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

const {
  cookiesSetMock,
  cookiesDeleteMock,
  findUserMock,
  headersGetMock,
  headerStore,
  checkRateLimitMock,
  redirectMock,
  loggerMock,
} = vi.hoisted(() => ({
  cookiesSetMock: vi.fn(),
  cookiesDeleteMock: vi.fn(),
  findUserMock: vi.fn(),
  headersGetMock: vi.fn(() => "127.0.0.1"),
  headerStore: new Map<string, string>(),
  checkRateLimitMock: vi.fn(),
  redirectMock: vi.fn((_path: string) => {
    throw new Error("redirect");
  }),
  loggerMock: { warn: vi.fn(), info: vi.fn() },
}));

vi.mock("next/headers", () => ({
  cookies: async () => ({ set: cookiesSetMock, delete: cookiesDeleteMock }),
  headers: async () => ({
    get: (k: string) => {
      const key = k.toLowerCase();
      if (key === "x-forwarded-for") return headersGetMock();
      // Tests opt-in to setting origin/host/etc. via headerStore;
      // unset = null which lets hasSameOriginRequest treat the
      // request as same-origin (Origin omitted = same-origin per RFC).
      return headerStore.get(key) ?? null;
    },
  }),
}));
vi.mock("next/navigation", () => ({
  redirect: (path: string) => redirectMock(path),
}));
vi.mock("@/lib/db", () => ({
  db: {
    query: {
      operators: { findFirst: (...a: unknown[]) => findUserMock(...a) },
    },
  },
}));
vi.mock("@/lib/rate-limit", () => ({
  checkRateLimit: (...a: unknown[]) => checkRateLimitMock(...a),
}));
vi.mock("@/lib/logger", () => ({ logger: loggerMock }));

const SECRET = "test-secret-not-real";
beforeEach(() => {
  process.env.AUTH_SECRET = SECRET;
  process.env.OPERATOR_TOKEN_VERSION = "1";
  cookiesSetMock.mockReset();
  cookiesDeleteMock.mockReset();
  findUserMock.mockReset();
  checkRateLimitMock.mockReset();
  checkRateLimitMock.mockResolvedValue({ limited: false, count: 1 });
  redirectMock.mockReset();
  redirectMock.mockImplementation((_path: string) => {
    throw new Error("redirect");
  });
  loggerMock.warn.mockReset();
  headerStore.clear();
});

import { loginAction, logoutAction } from "./auth";

const REAL_HASH = bcrypt.hashSync("correct-horse", 10);
const ADMIN_ROW = {
  id: "11111111-1111-1111-1111-111111111111",
  username: "admin",
  role: "admin" as const,
  displayName: "Admin",
  defaultTimezone: "UTC",
  passwordHash: REAL_HASH,
};

function fd(fields: Record<string, string>): FormData {
  const f = new FormData();
  for (const [k, v] of Object.entries(fields)) f.append(k, v);
  return f;
}

describe("loginAction", () => {
  it("issues a session cookie when credentials are correct", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    const prevEnv = process.env.NODE_ENV;
    // @ts-expect-error - test override
    process.env.NODE_ENV = "production";
    try {
      const r = await loginAction(fd({ username: "admin", password: "correct-horse" })).catch(
        (e) => e,
      );
      // Successful login redirects, so the redirect mock throws.
      expect((r as Error).message).toBe("redirect");
      expect(cookiesSetMock).toHaveBeenCalledTimes(1);
      const [name, , attrs] = cookiesSetMock.mock.calls[0]!;
      expect(name).toBe("session");
      expect(attrs).toMatchObject({
        httpOnly: true,
        secure: true,
        sameSite: "lax",
        path: "/",
        maxAge: 30 * 86400,
      });
    } finally {
      // @ts-expect-error - test restore
      process.env.NODE_ENV = prevEnv;
    }
  });

