// Copyright (c) 2010 Satoshi Nakamoto
// Copyright (c) 2009-2020 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 "amount.h"
#include "chainparams.h"
#include "core_io.h"
#include "init.h"
#include "net.h"
#include "main.h"
#include "miner.h"
#include "pow.h"
#include "rpcserver.h"
#include "timedata.h"
#include "util.h"
#include "base58.h"
#include "auxpow.h"
#ifdef ENABLE_WALLET
#include "wallet/db.h"
#include "wallet/wallet.h"
#endif

#include <stdint.h>

#include <boost/assign/list_of.hpp>

#include "univalue/univalue.h"

using namespace std;

/**
 * Return average network hashes per second based on the last 'lookup' blocks,
 * or from the last difficulty change if 'lookup' is nonpositive.
 * If 'height' is nonnegative, compute the estimate at the time when a given block was found.
 */
UniValue GetNetworkHashPS(int lookup, int height) {
    CBlockIndex *pb = chainActive.Tip();

    if (height >= 0 && height < chainActive.Height())
        pb = chainActive[height];

    if (pb == NULL || !pb->nHeight)
        return 0;

    // If lookup is -1, then use blocks since last difficulty change.
    if (lookup <= 0)
        lookup = pb->nHeight % Params().Interval() + 1;

    // If lookup is larger than chain, then set it to chain length.
    if (lookup > pb->nHeight)
        lookup = pb->nHeight;

    CBlockIndex *pb0 = pb;
    int64_t minTime = pb0->GetBlockTime();
    int64_t maxTime = minTime;
    for (int i = 0; i < lookup; i++) {
        pb0 = pb0->pprev;
        int64_t time = pb0->GetBlockTime();
        minTime = std::min(time, minTime);
        maxTime = std::max(time, maxTime);
    }

    // In case there's a situation where minTime == maxTime, we don't want a divide by zero exception.
    if (minTime == maxTime)
        return 0;

    uint256 workDiff = pb->nChainWork - pb0->nChainWork;
    int64_t timeDiff = maxTime - minTime;

    return (int64_t)(workDiff.getdouble() / timeDiff);
}

UniValue getnetworkhashps(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() > 2)
        throw runtime_error(
            "getnetworkhashps ( blocks height )\n"
            "\nReturns the estimated network hashes per second based on the last n blocks.\n"
            "Pass in [blocks] to override # of blocks, -1 specifies since last difficulty change.\n"
            "Pass in [height] to estimate the network speed at the time when a certain block was found.\n"
            "\nArguments:\n"
            "1. blocks     (numeric, optional, default=120) The number of blocks, or -1 for blocks since last difficulty change.\n"
            "2. height     (numeric, optional, default=-1) To estimate at the time of the given height.\n"
            "\nResult:\n"
            "x             (numeric) Hashes per second estimated\n"
            "\nExamples:\n"
            + HelpExampleCli("getnetworkhashps", "")
            + HelpExampleRpc("getnetworkhashps", "")
       );

    LOCK(cs_main);
    return GetNetworkHashPS(params.size() > 0 ? params[0].get_int() : 120, params.size() > 1 ? params[1].get_int() : -1);
}

#ifdef ENABLE_WALLET
UniValue getgenerate(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 0)
        throw runtime_error(
            "getgenerate\n"
            "\nReturn if the server is set to generate coins or not. The default is false.\n"
            "It is set with the command line argument -gen (or unobtanium.conf setting gen)\n"
            "It can also be set with the setgenerate call.\n"
            "\nResult\n"
            "true|false      (boolean) If the server is set to generate coins or not\n"
            "\nExamples:\n"
            + HelpExampleCli("getgenerate", "")
            + HelpExampleRpc("getgenerate", "")
        );

    LOCK(cs_main);
    return GetBoolArg("-gen", false);
}


UniValue setgenerate(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() < 1 || params.size() > 2)
        throw runtime_error(
            "setgenerate generate ( genproclimit )\n"
            "\nSet 'generate' true or false to turn generation on or off.\n"
            "Generation is limited to 'genproclimit' processors, -1 is unlimited.\n"
            "See the getgenerate call for the current setting.\n"
            "\nArguments:\n"
            "1. generate         (boolean, required) Set to true to turn on generation, off to turn off.\n"
            "2. genproclimit     (numeric, optional) Set the processor limit for when generation is on. Can be -1 for unlimited.\n"
            "                    Note: in -regtest mode, genproclimit controls how many blocks are generated immediately.\n"
            "\nResult\n"
            "[ blockhashes ]     (array, -regtest only) hashes of blocks generated\n"
            "\nExamples:\n"
            "\nSet the generation on with a limit of one processor\n"
            + HelpExampleCli("setgenerate", "true 1") +
            "\nCheck the setting\n"
            + HelpExampleCli("getgenerate", "") +
            "\nTurn off generation\n"
            + HelpExampleCli("setgenerate", "false") +
            "\nUsing json rpc\n"
            + HelpExampleRpc("setgenerate", "true, 1")
        );

