// Copyright (c) 2020 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 <policy/fees.h>
#include <primitives/transaction.h>
#include <test/fuzz/FuzzedDataProvider.h>
#include <test/fuzz/fuzz.h>
#include <test/fuzz/util.h>
#include <txmempool.h>

#include <cstdint>
#include <optional>
#include <string>
#include <vector>

void initialize_policy_estimator()
{
    InitializeFuzzingContext();
}

FUZZ_TARGET_INIT(policy_estimator, initialize_policy_estimator)
{
    FuzzedDataProvider fuzzed_data_provider(buffer.data(), buffer.size());
    CBlockPolicyEstimator block_policy_estimator;
    while (fuzzed_data_provider.ConsumeBool()) {
        switch (fuzzed_data_provider.ConsumeIntegralInRange<int>(0, 3)) {
        case 0: {
            const std::optional<CMutableTransaction> mtx = ConsumeDeserializable<CMutableTransaction>(fuzzed_data_provider);
            if (!mtx) {
                break;
            }
            const CTransaction tx{*mtx};
            block_policy_estimator.processTransaction(ConsumeTxMemPoolEntry(fuzzed_data_provider, tx), fuzzed_data_provider.ConsumeBool());
            if (fuzzed_data_provider.ConsumeBool()) {
                (void)block_policy_estimator.removeTx(tx.GetHash(), /* inBlock */ fuzzed_data_provider.ConsumeBool());
            }
            break;
        }
        case 1: {
            std::vector<CTxMemPoolEntry> mempool_entries;
            while (fuzzed_data_provider.ConsumeBool()) {
                const std::optional<CMutableTransaction> mtx = ConsumeDeserializable<CMutableTransaction>(fuzzed_data_provider);
                if (!mtx) {
                    break;
                }
                const CTransaction tx{*mtx};
                mempool_entries.push_back(ConsumeTxMemPoolEntry(fuzzed_data_provider, tx));
            }
            std::vector<const CTxMemPoolEntry*> ptrs;
            ptrs.reserve(mempool_entries.size());
            for (const CTxMemPoolEntry& mempool_entry : mempool_entries) {
                ptrs.push_back(&mempool_entry);
            }
            block_policy_estimator.processBlock(fuzzed_data_provider.ConsumeIntegral<unsigned int>(), ptrs);
            break;
        }
        case 2: {
            (void)block_policy_estimator.removeTx(ConsumeUInt256(fuzzed_data_provider), /* inBlock */ fuzzed_data_provider.ConsumeBool());
            break;
        }
        case 3: {
            block_policy_estimator.FlushUnconfirmed();
            break;
        }
        }
        (void)block_policy_estimator.estimateFee(fuzzed_data_provider.ConsumeIntegral<int>());
        EstimationResult result;
        (void)block_policy_estimator.estimateRawFee(fuzzed_data_provider.ConsumeIntegral<int>(), fuzzed_data_provider.ConsumeFloatingPoint<double>(), fuzzed_data_provider.PickValueInArray({FeeEstimateHorizon::SHORT_HALFLIFE, FeeEstimateHorizon::MED_HALFLIFE, FeeEstimateHorizon::LONG_HALFLIFE}), fuzzed_data_provider.ConsumeBool() ? &result : nullptr);
        FeeCalculation fee_calculation;
        (void)block_policy_estimator.estimateSmartFee(fuzzed_data_provider.ConsumeIntegral<int>(), fuzzed_data_provider.ConsumeBool() ? &fee_calculation : nullptr, fuzzed_data_provider.ConsumeBool());
        (void)block_policy_estimator.HighestTargetTracked(fuzzed_data_provider.PickValueInArray({FeeEstimateHorizon::SHORT_HALFLIFE, FeeEstimateHorizon::MED_HALFLIFE, FeeEstimateHorizon::LONG_HALFLIFE}));
    }
    {
        FuzzedAutoFileProvider fuzzed_auto_file_provider = ConsumeAutoFile(fuzzed_data_provider);
        CAutoFile fuzzed_auto_file = fuzzed_auto_file_provider.open();
        block_policy_estimator.Write(fuzzed_auto_file);
        block_policy_estimator.Read(fuzzed_auto_file);
    }
}