'use strict';

// You can use your favorite http client package to make REST calls, however, the node fetch API is pre-installed with the bots-node-sdk.
// Documentation can be found at https://www.npmjs.com/package/node-fetch
// Un-comment the next line if you want to make REST calls using node-fetch. 
const fetch = require("node-fetch")

module.exports = {
  metadata: () => ({
    name: 'complete.training.CurrencyConverter',
    properties: {
      variable: { required: true, type: 'string' },
      baseCurrency: { required: true, type: 'string' },
      targetCurrencies: { required: true, type: 'string' },
      amount: { required: true, type: 'int' }
    },
    supportedActions: ['success', 'failure']
  }),
  invoke: (context, done) => {

    const { variable } = context.properties()
    const { baseCurrency } = context.properties()
    const { targetCurrencies } = context.properties()
    const { amount } = context.properties()
    context.logger().info("Input parameter values: variable: " + variable + ", baseCurrency: " + baseCurrency + ", targetCurrencies: " + targetCurrencies + ", amount: " + amount)

    var tmpTargetCurrencies = targetCurrencies + "," + baseCurrency
    var fixerIoAPIKey = "<replace with your api key>"
    var reqUrl = "http://data.fixer.io/api/latest?access_key=" + fixerIoAPIKey + "&;base=EUR&symbols=" + tmpTargetCurrencies
    //hide  API key from logs
    context.logger().info("fixer.io request URL:" + reqUrl.replace(fixerIoAPIKey, "*********"))

    fetch(reqUrl)
      .then((response) => {
        if (response.status === 200) {
          return response.json()
        } else {
          context.logger().warn("HTTP status code: " + response.statusCode)
          context.transition('failure')
          done()
        }
      })
      .then((data) => {
        context.logger().info("Successful REST call.")
        if (data.success) {
          var _conversionArray = []
          for (let property in data.rates) {
            if (property.toUpperCase() != baseCurrency.toUpperCase()) {
              let _conversionRate = data.rates[property] / data.rates[baseCurrency.toUpperCase()]
              let obj = {}
              obj.symbol = property
              obj.conversionRate = _conversionRate
              obj.amount = _conversionRate * amount
              context.logger().info(baseCurrency.toUpperCase() + " to " + property + "")
              _conversionArray.push(obj)
            }
          }
          context.logger().info("converted currencies: " + _conversionArray.toString())
          let result = {}
          result.date = data.date
          result.base = {}
          result.base.symbol = baseCurrency
          result.base.amount = amount
          result.conversion = _conversionArray

          context.setVariable(variable, result)
          context.transition('success')
          context.keepTurn(true)
        } else {
          if (data.hasOwnProperty("error")) {
            context.logger().warn("Error type: " + data.error.type)
            context.logger().warn("Error message: " + data.error.info)
          }
          context.transition('failure')
        }
        done()
      })
      .catch((err) => {
        done(err)
      }
    );
  }
};