    if (pwalletMain == NULL)
        throw JSONRPCError(RPC_METHOD_NOT_FOUND, "Method not found (disabled)");

    bool fGenerate = true;
    if (params.size() > 0)
        fGenerate = params[0].get_bool();

    int nGenProcLimit = -1;
    if (params.size() > 1)
    {
        nGenProcLimit = params[1].get_int();
        if (nGenProcLimit == 0)
            fGenerate = false;
    }

    // -regtest mode: don't return until nGenProcLimit blocks are generated
    if (fGenerate && Params().MineBlocksOnDemand())
    {
        int nHeightStart = 0;
        int nHeightEnd = 0;
        int nHeight = 0;
        int nGenerate = (nGenProcLimit > 0 ? nGenProcLimit : 1);
        CReserveKey reservekey(pwalletMain);

        {   // Don't keep cs_main locked
            LOCK(cs_main);
            nHeightStart = chainActive.Height();
            nHeight = nHeightStart;
            nHeightEnd = nHeightStart+nGenerate;
        }
        unsigned int nExtraNonce = 0;
        UniValue blockHashes(UniValue::VARR);
        while (nHeight < nHeightEnd)
        {
            unique_ptr<CBlockTemplate> pblocktemplate(CreateNewBlockWithKey(reservekey));
            if (!pblocktemplate.get())
                throw JSONRPCError(RPC_INTERNAL_ERROR, "Wallet keypool empty");
            CBlock *pblock = &pblocktemplate->block;
            {
                LOCK(cs_main);
                IncrementExtraNonce(pblock, chainActive.Tip(), nExtraNonce);
            }
            while (!CheckBlockProofOfWork(pblock)) {
                // Yes, there is a chance every nonce could fail to satisfy the -regtest
                // target -- 1 in 2^(2^32). That ain't gonna happen.
                ++pblock->nNonce;
            }
            CValidationState state;
            if (!ProcessNewBlock(state, NULL, pblock))
                throw JSONRPCError(RPC_INTERNAL_ERROR, "ProcessNewBlock, block not accepted");
            ++nHeight;
            blockHashes.push_back(pblock->GetHash().GetHex());
        }
        return blockHashes;
    }
    else // Not -regtest: start generate thread, return immediately
    {
        mapArgs["-gen"] = (fGenerate ? "1" : "0");
        mapArgs ["-genproclimit"] = itostr(nGenProcLimit);
        GenerateBitcoins(fGenerate, pwalletMain, nGenProcLimit);
    }

    return NullUniValue;
}
#endif


UniValue getmininginfo(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 0)
        throw runtime_error(
            "getmininginfo\n"
            "\nReturns a json object containing mining-related information."
            "\nResult:\n"
            "{\n"
            "  \"blocks\": nnn,             (numeric) The current block\n"
            "  \"currentblocksize\": nnn,   (numeric) The last block size\n"
            "  \"currentblocktx\": nnn,     (numeric) The last block transaction\n"
            "  \"difficulty\": xxx.xxxxx    (numeric) The current difficulty\n"
            "  \"errors\": \"...\"          (string) Current errors\n"
            "  \"generate\": true|false     (boolean) If the generation is on or off (see getgenerate or setgenerate calls)\n"
            "  \"genproclimit\": n          (numeric) The processor limit for generation. -1 if no generation. (see getgenerate or setgenerate calls)\n"
            "  \"pooledtx\": n              (numeric) The size of the mem pool\n"
            "  \"testnet\": true|false      (boolean) If using testnet or not\n"
            "  \"chain\": \"xxxx\",         (string) current network name as defined in BIP70 (main, test, regtest)\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("getmininginfo", "")
            + HelpExampleRpc("getmininginfo", "")
        );


    LOCK(cs_main);

