var https = require('follow-redirects').https;
var fs = require('fs');

var options = {
  'method': 'POST',
  'hostname': 'api.swep.net',
  'path': '/calculateSinglePhase',
  'headers': {
    'X-API-KEY': 'YOUR_API_KEY',
    'Content-Type': 'application/json'
  },
  'maxRedirects': 20
};

var req = https.request(options, function (res) {
  var chunks = [];

  res.on("data", function (chunk) {
    chunks.push(chunk);
  });

  res.on("end", function (chunk) {
    var body = Buffer.concat(chunks);
    console.log(body.toString());
  });

  res.on("error", function (error) {
    console.error(error);
  });
});

var postData = JSON.stringify({
  "inputs": {
    "calculationMethod": "Design",
    "selectedFluidSide1": {
      "fluidId": 53,
      "isGas": false,
      "inputValue": null
    },
    "selectedFluidSide2": {
      "fluidId": 53,
      "isGas": false,
      "inputValue": null
    },
    "coCurrent": false,
    "selectedHeatExchangers": [
      {
        "heatExchangerInputType": "Parent",
        "id": 1
      }
    ],
    "heatLoad": {
      "amount": 1500,
      "unit": "HeatLoadUnit.Kilowatt"
    },
    "inletTemperatureSide1": {
      "amount": 80,
      "unit": "TemperatureUnit.DegreeCelsius"
    },
    "inletTemperatureSide2": {
      "amount": 20,
      "unit": "TemperatureUnit.DegreeCelsius"
    },
    "outletTemperatureSide1": {
      "amount": 40,
      "unit": "TemperatureUnit.DegreeCelsius"
    },
    "outletTemperatureSide2": {
      "amount": 50,
      "unit": "TemperatureUnit.DegreeCelsius"
    },
    "flowSide1": null,
    "flowSide2": null,
    "maxPressureDropSide1": {
      "amount": 20000,
      "unit": "PressureUnit.Pascal"
    },
    "maxPressureDropSide2": {
      "amount": 20000,
      "unit": "PressureUnit.Pascal"
    },
    "numberOfPasses": null,
    "numberOfPlates": null,
    "numberOfPlatesStack1": null,
    "numberOfPlatesStack2": null,
    "oversurface": null,
    "portSwitch": true,
    "autoperformance": false
  }
});

req.write(postData);

req.end();