#!/usr/bin/env node
/**
 * Headless end-to-end smoke test driven over the Chrome DevTools Protocol.
 * Usage: PATH=/opt/node22/bin:$PATH node tools/e2e.mjs <projectId> [baseUrl]
 * Writes screenshots to /tmp/gm-e2e-*.png and prints PASS/FAIL checks. No dependencies.
 *
 * Widgets are located through `window.__gm.locate(text)` (installed by the editor), so
 * the test does not depend on pixel coordinates.
 */
import { spawn } from 'node:child_process';
import { writeFileSync } from 'node:fs';

const projectId = process.argv[2];
const baseUrl = process.argv[3] ?? 'https://nockal.com/game-maker/';
if (!projectId) {
  console.error('usage: node tools/e2e.mjs <projectId> [baseUrl]');
  process.exit(2);
}
const PORT = 9333;
const W = 1280;
const H = 800;

const chrome = spawn('chromium', [
  '--headless', '--no-sandbox', '--disable-gpu', '--use-gl=swiftshader', '--enable-unsafe-swiftshader',
  `--remote-debugging-port=${PORT}`, `--window-size=${W},${H}`, '--hide-scrollbars', 'about:blank',
], { stdio: 'ignore' });

const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

async function waitForChrome() {
  for (let i = 0; i < 50; i++) {
    try {
      const res = await fetch(`http://127.0.0.1:${PORT}/json/version`);
      if (res.ok) return res.json();
    } catch {}
    await sleep(200);
  }
  throw new Error('chromium did not start');
}

class CDP {
  constructor(ws) {
    this.ws = ws;
    this.id = 0;
    this.pending = new Map();
    this.listeners = [];
    ws.addEventListener('message', (ev) => {
      const msg = JSON.parse(ev.data);
      if (msg.id && this.pending.has(msg.id)) {
        const { resolve, reject } = this.pending.get(msg.id);
        this.pending.delete(msg.id);
        msg.error ? reject(new Error(msg.error.message)) : resolve(msg.result);
      } else if (msg.method) {
        for (const l of this.listeners) l(msg);
      }
    });
  }
  send(method, params = {}) {
    const id = ++this.id;
    this.ws.send(JSON.stringify({ id, method, params }));
    return new Promise((resolve, reject) => this.pending.set(id, { resolve, reject }));
  }
  on(fn) { this.listeners.push(fn); }
}

const consoleLog = [];
let failures = 0;
function check(name, ok, detail = '') {
  console.log(`${ok ? 'PASS' : 'FAIL'}  ${name}${detail ? ' – ' + detail : ''}`);
  if (!ok) failures++;
}

try {
  await waitForChrome();
  const target = await (await fetch(`http://127.0.0.1:${PORT}/json/new?about:blank`, { method: 'PUT' })).json();
  const ws = new WebSocket(target.webSocketDebuggerUrl);
  await new Promise((r) => ws.addEventListener('open', r));
  const cdp = new CDP(ws);
  await cdp.send('Page.enable');
  await cdp.send('Runtime.enable');
  await cdp.send('Emulation.setDeviceMetricsOverride', { width: W, height: H, deviceScaleFactor: 1, mobile: false });
  cdp.on((msg) => {
    if (msg.method === 'Runtime.consoleAPICalled') consoleLog.push(msg.params.args.map((a) => a.value ?? a.description).join(' '));
    if (msg.method === 'Runtime.exceptionThrown') consoleLog.push('EXCEPTION ' + (msg.params.exceptionDetails.exception?.description ?? msg.params.exceptionDetails.text));
  });

