/**
 * @file Tests Quit AgentHub (issue #65, server/lib/quit.js and
 * POST /api/settings/quit): the stopped flag, stopping through the service
 * manager when a unit of ours runs the server (a SIGTERM would be restarted),
 * and the route killing every lane pane before it stops. tmux runs only in the
 * isolated server `npm run test:server` sets up.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */

const { describe, it, before, after } = require("node:test");
const assert = require("node:assert/strict");
const fs = require("node:fs");
const os = require("node:os");
const path = require("node:path");
const http = require("node:http");
const { execFileSync } = require("node:child_process");

const TMP = fs.mkdtempSync(path.join(os.tmpdir(), "agenthub-quit-"));
process.env.DASHBOARD_DATA_DIR = TMP;
process.env.DASHBOARD_DB_PATH = path.join(TMP, "dashboard.db");
process.env.DASHBOARD_LIVENESS_PROBE = "0";

const quit = require("../lib/quit");

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

describe("stopped flag", () => {
  it("is set by markQuit and cleared by clearQuit, in the data dir's runtime", () => {
    assert.equal(quit.flagPath(), path.join(TMP, "runtime", "stopped"));
    assert.equal(quit.isQuit(), false);
    quit.markQuit();
    assert.equal(quit.isQuit(), true);
    quit.clearQuit();
    assert.equal(quit.isQuit(), false);
    quit.clearQuit(); // already gone: fine
  });
});

describe("stopServer", () => {
  const fakeSvc = (kind, active) => ({
    kind,
    systemctlAvailable: () => true,
    unitIsOurs: () => true,
    unitIsActive: () => active,
  });
  const spawned = [];
  const spawn = (cmd, args) => {
    spawned.push([cmd, ...args].join(" "));
    return { unref() {} };
  };

  it("SIGTERMs itself when no unit of ours is running", () => {
    let killed = 0;
    quit.stopServer({ svc: fakeSvc("systemd", false), spawn, kill: () => killed++ });
    assert.equal(killed, 1);
    assert.deepEqual(spawned, []);
  });

  it("stops a running unit through systemd, never by a signal Restart=always undoes", () => {
    let killed = 0;
    quit.stopServer({ svc: fakeSvc("systemd", true), spawn, kill: () => killed++ });
    assert.equal(killed, 0);
    assert.deepEqual(spawned.splice(0), ["systemctl --user stop --no-block agenthub.service"]);
  });

  it("boots a running LaunchAgent out", { skip: process.platform === "win32" }, () => {
    quit.stopServer({ svc: fakeSvc("launchd", true), spawn, kill: () => {} });
    assert.match(spawned.splice(0)[0], /^launchctl bootout gui\/\d+\/io\.smartgift\.agenthub$/);
  });
});

// Only inside the runner's private tmux server: never the developer's own.
const isolatedTmux = !!process.env.TMUX_TMPDIR && !process.env.TMUX;
let hasTmux = false;
try {
  execFileSync("tmux", ["-V"], { stdio: "ignore" });
  hasTmux = true;
} catch {
  /* not installed */
}

describe(
  "POST /api/settings/quit",
  { skip: !(isolatedTmux && hasTmux) && "needs the runner's isolated tmux" },
  () => {
    let server;
    let base;
    let stops = 0;
    const realStop = quit.stopServer;

    before(async () => {
      quit.stopServer = () => stops++; // this process is the test runner
      const { createApp, startServer } = require("../index");
      server = await startServer(createApp(), 0);
      base = `http://127.0.0.1:${server.address().port}`;
    });

    after(() => {
      quit.stopServer = realStop;
      server?.close();
      require("../db").db.close();
    });

    it("closes every lane pane, sets the flag, then stops the server", async () => {
      execFileSync("tmux", ["new-session", "-d", "-s", "agenthub-lane-9001", "sleep 60"]);
      execFileSync("tmux", ["new-session", "-d", "-s", "agenthub-lane-9001-2", "sleep 60"]);
      execFileSync("tmux", ["new-session", "-d", "-s", "not-ours", "sleep 60"]);
      try {
        const body = await new Promise((resolve, reject) => {
          const req = http.request(`${base}/api/settings/quit`, { method: "POST" }, (res) => {
            let text = "";
            res.on("data", (c) => (text += c));
            res.on("end", () => resolve(JSON.parse(text)));
          });
          req.on("error", reject);
          req.end();
        });
        assert.deepEqual(body, { ok: true, killed: 2 });
        assert.equal(quit.isQuit(), true);
        const left = execFileSync("tmux", ["list-sessions", "-F", "#{session_name}"], {
          encoding: "utf8",
        });
        assert.deepEqual(left.trim().split("\n"), ["not-ours"]);
        await new Promise((r) => setImmediate(r));
        assert.equal(stops, 1);
      } finally {
        execFileSync("tmux", ["kill-session", "-t", "not-ours"]);
      }
    });
  }
);