<?php

namespace RoosterLMS\Invitations;

defined( 'ABSPATH' ) || exit;

final class Invitation {

	public function __construct(
		public readonly int $id,
		public readonly InvitationKind $kind,
		public readonly int $course_id,
		public readonly int $unit_id,
		public readonly int $occurrence_id,
		public readonly int $template_id,
		public readonly int $announcement_id,
		public readonly int $version,
		public readonly array $attachment_ids,
		public readonly int $rsvp,
		public readonly string $rsvp_until,
		public readonly YesAction $yes_action,
		public readonly int $places,
		public readonly InvitationState $state,
		public readonly string $scheduled_at,
		public readonly string $sent_at,
		public readonly string $subject,
		public readonly string $body,
		public readonly string $lang,
		public readonly int $created_by,
		public readonly string $created_at,
		public readonly int $target_cohort_id = 0
	) {}

	public static function from_row( array $row ): self {
		$ids = json_decode( (string) ( $row['attachment_ids'] ?? '' ), true );
		$ids = is_array( $ids ) ? array_values( array_filter( array_map( 'intval', $ids ), static fn( int $id ): bool => $id > 0 ) ) : array();
		return new self(
			(int) $row['id'],
			InvitationKind::tryFrom( (int) $row['kind'] ) ?? InvitationKind::RSVP,
			(int) $row['course_id'],
			(int) $row['unit_id'],
			(int) $row['occurrence_id'],
			(int) $row['template_id'],
			(int) ( $row['announcement_id'] ?? 0 ),
			max( 1, (int) $row['version'] ),
			$ids,
			(int) $row['rsvp'],
			(string) ( $row['rsvp_until'] ?? '' ),
			YesAction::tryFrom( (int) $row['yes_action'] ) ?? YesAction::NONE,
			(int) $row['places'],
			InvitationState::tryFrom( (int) $row['state'] ) ?? InvitationState::DRAFT,
			(string) ( $row['scheduled_at'] ?? '' ),
			(string) ( $row['sent_at'] ?? '' ),
			(string) ( $row['subject'] ?? '' ),
			(string) ( $row['body'] ?? '' ),
			(string) ( $row['lang'] ?? '' ),
			(int) $row['created_by'],
			(string) $row['created_at'],
			(int) ( $row['target_cohort_id'] ?? 0 )
		);
	}

	public function is_cohort_only(): bool {
		return $this->course_id <= 0 && $this->target_cohort_id > 0;
	}

	public function asks(): bool {
		return InvitationKind::RSVP === $this->kind && array() !== RsvpAnswer::offered( $this->rsvp );
	}

	public function is_cancelled(): bool {
		return InvitationState::CANCELLED === $this->state;
	}

	public function to_array(): array {
		return array(
			'id'               => $this->id,
			'kind'             => match ( $this->kind ) {
				InvitationKind::RSVP => 'rsvp',
				InvitationKind::INTEREST => 'interest',
				default => 'announcement',
			},
			'course_id'        => $this->course_id,
			'unit_id'          => $this->unit_id,
			'occurrence_id'    => $this->occurrence_id,
			'template_id'      => $this->template_id,
			'announcement_id'  => $this->announcement_id,
			'version'          => $this->version,
			'attachment_ids'   => $this->attachment_ids,
			'rsvp'             => array_map( static fn( RsvpAnswer $a ): string => $a->slug(), RsvpAnswer::offered( $this->rsvp ) ),
			'rsvp_until'       => $this->rsvp_until,
			'yes_action'       => match ( $this->yes_action ) {
				YesAction::REGISTER => 'register',
				YesAction::ENROL => 'enrol',
				YesAction::JOIN_COHORT => 'join_cohort',
				default => 'none',
			},
			'target_cohort_id' => $this->target_cohort_id,
			'places'           => $this->places,
			'state'            => $this->state->slug(),
			'scheduled_at'     => $this->scheduled_at,
			'sent_at'          => $this->sent_at,
			'subject'          => $this->subject,
			'body'             => $this->body,
			'created_by'       => $this->created_by,
			'created_at'       => $this->created_at,
		);
	}
}