/*
 * This file is part of the Flowee project
 * Copyright (C) 2009-2010 Satoshi Nakamoto
 * Copyright (C) 2009-2015 The Bitcoin Core developers
 * Copyright (C) 2017-2021 Tom Zander <tom@flowee.org>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "primitives/transaction.h"

#include "hash.h"
#include "tinyformat.h"
#include "utilstrencodings.h"

#include <streaming/streams.h>

CTxIn::CTxIn(COutPoint prevoutIn, CScript scriptSigIn, uint32_t nSequenceIn)
{
    prevout = prevoutIn;
    scriptSig = scriptSigIn;
    nSequence = nSequenceIn;
}

CTxIn::CTxIn(uint256 hashPrevTx, uint32_t nOut, CScript scriptSigIn, uint32_t nSequenceIn)
{
    prevout = COutPoint(hashPrevTx, nOut);
    scriptSig = scriptSigIn;
    nSequence = nSequenceIn;
}

CTxOut::CTxOut(int64_t nValueIn, CScript scriptPubKeyIn)
{
    nValue = nValueIn;
    scriptPubKey = scriptPubKeyIn;
}

uint256 CTxOut::GetHash() const
{
    return SerializeHash(*this);
}

CMutableTransaction::CMutableTransaction() : nVersion(CTransaction::CURRENT_VERSION), nLockTime(0) {}
CMutableTransaction::CMutableTransaction(const CTransaction& tx) : nVersion(tx.nVersion), vin(tx.vin), vout(tx.vout), nLockTime(tx.nLockTime) {}

uint256 CMutableTransaction::GetHash() const
{
    return SerializeHash(*this);
}

void CTransaction::UpdateHash()
{
    hash = SerializeHash(*this);
}

CTransaction::CTransaction() : nVersion(CTransaction::CURRENT_VERSION), vin(), vout(), nLockTime(0) { }

CTransaction::CTransaction(const CMutableTransaction &tx) : nVersion(tx.nVersion), vin(tx.vin), vout(tx.vout), nLockTime(tx.nLockTime) {
    UpdateHash();
}

CTransaction::CTransaction(const CTransaction &other)
    : nVersion(other.nVersion),
    vin(other.vin),
    vout(other.vout),
    nLockTime(other.nLockTime)
{
    hash = other.hash;
}

CTransaction& CTransaction::operator=(const CTransaction &tx) {
    *const_cast<int*>(&nVersion) = tx.nVersion;
    *const_cast<std::vector<CTxIn>*>(&vin) = tx.vin;
    *const_cast<std::vector<CTxOut>*>(&vout) = tx.vout;
    *const_cast<unsigned int*>(&nLockTime) = tx.nLockTime;
    hash = tx.hash;
    return *this;
}

int64_t CTransaction::GetValueOut() const
{
    int64_t nValueOut = 0;
    for (std::vector<CTxOut>::const_iterator it(vout.begin()); it != vout.end(); ++it)
    {
        nValueOut += it->nValue;
        if (!MoneyRange(it->nValue) || !MoneyRange(nValueOut))
            throw std::runtime_error("CTransaction::GetValueOut(): value out of range");
    }
    return nValueOut;
}

double CTransaction::ComputePriority(double dPriorityInputs, unsigned int nTxSize) const
{
    nTxSize = CalculateModifiedSize(nTxSize);
    if (nTxSize == 0) return 0.0;

    return dPriorityInputs / nTxSize;
}

unsigned int CTransaction::CalculateModifiedSize(unsigned int nTxSize) const
{
    // In order to avoid disincentivizing cleaning up the UTXO set we don't count
    // the constant overhead for each txin and up to 110 bytes of scriptSig (which
    // is enough to cover a compressed pubkey p2sh redemption) for priority.
    // Providing any more cleanup incentive than making additional inputs free would
    // risk encouraging people to create junk outputs to redeem later.
    if (nTxSize == 0)
        nTxSize = ::GetSerializeSize(*this, SER_NETWORK, PROTOCOL_VERSION);
    for (std::vector<CTxIn>::const_iterator it(vin.begin()); it != vin.end(); ++it)
    {
        unsigned int offset = 41U + std::min(110U, (unsigned int)it->scriptSig.size());
        if (nTxSize > offset)
            nTxSize -= offset;
    }
    return nTxSize;
}

Log::Item operator<<(Log::Item item, const COutPoint &p) {
    if (item.isEnabled()) {
        const bool old = item.useSpace();
        item.nospace() << "Tx*[" << p.hash << "-" << p.n << ']';
        if (old)
            return item.space();
    }
    return item;
}

Log::Item operator<<(Log::Item item, const CTxOut &out)
{
    if (item.isEnabled()) {
        const bool old = item.useSpace();
        item.nospace() << "Out[" << out.nValue << " sat]";
        if (old)
            return item.space();
    }
    return item;

}

Log::Item operator<<(Log::Item item, const CTxIn &in)
{
    // ok, this may be a bit lazy. But I don't think I'll need anything else, ever.
    return item.maybespace() << in.prevout;
}