<?php
declare(strict_types=1);

function finish(int $rows, ?string $error = null): never
{
    echo json_encode(['rows' => $rows], JSON_THROW_ON_ERROR)."\n";
    if ($error !== null) {
        fwrite(STDERR, $error."\n");
        exit(2);
    }
    exit(0);
}

$header = fgetcsv(STDIN, 0, ',', '"', '');
if ($header !== ['id', 'total_cents']) {
    finish(0, 'Invalid CSV header');
}
$rows = 0;
while (($record = fgetcsv(STDIN, 0, ',', '"', '')) !== false) {
    if (count($record) !== 2 || $record[0] === '' || !ctype_digit($record[1])) {
        finish($rows, 'Invalid CSV record');
    }
    $rows++;
}
finish($rows);