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const express = require("express");
const bodyParser = require("body-parser");
const xml2js = require("xml2js");
const soap = require("soap");

const app = express();
app.use(bodyParser.text({ type: "text/xml" }));

const service = {
  Calculator: {
    CalculatorService: {
      add: (args) => {
        const { a, b } = args;
        return { result: a + b };
      },
      subtract: (args) => {
        const { a, b } = args;
        return { result: a - b };
      },
      multiply: (args) => {
        const { a, b } = args;
        return { result: a * b };
      },
      divide: (args) => {
        const { a, b } = args;
        return { result: a / b };
      },
    },
  },
};

app.post("/calculator", (req, res) => {
  soap.listen(app, "/calculator", service, xml => {
    const parser = new xml2js.Parser();
    parser.parseString(xml, (err, result) => {
      const { Body } = result["soap:Envelope"];
      const keys = Object.keys(Body);
      const operation = keys[0];
      const args = Body[operation]["0"];

      const response = service.Calculator.CalculatorService[operation](args);

      const builder = new xml2js.Builder();
      const xmlResponse = builder.buildObject({
        "soap:Envelope": {
          "$": {
            "xmlns:soap": "http://schemas.xmlsoap.org/soap/envelope/",
            "soap:encodingStyle": "http://schemas.xmlsoap.org/soap/encoding/",
          },
          "soap:Body": [
            {
              [`${operation}Response`]: [
                response,
              ],
            },
          ],
        },
      });

      res.status(200).type("text/xml").send(xmlResponse);
    });
  });
});

const port = process.env.PORT || 3000;
app.listen(port, () => {
  console.log(`SOAP service listening on http://localhost:${port}/calculator`);
});