import { type AddressInfo, createServer } from "node:net";
import { fetch as realFetch } from "undici";

import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";

let testPort = 0;
let cdpBaseUrl = "";
let reachable = false;
let cfgAttachOnly = false;
let createTargetId: string | null = null;

const cdpMocks = vi.hoisted(() => ({
  createTargetViaCdp: vi.fn(async () => {
    throw new Error("cdp disabled");
  }),
  snapshotAria: vi.fn(async () => ({
    nodes: [{ ref: "1", role: "link", name: "x", depth: 0 }],
  })),
}));

const pwMocks = vi.hoisted(() => ({
  armDialogViaPlaywright: vi.fn(async () => {}),
  armFileUploadViaPlaywright: vi.fn(async () => {}),
  clickViaPlaywright: vi.fn(async () => {}),
  closePageViaPlaywright: vi.fn(async () => {}),
  closePlaywrightBrowserConnection: vi.fn(async () => {}),
  downloadViaPlaywright: vi.fn(async () => ({
    url: "https://example.com/report.pdf",
    suggestedFilename: "report.pdf",
    path: "/tmp/report.pdf",
  })),
  dragViaPlaywright: vi.fn(async () => {}),
  evaluateViaPlaywright: vi.fn(async () => "ok"),
  fillFormViaPlaywright: vi.fn(async () => {}),
  getConsoleMessagesViaPlaywright: vi.fn(async () => []),
  hoverViaPlaywright: vi.fn(async () => {}),
  scrollIntoViewViaPlaywright: vi.fn(async () => {}),
  navigateViaPlaywright: vi.fn(async () => ({ url: "https://example.com" })),
  pdfViaPlaywright: vi.fn(async () => ({ buffer: Buffer.from("pdf") })),
  pressKeyViaPlaywright: vi.fn(async () => {}),
  responseBodyViaPlaywright: vi.fn(async () => ({
    url: "https://example.com/api/data",
    status: 200,
    headers: { "content-type": "application/json" },
    body: '{"ok":true}',
  })),
  resizeViewportViaPlaywright: vi.fn(async () => {}),
  selectOptionViaPlaywright: vi.fn(async () => {}),
  setInputFilesViaPlaywright: vi.fn(async () => {}),
  snapshotAiViaPlaywright: vi.fn(async () => ({ snapshot: "ok" })),
  takeScreenshotViaPlaywright: vi.fn(async () => ({
    buffer: Buffer.from("png"),
  })),
  typeViaPlaywright: vi.fn(async () => {}),
  waitForDownloadViaPlaywright: vi.fn(async () => ({
    url: "https://example.com/report.pdf",
    suggestedFilename: "report.pdf",
    path: "/tmp/report.pdf",
  })),
  waitForViaPlaywright: vi.fn(async () => {}),
}));

function makeProc(pid = 123) {
  const handlers = new Map<string, Array<(...args: unknown[]) => void>>();
  return {
    pid,
    killed: false,
    exitCode: null as number | null,
    on: (event: string, cb: (...args: unknown[]) => void) => {
      handlers.set(event, [...(handlers.get(event) ?? []), cb]);
      return undefined;
    },
    emitExit: () => {
      for (const cb of handlers.get("exit") ?? []) cb(0);
    },
    kill: () => {
      return true;
    },
  };
}

const proc = makeProc();

vi.mock("../config/config.js", async (importOriginal) => {
  const actual = await importOriginal<typeof import("../config/config.js")>();
  return {
    ...actual,
    loadConfig: () => ({
      browser: {
        enabled: true,
        controlUrl: `http://127.0.0.1:${testPort}`,
        color: "#FF4500",
        attachOnly: cfgAttachOnly,
        headless: true,
        defaultProfile: "clawd",
        profiles: {
          clawd: { cdpPort: testPort + 1, color: "#FF4500" },
        },
      },
    }),
    writeConfigFile: vi.fn(async () => {}),
  };
});

const launchCalls = vi.hoisted(() => [] as Array<{ port: number }>);
vi.mock("./chrome.js", () => ({
  isChromeCdpReady: vi.fn(async () => reachable),
  isChromeReachable: vi.fn(async () => reachable),
  launchClawdChrome: vi.fn(async (_resolved: unknown, profile: { cdpPort: number }) => {
    launchCalls.push({ port: profile.cdpPort });
    reachable = true;
    return {
      pid: 123,
      exe: { kind: "chrome", path: "/fake/chrome" },
      userDataDir: "/tmp/clawd",
      cdpPort: profile.cdpPort,
      startedAt: Date.now(),
      proc,
    };
  }),
  resolveClawdUserDataDir: vi.fn(() => "/tmp/clawd"),
  stopClawdChrome: vi.fn(async () => {
    reachable = false;
  }),
}));

