//# ----
// Copyright (c) 2014-2016 The Dash Core developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

#include "core_io.h"
#include "main.h"
#include "init.h"

#include "governance.h"
#include "masternode.h"
#include "masternode-budget.h"
#include "darksend.h"
#include "masternodeman.h"
#include "masternode-sync.h"
#include "util.h"
#include "addrman.h"
#include <boost/filesystem.hpp>
#include <boost/lexical_cast.hpp>

CGovernanceManager governator;
CCriticalSection cs_budget;

std::map<uint256, int64_t> askedForSourceProposalOrBudget;
std::vector<CBudgetProposalBroadcast> vecImmatureBudgetProposals;

int nSubmittedFinalBudget;

bool IsCollateralValid(uint256 nTxCollateralHash, uint256 nExpectedHash, std::string& strError, int64_t& nTime, int& nConf, CAmount minFee)
{
    CTransaction txCollateral;
    uint256 nBlockHash;
    if(!GetTransaction(nTxCollateralHash, txCollateral, Params().GetConsensus(), nBlockHash, true)){
        strError = strprintf("Can't find collateral tx %s", txCollateral.ToString());
        LogPrintf ("CBudgetProposalBroadcast::IsCollateralValid - %s\n", strError);
        return false;
    }

    if(txCollateral.vout.size() < 1) return false;
    if(txCollateral.nLockTime != 0) return false;

    CScript findScript;
    findScript << OP_RETURN << ToByteVector(nExpectedHash);

    bool foundOpReturn = false;
    BOOST_FOREACH(const CTxOut o, txCollateral.vout){
        if(!o.scriptPubKey.IsNormalPaymentScript() && !o.scriptPubKey.IsUnspendable()){
            strError = strprintf("Invalid Script %s", txCollateral.ToString());
            LogPrintf ("CBudgetProposalBroadcast::IsCollateralValid - %s\n", strError);
            return false;
        }
        if(o.scriptPubKey == findScript && o.nValue >= minFee) foundOpReturn = true;

    }
    if(!foundOpReturn){
        strError = strprintf("Couldn't find opReturn %s in %s", nExpectedHash.ToString(), txCollateral.ToString());
        LogPrintf ("CBudgetProposalBroadcast::IsCollateralValid - %s\n", strError);
        return false;
    }

    LOCK(cs_main);
    int conf = GetIXConfirmations(nTxCollateralHash);
    if (nBlockHash != uint256()) {
        BlockMap::iterator mi = mapBlockIndex.find(nBlockHash);
        if (mi != mapBlockIndex.end() && (*mi).second) {
            CBlockIndex* pindex = (*mi).second;
            if (chainActive.Contains(pindex)) {
                conf += chainActive.Height() - pindex->nHeight + 1;
                nTime = pindex->nTime;
            }
        }
    }

    nConf = conf;

    //if we're syncing we won't have instantX information, so accept 1 confirmation 
    if(conf >= BUDGET_FEE_CONFIRMATIONS){
        return true;
    } else {
        strError = strprintf("Collateral requires at least %d confirmations - %d confirmations", BUDGET_FEE_CONFIRMATIONS, conf);
        LogPrintf ("CBudgetProposalBroadcast::IsCollateralValid - %s - %d confirmations\n", strError, conf);
        return false;
    }
}

void CGovernanceManager::CheckOrphanVotes()
{
    LOCK(cs);


    std::string strError = "";
    std::map<uint256, CBudgetVote>::iterator it1 = mapOrphanMasternodeBudgetVotes.begin();
    while(it1 != mapOrphanMasternodeBudgetVotes.end()){
        if(UpdateProposal(((*it1).second), NULL, strError)){
            LogPrintf("CGovernanceManager::CheckOrphanVotes - Proposal/Budget is known, activating and removing orphan vote\n");
            mapOrphanMasternodeBudgetVotes.erase(it1++);
        } else {
            ++it1;
        }
    }
}

//
// CBudgetDB
//

CBudgetDB::CBudgetDB()
{
    pathDB = GetDataDir() / "budget.dat";
    strMagicMessage = "MasternodeBudget";
}

bool CBudgetDB::Write(const CGovernanceManager& objToSave)
{
    LOCK(objToSave.cs);

    int64_t nStart = GetTimeMillis();

    // serialize, checksum data up to that point, then append checksum
    CDataStream ssObj(SER_DISK, CLIENT_VERSION);
    ssObj << strMagicMessage; // masternode cache file specific magic message
    ssObj << FLATDATA(Params().MessageStart()); // network specific magic number
    ssObj << objToSave;
    uint256 hash = Hash(ssObj.begin(), ssObj.end());
    ssObj << hash;

