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<?php

declare(strict_types=1);

namespace Money\Parser;

use Money\Currencies\BitcoinCurrencies;
use Money\Currency;
use Money\Exception\ParserException;
use Money\Money;
use Money\MoneyParser;

use function ltrim;
use function rtrim;
use function str_pad;
use function str_replace;
use function strlen;
use function strpos;
use function substr;

/**
 * Parses Bitcoin currency to Money.
 */
final class BitcoinMoneyParser implements MoneyParser
{
    public function __construct(private readonly int $fractionDigits)
    {
    }

    public function parse(string $money, Currency|null $fallbackCurrency = null): Money
    {
        if (strpos($money, BitcoinCurrencies::SYMBOL) === false) {
            throw new ParserException('Value cannot be parsed as Bitcoin');
        }

        $currency         = $fallbackCurrency ?? new Currency(BitcoinCurrencies::CODE);
        $decimal          = str_replace(BitcoinCurrencies::SYMBOL, '', $money);
        $decimalSeparator = strpos($decimal, '.');

        if ($decimalSeparator !== false) {
            $decimal       = rtrim($decimal, '0');
            $lengthDecimal = strlen($decimal);
            $decimal       = str_replace('.', '', $decimal);
            $decimal      .= str_pad('', ($lengthDecimal - $decimalSeparator - $this->fractionDigits - 1) * -1, '0');
        } else {
            $decimal .= str_pad('', $this->fractionDigits, '0');
        }

        if (substr($decimal, 0, 1) === '-') {
            $decimal = '-' . ltrim(substr($decimal, 1), '0');
        } else {
            $decimal = ltrim($decimal, '0');
        }

        if ($decimal === '') {
            $decimal = '0';
        }

        /** @psalm-var numeric-string $decimal */
        return new Money($decimal, $currency);
    }
}