#include "transactiontablemodel.h"
#include "guiutil.h"
#include "transactionrecord.h"
#include "guiconstants.h"
#include "transactiondesc.h"
#include "walletmodel.h"
#include "optionsmodel.h"
#include "addresstablemodel.h"
#include "bitcoinunits.h"

#include "headers.h"

#include <QLocale>
#include <QList>
#include <QColor>
#include <QTimer>
#include <QIcon>
#include <QDateTime>
#include <QtAlgorithms>

// Amount column is right-aligned it contains numbers
static int column_alignments[] = {
        Qt::AlignLeft|Qt::AlignVCenter,
        Qt::AlignLeft|Qt::AlignVCenter,
        Qt::AlignLeft|Qt::AlignVCenter,
        Qt::AlignLeft|Qt::AlignVCenter,
        Qt::AlignRight|Qt::AlignVCenter
    };

// Comparison operator for sort/binary search of model tx list
struct TxLessThan
{
    bool operator()(const TransactionRecord &a, const TransactionRecord &b) const
    {
        return a.hash < b.hash;
    }
    bool operator()(const TransactionRecord &a, const uint256 &b) const
    {
        return a.hash < b;
    }
    bool operator()(const uint256 &a, const TransactionRecord &b) const
    {
        return a < b.hash;
    }
};

// Private implementation
struct TransactionTablePriv
{
    TransactionTablePriv(CWallet *wallet, TransactionTableModel *parent):
            wallet(wallet),
            parent(parent)
    {
    }
    CWallet *wallet;
    TransactionTableModel *parent;

    /* Local cache of wallet.
     * As it is in the same order as the CWallet, by definition
     * this is sorted by sha256.
     */
    QList<TransactionRecord> cachedWallet;

    /* Query entire wallet anew from core.
     */
    void refreshWallet()
    {
#ifdef WALLET_UPDATE_DEBUG
        qDebug() << "refreshWallet";
#endif
        cachedWallet.clear();
        CRITICAL_BLOCK(wallet->cs_wallet)
        {
            for(std::map<uint256, CWalletTx>::iterator it = wallet->mapWallet.begin(); it != wallet->mapWallet.end(); ++it)
            {
                cachedWallet.append(TransactionRecord::decomposeTransaction(wallet, it->second));
            }
        }
    }

    /* Update our model of the wallet incrementally, to synchronize our model of the wallet
       with that of the core.

       Call with list of hashes of transactions that were added, removed or changed.
     */
    void updateWallet(const QList<uint256> &updated)
    {
        // Walk through updated transactions, update model as needed.
#ifdef WALLET_UPDATE_DEBUG
        qDebug() << "updateWallet";
#endif
        // Sort update list, and iterate through it in reverse, so that model updates
        //  can be emitted from end to beginning (so that earlier updates will not influence
        // the indices of latter ones).
        QList<uint256> updated_sorted = updated;
        qSort(updated_sorted);

        CRITICAL_BLOCK(wallet->cs_wallet)
        {
            for(int update_idx = updated_sorted.size()-1; update_idx >= 0; --update_idx)
            {
                const uint256 &hash = updated_sorted.at(update_idx);
                // Find transaction in wallet
                std::map<uint256, CWalletTx>::iterator mi = wallet->mapWallet.find(hash);
                bool inWallet = mi != wallet->mapWallet.end();
                // Find bounds of this transaction in model
                QList<TransactionRecord>::iterator lower = qLowerBound(
                    cachedWallet.begin(), cachedWallet.end(), hash, TxLessThan());
                QList<TransactionRecord>::iterator upper = qUpperBound(
                    cachedWallet.begin(), cachedWallet.end(), hash, TxLessThan());
                int lowerIndex = (lower - cachedWallet.begin());
                int upperIndex = (upper - cachedWallet.begin());

                // Determine if transaction is in model already
                bool inModel = false;
                if(lower != upper)
                {
                    inModel = true;
                }

#ifdef WALLET_UPDATE_DEBUG
                qDebug() << "  " << QString::fromStdString(hash.ToString()) << inWallet << " " << inModel
                        << lowerIndex << "-" << upperIndex;
#endif

                if(inWallet && !inModel)
                {
                    // Added -- insert at the right position
                    QList<TransactionRecord> toInsert =
                            TransactionRecord::decomposeTransaction(wallet, mi->second);
                    if(!toInsert.isEmpty()) /* only if something to insert */
                    {
                        parent->beginInsertRows(QModelIndex(), lowerIndex, lowerIndex+toInsert.size()-1);
                        int insert_idx = lowerIndex;
                        foreach(const TransactionRecord &rec, toInsert)
                        {
                            cachedWallet.insert(insert_idx, rec);
                            insert_idx += 1;
                        }
                        parent->endInsertRows();
                    }
                }
                else if(!inWallet && inModel)
                {
                    // Removed -- remove entire transaction from table
                    parent->beginRemoveRows(QModelIndex(), lowerIndex, upperIndex-1);
                    cachedWallet.erase(lower, upper);
                    parent->endRemoveRows();
                }
                else if(inWallet && inModel)
                {
                    // Updated -- nothing to do, status update will take care of this
                }
            }
        }
    }

    int size()
    {
        return cachedWallet.size();
    }

    TransactionRecord *index(int idx)
    {
        if(idx >= 0 && idx < cachedWallet.size())
        {
            TransactionRecord *rec = &cachedWallet[idx];