    // open output file, and associate with CAutoFile
    FILE *file = fopen(pathDB.string().c_str(), "wb");
    CAutoFile fileout(file, SER_DISK, CLIENT_VERSION);
    if (fileout.IsNull())
        return error("%s : Failed to open file %s", __func__, pathDB.string());

    // Write and commit header, data
    try {
        fileout << ssObj;
    }
    catch (std::exception &e) {
        return error("%s : Serialize or I/O error - %s", __func__, e.what());
    }
    fileout.fclose();

    LogPrintf("Written info to budget.dat  %dms\n", GetTimeMillis() - nStart);
    LogPrintf("Budget manager - %s\n", objToSave.ToString());

    return true;
}

CBudgetDB::ReadResult CBudgetDB::Read(CGovernanceManager& objToLoad, bool fDryRun)
{
    //LOCK(objToLoad.cs);

    int64_t nStart = GetTimeMillis();
    // open input file, and associate with CAutoFile
    FILE *file = fopen(pathDB.string().c_str(), "rb");
    CAutoFile filein(file, SER_DISK, CLIENT_VERSION);
    if (filein.IsNull())
    {
        error("%s : Failed to open file %s", __func__, pathDB.string());
        return FileError;
    }

    // use file size to size memory buffer
    int fileSize = boost::filesystem::file_size(pathDB);
    int dataSize = fileSize - sizeof(uint256);
    // Don't try to resize to a negative number if file is small
    if (dataSize < 0)
        dataSize = 0;
    vector<unsigned char> vchData;
    vchData.resize(dataSize);
    uint256 hashIn;

    // read data and checksum from file
    try {
        filein.read((char *)&vchData[0], dataSize);
        filein >> hashIn;
    }
    catch (std::exception &e) {
        error("%s : Deserialize or I/O error - %s", __func__, e.what());
        return HashReadError;
    }
    filein.fclose();

    CDataStream ssObj(vchData, SER_DISK, CLIENT_VERSION);

    // verify stored checksum matches input data
    uint256 hashTmp = Hash(ssObj.begin(), ssObj.end());
    if (hashIn != hashTmp)
    {
        error("%s : Checksum mismatch, data corrupted", __func__);
        return IncorrectHash;
    }


    unsigned char pchMsgTmp[4];
    std::string strMagicMessageTmp;
    try {
        // de-serialize file header (masternode cache file specific magic message) and ..
        ssObj >> strMagicMessageTmp;

        // ... verify the message matches predefined one
        if (strMagicMessage != strMagicMessageTmp)
        {
            error("%s : Invalid masternode cache magic message", __func__);
            return IncorrectMagicMessage;
        }


        // de-serialize file header (network specific magic number) and ..
        ssObj >> FLATDATA(pchMsgTmp);

        // ... verify the network matches ours
        if (memcmp(pchMsgTmp, Params().MessageStart(), sizeof(pchMsgTmp)))
        {
            error("%s : Invalid network magic number", __func__);
            return IncorrectMagicNumber;
        }

        // de-serialize data into CGovernanceManager object
        ssObj >> objToLoad;
    }
    catch (std::exception &e) {
        objToLoad.Clear();
        error("%s : Deserialize or I/O error - %s", __func__, e.what());
        return IncorrectFormat;
    }

    LogPrintf("Loaded info from budget.dat  %dms\n", GetTimeMillis() - nStart);
    LogPrintf("  %s\n", objToLoad.ToString());
    if(!fDryRun) {
        LogPrintf("Budget manager - cleaning....\n");
        objToLoad.CheckAndRemove();
        LogPrintf("Budget manager - %s\n", objToLoad.ToString());
    }

    return Ok;
}

void DumpBudgets()
{
    int64_t nStart = GetTimeMillis();

    CBudgetDB govdb;
    CGovernanceManager tempBudget;

    LogPrintf("Verifying budget.dat format...\n");
    CBudgetDB::ReadResult readResult = govdb.Read(tempBudget, true);
    // there was an error and it was not an error on file opening => do not proceed
    if (readResult == CBudgetDB::FileError)
        LogPrintf("Missing budgets file - budget.dat, will try to recreate\n");
    else if (readResult != CBudgetDB::Ok)
    {
        LogPrintf("Error reading budget.dat: ");
        if(readResult == CBudgetDB::IncorrectFormat)
            LogPrintf("magic is ok but data has invalid format, will try to recreate\n");
        else
        {
            LogPrintf("file format is unknown or invalid, please fix it manually\n");
            return;
        }
    }
    LogPrintf("Writting info to budget.dat...\n");
    govdb.Write(governator);

