import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
import { AssistantCloudAPI, CloudAPIError } from "../AssistantCloudAPI";
import { CloudResponseError } from "../cloudResponse";
import { assistantCloudTraceExportOptions } from "../telemetry";

const createAccessToken = (subject: string) =>
  `${Buffer.from(JSON.stringify({ alg: "none" })).toString("base64url")}.${Buffer.from(JSON.stringify({ exp: 4102444800, sub: subject })).toString("base64url")}.sig`;

describe("AssistantCloudAPI", () => {
  beforeEach(() => {
    vi.restoreAllMocks();
  });

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

  it("serializes query params, merges auth headers, and sends JSON body", async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      headers: new Headers(),
      json: vi.fn().mockResolvedValue({ data: "ok" }),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    await api.makeRawRequest("/threads", {
      method: "POST",
      query: { archived: false, detailed: true, page: 2 },
      headers: { "X-Test": "1" },
      body: { hello: "world" },
    });

    expect(fetchMock).toHaveBeenCalledTimes(1);
    const [url, init] = fetchMock.mock.calls[0]!;

    // false values are excluded from query params; others are serialized
    expect(url.toString()).toBe(
      "https://backend.assistant-api.com/v1/threads?detailed=true&page=2",
    );

    // Real API-key auth headers are merged with custom headers
    expect(init.headers).toMatchObject({
      Authorization: "Bearer test-key",
      "Aui-User-Id": "u-1",
      "Aui-Workspace-Id": "w-1",
      "Aui-Sdk": expect.stringMatching(/^assistant-cloud\//),
      "Content-Type": "application/json",
      "X-Test": "1",
    });

    expect(init.method).toBe("POST");
    expect(init.body).toBe(JSON.stringify({ hello: "world" }));
  });

  it("ignores identities that cannot travel in a header", () => {
    const api = new AssistantCloudAPI({
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });
    api.registerSdk({ name: "bad name", version: "1.0.0" });
    api.registerSdk({ name: "@scope/pkg", version: "1.0.0 ok" });
    api.registerSdk({ name: "@scope/pkg\ttab", version: "1.0.0" });
    api.registerSdk({ name: "@scope/ok", version: " 1.0.0 " });

    expect(api.sdkHeader().split(" ")).toEqual([
      expect.stringMatching(/^assistant-cloud\//),
      "@scope/ok/1.0.0",
    ]);
  });

  it("sends each registered SDK identity once in registration order", async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      headers: new Headers(),
      json: vi.fn().mockResolvedValue({}),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    api.registerSdk({ name: " @assistant-ui/core ", version: " 0.3.18 " });
    api.registerSdk({ name: "@assistant-ui/core", version: "0.3.18" });
    api.registerSdk({ name: "@assistant-ui/ai-sdk", version: "0.0.5" });
    api.registerSdk({ name: " ", version: "0.0.5" });
    api.registerSdk({ name: "@assistant-ui/react-langgraph", version: " " });

    await api.makeRawRequest("/threads", {
      headers: { "Aui-Sdk": "overridden" },
    });

    const [, init] = fetchMock.mock.calls[0]!;
    expect(init.headers).toMatchObject({ "Aui-Sdk": api.sdkHeader() });
    expect(api.sdkHeader().split(" ")).toEqual([
      expect.stringMatching(/^assistant-cloud\//),
      "@assistant-ui/core/0.3.18",
      "@assistant-ui/ai-sdk/0.0.5",
    ]);
  });

  it("uses custom baseUrl when provided with apiKey config", async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      headers: new Headers(),
      json: vi.fn().mockResolvedValue({}),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      baseUrl: "https://custom.example.com",
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    await api.makeRawRequest("/threads");

    const [url] = fetchMock.mock.calls[0]!;
    expect(url.toString()).toBe("https://custom.example.com/v1/threads");
  });

  it("strips a trailing slash from a custom baseUrl", async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      headers: new Headers(),
      json: vi.fn().mockResolvedValue({}),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      baseUrl: "https://custom.example.com/",
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    await api.makeRawRequest("/threads");

    const [url] = fetchMock.mock.calls[0]!;
    expect(url.toString()).toBe("https://custom.example.com/v1/threads");
  });

