/**
 * M2 smoke E2E for every 2-player game (docs/10 §2): PC host creates the room from the game page,
 * a phone friend joins by link, host starts, both see the board, a few legal moves are played via
 * the keyboard (role="grid" boards support arrows + Enter) and reach the opponent.
 * Run: bun e2e/games.e2e.ts [gameId...]   (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 ?? 4519);
const ORIGIN = `http://localhost:${PORT}`;
const SHOTS = process.env.E2E_SHOTS ?? join(import.meta.dir, '../test-results');
mkdirSync(SHOTS, { recursive: true });

/** Per game: key sequences on the grid, in turn order (first mover, second mover, ...). */
interface Plan {
  /** Total players including the host (default 2). Extra players join on phones. */
  players?: number;
  /** Host changes room options before starting (inline settings form on PC). */
  lobby?: (host: Page) => Promise<void>;
  /** Steps run before normal moves (e.g. janggi formation choice). */
  setup?: (host: Page, guest: Page) => Promise<void>;
  /** Board games: key sequences on the grid, in turn order. */
  moves?: string[][];
  /** Card games: custom driver over all pages (host first). */
  drive?: (pages: Page[]) => Promise<void>;
}

/** Card games: whoever has the turn presses the first available safe action (check/call/…) until `rounds` actions were taken. */
async function pressActions(pages: Page[], labels: RegExp, rounds: number) {
  for (let n = 0; n < rounds; n++) {
    let done = false;
    for (let t = 0; t < 150 && !done; t++) {
      for (const p of pages) {
        const btn = p.getByRole('button', { name: labels }).first();
        if ((await btn.count()) && (await btn.isEnabled({ timeout: 200 }).catch(() => false))) {
          if (await btn.click({ timeout: 1000 }).then(() => true, () => false)) {
            done = true;
            break;
          }
        }
      }
      if (!done) await pages[0]!.waitForTimeout(100);
    }
    if (!done) throw new Error(`no action button matching ${labels} became available (step ${n + 1})`);
    await pages[0]!.waitForTimeout(150);
  }
}

/** Waits until every page shows the hand result, then presses "다음 판으로" where it is offered. */
async function finishHand(pages: Page[]) {
  for (const p of pages) await p.getByText('이번 판 결과').first().waitFor({ timeout: 10_000 });
}

/** 숫자 타일: whoever has the turn tries "도와줘" → "새 묶음" → "확정"; otherwise takes one tile. */
async function rummikubTurns(pages: Page[], turns: number) {
  const stats = { plays: 0, draws: 0, undo: false };
  const myTurn = (p: Page) => p.evaluate(() => !!document.querySelector('.turn-status')?.textContent?.includes('내 차례예요'));
  const bar = (p: Page) => p.getByRole('group', { name: '내 차례 행동' });
  /** Waits until a bar button is enabled / disabled (server answered). */
  const barButton = (p: Page, name: string, enabled: boolean) =>
    p.waitForFunction(
      ([n, e]) => [...document.querySelectorAll('.rk-bar button')].some((b) => b.textContent === n && b.hasAttribute('disabled') !== e),
      [name, enabled] as const,
      { timeout: 5000 },
    );
  for (let n = 0; n < turns; n++) {
    let mover: Page | null = null;
    for (let t = 0; t < 150 && !mover; t++) {
      for (const p of pages) if (!mover && (await myTurn(p))) mover = p;
      if (!mover) await pages[0]!.waitForTimeout(100);
    }
    if (!mover) throw new Error(`nobody has the turn (turn ${n + 1})`);
    await bar(mover).waitFor();
    let played = false;
    await bar(mover).getByRole('button', { name: '도와줘' }).click();
    const picked = await mover.locator('.rk-rack button[aria-pressed="true"]').count();
    if (picked > 0) {
      // Tap one picked tile twice (deselect, select again) — the tap-to-select path.
      const first = mover.locator('.rk-rack button[aria-pressed="true"]').first();
      const label = await first.getAttribute('aria-label');
      await first.click();
      await mover.locator(`.rk-rack button[aria-label="${label}"]`).first().click();
      await bar(mover).getByRole('button', { name: '새 묶음' }).click();
      await mover.locator('.rk-set').last().waitFor();
      if (!stats.undo) {
        // Undo once (back to the turn start), then place again.
        await barButton(mover, '되돌리기', true);
        await bar(mover).getByRole('button', { name: '되돌리기' }).click();
        await barButton(mover, '처음으로', false);
        stats.undo = true;
        await bar(mover).getByRole('button', { name: '도와줘' }).click();
        await bar(mover).getByRole('button', { name: '새 묶음' }).click();
      }
      const commit = bar(mover).getByRole('button', { name: '확정' });
      await mover
        .waitForFunction(() => [...document.querySelectorAll('.rk-bar button')].some((b) => b.textContent === '확정' && b.classList.contains('btn-primary') && !b.hasAttribute('disabled')), null, { timeout: 5000 })
        .then(
          () => (played = true),
          () => {},
        );
      if (played) {
        await commit.click();
        stats.plays++;
      } else {
        await bar(mover).getByRole('button', { name: '처음으로' }).click();
        await mover.waitForTimeout(300);
      }
    }
    if (!played) {
      await bar(mover).getByRole('button', { name: /^(한 장 가져오기|넘기기)$/ }).click();
      const sheet = mover.getByRole('button', { name: /^되돌리고/ });
      if (await sheet.count()) await sheet.click();
      stats.draws++;
    }
    await mover.waitForFunction(() => !document.querySelector('.turn-status')?.textContent?.includes('내 차례예요'), null, { timeout: 5000 });
  }
  console.log(`  rummikub: ${stats.plays} plays, ${stats.draws} draws, undo ${stats.undo ? 'used' : 'not used'}`);
  return stats;
}

