const DEFAULT_PORT = 8080;
const DEFAULT_HOST = '127.0.0.1';
const DEFAULT_URL = `http://${DEFAULT_HOST}:${DEFAULT_PORT}`;

function isServiceWorker() {
  return typeof ServiceWorkerGlobalScope !== 'undefined' && self instanceof ServiceWorkerGlobalScope;
}

export async function getServerUrl() {
  if (isServiceWorker()) {
    const result = await chrome.storage.local.get('muyue_server_url');
    return result.muyue_server_url || DEFAULT_URL;
  }
  const stored = localStorage.getItem('muyue_server_url');
  return stored || DEFAULT_URL;
}

export async function setServerUrl(url) {
  if (isServiceWorker()) {
    await chrome.storage.local.set({ muyue_server_url: url });
  } else {
    localStorage.setItem('muyue_server_url', url);
  }
}

export async function buildWsUrl(token) {
  const base = await getServerUrl();
  const wsBase = base.replace(/^http/, 'ws');
  return `${wsBase}/api/ws/browser-test?token=${encodeURIComponent(token)}`;
}

export async function fetchToken() {
  const base = await getServerUrl();
  const res = await fetch(`${base}/api/test/snippet`);
  if (!res.ok) throw new Error(`Server returned ${res.status}`);
  const data = await res.json();
  return { token: data.token, wsUrl: data.ws_url, expiresIn: data.expires_in };
}

export async function fetchSessions() {
  const base = await getServerUrl();
  const res = await fetch(`${base}/api/test/sessions`);
  if (!res.ok) throw new Error(`Server returned ${res.status}`);
  const data = await res.json();
  return data.sessions || [];
}

export async function checkServerHealth() {
  try {
    const base = await getServerUrl();
    const res = await fetch(`${base}/api/info`, { signal: AbortSignal.timeout(3000) });
    return res.ok;
  } catch {
    return false;
  }
}