// @vitest-environment node
import { describe, expect, it, vi } from "vitest";

type TestWebConfig = {
  nodeEnv: string;
  sessionSecret: string;
  routing: {
    appBaseDomain: string;
    protocol: "http" | "https";
  };
};

const testWebConfig: TestWebConfig = {
  nodeEnv: "test",
  sessionSecret: "dGVzdC1zZXNzaW9uLXNlY3JldC13aXRoLWVub3VnaC1lbnRyb3B5LTEyMzQ1Njc4OTA=",
  routing: {
    appBaseDomain: "localhost",
    protocol: "http",
  },
};

vi.doMock("@toolctrl/config", async () => {
  const actual = await vi.importActual<typeof import("@toolctrl/config")>("@toolctrl/config");
  return {
    ...actual,
    loadRequiredWebConfig: () => testWebConfig,
  };
});

vi.mock("./db/tenants.db.server", () => ({
  getMyTenants: vi.fn(),
  getTenant: vi.fn(),
}));

vi.mock("./db/users.db.server", () => ({
  getUser: vi.fn(),
}));

// R-P2a S4b — Store/Lifecycle hinter dem additiven Revoke-Check mocken, um die Revoke-Durchsetzung
// in requireUserId deterministisch zu testen.
const authStoreMock = vi.hoisted(() => ({ getActiveSessionByToken: vi.fn() }));
vi.mock("~/services/auth/sessionStore.server", () => ({
  getActiveSessionByToken: (...args: unknown[]) => authStoreMock.getActiveSessionByToken(...args),
}));
vi.mock("~/services/auth/sessionLifecycle.server", () => ({
  endServerSession: vi.fn(),
  startServerSession: vi.fn(),
  extractSessionDeviceContext: vi.fn(),
}));

let sessionModule = await import("./session.server");
let { createUserSession, generateCSRFToken, getUserInfo, requireUser, requireUserId, setCSRFToken, storage, validateCSRFToken } =
  sessionModule;

async function importSessionServerWithConfig(config: typeof testWebConfig) {
  Object.assign(testWebConfig, config);
  vi.resetModules();
  sessionModule = await import("./session.server");
  ({ createUserSession, generateCSRFToken, getUserInfo, requireUser, requireUserId, setCSRFToken, storage, validateCSRFToken } =
    sessionModule);
  return sessionModule;
}

async function requestWithSession({
  body,
  csrf,
  headers,
  legacyCrsf,
}: {
  body?: BodyInit;
  csrf?: string;
  headers?: HeadersInit;
  legacyCrsf?: string;
}) {
  const session = await storage.getSession();
  if (csrf !== undefined) session.set("csrf", csrf);
  if (legacyCrsf !== undefined) session.set("crsf", legacyCrsf);

  return new Request("https://example.test/register", {
    method: "POST",
    headers: {
      Cookie: (await storage.commitSession(session)).split(";")[0],
      ...headers,
    },
    body,
  });
}

describe("setLoggedUser tenant caching", () => {
  it("fetches the tenant once and exposes it on the result so callers can skip a second getTenant", async () => {
    const tenants = await import("./db/tenants.db.server");
    const getTenantMock = vi.mocked(tenants.getTenant);
    const getMyTenantsMock = vi.mocked(tenants.getMyTenants);
    getTenantMock.mockReset();
    getMyTenantsMock.mockReset();
    getTenantMock.mockResolvedValue({ id: "tenant-1", slug: "tenant-1", name: "T1" } as never);

    const { setLoggedUser } = await import("./session.server");
    const result = await setLoggedUser({ id: "user-1", email: "u@example.com", defaultTenantId: "tenant-1" });

    expect(getTenantMock).toHaveBeenCalledTimes(1);
    expect(getMyTenantsMock).not.toHaveBeenCalled();
    expect(result).toEqual({
      userId: "user-1",
      defaultTenantId: "tenant-1",
      defaultTenant: { id: "tenant-1", slug: "tenant-1", name: "T1" },
    });
  });

  it("falls back to the first tenant membership when the stored default tenant is missing", async () => {
    const tenants = await import("./db/tenants.db.server");
    const getTenantMock = vi.mocked(tenants.getTenant);
    const getMyTenantsMock = vi.mocked(tenants.getMyTenants);
    getTenantMock.mockReset();
    getMyTenantsMock.mockReset();
    getTenantMock.mockResolvedValue(null);
    getMyTenantsMock.mockResolvedValue([{ id: "tenant-fallback", slug: "fallback", name: "Fallback" }] as never);

    const { setLoggedUser } = await import("./session.server");
    const result = await setLoggedUser({ id: "user-1", email: "u@example.com", defaultTenantId: "tenant-missing" });

