converter/cmd/currency.go

/*
Copyright © 2023 NAME HERE <EMAIL ADDRESS>
*/
package cmd

import (
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strconv"
	"strings"

	"github.com/spf13/cobra"
)

var currencies = []string{
	"USD",
	"AED",
	"AFN",
	"ALL",
	"AMD",
	"ANG",
	"AOA",
	"ARS",
	"AUD",
	"AWG",
	"AZN",
	"BAM",
	"BBD",
	"BDT",
	"BGN",
	"BHD",
	"BIF",
	"BMD",
	"BND",
	"BOB",
	"BRL",
	"BSD",
	"BTN",
	"BWP",
	"BYN",
	"BZD",
	"CAD",
	"CDF",
	"CHF",
	"CLP",
	"CNY",
	"COP",
	"CRC",
	"CUP",
	"CVE",
	"CZK",
	"DJF",
	"DKK",
	"DOP",
	"DZD",
	"EGP",
	"ERN",
	"ETB",
	"EUR",
	"FJD",
	"FKP",
	"FOK",
	"GBP",
	"GEL",
	"GGP",
	"GHS",
	"GIP",
	"GMD",
	"GNF",
	"GTQ",
	"GYD",
	"HKD",
	"HNL",
	"HRK",
	"HTG",
	"HUF",
	"IDR",
	"ILS",
	"IMP",
	"INR",
	"IQD",
	"IRR",
	"ISK",
	"JEP",
	"JMD",
	"JOD",
	"JPY",
	"KES",
	"KGS",
	"KHR",
	"KID",
	"KMF",
	"KRW",
	"KWD",
	"KYD",
	"KZT",
	"LAK",
	"LBP",
	"LKR",
	"LRD",
	"LSL",
	"LYD",
	"MAD",
	"MDL",
	"MGA",
	"MKD",
	"MMK",
	"MNT",
	"MOP",
	"MRU",
	"MUR",
	"MVR",
	"MWK",
	"MXN",
	"MYR",
	"MZN",
	"NAD",
	"NGN",
	"NIO",
	"NOK",
	"NPR",
	"NZD",
	"OMR",
	"PAB",
	"PEN",
	"PGK",
	"PHP",
	"PKR",
	"PLN",
	"PYG",
	"QAR",
	"RON",
	"RSD",
	"RUB",
	"RWF",
	"SAR",
	"SBD",
	"SCR",
	"SDG",
	"SEK",
	"SGD",
	"SHP",
	"SLE",
	"SLL",
	"SOS",
	"SRD",
	"SSP",
	"STN",
	"SYP",
	"SZL",
	"THB",
	"TJS",
	"TMT",
	"TND",
	"TOP",
	"TRY",
	"TTD",
	"TVD",
	"TWD",
	"TZS",
	"UAH",
	"UGX",
	"UYU",
	"UZS",
	"VES",
	"VND",
	"VUV",
	"WST",
	"XAF",
	"XCD",
	"XDR",
	"XOF",
	"XPF",
	"YER",
	"ZAR",
	"ZMW",
	"ZWL",
}

var api_url = "https://open.er-api.com/v6/latest/"

type Response struct {
	Rates map[string]float64
}

// unitsCmd represents the units command
var currencyCmd = &cobra.Command{
	Use:     "currency",
	Aliases: []string{"c", "money"},
	Short:   "converts money",
	Long:    `converts monee`,
	Args:    cobra.MatchAll(cobra.ExactArgs(3), cobra.OnlyValidArgs),
	ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
		if len(args) >= 2 {
			return nil, cobra.ShellCompDirectiveNoFileComp
		}
		return getCurrencyNames(toComplete), cobra.ShellCompDirectiveNoFileComp
	},
	RunE: func(cmd *cobra.Command, args []string) error {
		currencyFrom := args[0]
		currencyTo := args[1]
		amount, err := strconv.ParseFloat(args[2], 64)
		if err != nil {
			return err
		}
		res, err := http.Get(api_url + currencyFrom)
		if err != nil {
			return err
		}
		defer res.Body.Close()
		body, err := io.ReadAll(res.Body)
		if err != nil {
			return err
		}
		var response Response
		json.Unmarshal(body, &response)
		fmt.Println(response.Rates[currencyTo] * amount)
		return nil
	},
}

func getCurrencyNames(in string) []string {
	out := []string{}
	for _, name := range currencies {
		if in == "" {
			out = append(out, name)
		} else {
			if strings.HasPrefix(name, in) {
				out = append(out, name)
			}
		}
	}
	return out
}

func init() {
	rootCmd.AddCommand(currencyCmd)
}