import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { captureEnv } from "../test-utils/env.js";
import * as tailscale from "./tailscale.js";

const {
  ensureGoInstalled,
  ensureTailscaledInstalled,
  getTailnetHostname,
  enableTailscaleServe,
  disableTailscaleServe,
  ensureFunnel,
} = tailscale;
const tailscaleBin = expect.stringMatching(/tailscale$/i);

function createRuntimeWithExitError() {
  return {
    error: vi.fn(),
    log: vi.fn(),
    exit: ((code: number) => {
      throw new Error(`exit ${code}`);
    }) as (code: number) => never,
  };
}

function expectServeFallbackCommand(params: { callArgs: string[]; sudoArgs: string[] }) {
  return [
    [tailscaleBin, expect.arrayContaining(params.callArgs)],
    ["sudo", expect.arrayContaining(["-n", tailscaleBin, ...params.sudoArgs])],
  ];
}

describe("tailscale helpers", () => {
  let envSnapshot: ReturnType<typeof captureEnv>;

  beforeEach(() => {
    envSnapshot = captureEnv(["OPENCLAW_TEST_TAILSCALE_BINARY"]);
    process.env.OPENCLAW_TEST_TAILSCALE_BINARY = "tailscale";
  });

  afterEach(() => {
    envSnapshot.restore();
    vi.restoreAllMocks();
  });

  it("parses DNS name from tailscale status", async () => {
    const exec = vi.fn().mockResolvedValue({
      stdout: JSON.stringify({
        Self: { DNSName: "host.tailnet.ts.net.", TailscaleIPs: ["100.1.1.1"] },
      }),
    });
    const host = await getTailnetHostname(exec);
    expect(host).toBe("host.tailnet.ts.net");
  });

  it("falls back to IP when DNS missing", async () => {
    const exec = vi.fn().mockResolvedValue({
      stdout: JSON.stringify({ Self: { TailscaleIPs: ["100.2.2.2"] } }),
    });
    const host = await getTailnetHostname(exec);
    expect(host).toBe("100.2.2.2");
  });

  it("parses noisy JSON output from tailscale status", async () => {
    const exec = vi.fn().mockResolvedValue({
      stdout:
        'warning: stale state\n{"Self":{"DNSName":"noisy.tailnet.ts.net.","TailscaleIPs":["100.9.9.9"]}}\n',
    });
    const host = await getTailnetHostname(exec);
    expect(host).toBe("noisy.tailnet.ts.net");
  });

  it.each([
    {
      name: "ensureGoInstalled installs when missing and user agrees",
      fn: ensureGoInstalled,
      missingError: new Error("no go"),
      installCommand: ["brew", ["install", "go"]] as const,
      promptResult: true,
    },
    {
      name: "ensureTailscaledInstalled installs when missing and user agrees",
      fn: ensureTailscaledInstalled,
      missingError: new Error("missing"),
      installCommand: ["brew", ["install", "tailscale"]] as const,
      promptResult: true,
    },
  ])("$name", async ({ fn, missingError, installCommand, promptResult }) => {
    const exec = vi.fn().mockRejectedValueOnce(missingError).mockResolvedValue({});
    const prompt = vi.fn().mockResolvedValue(promptResult);
    const runtime = createRuntimeWithExitError();
    await fn(exec as never, prompt, runtime);
    expect(exec).toHaveBeenCalledWith(installCommand[0], installCommand[1]);
  });

  it.each([
    {
      name: "ensureGoInstalled exits when missing and user declines install",
      fn: ensureGoInstalled,
      missingError: new Error("no go"),
      errorMessage: "Go is required to build tailscaled from source. Aborting.",
    },
    {
      name: "ensureTailscaledInstalled exits when missing and user declines install",
      fn: ensureTailscaledInstalled,
      missingError: new Error("missing"),
      errorMessage: "tailscaled is required for user-space funnel. Aborting.",
    },
  ])("$name", async ({ fn, missingError, errorMessage }) => {
    const exec = vi.fn().mockRejectedValueOnce(missingError);
    const prompt = vi.fn().mockResolvedValue(false);
    const runtime = createRuntimeWithExitError();

