import { formatCliCommand } from "../cli/command-format.js";
import { loadConfig } from "../config/config.js";
import { resolveBrowserControlAuth } from "./control-auth.js";
import {
  createBrowserControlContext,
  startBrowserControlServiceFromConfig,
} from "./control-service.js";
import { createBrowserRouteDispatcher } from "./routes/dispatcher.js";

function isAbsoluteHttp(url: string): boolean {
  return /^https?:\/\//i.test(url.trim());
}

function isLoopbackHttpUrl(url: string): boolean {
  try {
    const host = new URL(url).hostname.trim().toLowerCase();
    return host === "127.0.0.1" || host === "localhost" || host === "::1";
  } catch {
    return false;
  }
}

function withLoopbackBrowserAuth(
  url: string,
  init: (RequestInit & { timeoutMs?: number }) | undefined,
): RequestInit & { timeoutMs?: number } {
  const headers = new Headers(init?.headers ?? {});
  if (headers.has("authorization") || headers.has("x-openclaw-password")) {
    return { ...init, headers };
  }
  if (!isLoopbackHttpUrl(url)) {
    return { ...init, headers };
  }

  try {
    const cfg = loadConfig();
    const auth = resolveBrowserControlAuth(cfg);
    if (auth.token) {
      headers.set("Authorization", `Bearer ${auth.token}`);
    } else if (auth.password) {
      headers.set("x-openclaw-password", auth.password);
    }
  } catch {
    // ignore config/auth lookup failures and continue without auth headers
  }

  return { ...init, headers };
}

function enhanceBrowserFetchError(url: string, err: unknown, timeoutMs: number): Error {
  const hint = isAbsoluteHttp(url)
    ? "If this is a sandboxed session, ensure the sandbox browser is running and try again."
    : `Start (or restart) the OpenClaw gateway (OpenClaw.app menubar, or \`${formatCliCommand("openclaw gateway")}\`) and try again.`;
  const msg = String(err);
  const msgLower = msg.toLowerCase();
  const looksLikeTimeout =
    msgLower.includes("timed out") ||
    msgLower.includes("timeout") ||
    msgLower.includes("aborted") ||
    msgLower.includes("abort") ||
    msgLower.includes("aborterror");
  if (looksLikeTimeout) {
    return new Error(
      `Can't reach the OpenClaw browser control service (timed out after ${timeoutMs}ms). ${hint}`,
    );
  }
  return new Error(`Can't reach the OpenClaw browser control service. ${hint} (${msg})`);
}

async function fetchHttpJson<T>(
  url: string,
  init: RequestInit & { timeoutMs?: number },
): Promise<T> {
  const timeoutMs = init.timeoutMs ?? 5000;
  const ctrl = new AbortController();
  const upstreamSignal = init.signal;
  let upstreamAbortListener: (() => void) | undefined;
  if (upstreamSignal) {
    if (upstreamSignal.aborted) {
      ctrl.abort(upstreamSignal.reason);
    } else {
      upstreamAbortListener = () => ctrl.abort(upstreamSignal.reason);
      upstreamSignal.addEventListener("abort", upstreamAbortListener, { once: true });
    }
  }

  const t = setTimeout(() => ctrl.abort(new Error("timed out")), timeoutMs);
  try {
    const res = await fetch(url, { ...init, signal: ctrl.signal });
    if (!res.ok) {
      const text = await res.text().catch(() => "");
      throw new Error(text || `HTTP ${res.status}`);
    }
    return (await res.json()) as T;
  } finally {
    clearTimeout(t);
    if (upstreamSignal && upstreamAbortListener) {
      upstreamSignal.removeEventListener("abort", upstreamAbortListener);
    }
  }
}

export async function fetchBrowserJson<T>(
  url: string,
  init?: RequestInit & { timeoutMs?: number },
): Promise<T> {
  const timeoutMs = init?.timeoutMs ?? 5000;
  try {
    if (isAbsoluteHttp(url)) {
      const httpInit = withLoopbackBrowserAuth(url, init);
      return await fetchHttpJson<T>(url, { ...httpInit, timeoutMs });
    }
    const started = await startBrowserControlServiceFromConfig();
    if (!started) {
      throw new Error("browser control disabled");
    }
    const dispatcher = createBrowserRouteDispatcher(createBrowserControlContext());
    const parsed = new URL(url, "http://localhost");
    const query: Record<string, unknown> = {};
    for (const [key, value] of parsed.searchParams.entries()) {
      query[key] = value;
    }
    let body = init?.body;
    if (typeof body === "string") {
      try {
        body = JSON.parse(body);
      } catch {
        // keep as string
      }
    }

    const abortCtrl = new AbortController();
    const upstreamSignal = init?.signal;
    let upstreamAbortListener: (() => void) | undefined;
    if (upstreamSignal) {
      if (upstreamSignal.aborted) {
        abortCtrl.abort(upstreamSignal.reason);
      } else {
        upstreamAbortListener = () => abortCtrl.abort(upstreamSignal.reason);
        upstreamSignal.addEventListener("abort", upstreamAbortListener, { once: true });
      }
    }

    let abortListener: (() => void) | undefined;
    const abortPromise: Promise<never> = abortCtrl.signal.aborted
      ? Promise.reject(abortCtrl.signal.reason ?? new Error("aborted"))
      : new Promise((_, reject) => {
          abortListener = () => reject(abortCtrl.signal.reason ?? new Error("aborted"));
          abortCtrl.signal.addEventListener("abort", abortListener, { once: true });
        });

    let timer: ReturnType<typeof setTimeout> | undefined;
    if (timeoutMs) {
      timer = setTimeout(() => abortCtrl.abort(new Error("timed out")), timeoutMs);
    }

    const dispatchPromise = dispatcher.dispatch({
      method:
        init?.method?.toUpperCase() === "DELETE"
          ? "DELETE"
          : init?.method?.toUpperCase() === "POST"
            ? "POST"
            : "GET",
      path: parsed.pathname,
      query,
      body,
      signal: abortCtrl.signal,
    });

    const result = await Promise.race([dispatchPromise, abortPromise]).finally(() => {
      if (timer) {
        clearTimeout(timer);
      }
      if (abortListener) {
        abortCtrl.signal.removeEventListener("abort", abortListener);
      }
      if (upstreamSignal && upstreamAbortListener) {
        upstreamSignal.removeEventListener("abort", upstreamAbortListener);
      }
    });

    if (result.status >= 400) {
      const message =
        result.body && typeof result.body === "object" && "error" in result.body
          ? String((result.body as { error?: unknown }).error)
          : `HTTP ${result.status}`;
      throw new Error(message);
    }
    return result.body as T;
  } catch (err) {
    throw enhanceBrowserFetchError(url, err, timeoutMs);
  }
}