#!/usr/bin/env python3

import argparse
import requests


def parse_arguments():
    parser = argparse.ArgumentParser()
    parser.add_argument("coin")
    parser.add_argument("-b", "--base", default="USD")
    parser.add_argument("-r", "--round", type=int, default=2)
    args = parser.parse_args()

    return args

def compute(args):
    coin = args.coin.upper()
    base = args.base.upper()
    round_nb = args.round

    req = requests.get(
        "https://api.coinranking.com/v1/public/coins?base={}&symbols={}".format(
            base, coin
        )
    )
    req_j = req.json()
    data = req_j["data"]
    base_sign = data["base"]["sign"]
    coin_data = data["coins"][0]
    price = float(coin_data["price"])

    return "{} = {}{}".format(coin, base_sign, round(price, round_nb))


print(compute(parse_arguments()))