// Copyright (c) 2011-2015 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/consensus.h"
#include "consensus/merkle.h"
#include "consensus/validation.h"
#include "validation.h"
#include "masternode-payments.h"
#include "miner.h"
#include "pubkey.h"
#include "script/standard.h"
#include "txmempool.h"
#include "uint256.h"
#include "util.h"
#include "utilstrencodings.h"

#include "test/test_dash.h"

#include <boost/test/unit_test.hpp>

BOOST_FIXTURE_TEST_SUITE(miner_tests, TestingSetup)

static
struct {
    unsigned char extranonce;
    unsigned int nonce;
} blockinfo[] = {
    {0, 0x009c5477}, {0, 0x00a94582}, {0, 0x00af3d7f}, {0, 0x00d0b721},
    {0, 0x00d53e10}, {0, 0x00f52f0f}, {0, 0x00fb5876}, {0, 0x0117fb12},
    {0, 0x011f930b}, {0, 0x013365d2}, {0, 0x0151737e}, {0, 0x0152cdd0},
    {0, 0x01758d20}, {0, 0x0178d509}, {0, 0x0192103c}, {0, 0x01a3f1b8},
    {0, 0x01abc9c7}, {0, 0x01d2f50c}, {0, 0x01eebad1}, {0, 0x01ef3419},
    {0, 0x01f3f154}, {0, 0x01fa6245}, {0, 0x0224e780}, {0, 0x02281625},
    {0, 0x023a4d10}, {0, 0x0251d3cf}, {0, 0x02555277}, {0, 0x02648a41},
    {0, 0x0280795e}, {0, 0x02a3a585}, {0, 0x02ade34a}, {0, 0x02b02b02},
    {0, 0x02c9dc32}, {0, 0x02da9867}, {0, 0x02e4126e}, {0, 0x02e738c7},
    {0, 0x02f5c6a9}, {0, 0x0307bb0f}, {0, 0x0328ea58}, {0, 0x034fe819},
    {0, 0x036c6fcb}, {0, 0x039b8e11}, {0, 0x039fec90}, {0, 0x03a268ff},
    {0, 0x03d37583}, {0, 0x03d6a9a7}, {0, 0x03e7a013}, {0, 0x03f01ebe},
    {0, 0x0437104d}, {0, 0x043d0af7}, {0, 0x043d824d}, {0, 0x043f50fc},
    {0, 0x044def8c}, {0, 0x0452309a}, {0, 0x04538bd3}, {0, 0x0459286b},
    {0, 0x045bc734}, {0, 0x045c878a}, {0, 0x0485d3ba}, {0, 0x048a64e5},
    {0, 0x048d6ae1}, {0, 0x048dcfec}, {0, 0x049d2c79}, {0, 0x04ade791},
    {0, 0x04b75856}, {0, 0x04c1f89e}, {0, 0x04c2f731}, {0, 0x04ca0376},
    {0, 0x04ca102a}, {0, 0x04cbdfe5}, {0, 0x04cbe35a}, {0, 0x04ccfa95},
    {0, 0x04dcd6e4}, {0, 0x05066d8b}, {0, 0x05150274}, {0, 0x051dcfa0},
    {0, 0x052a4c40}, {0, 0x05310c4e}, {0, 0x05452f69}, {0, 0x05517592},
    {0, 0x05543eb8}, {0, 0x05549dc7}, {0, 0x05732695}, {0, 0x057b00d3},
    {0, 0x0584760d}, {0, 0x059ca419}, {0, 0x05b23b58}, {0, 0x05c69745},
    {0, 0x05e31a12}, {0, 0x05e932d5}, {0, 0x05ef8400}, {0, 0x05f0bdf6},
    {0, 0x05f93997}, {0, 0x05ff2978}, {0, 0x06030233}, {0, 0x0627d615},
    {0, 0x0644a441}, {0, 0x06518661}, {0, 0x06805ef2}, {0, 0x068c43dd},
    {0, 0x069cca16}, {0, 0x06acbf10}, {0, 0x06c2d607}, {0, 0x06d9ea08},
    {0, 0x0700d639}, {0, 0x07083d86}, {0, 0x071cc39d}, {0, 0x072c3cb8},
    {0, 0x07665a0f}, {0, 0x07741214},
};

