<?php

declare(strict_types=1);

namespace FecaMailshots\Infrastructure;

use FecaMailshots\Application\ImapAppender;

final class PhpImapAppender implements ImapAppender
{
    /** @var array<string, bool> */
    private array $attemptCache = [];

    public function appendSent(array $credentials, string $rawMime, string $attemptId): void
    {
        if (isset($this->attemptCache[$attemptId])) {
            return;
        }

        $host = (string) ($credentials['imap_host'] ?? '');
        $port = (int) ($credentials['imap_port'] ?? 993);
        $user = (string) ($credentials['imap_user'] ?? '');
        $pass = (string) ($credentials['imap_password'] ?? '');
        $folder = (string) ($credentials['imap_sent_folder'] ?? 'Sent');
        $flags = (string) ($credentials['imap_mailbox_flags'] ?? '/imap/ssl');

        if ($host === '' || $user === '' || $pass === '') {
            throw new \RuntimeException('IMAP credentials are missing.');
        }

        if (!function_exists('imap_open') || !function_exists('imap_append')) {
            throw new \RuntimeException('IMAP extension is not available in PHP runtime.');
        }

        $mailbox = sprintf('{%s:%d%s}%s', $host, $port, $flags, $folder);
        $imap = @imap_open($mailbox, $user, $pass);
        if ($imap === false) {
            throw new \RuntimeException('Failed to open IMAP mailbox: ' . (imap_last_error() ?: 'unknown error'));
        }

        try {
            if (!@imap_append($imap, $mailbox, $rawMime . "\r\n", "\\Seen")) {
                throw new \RuntimeException('Failed to append to IMAP Sent folder: ' . (imap_last_error() ?: 'unknown error'));
            }
            $this->attemptCache[$attemptId] = true;
        } finally {
            imap_close($imap);
        }
    }
}