vi.mock("./cdp.js", () => ({
  createTargetViaCdp: cdpMocks.createTargetViaCdp,
  normalizeCdpWsUrl: vi.fn((wsUrl: string) => wsUrl),
  snapshotAria: cdpMocks.snapshotAria,
  getHeadersWithAuth: vi.fn(() => ({})),
  appendCdpPath: vi.fn((cdpUrl: string, path: string) => {
    const base = cdpUrl.replace(/\/$/, "");
    const suffix = path.startsWith("/") ? path : `/${path}`;
    return `${base}${suffix}`;
  }),
}));

vi.mock("./navigation-guard.js", () => ({
  assertBrowserNavigationAllowed: vi.fn(async () => {}),
}));

vi.mock("./pw-ai.js", () => pwMocks);

vi.mock("../media/store.js", () => ({
  ensureMediaDir: vi.fn(async () => {}),
  saveMediaBuffer: vi.fn(async () => ({ path: "/tmp/fake.png" })),
}));

vi.mock("./screenshot.js", () => ({
  DEFAULT_BROWSER_SCREENSHOT_MAX_BYTES: 128,
  DEFAULT_BROWSER_SCREENSHOT_MAX_SIDE: 64,
  normalizeBrowserScreenshot: vi.fn(async (buf: Buffer) => ({
    buffer: buf,
    contentType: "image/png",
  })),
}));

async function getFreePort(): Promise<number> {
  while (true) {
    const port = await new Promise<number>((resolve, reject) => {
      const s = createServer();
      s.once("error", reject);
      s.listen(0, "127.0.0.1", () => {
        const assigned = (s.address() as AddressInfo).port;
        s.close((err) => (err ? reject(err) : resolve(assigned)));
      });
    });
    if (port < 65535) return port;
  }
}

function makeResponse(
  body: unknown,
  init?: { ok?: boolean; status?: number; text?: string },
): Response {
  const ok = init?.ok ?? true;
  const status = init?.status ?? 200;
  const text = init?.text ?? "";
  return {
    ok,
    status,
    json: async () => body,
    text: async () => text,
  } as unknown as Response;
}

describe("browser control server", () => {
  beforeEach(async () => {
    reachable = false;
    cfgAttachOnly = false;
    createTargetId = null;

    cdpMocks.createTargetViaCdp.mockImplementation(async () => {
      if (createTargetId) return { targetId: createTargetId };
      throw new Error("cdp disabled");
    });

    for (const fn of Object.values(pwMocks)) fn.mockClear();
    for (const fn of Object.values(cdpMocks)) fn.mockClear();

    testPort = await getFreePort();
    cdpBaseUrl = `http://127.0.0.1:${testPort + 1}`;

    // Minimal CDP JSON endpoints used by the server.
    let putNewCalls = 0;
    vi.stubGlobal(
      "fetch",
      vi.fn(async (url: string, init?: RequestInit) => {
        const u = String(url);
        if (u.includes("/json/list")) {
          if (!reachable) return makeResponse([]);
          return makeResponse([
            {
              id: "abcd1234",
              title: "Tab",
              url: "https://example.com",
              webSocketDebuggerUrl: "ws://127.0.0.1/devtools/page/abcd1234",
              type: "page",
            },
            {
              id: "abce9999",
              title: "Other",
              url: "https://other",
              webSocketDebuggerUrl: "ws://127.0.0.1/devtools/page/abce9999",
              type: "page",
            },
          ]);
        }
        if (u.includes("/json/new?")) {
          if (init?.method === "PUT") {
            putNewCalls += 1;
            if (putNewCalls === 1) {
              return makeResponse({}, { ok: false, status: 405, text: "" });
            }
          }
          return makeResponse({
            id: "newtab1",
            title: "",
            url: "about:blank",
            webSocketDebuggerUrl: "ws://127.0.0.1/devtools/page/newtab1",
            type: "page",
          });
        }
        if (u.includes("/json/activate/")) return makeResponse("ok");
        if (u.includes("/json/close/")) return makeResponse("ok");
        return makeResponse({}, { ok: false, status: 500, text: "unexpected" });
      }),
    );
  });

  afterEach(async () => {
    vi.unstubAllGlobals();
    vi.restoreAllMocks();
    const { stopBrowserControlServer } = await import("./server.js");
    await stopBrowserControlServer();
  });

  it("skips default maxChars when explicitly set to zero", async () => {
    const { startBrowserControlServerFromConfig } = await import("./server.js");
    await startBrowserControlServerFromConfig();
    const base = `http://127.0.0.1:${testPort}`;
    await realFetch(`${base}/start`, { method: "POST" }).then((r) => r.json());

    const snapAi = (await realFetch(`${base}/snapshot?format=ai&maxChars=0`).then((r) =>
      r.json(),
    )) as { ok: boolean; format?: string };
    expect(snapAi.ok).toBe(true);
    expect(snapAi.format).toBe("ai");

    const [call] = pwMocks.snapshotAiViaPlaywright.mock.calls.at(-1) ?? [];
    expect(call).toEqual({
      cdpUrl: cdpBaseUrl,
      targetId: "abcd1234",
    });
  });

