<?php
declare(strict_types=1);
namespace KTXM\ServiceWopi\Host;

use KTXM\ServiceWopi\Discovery\ServerAddress;

final readonly class Configuration
{
    public ServerAddress $office;
    public ServerAddress $origin;
    public int $lifetime;
    public int $maxBytes;

    public function __construct(array $settings, array $domains = [])
    {
        if (($settings['enabled'] ?? false) !== true) {
            throw new HostException('Office viewing is not configured.', 503);
        }
        try {
            $this->office = new ServerAddress($settings['office_server'] ?? '');
            $this->origin = new ServerAddress($settings['origin_server'] ?? (count(array_unique($domains)) === 1 ? 'https://' . reset($domains) : ''));
        } catch (\InvalidArgumentException|\TypeError $error) {
            throw new HostException('Office viewing requires valid HTTPS server and application URLs.', 503);
        }
        // WOPI routes are mounted under /m/service_wopi, so the origin must be a bare HTTPS origin the route path can be appended to.
        if ($this->origin->url !== $this->origin->origin) {
            throw new HostException('The WOPI origin server URL must be an HTTPS origin without a path.', 503);
        }
        $this->lifetime = max(300, min(14400, (int) ($settings['token_lifetime'] ?? 3600)));
        $this->maxBytes = max(1, min(32 * 1024 * 1024, (int) ($settings['max_bytes'] ?? 16 * 1024 * 1024)));
    }
}