CBlockIndex CreateBlockIndex(int nHeight)
{
    CBlockIndex index;
    index.nHeight = nHeight;
    index.pprev = chainActive.Tip();
    return index;
}

bool TestSequenceLocks(const CTransaction &tx, int flags)
{
    LOCK(mempool.cs);
    return CheckSequenceLocks(tx, flags);
}

// NOTE: These tests rely on CreateNewBlock doing its own self-validation!
BOOST_AUTO_TEST_CASE(CreateNewBlock_validity)
{
    const CChainParams& chainparams = Params(CBaseChainParams::MAIN);
    CScript scriptPubKey = CScript() << ParseHex("04678afdb0fe5548271967f1a67130b7105cd6a828e03909a67962e0ea1f61deb649f6bc3f4cef38c4f35504e51ec112de5c384df7ba0b8d578a4c702b6bf11d5f") << OP_CHECKSIG;
    CBlockTemplate *pblocktemplate;
    CMutableTransaction tx,tx2;
    CScript script;
    uint256 hash;
    TestMemPoolEntryHelper entry;
    entry.nFee = 11;
    entry.dPriority = 111.0;
    entry.nHeight = 11;

    LOCK(cs_main);
    fCheckpointsEnabled = false;

    // force UpdatedBlockTip to initialize nCachedBlockHeight
    mnpayments.UpdatedBlockTip(chainActive.Tip(), *connman);

    // Simple block creation, nothing special yet:
    BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));

    // We can't make transactions until we have inputs
    // Therefore, load 100 blocks :)
    int baseheight = 0;
    std::vector<CTransaction*>txFirst;
    for (unsigned int i = 0; i < sizeof(blockinfo)/sizeof(*blockinfo); ++i)
    {
        CBlock *pblock = &pblocktemplate->block; // pointer for convenience
        pblock->nVersion = 1;
        pblock->nTime = chainActive.Tip()->GetMedianTimePast()+1;
        CMutableTransaction txCoinbase(pblock->vtx[0]);
        txCoinbase.nVersion = 1;
        txCoinbase.vin[0].scriptSig = CScript();
        txCoinbase.vin[0].scriptSig.push_back(blockinfo[i].extranonce);
        txCoinbase.vin[0].scriptSig.push_back(chainActive.Height());
        txCoinbase.vout[0].scriptPubKey = CScript();
        pblock->vtx[0] = CTransaction(txCoinbase);
        if (txFirst.size() == 0)
            baseheight = chainActive.Height();
        if (txFirst.size() < 4)
            txFirst.push_back(new CTransaction(pblock->vtx[0]));
        pblock->hashMerkleRoot = BlockMerkleRoot(*pblock);
        pblock->nNonce = blockinfo[i].nonce;
        BOOST_CHECK(ProcessNewBlock(chainparams, pblock, true, NULL, NULL));
        pblock->hashPrevBlock = pblock->GetHash();
    }
    delete pblocktemplate;

    // Just to make sure we can still make simple blocks
    BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
    delete pblocktemplate;

    // block sigops > limit: 1000 CHECKMULTISIG + 1
    tx.vin.resize(1);
    // NOTE: OP_NOP is used to force 20 SigOps for the CHECKMULTISIG
    tx.vin[0].scriptSig = CScript() << OP_0 << OP_0 << OP_0 << OP_NOP << OP_CHECKMULTISIG << OP_1;
    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vin[0].prevout.n = 0;
    tx.vout.resize(1);
    tx.vout[0].nValue = 50000000000LL;
    for (unsigned int i = 0; i < 1001; ++i)
    {
        tx.vout[0].nValue -= 1000000;
        hash = tx.GetHash();
        bool spendsCoinbase = (i == 0) ? true : false; // only first tx spends coinbase
        // If we don't set the # of sig ops in the CTxMemPoolEntry, template creation fails
        mempool.addUnchecked(hash, entry.Fee(1000000).Time(GetTime()).SpendsCoinbase(spendsCoinbase).FromTx(tx));
        tx.vin[0].prevout.hash = hash;
    }
    BOOST_CHECK_THROW(CreateNewBlock(chainparams, scriptPubKey), std::runtime_error);
    mempool.clear();

