<?php
declare(strict_types=1);

final class DirectAdminVacationApi
{
    public function __construct(private string $directadminBinary = '/usr/local/directadmin/directadmin')
    {
    }

    /** @param array<string,mixed> $rule @return array<string,string> */
    public function buildSavePayload(string $email, array $rule): array
    {
        if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
            throw new InvalidArgumentException('Invalid mailbox email');
        }
        [$local, $domain] = explode('@', strtolower($email), 2);
        [$startDate, $startTime] = $this->splitPeriod((string)($rule['start_value'] ?? ''));
        [$endDate, $endTime] = $this->splitPeriod((string)($rule['end_value'] ?? ''));
        return [
            'action' => 'modify',
            'domain' => $domain,
            'user' => $local,
            'email' => $email,
            'text' => (string)($rule['body'] ?? ''),
            'subject' => (string)($rule['subject'] ?? ''),
            'startdate' => $startDate,
            'starttime' => $startTime,
            'enddate' => $endDate,
            'endtime' => $endTime,
        ];
    }

    /** @return array{0:string,1:string} */
    private function splitPeriod(string $value): array
    {
        if (!preg_match('/^([0-9]{4}-[0-9]{2}-[0-9]{2})\|(morning|afternoon|evening)$/', $value, $m)) {
            throw new InvalidArgumentException('DirectAdmin API backend requires directadmin_period values');
        }
        return [$m[1], $m[2]];
    }
}