  it("sets secure=false on the cookie when NODE_ENV !== production", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    const prevEnv = process.env.NODE_ENV;
    // @ts-expect-error - test override
    process.env.NODE_ENV = "development";
    try {
      await loginAction(fd({ username: "admin", password: "correct-horse" })).catch(() => {});
      const [, , attrs] = cookiesSetMock.mock.calls[0]!;
      expect(attrs).toMatchObject({ secure: false });
    } finally {
      // @ts-expect-error - test restore
      process.env.NODE_ENV = prevEnv;
    }
  });

  it("returns ok:false on wrong password and does NOT set a cookie", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    const r = await loginAction(fd({ username: "admin", password: "wrong" }));
    expect(r).toEqual({ ok: false, error: "Invalid username or password." });
    expect(cookiesSetMock).not.toHaveBeenCalled();
    expect(loggerMock.warn).toHaveBeenCalled();
  });

  it("returns ok:false on unknown username and STILL invokes bcrypt (timing equivalence)", async () => {
    findUserMock.mockResolvedValue(undefined);
    const cmpSpy = vi.spyOn(bcrypt, "compare");
    await loginAction(fd({ username: "nobody", password: "irrelevant" }));
    expect(cmpSpy).toHaveBeenCalled(); // compared against DUMMY_HASH
    cmpSpy.mockRestore();
  });

  it("returns a clear error when the user has no password_hash set", async () => {
    findUserMock.mockResolvedValue({ ...ADMIN_ROW, passwordHash: null });
    const r = await loginAction(fd({ username: "admin", password: "anything" }));
    expect(r).toEqual({
      ok: false,
      error: "Set a password via scripts/set-password.sh before signing in.",
    });
  });

  it("rejects empty username or password without hitting the DB", async () => {
    const r = await loginAction(fd({ username: "", password: "x" }));
    expect(r).toEqual({ ok: false, error: "Username and password are required." });
    expect(findUserMock).not.toHaveBeenCalled();
  });

  it("rejects username/password >256 chars without invoking bcrypt", async () => {
    const cmpSpy = vi.spyOn(bcrypt, "compare");
    const long = "x".repeat(300);
    const r = await loginAction(fd({ username: long, password: long }));
    expect(r).toEqual({ ok: false, error: "Input too long." });
    expect(cmpSpy).not.toHaveBeenCalled();
    cmpSpy.mockRestore();
  });

  it("matches username case-insensitively", async () => {
    findUserMock.mockImplementation(async () => ADMIN_ROW);
    await loginAction(fd({ username: "ADMIN", password: "correct-horse" })).catch(() => {});
    expect(findUserMock).toHaveBeenCalled();
  });

  it("returns 429 when the rate limit is exhausted", async () => {
    checkRateLimitMock.mockResolvedValue({ limited: true, count: 11 });
    const r = await loginAction(fd({ username: "admin", password: "correct-horse" }));
    expect(r).toEqual({ ok: false, error: "Too many attempts. Try again later." });
    expect(findUserMock).not.toHaveBeenCalled();
  });

  it("logs the failed attempt with username and ip but never the password", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    headersGetMock.mockReturnValue("203.0.113.5, 10.0.0.1");
    await loginAction(fd({ username: "admin", password: "wrong" }));
    const [meta, msg] = loggerMock.warn.mock.calls[0]!;
    expect(meta).toMatchObject({ username: "admin", ip: "203.0.113.5" });
    expect(JSON.stringify(meta)).not.toContain("wrong");
    expect(msg).toMatch(/login failed/i);
  });

  it("redirects to safeRedirect(next) on success", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    await loginAction(fd({
      username: "admin",
      password: "correct-horse",
      next: "/dashboard",
    })).catch(() => {});
    expect(redirectMock).toHaveBeenCalledWith("/dashboard");
  });