    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vout[0].nValue = 50000000000LL;
    for (unsigned int i = 0; i < 1001; ++i)
    {
        tx.vout[0].nValue -= 1000000;
        hash = tx.GetHash();
        bool spendsCoinbase = (i == 0) ? true : false; // only first tx spends coinbase
        // If we do set the # of sig ops in the CTxMemPoolEntry, template creation passes
        mempool.addUnchecked(hash, entry.Fee(1000000).Time(GetTime()).SpendsCoinbase(spendsCoinbase).SigOps(20).FromTx(tx));
        tx.vin[0].prevout.hash = hash;
    }
    BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
    delete pblocktemplate;
    mempool.clear();

    // block size > limit
    tx.vin[0].scriptSig = CScript();
    // 18 * (520char + DROP) + OP_1 = 9433 bytes
    std::vector<unsigned char> vchData(520);
    for (unsigned int i = 0; i < 18; ++i)
        tx.vin[0].scriptSig << vchData << OP_DROP;
    tx.vin[0].scriptSig << OP_1;
    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vout[0].nValue = 50000000000LL;
    for (unsigned int i = 0; i < 128; ++i)
    {
        tx.vout[0].nValue -= 10000000;
        hash = tx.GetHash();
        bool spendsCoinbase = (i == 0) ? true : false; // only first tx spends coinbase
        mempool.addUnchecked(hash, entry.Fee(1000000).Time(GetTime()).SpendsCoinbase(spendsCoinbase).FromTx(tx));
        tx.vin[0].prevout.hash = hash;
    }
    BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
    delete pblocktemplate;
    mempool.clear();

    // orphan in mempool, template creation fails
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(1000000).Time(GetTime()).FromTx(tx));
    BOOST_CHECK_THROW(CreateNewBlock(chainparams, scriptPubKey), std::runtime_error);
    mempool.clear();

    // child with higher priority than parent
    tx.vin[0].scriptSig = CScript() << OP_1;
    tx.vin[0].prevout.hash = txFirst[1]->GetHash();
    tx.vout[0].nValue = 49000000000LL;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(1000000000LL).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    tx.vin[0].prevout.hash = hash;
    tx.vin.resize(2);
    tx.vin[1].scriptSig = CScript() << OP_1;
    tx.vin[1].prevout.hash = txFirst[0]->GetHash();
    tx.vin[1].prevout.n = 0;
    tx.vout[0].nValue = 59000000000LL;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(4000000000LL).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
    delete pblocktemplate;
    mempool.clear();

    // coinbase in mempool, template creation fails
    tx.vin.resize(1);
    tx.vin[0].prevout.SetNull();
    tx.vin[0].scriptSig = CScript() << OP_0 << OP_1;
    tx.vout[0].nValue = 0;
    hash = tx.GetHash();
    // give it a fee so it'll get mined
    mempool.addUnchecked(hash, entry.Fee(100000).Time(GetTime()).SpendsCoinbase(false).FromTx(tx));
    BOOST_CHECK_THROW(CreateNewBlock(chainparams, scriptPubKey), std::runtime_error);
    mempool.clear();

    // invalid (pre-p2sh) txn in mempool, template creation fails
    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vin[0].prevout.n = 0;
    tx.vin[0].scriptSig = CScript() << OP_1;
    tx.vout[0].nValue = 49000000000LL;
    script = CScript() << OP_0;
    tx.vout[0].scriptPubKey = GetScriptForDestination(CScriptID(script));
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(100000000L).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    tx.vin[0].prevout.hash = hash;
    tx.vin[0].scriptSig = CScript() << std::vector<unsigned char>(script.begin(), script.end());
    tx.vout[0].nValue -= 1000000;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(1000000).Time(GetTime()).SpendsCoinbase(false).FromTx(tx));
    BOOST_CHECK_THROW(CreateNewBlock(chainparams, scriptPubKey), std::runtime_error);
    mempool.clear();

