import assert from 'node:assert/strict';
import fs from 'node:fs';
import os from 'node:os';
import path from 'node:path';
import test from 'node:test';

import { readPresentationSettings, writePresentationSettings } from './appPreferences';

void test('appPreferences: presentation settings round-trip without clobbering eula', () => {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'dnd-prefs-'));
  const prefsPath = path.join(dir, 'preferences.json');
  fs.writeFileSync(prefsPath, `${JSON.stringify({ eulaAcceptedVersion: 2 }, null, 2)}\n`, 'utf8');

  writePresentationSettings(dir, { displayId: 42, fullScreen: false });
  const loaded = readPresentationSettings(dir);
  assert.equal(loaded.displayId, 42);
  assert.equal(loaded.fullScreen, false);

  const raw = JSON.parse(fs.readFileSync(prefsPath, 'utf8')) as {
    eulaAcceptedVersion?: number;
    presentation?: { displayId: number | null; fullScreen: boolean };
  };
  assert.equal(raw.eulaAcceptedVersion, 2);
  assert.equal(raw.presentation?.displayId, 42);
  assert.equal(raw.presentation?.fullScreen, false);
});

void test('appPreferences: defaults when preferences missing', () => {
  const dir = fs.mkdtempSync(path.join(os.tmpdir(), 'dnd-prefs-'));
  const loaded = readPresentationSettings(dir);
  assert.equal(loaded.displayId, null);
  assert.equal(loaded.fullScreen, true);
});