  it("uses the same base URL for anonymous auth and trace export with two trailing slashes", async () => {
    const baseUrl = "https://custom.example.com//";
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      json: vi.fn().mockResolvedValue({
        access_token: createAccessToken("user"),
        refresh_token: {
          token: "refresh-token",
          expires_at: "2099-01-01",
        },
      }),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({ baseUrl, anonymous: true });
    await api.initializeAuth();

    const traceUrl = assistantCloudTraceExportOptions({
      apiKey: "test-key",
      baseUrl,
    }).url;
    expect(fetchMock).toHaveBeenCalledWith(
      traceUrl.replace("/v1/traces", "/v1/auth/tokens/anonymous"),
      expect.objectContaining({ method: "POST" }),
    );
  });

  it("rejects before fetch when auth token callback returns null", async () => {
    const fetchMock = vi.fn();
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      baseUrl: "https://test.example.com",
      authToken: async () => null,
    });

    await expect(api.makeRawRequest("/threads")).rejects.toThrow(
      "Authorization failed",
    );
    expect(fetchMock).not.toHaveBeenCalled();
  });

  it("rejects old headers if auth is invalidated while headers resolve", async () => {
    const userAToken = createAccessToken("user-a");
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      headers: new Headers(),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      baseUrl: "https://test.example.com",
      authToken: async () => userAToken,
    });
    const oldHeaders = await api._auth.getAuthHeaders();
    if (!oldHeaders) throw new Error("Expected auth headers");

    let resolveHeaders: (headers: Record<string, string>) => void = () => {};
    vi.spyOn(api._auth, "getAuthHeaders").mockImplementationOnce(
      () =>
        new Promise((resolve) => {
          resolveHeaders = resolve;
        }),
    );

    const oldRequest = api.makeRawRequest("/threads");
    api.invalidateAuth();
    resolveHeaders(oldHeaders);

    await expect(oldRequest).rejects.toThrow("Authorization failed");
    expect(fetchMock).not.toHaveBeenCalled();
  });

  it("uses fresh headers for a request started after invalidation", async () => {
    const userAToken = createAccessToken("user-a");
    const userBToken = createAccessToken("user-b");
    const internalUserAToken = createAccessToken("internal-user-a");
    let currentToken = userAToken;
    const authToken = vi.fn(async () => currentToken);
    const fetchMock = vi
      .fn()
      .mockResolvedValueOnce({
        ok: true,
        headers: new Headers({ Authorization: `Bearer ${internalUserAToken}` }),
      })
      .mockResolvedValue({ ok: true, headers: new Headers() });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      baseUrl: "https://test.example.com",
      authToken,
    });
    await api.makeRawRequest("/threads");
    expect(await api._auth.getAuthHeaders()).toEqual({
      Authorization: `Bearer ${internalUserAToken}`,
    });

    currentToken = userBToken;
    api.invalidateAuth();
    await api.makeRawRequest("/threads");

    expect(fetchMock).toHaveBeenCalledTimes(2);
    expect(fetchMock.mock.calls[0]?.[1]?.headers).toMatchObject({
      Authorization: `Bearer ${userAToken}`,
    });
    expect(fetchMock.mock.calls[1]?.[1]?.headers).toMatchObject({
      Authorization: `Bearer ${userBToken}`,
    });
    expect(authToken).toHaveBeenCalledTimes(2);
  });

  it("stops authenticating after the provider session is invalidated", async () => {
    const userAToken = createAccessToken("user-a");
    const internalUserAToken = createAccessToken("internal-user-a");
    let currentToken: string | null = userAToken;
    const authToken = vi.fn(async () => currentToken);
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      headers: new Headers({ Authorization: `Bearer ${internalUserAToken}` }),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      baseUrl: "https://test.example.com",
      authToken,
    });
    await api.makeRawRequest("/threads");
    expect(await api._auth.getAuthHeaders()).toEqual({
      Authorization: `Bearer ${internalUserAToken}`,
    });

    currentToken = null;
    api.invalidateAuth();

    await expect(api.makeRawRequest("/threads")).rejects.toThrow(
      "Authorization failed",
    );
    expect(fetchMock).toHaveBeenCalledOnce();
    expect(authToken).toHaveBeenCalledTimes(2);
  });