  const evaluate = async (expression) => (await cdp.send('Runtime.evaluate', { expression, awaitPromise: true, returnByValue: true })).result.value;
  const locate = async (text) => {
    const p = await evaluate(`window.__gm && window.__gm.locate(${JSON.stringify(text)})`);
    if (!p) throw new Error(`widget with text "${text}" not found`);
    return p;
  };
  const shot = async (name) => {
    const { data } = await cdp.send('Page.captureScreenshot', { format: 'png' });
    writeFileSync(`/tmp/gm-e2e-${name}.png`, Buffer.from(data, 'base64'));
  };
  const mouse = (type, x, y, button = 'left', extra = {}) =>
    cdp.send('Input.dispatchMouseEvent', { type, x, y, button, clickCount: type === 'mousePressed' || type === 'mouseReleased' ? 1 : 0, ...extra });
  const click = async (x, y, button = 'left') => {
    await mouse('mouseMoved', x, y);
    await mouse('mousePressed', x, y, button);
    await mouse('mouseReleased', x, y, button);
    await sleep(150);
  };
  const clickText = async (text, button = 'left') => {
    const p = await locate(text);
    await click(p.x, p.y, button);
  };
  const drag = async (x1, y1, x2, y2, steps = 12) => {
    await mouse('mouseMoved', x1, y1);
    await mouse('mousePressed', x1, y1);
    for (let i = 1; i <= steps; i++) {
      await mouse('mouseMoved', x1 + ((x2 - x1) * i) / steps, y1 + ((y2 - y1) * i) / steps, 'left', { buttons: 1 });
      await sleep(16);
    }
    await mouse('mouseReleased', x2, y2);
    await sleep(150);
  };
  const keyPress = async (key, code, opts = {}) => {
    await cdp.send('Input.dispatchKeyEvent', { type: 'keyDown', key, code, ...opts });
    await cdp.send('Input.dispatchKeyEvent', { type: 'keyUp', key, code, ...opts });
  };
  const typeText = async (text) => {
    for (const ch of text) await cdp.send('Input.insertText', { text: ch });
  };
  const api = async (route) => (await fetch(`${baseUrl}api/index.php?r=${route}`)).json();
  const sceneOf = (doc) => doc.project.assets.find((a) => a.type === 'scene');
  const stateJson = () => evaluate('JSON.stringify({ selection: __gm.state.selection, mode: __gm.state.mode, save: __gm.state.saveStatus, notice: __gm.state.notice })');

  await cdp.send('Page.navigate', { url: `${baseUrl}?project=${projectId}` });
  await sleep(4000);
  await shot('01-loaded');
  check('page loaded without exceptions', !consoleLog.some((l) => l.startsWith('EXCEPTION')), consoleLog.filter((l) => l.startsWith('EXCEPTION')).join(' | '));
  check('debug hook present', Boolean(await evaluate('Boolean(window.__gm)')));

  // 1. Select the blue crate in the hierarchy.
  await clickText('Blue crate');
  let s = JSON.parse(await stateJson());
  check('hierarchy click selects object', s.selection?.kind === 'object' && s.selection.objectId === 'o2', JSON.stringify(s.selection));
  await shot('02-object-selected');

  // 2. Rename via inspector: the name field sits right of the "Name" label.
  const nameLabel = await locate('Name');
  await click(nameLabel.x + 160, nameLabel.y);
  await keyPress('a', 'KeyA', { modifiers: 2, windowsVirtualKeyCode: 65 }); // Ctrl+A in the bridge input
  await typeText('Renamed crate');
  await shot('03-typing');
  await keyPress('Enter', 'Enter', { windowsVirtualKeyCode: 13 });
  await sleep(200);
  s = JSON.parse(await stateJson());
  const nameNow = await evaluate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').name`);
  check('typing + Enter renamed the object', nameNow === 'Renamed crate', JSON.stringify(nameNow));
  await shot('04-renamed');

  // 3. Scrub the X field (right of the "X" label) by 100 px.
  const xLabel = await locate('X');
  await drag(xLabel.x + 160, xLabel.y, xLabel.x + 260, xLabel.y);
  const xNow = await evaluate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').position.x`);
  check('scrubbing X moved the object', xNow > 120, `x=${xNow}`);
  await shot('05-scrubbed');

