var express = require('express');
var request = require('request');
var winston = require('winston');


var app = express();
var logger = new (winston.Logger)({
  transports: [
    new (winston.transports.File)({ filename: 'errors.log' })
  ]
});
var tracker = new (winston.Logger)({
  transports: [
    new (winston.transports.File)({ filename: 'stats.log' })
  ]
});



app.use(express.static('static'));

app.get('/', function (req, res) {
  // res.send('Hello World!');
  res.redirect("/index.html");
});


app.get('/:username', function (req, res) {
  var username = req.params.username
	var apiKey = ""
  var channelRequestURL = "https://www.googleapis.com/youtube/v3/channels?part=contentDetails&forUsername="+username+"&key="+apiKey
  
  request(channelRequestURL, function (channelError, channelResponse, channelBody) {
  	if (channelResponse.statusCode != 200 || channelError) {
	  	logger.log('info', 'Error during channelRequest (statusCode: %d), requested username: %s', channelResponse.statusCode, username);
	  	res.redirect("/error.html");
	  }else{
	  	// console.log(channelBody)
	  	var channelDataJSON = JSON.parse(channelBody)
	  
			if (channelDataJSON['pageInfo']['totalResults'] == 0) {
				logger.log('info', 'Error during channelRequest (totalResults = 0), requested username: %s', username);
				res.redirect("/error.html");
			}else{
				var channelId = channelDataJSON['items'][0]['id']
				var maxResults = 1
				var videoRequestURL = "https://www.googleapis.com/youtube/v3/search?part=snippet&channelId=" + channelId + "&maxResults=" + maxResults + "&order=date&type=video&key=" + apiKey
				
				request(videoRequestURL, function (videoError, videoResponse, videoBody){
					if (videoResponse.statusCode != 200 || videoError) {
			  		logger.log('info', 'Error during videoRequest (statusCode: %d), requested username: %s', videoResponse.statusCode, username);
	  				res.redirect("/error.html");
	  			}else{
	  				var videoDataJSON = JSON.parse(videoBody);
	  				
	  				// console.log(videoBody);

						if (videoDataJSON['pageInfo']['totalResults'] == 0) {
		    			res.redirect('https://www.youtube.com/user/'+username+'/videos');		    		
		    		}else{

							var videos = videoDataJSON["items"];
							var videoID = videos[0]["id"]["videoId"]

			    		tracker.log('info', 'Success, requested username: %s', username);
			    		res.redirect('https://youtu.be/'+videoID);	

		    		}//else
	  			}//else
				})//request
			}//else 
	  }//else
	})//request
});//app.get


var server = app.listen(80, function () {
  var host = server.address().address;
  var port = server.address().port;

  console.log('Latest vid forwarder running at http://%s:%s', host, port);
});