// Integration test for POST /api/admin/upload + GET /uploads/* (dev-plan.md
// T2 acceptance criteria). Spawns server.js as a child process on a throwaway
// port so this never touches the real pm2-managed instance/port (8934) or
// its library.json.
const test = require("node:test");
const assert = require("node:assert/strict");
const fs = require("node:fs");
const path = require("node:path");
const { spawn } = require("node:child_process");
const http = require("node:http");

// A real, valid 2x2 PNG (not just the 8-byte magic signature) — needed
// because sips has to actually decode it during stripMetadataAndSave.
const TINY_VALID_PNG = Buffer.from(
  "iVBORw0KGgoAAAANSUhEUgAAAAIAAAACCAIAAAD91JpzAAAAEklEQVR4nGPkEpFjYGBgYgADAALmAEAUQs4PAAAAAElFTkSuQmCC",
  "base64"
);

const PORT = 18934 + Math.floor(Math.random() * 1000);
const BASE = `http://localhost:${PORT}`;

function waitForServer(url, timeoutMs = 10000) {
  const deadline = Date.now() + timeoutMs;
  return (async function poll() {
    while (Date.now() < deadline) {
      try {
        await fetch(url);
        return;
      } catch {
        await new Promise((r) => setTimeout(r, 100));
      }
    }
    throw new Error("server did not come up in time");
  })();
}

let child;
test.before(async () => {
  child = spawn(process.execPath, ["server.js"], {
    cwd: __dirname,
    // H3_CONSOLE_BASE cleared: this test only exercises the upload route,
    // no need for the spawned copy to also hit the real H3 Console /
    // race the live pm2 instance on library.json's periodic sync.
    env: { ...process.env, PORT: String(PORT), H3_CONSOLE_BASE: "", H3_CONSOLE_TOKEN: "" },
    stdio: "pipe",
  });
  await waitForServer(BASE);
});

test.after(() => {
  child.kill();
  // uploads/ written by this test run lands under the real repo path
  // (server.js resolves it relative to __dirname, not PORT) — clean it up.
  const dir = path.join(__dirname, "uploads");
  fs.rmSync(dir, { recursive: true, force: true });
});

test("uploading a real PNG returns a URL that GET /uploads/* serves back with the right content-type", async () => {
  const fd = new FormData();
  fd.append("file", new Blob([TINY_VALID_PNG], { type: "image/png" }), "photo.png");

  const uploadRes = await fetch(`${BASE}/api/admin/upload`, { method: "POST", body: fd });
  assert.equal(uploadRes.status, 200);
  const { url } = await uploadRes.json();
  assert.match(url, /^\/uploads\/\d{6}\/[0-9a-f-]+\.png$/);

  const fetched = await fetch(`${BASE}${url}`);
  assert.equal(fetched.status, 200);
  assert.equal(fetched.headers.get("content-type"), "image/png");
});

test("a zip disguised as .jpg is rejected regardless of filename/content-type claimed by the client", async () => {
  const zipMagic = Buffer.from([0x50, 0x4b, 0x03, 0x04, 0, 0, 0, 0, 0, 0]);
  const fd = new FormData();
  fd.append("file", new Blob([zipMagic], { type: "image/jpeg" }), "totally-a-photo.jpg");

  const res = await fetch(`${BASE}/api/admin/upload`, { method: "POST", body: fd });
  assert.equal(res.status, 400);
});

test("a file over 8MB is rejected", async () => {
  const oversized = Buffer.alloc(8 * 1024 * 1024 + 1, 0);
  // still needs a real JPEG magic-byte prefix so this test isn't accidentally
  // passing for the wrong reason (magic-byte rejection instead of size).
  oversized[0] = 0xff;
  oversized[1] = 0xd8;
  oversized[2] = 0xff;
  const fd = new FormData();
  fd.append("file", new Blob([oversized], { type: "image/jpeg" }), "huge.jpg");

  await assert.rejects(
    () => fetch(`${BASE}/api/admin/upload`, { method: "POST", body: fd }),
    /fetch failed|ECONNRESET|terminated/i
  );
});

test("GET /uploads/* rejects path traversal", async () => {
  // fetch()/the URL parser normalize "../" out of the path before the
  // request ever leaves the client, which would silently defeat this test
  // (it'd request "/server.js", not exercise the /uploads/ handler at all).
  // A raw http.request with a hand-built request line preserves the literal
  // ".." so this actually exercises the guard in server.js.
  const status = await new Promise((resolve, reject) => {
    const req = http.request(
      { host: "localhost", port: PORT, path: "/uploads/../server.js", method: "GET" },
      (res) => resolve(res.statusCode)
    );
    req.on("error", reject);
    req.end();
  });
  assert.equal(status, 403);
});