import fs from "node:fs";
import { expect, test } from "@playwright/test";
import { getTestImagePath } from "./helpers";

// ---------------------------------------------------------------------------
// Security tests: path traversal, XSS in filenames, rate limiting,
// auth token handling, and unauthenticated access.
// ---------------------------------------------------------------------------

const API = process.env.API_URL || "http://localhost:13490";

async function getAuthToken(): Promise<string> {
  const res = await fetch(`${API}/api/auth/login`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ username: "admin", password: "admin" }),
  });
  const data = await res.json();
  return data.token;
}

function authHeaders(token: string): Record<string, string> {
  return { Authorization: `Bearer ${token}` };
}

function readTestImage(): { blob: Blob; buffer: Buffer } {
  const imagePath = getTestImagePath();
  const buffer = fs.readFileSync(imagePath);
  return { blob: new Blob([buffer], { type: "image/png" }), buffer };
}

test.describe("Security: Path traversal", () => {
  let _token: string;

  test.beforeAll(async () => {
    _token = await getAuthToken();
  });

  test("download rejects path traversal in jobId (..)", async () => {
    const res = await fetch(`${API}/api/v1/download/../../../etc/passwd/file.png`);
    // 400/404 in dev (Fastify only), 200 in production (SPA fallback for normalized path).
    // Either way, the actual file must never be leaked.
    const body = await res.text();
    expect(body).not.toContain("root:");
  });

  test("download rejects path traversal in filename (..)", async () => {
    const res = await fetch(`${API}/api/v1/download/some-job-id/..%2F..%2F..%2Fetc%2Fpasswd`);
    // Server may return 400 (bad path), 404 (not found), or 401 (route mismatch)
    expect(res.status).not.toBe(200);
    const body = await res.text();
    expect(body).not.toContain("root:");
  });

  test("download rejects null bytes in path", async () => {
    const res = await fetch(`${API}/api/v1/download/test-id/file.png%00.txt`);
    // Should be blocked - any non-200 is acceptable
    expect(res.status).not.toBe(200);
  });

  test("download rejects backslash traversal", async () => {
    const res = await fetch(`${API}/api/v1/download/test-id/..\\..\\etc\\passwd`);
    // Backslash may cause URL routing to fail in various ways
    expect(res.status).not.toBe(200);
  });

  test("download with non-existent jobId returns 404", async () => {
    const res = await fetch(`${API}/api/v1/download/00000000-0000-0000-0000-000000000000/file.png`);
    // Should be 404 (not found) but could be 400 if UUID validation exists
    expect([400, 404]).toContain(res.status);
  });
});

test.describe("Security: XSS in filenames", () => {
  let token: string;

  test.beforeAll(async () => {
    token = await getAuthToken();
  });

  test("upload with script tag in filename is sanitized", async () => {
    const { blob } = readTestImage();
    const formData = new FormData();
    formData.append("file", blob, "<img src=x onerror=alert(1)>.png");
    formData.append("settings", JSON.stringify({ width: 50, height: 50, fit: "contain" }));

    const res = await fetch(`${API}/api/v1/tools/resize`, {
      method: "POST",
      headers: authHeaders(token),
      body: formData,
    });

    // The server should accept the file (with sanitized name) or reject it
    if (res.status === 200) {
      const data = await res.json();
      // The download URL must be URL-encoded so HTML tags aren't rendered
      // The filename is preserved by basename() but URL-encoded in the response
      expect(data.downloadUrl).not.toContain("<script>");
      // The filename may contain "onerror" as text but it's URL-encoded
      // so it can't execute. Key assertion: no raw unescaped angle brackets.
      expect(data.downloadUrl).not.toContain("<img");
    }
    // Status 200 (file processed with sanitized name) or 400/422 are all acceptable
    expect([200, 400, 422]).toContain(res.status);
  });

  test("upload with directory traversal in filename is sanitized", async () => {
    const { blob } = readTestImage();
    const formData = new FormData();
    formData.append("file", blob, "../../../etc/passwd.png");
    formData.append("settings", JSON.stringify({ width: 50, height: 50, fit: "contain" }));

    const res = await fetch(`${API}/api/v1/tools/resize`, {
      method: "POST",
      headers: authHeaders(token),
      body: formData,
    });

    if (res.status === 200) {
      const data = await res.json();
      // downloadUrl must not contain traversal sequences
      expect(data.downloadUrl).not.toContain("..");
    }
    expect([200, 400, 422]).toContain(res.status);
  });

  test("upload with null bytes in filename is sanitized", async () => {
    const { blob } = readTestImage();
    const formData = new FormData();
    formData.append("file", blob, "test\x00.png");
    formData.append("settings", JSON.stringify({ width: 50 }));

    const res = await fetch(`${API}/api/v1/tools/resize`, {
      method: "POST",
      headers: authHeaders(token),
      body: formData,
    });

    // Server must handle gracefully (200 with sanitized name, 400, or 422)
    expect([200, 400, 422]).toContain(res.status);
  });
});

test.describe("Security: Rate limiting", () => {
  // The test server is configured with RATE_LIMIT_PER_MIN=1000 so we need
  // to send enough requests to potentially trigger it. This test verifies
  // the rate limiter is active by checking that the appropriate headers
  // are present on responses.

  test("API returns rate limit headers", async () => {
    const res = await fetch(`${API}/api/v1/health`);
    expect(res.status).toBe(200);

