/**
 * E2E (docs/06 §12): practice against computer players from the UI.
 * 1) PC: 오목 상세 → [컴퓨터와 연습하기] → 대기실(컴퓨터 1) → 시작 → 컴퓨터가 여러 번 받아 둔다.
 * 2) 휴대폰: 원카드 연습 → [컴퓨터 넣기]로 2명, 하나 더 넣었다 빼기 → 시작 → 사람·컴퓨터가 여러 턴.
 * Run: E2E_PORT=4534 bun e2e/bots.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 ?? 4534);
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 status = (p: Page) => p.locator('.turn-status').innerText().catch(() => '');
const resultShown = async (p: Page) => (await p.getByRole('dialog', { name: '게임 결과' }).count()) > 0;

async function startPractice(p: Page, gameId: string, nick: string) {
  await p.goto(`${ORIGIN}/g/${gameId}`);
  await p.getByRole('button', { name: '🤖 컴퓨터와 연습하기' }).click();
  await p.getByLabel('내 이름(닉네임)').fill(nick);
  await p.getByRole('button', { name: '이 이름으로 시작하기' }).click();
  await p.waitForURL(/\/r\/\d{6}$/);
  await p.getByLabel('자리').getByText('컴퓨터 1').waitFor();
  await p.getByText('연습 게임이에요. 기록에는 남지 않아요.').first().waitFor();
}

// ---------------------------------------------------------------- omok (PC)
const PAD = 0.9; // board viewBox padding (coordinate labels)
async function stones(p: Page): Promise<Set<number>> {
  const pts = await p.locator('svg[role="grid"] circle[r="0.46"]').evaluateAll((els) =>
    els.filter((e) => e.closest('g')?.getAttribute('opacity') !== '0.55').map((e) => [Number(e.getAttribute('cx')), Number(e.getAttribute('cy'))]),
  );
  return new Set(pts.map(([x, y]) => y! * 15 + x!));
}
async function clickCell(p: Page, x: number, y: number) {
  const box = (await p.locator('svg[role="grid"]').boundingBox())!;
  const span = 14 + 2 * PAD;
  const px = box.x + ((x + PAD) / span) * box.width;
  const py = box.y + ((y + PAD) / span) * box.height;
  await p.mouse.move(px, py);
  await p.mouse.click(px, py);
}

try {
  const pc = await browser.newContext({ viewport: { width: 1440, height: 900 }, locale: 'ko-KR' });
  const phone = await browser.newContext({ viewport: { width: 390, height: 844 }, deviceScaleFactor: 2, isMobile: true, hasTouch: true, locale: 'ko-KR' });
  const a = await pc.newPage();
  const b = await phone.newPage();
  const errors: string[] = [];
  for (const p of [a, b]) p.on('pageerror', (e) => errors.push(e.message));

  await step('오목: 상세 → 컴퓨터와 연습하기 → 대기실', async () => {
    await startPractice(a, 'omok', '호랑이');
    await a.getByText('🤖 컴퓨터').first().waitFor();
    // The host is seated first, the computer next; no public toggle in a practice room.
    await a.getByText('컴퓨터가 있는 방은 친구만 들어와요.').waitFor();
    await a.screenshot({ path: join(SHOTS, 'bots-1-lobby-pc.png') });
  });