    UniValue obj(UniValue::VOBJ);
    obj.push_back(Pair("blocks",           (int)chainActive.Height()));
    obj.push_back(Pair("currentblocksize", (uint64_t)nLastBlockSize));
    obj.push_back(Pair("currentblocktx",   (uint64_t)nLastBlockTx));
    obj.push_back(Pair("difficulty",       (double)GetDifficulty()));
    obj.push_back(Pair("errors",           GetWarnings("statusbar")));
    obj.push_back(Pair("genproclimit",     (int)GetArg("-genproclimit", -1)));
    obj.push_back(Pair("networkhashps",    getnetworkhashps(params, false)));
    obj.push_back(Pair("pooledtx",         (uint64_t)mempool.size()));
    obj.push_back(Pair("testnet",          Params().TestnetToBeDeprecatedFieldRPC()));
    obj.push_back(Pair("chain",            Params().NetworkIDString()));
#ifdef ENABLE_WALLET
    obj.push_back(Pair("generate",         getgenerate(params, false)));
#endif
    return obj;
}


// NOTE: Unlike wallet RPC (which use BTC values), mining RPCs follow GBT (BIP 22) in using satoshi amounts
UniValue prioritisetransaction(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 3)
        throw runtime_error(
            "prioritisetransaction <txid> <priority delta> <fee delta>\n"
            "Accepts the transaction into mined blocks at a higher (or lower) priority\n"
            "\nArguments:\n"
            "1. \"txid\"       (string, required) The transaction id.\n"
            "2. priority delta (numeric, required) The priority to add or subtract.\n"
            "                  The transaction selection algorithm considers the tx as it would have a higher priority.\n"
            "                  (priority of a transaction is calculated: coinage * value_in_satoshis / txsize) \n"
            "3. fee delta      (numeric, required) The fee value (in satoshis) to add (or subtract, if negative).\n"
            "                  The fee is not actually paid, only the algorithm for selecting transactions into a block\n"
            "                  considers the transaction as it would have paid a higher (or lower) fee.\n"
            "\nResult\n"
            "true              (boolean) Returns true\n"
            "\nExamples:\n"
            + HelpExampleCli("prioritisetransaction", "\"txid\" 0.0 10000")
            + HelpExampleRpc("prioritisetransaction", "\"txid\", 0.0, 10000")
        );

    LOCK(cs_main);

    uint256 hash = ParseHashStr(params[0].get_str(), "txid");
    CAmount nAmount = params[2].get_int64();

    mempool.PrioritiseTransaction(hash, params[0].get_str(), params[1].get_real(), nAmount);
    return true;
}


// NOTE: Assumes a conclusive result; if result is inconclusive, it must be handled by caller
static UniValue BIP22ValidationResult(const CValidationState& state)
{
    if (state.IsValid())
        return NullUniValue;

    std::string strRejectReason = state.GetRejectReason();
    if (state.IsError())
        throw JSONRPCError(RPC_VERIFY_ERROR, strRejectReason);
    if (state.IsInvalid())
    {
        if (strRejectReason.empty())
            return "rejected";
        return strRejectReason;
    }
    // Should be impossible
    return "valid?";
}

UniValue getblocktemplate(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() > 1)
        throw runtime_error(
            "getblocktemplate ( \"jsonrequestobject\" )\n"
            "\nIf the request parameters include a 'mode' key, that is used to explicitly select between the default 'template' request or a 'proposal'.\n"
            "It returns data needed to construct a block to work on.\n"
            "See https://en.bitcoin.it/wiki/BIP_0022 for full specification.\n"

            "\nArguments:\n"
            "1. \"jsonrequestobject\"       (string, optional) A json object in the following spec\n"
            "     {\n"
            "       \"mode\":\"template\"    (string, optional) This must be set to \"template\" or omitted\n"
            "       \"capabilities\":[       (array, optional) A list of strings\n"
            "           \"support\"           (string) client side supported feature, 'longpoll', 'coinbasetxn', 'coinbasevalue', 'proposal', 'serverlist', 'workid'\n"
            "           ,...\n"
            "         ]\n"
            "     }\n"
            "\n"

