<?php
declare(strict_types=1);
require __DIR__ . '/auth.php';

$BASE_DIR      = rtrim(getenv('BASE_DIR') ?: '/data', '/');
$BACKUP_SCRIPT = '/usr/local/bin/remarkable-backup.sh';
$CONVERT_SCRIPT= '/usr/local/bin/remarkable-convert.sh';
$SNAPSHOT_KEEP = getenv('SNAPSHOT_KEEP') ?: '60';

// Läuft bereits ein Sync?
$LOCK = $BASE_DIR . '/.backup.lock';

header('Content-Type: text/plain; charset=utf-8');
header('X-Accel-Buffering: no');
header('Cache-Control: no-cache');
if (ob_get_level()) ob_end_clean();

function stream(string $cmd): int {
    $handle = popen($cmd . ' 2>&1', 'r');
    if ($handle === false) return 1;
    while (!feof($handle)) {
        $chunk = fread($handle, 256);
        if ($chunk !== false && $chunk !== '') {
            echo $chunk;
            flush();
        }
    }
    return pclose($handle);
}

echo "=== Backup ===\n";
flush();
$exit = stream("SNAPSHOT_KEEP={$SNAPSHOT_KEEP} {$BACKUP_SCRIPT} {$BASE_DIR} /");

if ($exit !== 0) {
    echo "\n[FEHLER] Backup fehlgeschlagen (exit {$exit})\n";
    exit;
}

// Web-gelöschte Dateien wieder entfernen (kommen durch Sync zurück)
$excludeFile = $BASE_DIR . '/.web_deleted';
if (file_exists($excludeFile)) {
    $lines = file($excludeFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
    $removed = 0;
    foreach (array_unique($lines) as $p) {
        $p = '/' . ltrim($p, '/');
        $local = $BASE_DIR . '/current' . $p;
        if (is_dir($local)) {
            shell_exec('rm -rf ' . escapeshellarg($local));
            $removed++;
        } else {
            foreach ([$local, $local.'.pdf', $local.'.rmdoc', $local.'.thumb.jpg'] as $f) {
                if (is_file($f) && @unlink($f)) $removed++;
            }
        }
    }
    if ($removed) echo "\n[Web-Löschung] $removed Element(e) erneut entfernt.\n";
}

echo "\n=== PDF-Konvertierung ===\n";
flush();
stream("{$CONVERT_SCRIPT} {$BASE_DIR}/current");

echo "\n=== Fertig ===\n";