  await step('오목: 시작 → 컴퓨터가 5번 받아 둔다', async () => {
    await a.getByRole('button', { name: '▶ 게임 시작' }).click();
    await a.locator('svg[role="grid"]').waitFor();
    let answers = 0;
    // Cells around the centre, nearest first.
    const order = Array.from({ length: 225 }, (_, i) => i).sort((i, j) => Math.hypot((i % 15) - 7, Math.floor(i / 15) - 7) - Math.hypot((j % 15) - 7, Math.floor(j / 15) - 7));
    for (let turn = 0; turn < 8 && answers < 5; turn++) {
      await a.waitForFunction(() => /내 차례예요|게임이 끝|이겼|졌/.test(document.querySelector('.turn-status')?.textContent ?? ''), null, { timeout: 8000 });
      if (await resultShown(a)) break;
      const before = await stones(a);
      const cell = order.find((i) => !before.has(i) && (i % 15) % 2 === turn % 2)!;
      await clickCell(a, cell % 15, Math.floor(cell / 15));
      // Our stone, then the computer's answer (it thinks ~1 s).
      await a.waitForFunction((n) => document.querySelectorAll('svg[role="grid"] g:not([opacity="0.55"]) > circle[r="0.46"]').length >= n + 2 || !!document.querySelector('[role="dialog"]'), before.size, { timeout: 8000 });
      if (await resultShown(a)) break;
      answers++;
      if (answers === 2) await a.screenshot({ path: join(SHOTS, 'bots-2-omok-pc.png') });
    }
    if (answers < 3) throw new Error(`the computer answered only ${answers} times`);
    console.log(`  omok: computer answered ${answers} times`);
  });

  // ---------------------------------------------------------------- one-card (phone)
  await step('원카드: 연습 방 → 컴퓨터 넣기·빼기 → 3명', async () => {
    await startPractice(b, 'one-card', '고양이');
    const seats = b.getByLabel('자리');
    await seats.getByRole('button', { name: '🤖 컴퓨터 넣기' }).click();
    await seats.getByText('컴퓨터 2').waitFor();
    await seats.getByRole('button', { name: '🤖 컴퓨터 넣기' }).click();
    await seats.getByText('컴퓨터 3').waitFor();
    await seats.getByRole('button', { name: '컴퓨터 3 빼기' }).click();
    await seats.getByText('컴퓨터 3').waitFor({ state: 'detached' });
    await b.screenshot({ path: join(SHOTS, 'bots-3-lobby-phone.png'), fullPage: true });
  });

  await step('원카드: 시작 → 내 차례 4번, 컴퓨터도 둔다', async () => {
    await b.getByRole('button', { name: '▶ 게임 시작' }).click();
    await b.locator('.turn-status').waitFor();
    let mine = 0;
    let botTurns = 0;
    let last = '';
    for (let t = 0; t < 400 && mine < 4; t++) {
      if (await resultShown(b)) break;
      const one = b.locator('.oc-onebtn');
      if ((await one.count()) && (await one.isEnabled().catch(() => false))) await one.click({ timeout: 1000 }).catch(() => {});
      const s = await status(b);
      if (s !== last && /컴퓨터 \d님 차례예요/.test(s)) botTurns++;
      last = s;
      if (!s.startsWith('내 차례예요')) {
        const next = b.getByRole('button', { name: /다음 판/ });
        if (await next.count()) await next.first().click().catch(() => {});
        await b.waitForTimeout(150);
        continue;
      }
      const accept = b.getByRole('button', { name: /^받아들이기/ });
      const card = b.locator('button.oc-card[data-legal="true"]').first();
      if (await accept.count()) await accept.click();
      else if (await card.count()) {
        await card.click();
        await card.click();
        const pick = b.locator('.oc-pick button').first();
        if (await pick.waitFor({ timeout: 400 }).then(() => true, () => false)) await pick.click();
      } else {
        const pass = b.getByRole('button', { name: '넘기기' });
        if (await pass.count()) await pass.click();
        else await b.getByRole('button', { name: /장 먹기$/ }).first().click();
      }
      await b.waitForFunction((x) => document.querySelector('.turn-status')?.textContent?.trim() !== x, s.trim(), { timeout: 8000 });
      mine++;
      if (mine === 2) await b.screenshot({ path: join(SHOTS, 'bots-4-one-card-phone.png') });
    }
    if (mine < 4 && !(await resultShown(b))) throw new Error(`only ${mine} of my turns were played`);
    if (botTurns < 2) throw new Error(`computers took only ${botTurns} turns`);
    console.log(`  one-card: my turns ${mine}, computer turns seen ${botTurns}`);
  });

  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);