            "\nResult:\n"
            "{\n"
            "  \"version\" : n,                    (numeric) The block version\n"
            "  \"previousblockhash\" : \"xxxx\",    (string) The hash of current highest block\n"
            "  \"transactions\" : [                (array) contents of non-coinbase transactions that should be included in the next block\n"
            "      {\n"
            "         \"data\" : \"xxxx\",          (string) transaction data encoded in hexadecimal (byte-for-byte)\n"
            "         \"hash\" : \"xxxx\",          (string) hash/id encoded in little-endian hexadecimal\n"
            "         \"depends\" : [              (array) array of numbers \n"
            "             n                        (numeric) transactions before this one (by 1-based index in 'transactions' list) that must be present in the final block if this one is\n"
            "             ,...\n"
            "         ],\n"
            "         \"fee\": n,                   (numeric) difference in value between transaction inputs and outputs (in Satoshis); for coinbase transactions, this is a negative Number of the total collected block fees (ie, not including the block subsidy); if key is not present, fee is unknown and clients MUST NOT assume there isn't one\n"
            "         \"sigops\" : n,               (numeric) total number of SigOps, as counted for purposes of block limits; if key is not present, sigop count is unknown and clients MUST NOT assume there aren't any\n"
            "         \"required\" : true|false     (boolean) if provided and true, this transaction must be in the final block\n"
            "      }\n"
            "      ,...\n"
            "  ],\n"
            "  \"coinbaseaux\" : {                  (json object) data that should be included in the coinbase's scriptSig content\n"
            "      \"flags\" : \"flags\"            (string) \n"
            "  },\n"
            "  \"coinbasevalue\" : n,               (numeric) maximum allowable input to coinbase transaction, including the generation award and transaction fees (in Satoshis)\n"
            "  \"coinbasetxn\" : { ... },           (json object) information for coinbase transaction\n"
            "  \"target\" : \"xxxx\",               (string) The hash target\n"
            "  \"mintime\" : xxx,                   (numeric) The minimum timestamp appropriate for next block time in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"mutable\" : [                      (array of string) list of ways the block template may be changed \n"
            "     \"value\"                         (string) A way the block template may be changed, e.g. 'time', 'transactions', 'prevblock'\n"
            "     ,...\n"
            "  ],\n"
            "  \"noncerange\" : \"00000000ffffffff\",   (string) A range of valid nonces\n"
            "  \"sigoplimit\" : n,                 (numeric) limit of sigops in blocks\n"
            "  \"sizelimit\" : n,                  (numeric) limit of block size\n"
            "  \"curtime\" : ttt,                  (numeric) current timestamp in seconds since epoch (Jan 1 1970 GMT)\n"
            "  \"bits\" : \"xxx\",                 (string) compressed target of next block\n"
            "  \"height\" : n                      (numeric) The height of the next block\n"
            "}\n"

            "\nExamples:\n"
            + HelpExampleCli("getblocktemplate", "")
            + HelpExampleRpc("getblocktemplate", "")
         );

    LOCK(cs_main);

    std::string strMode = "template";
    UniValue lpval = NullUniValue;
    if (params.size() > 0)
    {
        const UniValue& oparam = params[0].get_obj();
        const UniValue& modeval = find_value(oparam, "mode");
        if (modeval.isStr())
            strMode = modeval.get_str();
        else if (modeval.isNull())
        {
            /* Do nothing */
        }
        else
            throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode");
        lpval = find_value(oparam, "longpollid");

        if (strMode == "proposal")
        {
            const UniValue& dataval = find_value(oparam, "data");
            if (!dataval.isStr())
                throw JSONRPCError(RPC_TYPE_ERROR, "Missing data String key for proposal");

            CBlock block;
            if (!DecodeHexBlk(block, dataval.get_str()))
                throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block decode failed");

            uint256 hash = block.GetHash();
            BlockMap::iterator mi = mapBlockIndex.find(hash);
            if (mi != mapBlockIndex.end()) {
                CBlockIndex *pindex = mi->second;
                if (pindex->IsValid(BLOCK_VALID_SCRIPTS))
                    return "duplicate";
                if (pindex->nStatus & BLOCK_FAILED_MASK)
                    return "duplicate-invalid";
                return "duplicate-inconclusive";
            }

            CBlockIndex* const pindexPrev = chainActive.Tip();
            // TestBlockValidity only supports blocks built on the current Tip
            if (block.hashPrevBlock != pindexPrev->GetBlockHash())
                return "inconclusive-not-best-prevblk";
            CValidationState state;
            TestBlockValidity(state, block, pindexPrev, false, true);
            return BIP22ValidationResult(state);
        }
    }

    if (strMode != "template")
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid mode");

    if (vNodes.empty())
        throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "Unobtanium is not connected!");

    if (IsInitialBlockDownload())
        throw JSONRPCError(RPC_CLIENT_IN_INITIAL_DOWNLOAD, "Unobtanium is downloading blocks...");

    static unsigned int nTransactionsUpdatedLast;

    if (!lpval.isNull())
    {
        // Wait to respond until either the best block changes, OR a minute has passed and there are more transactions
        uint256 hashWatchedChain;
        boost::system_time checktxtime;
        unsigned int nTransactionsUpdatedLastLP;

        if (lpval.isStr())
        {
            // Format: <hashBestChain><nTransactionsUpdatedLast>
            std::string lpstr = lpval.get_str();

            hashWatchedChain.SetHex(lpstr.substr(0, 64));
            nTransactionsUpdatedLastLP = atoi64(lpstr.substr(64));
        }
        else
        {
            // NOTE: Spec does not specify behaviour for non-string longpollid, but this makes testing easier
            hashWatchedChain = chainActive.Tip()->GetBlockHash();
            nTransactionsUpdatedLastLP = nTransactionsUpdatedLast;
        }