  it("redirects to / when next is unsafe", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    await loginAction(fd({
      username: "admin",
      password: "correct-horse",
      next: "//evil.com",
    })).catch(() => {});
    expect(redirectMock).toHaveBeenCalledWith("/");
  });
});

describe("logoutAction", () => {
  it("clears the session cookie and redirects to /login", async () => {
    await logoutAction().catch(() => {});
    expect(cookiesDeleteMock).toHaveBeenCalledWith("session");
    expect(redirectMock).toHaveBeenCalledWith("/login");
  });

  it("is idempotent — clears the cookie even when no session exists", async () => {
    // Real-world: a user with an expired cookie clicks Sign out. cookies.delete
    // doesn't care about pre-existing state and we still issue the redirect.
    cookiesDeleteMock.mockReset();
    await logoutAction().catch(() => {});
    expect(cookiesDeleteMock).toHaveBeenCalledTimes(1);
    expect(cookiesDeleteMock).toHaveBeenCalledWith("session");
  });
});

describe("loginAction — additional cases", () => {
  it("issues a cookie that decrypts to role='user' for a non-admin user", async () => {
    findUserMock.mockResolvedValue({ ...ADMIN_ROW, role: "user" });
    await loginAction(fd({ username: "alice", password: "correct-horse" })).catch(() => {});
    expect(cookiesSetMock).toHaveBeenCalledTimes(1);
    const [, cookieValue] = cookiesSetMock.mock.calls[0]!;
    // The cookie is now AES-GCM encrypted, so we can't peel the payload
    // off raw — decrypt with the same secret loginAction used. This
    // also doubles as a confidentiality smoke test: 'user'/'alice'
    // must NOT appear verbatim in the cookie bytes.
    expect(cookieValue as string).not.toContain("alice");
    expect(cookieValue as string).not.toContain("user");
    const { verifySession } = await import("@/lib/auth-cookie");
    const decoded = await verifySession(cookieValue as string, SECRET);
    expect(decoded?.role).toBe("user");
    expect(decoded?.userId).toBe(ADMIN_ROW.id);
  });

  it("rejects when the user row has an unrecognised role string", async () => {
    findUserMock.mockResolvedValue({ ...ADMIN_ROW, role: "robot" });
    const r = await loginAction(fd({ username: "admin", password: "correct-horse" }));
    expect(r).toEqual({ ok: false, error: "Account is not enabled." });
    expect(cookiesSetMock).not.toHaveBeenCalled();
  });

  it("returns ok:false when AUTH_SECRET is unset (server misconfig)", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    const prev = process.env.AUTH_SECRET;
    delete process.env.AUTH_SECRET;
    try {
      const r = await loginAction(fd({ username: "admin", password: "correct-horse" }));
      expect(r).toEqual({ ok: false, error: "Server is not configured for sign-in." });
      expect(cookiesSetMock).not.toHaveBeenCalled();
    } finally {
      process.env.AUTH_SECRET = prev;
    }
  });

  it("treats whitespace-only username as missing input", async () => {
    const r = await loginAction(fd({ username: "   ", password: "x" }));
    expect(r).toEqual({ ok: false, error: "Username and password are required." });
    expect(findUserMock).not.toHaveBeenCalled();
  });

  it("uses three rate-limit layers: per-IP, per-username, global", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    headersGetMock.mockReturnValue("198.51.100.42");
    await loginAction(fd({ username: "Admin", password: "correct-horse" })).catch(() => {});
    // Three checkRateLimit calls fired in parallel via Promise.all,
    // in this order: ip / user / global.
    expect(checkRateLimitMock).toHaveBeenCalledTimes(3);
    const keys = checkRateLimitMock.mock.calls.map((c) => c[0] as string);
    expect(keys[0]).toBe("login:198.51.100.42");
    // Username key is normalised to lowercase so "Admin" and "admin"
    // share the same bucket — otherwise an attacker rotating case
    // would dodge per-username throttling.
    expect(keys[1]).toBe("login-user:admin");
    expect(keys[2]).toBe("login-global");
  });

