/**
 * 마작 무작위 대국 ③ 3인(산마) 360판 + 엔진 randomPlayout(직렬화 왕복·정보 누출 검사 내장) + 매 단계 누출 검사
 * + 재현성 (docs/09-game-engine.md §7).
 */
import { describe, expect, test } from 'bun:test';
import { randomPlayout, seedN } from '@bg/engine';
import { mahjong } from './index';
import { checkPoints, checkTiles, emptyStats, playGame, variedOptions } from './playout';

const stats = emptyStats();

describe('무작위 대국: 3인 산마', () => {
  for (let chunk = 0; chunk < 18; chunk++) {
    test(`시드 ${2000 + chunk * 20 + 1}~${2000 + chunk * 20 + 20}`, () => {
      for (let i = 1; i <= 20; i++) {
        const seed = 2000 + chunk * 20 + i;
        playGame({ seed, players: 3, options: { length: seed % 2 ? 'tonpuu' : 'hanchan', ...variedOptions(seed, 3) }, prefs: seed % 4 === 0, leaveAt: seed % 11 === 0 ? 150 : undefined, stats });
      }
    });
  }
  test('북 뽑기·화료·유국이 모두 나왔다', () => {
    expect(stats.kita).toBeGreaterThan(500);
    expect(stats.tsumo).toBeGreaterThan(50);
    expect(stats.ron).toBeGreaterThan(50);
    expect(stats.exhaustive).toBeGreaterThan(50);
    expect(stats.maxApplyMs).toBeLessThan(25);
  });
});

describe('엔진 randomPlayout (매 단계 직렬화 왕복 + 정보 누출 검사)', () => {
  for (const [players, seed] of [
    [['A', 'B', 'C', 'D'], 1],
    [['A', 'B', 'C'], 2],
  ] as const) {
    test(`${players.length}인 동풍전 시드 ${seed}`, () => {
      const r = randomPlayout(mahjong, {
        players: [...players],
        options: mahjong.optionsSchema.parse({ length: 'tonpuu', westEntry: false }),
        seed: seedN(seed),
        maxSteps: 4000,
        maxApplyMs: 25,
        invariant: (s) => {
          checkTiles(s as never);
          checkPoints(s as never);
        },
      });
      expect(r.steps).toBeGreaterThan(100);
    });
  }
});

describe('매 단계 누출 검사 (울기·리치·화료가 있는 대국)', () => {
  test('4인 1판 + 3인 1판, 매 단계 모든 시점의 view 검사', () => {
    const a = emptyStats();
    playGame({ seed: 7, players: 4, options: { length: 'tonpuu', westEntry: false }, deep: true, stats: a });
    playGame({ seed: 8, players: 3, options: { length: 'tonpuu', westEntry: false }, deep: true, stats: a });
    expect(a.calls + a.riichi).toBeGreaterThan(0);
  });
});

describe('재현성', () => {
  test('같은 시드면 대국 전체가 같다', () => {
    for (const seed of [3, 4]) {
      const a = JSON.stringify(playGame({ seed, players: 4, options: variedOptions(seed, 4) }));
      const b = JSON.stringify(playGame({ seed, players: 4, options: variedOptions(seed, 4) }));
      expect(a).toBe(b);
    }
  });
});