    LogPrintf("Budget dump finished  %dms\n", GetTimeMillis() - nStart);
}

bool CGovernanceManager::AddProposal(CBudgetProposal& budgetProposal)
{
    LOCK(cs);
    std::string strError = "";
    if(!budgetProposal.IsValid(pCurrentBlockIndex, strError)) {
        LogPrintf("CGovernanceManager::AddProposal - invalid budget proposal - %s\n", strError);
        return false;
    }

    if(mapProposals.count(budgetProposal.GetHash())) {
        return false;
    }

    mapProposals.insert(make_pair(budgetProposal.GetHash(), budgetProposal));
    return true;
}

void CGovernanceManager::CheckAndRemove()
{
    LogPrintf("CGovernanceManager::CheckAndRemove \n");

    if(!pCurrentBlockIndex) return;

    std::string strError = "";

    std::map<uint256, CBudgetProposal>::iterator it2 = mapProposals.begin();
    while(it2 != mapProposals.end())
    {
        CBudgetProposal* pbudgetProposal = &((*it2).second);
        pbudgetProposal->fValid = pbudgetProposal->IsValid(pCurrentBlockIndex, strError);
        ++it2;
    }
}

CBudgetProposal *CGovernanceManager::FindProposal(const std::string &strProposalName)
{
    //find the prop with the highest yes count

    int nYesCount = -99999;
    CBudgetProposal* pbudgetProposal = NULL;

    std::map<uint256, CBudgetProposal>::iterator it = mapProposals.begin();
    while(it != mapProposals.end()){
        if((*it).second.strProposalName == strProposalName && (*it).second.GetYesCount() > nYesCount){
            pbudgetProposal = &((*it).second);
            nYesCount = pbudgetProposal->GetYesCount();
        }
        ++it;
    }

    if(nYesCount == -99999) return NULL;

    return pbudgetProposal;
}

CBudgetProposal *CGovernanceManager::FindProposal(uint256 nHash)
{
    LOCK(cs);

    if(mapProposals.count(nHash))
        return &mapProposals[nHash];

    return NULL;
}

std::vector<CBudgetProposal*> CGovernanceManager::GetAllProposals()
{
    LOCK(cs);

    std::vector<CBudgetProposal*> vBudgetProposalRet;

    std::map<uint256, CBudgetProposal>::iterator it = mapProposals.begin();
    while(it != mapProposals.end())
    {
        (*it).second.CleanAndRemove(false);

        CBudgetProposal* pbudgetProposal = &((*it).second);
        vBudgetProposalRet.push_back(pbudgetProposal);

        ++it;
    }

    return vBudgetProposalRet;
}

//
// Sort by votes, if there's a tie sort by their feeHash TX
//
struct sortProposalsByVotes {
    bool operator()(const std::pair<CBudgetProposal*, int> &left, const std::pair<CBudgetProposal*, int> &right) {
      if( left.second != right.second)
        return (left.second > right.second);
      return (UintToArith256(left.first->nFeeTXHash) > UintToArith256(right.first->nFeeTXHash));
    }
};

void CGovernanceManager::NewBlock()
{
    TRY_LOCK(cs, fBudgetNewBlock);
    if(!fBudgetNewBlock) return;

    if(!pCurrentBlockIndex) return;

    // todo - 12.1 - add govobj sync
    if (masternodeSync.RequestedMasternodeAssets <= MASTERNODE_SYNC_BUDGET) return;

    //this function should be called 1/6 blocks, allowing up to 100 votes per day on all proposals
    if(pCurrentBlockIndex->nHeight % 6 != 0) return;

    // incremental sync with our peers
    if(masternodeSync.IsSynced()){
        LogPrintf("CGovernanceManager::NewBlock - incremental sync started\n");
        if(pCurrentBlockIndex->nHeight % 600 == rand() % 600) {
            ClearSeen();
            ResetSync();
        }

        LOCK(cs_vNodes);
        BOOST_FOREACH(CNode* pnode, vNodes)
            if(pnode->nVersion >= MIN_BUDGET_PEER_PROTO_VERSION) 
                Sync(pnode, uint256(), true);

        MarkSynced();
    }

    CheckAndRemove();

    //remove invalid votes once in a while (we have to check the signatures and validity of every vote, somewhat CPU intensive)

    std::map<uint256, int64_t>::iterator it = askedForSourceProposalOrBudget.begin();
    while(it != askedForSourceProposalOrBudget.end()){
        if((*it).second > GetTime() - (60*60*24)){
            ++it;
        } else {
            askedForSourceProposalOrBudget.erase(it++);
        }
    }

    std::map<uint256, CBudgetProposal>::iterator it2 = mapProposals.begin();
    while(it2 != mapProposals.end()){
        (*it2).second.CleanAndRemove(false);
        ++it2;
    }

    std::vector<CBudgetProposalBroadcast>::iterator it4 = vecImmatureBudgetProposals.begin();
    while(it4 != vecImmatureBudgetProposals.end())
    {
        std::string strError = "";
        int nConf = 0;
        if(!IsCollateralValid((*it4).nFeeTXHash, (*it4).GetHash(), strError, (*it4).nTime, nConf, GOVERNANCE_FEE_TX)){
            ++it4;
            continue;
        }

        if(!(*it4).IsValid(pCurrentBlockIndex, strError)) {
            LogPrintf("mprop (immature) - invalid budget proposal - %s\n", strError);
            it4 = vecImmatureBudgetProposals.erase(it4); 
            continue;
        }

