// End-to-end check of edits made outside the app: they are never silently overwritten.
const { app, BrowserWindow } = require('electron');
const path = require('path');
const os = require('os');
const fs = require('fs');

const tmp = fs.mkdtempSync(path.join(os.tmpdir(), 'ink-e2e-conflict-'));
const vault = path.join(tmp, 'Vault');
fs.mkdirSync(vault);
fs.writeFileSync(path.join(vault, 'Note.md'), 'Original line.\n');
app.setPath('userData', tmp);
fs.writeFileSync(path.join(tmp, 'settings.json'), JSON.stringify({ vault, lastPage: 'Note', bounds: { width: 1200, height: 800 } }));
require('../electron/main.cjs');

const sleep = (ms) => new Promise((r) => setTimeout(r, ms));
const failures = [];
const check = (name, ok, extra = '') => {
  console.log(`${ok ? 'PASS' : 'FAIL'} ${name}${extra ? ' — ' + extra : ''}`);
  if (!ok) failures.push(name);
};

app.whenReady().then(async () => {
  let win;
  for (let i = 0; i < 80 && !(win = BrowserWindow.getAllWindows()[0]); i++) await sleep(100);
  const wc = win.webContents;
  if (wc.isLoading()) await new Promise((r) => wc.once('did-finish-load', r));
  const js = (code) => wc.executeJavaScript(`(async () => { ${code} })()`);
  const note = path.join(vault, 'Note.md');
  const versions = () => {
    const dir = path.join(vault, '.notes', 'history', 'Note');
    return fs.existsSync(dir) ? fs.readdirSync(dir).map((f) => fs.readFileSync(path.join(dir, f), 'utf8')) : [];
  };
  const toastText = () => js(`const t = document.querySelector('.toast'); return t && t.classList.contains('show') ? t.textContent : ''`);
  const typeAtEnd = async (text) => {
    await js(`const c = document.querySelector('.block .c'); c.focus(); const r = document.createRange(); r.selectNodeContents(c); r.collapse(false); const s = getSelection(); s.removeAllRanges(); s.addRange(r)`);
    await wc.insertText(text);
  };

  try {
    await sleep(1800);

    // an ordinary edit: no fuss
    await typeAtEnd(' One.');
    await sleep(1500);
    check('an ordinary edit saves with no warning', /Original line\. One\./.test(fs.readFileSync(note, 'utf8')) && !/outside Ink/.test(await toastText()), JSON.stringify(await toastText()));

    // changed on disk while this window has unsaved edits
    await typeAtEnd(' Mine.');
    fs.writeFileSync(note, 'Written by another editor.\n'); // within the save delay
    await sleep(2200);
    const now = fs.readFileSync(note, 'utf8');
    check('your edit is saved', /Mine\./.test(now), JSON.stringify(now));
    check('...the other version is kept in version history', versions().some((v) => /Written by another editor\./.test(v)), JSON.stringify(versions().map((v) => v.slice(0, 40))));
    check('...and you are told', /outside Ink/.test(await toastText()) && /Show versions/.test(await toastText()), JSON.stringify(await toastText()));
    await js(`document.querySelector('.toast .toast-btn').click()`);
    await sleep(700);
    check('"Show versions" opens the history', !!(await js(`return document.querySelector('[aria-label="Version history"], .panel')`)));
    await js(`window.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape' }))`);
    await sleep(400);

    // changed on disk with nothing unsaved: the window just follows
    fs.writeFileSync(note, 'Fresh from elsewhere.\n');
    await sleep(1800);
    check('with nothing unsaved the page follows the file', /Fresh from elsewhere/.test(await js(`return document.querySelector('.block .c')?.textContent || ''`)));
    await typeAtEnd(' Then me.');
    await sleep(1500);
    check('...and editing on from there raises no warning', /Fresh from elsewhere\. Then me\./.test(fs.readFileSync(note, 'utf8')) && !/outside Ink/.test(await toastText().then((t) => (/Updated from disk/.test(t) ? '' : t))), JSON.stringify(await toastText()));
  } catch (err) {
    check('harness', false, err.stack);
  }
  fs.rmSync(tmp, { recursive: true, force: true });
  console.log(failures.length ? `\n${failures.length} check(s) failed` : '\nconflict e2e passed!');
  app.exit(failures.length ? 1 : 0);
});