var express = require('express');
const http = require('http').Server(router);
var router = express.Router();
var bodyParser = require('body-parser');
var path = require("path"); 
const nodemailer = require('nodemailer');
const fs = require('fs');
const multer = require('multer')
const Database = require('sqlite-async');
const { name } = require('ejs');
var execSync = require('child_process').execSync;
var jsonParser = bodyParser.json();
var urlencodedParser = bodyParser.urlencoded({
  extended: false
})
//桌面latest版
function execute(cmd){
	execSync(cmd,{cwd:'C:\\Users\\17217\\Desktop\\english\\python'},function(error, stdout, stderr){
	  if (error){
		console.log("error!")
		console.error(error);
	  }
	  else{
		console.log("运行成功!")
	  }
	})
}

//邮箱发送验证码 
function sendMails(mailId, VerificationCode){
    //设置邮箱配置、资源链接池
    var transporter = nodemailer.createTransport({
        //host:'smtp.qq.com',    //邮箱服务的主机，smtp.qq.com
        service: 'qq',
        port: '465',                //对应的端口号QQ邮箱的端口号是465
        secure: false,              //开启安全连接
        auth: {                              //用户信息
            user: '1721777650@qq.com',        //用来发邮件的邮箱账户
            pass: 'woaibabamama'         //这里的密码是qq的smtp授权码，可以去qq邮箱后台开通查看
        }
    });
 
    //设置收件人信息、邮件内容
    var mailOptions = {
        from: '1721777650@qq.com',           //发送者
        to: '947213307@qq.com',                         //接收者
        subject: '验证码邮件',  //主题
        text: '您的注册验证码为' + VerificationCode,    //文本内容
    };
 

    transporter.sendMail(mailOptions, (error) => {
      if (error) {
          return console.log(error);
      }
      console.log('邮件发送成功,发送至：', mailId);
  });
}

//验证码生成
function getVerificationCode(){ //传入需要的字符串长度
  // 准备一个用来抽取码的字符串，或者字典
  var verification_code_str = "abcdefghijklmnopqrstuvwxyz0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";  //数字和字母
  // 获取某个范围的随机整数，封装的函数，在上面抽取字典的时候进行了调用
  function getRandom(min, max) {                 //获取min-max数字之间的某个随机数，直接调用即可
    return Math.round(Math.random() * (max - min) + min);
  }
  let newStr = '';                    //创建一个空字符串，用来拼接四位随机码
  for (var i = 0; i < 4; i++) {       //for循环四次，则拼接四位随机码
    newStr += verification_code_str[getRandom(0, verification_code_str.length - 1)];   //从字典中随机选一个下标，并拼接到空字符串中
  }
  return newStr
}


function delDir(p) {   //删除文件夹，用于注销用户
  // 读取文件夹中所有文件及文件夹
  var list = fs.readdirSync(p)
  list.forEach((v) => {
    // 拼接路径
    var url = p + '/' + v
    // 读取文件信息
    var stats = fs.statSync(url)
    // 判断是文件还是文件夹
    if (stats.isFile()) {
      // 当前为文件，则删除文件
      fs.unlinkSync(url)
    } else {
      // 当前为文件夹，则递归调用自身
      arguments.callee(url)
    }
  })
  // 删除空文件夹
  fs.rmdirSync(p)
} 
// 定义全局变量
global.myVariable = '';
global.myVariable1 = '';
global.myVariable2 = '';
// 每2分钟更新一次全局变量
setInterval(function() {
  global.myVariable = '';
  global.myVariable1 = ''
  global.myVariable2 = '';
}, 120000);

router.get('/guanli', function (req, res, next) {
  res.render('guanli', {
    xiugai_success: req.session.message
  });
});

// 响应主页请求
router.get('/zuozhan', function(req, res) {
  const title = 'Dynamic EJS Page';
  const message = myVariable;

  res.render('zuozhan', { title: title, message: message });//将动态数据渲染到前端界面
});

// 响应主页请求
router.get('/zuozhan2', function(req, res) {
  const title = 'Dynamic EJS Page';
  const message = myVariable2;

  res.render('zuozhan2', { title: title, message: message });//将动态数据渲染到前端界面
});

/* GET home page. */
router.get('/', function (req, res, next) {
  // const checkUserStatus = setInterval(() => {
    if (req.session.user) {
      admin_portal_link = req.session.admin ? '/data/admin' : '';
      res.render('index', {
        user_name: req.session.user,
        admin_portal: admin_portal_link,
        admin: req.session.admin,
        message: req.session.message
      });
    } else {
      if (!req.session.error) req.session.error = "请先登录！"
      res.redirect('login');
    }
  // },1000)
});



