<?php

declare(strict_types=1);

namespace Blax\WebRtc\Rooms\Stores;

use Blax\WebRtc\Contracts\RoomStore;

/**
 * In-process room store: membership + presence in PHP arrays. Right for the
 * long-lived bundled server where one process owns every connection. A
 * fork-per-message host binds a Cache-backed store instead (see {@see RoomStore}).
 */
final class ArrayRoomStore implements RoomStore
{
    /** @var array<string,array<string,array<string,mixed>>> roomId => (peerId => presence info), insertion-ordered */
    private array $rooms = [];

    /** @var array<string,string> peerId => roomId */
    private array $peerRoom = [];

    public function members(string $roomId): array
    {
        return array_keys($this->rooms[$roomId] ?? []);
    }

    public function info(string $roomId, string $peerId): array
    {
        return $this->rooms[$roomId][$peerId] ?? [];
    }

    public function roomOf(string $peerId): ?string
    {
        return $this->peerRoom[$peerId] ?? null;
    }

    public function add(string $roomId, string $peerId, array $info): void
    {
        $this->rooms[$roomId][$peerId] = $info;
        $this->peerRoom[$peerId] = $roomId;
    }

    public function remove(string $roomId, string $peerId): void
    {
        unset($this->rooms[$roomId][$peerId], $this->peerRoom[$peerId]);

        if (($this->rooms[$roomId] ?? []) === []) {
            unset($this->rooms[$roomId]);
        }
    }

    public function roomIds(): array
    {
        return array_keys($this->rooms);
    }
}