        CBudgetProposal budgetProposal((*it4));
        if(AddProposal(budgetProposal)) {(*it4).Relay();}

        LogPrintf("mprop (immature) - new budget - %s\n", (*it4).GetHash().ToString());
        it4 = vecImmatureBudgetProposals.erase(it4); 
    }

}

void CGovernanceManager::ProcessMessage(CNode* pfrom, std::string& strCommand, CDataStream& vRecv)
{
    // lite mode is not supported
    if(fLiteMode) return;
    if(!masternodeSync.IsBlockchainSynced()) return;

    LOCK(cs_budget);

    // todo - 12.1 - change to MNGOVERNANCEVOTESYNC
    if (strCommand == NetMsgType::MNBUDGETVOTESYNC) { //Masternode vote sync
        uint256 nProp;
        vRecv >> nProp;

        if(Params().NetworkIDString() == CBaseChainParams::MAIN){
            if(nProp == uint256()) {
                if(pfrom->HasFulfilledRequest(NetMsgType::MNBUDGETVOTESYNC)) {
                    LogPrintf("mnvs - peer already asked me for the list\n");
                    Misbehaving(pfrom->GetId(), 20);
                    return;
                }
                pfrom->FulfilledRequest(NetMsgType::MNBUDGETVOTESYNC);
            }
        }

        Sync(pfrom, nProp);
        LogPrintf("mnvs - Sent Masternode votes to %s\n", pfrom->addr.ToString());
    }

    // todo - 12.1 - change to MNGOVERNANCEPROPOSAL
    if (strCommand == NetMsgType::MNBUDGETPROPOSAL) { //Masternode Proposal
        CBudgetProposalBroadcast budgetProposalBroadcast;
        vRecv >> budgetProposalBroadcast;

        if(mapSeenMasternodeBudgetProposals.count(budgetProposalBroadcast.GetHash())){
            masternodeSync.AddedBudgetItem(budgetProposalBroadcast.GetHash());
            return;
        }

        std::string strError = "";
        int nConf = 0;
        if(!IsCollateralValid(budgetProposalBroadcast.nFeeTXHash, budgetProposalBroadcast.GetHash(), strError, budgetProposalBroadcast.nTime, nConf, GOVERNANCE_FEE_TX)){
            LogPrintf("Proposal FeeTX is not valid - %s - %s\n", budgetProposalBroadcast.nFeeTXHash.ToString(), strError);
            if(nConf >= 1) vecImmatureBudgetProposals.push_back(budgetProposalBroadcast);
            return;
        }

        mapSeenMasternodeBudgetProposals.insert(make_pair(budgetProposalBroadcast.GetHash(), budgetProposalBroadcast));

        if(!budgetProposalBroadcast.IsValid(pCurrentBlockIndex, strError)) {
            LogPrintf("mprop - invalid budget proposal - %s\n", strError);
            return;
        }

        CBudgetProposal budgetProposal(budgetProposalBroadcast);
        if(AddProposal(budgetProposal)) {budgetProposalBroadcast.Relay();}
        masternodeSync.AddedBudgetItem(budgetProposalBroadcast.GetHash());

        LogPrintf("mprop - new budget - %s\n", budgetProposalBroadcast.GetHash().ToString());

        //We might have active votes for this proposal that are valid now
        CheckOrphanVotes();
    }

    // todo - 12.1 - change to MNGOVERNANCEVOTE
    if (strCommand == NetMsgType::MNBUDGETVOTE) { //Masternode Vote
        CBudgetVote vote;
        vRecv >> vote;
        vote.fValid = true;

        if(mapSeenMasternodeBudgetVotes.count(vote.GetHash())){
            masternodeSync.AddedBudgetItem(vote.GetHash());
            return;
        }

        CMasternode* pmn = mnodeman.Find(vote.vin);
        if(pmn == NULL) {
            LogPrint("mnbudget", "mvote - unknown masternode - vin: %s\n", vote.vin.ToString());
            mnodeman.AskForMN(pfrom, vote.vin);
            return;
        }


        mapSeenMasternodeBudgetVotes.insert(make_pair(vote.GetHash(), vote));
        if(!vote.IsValid(true)){
            LogPrintf("mvote - signature invalid\n");
            if(masternodeSync.IsSynced()) Misbehaving(pfrom->GetId(), 20);
            // it could just be a non-synced masternode
            mnodeman.AskForMN(pfrom, vote.vin);
            return;
        }

        std::string strError = "";
        if(UpdateProposal(vote, pfrom, strError)) {
            vote.Relay();
            masternodeSync.AddedBudgetItem(vote.GetHash());
        }