  // 3b. Type into X, then click straight into the empty viewport: the typed value must be
  //     committed (not reverted) even though the click deselects and rebuilds the inspector.
  const center = await evaluate('__gm.viewportCenter()');
  await click(xLabel.x + 160, xLabel.y); // plain click → text editing with everything selected
  await typeText('300');
  await click(center.x, center.y + 250);
  const xTyped = await evaluate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').position.x`);
  s = JSON.parse(await stateJson());
  check('typed X survives clicking into the viewport', xTyped === 300 && s.selection === null, `x=${xTyped} selection=${JSON.stringify(s.selection)}`);

  // 4. Drag the red crate in the viewport. It is at world (-150,0); the view is centred
  //    on the origin, so compute its screen position from the viewport widget bounds.
  await drag(center.x - 150, center.y, center.x - 50, center.y - 70);
  const o1Now = await evaluate(`JSON.stringify(__gm.state.activeScene.objects.find(o => o.id === 'o1').position)`);
  check('viewport drag moved the red crate', JSON.parse(o1Now).x > -150, o1Now);
  await shot('06-dragged');

  // 5. Autosave → server.
  await sleep(1800);
  const saved = await api(`projects/${projectId}`);
  const renamed = sceneOf(saved).objects.find((o) => o.id === 'o2');
  check('rename persisted', renamed.name === 'Renamed crate', renamed.name);
  check('scrub persisted', renamed.position.x > 120, JSON.stringify(renamed.position));
  check('override kept', renamed.overrides.color === 4491519, JSON.stringify(renamed.overrides));
  check('save status is saved', (JSON.parse(await stateJson())).save === 'saved');

  // 6. Undo four times (drag, typed X, scrub, rename) with Ctrl+Z, then redo once.
  await click(center.x, center.y + 200); // click empty viewport → deselect, drop focus
  for (let i = 0; i < 4; i++) {
    await keyPress('z', 'KeyZ', { modifiers: 2, windowsVirtualKeyCode: 90 });
    await sleep(80);
  }
  const afterUndo = JSON.parse(await evaluate(`JSON.stringify(__gm.state.activeScene.objects.map(o => ({ id: o.id, name: o.name, x: o.position.x })))`));
  check('undo reverted drag, typed X, scrub and rename', afterUndo[0].x === -150 && afterUndo[1].x === 120 && afterUndo[1].name === 'Blue crate', JSON.stringify(afterUndo));
  await keyPress('z', 'KeyZ', { modifiers: 10, windowsVirtualKeyCode: 90 }); // Ctrl+Shift+Z
  const afterRedo = await evaluate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').name`);
  check('redo restored the rename', afterRedo === 'Renamed crate', afterRedo);
  await shot('07-undo-redo');

  // 7. Play: the camera frame is rendered (both crates lie inside the 640×360 frame at the
  //    origin), arrow keys do nothing, Esc stops without touching the model.
  await clickText('Renamed crate');
  const xBeforePlay = await evaluate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').position.x`);
  await clickText('▶  Play');
  await sleep(300);
  s = JSON.parse(await stateJson());
  check('play mode entered', s.mode === 'play', JSON.stringify(s));
  let info = await evaluate('JSON.stringify(__gm.viewportInfo())');
  check('play renders the camera frame with both crates', JSON.parse(info).rendering && JSON.parse(info).visibleItems === 2, info);
  await shot('08-playing');
  await cdp.send('Input.dispatchKeyEvent', { type: 'keyDown', key: 'ArrowRight', code: 'ArrowRight', windowsVirtualKeyCode: 39 });
  await sleep(300);
  await cdp.send('Input.dispatchKeyEvent', { type: 'keyUp', key: 'ArrowRight', code: 'ArrowRight', windowsVirtualKeyCode: 39 });
  await keyPress('Escape', 'Escape', { windowsVirtualKeyCode: 27 });
  await sleep(300);
  s = JSON.parse(await stateJson());
  check('escape stopped play', s.mode === 'edit', JSON.stringify(s));
  await shot('09-stopped');
  const o2AfterPlay = await evaluate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').position.x`);
  check('play did not write back to the model', o2AfterPlay === xBeforePlay, `${o2AfterPlay} vs ${xBeforePlay}`);

