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

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

	"github.com/spf13/cobra"
)

type Tokens []struct {
	ID     string `json:"id"`
	Symbol string `json:"symbol"`
	Name   string `json:"name"`
}

type Price map[string]USD

type USD struct {
	Usd float64
}

var (
	price_url  = "https://api.coingecko.com/api/v3/simple/price?"
	vs_url     = "https://api.coingecko.com/api/v3/simple/supported_vs_currencies"
	tokens_url = "https://api.coingecko.com/api/v3/coins/list"
)

var amount float64

// cryptoCmd represents the crypto command
var cryptoCmd = &cobra.Command{
	Use:   "crypto",
	Short: "get price of token",
	Long:  `get price of token`,
	RunE: func(cmd *cobra.Command, args []string) error {
		price, err := usdPrice(args[0])
		if err != nil {
			return err
		}
		price = price * amount
		price2 := float64(1)
		if len(args) >= 2 {
			price2, err = usdPrice(args[1])
			if err != nil {
				return err
			}
		}
		fmt.Println(price / price2)
		return nil
	},
}

func usdPrice(token string) (float64, error) {
	resp, err := http.Get(price_url + fmt.Sprintf("ids=%s&vs_currencies=usd", token))
	if err != nil {
		return 0, err
	}
	defer resp.Body.Close()
	body, err := io.ReadAll(resp.Body)
	if err != nil {
		return 0, err
	}
	var price Price
	err = json.Unmarshal(body, &price)
	if err != nil {
		return 0, err
	}
	return price[token].Usd, nil
}

func init() {
	rootCmd.AddCommand(cryptoCmd)
	cryptoCmd.PersistentFlags().Float64VarP(&amount, "amount", "a", 1, "amount of the given token")
}