<?php

namespace RoosterLMS\CourseBuilder;

use RoosterLMS\Content\Course;
use RoosterLMS\Domain\Services;
use RoosterLMS\Rest\Errors;

defined( 'ABSPATH' ) || exit;

final class Access {

	public const OK = '';

	public const NOT_LOGGED_IN = 'not_logged_in';

	public const FORBIDDEN = 'forbidden';

	public const NOT_FOUND = 'not_found';

	public const PAGE_CAP = 'edit_rooster_courses';

	public static function check( int $course_id, int $user_id ): string {
		if ( $user_id <= 0 ) {
			return self::NOT_LOGGED_IN;
		}
		$course = $course_id > 0 ? Services::course_repo()->get( $course_id ) : null;
		if ( null === $course || $course->home_post_id <= 0 || null === get_post( $course->home_post_id ) ) {
			return self::NOT_FOUND;
		}
		if ( user_can( $user_id, 'edit_post', $course->home_post_id ) ) {
			return self::OK;
		}
		return Services::gate()->can_view_course( $user_id, $course_id )->allowed ? self::FORBIDDEN : self::NOT_FOUND;
	}

	public static function course( int $course_id, int $user_id ): ?Course {
		return self::OK === self::check( $course_id, $user_id ) ? Services::course_repo()->get( $course_id ) : null;
	}

	public static function rest( string $decision ) {
		switch ( $decision ) {
			case self::OK:
				return true;
			case self::NOT_LOGGED_IN:
				return Errors::not_logged_in();
			case self::FORBIDDEN:
				return Errors::forbidden();
			default:
				return Errors::not_found();
		}
	}
}