        LogPrintf("mvote - new budget vote - %s\n", vote.GetHash().ToString());
    }

}

//todo - 12.1 - terrible name - maybe DoesObjectExist?
bool CGovernanceManager::PropExists(uint256 nHash)
{
    if(mapProposals.count(nHash)) return true;
    return false;
}

//mark that a full sync is needed
void CGovernanceManager::ResetSync()
{
    LOCK(cs);


    std::map<uint256, CBudgetProposalBroadcast>::iterator it1 = mapSeenMasternodeBudgetProposals.begin();
    while(it1 != mapSeenMasternodeBudgetProposals.end()){
        CBudgetProposal* pbudgetProposal = FindProposal((*it1).first);
        if(pbudgetProposal && pbudgetProposal->fValid){
        
            //mark votes
            std::map<uint256, CBudgetVote>::iterator it2 = pbudgetProposal->mapVotes.begin();
            while(it2 != pbudgetProposal->mapVotes.end()){
                (*it2).second.fSynced = false;
                ++it2;
            }
        }
        ++it1;
    }
}

void CGovernanceManager::MarkSynced()
{
    LOCK(cs);

    /*
        Mark that we've sent all valid items
    */

    std::map<uint256, CBudgetProposalBroadcast>::iterator it1 = mapSeenMasternodeBudgetProposals.begin();
    while(it1 != mapSeenMasternodeBudgetProposals.end()){
        CBudgetProposal* pbudgetProposal = FindProposal((*it1).first);
        if(pbudgetProposal && pbudgetProposal->fValid){
        
            //mark votes
            std::map<uint256, CBudgetVote>::iterator it2 = pbudgetProposal->mapVotes.begin();
            while(it2 != pbudgetProposal->mapVotes.end()){
                if((*it2).second.fValid)
                    (*it2).second.fSynced = true;
                ++it2;
            }
        }
        ++it1;
    }
}


void CGovernanceManager::Sync(CNode* pfrom, uint256 nProp, bool fPartial)
{
    LOCK(cs);

    /*
        Sync with a client on the network

        --

        This code checks each of the hash maps for all known budget proposals and finalized budget proposals, then checks them against the
        budget object to see if they're OK. If all checks pass, we'll send it to the peer.

    */

    int nInvCount = 0;


    // todo - why does this code not always sync properly?
    // the next place this data arrives at is main.cpp:4024 and main.cpp:4030
    std::map<uint256, CBudgetProposalBroadcast>::iterator it1 = mapSeenMasternodeBudgetProposals.begin();
    while(it1 != mapSeenMasternodeBudgetProposals.end()){
        CBudgetProposal* pbudgetProposal = FindProposal((*it1).first);
        if(pbudgetProposal && pbudgetProposal->fValid && (nProp == uint256() || (*it1).first == nProp)){
            // Push the inventory budget proposal message over to the other client
            pfrom->PushInventory(CInv(MSG_BUDGET_PROPOSAL, (*it1).second.GetHash()));
            nInvCount++;
        
            //send votes, at the same time. We should collect votes and store them if we don't have the proposal yet on the other side
            std::map<uint256, CBudgetVote>::iterator it2 = pbudgetProposal->mapVotes.begin();
            while(it2 != pbudgetProposal->mapVotes.end()){
                if((*it2).second.fValid){
                    if((fPartial && !(*it2).second.fSynced) || !fPartial) {
                        pfrom->PushInventory(CInv(MSG_BUDGET_VOTE, (*it2).second.GetHash()));
                        nInvCount++;
                    }
                }
                ++it2;
            }
        }
        ++it1;
    }

    pfrom->PushMessage(NetMsgType::SYNCSTATUSCOUNT, MASTERNODE_SYNC_BUDGET_PROP, nInvCount);

    LogPrintf("CGovernanceManager::Sync - sent %d items\n", nInvCount);
}

bool CGovernanceManager::UpdateProposal(CBudgetVote& vote, CNode* pfrom, std::string& strError)
{
    LOCK(cs);

    if(!mapProposals.count(vote.nProposalHash)){
        if(pfrom){
            // only ask for missing items after our syncing process is complete -- 
            //   otherwise we'll think a full sync succeeded when they return a result
            if(!masternodeSync.IsSynced()) return false;