const PLANS: Record<string, Plan> = {
  rummikub: {
    // PC host + phone guest, first meld "없음" so hint plays happen early; 10 real turns through the UI.
    lobby: async (host) => {
      await host.getByRole('group', { name: '첫 등록 최소 점수' }).getByRole('button', { name: '없음' }).click();
      await host.getByRole('button', { name: '설정 저장' }).click();
      await host.getByText('첫 등록 점수 없음').first().waitFor();
    },
    drive: async (pages) => {
      const stats = await rummikubTurns(pages, 10);
      if (stats.plays + stats.draws < 10) throw new Error('not enough turns');
    },
  },
  seotda: {
    // 3 players, default 2장 섯다 (1장씩 두 번): everyone checks both betting rounds → showdown.
    players: 3,
    drive: async (pages) => {
      await pressActions(pages, /^(체크|콜)/, 6);
      await finishHand(pages);
    },
  },
  poker: {
    // 3 players, default 7포커: 초이스 (discard 1st card, open 2nd), then everyone checks 4 streets → showdown.
    players: 3,
    drive: async (pages) => {
      for (const p of pages) {
        const cards = p.locator('.pk-mine button');
        await cards.first().waitFor();
        await cards.nth(0).click();
        await cards.nth(1).click();
        await p.getByRole('button', { name: '확인', exact: true }).click();
      }
      await pressActions(pages, /^체크/, 12);
      await finishHand(pages);
    },
  },
  othello: {
    // cursor starts at d4 (3,3): black d3 = up; then white c3 = up, left
    moves: [['ArrowUp', 'Enter'], ['ArrowUp', 'ArrowLeft', 'Enter']],
  },
  chess: {
    // cursor starts on the e-file pawn of whoever is at the bottom: white e2-e4, black d7-d5 (board flipped)
    moves: [['Enter', 'ArrowUp', 'ArrowUp', 'Enter'], ['Enter', 'ArrowUp', 'ArrowUp', 'Enter']],
  },
  baduk: {
    // cursor starts at 천원: black plays there, white plays one point to the left
    moves: [['Enter'], ['ArrowLeft', 'Enter']],
  },
  janggi: {
    // Both sides pick 안상차림 (order may be han-first), then each pushes the centre 졸 one step.
    setup: async (host, guest) => {
      for (let round = 0; round < 20; round++) {
        let picked = false;
        for (const p of [host, guest]) {
          const btn = p.getByRole('button', { name: /^안상차림/ });
          // The card list disappears right after choosing, so every probe must be short and tolerant.
          if ((await btn.count()) && (await btn.isEnabled({ timeout: 500 }).catch(() => false))) {
            picked = await btn
              .click({ timeout: 1000 })
              .then(() => true)
              .catch(() => false);
          }
        }
        if (await host.evaluate(() => !document.body.innerText.includes('상차림을 골라'))) {
          if (await guest.evaluate(() => !document.body.innerText.includes('상차림을 골라'))) return;
        }
        if (!picked) await host.waitForTimeout(200);
      }
      throw new Error('상차림 단계가 끝나지 않음');
    },
    moves: [
      ['ArrowUp', 'ArrowUp', 'Enter', 'ArrowUp', 'Enter'],
      ['ArrowUp', 'ArrowUp', 'Enter', 'ArrowUp', 'Enter'],
    ],
  },
};

