// Enter sends, or makes a newline, and the person decides. Two rules hold
// whatever they choose: Shift+Enter is always a newline, Ctrl/Cmd+Enter always
// sends. Those are the habits people arrive with.
const test = require('node:test');
const assert = require('node:assert/strict');
const fs = require('node:fs');
const path = require('node:path');

const src = fs.readFileSync(path.join(__dirname, '..', 'public/js/clinicalAssistant.js'), 'utf8');
const handler = src.slice(src.indexOf("input.addEventListener('keydown'"), src.indexOf('var enterToggle'));

test('Ctrl or Cmd + Enter always sends, whatever the preference', () => {
  assert.match(handler, /if \(\(e\.ctrlKey \|\| e\.metaKey\)\) \{ e\.preventDefault\(\); onAsk\(e\); return; \}/);
  // It is checked before the preference, so it cannot be switched off.
  assert.ok(handler.indexOf('ctrlKey') < handler.indexOf('enterSends()'),
    'the modifier must win over the preference');
});

test('Shift+Enter is always a newline, whatever the preference', () => {
  assert.match(handler, /if \(e\.shiftKey \|\| e\.altKey\) return;/);
  assert.ok(handler.indexOf('shiftKey') < handler.indexOf('enterSends()'));
});

test('an IME composition keystroke never sends', () => {
  // Enter accepts a candidate word in Chinese, Japanese, Korean and on
  // predictive Android keyboards. Sending there cuts a sentence mid-word.
  assert.match(handler, /if \(e\.isComposing \|\| e\.keyCode === 229\) return;/);
  assert.ok(handler.indexOf('isComposing') < handler.indexOf('ctrlKey'),
    'composition is checked before anything can send');
});

test('the preference is per device, and survives storage being unavailable', () => {
  const pref = src.slice(src.indexOf('function enterSends()'), src.indexOf('function applyEnterHint'));
  assert.match(pref, /localStorage\.getItem\(ENTER_KEY\)/);
  assert.match(pref, /catch \(e\)/, 'a private window must not throw here');
  // Unset defaults by device class rather than guessing one answer for both.
  assert.match(pref, /\(hover: none\) and \(pointer: coarse\)/);
});

test('the toggle reflects and writes the preference', () => {
  const bind = src.slice(src.indexOf('var enterToggle'), src.indexOf('bindExampleButtons'));
  assert.match(bind, /enterToggle\.checked = enterSends\(\)/, 'opens showing the current state');
  assert.match(bind, /setEnterSends\(enterToggle\.checked\)/);
  const html = fs.readFileSync(path.join(__dirname, '..', 'public/components/assistant.html'), 'utf8');
  assert.match(html, /id="assistant-enter-sends"/);
});

test('the composer says which key sends', () => {
  assert.match(src, /Enter sends · Shift\+Enter for a new line/);
  assert.match(src, /Enter for a new line · Ctrl\+Enter sends/);
});