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

header('Content-Type: application/json');
header('Cache-Control: no-store, no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');

$path = '/var/lib/torpanel/stats.json';
if (!is_readable($path)) { echo json_encode(['ok'=>true,'data'=>[]]); exit; }

$raw = file_get_contents($path);
$state = json_decode($raw, true);
if (!is_array($state) || !is_array($state['data'] ?? null)) {
  echo json_encode(['ok'=>true,'data'=>[]]); exit;
}

usort($state['data'], function($a,$b){
  return (int)($a['t'] ?? 0) <=> (int)($b['t'] ?? 0);
});

$out  = [];
$prev = null;
foreach ($state['data'] as $s) {
  $t = (int)($s['t'] ?? 0);
  if ($t <= 0) continue;

  $rx_total = (int)($s['read']    ?? ($s['bytes_read']    ?? ($s['rx'] ?? 0)));
  $tx_total = (int)($s['written'] ?? ($s['bytes_written'] ?? ($s['tx'] ?? 0)));

  $rx_mbps = 0.0; $tx_mbps = 0.0;
  if ($prev) {
    $dt = max(1, $t - $prev['t']);
    $drx = max(0, $rx_total - $prev['rx_total']);
    $dtx = max(0, $tx_total - $prev['tx_total']);
    $rx_mbps = ($drx * 8) / $dt / 1_000_000.0;
    $tx_mbps = ($dtx * 8) / $dt / 1_000_000.0;
  }

  $out[] = [
    'ts'       => $t * 1000,
    'rx_mbps'  => round($rx_mbps, 3),
    'tx_mbps'  => round($tx_mbps, 3),
    'rx_total' => $rx_total,
    'tx_total' => $tx_total,
  ];
  $prev = ['t'=>$t, 'rx_total'=>$rx_total, 'tx_total'=>$tx_total];
}

if (count($out) > 1440) $out = array_slice($out, -1440);
echo json_encode(['ok'=>true,'data'=>$out]);