    expect(getTenantMock).toHaveBeenCalledWith("tenant-missing");
    expect(getMyTenantsMock).toHaveBeenCalledWith("user-1");
    expect(result).toEqual({
      userId: "user-1",
      defaultTenantId: "tenant-fallback",
      defaultTenant: null,
    });
  });

  it("returns an empty default tenant id when the user has no tenant memberships", async () => {
    const tenants = await import("./db/tenants.db.server");
    const getTenantMock = vi.mocked(tenants.getTenant);
    const getMyTenantsMock = vi.mocked(tenants.getMyTenants);
    getTenantMock.mockReset();
    getMyTenantsMock.mockReset();
    getMyTenantsMock.mockResolvedValue([]);

    const { setLoggedUser } = await import("./session.server");
    const result = await setLoggedUser({ id: "user-1", email: "u@example.com", defaultTenantId: null });

    expect(getTenantMock).not.toHaveBeenCalled();
    expect(getMyTenantsMock).toHaveBeenCalledWith("user-1");
    expect(result).toEqual({
      userId: "user-1",
      defaultTenantId: "",
      defaultTenant: null,
    });
  });
});

describe("session cookie policy", () => {
  it("serializes hardened production session cookie attributes without exposing the session secret", async () => {
    const productionSecret = "production-session-secret-with-enough-entropy";
    const { storage } = await importSessionServerWithConfig({
      nodeEnv: "production",
      sessionSecret: productionSecret,
      routing: {
        appBaseDomain: "example.com",
        protocol: "https",
      },
    });
    const session = await storage.getSession();
    session.set("userId", "user-1");

    const header = await storage.commitSession(session);

    expect(header).toContain("RJ_session=");
    expect(header).toContain("Domain=example.com");
    expect(header).toContain("SameSite=Lax");
    expect(header).toContain("Secure");
    expect(header).toContain("HttpOnly");
    expect(header).toContain("Path=/");
    expect(header).not.toContain(productionSecret);
  });

  it("keeps local session cookies domainless", async () => {
    const { storage } = await importSessionServerWithConfig({
      nodeEnv: "test",
      sessionSecret: "local-session-secret-with-enough-entropy",
      routing: {
        appBaseDomain: "localhost",
        protocol: "http",
      },
    });
    const header = await storage.commitSession(await storage.getSession());

    expect(header).toContain("RJ_session=");
    expect(header).not.toContain("Domain=");
    expect(header).not.toContain("Secure");
  });
});

describe("session CSRF helpers", () => {
  it("generates and stores CSRF tokens on the csrf session key", async () => {
    const session = await storage.getSession();
    const token = setCSRFToken(session);

    expect(token).toEqual(expect.any(String));
    expect(token).toHaveLength(generateCSRFToken().length);
    expect(session.get("csrf")).toBe(token);
    expect(session.get("crsf")).toBeUndefined();
  });

  it("emits 64-hex-char (32-byte) CSRF tokens — NIST-recommended size, not 100 bytes (perf-quickwins item 8)", () => {
    const token = generateCSRFToken();
    expect(token).toHaveLength(64);
    expect(token).toMatch(/^[a-f0-9]{64}$/);
  });

  it("reads csrf from the central session contract", async () => {
    const session = await storage.getSession();
    session.set("csrf", "session-token");
    session.set("crsf", "legacy-token");

    const request = new Request("https://example.test", {
      headers: { Cookie: (await storage.commitSession(session)).split(";")[0] },
    });

    await expect(getUserInfo(request)).resolves.toMatchObject({ csrf: "session-token" });
  });

  it("validates a matching request token", async () => {
    const request = await requestWithSession({
      csrf: "session-token",
      headers: { "Content-Type": "application/x-www-form-urlencoded" },
      body: new URLSearchParams({ csrf: "session-token" }),
    });

    await expect(validateCSRFToken(request)).resolves.toBeUndefined();
  });

  it("validates a matching request token from a csrf header", async () => {
    const request = await requestWithSession({
      csrf: "session-token",
      headers: { "x-csrf-token": "session-token" },
      body: JSON.stringify({}),
    });

    await expect(validateCSRFToken(request)).resolves.toBeUndefined();
  });

  it("does not read the request body when the csrf token is supplied via header (perf-quickwins item 5)", async () => {
    const request = await requestWithSession({
      csrf: "session-token",
      headers: {
        "x-csrf-token": "session-token",
        "Content-Type": "application/x-www-form-urlencoded",
      },
      body: new URLSearchParams({ csrf: "session-token" }),
    });

    const cloneSpy = vi.spyOn(request, "clone");