/* Login functions */
router.get('/login', function (req, res) {
  res.render('login', {
    login_error: req.session.error
  });
});

router.get('/download', function (req, res, next) {
  res.render('download');
});
router.post('/login', urlencodedParser, function (req, res, next) {
  var name = req.body.name;  
  var pwd = req.body.pwd;
  var sqlite3 = require('sqlite3').verbose()  
  var sql = "SELECT * FROM users where username='" + name + "' and password='" + pwd+"'"
  var db = new sqlite3.Database('data.db', () => {  
      db.get(sql, function (err, row) {
              if (row== undefined) {
                  console.log('error');
                  req.session.error = "用户名或密码错误，请重新输入！";
                  res.redirect('login');
              } else {
                username = name
                // var exec = require('child_process').exec; 
                // exec(`python C:/Users/17217/Desktop/english/users/admin/log.py `+username)
                // db.run("delete from "+name,function(){  //每次先将表信息清空再重新读取文件夹里面的文件信息
                // });
                // fs.readdir('./users/'+name, 'utf8', function(err, data) {   
                //   console.log(data);
                //   for (var key in data) {
                //       console.log(key);
                //       var a=key
                //       console.log(data[key]);
                //       var b=data[key]
                //       var c = fs.statSync(path.join(__dirname,'../users/'+name+'/'+data[key]))
                //       console.log(c.size)
                //       var add = db.prepare("INSERT INTO "+name+"(fid,fname,fsize,fowner) VALUES(?,?,?,?)");//读取用户名文件夹下文件ID、文件名、大小并写入数据库中
                //       add.run(a,b,c.size,name);
                //       add.finalize();
                //   }
                // })
                if (name == 'admin')
                {
                  req.session.error = ''
                  req.session.message = '';
                  req.session.user = 'admin';
                  req.session.admin = true;
                  res.redirect('/')
                }
                else{
                  req.session.error = ''
                  req.session.message = '';
                  req.session.user = req.body.name;
                  req.session.admin = false;
                  res.redirect('/')
                }
              }
          }
      );
  })
});

router.get('/register', function (req, res, next) {
  res.render('register');
});

global.h1='';  //定义全局变量h1用于保存验证码信息



router.post('/register', urlencodedParser, function (req, res, next) {
  var name = req.body.username;
  var pwd = req.body.pwd1;
  var pwd1 =req.body.pwd2;
  var code1 = req.body.code;
  var mailId =req.body.email;
  if(code1=='')
  {
      VerificationCode = getVerificationCode()        //生成随机码
      global.h1 = VerificationCode;
      console.log('发送的验证码为：'+ VerificationCode)   
      sendMails(mailId, VerificationCode)          //发送邮箱验证码
  }
  else{
    if(code1==h1)
    {
      var sqlite3 = require('sqlite3').verbose()
      var sql = "SELECT * FROM users where username='" + name+"'"
      var db = new sqlite3.Database('data.db', () => {
          db.get(sql, function (err, row) {
            if(name==''||pwd=='')
            {
              res.send("用户名或密码不能为空！");
            }
            else{
              if (row == undefined) {
                if(pwd==pwd1){
                  fs.mkdir(path.join(__dirname, '../users/'+name), (err) => { 
                    if (err) { 
                        return console.error(err); 
                    } 
                    console.log('Directory created successfully!'); 
                });
                var a="create table "+name+"(fid varchar(15),fname varchar(15),fsize varchar(15),fowner varchar(15))"  
                db.run(a)
                var add = db.prepare("INSERT INTO users(username,password) VALUES(?,?)");
                add.run(req.body.username, req.body.pwd1);
                add.finalize();
                res.redirect('login');
                }
                else{
                    res.send("输入密码不一致！");
                }
            } 
            else {
                res.send("该用户名已存在，请重新注册");
            }
            }
          }
      );
      })
    }
    else{
      res.send("验证码错误！");
    }
  }
});

//文件上传页面
//上传文件到本地文件夹
router.post('/upload', multer({dest:'./users/'}).any(),function(req, res){ 
    filepath = 'users/admin/'
    filename = req.files[0].destination + req.files[0].originalname
    console.log("filename: "+filename);
    console.log("username: "+username)
    fs.rename(req.files[0].path, filepath + req.files[0].originalname, function(err){//重命名
      new_name = filepath + req.files[0].originalname
      originalname=req.files[0].originalname
      console.log("new_name: "+ new_name)
      var exec = require('child_process').exec; 
        
      new_name2='./'+new_name
      console.log("new_name2: "+ new_name2)
      
