/**
 * assets.mjs — 模拟竞技场的资产事实源：
 * 1. durations：ffprobe 实测 web/hunt/audio 全部 ogg 时长（感知模型按真实节奏排语音链）
 * 2. voiceText：解析 docs/design/23-hunt-voice-ids.md 的台词表（转写要写台词全文）
 *
 * 产物缓存 research/hunt-sim/assets-cache.json，arena 启动时刷新一次。
 */
import fs from 'node:fs';
import path from 'node:path';
import { execFileSync } from 'node:child_process';
import { fileURLToPath } from 'node:url';

const HERE = path.dirname(fileURLToPath(import.meta.url));
export const ROOT = path.resolve(HERE, '..', '..', '..', '..'); // 仓库根（lib→hunt-sim→harness→web→根）
const AUDIO = path.join(ROOT, 'web', 'hunt', 'audio');
const VOICE_IDS = path.join(ROOT, 'docs', 'design', '23-hunt-voice-ids.md');
const CACHE = path.join(ROOT, 'research', 'hunt-sim', 'assets-cache.json');
const FFPROBE = path.join(ROOT, 'tools', 'bin', 'ffprobe');

function probeDurations() {
  const out = {};
  const walk = (dir) => {
    for (const ent of fs.readdirSync(dir, { withFileTypes: true })) {
      const p = path.join(dir, ent.name);
      if (ent.isDirectory()) walk(p);
      else if (ent.name.endsWith('.ogg')) {
        out[path.relative(AUDIO, p).replace(/\.ogg$/, '')] = null;
      }
    }
  };
  walk(AUDIO);
  for (const rel of Object.keys(out)) {
    let d = 0;
    try {
      const csv = execFileSync(FFPROBE, [
        '-hide_banner', '-loglevel', 'error',
        '-show_entries', 'format=duration', '-of', 'csv=p=0',
        path.join(AUDIO, rel + '.ogg'),
      ], { encoding: 'utf8' });
      d = Number(csv.trim()) || 0;
    } catch (_) { /* 缺资产记 0（感知模型有兜底时长） */ }
    out[rel] = d;
  }
  return out;
}

/** id → 台词全文（npc_* 逐条登记于台词表 N 组；V 组键盘变体不入映射）。 */
export function voiceTextMap() {
  const md = fs.readFileSync(VOICE_IDS, 'utf8');
  const map = {};
  let inKeySection = false;
  for (const line of md.split('\n')) {
    if (/^##\s*V\s*组/.test(line)) inKeySection = true; // 键盘变体同 id 重排，会覆盖触屏原句
    if (inKeySection) continue;
    const m = line.match(/^\|\s*`([a-z0-9_]+)`\s*\|\s*([^|]+?)\s*\|/);
    if (!m) continue;
    const id = m[1];
    const text = m[2].trim();
    if (!text || /^[A-Za-z0-9_`]+$/.test(text.replace(/`/g, ''))) continue; // 表头/引用列
    map[id] = text;
  }
  return map;
}

/** 加载（必要时生成）资产事实缓存。 */
export function loadAssets() {
  let cache = null;
  try { cache = JSON.parse(fs.readFileSync(CACHE, 'utf8')); } catch (_) { /* 重探 */ }
  if (!cache || !cache.durations || !cache.voiceText) {
    cache = { durations: probeDurations(), voiceText: voiceTextMap(), at: new Date().toISOString() };
    fs.mkdirSync(path.dirname(CACHE), { recursive: true });
    fs.writeFileSync(CACHE, JSON.stringify(cache, null, 1));
  }
  return cache;
}