import express from 'express';
import type { Request, Response, NextFunction } from 'express';
import fs from 'fs';
import path from 'path';
import cors from "cors";
import multer from "multer";
import * as douyin from './douyin'

const app = express();
const PORT = process.env.PORT || 6100;

const __dirname = path.dirname(new URL(import.meta.url).pathname);

app.use(cors());

// 仅解析明确类型；不要用 '*/*'
app.use(express.json({ limit: '10mb', type: ['application/json'] }));
app.use(express.urlencoded({ extended: true, limit: '10mb', type: ['application/x-www-form-urlencoded'] }));

// QQ机器人回显功能
app.post('/', async (req: Request, res: Response) => {
  // 检查是否是消息类型的请求
  if (!req.body || req.body.post_type != 'message') return
  const { target_id, raw_message, message_type, user_id } = req.body;

  console.log(`\n[QQ机器人] 收到${message_type}消息`);
  console.log(`发送者ID: ${user_id || target_id}`);
  console.log(`消息内容: ${raw_message}`);

  // Match Douyin URL
  // Like: https://v.douyin.com/YqgJL_phY_k/
  const douyinUrlPattern = /https?:\/\/v\.douyin\.com\/[a-zA-Z0-9_-]+/;
  const douyinMatch = raw_message.match(douyinUrlPattern);

  try {
    // 如果检测到抖音链接，调用解析API
    if (douyinMatch) {
      const douyinUrl = douyinMatch[0];
      console.log(`[抖音链接检测] 发现抖音链接: ${douyinUrl}`);
      sendMsg(`[抖音链接检测] 发现抖音链接: ${douyinUrl}，启动 Chromium 中...`, target_id);

      douyin.downloadDouyinMedia(douyinUrl, target_id);
    }
  } catch (error) {
    console.error(`[错误] 处理消息时发生错误:`, error);

    sendMsg(String(error), target_id);
  }

});

function sanitizeDirname(input: string) {
  // 基础清洗：去除路径分隔符、控制字符，并截断长度（防止奇怪标题）
  const s = (input || "default")
    .trim()
    .replace(/[\\/]+/g, "_")
    .replace(/[<>:"|?*\u0000-\u001F]/g, "_")
    .slice(0, 128) || "default";
  return s;
}

const storage = multer.diskStorage({
  destination: (req, _file, cb) => {
    const title = sanitizeDirname(req.query.title as string);
    const baseDir = process.env.DOWNLOAD_DIR || path.join(__dirname, "downloads");
    const dest = req.query.type == 'image' ? path.join(baseDir, title) : baseDir;

    fs.mkdir(dest, { recursive: true }, (err) => cb(err, dest));
  }, filename: (req, file, cb) => {
    const ext = path.extname(file.originalname || "");
    const title = sanitizeDirname(req.query.title as string);

    cb(null, `${title}_${Date.now()}_${Math.random().toString(36).slice(2)}${ext}`);
  },
});
const upload = multer({
  storage,
  // 限制：单文件最大 1GB、最多 50 个字段（可按需调整）
  limits: { fileSize: 1024 * 1024 * 1024, fields: 50, files: 50 },
  fileFilter: (_req, file, cb) => {
    // 只接受字段名以 file_ 开头的文件，其他拒绝
    if (/^file_\d+$/i.test(file.fieldname)) cb(null, true);
    else cb(new Error(`Unexpected file field: ${file.fieldname}`));
  }
});

app.post("/upload", upload.any(), (req, res) => {
  // 1) 取出文件：multer.any() 把所有文件放在 req.files
  const files = (req.files as Express.Multer.File[]) || [];
  // 只保留我们关心的 file_*
  const accepted = files.filter(f => /^file_\d+$/i.test(f.fieldname));

  let meta = {
    title: req.body.title,
    type: req.query.type as 'video' | 'image',
    target_id: req.query.target_id
  };

  console.log(meta);
  console.log(`收到上传: ${accepted.length} 个文件`, files.map(f => f.path));

  if (meta.target_id) {
    const totalSize = accepted.reduce((sum, f) => sum + f.size, 0);
    sendMsg(`[抖音下载] ${meta.title}，已下载 ${accepted.length} 个文件，类型 ${meta.type}，共 ${(totalSize/1024/1024).toFixed(2)} MB，上传中...`, meta.target_id as string);
    accepted.forEach(f => {
      sendMediaMsg(f.path, meta.target_id as string, meta.type);
    })
  }
  res.json({ ok: true, files: accepted.length, meta });
});

function sendMsg(msg: string, target_id: string) {
  const replyMessage = {
    user_id: String(target_id),
    message: [
      {
        type: "text",
        data: {
          text: msg
        }
      }
    ]
  }

  const replyUrl = `http://localhost:30000/send_private_msg`;

  console.log(`[发送消息] ${msg} -> ${target_id}`);

  return fetch(replyUrl, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(replyMessage)
  });
}

function sendMediaMsg(filePath: string, target_id: string, type: 'video' | 'image') {
  const mediaMessage = {
    user_id: String(target_id),
    message: [
      {
        type: type,
        data: {
          file: `file://${filePath}`
        }
      }
    ]
  }

  const replyUrl = `http://localhost:30000/send_private_msg`;

  console.log(`[发送媒体消息] ${type} - ${filePath} -> ${target_id}`);

  return fetch(replyUrl, {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
    },
    body: JSON.stringify(mediaMessage)
  });
}

app.use((error: any, req: Request, res: Response, next: NextFunction) => {
  const timestamp = new Date().toISOString();
  console.error(`\n[${timestamp}] 错误:`, error);

  res.status(500).json({
    success: false,
    message: '服务器内部错误',
    error: error.message
  });
});

// 启动服务器
app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
  console.log(`With env:`, { DOWNLOAD_DIR: process.env.DOWNLOAD_DIR, PORT: process.env.PORT });
});