/**
 * E2E (docs/10 §2): guest start → create room → second user joins by link → omok to the end.
 * Run: bun e2e/omok.e2e.ts  (needs apps/web/dist built)
 */
import { chromium, type Page } from 'playwright-core';
import { mkdirSync, mkdtempSync } from 'node:fs';
import { join } from 'node:path';
import { loadConfig } from '../apps/server/src/config';
import { startServer } from '../apps/server/src/server';

const PORT = Number(process.env.E2E_PORT ?? 4517);
const ORIGIN = `http://localhost:${PORT}`;
const SHOTS = process.env.E2E_SHOTS ?? join(import.meta.dir, '../test-results');
mkdirSync(SHOTS, { recursive: true });

const dbDir = mkdtempSync(join(process.env.TMPDIR ?? '/tmp', 'bg-e2e-'));
const app = startServer({
  config: loadConfig({ PORT: String(PORT), DB_PATH: join(dbDir, 'app.db'), PUBLIC_ORIGIN: ORIGIN }),
  log: () => {},
  staticDir: join(import.meta.dir, '../apps/web/dist'),
});

const browser = await chromium.launch({ executablePath: process.env.CHROME ?? '/usr/bin/google-chrome', headless: true });
let failed = false;
const step = async (name: string, fn: () => Promise<void>) => {
  const t0 = performance.now();
  try {
    await fn();
    console.log(`✓ ${name} (${Math.round(performance.now() - t0)}ms)`);
  } catch (e) {
    failed = true;
    console.log(`✗ ${name}: ${(e as Error).message.split('\n')[0]}`);
    throw e;
  }
};

const PAD = 0.9; // board viewBox padding (coordinate labels)
async function cellPoint(page: Page, x: number, y: number, n = 15) {
  const box = (await page.locator('svg[role="grid"]').boundingBox())!;
  const span = n - 1 + 2 * PAD;
  return { px: box.x + ((x + PAD) / span) * box.width, py: box.y + ((y + PAD) / span) * box.height };
}
/** PC: one mouse click places. Phone: tap shows a preview, second tap confirms. */
async function tapCell(page: Page, x: number, y: number, touch: boolean) {
  const { px, py } = await cellPoint(page, x, y);
  if (touch) {
    await page.touchscreen.tap(px, py);
    await page.waitForTimeout(60);
    await page.touchscreen.tap(px, py);
  } else {
    await page.mouse.move(px, py);
    await page.mouse.click(px, py);
  }
}

try {
  // A = PC (primary target, docs/07 §3), B = phone.
  const ctxA = await browser.newContext({ viewport: { width: 1440, height: 900 }, locale: 'ko-KR' });
  const ctxB = await browser.newContext({ viewport: { width: 390, height: 844 }, deviceScaleFactor: 2, isMobile: true, hasTouch: true, locale: 'ko-KR' });
  const a = await ctxA.newPage();
  const b = await ctxB.newPage();
  const errors: string[] = [];
  for (const p of [a, b]) p.on('pageerror', (e) => errors.push(e.message));

  let code = '';
  await step('A: 홈 → 방 만들기 → 닉네임 → 대기실', async () => {
    await a.goto(ORIGIN + '/');
    await a.getByText('게임 고르기').waitFor();
    await a.screenshot({ path: join(SHOTS, '0-home-pc.png') });
    await a.getByRole('button', { name: '＋ 방 만들기' }).click();
    await a.getByRole('dialog', { name: '게임 고르기' }).getByRole('button', { name: /오목/ }).click();
    await a.getByLabel('내 이름(닉네임)').fill('호랑이');
    await a.getByRole('button', { name: '이 이름으로 시작하기' }).click();
    await a.waitForURL(/\/r\/\d{6}$/);
    code = a.url().slice(-6);
    await a.getByText('친구에게 이 코드를 알려 주세요').waitFor();
  });

  await step('B: 링크로 입장 → 닉네임 → 자동 착석', async () => {
    await b.goto(`${ORIGIN}/r/${code}`);
    await b.getByText('방에 초대받았어요').waitFor();
    await b.getByLabel('내 이름(닉네임)').fill('고양이');
    await b.getByRole('button', { name: '이 이름으로 입장하기' }).click();
    await b.getByLabel('자리').getByText('고양이').waitFor();
    await a.getByLabel('자리').getByText('고양이').waitFor();
    await b.screenshot({ path: join(SHOTS, '5-lobby-phone.png') });
  });

  await step('A: 설정(방장 흑, 자유룰) → 시작', async () => {
    // PC: the host edits settings inline in the lobby.
    await a.getByRole('button', { name: '자유룰' }).click();
    await a.getByRole('button', { name: '방장이 흑' }).click();
    await a.getByRole('button', { name: '설정 저장' }).click();
    await a.getByText('자유룰 · 15줄').waitFor();
    await a.screenshot({ path: join(SHOTS, '1-lobby-pc.png') });
    await a.getByRole('button', { name: '▶ 게임 시작' }).click();
    await a.getByRole('button', { name: '시작하기' }).click();
    await a.getByText('내 차례예요').waitFor();
    await b.getByText('호랑이님이 생각 중이에요').waitFor();
  });

  await step('대국: 흑 가로 5목', async () => {
    for (let i = 0; i < 4; i++) {
      await tapCell(a, 5 + i, 7, false);
      await b.getByText('내 차례예요').waitFor();
      await tapCell(b, 5 + i, 3, true);
      await a.getByText('내 차례예요').waitFor();
      if (i === 1) {
        await a.locator('input[aria-label="메시지"]').fill('잘 부탁해요!');
        await a.keyboard.press('Enter');
        await b.waitForTimeout(100);
        const { px, py } = await cellPoint(a, 7, 9);
        await a.mouse.move(px, py); // hover preview stone
        await a.screenshot({ path: join(SHOTS, '2-game-pc.png') });
        await b.screenshot({ path: join(SHOTS, '6-game-phone.png') });
      }
    }
  });

  await step('B: 새로고침해도 판이 그대로', async () => {
    await b.reload();
    await b.getByText('호랑이님이 생각 중이에요').waitFor();
    const stones = await b.locator('svg[role="grid"] circle[r="0.46"]').count();
    if (stones !== 8) throw new Error(`expected 8 stones after reload, got ${stones}`);
  });

  await step('흑 승리 → 결과 화면', async () => {
    await tapCell(a, 9, 7, false);
    await a.getByText('🎉 이겼어요!').waitFor();
    await b.getByText('아쉽게 졌어요').waitFor();
    await a.waitForTimeout(500); // let the sheet animation finish
    // Fairness check: the browser recomputes SHA-256(seed) and compares with the published hash.
    await a.getByText('공정성 확인').click();
    await a.getByRole('button', { name: '내 브라우저에서 직접 확인하기' }).click();
    await a.getByText('✓ 일치해요').waitFor();
    await a.screenshot({ path: join(SHOTS, '3-result-pc.png') });
    await b.screenshot({ path: join(SHOTS, '4-result-phone.png') });
  });

  await step('한 판 더 → 새 게임 시작', async () => {
    await a.getByRole('button', { name: /한 판 더/ }).click();
    await b.getByRole('button', { name: /한 판 더/ }).click();
    await a.getByText(/차례예요|생각 중이에요/).waitFor();
  });

  if (errors.length) throw new Error(`page errors: ${errors.join(' | ')}`);
} catch (e) {
  failed = true;
  console.error(e);
} finally {
  await browser.close();
  await app.stop();
}
console.log(failed ? 'E2E FAILED' : 'E2E PASSED');
process.exit(failed ? 1 : 0);