const express = require("express");
const app = express();

const v03 = require("cloudevents-sdk/v03");
const unmarshaller03 = new v03.HTTPUnmarshaller();

const v02 = require("cloudevents-sdk/v02");
const unmarshaller02 = new v02.HTTPUnmarshaller();

const v1 = require("cloudevents-sdk/v1");
const structured1 = new v1.StructuredHTTPReceiver();
const binary1 = new v1.BinaryHTTPReceiver();

app.use((req, res, next) => {
    let data="";

    req.setEncoding("utf8");
    req.on("data", function(chunk) {
       data += chunk;
    });

    req.on("end", function() {
        req.body = data;
        next();
    });
});

app.post("/v1", function (req, res) {
  console.log(req.headers);
  console.log(req.body);

  try {
    let myevent = structured1.parse(req.body, req.headers);
    // pretty print
    console.log("Accepted event:");
    console.log(JSON.stringify(myevent.format(), null, 2));

    res.status(201)
          .json(myevent.format());

  } catch (err) {
    console.error(err);
    res.status(415)
          .header("Content-Type", "application/json")
          .send(JSON.stringify(err));
  }
});

app.post("/v1/binary", function (req, res) {
  console.log(req.headers);
  console.log(req.body);

  try {
    let myevent = binary1.parse(req.body, req.headers);
    // pretty print
    console.log("Accepted event:");
    console.log(JSON.stringify(myevent.format(), null, 2));

    res.status(201)
          .json(myevent.format());

  } catch (err) {
    console.error(err);
    res.status(415)
          .header("Content-Type", "application/json")
          .send(JSON.stringify(err));
  }
});

app.post("/v03", function (req, res) {
  console.log(req.headers);
  console.log(req.body);

  unmarshaller03.unmarshall(req.body, req.headers)
    .then(cloudevent => {
      // pretty print
      console.log("Accepted event:");
      console.log(JSON.stringify(cloudevent.format(), null, 2));

      res.status(201)
            .json(cloudevent.format());
  })
  .catch(err => {
    console.error(err);
    res.status(415)
          .header("Content-Type", "application/json")
          .send(JSON.stringify(err));
  });
});

app.post("/v02", function (req, res) {
  console.log(req.headers);
  console.log(req.body);

  unmarshaller02.unmarshall(req.body, req.headers)
    .then(cloudevent => {
      // pretty print
      console.log("Accepted event:");
      console.log(JSON.stringify(cloudevent.format(), null, 2));

      res.status(201)
            .json(cloudevent.format());
  })
  .catch(err => {
    console.error(err);
    res.status(415)
          .header("Content-Type", "application/json")
          .send(JSON.stringify(err));
  });
});

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