\I18n\Names::default_language() !== $lang ? add_query_arg( 'lang', $lang, $url ) : $url;
	}

	public static function enqueue(): void {
		$screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
		$post   = get_post();
		if ( null === $screen || 'post' !== $screen->base || ! $post instanceof \WP_Post || $post->post_type !== $screen->post_type
			|| ! in_array( $post->post_type, self::TYPES, true ) || ! current_user_can( 'edit_post', $post->ID ) || ! self::available() ) {
			return;
		}
		$dir  = CategoryTreePage::build_dir();
		$root = untrailingslashit( wp_normalize_path( ROOSTER_LMS_DIR ) );
		if ( '' === $dir || ! str_starts_with( $dir . '/', $root . '/' ) || ! is_readable( $dir . '/' . self::ENTRY . '.js' ) || ! is_readable( $dir . '/' . self::ENTRY . '.asset.php' ) ) {
			return;
		}
		$meta    = include $dir . '/' . self::ENTRY . '.asset.php';
		$meta    = is_array( $meta ) ? $meta : array();
		$version = is_string( $meta['version'] ?? null ) ? $meta['version'] : ROOSTER_LMS_VERSION;
		$url     = plugins_url( ltrim( substr( $dir, strlen( $root ) ), '/' ) . '/', ROOSTER_LMS_FILE );
		wp_enqueue_script( self::HANDLE, $url . self::ENTRY . '.js', array_values( array_filter( (array) ( $meta['dependencies'] ?? array() ), 'is_string' ) ), $version, array( 'in_footer' => true ) );
		wp_set_script_translations( self::HANDLE, 'rooster-lms', ROOSTER_LMS_DIR . 'languages' );
		foreach ( array( 'style-' . self::ENTRY, self::ENTRY ) as $css ) {
			if ( is_readable( $dir . '/' . $css . '.css' ) ) {
				wp_enqueue_style( self::HANDLE, $url . $css . '.css', array(), $version );
				wp_style_add_data( self::HANDLE, 'rtl', 'replace' );
				break;
			}
		}
		wp_add_inline_script( self::HANDLE, 'window.roosterLmsBuilderSwitch = ' . wp_json_encode( self::panel( $post, get_current_user_id() ), JSON_HEX_TAG | JSON_HEX_AMP ) . ';', 'before' );
	}

	public static function panel( \WP_Post $post, int $user_id ): array {
		if ( PostTypes::COURSE === $post->post_type ) {
			$course = Services::course_repo()->id_for_post( (int) $post->ID );
			$may    = $course > 0 && Access::OK === Access::check( $course, $user_id );
			return array(
				'kind'  => 'course',
				'links' => $may ? array(
					array(
						'title' => '',
						'url'   => BuilderPage::url( $course ),
					),
				) : array(),
				'tabs'  => $may ? array(
					'curriculum' => BuilderPage::url( $course, 'curriculum' ),
					'settings'   => BuilderPage::url( $course, 'settings' ),
					'sequencing' => BuilderPage::url( $course, 'sequencing' ),
				) : null,
			);
		}
		return array(
			'kind'  => PostTypes::QUIZ === $post->post_type ? 'quiz' : 'lesson',
			'links' => self::lesson_links( Services::unit_repo()->id_for_post( (int) $post->ID ), $user_id ),
			'tabs'  => null,
		);
	}

	public static function row_actions( $actions, $post = null ) {
		if ( ! is_array( $actions ) || ! $post instanceof \WP_Post || ! in_array( $post->post_type, self::TYPES, true ) || ! isset( $actions['edit'] ) ) {
			return $actions;
		}
		$user = get_current_user_id();
		$url  = EditorPreference::can_use_designer( $user ) ? self::url_for_post( $post, $user ) : '';
		if ( '' === $url ) {
			return $actions;
		}
		$designer = EditorPreference::DESIGNER === EditorPreference::for_user( $user );
		$out      = array();
		foreach ( $actions as $key => $html ) {
			if ( 'edit' !== $key ) {
				$out[ $key ] = $html;
				continue;
			}
			if ( ! $designer ) {
				$out['edit']          = $html;
				$out['edit_designer'] = '<a href="' . esc_url( $url ) . '">' . esc_html( EditorPreference::other_label( EditorPreference::DESIGNER ) ) . '</a>';
				continue;
			}
			/* translators: %s: post title. */
			$label             = sprintf( __( 'Edit “%s”', 'rooster-lms' ), function_exists( '_draft_or_post_title' ) ? _draft_or_post_title( $post ) : get_the_title( $post ) );
			$out['edit']       = '<a href="' . esc_url( $url ) . '" aria-label="' . esc_attr( $label ) . '">' . esc_html__( 'Edit', 'rooster-lms' ) . '</a>';
			$out['edit_block'] = '<a href="' . esc_url( EditorPreference::block_url( (int) $post->ID ) ) . '">' . esc_html( EditorPreference::other_label( EditorPreference::BLOCK ) ) . '</a>';
		}
		return $out;
	}

	public static function admin_bar( $bar ): void {
		if ( ! $bar instanceof \WP_Admin_Bar ) {
			return;
		}
		$post = null;
		if ( is_admin() ) {
			$screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
			$post   = null !== $screen && 'post' === $screen->base ? get_post() : null;
		} else {
			$post = get_queried_object();
		}
		if ( ! $post instanceof \WP_Post || ! in_array( $post->post_type, self::TYPES, true ) ) {
			return;
		}
		$user = get_current_user_id();
		$url  = EditorPreference::can_use_designer( $user ) ? self::url_for_post( $post, $user ) : '';
		if ( '' === $url ) {
			return;
		}
		$edit = is_admin() ? null : $bar->get_node( 'edit' );
		if ( null !== $edit && EditorPreference::DESIGNER === EditorPreference::for_user( $user ) ) {
			$bar->add_node(
				array(
					'id'   => 'edit',
					'href' => $url,
				)
			);
			$bar->add_node(
				array(
					'id'    => self::BLOCK_NODE,
					'title' => EditorPreference::other_label( EditorPreference::BLOCK ),
					'href'  => EditorPreference::block_url( (int) $post->ID ),
				)
			);
			return;
		}
		$bar->add_node(
			array(
				'id'    => self::NODE,
				'title' => EditorPreference::other_label( EditorPreference::DESIGNER ),
				'href'  => $url,
			)
		);
	}
}