    await expect(fn(exec as never, prompt, runtime)).rejects.toThrow("exit 1");
    expect(runtime.error).toHaveBeenCalledWith(errorMessage);
    expect(exec).toHaveBeenCalledTimes(1);
  });

  it("enableTailscaleServe attempts normal first, then sudo", async () => {
    const exec = vi
      .fn()
      .mockRejectedValueOnce(new Error("permission denied"))
      .mockResolvedValueOnce({ stdout: "" });

    await enableTailscaleServe(3000, exec as never);

    const [firstCall, secondCall] = expectServeFallbackCommand({
      callArgs: ["serve", "--bg", "--yes", "3000"],
      sudoArgs: ["serve", "--bg", "--yes", "3000"],
    });
    expect(exec).toHaveBeenNthCalledWith(1, firstCall[0], firstCall[1], expect.any(Object));
    expect(exec).toHaveBeenNthCalledWith(2, secondCall[0], secondCall[1], expect.any(Object));
  });

  it("enableTailscaleServe does NOT use sudo if first attempt succeeds", async () => {
    const exec = vi.fn().mockResolvedValue({ stdout: "" });

    await enableTailscaleServe(3000, exec as never);

    expect(exec).toHaveBeenCalledTimes(1);
    expect(exec).toHaveBeenCalledWith(
      tailscaleBin,
      expect.arrayContaining(["serve", "--bg", "--yes", "3000"]),
      expect.any(Object),
    );
  });

  it("disableTailscaleServe uses fallback", async () => {
    const exec = vi
      .fn()
      .mockRejectedValueOnce(new Error("permission denied"))
      .mockResolvedValueOnce({ stdout: "" });

    await disableTailscaleServe(exec as never);

    expect(exec).toHaveBeenCalledTimes(2);
    expect(exec).toHaveBeenNthCalledWith(
      2,
      "sudo",
      expect.arrayContaining(["-n", tailscaleBin, "serve", "reset"]),
      expect.any(Object),
    );
  });

  it("ensureFunnel uses fallback for enabling", async () => {
    const exec = vi
      .fn()
      .mockResolvedValueOnce({ stdout: JSON.stringify({ BackendState: "Running" }) }) // status
      .mockRejectedValueOnce(new Error("permission denied")) // enable normal
      .mockResolvedValueOnce({ stdout: "" }); // enable sudo

    const runtime = {
      error: vi.fn(),
      log: vi.fn(),
      exit: vi.fn() as unknown as (code: number) => never,
    };
    const prompt = vi.fn();

    await ensureFunnel(8080, exec as never, runtime, prompt);

    expect(exec).toHaveBeenNthCalledWith(
      1,
      tailscaleBin,
      expect.arrayContaining(["funnel", "status", "--json"]),
    );
    expect(exec).toHaveBeenNthCalledWith(
      2,
      tailscaleBin,
      expect.arrayContaining(["funnel", "--yes", "--bg", "8080"]),
      expect.any(Object),
    );
    expect(exec).toHaveBeenNthCalledWith(
      3,
      "sudo",
      expect.arrayContaining(["-n", tailscaleBin, "funnel", "--yes", "--bg", "8080"]),
      expect.any(Object),
    );
  });

  it("enableTailscaleServe skips sudo on non-permission errors", async () => {
    const exec = vi.fn().mockRejectedValueOnce(new Error("boom"));

    await expect(enableTailscaleServe(3000, exec as never)).rejects.toThrow("boom");

    expect(exec).toHaveBeenCalledTimes(1);
  });

  it("enableTailscaleServe rethrows original error if sudo fails", async () => {
    const originalError = Object.assign(new Error("permission denied"), {
      stderr: "permission denied",
    });
    const exec = vi
      .fn()
      .mockRejectedValueOnce(originalError)
      .mockRejectedValueOnce(new Error("sudo: a password is required"));

    await expect(enableTailscaleServe(3000, exec as never)).rejects.toBe(originalError);

    expect(exec).toHaveBeenCalledTimes(2);
  });
});