<?php
require __DIR__ . '/../../lib/app.php';
auth_require();
header('Content-Type: application/json');

$stateDir  = '/var/lib/snowpanel';
$perFile   = $stateDir . '/period.json';
$lockFile  = $stateDir . '/cap.lock';

$cfg = app_load_config();
$cap_day = (int)($cfg['cap_day'] ?? 1);
$cap_day = max(1, min(28, $cap_day));

$tz = new DateTimeZone(@date_default_timezone_get() ?: 'UTC');
$now = new DateTime('now', $tz);
$y = (int)$now->format('Y');
$m = (int)$now->format('n');
$d = (int)$now->format('j');

if ($d < $cap_day) {
  if ($m === 1) { $m = 12; $y -= 1; } else { $m -= 1; }
}
$anchor = (new DateTime(sprintf('%04d-%02d-%02d 00:00:00', $y, $m, $cap_day), $tz))->getTimestamp();

$period = [
  'period_start' => $anchor,
  'rx' => 0,
  'tx' => 0,
  'last_ing' => 0,
  'last_egr' => 0,
];

@file_put_contents($perFile, json_encode($period, JSON_UNESCAPED_SLASHES));
@unlink($lockFile);

echo json_encode(['ok' => true]);