// Copyright (c) 2019-2021 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 <consensus/merkle.h>

#include <consensus/validation.h>

#include <core_io.h>

#include <core_memusage.h>

#include <primitives/block.h>

#include <pubkey.h>

#include <streams.h>

#include <test/fuzz/fuzz.h>

#include <util/chaintype.h>

#include <validation.h>

#include <cassert>

#include <string>

void initialize_block()

{

    SelectParams(ChainType::REGTEST);

}

FUZZ_TARGET(block, .init = initialize_block)

{

    DataStream ds{buffer};

    CBlock block;

    try {

        ds >> TX_WITH_WITNESS(block);

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

        return;

    }

    const Consensus::Params& consensus_params = Params().GetConsensus();

    BlockValidationState validation_state_pow_and_merkle;

    const bool valid_incl_pow_and_merkle = CheckBlock(block, validation_state_pow_and_merkle, consensus_params, /* fCheckPOW= */ true, /* fCheckMerkleRoot= */ true);

    assert(validation_state_pow_and_merkle.IsValid() || validation_state_pow_and_merkle.IsInvalid() || validation_state_pow_and_merkle.IsError());

    (void)validation_state_pow_and_merkle.Error("");

    BlockValidationState validation_state_pow;

    const bool valid_incl_pow = CheckBlock(block, validation_state_pow, consensus_params, /* fCheckPOW= */ true, /* fCheckMerkleRoot= */ false);

    assert(validation_state_pow.IsValid() || validation_state_pow.IsInvalid() || validation_state_pow.IsError());

    BlockValidationState validation_state_merkle;

    const bool valid_incl_merkle = CheckBlock(block, validation_state_merkle, consensus_params, /* fCheckPOW= */ false, /* fCheckMerkleRoot= */ true);

    assert(validation_state_merkle.IsValid() || validation_state_merkle.IsInvalid() || validation_state_merkle.IsError());

    BlockValidationState validation_state_none;

    const bool valid_incl_none = CheckBlock(block, validation_state_none, consensus_params, /* fCheckPOW= */ false, /* fCheckMerkleRoot= */ false);

    assert(validation_state_none.IsValid() || validation_state_none.IsInvalid() || validation_state_none.IsError());

    if (valid_incl_pow_and_merkle) {

        assert(valid_incl_pow && valid_incl_merkle && valid_incl_none);

    } else if (valid_incl_merkle || valid_incl_pow) {

        assert(valid_incl_none);

    }

    (void)block.GetHash();

    (void)block.ToString();

    (void)BlockMerkleRoot(block);

    if (!block.vtx.empty()) {

        (void)BlockWitnessMerkleRoot(block);

    }

    (void)GetBlockWeight(block);

    (void)GetWitnessCommitmentIndex(block);

    const size_t raw_memory_size = RecursiveDynamicUsage(block);

    const size_t raw_memory_size_as_shared_ptr = RecursiveDynamicUsage(std::make_shared<CBlock>(block));

    assert(raw_memory_size_as_shared_ptr > raw_memory_size);

    CBlock block_copy = block;

    block_copy.SetNull();

    const bool is_null = block_copy.IsNull();

    assert(is_null);

}