'use strict';

const fs = require('fs');
const path = require('path');

const MODE_BADGES = { A: 'A·续跑', B: 'B·增强', 'A+B': 'A+B·已桥接' };

function detectRulesConflict(workspace) {
  const rulesDir = path.join(workspace, '.cursor', 'rules');
  const hits = [];
  if (!fs.existsSync(rulesDir)) return { conflict: false, hits, message: '无 rules 目录' };
  const files = fs.readdirSync(rulesDir).filter((f) => f.endsWith('.mdc') && !/\.retired$/i.test(f));
  const hasPchat = files.some((f) => /persistent-chat/i.test(f));
  const hasCochat = files.some((f) => /^co-chat\.mdc$/i.test(f));
  if (hasPchat && hasCochat) {
    hits.push('co-chat.mdc', 'persistent-chat.mdc');
    return {
      conflict: true,
      hits,
      message: '同一工作区同时加载 co-chat.mdc 与 persistent-chat.mdc — 请用双 Chat 模板分离（FR-TPL）',
    };
  }
  return { conflict: false, hits: files, message: hasPchat ? '仅 persistent-chat（模式 A OK）' : (hasCochat ? '仅 co-chat（建议迁移到 pchat）' : '未检测到 pchat/co-chat 规则') };
}

function sessionBadge(session) {
  const mode = session?.mode || 'A';
  if (session?.bridged && mode === 'A') return MODE_BADGES['A+B'];
  return MODE_BADGES[mode] || MODE_BADGES.A;
}

function setSessionMode(session, mode) {
  if (!['A', 'B', 'A+B'].includes(mode)) return false;
  session.mode = mode;
  return true;
}

module.exports = { detectRulesConflict, sessionBadge, setSessionMode, MODE_BADGES };