const games = process.argv.slice(2).length ? process.argv.slice(2) : Object.keys(PLANS);
const app = startServer({
  config: loadConfig({ PORT: String(PORT), DB_PATH: join(mkdtempSync(join(process.env.TMPDIR ?? '/tmp', 'bg-e2e-')), '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;

async function keys(page: Page, seq: string[]) {
  await page.locator('[role="grid"]').first().focus();
  for (const k of seq) await page.keyboard.press(k);
}

for (const id of games) {
  const plan = PLANS[id];
  if (!plan) {
    console.log(`✗ ${id}: no plan`);
    failed = true;
    continue;
  }
  const errors: string[] = [];
  const host = await (await browser.newContext({ viewport: { width: 1440, height: 900 }, locale: 'ko-KR' })).newPage();
  const guests: Page[] = [];
  for (let g = 1; g < (plan.players ?? 2); g++) {
    guests.push(await (await browser.newContext({ viewport: { width: 390, height: 844 }, isMobile: true, hasTouch: true, locale: 'ko-KR' })).newPage());
  }
  const guest = guests[0]!;
  for (const p of [host, ...guests]) p.on('pageerror', (e) => errors.push(`${id}: ${e.message}`));
  try {
    await host.goto(`${ORIGIN}/g/${id}`);
    await host.getByRole('button', { name: /친구랑 하기/ }).click();
    await host.getByLabel('내 이름(닉네임)').fill('방장');
    await host.getByRole('button', { name: '이 이름으로 시작하기' }).click();
    await host.waitForURL(/\/r\/\d{6}$/);
    const code = host.url().slice(-6);
    for (const [gi, g] of guests.entries()) {
      const nick = gi === 0 ? '친구' : `친구${gi + 1}`;
      await g.goto(`${ORIGIN}/r/${code}`);
      await g.getByLabel('내 이름(닉네임)').fill(nick);
      await g.getByRole('button', { name: '이 이름으로 입장하기' }).click();
      await host.getByLabel('자리').getByText(nick, { exact: true }).waitFor();
    }
    if (plan.lobby) await plan.lobby(host);
    await host.screenshot({ path: join(SHOTS, `${id}-0-lobby.png`) });
    await host.getByRole('button', { name: '▶ 게임 시작' }).click();
    await host.getByRole('button', { name: '시작하기' }).click();
    if (plan.drive) {
      await host.locator('.turn-status').waitFor();
      await plan.drive([host, ...guests]);
    } else {
      await host.locator('[role="grid"]').first().waitFor();
      await guest.locator('[role="grid"]').first().waitFor();
    }
    if (plan.setup) await plan.setup(host, guest);
    const status = async (p: Page) => (await p.locator('.turn-status').innerText()).trim();
    // Sides may be random: whoever shows "내 차례예요" plays the next sequence.
    const myTurn = (p: Page) => p.evaluate(() => !!document.querySelector('.turn-status')?.textContent?.includes('내 차례예요'));
    for (const seq of plan.moves ?? []) {
      let mover: Page | null = null;
      for (let t = 0; t < 100 && !mover; t++) {
        if (await myTurn(host)) mover = host;
        else if (await myTurn(guest)) mover = guest;
        else await host.waitForTimeout(100);
      }
      if (!mover) throw new Error('nobody has the turn');
      await keys(mover, seq);
      await mover.waitForFunction(() => !document.querySelector('.turn-status')?.textContent?.includes('내 차례예요'), null, { timeout: 5000 });
    }
    await host.screenshot({ path: join(SHOTS, `${id}-1-game-pc.png`) });
    await guest.screenshot({ path: join(SHOTS, `${id}-2-game-phone.png`) });
    if (errors.length) throw new Error(errors.join(' | '));
    console.log(`✓ ${id} (host: ${await status(host)})`);
  } catch (e) {
    failed = true;
    console.log(`✗ ${id}: ${(e as Error).message.split('\n')[0]}`);
    await host.screenshot({ path: join(SHOTS, `${id}-fail-host.png`) }).catch(() => {});
    await guest.screenshot({ path: join(SHOTS, `${id}-fail-guest.png`) }).catch(() => {});
  }
}
await browser.close();
await app.stop();
console.log(failed ? 'E2E FAILED' : 'E2E PASSED');
process.exit(failed ? 1 : 0);