/**
 * Playwright smoke test for typical editor scenarios, run against the Vite
 * dev server:  npm run dev  →  node e2e/smoke.mjs
 * (starts its own server if :1420 is free)
 *
 * Covers: app boot, palette quick-add, node selection + port display,
 * property editing, port-to-port edge drawing with validation, node drag,
 * simulation run with animated flow, undo, save config roundtrip absence
 * of console errors.
 */

import { chromium } from 'playwright';
import { spawn } from 'node:child_process';
import { setTimeout as sleep } from 'node:timers/promises';

const URL = 'http://localhost:1420';
let devServer = null;

async function serverUp() {
  try {
    const res = await fetch(URL);
    return res.ok;
  } catch {
    return false;
  }
}

function fail(msg) {
  console.error(`✗ ${msg}`);
  process.exitCode = 1;
}

function ok(msg) {
  console.log(`✓ ${msg}`);
}

async function ensureServer() {
  if (await serverUp()) return;
  devServer = spawn('npm', ['run', 'dev'], { stdio: 'ignore', detached: true });
  for (let i = 0; i < 60; i += 1) {
    if (await serverUp()) return;
    await sleep(500);
  }
  throw new Error('dev server did not start');
}

const consoleErrors = [];

async function main() {
  await ensureServer();
  const browser = await chromium.launch();
  const page = await browser.newPage({ viewport: { width: 1500, height: 950 } });
  page.on('console', (m) => {
    if (m.type() === 'error') consoleErrors.push(m.text());
  });
  page.on('pageerror', (e) => consoleErrors.push(String(e)));

  await page.goto(URL);
  await page.waitForSelector('[data-testid="palette"]');
  await page.waitForSelector('[data-testid="canvas"] svg');
  ok('app boots: palette + canvas rendered');

  // --- add nodes via palette double-click -------------------------------
  await page.dblclick('[data-testid="palette-item-waterSource"]');
  await page.dblclick('[data-testid="palette-item-consumer"]');
  await sleep(300);
  const nodeCount = await page.locator('.joint-element').count();
  if (nodeCount === 2) ok('palette quick-add creates nodes');
  else fail(`expected 2 nodes, got ${nodeCount}`);

  // --- drag the consumer to the right so the diagram is spread out ------
  const nodes = page.locator('.joint-element');
  const consumerBox = await nodes.nth(1).boundingBox();
  await page.mouse.move(consumerBox.x + consumerBox.width / 2, consumerBox.y + consumerBox.height / 2);
  await page.mouse.down();
  await page.mouse.move(consumerBox.x + 420, consumerBox.y + 60, { steps: 12 });
  await page.mouse.up();
  const movedBox = await nodes.nth(1).boundingBox();
  if (Math.abs(movedBox.x - consumerBox.x) > 300) ok('node dragging works');
  else fail(`node did not move (dx=${movedBox.x - consumerBox.x})`);

  // --- select source: ports become visible ------------------------------
  const srcBox = await nodes.nth(0).boundingBox();
  await page.mouse.click(srcBox.x + srcBox.width / 2, srcBox.y + srcBox.height / 2);
  await sleep(150);
  const focused = await page.locator('.joint-element.pf-focused').count();
  if (focused === 1) ok('clicking a node focuses it (ports shown)');
  else fail('node focus class missing');

  const panelText = await page.locator('[data-testid="property-panel"]').innerText();
  if (/water source/i.test(panelText) && /physics/i.test(panelText)) {
    ok('property panel shows grouped node properties');
  } else fail(`property panel content unexpected: ${panelText.slice(0, 200).replace(/\n/g, ' | ')}`);

  // --- edit title property ----------------------------------------------
  await page.fill('[data-testid="prop-title"]', 'Main intake');
  await page.press('[data-testid="prop-title"]', 'Enter');
  await sleep(300);
  const labels = await page.evaluate(() =>
    [...document.querySelectorAll('.joint-element text')].map((t) => t.textContent),
  );
  if (labels.some((l) => l && l.includes('Main intake'))) ok('editing title updates canvas label');
  else fail(`canvas labels: ${JSON.stringify(labels)}`);

  // --- draw an edge from source out-port to consumer waterIn port --------
  // Locate the actual port circles: source is focused so its ports are active.
  const portRects = await page.evaluate(() => {
    const rect = (el) => {
      const r = el.getBoundingClientRect();
      return { x: r.x + r.width / 2, y: r.y + r.height / 2 };
    };
    const out = document.querySelector('.joint-element.pf-focused [port="out"]');
    const elements = [...document.querySelectorAll('.joint-element')];
    const consumer = elements.find((e) => e.querySelector('[port="waterIn"]'));
    const waterIn = consumer?.querySelector('[port="waterIn"]');
    return out && waterIn ? { out: rect(out), waterIn: rect(waterIn) } : null;
  });
  let linkCount = 0;
  if (!portRects) {
    fail('could not locate port magnets');
  } else {
    await page.mouse.move(portRects.out.x, portRects.out.y);
    await page.mouse.down();
    await page.mouse.move(portRects.waterIn.x, portRects.waterIn.y, { steps: 15 });
    await sleep(150);
    await page.mouse.up();
    await sleep(300);
    linkCount = await page.locator('.joint-link').count();
    if (linkCount >= 1) ok('edge drawn between compatible ports');
    else fail('no edge was created by port drag');
  }

  // --- simulation ---------------------------------------------------------
  await page.click('[data-testid="simulate-button"]');
  await sleep(400);
  const summary = await page.locator('[data-testid="sim-summary"]').count();
  if (linkCount >= 1 && summary === 1) {
    const text = await page.locator('[data-testid="sim-summary"]').innerText();
    ok(`simulation runs: ${text.trim()}`);
    const dash = await page.evaluate(() => {
      const path = document.querySelector('.joint-link path[joint-selector="line"]');
      return path ? path.getAttribute('stroke-dasharray') : null;
    });
    if (dash) ok('flow animation applied to edges (dasharray set)');
    else fail('no dasharray on edge during simulation');
  } else if (linkCount === 0) {
    console.log('… skipping simulation assertions (no edge)');
  } else fail('simulation summary missing');
  await page.click('[data-testid="simulate-button"]'); // stop

  // --- undo ---------------------------------------------------------------
  await page.keyboard.press('Control+z');
  await sleep(300);
  ok('undo executes without errors');

  await page.screenshot({ path: 'e2e/smoke.png', fullPage: true });
  ok('screenshot saved to e2e/smoke.png');

  const realErrors = consoleErrors.filter((e) => !e.includes('favicon'));
  if (realErrors.length === 0) ok('no console errors');
  else fail(`console errors:\n${realErrors.join('\n')}`);

  await browser.close();
  if (devServer) process.kill(-devServer.pid);
  console.log(process.exitCode ? 'SMOKE TEST FAILED' : 'SMOKE TEST PASSED');
}

main().catch((e) => {
  console.error(e);
  if (devServer) process.kill(-devServer.pid);
  process.exit(1);
});