const express = require('express');
const bodyParser = require('body-parser');
const Request = require("request-promise");
const map = require('crocks/pointfree/map')

const app = express();

app.use(bodyParser.json());

const range = integer => [...new Array(integer).keys()]
const replicate = (i, x) => range(i).fill(x)

const handleError = error => {
  logger.debug('[' + pid + '] ' + error.reponse.error)
  return error;
}

const getMaterialURIs = response =>
  replicate(response.body.floor.length, `http://localhost:8080/material/q=${response.body.material}`)

const processMaterialResponse = response => {
  doSomethingWithMaterial(response.body)
  return response;
}

const processMaterialResponses =

const getSiteValueURI = response =>
  `http://localhost:8080/value/q=${response.body.value}`;

const processSiteValueResponse = response =>
  doSomethingWithSiteValue(response.body)
  return response;
}

app.post('/building/', function (req, res) {
  const uri = 'http://localhost:8080/site/';
  const body = JSON.stringify(req.body);
  const method = 'POST';
  const headers = { 'Content-Type': 'application/json' };

  // First External API Call
  Request({uri, body, method, headers})
    // 1: fetch to derive the material URI
    .then(getMaterialURIs)
    // 2: fetch from that material URI
    .then(map(Request.get))
    .then(Promise.all)
    // 3: process the material response
    .then(map(processMaterialResponse))
    // 4: derive the siteValueURI
    .then(map(getSiteValueURI))
    // 5: fetch the siteValueURI
    .then(map(Request.get))
    .then(Promise.all)
    // 6: process the site value response
    .then(map(processSiteValueResponse))
    .catch(handleError)
    .then(response => {
      res.writeHead(200, { 'Content-Type': 'application/json' });
      res.end('{"material":"materialquerystring","value":"valuequerystring"}');
    })
  })
});