<?php
require __DIR__ . '/../lib/app.php';
auth_require();

header('Content-Type: application/json');

$cfg = app_load_config();
$cap_gb        = (int)($cfg['cap_gb']        ?? 0);
$cap_reset_day = (int)($cfg['cap_reset_day'] ?? 1);
$rate_mbps     = (int)($cfg['rate_mbps']     ?? 0);

$stateDir = '/var/lib/snowpanel';
$statsFile = $stateDir . '/stats.json';
$metaFile  = $stateDir . '/meta.json';

$usage = [
  'start_ts' => null,
  'period_label' => null,
  'rx' => 0, 'tx' => 0, 'total' => 0,
  'cap_bytes' => $cap_gb > 0 ? $cap_gb * 1024*1024*1024 : 0,
  'cap_hit' => false,
];

if (is_file($metaFile)) {
  $m = json_decode((string)file_get_contents($metaFile), true);
  if (is_array($m)) {
    foreach (['start_ts','period_label','rx','tx','total','cap_bytes','cap_hit'] as $k) {
      if (array_key_exists($k, $m)) $usage[$k] = $m[$k];
    }
  }
}

$current_rate_mbps = 0.0;
if (is_file($statsFile)) {
  $s = json_decode((string)file_get_contents($statsFile), true);
  $arr = is_array($s) ? ($s['data'] ?? []) : [];
  $n = count($arr);
  if ($n >= 2) {
    $a = $arr[$n-2]; $b = $arr[$n-1];
    $dt = max(1, (int)$b['t'] - (int)$a['t']);
    $dr = max(0, (int)$b['read']    - (int)$a['read']);
    $dw = max(0, (int)$b['written'] - (int)$a['written']);
    $current_rate_mbps = (($dr + $dw) * 8.0) / $dt / 1_000_000.0;
  }
}

echo json_encode([
  'ok' => true,
  'cap_gb'        => $cap_gb,
  'cap_reset_day' => $cap_reset_day,
  'rate_mbps'     => $rate_mbps,
  'usage'         => $usage,
  'current_rate_mbps' => $current_rate_mbps
]);