/**
 * 将 HTTP API 根地址转为 WebSocket 根（用于 /android/scrcpy/ws）。
 * next dev：HTTP 可走 middleware rewrite，但 WebSocket 升级通常不会转发，故在常见 dev 端口直连 uvicorn（与 middleware API_PROXY_TARGET 默认一致）。
 */

const DEFAULT_DEV_API_PORT = "8001";

export function httpApiBaseToWsBase(apiBase: string): string {
  if (typeof window === "undefined") return `ws://127.0.0.1:${DEFAULT_DEV_API_PORT}`;
  const base = (apiBase || "").trim();
  if (base) {
    try {
      const u = new URL(base, window.location.href);
      const proto = u.protocol === "https:" ? "wss:" : "ws:";
      return `${proto}//${u.host}`;
    } catch {
      /* ignore */
    }
  }
  const pub =
    typeof process !== "undefined" && process.env.NEXT_PUBLIC_API_URL
      ? String(process.env.NEXT_PUBLIC_API_URL).trim()
      : "";
  if (pub) {
    try {
      const u = new URL(pub, window.location.href);
      const proto = u.protocol === "https:" ? "wss:" : "ws:";
      return `${proto}//${u.host}`;
    } catch {
      /* ignore */
    }
  }
  const port = window.location.port;
  if (port === "3000" || port === "3001") {
    const h = window.location.hostname || "127.0.0.1";
    return `ws://${h}:${DEFAULT_DEV_API_PORT}`;
  }
  const { protocol, host } = window.location;
  const proto = protocol === "https:" ? "wss:" : "ws:";
  return `${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()}`;
}