        // Release the wallet and main lock while waiting
        LEAVE_CRITICAL_SECTION(cs_main);
        {
            checktxtime = boost::get_system_time() + boost::posix_time::minutes(1);

            boost::unique_lock<boost::mutex> lock(csBestBlock);
            while (chainActive.Tip()->GetBlockHash() == hashWatchedChain && IsRPCRunning())
            {
                if (!cvBlockChange.timed_wait(lock, checktxtime))
                {
                    // Timeout: Check transactions for update
                    if (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLastLP)
                        break;
                    checktxtime += boost::posix_time::seconds(10);
                }
            }
        }
        ENTER_CRITICAL_SECTION(cs_main);

        if (!IsRPCRunning())
            throw JSONRPCError(RPC_CLIENT_NOT_CONNECTED, "Shutting down");
        // TODO: Maybe recheck connections/IBD and (if something wrong) send an expires-immediately template to stop miners?
    }

    // Update block
    static CBlockIndex* pindexPrev;
    static int64_t nStart;
    static CBlockTemplate* pblocktemplate;
    if (pindexPrev != chainActive.Tip() ||
        (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast && GetTime() - nStart > 5))
    {
        // Clear pindexPrev so future calls make a new block, despite any failures from here on
        pindexPrev = NULL;

        // Store the pindexBest used before CreateNewBlock, to avoid races
        nTransactionsUpdatedLast = mempool.GetTransactionsUpdated();
        CBlockIndex* pindexPrevNew = chainActive.Tip();
        nStart = GetTime();

        // Create new block
        if(pblocktemplate)
        {
            delete pblocktemplate;
            pblocktemplate = NULL;
        }
        CScript scriptDummy = CScript() << OP_TRUE;
        pblocktemplate = CreateNewBlock(scriptDummy);
        if (!pblocktemplate)
            throw JSONRPCError(RPC_OUT_OF_MEMORY, "Out of memory");

        // Need to update only after we know CreateNewBlock succeeded
        pindexPrev = pindexPrevNew;
    }
    CBlock* pblock = &pblocktemplate->block; // pointer for convenience

    // Update nTime
    UpdateTime(pblock, pindexPrev);
    pblock->nNonce = 0;

    UniValue aCaps(UniValue::VARR); aCaps.push_back("proposal");

    UniValue transactions(UniValue::VARR);
    map<uint256, int64_t> setTxIndex;
    int i = 0;
    BOOST_FOREACH (CTransaction& tx, pblock->vtx)
    {
        uint256 txHash = tx.GetHash();
        setTxIndex[txHash] = i++;

        if (tx.IsCoinBase())
            continue;

        UniValue entry(UniValue::VOBJ);

        entry.push_back(Pair("data", EncodeHexTx(tx)));

        entry.push_back(Pair("hash", txHash.GetHex()));

        UniValue deps(UniValue::VARR);
        BOOST_FOREACH (const CTxIn &in, tx.vin)
        {
            if (setTxIndex.count(in.prevout.hash))
                deps.push_back(setTxIndex[in.prevout.hash]);
        }
        entry.push_back(Pair("depends", deps));

        int index_in_template = i - 1;
        entry.push_back(Pair("fee", pblocktemplate->vTxFees[index_in_template]));
        entry.push_back(Pair("sigops", pblocktemplate->vTxSigOps[index_in_template]));

        transactions.push_back(entry);
    }

    UniValue aux(UniValue::VOBJ);
    aux.push_back(Pair("flags", HexStr(COINBASE_FLAGS.begin(), COINBASE_FLAGS.end())));

    uint256 hashTarget = uint256().SetCompact(pblock->nBits);

    static UniValue aMutable(UniValue::VARR);
    if (aMutable.empty())
    {
        aMutable.push_back("time");
        aMutable.push_back("transactions");
        aMutable.push_back("prevblock");
    }

