// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2021 The Limenka developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#ifndef LIMENKA_CONSENSUS_AMOUNT_H
#define LIMENKA_CONSENSUS_AMOUNT_H

#include <cstdint>

/** Amount in satoshis (Can be negative).
 *  Using __int128 to provide 64 extra bits of sub-satoshi precision,
 *  futureproofing against fiat inflation for the foreseeable future.
 *  COIN = 10^-8 BTC is unchanged; the extra bits sit below satoshis. */
typedef __int128 CAmount;

/** The amount of satoshis in one BTC. */
static constexpr CAmount COIN = 100000000;

/** Attosats per satoshi (10^-18 = 18 decimals of sub-satoshi precision).
 *  CT committed values and the CT kernel fee use attosat units. */
static constexpr CAmount ATTOSATS_PER_SATOSHI = 1000000000000000000;

/** No amount larger than this (in satoshi) is valid.
 *
 * Note that this constant is *not* the total money supply, which in Limenka
 * currently happens to be less than 21,000,000 BTC for various reasons, but
 * rather a sanity check. As this sanity check is used by consensus-critical
 * validation code, the exact value of the MAX_MONEY constant is consensus
 * critical; in unusual circumstances like a(nother) overflow bug that allowed
 * for the creation of coins out of thin air modification could lead to a fork.
 * */
static constexpr CAmount MAX_MONEY = 21000000 * COIN;
inline bool MoneyRange(const CAmount& nValue) { return (nValue >= 0 && nValue <= MAX_MONEY); }

#include <ostream>

/** Stream insertion for __int128 (not provided by standard library). */
inline std::ostream& operator<<(std::ostream& os, const __int128& n) {
    __int128 abs_n = n;
    if (abs_n < 0) { os << '-'; abs_n = -abs_n; }
    char buf[40]; int p = sizeof(buf);
    do { buf[--p] = '0' + static_cast<int>(abs_n % 10); abs_n /= 10; } while (abs_n > 0);
    return os.write(buf + p, sizeof(buf) - p);
}

#endif // LIMENKA_CONSENSUS_AMOUNT_H