      if (err){
        res.send(err)
      }
      else{
        var sqlite3 = require('sqlite3').verbose()  
        var db = new sqlite3.Database('data.db', () => {
          db.run("delete from "+username,function(){  //每次先将表信息清空再重新读取文件夹里面的文件信息
          });
          fs.readdir('./users/'+username, 'utf8', function(err, data) {   //读取用户名文件夹下文件ID、文件名、大小并写入数据库中
            console.log(data);
            for (var key in data) {
                console.log(key);
                var a=key
                console.log(data[key]);
                var b=data[key]
                var c = fs.statSync(path.join(__dirname,'../users/'+username+'/'+data[key]))
                console.log(c.size)
                var add = db.prepare("INSERT INTO "+username+"(fid,fname,fsize,fowner) VALUES(?,?,?,?)");
                add.run(a,b,c.size,username);
                add.finalize();
            }
          }) 
        })
        // execute("python D:/99/ui_ref/users/admin/a.py")
        var exec = require('child_process').exec; 
        exec(`python C:/Users/17217/Desktop/english/users/admin/decode.py`)
        res.send('上传成功，点击←返回上一页');
      }
    })
})
//python
router.post('/execution',function(req, res){
  var exec = require('child_process').exec; 
  exec(`python C:/Users/17217/Desktop/english/users/admin/decode.py`)
  res.send('运行成功，点击←返回上一页！');
})


router.post("/getit", function (data, res) {
  fs.readFile("C:\\Users\\17217\\Desktop\\english\\result.txt", 'utf-8', (err, data) => {
      if (err) {
          console.error(err);
          return;
        }
        console.log(data);
        a = data;
        res.send(a);
  });
})

router.post("/histroy", function (data, res) {
  fs.readFile("C:\\Users\\17217\\Desktop\\english\\log.txt", 'utf-8', (err, data) => {
      if (err) {
          console.error(err);
          return;
        }
        console.log(data);
        a = data;
        res.send(a);
  });
})

router.post("/log", function (data, res) {
  fs.readFile("C:\\Users\\17217\\Desktop\\english\\rizhi.txt", 'utf-8', (err, data) => {
      if (err) {
          console.error(err);
          return;
        }
        console.log(data);
        a = data;
        res.send(a);
  });
})

//下达指令接口
router.post('/sendit', urlencodedParser,function (req, res) {
  var message = req.body.message;  
  console.log(message);
  myVariable = message;
  res.send('发送指令成功，点击←返回上一页！');
})

router.post('/sendit1', urlencodedParser,function (req, res) {
  var message = req.body.message;  
  console.log(message);
  myVariable2 = message;
  res.send('发送指令成功，点击←返回上一页！');
})

//回复命令接口
router.post('/sendit2', urlencodedParser,function (req, res) {
  var message = req.body.message;  
  console.log(message);
  myVariable1 = message;
  res.send('已向指挥员回复命令，点击←返回上一页！');
})



//修改用户名
router.post('/xiugai1', urlencodedParser, async function (req, res) {
  var name = req.body.name;
  if(name=='')
  {
    req.session.message = '用户名不能为空！' 
    res.redirect('guanli');
  } 
  else
  {
    const db = await Database.open(path.resolve(__dirname, '../data.db'));  //使用async await使代码相对顺序执行，防止还没执行数据库操作，req.session.user就改变了
    await db.run("update users set code = "+"'"+req.session.user+"'"+" WHERE username = "+"'"+req.session.user+"'",function(err){
    })
    await db.run("update users set username = "+"'"+name+"'"+" WHERE code = "+"'"+req.session.user+"'",function(err){
    })
    await db.run("alter table "+req.session.user+" rename to "+name,function(err){
    })
    fs.rename("users\\"+req.session.user, "users\\"+name, function(err) {//改用户文件夹名字
    })
    req.session.message = '用户名修改成功！' 
    req.session.user=name
    res.redirect('guanli');
    console.log(req.session.user);
  }
});
//修改密码
router.post('/xiugai2', urlencodedParser, function (req, res) {
  var pwd = req.body.pwd;
  if(pwd=='')
  {
    req.session.message = '密码不能为空！' 
    res.redirect('guanli');
  } 
  else
  {
    var sqlite3 = require('sqlite3').verbose()
    var db = new sqlite3.Database('data.db', () => {
      db.run("update users set password = "+pwd+" WHERE username = "+"'"+req.session.user+"'",function(err){//数据库查找并修改对应用户名的密码
    })
    }) 
    req.session.message = '密码修改成功！' 
    res.redirect('guanli');
  }
});
//用户注销
router.post('/zhuxiao', async function (req, res) {
  var sqlite3 = require('sqlite3').verbose()
  var db = new sqlite3.Database('data.db', () => {
    var sql_del = db.prepare("delete from users where username='"+req.session.user+"'")
    sql_del.run()
    db.run("drop table "+req.session.user,function(err){
    })
  }) 
  delDir("users\\"+req.session.user)
  req.session.error = '注销成功！'
  res.redirect('login');
});

/* Logout functions */
router.get('/logout', function (req, res, next) {
  req.session.user = 0;
  req.session.message = '';
  req.session.admin = false;
  res.redirect('/')
});
module.exports = router;