/**
 * 将 HTTP API 根地址转为 WebSocket 根（用于 /android/scrcpy/ws）。
 * next dev 下若未设置 NEXT_PUBLIC_API_URL，浏览器会连到 :3000，WebSocket 升级通常无法被中间件代理；
 * 真流调试请设 NEXT_PUBLIC_API_URL 指向 uvicorn（例如 http://127.0.0.1:8001）。
 */

export function httpApiBaseToWsBase(apiBase: string): string {
  if (typeof window === "undefined") return "ws://127.0.0.1:8001";
  const base = (apiBase || "").trim();
  if (base) {
    try {
      const u = new URL(base, window.location.href);
      const proto = u.protocol === "https:" ? "wss:" : "ws:";
      return `${proto}//${u.host}`;
    } catch {
      /* ignore */
    }
  }
  const { protocol, host } = window.location;
  const proto = protocol === "https:" ? "wss:" : "ws:";
  return `${proto}//${host}`;
}

export function androidScrcpyWsUrl(apiBase: string, serial: string, maxSize = 1920): string {
  const root = httpApiBaseToWsBase(apiBase).replace(/\/$/, "");
  const q = new URLSearchParams({ serial, max_size: String(maxSize) });
  return `${root}/android/scrcpy/ws?${q.toString()}`;
}