// End-to-end check of Back and Forward navigation history, UI buttons, and mouse buttons 3 & 4.
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-nav-'));
const vault = path.join(tmp, 'Vault');
fs.mkdirSync(vault);
fs.writeFileSync(path.join(vault, 'Alpha.md'), 'Content of Alpha\n');
fs.writeFileSync(path.join(vault, 'Beta.md'), 'Content of Beta\n');
fs.writeFileSync(path.join(vault, 'Gamma.md'), 'Content of Gamma\n');

app.setPath('userData', tmp);
fs.writeFileSync(path.join(tmp, 'settings.json'), JSON.stringify({ vault, lastPage: 'Alpha', bounds: { width: 1280, height: 860 } }));
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} })()`);

  try {
    await sleep(2000);
    const title = () => js(`return document.querySelector('.title')?.textContent?.trim()`);
    const backDisabled = () => js(`return !!document.querySelector('.nav-btn[aria-label="Back"]')?.disabled`);
    const forwardDisabled = () => js(`return !!document.querySelector('.nav-btn[aria-label="Forward"]')?.disabled`);

    check('starts on Alpha', (await title()) === 'Alpha', await title());
    check('back is disabled initially', (await backDisabled()) === true);
    check('forward is disabled initially', (await forwardDisabled()) === true);

    // Navigate to Beta
    await js(`document.querySelector('.row[data-id="Beta"]')?.click()`);
    await sleep(600);
    check('navigates to Beta', (await title()) === 'Beta', await title());
    check('back is now enabled', (await backDisabled()) === false);
    check('forward remains disabled', (await forwardDisabled()) === true);

    // Navigate to Gamma
    await js(`document.querySelector('.row[data-id="Gamma"]')?.click()`);
    await sleep(600);
    check('navigates to Gamma', (await title()) === 'Gamma', await title());

    // Click Topbar Back button
    await js(`document.querySelector('.nav-btn[aria-label="Back"]')?.click()`);
    await sleep(600);
    check('topbar Back button goes to Beta', (await title()) === 'Beta', await title());
    check('forward is now enabled', (await forwardDisabled()) === false);

    // Mouse button 3 (Back)
    await js(`window.dispatchEvent(new MouseEvent('mouseup', { button: 3, bubbles: true, cancelable: true }))`);
    await sleep(600);
    check('mouse Back button (button 3) goes to Alpha', (await title()) === 'Alpha', await title());
    check('back is now disabled at start of history', (await backDisabled()) === true);
    check('forward is enabled', (await forwardDisabled()) === false);

    // Mouse button 4 (Forward)
    await js(`window.dispatchEvent(new MouseEvent('mouseup', { button: 4, bubbles: true, cancelable: true }))`);
    await sleep(600);
    check('mouse Forward button (button 4) goes to Beta', (await title()) === 'Beta', await title());

    // Topbar Forward button
    await js(`document.querySelector('.nav-btn[aria-label="Forward"]')?.click()`);
    await sleep(600);
    check('topbar Forward button goes to Gamma', (await title()) === 'Gamma', await title());
    check('forward is disabled at end of history', (await forwardDisabled()) === true);

    // Keyboard Alt+ArrowLeft
    await js(`window.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowLeft', altKey: true, bubbles: true }))`);
    await sleep(600);
    check('Alt+ArrowLeft goes back to Beta', (await title()) === 'Beta', await title());

    // Keyboard Alt+ArrowRight
    await js(`window.dispatchEvent(new KeyboardEvent('keydown', { key: 'ArrowRight', altKey: true, bubbles: true }))`);
    await sleep(600);
    check('Alt+ArrowRight goes forward to Gamma', (await title()) === 'Gamma', await title());

    // Electron app-command browser-backward
    win.emit('app-command', { preventDefault() {} }, 'browser-backward');
    await sleep(600);
    check('Electron app-command browser-backward goes to Beta', (await title()) === 'Beta', await title());

    // Electron app-command browser-forward
    win.emit('app-command', { preventDefault() {} }, 'browser-forward');
    await sleep(600);
    check('Electron app-command browser-forward goes to Gamma', (await title()) === 'Gamma', await title());

  } catch (err) {
    check('harness', false, err.stack);
  }

  fs.rmSync(tmp, { recursive: true, force: true });
  console.log(failures.length ? `\n${failures.length} check(s) failed` : '\nnavigation e2e passed!');
  app.exit(failures.length ? 1 : 0);
});