<?php

namespace RoosterLMS\CourseBuilder\Lessons;

use RoosterLMS\Admin\TranslationLinks;
use RoosterLMS\Content\PostTypes;
use RoosterLMS\Content\Unit;
use RoosterLMS\Core\Settings;
use RoosterLMS\CourseBuilder\Boot;
use RoosterLMS\CourseBuilder\BuilderPage;
use RoosterLMS\CourseBuilder\Script;
use RoosterLMS\Domain\Services;
use RoosterLMS\I18n\Names;
use RoosterLMS\I18n\Providers;
use RoosterLMS\UI\Admin\Page;
use RoosterLMS\UI\Assets;
use RoosterLMS\UI\Kses;
use RoosterLMS\UI\Ui;

defined( 'ABSPATH' ) || exit;

final class LessonPage {

	public static function url( int $unit_id, int $course = 0 ): string {
		$args = array(
			'page'   => BuilderPage::SLUG,
			'lesson' => $unit_id,
		);
		if ( $course > 0 ) {
			$args['course'] = $course;
		}
		return add_query_arg( $args, admin_url( 'admin.php' ) );
	}

	public static function unit( int $unit_id, int $user_id ): ?Unit {
		$unit = $unit_id > 0 ? ( Services::unit_repo()->get_many( array( $unit_id ) )[ $unit_id ] ?? null ) : null;
		if ( null === $unit || (int) $unit->home_post_id <= 0 || null === get_post( (int) $unit->home_post_id ) || ! user_can( $user_id, 'edit_post', (int) $unit->home_post_id ) ) {
			return null;
		}
		return $unit;
	}

	public static function boot( Unit $unit, string $lang, int $user_id ): array {
		$lang = Boot::language( $lang );
		$list = array();
		foreach ( Names::languages() as $code ) {
			$list[] = array(
				'code' => $code,
				'name' => Names::native_name( $code ),
			);
		}
		return array(
			'api'        => Boot::API,
			'surface'    => 'admin',
			'standalone' => true,
			'userId'     => $user_id,
			'lesson'     => UnitPane::read( $unit, $lang, $user_id ),
			'lang'       => array(
				'current'    => $lang,
				'default'    => Names::default_language(),
				'translates' => count( $list ) > 1 && Providers::current()->supports_strings(),
				'languages'  => $list,
				'create'     => TranslationLinks::designer_links( (int) $unit->home_post_id ),
			),
			'time'       => array(
				'zone'        => wp_timezone_string(),
				'date_format' => \RoosterLMS\I18n\Format::date_format(),
				'time_format' => \RoosterLMS\I18n\Format::time_format(),
				'week_starts' => (int) get_option( 'start_of_week' ),
			),
			'media'      => array( 'types' => array_values( array_filter( (array) Settings::get( 'course_file_types' ), 'is_string' ) ) ),
			'links'      => array(
				'builder' => self::url( $unit->id ),
				'lessons' => \RoosterLMS\Content\UnitType::QUIZ === $unit->type ? \RoosterLMS\Admin\AdminModule::page_url( \RoosterLMS\Admin\Quizzes\QuizzesPage::SLUG ) : admin_url( 'edit.php?post_type=' . PostTypes::LESSON ),
				'list'    => \RoosterLMS\Content\UnitType::QUIZ === $unit->type ? 'quizzes' : 'lessons',
				'courses' => self::course_links( $unit, $lang ),
			),
		);
	}

	public static function course_links( Unit $unit, string $lang ): array {
		$out = array();
		foreach ( ( new \RoosterLMS\Admin\Lessons\LessonsQuery() )->placements( array( $unit->id ), $lang )[ $unit->id ] ?? array() as $placement ) {
			$course = (int) $placement['course'];
			if ( isset( $out[ $course ] ) || ! current_user_can( 'edit_post', (int) $placement['course_home'] ) ) {
				continue;
			}
			$out[ $course ] = array(
				'title' => '' !== trim( (string) $placement['course_title'] ) ? (string) $placement['course_title'] : __( '(no title)', 'rooster-lms' ),
				'url'   => add_query_arg( 'lesson', $unit->id, BuilderPage::url( $course ) ),
			);
		}
		return array_values( $out );
	}

	public static function enqueue( int $unit_id, string $lang ): void {
		$user = get_current_user_id();
		$unit = self::unit( $unit_id, $user );
		if ( null === $unit || '' === Script::register() ) {
			return;
		}
		Assets::enqueue_admin();
		Assets::enqueue_select();
		wp_enqueue_media();
		wp_enqueue_script( Script::HANDLE );
		wp_enqueue_style( Script::HANDLE );
		Script::boot( self::boot( $unit, $lang, $user ) );
	}

	public static function render( int $unit_id ): void {
		$unit = self::unit( $unit_id, get_current_user_id() );
		if ( null === $unit ) {
			Page::open(
				BuilderPage::PAGE,
				array(
					'pin'   => false,
					'board' => false,
				)
			);
			echo wp_kses(
				Ui::notice( __( 'This lesson does not exist, or you may not edit it.', 'rooster-lms' ), 'warning' ) . '<p>' . Ui::button(
					__( 'All lessons', 'rooster-lms' ),
					'outline',
					array(
						'href' => admin_url( 'edit.php?post_type=' . PostTypes::LESSON ),
						'size' => 'sm',
					)
				) . '</p>',
				Kses::admin()
			);
			Page::close();
			return;
		}
		$title = trim( wp_strip_all_tags( (string) get_the_title( (int) $unit->home_post_id ) ) );
		Page::open(
			BuilderPage::PAGE,
			array(
				'record' => '' !== $title ? $title : __( '(no title)', 'rooster-lms' ),
				'pin'    => false,
				'desc'   => '',
				'class'  => 'rooster-lms-course-builder',
				'board'  => false,
			)
		);
		$html  = '<div class="' . esc_attr( Script::MOUNT_CLASS ) . '" data-lesson="' . esc_attr( (string) $unit->id ) . '">';
		$html .= '<div class="rl-cb-skeleton" aria-hidden="true"><span class="rl-cb-skeleton__bar"></span><span class="rl-cb-skeleton__body"></span></div>';
		$html .= '<noscript><p>' . esc_html__( 'The Designer needs JavaScript.', 'rooster-lms' ) . ' <a href="' . esc_url( (string) get_edit_post_link( (int) $unit->home_post_id, 'raw' ) ) . '">' . esc_html__( 'Edit the lesson in the block editor', 'rooster-lms' ) . '</a></p></noscript>';
		$html .= '</div>';
		echo wp_kses( $html, Kses::admin() );
		Page::close();
	}
}