    await expect(validateCSRFToken(request)).resolves.toBeUndefined();
    expect(cloneSpy).not.toHaveBeenCalled();

    cloneSpy.mockRestore();
  });

  it("validates a matching request token from multipart form data", async () => {
    const body = new FormData();
    body.set("csrf", "session-token");

    const request = await requestWithSession({
      csrf: "session-token",
      body,
    });

    await expect(validateCSRFToken(request)).resolves.toBeUndefined();
  });

  it("validates a matching request token from json body data", async () => {
    const request = await requestWithSession({
      csrf: "session-token",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ csrf: "session-token" }),
    });

    await expect(validateCSRFToken(request)).resolves.toBeUndefined();
  });

  it("falls back to URLSearchParams when clients send form bodies with a json content type", async () => {
    const request = await requestWithSession({
      csrf: "session-token",
      headers: { "Content-Type": "application/json" },
      body: "csrf=session-token",
    });

    await expect(validateCSRFToken(request)).resolves.toBeUndefined();
  });

  it("rejects missing session tokens and ignores legacy crsf session data", async () => {
    const request = await requestWithSession({
      legacyCrsf: "legacy-token",
      headers: { "Content-Type": "application/x-www-form-urlencoded" },
      body: new URLSearchParams({ csrf: "legacy-token" }),
    });

    await expect(validateCSRFToken(request)).rejects.toThrow("CSRF Session Token not included.");
  });

  it("rejects missing request tokens", async () => {
    const request = await requestWithSession({ csrf: "session-token" });

    await expect(validateCSRFToken(request)).rejects.toThrow("CSRF Request Token not included.");
  });

  it("rejects mismatched request tokens", async () => {
    const request = await requestWithSession({
      csrf: "session-token",
      headers: { "Content-Type": "application/x-www-form-urlencoded" },
      body: new URLSearchParams({ csrf: "other-token" }),
    });

    await expect(validateCSRFToken(request)).rejects.toThrow("CSRF tokens do not match, try refreshing the page.");
  });

  it("validates from injected formData without touching the request body (B-009 follow-up)", async () => {
    const body = new FormData();
    body.set("csrf", "session-token");
    body.set("name", "ada");

    const request = await requestWithSession({
      csrf: "session-token",
      body,
    });

    // Consume the request body BEFORE calling validateCSRFToken — this is the
    // exact pattern that broke production: an action handler reads form fields
    // first and validates afterwards.
    const consumed = await request.formData();
    expect(consumed.get("name")).toBe("ada");

    const cloneSpy = vi.spyOn(request, "clone");
    await expect(validateCSRFToken(request, { formData: consumed })).resolves.toBeUndefined();
    expect(cloneSpy).not.toHaveBeenCalled();
    cloneSpy.mockRestore();
  });

  it("rejects when injected formData carries a mismatched token", async () => {
    const body = new FormData();
    body.set("csrf", "other-token");

    const request = await requestWithSession({
      csrf: "session-token",
      body,
    });

    const consumed = await request.formData();
    await expect(validateCSRFToken(request, { formData: consumed })).rejects.toThrow(
      "CSRF tokens do not match, try refreshing the page.",
    );
  });

  it("treats blank injected formData csrf values as missing request tokens", async () => {
    const body = new FormData();
    body.set("csrf", "   ");

    const request = await requestWithSession({
      csrf: "session-token",
      body,
    });

    const consumed = await request.formData();
    await expect(validateCSRFToken(request, { formData: consumed })).rejects.toThrow("CSRF Request Token not included.");
  });

  it("headerOnly mode skips the body fallback entirely", async () => {
    const body = new FormData();
    body.set("csrf", "session-token");

    const request = await requestWithSession({
      csrf: "session-token",
      body,
    });

    const cloneSpy = vi.spyOn(request, "clone");
    await expect(validateCSRFToken(request, { headerOnly: true })).rejects.toThrow("CSRF Request Token not included.");
    expect(cloneSpy).not.toHaveBeenCalled();
    cloneSpy.mockRestore();
  });

  it("headerOnly mode accepts a valid header token", async () => {
    const request = await requestWithSession({
      csrf: "session-token",
      headers: { "x-csrf-token": "session-token" },
    });

    await expect(validateCSRFToken(request, { headerOnly: true })).resolves.toBeUndefined();
  });

  it("surfaces a clear error when the body was consumed without supplying formData", async () => {
    const body = new FormData();
    body.set("csrf", "session-token");

    const request = await requestWithSession({
      csrf: "session-token",
      body,
    });

