var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var index = require('./routes/index');
var users = require('./routes/users');
var app = express();
var fs = require('fs');
var util = require('util');
var crypto = require('crypto');
var http = require("http");
var url = require("url");

app.listen(3000, function () {
  console.log('Example app listening on port 3000!')
});

/*const now=(unit)=>{

  const hrTime=process.hrtime(); 
  switch (unit) {
    case 'milli':return hrTime[0] * 1000 + hrTime[1] / 1000000;
    case 'micro':return hrTime[0] * 1000000 + hrTime[1] / 1000;
    case 'nano':return hrTime[0] * 1000000000 + hrTime[1] ;
     break;
    default:return hrTime[0] * 1000000000 + hrTime[1] ;
  }
}*/

app.get('/multiMedia.json',function (req, res) {
  var name = req.query.name;
  var type =  req.query.type;
  var commadId = req.query.commandId;
  var pathfile = null;

  if (type === 'audio') {
    pathfile = './audio/' + name;
  } else if (type === 'video') {
    pathfile = './video/' + name;
  } else if (type === 'image') {
    pathfile = 'D:\\PROJECT@AIS\\SRFP_Node\\Genesis-SRFP\\public\\image\\' + name;
  } else {
    console.log('Access Denied');
  }

  // if (type === 'audio') {
  //   pathfile = path.join('D:', 'Node','Audio' , name);
  // } else if (type === 'video') {
  //   pathfile = path.join('D:', 'Node','Video' , name);
  // } else if (type === 'image') {
  //   pathfile = path.join('D:', 'Node','Image' , name);
  // } else {
  //   console.log('Access Denied');
  // }

  var file = fs.readFileSync(pathfile);
  var value = Buffer.from(file).toString('base64');

  var stats = fs.statSync(pathfile);
  var mtime = stats.mtime;
  var size = stats.size;

  console.log(mtime.toISOString().replace(/T/, ' ').replace(/\..+/, ''));
  // console.log(mtime.getTime());

  // Get the if-modified-since header from the request
  var reqModDate = req.headers['if-modified-since'];
  // console.log('If-modify ' + new Date(reqModDate).toISOString().replace(/T/, ' ').replace(/\..+/, ''));

  if (reqModDate != null) {
    reqModDate = new Date(reqModDate);
    if (reqModDate.getTime() == mtime.getTime()) {
      console.log("load from cache");
        res.writeHead(304, {
            "Last-Modified": mtime.toUTCString()
        });
          res.end();
    } else {
      console.log("no cache");
      var fileName = "test.jpg";
      res.download(pathfile, fileName);
      res.end();
    }
  } else {
    res.writeHead(304, {
      "Last-Modified": mtime.toUTCString()
      });
      res.end();
  }
  // res.send(value.toString());
});