  // 7b. Culling: move the blue crate far outside the camera frame → only one item visible.
  await evaluate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').position.x = 5000; __gm.state.preview()`);
  await clickText('▶  Play');
  await sleep(300);
  info = await evaluate('JSON.stringify(__gm.viewportInfo())');
  check('objects outside the camera frame are culled', JSON.parse(info).visibleItems === 1, info);
  await keyPress('Escape', 'Escape', { windowsVirtualKeyCode: 27 });
  await sleep(200);
  await evaluate(`__gm.state.activeScene.objects.find(o => o.id === 'o2').position.x = ${xBeforePlay}; __gm.state.preview()`);

  // 7c. Without a camera nothing is rendered: delete the camera object, play, then undo.
  await evaluate(`__gm.state.select({ kind: 'object', sceneId: 'scene1', objectId: 'o3' })`);
  await keyPress('Delete', 'Delete', { windowsVirtualKeyCode: 46 });
  await sleep(200);
  check('camera object deleted', (await evaluate('__gm.state.activeScene.objects.length')) === 2);
  await clickText('▶  Play');
  await sleep(300);
  info = await evaluate('JSON.stringify(__gm.viewportInfo())');
  s = JSON.parse(await stateJson());
  check('play without camera renders nothing', s.mode === 'play' && !JSON.parse(info).rendering && JSON.parse(info).visibleItems === 0, info);
  check('play without camera shows a notice', s.notice.includes('no camera'), s.notice);
  await shot('10-play-no-camera');
  await keyPress('Escape', 'Escape', { windowsVirtualKeyCode: 27 });
  await sleep(300);
  await keyPress('z', 'KeyZ', { modifiers: 2, windowsVirtualKeyCode: 90 });
  await sleep(200);
  check('undo restored the camera object', (await evaluate('__gm.state.activeScene.objects.length')) === 3);

  // 8. Context menu on the Crate asset → menu shows "Place in scene".
  await clickText('Crate', 'right');
  await sleep(200);
  const menuVisible = await evaluate(`Boolean(__gm.locate('Place in scene'))`);
  check('asset context menu opens', menuVisible);
  await shot('11-context-menu');
  await clickText('Place in scene');
  await sleep(200);
  const count = await evaluate('__gm.state.activeScene.objects.length');
  check('placing from the menu adds an object', count === 4, `objects=${count}`);

  // 9. Create a new asset through the + menu.
  await clickText('+');
  await sleep(150);
  await clickText('Sprite');
  await sleep(200);
  const assets = await evaluate(`JSON.stringify(__gm.state.project.assets.map(a => a.name))`);
  check('+ menu creates a sprite asset', JSON.parse(assets).includes('Sprite'), assets);
  await shot('12-new-asset');

  // 10. Symbols stay on top: put the camera first in the hierarchy (drawn first) and a crate
  //     right on top of its icon → the icon must still be drawn above the sprite.
  await evaluate(`(() => {
    const objs = __gm.state.activeScene.objects;
    const cam = objs.splice(objs.findIndex(o => o.id === 'o3'), 1)[0];
    objs.unshift(cam);
    const crate = objs.find(o => o.id === 'o1');
    crate.position.x = 0; crate.position.y = 0;
    __gm.state.select(null);
    __gm.state.preview();
  })()`);
  await sleep(200);
  const layers = await evaluate(`JSON.stringify([__gm.layerOf('o3'), __gm.layerOf('o1'), __gm.layerOf('o2')])`);
  check('camera symbol is drawn in the overlay layer above sprites', layers === '["overlay","objects","objects"]', layers);
  await shot('13-symbol-on-top');

