<?php
/* gamelog endpoint — POST append (client) / GET fetch (viewer) / GET action=clear
   เก็บเป็น JSONL ที่ data/log.jsonl (server.js เขียนตรง ๆ ด้วย; ไฟล์เดียวกัน) */
header('Content-Type: application/json; charset=utf-8');
$dir = __DIR__ . '/data';
$file = $dir . '/log.jsonl';
if (!is_dir($dir)) { @mkdir($dir, 0777, true); }

$method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : 'GET';

if ($method === 'POST') {
  $raw = file_get_contents('php://input');
  $j = json_decode($raw, true);
  if (!is_array($j)) { echo json_encode(['ok' => false, 'err' => 'bad json']); exit; }
  $items = (isset($j['items']) && is_array($j['items'])) ? $j['items'] : [$j];
  $lines = '';
  foreach ($items as $it) {
    if (!is_array($it)) continue;
    $rec = [
      't'      => isset($it['t']) ? (int)$it['t'] : (int)(microtime(true) * 1000),
      'cat'    => mb_substr((string)(isset($it['cat']) ? $it['cat'] : 'อื่นๆ'), 0, 24),
      'room'   => mb_substr((string)(isset($it['room']) ? $it['room'] : ''), 0, 64),
      'who'    => mb_substr((string)(isset($it['who']) ? $it['who'] : ''), 0, 48),
      'ev'     => mb_substr((string)(isset($it['ev']) ? $it['ev'] : ''), 0, 48),
      'detail' => mb_substr((string)(isset($it['detail']) ? $it['detail'] : ''), 0, 500),
      'src'    => mb_substr((string)(isset($it['src']) ? $it['src'] : 'client'), 0, 12),
    ];
    $lines .= json_encode($rec, JSON_UNESCAPED_UNICODE) . "\n";
  }
  if ($lines !== '') @file_put_contents($file, $lines, FILE_APPEND | LOCK_EX);
  /* ring trim กันไฟล์ใหญ่เกิน */
  if (@filesize($file) > 4000000) {
    $all = @file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
    if ($all && count($all) > 5000) {
      $all = array_slice($all, -5000);
      @file_put_contents($file, implode("\n", $all) . "\n", LOCK_EX);
    }
  }
  echo json_encode(['ok' => true]);
  exit;
}

if (isset($_GET['action']) && $_GET['action'] === 'clear') {
  @file_put_contents($file, '', LOCK_EX);
  echo json_encode(['ok' => true]);
  exit;
}

/* GET: คืน log (กรองตาม cat) ล่าสุดก่อน */
$cat = isset($_GET['cat']) ? $_GET['cat'] : '';
$limit = isset($_GET['limit']) ? min(3000, max(1, (int)$_GET['limit'])) : 800;
$out = [];
if (is_file($file)) {
  $all = @file($file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES);
  if ($all) {
    for ($i = count($all) - 1; $i >= 0 && count($out) < $limit; $i--) {
      $r = json_decode($all[$i], true);
      if (!is_array($r)) continue;
      if ($cat && $cat !== 'ALL' && (!isset($r['cat']) || $r['cat'] !== $cat)) continue;
      $out[] = $r;
    }
  }
}
echo json_encode(['ok' => true, 'logs' => $out, 'count' => count($out)]);