    // Caller drained the body without passing it to validateCSRFToken — the
    // old code path raised an opaque `TypeError: unusable` from undici. We now
    // surface a CSRF-specific error so the misuse is obvious.
    await request.formData();

    await expect(validateCSRFToken(request)).rejects.toThrow(/CSRF body already consumed/);
  });
});

describe("session user guards", () => {
  it("requireUserId returns the current user id from the session", async () => {
    const session = await storage.getSession();
    session.set("userId", "user-1");
    const request = new Request("https://example.test/app/settings", {
      headers: { Cookie: (await storage.commitSession(session)).split(";")[0] },
    });

    await expect(requireUserId(request)).resolves.toBe("user-1");
  });

  it("requireUserId redirects anonymous requests with the current path as redirectTo", async () => {
    const request = new Request("https://example.test/app/settings?tab=profile");

    let response: unknown;
    try {
      await requireUserId(request);
    } catch (error) {
      response = error;
    }

    expect(response).toBeInstanceOf(Response);
    expect((response as Response).status).toBe(302);
    expect((response as Response).headers.get("Location")).toBe("/login?redirectTo=%2Fapp%2Fsettings");
  });

  it("requireUser loads the current user and redirects when the user record no longer exists", async () => {
    const users = await import("./db/users.db.server");
    const getUserMock = vi.mocked(users.getUser);
    const session = await storage.getSession();
    session.set("userId", "user-1");
    const request = new Request("https://example.test/app", {
      headers: { Cookie: (await storage.commitSession(session)).split(";")[0] },
    });
    getUserMock.mockResolvedValueOnce({ id: "user-1", email: "user@example.test" } as never);

    await expect(requireUser({ request })).resolves.toEqual({ id: "user-1", email: "user@example.test" });

    getUserMock.mockResolvedValueOnce(null);
    let response: unknown;
    try {
      await requireUser({ request });
    } catch (error) {
      response = error;
    }

    expect(response).toBeInstanceOf(Response);
    expect((response as Response).status).toBe(302);
    expect((response as Response).headers.get("Location")).toBe("/login");
  });
});

describe("requireUserId server-session revocation (R-P2a S4b)", () => {
  async function requestWithToken(sessionToken: string) {
    const session = await storage.getSession();
    session.set("userId", "user-1");
    session.set("sessionToken", sessionToken);
    return new Request("https://example.test/app/x", {
      headers: { Cookie: (await storage.commitSession(session)).split(";")[0] },
    });
  }

  it("logs out and destroys the cookie when the server session token is revoked", async () => {
    authStoreMock.getActiveSessionByToken.mockResolvedValueOnce(null);
    const request = await requestWithToken("tok-revoked");

    let response: unknown;
    try {
      await requireUserId(request);
    } catch (error) {
      response = error;
    }
    expect(response).toBeInstanceOf(Response);
    expect((response as Response).status).toBe(302);
    expect((response as Response).headers.get("Location")).toContain("/login");
    expect((response as Response).headers.get("Set-Cookie")).toBeTruthy();
  });

  it("allows the request when the server session is still active", async () => {
    authStoreMock.getActiveSessionByToken.mockResolvedValueOnce({ id: "s1" });
    await expect(requireUserId(await requestWithToken("tok-active"))).resolves.toBe("user-1");
  });

  it("fails open (treats the session as valid) when the revoke check throws", async () => {
    authStoreMock.getActiveSessionByToken.mockRejectedValueOnce(new Error("db down"));
    await expect(requireUserId(await requestWithToken("tok-error"))).resolves.toBe("user-1");
  });
});

describe("createUserSession", () => {
  it("persists supported session metadata and omits falsey password-policy flags", async () => {
    const response = await createUserSession(
      {
        userId: "user-1",
        lightOrDarkMode: "dark",
        lng: "en",
        csrf: "csrf-token",
        metrics: { enabled: true, logToConsole: true, saveToDatabase: false, ignoreUrls: ["/healthz"] },
        cookies: [{ category: "analytics", allowed: true }],
        theme: "system",
        passwordPolicyOutdated: false,
      },
      "/dashboard"
    );
    expect(response.status).toBe(302);
    expect(response.headers.get("Location")).toBe("/dashboard");

    const request = new Request("https://example.test/dashboard", {
      headers: { Cookie: (response.headers.get("Set-Cookie") ?? "").split(";")[0] },
    });

    await expect(getUserInfo(request)).resolves.toMatchObject({
      userId: "user-1",
      lightOrDarkMode: "dark",
      lng: "en",
      csrf: "csrf-token",
      metrics: { enabled: true, logToConsole: true, saveToDatabase: false, ignoreUrls: ["/healthz"] },
      cookies: [{ category: "analytics", allowed: true }],
      theme: "system",
      passwordPolicyOutdated: undefined,
    });
  });
});