/**
 * @file desktop-env.test.js
 * @description Unit tests for the graphical-session variables forwarded into a
 * lane's tmux pane. Without them a `claude` started by the dashboard has no
 * DISPLAY/WAYLAND_DISPLAY at all and answers "no image found in clipboard" on
 * a paste, while the same CLI works in a normal terminal.
 * @author Nguyễn Ngọc Trí Vĩ <vinnt@smartgift.vn>
 */
const { describe, it, beforeEach, afterEach } = require("node:test");
const assert = require("node:assert/strict");
const { desktopEnv, FORWARDED, __setExecImpl } = require("../lib/desktop-env");

const saved = {};

describe("desktopEnv", () => {
  beforeEach(() => {
    for (const name of FORWARDED) {
      saved[name] = process.env[name];
      delete process.env[name];
    }
  });
  afterEach(() => {
    for (const name of FORWARDED) {
      if (saved[name] === undefined) delete process.env[name];
      else process.env[name] = saved[name];
    }
  });

  it("reads the systemd user manager's environment", () => {
    __setExecImpl(
      () => "XDG_RUNTIME_DIR=/run/user/1001\nDISPLAY=:0\nXAUTHORITY=/run/user/1001/gdm/Xauthority\n"
    );
    assert.deepEqual(desktopEnv(), {
      DISPLAY: ":0",
      XAUTHORITY: "/run/user/1001/gdm/Xauthority",
      XDG_RUNTIME_DIR: "/run/user/1001",
    });
  });

  it("prefers this process's own value — a checkout run from a terminal has the real one", () => {
    process.env.DISPLAY = ":1";
    __setExecImpl(() => "DISPLAY=:0\n");
    assert.equal(desktopEnv().DISPLAY, ":1");
  });

  it("forwards nothing when there is no systemd user manager (macOS, a container)", () => {
    __setExecImpl(() => {
      throw new Error("systemctl: not found");
    });
    assert.deepEqual(desktopEnv(), {});
  });

  it("forwards only the clipboard-related names, never the whole session", () => {
    __setExecImpl(() => "DISPLAY=:0\nSSH_AUTH_SOCK=/tmp/agent\nPATH=/usr/bin\n");
    assert.deepEqual(Object.keys(desktopEnv()), ["DISPLAY"]);
  });

  it("drops a value carrying a newline — it becomes a tmux -e argv", () => {
    __setExecImpl(() => "");
    process.env.WAYLAND_DISPLAY = "wayland-0\ninjected";
    assert.equal(desktopEnv().WAYLAND_DISPLAY, undefined);
  });
});