    // double spend txn pair in mempool, template creation fails
    tx.vin[0].prevout.hash = txFirst[0]->GetHash();
    tx.vin[0].scriptSig = CScript() << OP_1;
    tx.vout[0].nValue = 49000000000LL;
    tx.vout[0].scriptPubKey = CScript() << OP_1;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(1000000000L).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    tx.vout[0].scriptPubKey = CScript() << OP_2;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(1000000000L).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    BOOST_CHECK_THROW(CreateNewBlock(chainparams, scriptPubKey), std::runtime_error);
    mempool.clear();

    // subsidy changing
    // int nHeight = chainActive.Height();
    // // Create an actual 209999-long block chain (without valid blocks).
    // while (chainActive.Tip()->nHeight < 209999) {
    //     CBlockIndex* prev = chainActive.Tip();
    //     CBlockIndex* next = new CBlockIndex();
    //     next->phashBlock = new uint256(GetRandHash());
    //     pcoinsTip->SetBestBlock(next->GetBlockHash());
    //     next->pprev = prev;
    //     next->nHeight = prev->nHeight + 1;
    //     next->BuildSkip();
    //     chainActive.SetTip(next);
    // }
    // BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
    // delete pblocktemplate;
    // // Extend to a 210000-long block chain.
    // while (chainActive.Tip()->nHeight < 210000) {
    //     CBlockIndex* prev = chainActive.Tip();
    //     CBlockIndex* next = new CBlockIndex();
    //     next->phashBlock = new uint256(GetRandHash());
    //     pcoinsTip->SetBestBlock(next->GetBlockHash());
    //     next->pprev = prev;
    //     next->nHeight = prev->nHeight + 1;
    //     next->BuildSkip();
    //     chainActive.SetTip(next);
    // }
    // BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
    // delete pblocktemplate;
    // // Delete the dummy blocks again.
    // while (chainActive.Tip()->nHeight > nHeight) {
    //     CBlockIndex* del = chainActive.Tip();
    //     chainActive.SetTip(del->pprev);
    //     pcoinsTip->SetBestBlock(del->pprev->GetBlockHash());
    //     delete del->phashBlock;
    //     delete del;
    // }

    // non-final txs in mempool
    SetMockTime(chainActive.Tip()->GetMedianTimePast()+1);
    int flags = LOCKTIME_VERIFY_SEQUENCE|LOCKTIME_MEDIAN_TIME_PAST;
    // height map
    std::vector<int> prevheights;

    // relative height locked
    tx.nVersion = 2;
    tx.vin.resize(1);
    prevheights.resize(1);
    tx.vin[0].prevout.hash = txFirst[0]->GetHash(); // only 1 transaction
    tx.vin[0].prevout.n = 0;
    tx.vin[0].scriptSig = CScript() << OP_1;
    tx.vin[0].nSequence = chainActive.Tip()->nHeight + 1; // txFirst[0] is the 2nd block
    prevheights[0] = baseheight + 1;
    tx.vout.resize(1);
    tx.vout[0].nValue = 49000000000LL;
    tx.vout[0].scriptPubKey = CScript() << OP_1;
    tx.nLockTime = 0;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Fee(1000000000L).Time(GetTime()).SpendsCoinbase(true).FromTx(tx));
    BOOST_CHECK(CheckFinalTx(tx, flags)); // Locktime passes
    BOOST_CHECK(!TestSequenceLocks(tx, flags)); // Sequence locks fail
    BOOST_CHECK(SequenceLocks(tx, flags, &prevheights, CreateBlockIndex(chainActive.Tip()->nHeight + 2))); // Sequence locks pass on 2nd block

    // relative time locked
    tx.vin[0].prevout.hash = txFirst[1]->GetHash();
    tx.vin[0].nSequence = CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG | (((chainActive.Tip()->GetMedianTimePast()+1-chainActive[1]->GetMedianTimePast()) >> CTxIn::SEQUENCE_LOCKTIME_GRANULARITY) + 1); // txFirst[1] is the 3rd block
    prevheights[0] = baseheight + 2;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
    BOOST_CHECK(CheckFinalTx(tx, flags)); // Locktime passes
    BOOST_CHECK(!TestSequenceLocks(tx, flags)); // Sequence locks fail

    for (int i = 0; i < CBlockIndex::nMedianTimeSpan; i++)
        chainActive.Tip()->GetAncestor(chainActive.Tip()->nHeight - i)->nTime += 512; //Trick the MedianTimePast
    BOOST_CHECK(SequenceLocks(tx, flags, &prevheights, CreateBlockIndex(chainActive.Tip()->nHeight + 1))); // Sequence locks pass 512 seconds later
    for (int i = 0; i < CBlockIndex::nMedianTimeSpan; i++)
        chainActive.Tip()->GetAncestor(chainActive.Tip()->nHeight - i)->nTime -= 512; //undo tricked MTP

