// Copyright (c) 2019-2022 The Bitcoin Core developers

// Distributed under the MIT software license, see the accompanying

// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <chainparams.h>

#include <coins.h>

#include <consensus/tx_check.h>

#include <consensus/tx_verify.h>

#include <consensus/validation.h>

#include <core_io.h>

#include <core_memusage.h>

#include <policy/policy.h>

#include <policy/settings.h>

#include <primitives/transaction.h>

#include <streams.h>

#include <test/fuzz/fuzz.h>

#include <univalue.h>

#include <util/chaintype.h>

#include <util/rbf.h>

#include <validation.h>

#include <cassert>

void initialize_transaction()

{

    SelectParams(ChainType::REGTEST);

}

FUZZ_TARGET(transaction, .init = initialize_transaction)

{

    DataStream ds{buffer};

    bool valid_tx = true;

    const CTransaction tx = [&] {

        try {

            return CTransaction(deserialize, TX_WITH_WITNESS, ds);

        } catch (const std::ios_base::failure&) {

            valid_tx = false;

            return CTransaction{CMutableTransaction{}};

        }

    }();

    bool valid_mutable_tx = true;

    DataStream ds_mtx{buffer};

    CMutableTransaction mutable_tx;

    try {

        ds_mtx >> TX_WITH_WITNESS(mutable_tx);

    } catch (const std::ios_base::failure&) {

        valid_mutable_tx = false;

    }

    assert(valid_tx == valid_mutable_tx);

    if (!valid_tx) {

        return;

    }

    {

        TxValidationState state_with_dupe_check;

        const bool res{CheckTransaction(tx, state_with_dupe_check)};

        Assert(res == state_with_dupe_check.IsValid());

    }

    const CFeeRate dust_relay_fee{DUST_RELAY_TX_FEE};

    std::string reason;

    const bool is_standard_with_permit_bare_multisig = IsStandardTx(tx, std::nullopt, /* permit_bare_multisig= */ true, dust_relay_fee, reason);

    const bool is_standard_without_permit_bare_multisig = IsStandardTx(tx, std::nullopt, /* permit_bare_multisig= */ false, dust_relay_fee, reason);

    if (is_standard_without_permit_bare_multisig) {

        assert(is_standard_with_permit_bare_multisig);

    }

    (void)tx.GetHash();

    (void)tx.GetTotalSize();

    try {

        (void)tx.GetValueOut();

    } catch (const std::runtime_error&) {

    }

    (void)tx.GetWitnessHash();

    (void)tx.HasWitness();

    (void)tx.IsCoinBase();

    (void)tx.IsNull();

    (void)tx.ToString();

    (void)EncodeHexTx(tx);

    (void)GetLegacySigOpCount(tx);

    (void)GetTransactionWeight(tx);

    (void)GetVirtualTransactionSize(tx);

    (void)IsFinalTx(tx, /* nBlockHeight= */ 1024, /* nBlockTime= */ 1024);

    (void)RecursiveDynamicUsage(tx);

    (void)SignalsOptInRBF(tx);

    CCoinsView coins_view;

    const CCoinsViewCache coins_view_cache(&coins_view);

    (void)AreInputsStandard(tx, coins_view_cache);

    (void)IsWitnessStandard(tx, coins_view_cache);

    if (tx.GetTotalSize() < 250'000) { // Avoid high memory usage (with msan) due to json encoding

        {

            UniValue u{UniValue::VOBJ};

            TxToUniv(tx, /*block_hash=*/uint256::ZERO, /*entry=*/u);

        }

        {

            UniValue u{UniValue::VOBJ};

            TxToUniv(tx, /*block_hash=*/uint256::ONE, /*entry=*/u);

        }

    }

}