// fake-gitlab.mjs — minimal GitLab v4 API stand-in on an ephemeral port.
// Serves exactly the two endpoints the daemon calls (daemon/gitlab.go):
//   GET /api/v4/user      (PAT validation)
//   GET /api/v4/projects  (member projects listing)
// Projects are returned UNSORTED so the harness proves the daemon sorts by
// last_activity_at.

import * as http from "node:http";

export const GOOD_PAT = "glpat-e2e-0123456789abcdef";
const HTTP_OK = 200;
const HTTP_UNAUTHORIZED = 401;
const HTTP_NOT_FOUND = 404;

export function startFakeGitLab() {
  const seen = { userAuths: [], projectAuths: [] };
  const server = http.createServer((req, res) => {
    const auth = String(req.headers["private-token"] ?? "");
    const send = (code, obj) => {
      res.writeHead(code, { "Content-Type": "application/json" });
      res.end(JSON.stringify(obj));
    };
    if (req.url.startsWith("/api/v4/user")) {
      seen.userAuths.push(auth);
      return auth === GOOD_PAT
        ? send(HTTP_OK, { id: 1, username: "e2e-user", name: "E2E User" })
        : send(HTTP_UNAUTHORIZED, { message: "401 Unauthorized" });
    }
    if (req.url.startsWith("/api/v4/projects")) {
      seen.projectAuths.push(auth);
      if (auth !== GOOD_PAT) return send(HTTP_UNAUTHORIZED, { message: "401 Unauthorized" });
      const base = `http://127.0.0.1:${server.address().port}`;
      return send(HTTP_OK, [
        {
          path_with_namespace: "lvmh/beta",
          name: "beta",
          namespace: { path: "lvmh" },
          last_activity_at: "2025-07-01T10:00:00Z",
          web_url: `${base}/lvmh/beta`,
          default_branch: "main",
        },
        {
          path_with_namespace: "lvmh/alpha",
          name: "alpha",
          namespace: { path: "lvmh" },
          last_activity_at: "2025-08-01T10:00:00Z",
          web_url: `${base}/lvmh/alpha`,
          default_branch: "trunk",
        },
      ]);
    }
    return send(HTTP_NOT_FOUND, { message: "404 Not Found" });
  });
  return new Promise((resolve) => {
    server.listen(0, "127.0.0.1", () => {
      resolve({
        url: `http://127.0.0.1:${server.address().port}`,
        pat: GOOD_PAT,
        seen,
        close() {
          server.close();
        },
      });
    });
  });
}