'use strict';

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

const BRIDGE_FILE = path.join(require('os').homedir(), '.persistent-chat-local', 'bridge-log.json');

function readLog() {
  try { return JSON.parse(fs.readFileSync(BRIDGE_FILE, 'utf8')); } catch { return { entries: [] }; }
}

function writeLog(log) {
  fs.mkdirSync(path.dirname(BRIDGE_FILE), { recursive: true });
  fs.writeFileSync(BRIDGE_FILE, JSON.stringify(log, null, 2));
}

/**
 * FR-BRIDGE: 将 Composer/增强结论注入 ct_ 会话
 * @param {object} opts
 * @param {Map} sessions
 * @param {Map} pendingWaits
 * @param {function} nowMs
 * @param {function} saveSessions
 */
function syncToSession(opts, sessions, pendingWaits, nowMs, saveSessions) {
  const { token, content, source = 'composer' } = opts;
  if (!token || !sessions.has(token)) {
    return { ok: false, error: 'UNKNOWN_CONVERSATION_TOKEN' };
  }
  if (!content || typeof content !== 'string' || !content.trim()) {
    return { ok: false, error: 'content 不能为空' };
  }

  const s = sessions.get(token);
  const injected = `[BRIDGE:${source}]\n${content.trim()}\n\n请基于以上内容做卡若复盘（🎯📌💡📝▶）并继续 wait。`;
  s.mode = s.bridged ? 'A+B' : (s.mode || 'A');
  s.bridged = true;
  s.lastBridgeAt = nowMs();
  s.lastActiveAt = nowMs();
  (s.messages = s.messages || []).push({ role: 'user', content: injected, at: nowMs(), bridge: true });

  const wait = pendingWaits.get(token);
  let wakeWaiting = false;
  if (wait) {
    pendingWaits.delete(token);
    s.status = 'idle';
    wait.resolve(injected);
    wakeWaiting = true;
  }

  saveSessions();
  const log = readLog();
  log.entries = (log.entries || []).slice(-99);
  log.entries.push({ token, at: nowMs(), source, wakeWaiting, len: content.length });
  writeLog(log);

  return { ok: true, token, wakeWaiting, mode: s.mode, injectedLen: injected.length };
}

module.exports = { syncToSession, readLog, BRIDGE_FILE };