            LogPrintf("CGovernanceManager::UpdateProposal - Unknown proposal %d, asking for source proposal\n", vote.nProposalHash.ToString());
            mapOrphanMasternodeBudgetVotes[vote.nProposalHash] = vote;

            if(!askedForSourceProposalOrBudget.count(vote.nProposalHash)){
                pfrom->PushMessage(NetMsgType::MNBUDGETVOTESYNC, vote.nProposalHash);
                askedForSourceProposalOrBudget[vote.nProposalHash] = GetTime();
            }
        }

        strError = "Proposal not found!";
        return false;
    }


    return mapProposals[vote.nProposalHash].AddOrUpdateVote(vote, strError);
}

CBudgetProposal::CBudgetProposal()
{
    strProposalName = "unknown";
    nBlockStart = 0;
    nBlockEnd = 0;
    nAmount = 0;
    nTime = 0;
    fValid = true;
}

CBudgetProposal::CBudgetProposal(const CBudgetProposal& other)
{
    strProposalName = other.strProposalName;
    strURL = other.strURL;
    nBlockStart = other.nBlockStart;
    nBlockEnd = other.nBlockEnd;
    address = other.address;
    nAmount = other.nAmount;
    nTime = other.nTime;
    nFeeTXHash = other.nFeeTXHash;
    mapVotes = other.mapVotes;
    fValid = true;
}

CBudgetProposal::CBudgetProposal(std::string strProposalNameIn, std::string strURLIn, int nPaymentCount, CScript addressIn, CAmount nAmountIn, int nBlockStartIn, uint256 nFeeTXHashIn)
{
    strProposalName = strProposalNameIn;
    strURL = strURLIn;

    nBlockStart = nBlockStartIn;

    int nPaymentsStart = nBlockStart - nBlockStart % Params().GetConsensus().nBudgetPaymentsCycleBlocks;
    //calculate the end of the cycle for this vote, add half a cycle (vote will be deleted after that block)
    nBlockEnd = nPaymentsStart + Params().GetConsensus().nBudgetPaymentsCycleBlocks * nPaymentCount;

    address = addressIn;
    nAmount = nAmountIn;

    nFeeTXHash = nFeeTXHashIn;
}

bool CBudgetProposal::IsValid(const CBlockIndex* pindex, std::string& strError, bool fCheckCollateral)
{
    if(GetNoCount() - GetYesCount() > mnodeman.CountEnabled(MIN_BUDGET_PEER_PROTO_VERSION)/10){
         strError = "Active removal";
         return false;
    }

    if(nBlockStart < 0) {
        strError = "Invalid Proposal";
        return false;
    }

    if(!pindex) {
        strError = "Tip is NULL";
        return true;
    }

    if(nBlockStart % Params().GetConsensus().nBudgetPaymentsCycleBlocks != 0){
        int nNext = pindex->nHeight - pindex->nHeight % Params().GetConsensus().nBudgetPaymentsCycleBlocks + Params().GetConsensus().nBudgetPaymentsCycleBlocks;
        strError = strprintf("Invalid block start - must be a budget cycle block. Next valid block: %d", nNext);
        return false;
    }

    if(nBlockEnd % Params().GetConsensus().nBudgetPaymentsCycleBlocks != Params().GetConsensus().nBudgetPaymentsCycleBlocks/2){
        strError = "Invalid block end";
        return false;
    }

    if(nBlockEnd < nBlockStart) {
        strError = "Invalid block end - must be greater then block start.";
        return false;
    }

    if(nAmount < 1*COIN) {
        strError = "Invalid proposal amount";
        return false;
    }

    if(strProposalName.size() > 20) {
        strError = "Invalid proposal name, limit of 20 characters.";
        return false;
    }

    if(strProposalName != SanitizeString(strProposalName)) {
        strError = "Invalid proposal name, unsafe characters found.";
        return false;
    }

    if(strURL.size() > 64) {
        strError = "Invalid proposal url, limit of 64 characters.";
        return false;
    }

    if(strURL != SanitizeString(strURL)) {
        strError = "Invalid proposal url, unsafe characters found.";
        return false;
    }

    if(address == CScript()) {
        strError = "Invalid proposal Payment Address";
        return false;
    }

    if(fCheckCollateral){
        int nConf = 0;
        if(!IsCollateralValid(nFeeTXHash, GetHash(), strError, nTime, nConf, GOVERNANCE_FEE_TX)){
            return false;
        }
    }

    /*
        TODO: There might be an issue with multisig in the coinbase on mainnet, we will add support for it in a future release.
    */
    if(address.IsPayToScriptHash()) {
        strError = "Multisig is not currently supported.";
        return false;
    }

    // -- If GetAbsoluteYesCount is more than -10% of the network, flag as invalid
    if(GetAbsoluteYesCount() < -(mnodeman.CountEnabled(MIN_BUDGET_PEER_PROTO_VERSION)/10)) {
        strError = "Voted Down";
        return false;
    }

