1// Copyright (c) 2009-2010 Satoshi Nakamoto
2// Copyright (c) 2009-present The Bitcoin Core developers
3// Distributed under the MIT software license, see the accompanying
4// file COPYING or http://www.opensource.org/licenses/mit-license.php.
5
6#include <consensus/amount.h>
7#include <policy/feerate.h>
8#include <tinyformat.h>
9
10#include <cstdlib>
11
12CFeeRate::CFeeRate(const CAmount& nFeePaid, int32_t virtual_bytes)
13{
14    if (virtual_bytes > 0) {
15        m_feerate = FeePerVSize(nFeePaid, virtual_bytes);
16    } else {
17        m_feerate = FeePerVSize();
18    }
19}
20
21CAmount CFeeRate::GetFee(int32_t virtual_bytes) const
22{
23    Assume(virtual_bytes >= 0);
24    if (m_feerate.IsEmpty()) { return CAmount(0);}
25    CAmount nFee = CAmount(m_feerate.EvaluateFeeUp(virtual_bytes));
26    if (nFee == 0 && virtual_bytes != 0 && m_feerate.fee < 0) return CAmount(-1);
27    return nFee;
28}
29
30std::string CFeeRate::ToString(FeeRateFormat fee_rate_format) const
31{
32    const CAmount feerate_per_kvb{GetFeePerK()};
33    const auto format_feerate = [](const CAmount fee_rate, const CAmount divisor, const int decimals, const std::string& currency_unit, const std::string& size_unit) {
34        Assert(divisor > 0);
35        const char* sign{fee_rate < 0 ? "-" : ""};
36        const CAmount quotient{std::abs(fee_rate / divisor)};
37        const CAmount remainder{std::abs(fee_rate % divisor)};
38        return strprintf("%s%d.%0*d %s/%s", sign, quotient, decimals, remainder, currency_unit, size_unit);
39    };
40    switch (fee_rate_format) {
41    case FeeRateFormat::BTC_KVB: return format_feerate(feerate_per_kvb, COIN, /*decimals=*/8, CURRENCY_UNIT, "kvB");
42    case FeeRateFormat::SAT_VB: return format_feerate(feerate_per_kvb, 1000, /*decimals=*/3, CURRENCY_ATOM, "vB");
43    } // no default case, so the compiler can warn about missing cases
44    assert(false);
45}
46