import { Command } from "commander";
import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { encodePairingSetupCode } from "../pairing/setup-code.js";

const runtime = {
  log: vi.fn(),
  error: vi.fn(),
  exit: vi.fn(() => {
    throw new Error("exit");
  }),
};

const loadConfig = vi.fn();
const runCommandWithTimeout = vi.fn();
const qrGenerate = vi.fn((_input, _opts, cb: (output: string) => void) => {
  cb("ASCII-QR");
});

vi.mock("../runtime.js", () => ({ defaultRuntime: runtime }));
vi.mock("../config/config.js", () => ({ loadConfig }));
vi.mock("../process/exec.js", () => ({ runCommandWithTimeout }));
vi.mock("qrcode-terminal", () => ({
  default: {
    generate: qrGenerate,
  },
}));

const { registerQrCli } = await import("./qr-cli.js");

function createRemoteQrConfig(params?: { withTailscale?: boolean }) {
  return {
    gateway: {
      ...(params?.withTailscale ? { tailscale: { mode: "serve" } } : {}),
      remote: { url: "wss://remote.example.com:444", token: "remote-tok" },
      auth: { mode: "token", token: "local-tok" },
    },
    plugins: {
      entries: {
        "device-pair": {
          config: {
            publicUrl: "wss://wrong.example.com:443",
          },
        },
      },
    },
  };
}

describe("registerQrCli", () => {
  function createProgram() {
    const program = new Command();
    registerQrCli(program);
    return program;
  }

  async function runQr(args: string[]) {
    const program = createProgram();
    await program.parseAsync(["qr", ...args], { from: "user" });
  }

  async function expectQrExit(args: string[]) {
    await expect(runQr(args)).rejects.toThrow("exit");
  }

  beforeEach(() => {
    vi.clearAllMocks();
    vi.stubEnv("OPENCLAW_GATEWAY_TOKEN", "");
    vi.stubEnv("CLAWDBOT_GATEWAY_TOKEN", "");
    vi.stubEnv("OPENCLAW_GATEWAY_PASSWORD", "");
    vi.stubEnv("CLAWDBOT_GATEWAY_PASSWORD", "");
  });

  afterEach(() => {
    vi.unstubAllEnvs();
  });

  it("prints setup code only when requested", async () => {
    loadConfig.mockReturnValue({
      gateway: {
        bind: "custom",
        customBindHost: "gateway.local",
        auth: { mode: "token", token: "tok" },
      },
    });

    await runQr(["--setup-code-only"]);

    const expected = encodePairingSetupCode({
      url: "ws://gateway.local:18789",
      token: "tok",
    });
    expect(runtime.log).toHaveBeenCalledWith(expected);
    expect(qrGenerate).not.toHaveBeenCalled();
  });

  it("renders ASCII QR by default", async () => {
    loadConfig.mockReturnValue({
      gateway: {
        bind: "custom",
        customBindHost: "gateway.local",
        auth: { mode: "token", token: "tok" },
      },
    });

    await runQr([]);

    expect(qrGenerate).toHaveBeenCalledTimes(1);
    const output = runtime.log.mock.calls.map((call) => String(call[0] ?? "")).join("\n");
    expect(output).toContain("Pairing QR");
    expect(output).toContain("ASCII-QR");
    expect(output).toContain("Gateway:");
    expect(output).toContain("openclaw devices approve <requestId>");
  });

  it("accepts --token override when config has no auth", async () => {
    loadConfig.mockReturnValue({
      gateway: {
        bind: "custom",
        customBindHost: "gateway.local",
      },
    });

    await runQr(["--setup-code-only", "--token", "override-token"]);

    const expected = encodePairingSetupCode({
      url: "ws://gateway.local:18789",
      token: "override-token",
    });
    expect(runtime.log).toHaveBeenCalledWith(expected);
  });

  it("exits with error when gateway config is not pairable", async () => {
    loadConfig.mockReturnValue({
      gateway: {
        bind: "loopback",
        auth: { mode: "token", token: "tok" },
      },
    });

    await expectQrExit([]);

    const output = runtime.error.mock.calls.map((call) => String(call[0] ?? "")).join("\n");
    expect(output).toContain("only bound to loopback");
  });

  it("uses gateway.remote.url when --remote is set (ignores device-pair publicUrl)", async () => {
    loadConfig.mockReturnValue(createRemoteQrConfig());
    await runQr(["--setup-code-only", "--remote"]);

    const expected = encodePairingSetupCode({
      url: "wss://remote.example.com:444",
      token: "remote-tok",
    });
    expect(runtime.log).toHaveBeenCalledWith(expected);
  });

  it.each([
    { name: "without tailscale configured", withTailscale: false },
    { name: "when tailscale is configured", withTailscale: true },
  ])("reports gateway.remote.url as source in --remote json output ($name)", async (testCase) => {
    loadConfig.mockReturnValue(createRemoteQrConfig({ withTailscale: testCase.withTailscale }));
    runCommandWithTimeout.mockResolvedValue({
      code: 0,
      stdout: '{"Self":{"DNSName":"ts-host.tailnet.ts.net."}}',
      stderr: "",
    });

    await runQr(["--json", "--remote"]);

    const payload = JSON.parse(String(runtime.log.mock.calls.at(-1)?.[0] ?? "{}")) as {
      setupCode?: string;
      gatewayUrl?: string;
      auth?: string;
      urlSource?: string;
    };
    expect(payload.gatewayUrl).toBe("wss://remote.example.com:444");
    expect(payload.auth).toBe("token");
    expect(payload.urlSource).toBe("gateway.remote.url");
    expect(runCommandWithTimeout).not.toHaveBeenCalled();
  });

  it("errors when --remote is set but no remote URL is configured", async () => {
    loadConfig.mockReturnValue({
      gateway: {
        bind: "custom",
        customBindHost: "gateway.local",
        auth: { mode: "token", token: "tok" },
      },
    });

    await expectQrExit(["--remote"]);
    const output = runtime.error.mock.calls.map((call) => String(call[0] ?? "")).join("\n");
    expect(output).toContain("qr --remote requires");
  });
});