    // todo 12.1 - setup a hard limit via spork or something? Maybe up to 1/4 of the total budget?
    //can only pay out 10% of the possible coins (min value of coins)
    if(nAmount > budget.GetTotalBudget(nBlockStart)) {
        strError = "Payment more than max";
        return false;
    }

    if(GetBlockEnd() + Params().GetConsensus().nBudgetPaymentsWindowBlocks < pindex->nHeight) return false;


    return true;
}

bool CBudgetProposal::IsEstablished() {
    //Proposals must be established to make it into a budget
    return (nTime < GetTime() - Params().GetConsensus().nBudgetProposalEstablishingTime);
}

bool CBudgetProposal::AddOrUpdateVote(CBudgetVote& vote, std::string& strError)
{
    LOCK(cs);

    uint256 hash = vote.vin.prevout.GetHash();

    if(mapVotes.count(hash)){
        if(mapVotes[hash].nTime > vote.nTime){
            strError = strprintf("new vote older than existing vote - %s", vote.GetHash().ToString());
            LogPrint("mnbudget", "CBudgetProposal::AddOrUpdateVote - %s\n", strError);
            return false;
        }
        if(vote.nTime - mapVotes[hash].nTime < BUDGET_VOTE_UPDATE_MIN){
            strError = strprintf("time between votes is too soon - %s - %lli", vote.GetHash().ToString(), vote.nTime - mapVotes[hash].nTime);
            LogPrint("mnbudget", "CBudgetProposal::AddOrUpdateVote - %s\n", strError);
            return false;
        }
    }

    mapVotes[hash] = vote;
    return true;
}

// If masternode voted for a proposal, but is now invalid -- remove the vote
void CBudgetProposal::CleanAndRemove(bool fSignatureCheck)
{
    std::map<uint256, CBudgetVote>::iterator it = mapVotes.begin();

    while(it != mapVotes.end()) {
        (*it).second.fValid = (*it).second.IsValid(fSignatureCheck);
        ++it;
    }
}

double CBudgetProposal::GetRatio()
{
    int yeas = 0;
    int nays = 0;

    std::map<uint256, CBudgetVote>::iterator it = mapVotes.begin();

    while(it != mapVotes.end()) {
        if ((*it).second.nVote == VOTE_YES) yeas++;
        if ((*it).second.nVote == VOTE_NO) nays++;
        ++it;
    }

    if(yeas+nays == 0) return 0.0f;

    return ((double)(yeas) / (double)(yeas+nays));
}

int CBudgetProposal::GetAbsoluteYesCount()
{
    return GetYesCount() - GetNoCount();
}

int CBudgetProposal::GetYesCount()
{
    int ret = 0;

    std::map<uint256, CBudgetVote>::iterator it = mapVotes.begin();
    while(it != mapVotes.end()){
        if ((*it).second.nVote == VOTE_YES && (*it).second.fValid) ret++;
        ++it;
    }

    return ret;
}

int CBudgetProposal::GetNoCount()
{
    int ret = 0;

    std::map<uint256, CBudgetVote>::iterator it = mapVotes.begin();
    while(it != mapVotes.end()){
        if ((*it).second.nVote == VOTE_NO && (*it).second.fValid) ret++;
        ++it;
    }

    return ret;
}

int CBudgetProposal::GetAbstainCount()
{
    int ret = 0;

    std::map<uint256, CBudgetVote>::iterator it = mapVotes.begin();
    while(it != mapVotes.end()){
        if ((*it).second.nVote == VOTE_ABSTAIN && (*it).second.fValid) ret++;
        ++it;
    }

    return ret;
}

int CBudgetProposal::GetBlockStartCycle()
{
    //end block is half way through the next cycle (so the proposal will be removed much after the payment is sent)

    return nBlockStart - nBlockStart % Params().GetConsensus().nBudgetPaymentsCycleBlocks;
}

int CBudgetProposal::GetBlockCurrentCycle(const CBlockIndex* pindex)
{
    if(!pindex) return -1;

    if(pindex->nHeight >= GetBlockEndCycle()) return -1;

    return pindex->nHeight - pindex->nHeight % Params().GetConsensus().nBudgetPaymentsCycleBlocks;
}

int CBudgetProposal::GetBlockEndCycle()
{
    //end block is half way through the next cycle (so the proposal will be removed much after the payment is sent)

    return nBlockEnd - Params().GetConsensus().nBudgetPaymentsCycleBlocks/2;
}

int CBudgetProposal::GetTotalPaymentCount()
{
    return (GetBlockEndCycle() - GetBlockStartCycle()) / Params().GetConsensus().nBudgetPaymentsCycleBlocks;
}