  // 11. Z-order: put both crates on the origin. With equal z the hierarchy order wins
  //     (o1 before o2 → o2 on top); raising o1's z draws it above o2; undo restores it.
  await evaluate(`(() => {
    const o2 = __gm.state.activeScene.objects.find(o => o.id === 'o2');
    o2.position.x = 0; o2.position.y = 0;
    __gm.state.preview();
  })()`);
  await sleep(200);
  const orderBefore = await evaluate(`JSON.stringify(__gm.drawOrder().filter(id => id === 'o1' || id === 'o2'))`);
  check('equal z keeps hierarchy order', orderBefore === '["o1","o2"]', orderBefore);
  await evaluate(`__gm.state.select({ kind: 'object', sceneId: __gm.state.activeScene.id, objectId: 'o1' })`);
  await sleep(200);
  const zLabel = await locate('Z');
  await click(zLabel.x + 160, zLabel.y); // plain click → text editing with everything selected
  await typeText('5');
  await keyPress('Enter', 'Enter', { windowsVirtualKeyCode: 13 });
  await sleep(200);
  const zNow = await evaluate(`__gm.state.activeScene.objects.find(o => o.id === 'o1').position.z`);
  check('Z field sets position.z', zNow === 5, `z=${zNow}`);
  const orderAfter = await evaluate(`JSON.stringify(__gm.drawOrder().filter(id => id === 'o1' || id === 'o2'))`);
  check('higher z is drawn on top', orderAfter === '["o2","o1"]', orderAfter);
  await shot('14-z-order');
  await keyPress('z', 'KeyZ', { modifiers: 2, windowsVirtualKeyCode: 90 });
  await sleep(200);
  const zUndone = await evaluate(`__gm.state.activeScene.objects.find(o => o.id === 'o1').position.z`);
  check('undo restores z', zUndone === 0, `z=${zUndone}`);

  // 12. Asset defaults: the Crate asset has height 60 (schema default 100), width and
  //     color at their defaults → exactly one reset button is visible. Clicking it puts
  //     height back to 100 and hides the button; undo brings 60 back.
  await evaluate(`__gm.state.select({ kind: 'asset', assetId: 'crate' })`);
  await sleep(200);
  const resetButton = await evaluate(`__gm.locate('↺')`);
  check('asset inspector shows a reset for the non-default height', Boolean(resetButton));
  await click(resetButton.x, resetButton.y);
  await sleep(200);
  const heightReset = await evaluate(`__gm.state.project.assets.find(a => a.id === 'crate').props.height`);
  check('reset puts the asset property back to its default', heightReset === 100, `height=${heightReset}`);
  check('reset button hidden once the value is at default', !(await evaluate(`__gm.locate('↺')`)));
  await shot('15-asset-reset');
  await keyPress('z', 'KeyZ', { modifiers: 2, windowsVirtualKeyCode: 90 });
  await sleep(200);
  const heightUndone = await evaluate(`__gm.state.project.assets.find(a => a.id === 'crate').props.height`);
  check('undo restores the asset value', heightUndone === 60, `height=${heightUndone}`);
  check('reset button visible again after undo', Boolean(await evaluate(`__gm.locate('↺')`)));

  check('no exceptions during run', !consoleLog.some((l) => l.startsWith('EXCEPTION')), consoleLog.filter((l) => l.startsWith('EXCEPTION')).slice(0, 3).join(' | '));
  ws.close();
} catch (error) {
  console.error(error);
  failures++;
} finally {
  chrome.kill('SIGTERM');
}
if (consoleLog.length) console.log('--- console ---\n' + consoleLog.slice(0, 20).join('\n'));
process.exit(failures ? 1 : 0);