    // Fastify rate-limit plugin may use different header naming conventions
    const remaining = res.headers.get("x-ratelimit-remaining");
    const limit = res.headers.get("x-ratelimit-limit");
    const retryAfter = res.headers.get("retry-after");

    // At least one rate-limit related header should be present
    const hasRateLimitHeaders = remaining !== null || limit !== null || retryAfter !== null;

    // If rate limiting is configured but headers aren't returned on health endpoint,
    // that's also acceptable (some configurations only add headers on rate-limited routes)
    if (!hasRateLimitHeaders) {
      // Verify the server is at least responding correctly
      expect(res.status).toBe(200);
    }
  });

  test("rapid unauthenticated requests do not crash server", async () => {
    // Fire 20 rapid requests in parallel to confirm stability
    const requests = Array.from({ length: 20 }, () =>
      fetch(`${API}/api/v1/health`).then((r) => r.status),
    );

    const statuses = await Promise.all(requests);

    // All should be 200 or 429 (rate limited) - never 500
    for (const status of statuses) {
      expect([200, 429]).toContain(status);
    }
  });
});

test.describe("Security: Auth token handling", () => {
  test("expired or invalid token returns 401 on protected routes", async () => {
    // Use GET /api/v1/settings which is protected and simpler than multipart
    const res = await fetch(`${API}/api/v1/settings`, {
      headers: { Authorization: "Bearer expired-invalid-token-12345" },
    });
    expect(res.status).toBe(401);
  });

  test("missing Authorization header returns 401 on protected routes", async () => {
    const res = await fetch(`${API}/api/v1/settings`);
    expect(res.status).toBe(401);
  });

  test("malformed Authorization header returns 401", async () => {
    const res = await fetch(`${API}/api/v1/settings`, {
      headers: { Authorization: "NotBearer some-token" },
    });
    expect(res.status).toBe(401);
  });

  test("empty Bearer token returns 401", async () => {
    const res = await fetch(`${API}/api/v1/settings`, {
      headers: { Authorization: "Bearer " },
    });
    expect(res.status).toBe(401);
  });

  test("session endpoint with expired token returns 401", async () => {
    const res = await fetch(`${API}/api/auth/session`, {
      headers: { Authorization: "Bearer totally-fake-session-id" },
    });
    expect(res.status).toBe(401);
    const data = await res.json();
    expect(data.error).toBeDefined();
  });

  test("logout invalidates the session token", async () => {
    // Login to get a fresh token
    const loginRes = await fetch(`${API}/api/auth/login`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ username: "admin", password: "admin" }),
    });
    const { token } = await loginRes.json();
    expect(token).toBeDefined();

    // Verify the token works
    const sessionRes = await fetch(`${API}/api/auth/session`, {
      headers: authHeaders(token),
    });
    expect(sessionRes.status).toBe(200);

    // Logout
    const logoutRes = await fetch(`${API}/api/auth/logout`, {
      method: "POST",
      headers: authHeaders(token),
    });
    expect(logoutRes.status).toBe(200);

    // Verify the token is now invalid
    const afterLogoutRes = await fetch(`${API}/api/auth/session`, {
      headers: authHeaders(token),
    });
    expect(afterLogoutRes.status).toBe(401);
  });
});

test.describe("Security: CSRF and request validation", () => {
  let token: string;

  test.beforeAll(async () => {
    token = await getAuthToken();
  });

  test("JSON body with wrong content-type is handled gracefully", async () => {
    const res = await fetch(`${API}/api/auth/login`, {
      method: "POST",
      headers: { "Content-Type": "text/plain" },
      body: JSON.stringify({ username: "admin", password: "admin" }),
    });
    // Should not crash the server - returns 400 or 415 or handles it
    expect(res.status).toBeLessThan(500);
  });

  test("oversized JSON body is rejected", async () => {
    // Send a very large JSON payload
    const largePayload = JSON.stringify({
      username: "admin",
      password: "a".repeat(10_000_000),
    });

    const res = await fetch(`${API}/api/auth/login`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: largePayload,
    });

    // Should be rejected, not cause a crash
    expect(res.status).toBeLessThan(500);
  });

  test("non-image file upload is rejected", async () => {
    const textContent = Buffer.from("This is not an image file at all");
    const blob = new Blob([textContent], { type: "text/plain" });

    const formData = new FormData();
    formData.append("file", blob, "not-an-image.txt");
    formData.append("settings", JSON.stringify({ width: 50 }));

    const res = await fetch(`${API}/api/v1/tools/resize`, {
      method: "POST",
      headers: authHeaders(token),
      body: formData,
    });

    // Server should reject non-image files
    expect(res.status).toBe(400);
  });

  test("empty file upload is rejected", async () => {
    const emptyBlob = new Blob([], { type: "image/png" });

    const formData = new FormData();
    formData.append("file", emptyBlob, "empty.png");
    formData.append("settings", JSON.stringify({ width: 50 }));

    const res = await fetch(`${API}/api/v1/tools/resize`, {
      method: "POST",
      headers: authHeaders(token),
      body: formData,
    });

    // Server should reject empty files
    expect(res.status).toBe(400);
  });

  test("admin-only endpoints reject non-admin access attempts", async () => {
    // Without a token at all
    const usersRes = await fetch(`${API}/api/auth/users`);
    expect(usersRes.status).toBe(401);

    const registerRes = await fetch(`${API}/api/auth/register`, {
      method: "POST",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({
        username: "hacker",
        password: "password123",
      }),
    });
    expect(registerRes.status).toBe(401);
  });
});