/**
 * hunt-balance-scan.mjs — 《围猎》bot 难度平衡扫描（开发工具，非断言测试）。
 *
 * 目的（23-hunt.md §3.4 / §15 裁决 10）：固定多种子仿真整局，校准 bot 强度口径——
 *   - 真人全程挂机（2 bot 独守）  → 大概率失守，或胜利但耐久仅 1-3（C）
 *   - 真人以 bot 水准游玩（3 bot 局）→ 余耐久 6-9（A/B）为主
 *
 * 场景：
 *   idle    真人不出手（挂机下限）
 *   bot     真人槽直接复用 room.botDecide（与 bot 完全同一决策管线 = "bot 水准"）
 *   optimal 真人最优策略（内圈即打、≥3 放旋风斩；人类上限参考）
 *
 * 运行：
 *   tools/node/bin/node web/server/test/hunt-balance-scan.mjs [种子数=24]
 *   tools/node/bin/node web/server/test/hunt-balance-scan.mjs grid [种子数=16]  # 参数网格扫描
 */

import { EventEmitter } from 'node:events';
import hunt from '../hunt-room.js';

const { createManager, BOT_TUNING_DEFAULT } = hunt;

class FakeConn extends EventEmitter {
  constructor() { super(); this.sent = []; }
  send(str) { this.sent.push(JSON.parse(str)); }
  close() { queueMicrotask(() => this.emit('close')); }
}

function runGame(seed, mode, botTuning) {
  const mgr = createManager({ rateLimit: Infinity, botTuning });
  mgr.createRoom({ seed });
  const conn = new FakeConn();
  mgr.attach(conn);
  conn.emit('message', JSON.stringify({ t: 'join', ver: 1, room: 'quick', name: 'scan' }));
  conn.emit('message', JSON.stringify({ t: 'act', kind: 'start', seq: 1 }));
  const room = [...mgr.rooms.values()][0];
  let guard = 0;
  while (room.phase !== 'end' && guard++ < 4000) {
    mgr.tick(100);
    const slot = room.slots[0];
    if (!slot || room.phase !== 'wave') continue;
    if (mode === 'bot') {
      if (room.now % 500 === 0) room.botDecide(slot); // 与 bot 同决策频率、同规则
    } else if (mode === 'optimal') {
      const mobs = [...room.mobs.values()];
      if (room.now >= slot.skillCdUntil && mobs.filter((m) => m.eta <= 3).length >= 3) {
        room.adjudicateSkill(slot);
      } else if (room.now >= slot.cdUntil) {
        const inner = mobs.filter((m) => m.eta <= 4).sort((a, b) => a.eta - b.eta);
        if (inner.length) room.adjudicateAttack(slot, inner[0].dir);
      }
    }
  }
  const end = conn.sent.filter((m) => m.t === 'ev' && m.kind === 'end').pop();
  room.destroy();
  return end ? { win: end.win, dur: end.dur, grade: end.grade } : { win: null, dur: null, grade: '超时' };
}

function sweep(mode, seeds, botTuning) {
  return seeds.map((s) => runGame(s, mode, botTuning));
}

function line(results) {
  const wins = results.filter((r) => r.win === true);
  const durs = wins.map((r) => r.dur);
  const hist = {};
  for (const d of durs) hist[d] = (hist[d] || 0) + 1;
  const mean = durs.length ? (durs.reduce((a, b) => a + b, 0) / durs.length).toFixed(1) : '—';
  return `胜 ${wins.length}/${results.length} 耐久[${Object.keys(hist).sort((a, b) => b - a).map((d) => `${d}×${hist[d]}`).join(' ') || '—'}] mean=${mean}`;
}

function summarize(mode, results) {
  const wins = results.filter((r) => r.win === true);
  const durs = wins.map((r) => r.dur);
  const inBand = wins.filter((r) => r.dur >= 6 && r.dur <= 9).length; // 3bot 目标带
  const badIdle = results.filter((r) => r.win === false || r.dur <= 3).length; // 挂机目标带
  const grades = {};
  for (const r of wins) grades[r.grade] = (grades[r.grade] || 0) + 1;
  console.log(`\n[${mode}] ${line(results)}`);
  console.log(`  评级: ${Object.entries(grades).sort().map(([g, n]) => `${g}×${n}`).join(' ') || '—'}`
    + `  | 目标命中: 挂机(负或≤3)=${badIdle}/${results.length}，3bot(6-9)=${inBand}/${results.length}`);
  console.log('  逐局:', results.map((r) => (r.win ? `${r.dur}` : '负')).join(' '));
}

const arg0 = process.argv[2] || '24';

if (arg0 === 'grid') {
  // 网格扫描：找同时满足两口径的参数（小样本快筛，选出后再用默认模式 24 seeds 确认）
  const n = Number(process.argv[3]) || 16;
  const seeds = Array.from({ length: n }, (_, i) => i + 1);
  console.log(`网格扫描 ${n} seeds/点：`);
  console.log('参数（犹豫/反应带/技能想起） → idle 局 | 3bot 局');
  for (const hesitateP of [0.5, 0.6, 0.7, 0.75, 0.8]) {
    for (const [reactBase, reactSpan] of [[2.2, 1.2], [1.8, 1.0], [1.5, 0.8]]) {
      for (const skillP of [0.6, 0.3]) {
        const tuning = { ...BOT_TUNING_DEFAULT, hesitateP, reactBase, reactSpan, skillP };
        const idle = sweep('idle', seeds, tuning);
        const bot = sweep('bot', seeds, tuning);
        const idleHit = idle.filter((r) => r.win === false || r.dur <= 3).length;
        const botHit = bot.filter((r) => r.win && r.dur >= 6 && r.dur <= 9).length;
        console.log(
          `p=${hesitateP} band=${reactBase}+${reactSpan}r skillP=${skillP}`
          + ` | idle: ${line(idle)} 目标${idleHit}/${n}`
          + ` | 3bot: ${line(bot)} 目标${botHit}/${n}`,
        );
      }
    }
  }
} else {
  const n = Number(arg0) || 24;
  const seeds = Array.from({ length: n }, (_, i) => i + 1);
  console.log(`《围猎》bot 平衡扫描：${n} seeds × 3 场景，默认参数 ${JSON.stringify(BOT_TUNING_DEFAULT)}`);
  summarize('idle（真人挂机，2 bot 独守）', sweep('idle', seeds));
  summarize('bot（3 bot 水准局）', sweep('bot', seeds));
  summarize('optimal（人类上限参考）', sweep('optimal', seeds));
}