// Copyright (c) 2016-2019 The Palladium Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include <bench/bench.h>
#include <coins.h>
#include <policy/policy.h>
#include <script/signingprovider.h>
#include <test/util/transaction_utils.h>

#include <vector>

// Microbenchmark for simple accesses to a CCoinsViewCache database. Note from
// laanwj, "replicating the actual usage patterns of the client is hard though,
// many times micro-benchmarks of the database showed completely different
// characteristics than e.g. reindex timings. But that's not a requirement of
// every benchmark."
// (https://github.com/palladium/palladium/issues/7883#issuecomment-224807484)
static void CCoinsCaching(benchmark::State& state)
{
    FillableSigningProvider keystore;
    CCoinsView coinsDummy;
    CCoinsViewCache coins(&coinsDummy);
    std::vector<CMutableTransaction> dummyTransactions =
        SetupDummyInputs(keystore, coins, {11 * COIN, 50 * COIN, 21 * COIN, 22 * COIN});

    CMutableTransaction t1;
    t1.vin.resize(3);
    t1.vin[0].prevout.hash = dummyTransactions[0].GetHash();
    t1.vin[0].prevout.n = 1;
    t1.vin[0].scriptSig << std::vector<unsigned char>(65, 0);
    t1.vin[1].prevout.hash = dummyTransactions[1].GetHash();
    t1.vin[1].prevout.n = 0;
    t1.vin[1].scriptSig << std::vector<unsigned char>(65, 0) << std::vector<unsigned char>(33, 4);
    t1.vin[2].prevout.hash = dummyTransactions[1].GetHash();
    t1.vin[2].prevout.n = 1;
    t1.vin[2].scriptSig << std::vector<unsigned char>(65, 0) << std::vector<unsigned char>(33, 4);
    t1.vout.resize(2);
    t1.vout[0].nValue = 90 * COIN;
    t1.vout[0].scriptPubKey << OP_1;

    // Benchmark.
    const CTransaction tx_1(t1);
    while (state.KeepRunning()) {
        bool success = AreInputsStandard(tx_1, coins);
        assert(success);
        CAmount value = coins.GetValueIn(tx_1);
        assert(value == (50 + 21 + 22) * COIN);
    }
}

BENCHMARK(CCoinsCaching, 170 * 1000);