int CBudgetProposal::GetRemainingPaymentCount(int nBlockHeight)
{
    int nPayments = 0;
    // printf("-> Budget Name : %s\n", strProposalName.c_str());
    // printf("------- nBlockStart : %d\n", nBlockStart);
    // printf("------- nBlockEnd : %d\n", nBlockEnd);
    while(nBlockHeight + Params().GetConsensus().nBudgetPaymentsCycleBlocks < GetBlockEndCycle())
    {
        // printf("------- P : %d %d - %d < %d - %d\n", nBlockHeight, nPayments, nBlockHeight + Params().GetConsensus().nBudgetPaymentsCycleBlocks, nBlockEnd, nBlockHeight + Params().GetConsensus().nBudgetPaymentsCycleBlocks < nBlockEnd);
        nBlockHeight += Params().GetConsensus().nBudgetPaymentsCycleBlocks;
        nPayments++;
    }
    return nPayments;
}

void CBudgetProposalBroadcast::Relay()
{
    CInv inv(MSG_BUDGET_PROPOSAL, GetHash());
    RelayInv(inv, MIN_BUDGET_PEER_PROTO_VERSION);
}

CBudgetVote::CBudgetVote()
{
    vin = CTxIn();
    nProposalHash = uint256();
    nVote = VOTE_ABSTAIN;
    nTime = 0;
    fValid = true;
    fSynced = false;
}

CBudgetVote::CBudgetVote(CTxIn vinIn, uint256 nProposalHashIn, int nVoteIn)
{
    vin = vinIn;
    nProposalHash = nProposalHashIn;
    nVote = nVoteIn;
    nTime = GetAdjustedTime();
    fValid = true;
    fSynced = false;
}

void CBudgetVote::Relay()
{
    CInv inv(MSG_BUDGET_VOTE, GetHash());
    RelayInv(inv, MIN_BUDGET_PEER_PROTO_VERSION);
}

bool CBudgetVote::Sign(CKey& keyMasternode, CPubKey& pubKeyMasternode)
{
    // Choose coins to use
    CPubKey pubKeyCollateralAddress;
    CKey keyCollateralAddress;

    std::string errorMessage;
    std::string strMessage = vin.prevout.ToStringShort() + nProposalHash.ToString() + boost::lexical_cast<std::string>(nVote) + boost::lexical_cast<std::string>(nTime);

    if(!darkSendSigner.SignMessage(strMessage, errorMessage, vchSig, keyMasternode)) {
        LogPrintf("CBudgetVote::Sign - Error upon calling SignMessage");
        return false;
    }

    if(!darkSendSigner.VerifyMessage(pubKeyMasternode, vchSig, strMessage, errorMessage)) {
        LogPrintf("CBudgetVote::Sign - Error upon calling VerifyMessage");
        return false;
    }

    return true;
}

bool CBudgetVote::IsValid(bool fSignatureCheck)
{
    if(nTime > GetTime() + (60*60)){
        LogPrint("mnbudget", "CBudgetVote::IsValid() - vote is too far ahead of current time - %s - nTime %lli - Max Time %lli\n", GetHash().ToString(), nTime, GetTime() + (60*60));
        return false;
    }

    CMasternode* pmn = mnodeman.Find(vin);

    if(pmn == NULL)
    {
        LogPrint("mnbudget", "CBudgetVote::IsValid() - Unknown Masternode - %s\n", vin.ToString());
        return false;
    }

    if(!fSignatureCheck) return true;

    std::string errorMessage;
    std::string strMessage = vin.prevout.ToStringShort() + nProposalHash.ToString() + boost::lexical_cast<std::string>(nVote) + boost::lexical_cast<std::string>(nTime);

    if(!darkSendSigner.VerifyMessage(pmn->pubkey2, vchSig, strMessage, errorMessage)) {
        LogPrintf("CBudgetVote::IsValid() - Verify message failed - Error: %s\n", errorMessage);
        return false;
    }

    return true;
}

std::string CGovernanceManager::ToString() const
{
    std::ostringstream info;

    info << "Proposals: " << (int)mapProposals.size() <<
            ", Seen Budgets: " << (int)mapSeenMasternodeBudgetProposals.size() <<
            ", Seen Budget Votes: " << (int)mapSeenMasternodeBudgetVotes.size();

    return info.str();
}

void CGovernanceManager::UpdatedBlockTip(const CBlockIndex *pindex)
{
    pCurrentBlockIndex = pindex;
    LogPrint("mnbudget", "pCurrentBlockIndex->nHeight: %d\n", pCurrentBlockIndex->nHeight);

    if(!fLiteMode && masternodeSync.RequestedMasternodeAssets > MASTERNODE_SYNC_LIST)
        NewBlock();
}