BitcoinMoneyFormatter.php

<?php
 
namespace Money\Formatter;
 
use Money\Currencies;
use Money\Currencies\BitcoinCurrencies;
use Money\Exception\FormatterException;
use Money\Money;
use Money\MoneyFormatter;
use Money\Number;
 
final class BitcoinMoneyFormatter implements MoneyFormatter
{
    private $fractionDigits;
 
    private $currencies;
 
    public function __construct($fractionDigits, Currencies $currencies)
    {
        $this->fractionDigits = $fractionDigits;
        $this->currencies = $currencies;
    }
 
    public function format(Money $money)
    {
        if (BitcoinCurrencies::CODE !== $money->getCurrency()->getCode()) {
            throw new FormatterException('Bitcoin Formatter can only format Bitcoin currency');
        }
 
        $valueBase = $money->getAmount();
        $negative = false;
 
        if ('-' === $valueBase[0]) {
            $negative = true;
            $valueBase = substr($valueBase, 1);
        }
 
        $subunit = $this->currencies->subunitFor($money->getCurrency());
        $valueBase = Number::roundMoneyValue($valueBase, $this->fractionDigits, $subunit);
        $valueLength = strlen($valueBase);
 
        if ($valueLength > $subunit) {
            $formatted = substr($valueBase, 0, $valueLength - $subunit);
 
            if ($subunit) {
                $formatted .= '.';
                $formatted .= substr($valueBase, $valueLength - $subunit);
            }
        } else {
            $formatted = '0.'.str_pad('', $subunit - $valueLength, '0').$valueBase;
        }
 
        if ($this->fractionDigits === 0) {
            $formatted = substr($formatted, 0, strpos($formatted, '.'));
        } elseif ($this->fractionDigits > $subunit) {
            $formatted .= str_pad('', $this->fractionDigits - $subunit, '0');
        } elseif ($this->fractionDigits < $subunit) {
            $lastDigit = strpos($formatted, '.') + $this->fractionDigits + 1;
            $formatted = substr($formatted, 0, $lastDigit);
        }
 
        $formatted = BitcoinCurrencies::SYMBOL.$formatted;
 
        if (true === $negative) {
            $formatted = '-'.$formatted;
        }
 
        return $formatted;
    }
}