<?php

namespace RoosterLMS\Learn;

use RoosterLMS\Blocks\Learner;
use RoosterLMS\Domain\Services;
use RoosterLMS\I18n\Format;
use RoosterLMS\Media\Media;
use RoosterLMS\Media\MediaKind;
use RoosterLMS\Media\MediaOwner;
use RoosterLMS\Media\MediaProgressService;
use RoosterLMS\Media\MediaRole;
use RoosterLMS\Media\MediaSettings;
use RoosterLMS\Progress\ProgressStatus;

defined( 'ABSPATH' ) || exit;

final class CompletionGuard {

	public static function why( int $user_id, int $item_id ): string {
		if ( $user_id <= 0 || ! MediaSettings::required_in_use() || ! MediaSettings::block_manual() ) {
			return '';
		}
		return self::reason( $user_id, $item_id );
	}

	public static function reason( int $user_id, int $item_id ): string {
		$item = $item_id > 0 ? ( Services::curriculum_repo()->items( array( $item_id ) )[ $item_id ] ?? null ) : null;
		if ( null === $item ) {
			return '';
		}
		$media = Services::media_repo()->for_owner( MediaOwner::UNIT, $item->unit_id, MediaRole::PRIMARY );
		if ( null === $media || ! $media->completes() || ! MediaProgressService::trackable( $media ) || null === Services::media_progress()->measure( $media ) ) {
			return '';
		}
		if ( ProgressStatus::COMPLETED === ( Learner::item_statuses( $user_id, $item->course_id )[ $item->id ] ?? ProgressStatus::NOT_STARTED ) ) {
			return '';
		}
		$e     = Learner::enrolment( $user_id, $item->course_id );
		$cycle = max( 1, (int) ( $e?->cycle ?? 1 ) );
		if ( MediaProgressService::max_percent( $user_id, $item->id, $cycle ) >= (int) $media->required_percent ) {
			return '';
		}
		return self::message( $media );
	}

	public static function message( Media $media ): string {
		$p = Format::percent( (int) $media->required_percent );
		if ( MediaKind::PDF === $media->kind ) {
			return 100 <= (int) $media->required_percent
				? __( 'Open every page of the document to complete this lesson.', 'rooster-lms' )
				/* translators: %s: a percentage. */
				: sprintf( __( 'Read at least %s of the pages to complete this lesson.', 'rooster-lms' ), $p );
		}
		return MediaKind::AUDIO === $media->kind
			/* translators: %s: a percentage. */
			? sprintf( __( 'Listen to at least %s of the audio to complete this lesson.', 'rooster-lms' ), $p )
			/* translators: %s: a percentage. */
			: sprintf( __( 'Watch at least %s of the video to complete this lesson.', 'rooster-lms' ), $p );
	}
}