  it("does not let an old response restore a superseded identity", async () => {
    const userAToken = createAccessToken("user-a");
    const userBToken = createAccessToken("user-b");
    const internalUserAToken = createAccessToken("internal-user-a");
    let currentToken = userAToken;
    let resolveUserAResponse: (response: Response) => void = () => {};
    const userAResponse = new Promise<Response>((resolve) => {
      resolveUserAResponse = resolve;
    });
    const fetchMock = vi
      .fn<typeof fetch>()
      .mockImplementationOnce(() => userAResponse)
      .mockResolvedValue({
        ok: true,
        headers: new Headers(),
      } as Response);
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      baseUrl: "https://test.example.com",
      authToken: async () => currentToken,
    });

    const userARequest = api.makeRawRequest("/threads");
    await vi.waitFor(() => expect(fetchMock).toHaveBeenCalledTimes(1));

    currentToken = userBToken;
    api.invalidateAuth();
    await api.makeRawRequest("/threads");

    resolveUserAResponse({
      ok: true,
      headers: new Headers({
        Authorization: `Bearer ${internalUserAToken}`,
      }),
    } as Response);
    await userARequest;
    await api.makeRawRequest("/threads");

    expect(fetchMock.mock.calls[0]?.[1]?.headers).toMatchObject({
      Authorization: `Bearer ${userAToken}`,
    });
    expect(fetchMock.mock.calls[1]?.[1]?.headers).toMatchObject({
      Authorization: `Bearer ${userBToken}`,
    });
    expect(fetchMock.mock.calls[2]?.[1]?.headers).toMatchObject({
      Authorization: `Bearer ${userBToken}`,
    });
  });

  it("accepts token rotations from concurrent requests in the same session", async () => {
    const providerToken = createAccessToken("user-a");
    const firstInternalToken = createAccessToken("internal-user-a-1");
    const secondInternalToken = createAccessToken("internal-user-a-2");
    const authToken = vi.fn(async () => providerToken);
    let resolveFirstResponse: (response: Response) => void = () => {};
    let resolveSecondResponse: (response: Response) => void = () => {};
    const firstResponse = new Promise<Response>((resolve) => {
      resolveFirstResponse = resolve;
    });
    const secondResponse = new Promise<Response>((resolve) => {
      resolveSecondResponse = resolve;
    });
    const fetchMock = vi
      .fn<typeof fetch>()
      .mockImplementationOnce(() => firstResponse)
      .mockImplementationOnce(() => secondResponse)
      .mockResolvedValue({ ok: true, headers: new Headers() } as Response);
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      baseUrl: "https://test.example.com",
      authToken,
    });

    const firstRequest = api.makeRawRequest("/threads");
    const secondRequest = api.makeRawRequest("/threads");
    await vi.waitFor(() => expect(fetchMock).toHaveBeenCalledTimes(2));

    resolveFirstResponse({
      ok: true,
      headers: new Headers({
        Authorization: `Bearer ${firstInternalToken}`,
      }),
    } as Response);
    await firstRequest;

    resolveSecondResponse({
      ok: true,
      headers: new Headers({
        Authorization: `Bearer ${secondInternalToken}`,
      }),
    } as Response);
    await secondRequest;
    await api.makeRawRequest("/threads");

    expect(fetchMock.mock.calls[2]?.[1]?.headers).toMatchObject({
      Authorization: `Bearer ${secondInternalToken}`,
    });
    expect(authToken).toHaveBeenCalledOnce();
  });

  it("does not cache a malformed rotated token", async () => {
    const providerToken = createAccessToken("user-a");
    const authToken = vi.fn(async () => providerToken);
    const fetchMock = vi
      .fn()
      .mockResolvedValueOnce({
        ok: true,
        headers: new Headers({ Authorization: "Bearer malformed" }),
      })
      .mockResolvedValue({ ok: true, headers: new Headers() });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      baseUrl: "https://test.example.com",
      authToken,
    });

    await expect(api.makeRawRequest("/threads")).rejects.toThrow(
      "Unable to determine the token expiry",
    );
    await api.makeRawRequest("/threads");

    expect(fetchMock.mock.calls[1]?.[1]?.headers).toMatchObject({
      Authorization: `Bearer ${providerToken}`,
    });
    expect(authToken).toHaveBeenCalledOnce();
  });

  it("returns false from initializeAuth when auth token callback returns null", async () => {
    const api = new AssistantCloudAPI({
      baseUrl: "https://test.example.com",
      authToken: async () => null,
    });

    await expect(api.initializeAuth()).resolves.toBe(false);
  });

