/**
 * @file Tests GET/PUT /api/settings/codex-home and setCodexHome: the shared
 * home-dir guard, persistence to the settings file, the `env_owned` flag, and
 * a home change from another site refused. Everything lives in a temp dir.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const os = require("node:os");
const fs = require("node:fs");
const path = require("node:path");
const http = require("node:http");

const ROOT = fs.mkdtempSync(path.join(os.tmpdir(), "agenthub-codex-home-"));
process.env.CLAUDE_HOME = path.join(ROOT, ".claude");
process.env.CODEX_HOME = path.join(ROOT, "codex-a");
process.env.DASHBOARD_DB_PATH = path.join(ROOT, "dashboard.db");
process.env.AGENTHUB_SETTINGS_FILE = path.join(ROOT, "settings.env");
fs.mkdirSync(process.env.CODEX_HOME, { recursive: true });

const { describe, it, before, after } = require("node:test");
const assert = require("node:assert/strict");
const express = require("express");

const { envOwned } = require("../lib/settings-env");
const settingsRouter = require("../routes/settings");

let server;
let base;

function request(method, url, body, extra = {}) {
  return new Promise((resolve, reject) => {
    const data = body === undefined ? null : Buffer.from(JSON.stringify(body));
    const req = http.request(
      `${base}${url}`,
      {
        method,
        headers: {
          ...(data ? { "content-type": "application/json", "content-length": data.length } : {}),
          ...extra,
        },
      },
      (res) => {
        let text = "";
        res.on("data", (c) => (text += c));
        res.on("end", () => resolve({ status: res.statusCode, body: JSON.parse(text) }));
      }
    );
    req.on("error", reject);
    if (data) req.write(data);
    req.end();
  });
}

before(async () => {
  const app = express();
  app.use(express.json());
  app.use("/api/settings", settingsRouter);
  server = http.createServer(app);
  await new Promise((r) => server.listen(0, "127.0.0.1", r));
  base = `http://127.0.0.1:${server.address().port}`;
});

after(() => {
  server.close();
  fs.rmSync(ROOT, { recursive: true, force: true });
});

describe("/api/settings/codex-home", () => {
  it("GET answers the current home and whether the environment owns it", async () => {
    const res = await request("GET", "/api/settings/codex-home");
    assert.equal(res.status, 200);
    assert.equal(res.body.codex_home, process.env.CODEX_HOME);
    assert.equal(res.body.env_owned, envOwned.has("CODEX_HOME"));
  });

  it("refuses a path that contains the user's home, changing nothing", async () => {
    const before = process.env.CODEX_HOME;
    const res = await request("PUT", "/api/settings/codex-home", { path: "/" });
    assert.equal(res.status, 400);
    assert.equal(res.body.error.code, "EBADHOME");
    assert.equal(process.env.CODEX_HOME, before);
    assert.ok(!fs.existsSync(process.env.AGENTHUB_SETTINGS_FILE));
  });

  it("refuses a missing path and a non-string body", async () => {
    for (const body of [{ path: path.join(ROOT, "nope") }, { path: 7 }, {}]) {
      const res = await request("PUT", "/api/settings/codex-home", body);
      assert.equal(res.status, 400);
      assert.equal(res.body.error.code, "INVALID_PATH");
    }
  });

  it("switches and persists", async () => {
    const next = path.join(ROOT, "codex-b");
    fs.mkdirSync(next);
    const res = await request("PUT", "/api/settings/codex-home", { path: next });
    assert.equal(res.status, 200);
    assert.equal(res.body.codex_home, next);
    assert.equal(process.env.CODEX_HOME, next);
    assert.match(
      fs.readFileSync(process.env.AGENTHUB_SETTINGS_FILE, "utf8"),
      new RegExp(`^CODEX_HOME=${next}$`, "m")
    );
  });

  it("refuses a home change asked by another site", async () => {
    const next = path.join(ROOT, "codex-evil");
    fs.mkdirSync(next);
    const res = await request(
      "PUT",
      "/api/settings/codex-home",
      { path: next },
      { Origin: "https://evil.example" }
    );
    assert.equal(res.status, 403);
    assert.notEqual(process.env.CODEX_HOME, next);
  });
});