    UniValue result(UniValue::VOBJ);
    result.push_back(Pair("capabilities", aCaps));
    result.push_back(Pair("version", pblock->nVersion));
    result.push_back(Pair("previousblockhash", pblock->hashPrevBlock.GetHex()));
    result.push_back(Pair("transactions", transactions));
    result.push_back(Pair("coinbaseaux", aux));
    result.push_back(Pair("coinbasevalue", (int64_t)pblock->vtx[0].vout[0].nValue));
    result.push_back(Pair("longpollid", chainActive.Tip()->GetBlockHash().GetHex() + i64tostr(nTransactionsUpdatedLast)));
    result.push_back(Pair("target", hashTarget.GetHex()));
    result.push_back(Pair("mintime", (int64_t)pindexPrev->GetMedianTimePast()+1));
    result.push_back(Pair("mutable", aMutable));
    result.push_back(Pair("noncerange", "00000000ffffffff"));
    result.push_back(Pair("sigoplimit", (int64_t)MAX_BLOCK_SIGOPS));
    result.push_back(Pair("sizelimit", (int64_t)MAX_BLOCK_SIZE));
    result.push_back(Pair("curtime", pblock->GetBlockTime()));
    result.push_back(Pair("bits", strprintf("%08x", pblock->nBits)));
    result.push_back(Pair("height", (int64_t)(pindexPrev->nHeight+1)));

    return result;
}

class submitblock_StateCatcher : public CValidationInterface
{
public:
    uint256 hash;
    bool found;
    CValidationState state;

    submitblock_StateCatcher(const uint256 &hashIn) : hash(hashIn), found(false), state() {};

protected:
    virtual void BlockChecked(const CBlock& block, const CValidationState& stateIn) {
        if (block.GetHash() != hash)
            return;
        found = true;
        state = stateIn;
    };
};

UniValue submitblock(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() < 1 || params.size() > 2)
        throw runtime_error(
            "submitblock \"hexdata\" ( \"jsonparametersobject\" )\n"
            "\nAttempts to submit new block to network.\n"
            "The 'jsonparametersobject' parameter is currently ignored.\n"
            "See https://en.bitcoin.it/wiki/BIP_0022 for full specification.\n"

            "\nArguments\n"
            "1. \"hexdata\"    (string, required) the hex-encoded block data to submit\n"
            "2. \"jsonparametersobject\"     (string, optional) object of optional parameters\n"
            "    {\n"
            "      \"workid\" : \"id\"    (string, optional) if the server provided a workid, it MUST be included with submissions\n"
            "    }\n"
            "\nResult:\n"
            "\nExamples:\n"
            + HelpExampleCli("submitblock", "\"mydata\"")
            + HelpExampleRpc("submitblock", "\"mydata\"")
        );

    CBlock block;
    if (!DecodeHexBlk(block, params[0].get_str()))
        throw JSONRPCError(RPC_DESERIALIZATION_ERROR, "Block decode failed");

    uint256 hash = block.GetHash();
    BlockMap::iterator mi = mapBlockIndex.find(hash);
    if (mi != mapBlockIndex.end()) {
        CBlockIndex *pindex = mi->second;
        if (pindex->IsValid(BLOCK_VALID_SCRIPTS))
            return "duplicate";
        if (pindex->nStatus & BLOCK_FAILED_MASK)
            return "duplicate-invalid";
        // Otherwise, we might only have the header - process the block before returning
    }

    CValidationState state;
    submitblock_StateCatcher sc(block.GetHash());
    RegisterValidationInterface(&sc);
    bool fAccepted = ProcessNewBlock(state, NULL, &block);
    UnregisterValidationInterface(&sc);
    if (mi != mapBlockIndex.end())
    {
        if (fAccepted && !sc.found)
            return "duplicate-inconclusive";
        return "duplicate";
    }
    if (fAccepted)
    {
        if (!sc.found)
            return "inconclusive";
        state = sc.state;
    }
    return BIP22ValidationResult(state);
}

UniValue estimatefee(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 1)
        throw runtime_error(
            "estimatefee nblocks\n"
            "\nEstimates the approximate fee per kilobyte\n"
            "needed for a transaction to begin confirmation\n"
            "within nblocks blocks.\n"
            "\nArguments:\n"
            "1. nblocks     (numeric)\n"
            "\nResult:\n"
            "n :    (numeric) estimated fee-per-kilobyte\n"
            "\n"
            "-1.0 is returned if not enough transactions and\n"
            "blocks have been observed to make an estimate.\n"
            "\nExample:\n"
            + HelpExampleCli("estimatefee", "6")
            );

    RPCTypeCheck(params, boost::assign::list_of(UniValue::VNUM));

    int nBlocks = params[0].get_int();
    if (nBlocks < 1)
        nBlocks = 1;

