// 消息路由 + AI 分析
const express = require('express');
const { authMiddleware } = require('../middleware/auth');
const { broadcastToRoomExcludeSelf, broadcastToRoom } = require('../ws');
const { buildSystemPrompt } = require('../ai/prompt');
const { validate, normalize } = require('../ai/validator');
const { callDeepSeek } = require('../ai/client');
const { getHistory, addToHistory, hasPendingAction, handleAIResult, executePendingAction } = require('../handlers');
const db = require('../db');
const { timestamp } = require('../utils');

const router = express.Router();

router.get('/:roomId/messages', authMiddleware, (req, res) => {
  const msgs = db.prepare('SELECT * FROM messages WHERE room_id = ? ORDER BY id ASC').all(req.params.roomId);
  res.json(msgs);
});

router.post('/:roomId/messages', authMiddleware, async (req, res) => {
  const { text, attachments } = req.body;
  console.log('📨 收到消息, text:', (text||'').substring(0,30), 'attachments:', JSON.stringify(attachments));
  const roomId = req.params.roomId;
  const username = req.user.username;
  const now = timestamp();

  const result = db.prepare('INSERT INTO messages (room_id, user, text, attachments, timestamp) VALUES (?,?,?,?,?)').run(
    roomId, username, text || '', attachments ? JSON.stringify(attachments) : null, now
  );
  const msg = { id: result.lastInsertRowid, room_id: roomId, user: username, text: text || '', attachments: attachments || [], timestamp: now };

  const lastMsg = db.prepare('SELECT text, timestamp FROM messages WHERE room_id = ? ORDER BY id DESC LIMIT 1').get(roomId);
  broadcastToRoomExcludeSelf(roomId, username, {
    type: 'new_message', message: msg,
    room_preview: { room_id: roomId, last_message: lastMsg ? lastMsg.text : '', last_time: lastMsg ? lastMsg.timestamp : '' }
  });
  addToHistory(roomId, 'user', `${username}: ${text || '图片'}`);
  res.json(msg);

  if (text && text.trim() === '确认' && hasPendingAction(roomId, username)) {
    executePendingAction(roomId, username);
    return;
  }

  try {
    const history = getHistory(roomId);
    const historyMessages = history.map(e => ({ role: e.role, content: e.content }));
    const aiResponse = await analyzeWithDeepSeek(text || '', historyMessages, username, req.user.isAdmin, roomId);
    if (aiResponse) {
      var responses = Array.isArray(aiResponse) ? aiResponse : [aiResponse];
      responses.forEach(function(r) {
        if (r.action !== 'ignore') handleAIResult(r, roomId, username, text || '', attachments || []);
      });
    }
  } catch (e) {
    console.error('AI 分析失败:', e.message);
    var errText = '❌ ' + (e.message || 'AI 处理失败，请稍后重试');
    var errResult = db.prepare('INSERT INTO messages (room_id, user, text, timestamp) VALUES (?,?,?,?)').run(roomId, '小财', errText, timestamp());
    var errMsg = { id: errResult.lastInsertRowid, room_id: roomId, user: '小财', text: errText, attachments: [], timestamp: timestamp() };
    broadcastToRoom(roomId, { type: 'new_message', message: errMsg });
  }
});

async function analyzeWithDeepSeek(text, historyMessages, username, isAdmin, roomId) {
  // 采购清单（单独消息）
  var purchases = db.prepare("SELECT item, quantity, amount, status, created_at FROM purchases WHERE room_id = ? ORDER BY created_at DESC LIMIT 10").all(roomId);
  var purchaseMsg = purchases.length
    ? '📋 当前房间采购清单（最近10条）：\n' + purchases.map(function(p) { return '- ' + p.item + ' | ×' + p.quantity + ' | ¥' + p.amount + ' | ' + p.status + ' | ' + p.created_at; }).join('\n')
    : '';
  // 系统提示词（稳定，不含时间）
  var systemPrompt = buildSystemPrompt(username, isAdmin);
  var messages = [
    { role: 'system', content: systemPrompt }
  ];
  // 全量历史，每 30 条一轮前缀稳定期，轮内全部命中
  historyMessages.forEach(function(m) { messages.push(m); });
  // 采购清单、时间放最后，变动不影响历史命中
  if (purchaseMsg) messages.push({ role: 'system', content: purchaseMsg });
  messages.push({ role: 'system', content: '当前服务器时间：' + new Date().toLocaleString('zh-CN', { timeZone: 'Asia/Shanghai', hour12: false }) });
  // 当前消息已在 historyMessages 中，不再重复 push
  const content = await callDeepSeek(messages, username);
  console.log('🤖 AI 返回:', content.substring(0, 200));
  // 打印消息结构，方便排查缓存
  console.log('📋 消息结构:', messages.map(function(m, i) {
    var preview = m.content.substring(0, 60).split('\n').join(' ');
    return '[' + i + '] ' + m.role + ' (' + m.content.length + '字): ' + preview;
  }).join('\n'));
  try {
    var cleaned = content.replace(/```json|```/g, '').trim();
    if (!cleaned) { console.warn('⚠️ AI 返回空内容'); return { action: 'ignore' }; }
    var parsed = JSON.parse(cleaned);
    // 支持批量：AI 可能返回数组
    if (Array.isArray(parsed)) {
      parsed.forEach(function(item, i) {
        normalize(item);
        var v = validate(item);
        if (!v.valid) console.warn('⚠️ AI 返回[' + i + ']校验失败:', v.error);
      });
    } else {
      normalize(parsed);
      var v = validate(parsed);
      if (!v.valid) console.warn('⚠️ AI 返回校验失败:', v.error);
    }
    return parsed;
  } catch (e) {
    // AI 返回非 JSON（如纯文本回复图片消息）→ 降级为 chat
    console.warn('⚠️ AI 返回非 JSON，降级为 chat:', content.substring(0, 50));
    return { action: 'chat', reply: content };
  }
}

module.exports = router;