  it("rejects login when the per-username limit alone is hit (rotating-IPs attacker)", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    // First call (ip) passes, second (user) is over, third (global) passes.
    checkRateLimitMock
      .mockResolvedValueOnce({ limited: false, count: 1 })
      .mockResolvedValueOnce({ limited: true, count: 6 })
      .mockResolvedValueOnce({ limited: false, count: 5 });
    const r = await loginAction(fd({ username: "admin", password: "correct-horse" }));
    expect(r).toEqual({ ok: false, error: "Too many attempts. Try again later." });
    expect(findUserMock).not.toHaveBeenCalled();
    // Logger captures which limit tripped so we can tune thresholds
    // without leaking the answer to the attacker.
    const meta = loggerMock.warn.mock.calls.find((c) => c[1] === "login rate-limited")?.[0];
    expect(meta).toMatchObject({ limit: "username" });
  });

  it("rejects login when the global limit alone is hit (everyone-pile-on backstop)", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    checkRateLimitMock
      .mockResolvedValueOnce({ limited: false, count: 1 })
      .mockResolvedValueOnce({ limited: false, count: 1 })
      .mockResolvedValueOnce({ limited: true, count: 101 });
    const r = await loginAction(fd({ username: "admin", password: "correct-horse" }));
    expect(r).toEqual({ ok: false, error: "Too many attempts. Try again later." });
    const meta = loggerMock.warn.mock.calls.find((c) => c[1] === "login rate-limited")?.[0];
    expect(meta).toMatchObject({ limit: "global" });
  });

  it("rejects a cross-origin POST before checking credentials", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    headerStore.set("origin", "https://attacker.example");
    headerStore.set("host", "wabot.04080616.xyz");
    const r = await loginAction(fd({ username: "admin", password: "correct-horse" }));
    expect(r).toEqual({ ok: false, error: "Cross-origin request blocked." });
    expect(checkRateLimitMock).not.toHaveBeenCalled();
    expect(findUserMock).not.toHaveBeenCalled();
  });

  it("accepts a same-origin POST (Origin host matches Host header)", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    headerStore.set("origin", "https://wabot.04080616.xyz");
    headerStore.set("host", "wabot.04080616.xyz");
    await loginAction(fd({ username: "admin", password: "correct-horse" })).catch(() => {});
    // Got past the origin check → DB lookup ran.
    expect(findUserMock).toHaveBeenCalled();
  });

  it("treats a missing Origin header as same-origin (legitimate native form POST)", async () => {
    // Browsers don't always send Origin (e.g. plain top-level form
    // submissions). Refusing those would brick login on some clients.
    findUserMock.mockResolvedValue(ADMIN_ROW);
    headerStore.delete("origin");
    headerStore.set("host", "wabot.04080616.xyz");
    await loginAction(fd({ username: "admin", password: "correct-horse" })).catch(() => {});
    expect(findUserMock).toHaveBeenCalled();
  });

  it("rejects when Origin is malformed (non-URL string)", async () => {
    findUserMock.mockResolvedValue(ADMIN_ROW);
    headerStore.set("origin", "not a url");
    headerStore.set("host", "wabot.04080616.xyz");
    const r = await loginAction(fd({ username: "admin", password: "correct-horse" }));
    expect(r).toEqual({ ok: false, error: "Cross-origin request blocked." });
  });

  it("still hits the DB and bcrypt on the unknown-user path so timing equivalence holds", async () => {
    findUserMock.mockResolvedValue(undefined);
    const cmpSpy = vi.spyOn(bcrypt, "compare");
    await loginAction(fd({ username: "ghost", password: "anything" }));
    // findFirst was called even though we know the user doesn't exist.
    expect(findUserMock).toHaveBeenCalledTimes(1);
    expect(cmpSpy).toHaveBeenCalled();
    cmpSpy.mockRestore();
  });
});