    CFeeRate feeRate = mempool.estimateFee(nBlocks);
    if (feeRate == CFeeRate(0))
        return -1.0;

    return ValueFromAmount(feeRate.GetFeePerK());
}

UniValue estimatepriority(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 1)
        throw runtime_error(
            "estimatepriority nblocks\n"
            "\nEstimates the approximate priority\n"
            "a zero-fee transaction needs to begin confirmation\n"
            "within nblocks blocks.\n"
            "\nArguments:\n"
            "1. nblocks     (numeric)\n"
            "\nResult:\n"
            "n :    (numeric) estimated priority\n"
            "\n"
            "-1.0 is returned if not enough transactions and\n"
            "blocks have been observed to make an estimate.\n"
            "\nExample:\n"
            + HelpExampleCli("estimatepriority", "6")
            );

    RPCTypeCheck(params, boost::assign::list_of(UniValue::VNUM));

    int nBlocks = params[0].get_int();
    if (nBlocks < 1)
        nBlocks = 1;

    return mempool.estimatePriority(nBlocks);
}


/* ************************************************************************** */
/* Merge mining.  */

/* The variables below are used to keep track of created and not yet
       submitted auxpow blocks.  Lock them to be sure even for multiple
       RPC threads running in parallel.  */
static std::map<uint256, CBlock*> mapNewBlock;
static std::vector<CBlockTemplate*> vNewBlockTemplate;

static
void AuxMiningCheck()
{
    if (vNodes.empty())
        throw JSONRPCError(-9, "Unobtanium is not connected!");

    if (IsInitialBlockDownload())
        throw JSONRPCError(-10, "Unobtanium is downloading blocks...");

    static CReserveKey reservekey(pwalletMain);
}

static
UniValue _CreateAuxBlock(const CScript& scriptPubKey)
{
    AuxMiningCheck();

    /* Create a new block */
    static unsigned nTransactionsUpdatedLast;
    static CBlockIndex* pindexPrev = NULL;
    static uint64_t nStart;
    static CBlock* pblock = NULL;
    static CBlockTemplate* pblocktemplate;
    // static unsigned nExtraNonce = 0;

    // Update block
    {
    if (pindexPrev != chainActive.Tip()
        || (mempool.GetTransactionsUpdated() != nTransactionsUpdatedLast
            && GetTime() - nStart > 20))
    {
        if (pindexPrev != chainActive.Tip())
        {
            // Clear old blocks since they're obsolete now.
            mapNewBlock.clear();
            BOOST_FOREACH(CBlockTemplate* pblocktemplate, vNewBlockTemplate)
                delete pblocktemplate;
            vNewBlockTemplate.clear();
        }


        nTransactionsUpdatedLast = mempool.GetTransactionsUpdated();
        pindexPrev = chainActive.Tip();
        nStart = GetTime();


        // Create new block with nonce = 0 and extraNonce = 1
        // TODO replace with P2PKH to configured address
        // static const CKeyID keyID = GetAuxpowMiningKey();
        // CScript scriptCoinbase = GetScriptForDestination(keyID);
        pblocktemplate = CreateNewBlock(scriptPubKey);
        if (!pblocktemplate)
            throw JSONRPCError(-7, "Out of memory");

        pblock = &pblocktemplate->block;
            // Update nTime
        pblock->nTime = max(pindexPrev->GetMedianTimePast()+1, GetAdjustedTime());
        pblock->nNonce = 0;

                    // Update nExtraNonce
        static unsigned int nExtraNonce = 0;
        IncrementExtraNonce(pblock, pindexPrev, nExtraNonce);


        // Sets the version
        pblock->SetAuxPow(new CAuxPow());

        // Save
        mapNewBlock[pblock->GetHash()] = pblock;

        vNewBlockTemplate.push_back(pblocktemplate);
    }
    }

    uint256 target;
    target.SetCompact(pblock->nBits);

    UniValue result(UniValue::VOBJ);
    result.push_back(Pair("hash", pblock->GetHash().GetHex()));
    result.push_back(Pair("chainid", pblock->GetChainID()));
    result.push_back(Pair("previousblockhash", pblock->hashPrevBlock.GetHex()));
    result.push_back(Pair("coinbasevalue", (int64_t)pblock->vtx[0].vout[0].nValue));
    result.push_back(Pair("bits", strprintf("%08x", pblock->nBits)));
    result.push_back(Pair("height", static_cast<int64_t> (pindexPrev->nHeight + 1)));
    result.push_back(Pair("_target", HexStr(BEGIN(target), END(target))));

    return result;
}

static
UniValue _SumbitAuxBlock(const std::string& hashHex, const std::string& auxpowHex)
{
    AuxMiningCheck();

    uint256 hash;
    hash.SetHex(hashHex);

    if (!mapNewBlock.count(hash))
        return ::error("stale-work");