  it("validates agent inputs (agent routes)", async () => {
    const { startBrowserControlServerFromConfig } = await import("./server.js");
    await startBrowserControlServerFromConfig();
    const base = `http://127.0.0.1:${testPort}`;
    await realFetch(`${base}/start`, { method: "POST" }).then((r) => r.json());

    const navMissing = await realFetch(`${base}/navigate`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({}),
    });
    expect(navMissing.status).toBe(400);

    const actMissing = await realFetch(`${base}/act`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({}),
    });
    expect(actMissing.status).toBe(400);

    const clickMissingRef = await realFetch(`${base}/act`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ kind: "click" }),
    });
    expect(clickMissingRef.status).toBe(400);

    const scrollMissingRef = await realFetch(`${base}/act`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ kind: "scrollIntoView" }),
    });
    expect(scrollMissingRef.status).toBe(400);

    const scrollSelectorUnsupported = await realFetch(`${base}/act`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ kind: "scrollIntoView", selector: "button.save" }),
    });
    expect(scrollSelectorUnsupported.status).toBe(400);

    const clickBadButton = await realFetch(`${base}/act`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ kind: "click", ref: "1", button: "nope" }),
    });
    expect(clickBadButton.status).toBe(400);

    const clickBadModifiers = await realFetch(`${base}/act`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ kind: "click", ref: "1", modifiers: ["Nope"] }),
    });
    expect(clickBadModifiers.status).toBe(400);

    const typeBadText = await realFetch(`${base}/act`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ kind: "type", ref: "1", text: 123 }),
    });
    expect(typeBadText.status).toBe(400);

    const uploadMissingPaths = await realFetch(`${base}/hooks/file-chooser`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({}),
    });
    expect(uploadMissingPaths.status).toBe(400);

    const dialogMissingAccept = await realFetch(`${base}/hooks/dialog`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({}),
    });
    expect(dialogMissingAccept.status).toBe(400);

    const snapDefault = (await realFetch(`${base}/snapshot?format=wat`).then((r) => r.json())) as {
      ok: boolean;
      format?: string;
    };
    expect(snapDefault.ok).toBe(true);
    expect(snapDefault.format).toBe("ai");

    const screenshotBadCombo = await realFetch(`${base}/screenshot`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ fullPage: true, element: "body" }),
    });
    expect(screenshotBadCombo.status).toBe(400);
  });

  it("covers common error branches", async () => {
    cfgAttachOnly = true;
    const { startBrowserControlServerFromConfig } = await import("./server.js");
    await startBrowserControlServerFromConfig();
    const base = `http://127.0.0.1:${testPort}`;

    const missing = await realFetch(`${base}/tabs/open`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({}),
    });
    expect(missing.status).toBe(400);

    reachable = false;
    const started = (await realFetch(`${base}/start`, {
      method: "POST",
    }).then((r) => r.json())) as { error?: string };
    expect(started.error ?? "").toMatch(/attachOnly/i);
  });

  it("allows attachOnly servers to ensure reachability via callback", async () => {
    cfgAttachOnly = true;
    reachable = false;
    const { startBrowserBridgeServer } = await import("./bridge-server.js");

    const ensured = vi.fn(async () => {
      reachable = true;
    });

    const bridge = await startBrowserBridgeServer({
      resolved: {
        enabled: true,
        controlUrl: "http://127.0.0.1:0",
        controlHost: "127.0.0.1",
        controlPort: 0,
        cdpProtocol: "http",
        cdpHost: "127.0.0.1",
        cdpIsLoopback: true,
        color: "#FF4500",
        headless: true,
        noSandbox: false,
        attachOnly: true,
        defaultProfile: "clawd",
        profiles: {
          clawd: { cdpPort: testPort + 1, color: "#FF4500" },
        },
      },
      onEnsureAttachTarget: ensured,
    });

    const started = (await realFetch(`${bridge.baseUrl}/start`, {
      method: "POST",
    }).then((r) => r.json())) as { ok?: boolean; error?: string };
    expect(started.error).toBeUndefined();
    expect(started.ok).toBe(true);
    const status = (await realFetch(`${bridge.baseUrl}/`).then((r) => r.json())) as {
      running?: boolean;
    };
    expect(status.running).toBe(true);
    expect(ensured).toHaveBeenCalledTimes(1);

    await new Promise<void>((resolve) => bridge.server.close(() => resolve()));
  });

  it("opens tabs via CDP createTarget path", async () => {
    const { startBrowserControlServerFromConfig } = await import("./server.js");
    await startBrowserControlServerFromConfig();
    const base = `http://127.0.0.1:${testPort}`;
    await realFetch(`${base}/start`, { method: "POST" }).then((r) => r.json());

    createTargetId = "abcd1234";
    const opened = (await realFetch(`${base}/tabs/open`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ url: "https://example.com" }),
    }).then((r) => r.json())) as { targetId?: string };
    expect(opened.targetId).toBe("abcd1234");
  });
});