  it("rejects initializeAuth with context for malformed anonymous responses", async () => {
    vi.stubGlobal(
      "fetch",
      vi.fn().mockResolvedValue({
        ok: true,
        json: vi.fn().mockResolvedValue({
          access_token: 123,
          refresh_token: null,
        }),
      }),
    );

    const api = new AssistantCloudAPI({
      baseUrl: "https://test.example.com",
      anonymous: true,
    });

    await expect(api.initializeAuth()).rejects.toThrow(
      new CloudResponseError(
        'Invalid Assistant Cloud response for "anonymous auth token response.access_token": expected a string',
      ),
    );
  });

  it("preserves the current error shape for JSON error responses without a code", async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: false,
      status: 400,
      headers: new Headers(),
      text: vi
        .fn()
        .mockResolvedValue(
          JSON.stringify({ message: "invalid request payload" }),
        ),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    const error = await api.makeRawRequest("/threads").catch((e) => e);
    expect(error).toBeInstanceOf(CloudAPIError);
    expect(error.name).toBe("CloudAPIError");
    expect(error.message).toBe("invalid request payload");
    expect(error.status).toBe(400);
    expect(error.code).toBeUndefined();
    expect(error.details).toBeUndefined();
  });

  it("exposes the plan-limit error code and details", async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: false,
      status: 402,
      headers: new Headers(),
      text: vi.fn().mockResolvedValue(
        JSON.stringify({
          error: "plan_limit_reached",
          plan: "free",
          period_end: "2026-10-01T00:00:00.000Z",
          cap: 100,
        }),
      ),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    const error = await api.makeRawRequest("/threads").catch((e) => e);
    expect(error).toBeInstanceOf(CloudAPIError);
    expect(error.message).toBe(
      'Request failed with status 402, {"error":"plan_limit_reached","plan":"free","period_end":"2026-10-01T00:00:00.000Z","cap":100}',
    );
    expect(error.status).toBe(402);
    expect(error.code).toBe("plan_limit_reached");
    expect(error.details).toEqual({
      plan: "free",
      period_end: "2026-10-01T00:00:00.000Z",
      cap: 100,
    });
  });

  it("exposes rate-limit error codes with empty details", async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: false,
      status: 429,
      headers: new Headers(),
      text: vi
        .fn()
        .mockResolvedValue(JSON.stringify({ error: "rate_limited" })),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    const error = await api.makeRawRequest("/threads").catch((e) => e);
    expect(error).toBeInstanceOf(CloudAPIError);
    expect(error.message).toBe(
      'Request failed with status 429, {"error":"rate_limited"}',
    );
    expect(error.status).toBe(429);
    expect(error.code).toBe("rate_limited");
    expect(error.details).toEqual({});
  });

  it("throws generic error with status for non-JSON error responses", async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: false,
      status: 502,
      headers: new Headers(),
      text: vi.fn().mockResolvedValue("Bad Gateway"),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    const error = await api.makeRawRequest("/threads").catch((e) => e);
    expect(error).toBeInstanceOf(CloudAPIError);
    expect(error.message).toBe("Request failed with status 502, Bad Gateway");
    expect(error.status).toBe(502);
  });

  it("makeRequest returns parsed JSON from a successful response", async () => {
    const responseData = { threads: [{ id: "t-1" }] };
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      headers: new Headers(),
      text: vi.fn().mockResolvedValue(JSON.stringify(responseData)),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    const result = await api.makeRequest("/threads");
    expect(result).toEqual(responseData);
  });

  it("makeRequest returns undefined from a successful empty response", async () => {
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      status: 204,
      headers: new Headers(),
      text: vi.fn().mockResolvedValue(""),
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    await expect(
      api.makeRequest("/threads/t-1", { method: "DELETE" }),
    ).resolves.toBeUndefined();
  });

  it("makeRequest returns undefined when content-length is zero", async () => {
    const text = vi.fn().mockResolvedValue("");
    const fetchMock = vi.fn().mockResolvedValue({
      ok: true,
      status: 200,
      headers: new Headers({ "content-length": "0" }),
      text,
    });
    vi.stubGlobal("fetch", fetchMock);

    const api = new AssistantCloudAPI({
      apiKey: "test-key",
      userId: "u-1",
      workspaceId: "w-1",
    });

    await expect(api.makeRequest("/threads/t-1")).resolves.toBeUndefined();
    expect(text).not.toHaveBeenCalled();
  });
});