Cat Facts!

var express = require('express');
var bodyParser = require('body-parser');
var verifier = require('alexa-verifier');
var request = require('request');
var app = express();
 
 //make sure to verify the request
app.use(function(req, res, next) {
  if (!req.headers.signaturecertchainurl) {
    return next();
  }

  req._body = true;
  req.rawBody = '';
  req.on('data', function(data) {
    return req.rawBody += data;
  });
  req.on('end', function() {
    var cert_url, er, error, requestBody, signature;
    try {
      req.body = JSON.parse(req.rawBody);
    } catch (error) {
      er = error;
      req.body = {};
    }
    cert_url = req.headers.signaturecertchainurl;
    signature = req.headers.signature;
    requestBody = req.rawBody;
    verifier(cert_url, signature, requestBody, function(er) {
      if (er) {
        console.error('error validating the alexa cert:', er);
        res.status(401).json({ status: 'failure', reason: er });
      } else {
        next();
      }
    });
  });
});


app.use(bodyParser.json());

app.get('/', function(req, res){
	res.send("hello");
})

app.post('/', function(req, res){

	//sample data to make alexa return a response
	var data = {
		"version": "1.0",
		"response": {
			"outputSpeech": {
				"type": "PlainText",
				"text": "Please work!"
			},
			"shouldEndSession": true
		},
        "reprompt": {
              "outputSpeech": {
                "type": "PlainText",
                "text": "Want another fact?"
              }
            },
		"sessionAttributes": {}
	}

	var info = req.body.request;

    //handle different types of requests
    if(info.type == 'LaunchRequest'){
         data.response.outputSpeech.text = "Hey! Ask me for a cat fact."
         data.response.shouldEndSession = false;
         res.send(data);
         
    }

    else if(info.type=='SessionEndedRequest'){}

    else if(info.type=='IntentRequest'){


    if(info.intent.name == "AMAZON.HelpIntent"){
        console.log("help intent");
        data.response.outputSpeech.text = "You can ask me for a random cat fact."
        data.response.shouldEndSession = false;
        res.send(data);
    }

    else if(info.intent.name == "AMAZON.CancelIntent" || info.intent.name == "AMAZON.StopIntent"){
        console.log("cancel intent");
        data.response.outputSpeech.text = "Good-bye."
        data.response.shouldEndSession = true;
        res.send(data);
    }

    else if(info.intent.name == "GetFact"){

        //use request, an HTTP library to send an HTTP request to the cat facts api
        request('http://catfacts-api.appspot.com/api/facts?number=1',   function (error, response, body) {
          if (!error && response.statusCode == 200) {
            console.log(JSON.parse(body).facts[0]) 
            //send the fact after retrieving it from the api
            var fact = JSON.parse(body).facts[0];
            data.response.outputSpeech.text = fact
            data.response.shouldEndSession = true;
            res.send(data);
          }
          else{
            data.response.outputSpeech.text = fact
            data.response.shouldEndSession = true;
            res.send("whoops! there was a problem getting the fact.");
          }
        });

    }

}

})
var port = process.env.PORT || 3000;
app.listen(port, function () {
  
    console.log('cat server is up!');

});