    // absolute height locked
    tx.vin[0].prevout.hash = txFirst[2]->GetHash();
    tx.vin[0].nSequence = CTxIn::SEQUENCE_FINAL - 1;
    prevheights[0] = baseheight + 3;
    tx.nLockTime = chainActive.Tip()->nHeight + 1;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
    BOOST_CHECK(!CheckFinalTx(tx, flags)); // Locktime fails
    BOOST_CHECK(TestSequenceLocks(tx, flags)); // Sequence locks pass
    BOOST_CHECK(IsFinalTx(tx, chainActive.Tip()->nHeight + 2, chainActive.Tip()->GetMedianTimePast())); // Locktime passes on 2nd block

    // absolute time locked
    tx.vin[0].prevout.hash = txFirst[3]->GetHash();
    tx.nLockTime = chainActive.Tip()->GetMedianTimePast();
    prevheights.resize(1);
    prevheights[0] = baseheight + 4;
    hash = tx.GetHash();
    mempool.addUnchecked(hash, entry.Time(GetTime()).FromTx(tx));
    BOOST_CHECK(!CheckFinalTx(tx, flags)); // Locktime fails
    BOOST_CHECK(TestSequenceLocks(tx, flags)); // Sequence locks pass
    BOOST_CHECK(IsFinalTx(tx, chainActive.Tip()->nHeight + 2, chainActive.Tip()->GetMedianTimePast() + 1)); // Locktime passes 1 second later

    // mempool-dependent transactions (not added)
    tx.vin[0].prevout.hash = hash;
    prevheights[0] = chainActive.Tip()->nHeight + 1;
    tx.nLockTime = 0;
    tx.vin[0].nSequence = 0;
    BOOST_CHECK(CheckFinalTx(tx, flags)); // Locktime passes
    BOOST_CHECK(TestSequenceLocks(tx, flags)); // Sequence locks pass
    tx.vin[0].nSequence = 1;
    BOOST_CHECK(!TestSequenceLocks(tx, flags)); // Sequence locks fail
    tx.vin[0].nSequence = CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG;
    BOOST_CHECK(TestSequenceLocks(tx, flags)); // Sequence locks pass
    tx.vin[0].nSequence = CTxIn::SEQUENCE_LOCKTIME_TYPE_FLAG | 1;
    BOOST_CHECK(!TestSequenceLocks(tx, flags)); // Sequence locks fail

    BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));

    // None of the of the absolute height/time locked tx should have made
    // it into the template because we still check IsFinalTx in CreateNewBlock,
    // but relative locked txs will if inconsistently added to mempool.
    // For now these will still generate a valid template until BIP68 soft fork
    BOOST_CHECK_EQUAL(pblocktemplate->block.vtx.size(), 3);
    delete pblocktemplate;
    // However if we advance height by 1 and time by 512, all of them should be mined
    for (int i = 0; i < CBlockIndex::nMedianTimeSpan; i++)
        chainActive.Tip()->GetAncestor(chainActive.Tip()->nHeight - i)->nTime += 512; //Trick the MedianTimePast
    chainActive.Tip()->nHeight++;
    SetMockTime(chainActive.Tip()->GetMedianTimePast() + 1);

    BOOST_CHECK(pblocktemplate = CreateNewBlock(chainparams, scriptPubKey));
    BOOST_CHECK_EQUAL(pblocktemplate->block.vtx.size(), 5);
    delete pblocktemplate;

    chainActive.Tip()->nHeight--;
    SetMockTime(0);
    mempool.clear();

    BOOST_FOREACH(CTransaction *tx, txFirst)
        delete tx;

    fCheckpointsEnabled = true;
}

BOOST_AUTO_TEST_SUITE_END()