    CBlock* pblock = mapNewBlock[hash];

    const std::vector<unsigned char> vchAuxPow = ParseHex(auxpowHex);
    CDataStream ss(vchAuxPow, SER_GETHASH, PROTOCOL_VERSION);
    CAuxPow pow;
    ss >> pow;
    pblock->SetAuxPow(new CAuxPow(pow));

    BlockMap::iterator mi = mapBlockIndex.find(hash);
    if (mi != mapBlockIndex.end()) {
        CBlockIndex *pindex = mi->second;
        if (pindex->IsValid(BLOCK_VALID_SCRIPTS))
            return "duplicate";
        if (pindex->nStatus & BLOCK_FAILED_MASK)
            return "duplicate-invalid";
    }

    CValidationState state;
    submitblock_StateCatcher sc(pblock->GetHash());
    RegisterValidationInterface(&sc);

    bool fAccepted = ProcessNewBlock(state, NULL, pblock);
    UnregisterValidationInterface(&sc);
    if (mi != mapBlockIndex.end())
    {
        if (fAccepted && !sc.found)
            return "duplicate-inconclusive";
        return "duplicate";
    }
    if (fAccepted)
    {
        if (!sc.found)
            return "inconclusive";
        state = sc.state;
    }
    UniValue result(UniValue::VOBJ);
    result = BIP22ValidationResult(state);
    return result.isNull() ? true : result;
}

UniValue getauxblock(const UniValue& params, bool fHelp)
{
    if (fHelp || (params.size() != 0 && params.size() != 2))
        throw runtime_error(
            "getauxblock [<hash> <auxpow>]\n"
            " create a new block"
            "If <hash>, <auxpow> is not specified, returns a new block hash.\n"
            "If <hash>, <auxpow> is specified, tries to solve the block based on "
            "the aux proof of work and returns true if it was successful.");

    /* Create a new block */
    if (params.size() == 0)
    {

        static const CKeyID keyID = GetAuxpowMiningKey();
        CScript scriptCoinbase = GetScriptForDestination(keyID);
        return _CreateAuxBlock(scriptCoinbase);
    }

    /* Submit a block instead.  Note that this need not lock cs_main,
       since ProcessNewBlock below locks it instead.  */
    assert(params.size() == 2);

    return  _SumbitAuxBlock(params[0].get_str(),
                            params[1].get_str());
}

UniValue createauxblock(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 1)
        throw std::runtime_error(
            "createauxblock (address)\n"
            "\ncreate a new block and return information required to merge-mine it.\n"
            "\nArguments:\n"
            "1. address      (string, required) specify coinbase transaction payout address\n"
            "\nResult:\n"
            "{\n"
            "  \"hash\"               (string) hash of the created block\n"
            "  \"chainid\"            (numeric) chain ID for this block\n"
            "  \"previousblockhash\"  (string) hash of the previous block\n"
            "  \"coinbasevalue\"      (numeric) value of the block's coinbase\n"
            "  \"bits\"               (string) compressed target of the block\n"
            "  \"height\"             (numeric) height of the block\n"
            "  \"_target\"            (string) target in reversed byte order, deprecated\n"
            "}\n"
            "\nExamples:\n"
            + HelpExampleCli("createauxblock", "address")
            + HelpExampleRpc("createauxblock", "")
            );

    // Check coinbase payout address
    CScript scriptPubKey;
    CBitcoinAddress coinbaseAddress(params[0].get_str());
    if (!coinbaseAddress.IsValid())
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Invalid coinbase payout address");
    scriptPubKey = GetScriptForDestination(coinbaseAddress.Get());

    return _CreateAuxBlock(scriptPubKey);
}

UniValue submitauxblock(const UniValue& params, bool fHelp)
{
    if (fHelp || params.size() != 2)
        throw std::runtime_error(
            "submitauxblock (hash auxpow)\n"
            "\nsubmit a solved auxpow for a previously block created by 'createauxblock'.\n"
            "\nArguments:\n"
            "1. hash      (string, required) hash of the block to submit\n"
            "2. auxpow    (string, required) serialised auxpow found\n"
            "\nResult:\n"
            "xxxxx        (boolean) whether the submitted block was correct\n"
            "\nExamples:\n"
            + HelpExampleCli("submitauxblock", "\"hash\" \"serialised auxpow\"")
            + HelpExampleRpc("submitauxblock", "")
            );

    return _SumbitAuxBlock(params[0].get_str(),
                           params[1].get_str());
}
