FunctionProject/api/assets/functions/main/convertCurrency.js

const axios = require('axios')
const errorHandling = require('../../utils/errorHandling')
const { requiredFields } = require('../../config/errors')
const formatNumberResult = require('../secondary/formatNumberResult')

/* OUTPUTS */
module.exports = ({ res, next }, argsObject) => {
  let { number, baseCurrency, finalCurrency } = argsObject

  // S'il n'y a pas les champs obligatoire
  if (!(number && baseCurrency && finalCurrency)) {
    return errorHandling(next, requiredFields)
  }

  // Si ce n'est pas un nombre
  number = parseFloat(number)
  if (isNaN(number)) {
    return errorHandling(next, {
      message: 'Veuillez rentré un nombre valide.',
      statusCode: 400
    })
  }

  axios
    .get(`https://api.exchangeratesapi.io/latest?base=${baseCurrency}`)
    .then(response => {
      const rate = response.data.rates[finalCurrency]
      if (!rate) {
        return errorHandling(next, {
          message: "La devise n'existe pas.",
          statusCode: 404
        })
      }
      const result = rate * number
      const dateObject = new Date(response.data.date)
      const year = dateObject.getFullYear()
      const day = ('0' + dateObject.getDate()).slice(-2)
      const month = ('0' + (dateObject.getMonth() + 1)).slice(-2)
      const date = `${day}/${month}/${year}`
      const resultHTML = `<p>${formatNumberResult(number)} ${
        response.data.base
      } = ${formatNumberResult(
        result.toFixed(2)
      )} ${finalCurrency}</p><p>Dernier rafraîchissement du taux d'échange : ${date}</p>`
      return res.status(200).json({ date, result, resultHTML })
    })
    .catch(() =>
      errorHandling(next, {
        message: "La devise n'existe pas.",
        statusCode: 404
      })
    )
}