            // If a status update is needed (blocks came in since last check),
            //  update the status of this transaction from the wallet. Otherwise,
            // simply re-use the cached status.
            if(rec->statusUpdateNeeded())
            {
                CRITICAL_BLOCK(wallet->cs_wallet)
                {
                    std::map<uint256, CWalletTx>::iterator mi = wallet->mapWallet.find(rec->hash);

                    if(mi != wallet->mapWallet.end())
                    {
                        rec->updateStatus(mi->second);
                    }
                }
            }
            return rec;
        }
        else
        {
            return 0;
        }
    }

    QString describe(TransactionRecord *rec)
    {
        CRITICAL_BLOCK(wallet->cs_wallet)
        {
            std::map<uint256, CWalletTx>::iterator mi = wallet->mapWallet.find(rec->hash);
            if(mi != wallet->mapWallet.end())
            {
                return TransactionDesc::toHTML(wallet, mi->second);
            }
        }
        return QString("");
    }

};

TransactionTableModel::TransactionTableModel(CWallet* wallet, WalletModel *parent):
        QAbstractTableModel(parent),
        wallet(wallet),
        walletModel(parent),
        priv(new TransactionTablePriv(wallet, this))
{
    columns << QString() << tr("Date") << tr("Type") << tr("Address") << tr("Amount");

    priv->refreshWallet();

    QTimer *timer = new QTimer(this);
    connect(timer, SIGNAL(timeout()), this, SLOT(update()));
    timer->start(MODEL_UPDATE_DELAY);
}

TransactionTableModel::~TransactionTableModel()
{
    delete priv;
}

void TransactionTableModel::update()
{
    QList<uint256> updated;

    // Check if there are changes to wallet map
    TRY_CRITICAL_BLOCK(wallet->cs_wallet)
    {
        if(!wallet->vWalletUpdated.empty())
        {
            BOOST_FOREACH(uint256 hash, wallet->vWalletUpdated)
            {
                updated.append(hash);
            }
            wallet->vWalletUpdated.clear();
        }
    }

    if(!updated.empty())
    {
        priv->updateWallet(updated);

        // Status (number of confirmations) and (possibly) description
        //  columns changed for all rows.
        emit dataChanged(index(0, Status), index(priv->size()-1, Status));
        emit dataChanged(index(0, ToAddress), index(priv->size()-1, ToAddress));
    }
}

int TransactionTableModel::rowCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent);
    return priv->size();
}

int TransactionTableModel::columnCount(const QModelIndex &parent) const
{
    Q_UNUSED(parent);
    return columns.length();
}

QString TransactionTableModel::formatTxStatus(const TransactionRecord *wtx) const
{
    QString status;

    switch(wtx->status.status)
    {
    case TransactionStatus::OpenUntilBlock:
        status = tr("Open for %n block(s)","",wtx->status.open_for);
        break;
    case TransactionStatus::OpenUntilDate:
        status = tr("Open until %1").arg(GUIUtil::dateTimeStr(wtx->status.open_for));
        break;
    case TransactionStatus::Offline:
        status = tr("Offline (%1 confirmations)").arg(wtx->status.depth);
        break;
    case TransactionStatus::Unconfirmed:
        status = tr("Unconfirmed (%1 of %2 confirmations)").arg(wtx->status.depth).arg(TransactionRecord::NumConfirmations);
        break;
    case TransactionStatus::HaveConfirmations:
        status = tr("Confirmed (%1 confirmations)").arg(wtx->status.depth);
        break;
    }
    if(wtx->type == TransactionRecord::Generated)
    {
        switch(wtx->status.maturity)
        {
        case TransactionStatus::Immature:
            status += "\n" + tr("Mined balance will be available in %n more blocks", "",
                           wtx->status.matures_in);
            break;
        case TransactionStatus::Mature:
            break;
        case TransactionStatus::MaturesWarning:
            status += "\n" + tr("This block was not received by any other nodes and will probably not be accepted!");
            break;
        case TransactionStatus::NotAccepted:
            status += "\n" + tr("Generated but not accepted");
            break;
        }
    }

    return status;
}

QString TransactionTableModel::formatTxDate(const TransactionRecord *wtx) const
{
    if(wtx->time)
    {
        return GUIUtil::dateTimeStr(wtx->time);
    }
    else
    {
        return QString();
    }
}

/* Look up address in address book, if found return label (address)
   otherwise just return (address)
 */
QString TransactionTableModel::lookupAddress(const std::string &address, bool tooltip) const
{
    QString label = walletModel->getAddressTableModel()->labelForAddress(QString::fromStdString(address));
    QString description;
    if(!label.isEmpty())
    {
        description += label + QString(" ");
    }
    if(label.isEmpty() || walletModel->getOptionsModel()->getDisplayAddresses() || tooltip)
    {
        description += QString("(") + QString::fromStdString(address) + QString(")");
    }
    return description;
}

QString TransactionTableModel::formatTxType(const TransactionRecord *wtx) const
{
    switch(wtx->type)
    {
    case TransactionRecord::RecvWithAddress:
        return tr("Received with");
    case TransactionRecord::RecvFromOther:
        return tr("Received from");
    case TransactionRecord::SendToAddress:
    case TransactionRecord::SendToOther:
        return tr("Sent to");
    case TransactionRecord::SendToSelf:
        return tr("Payment to yourself");
    case TransactionRecord::Generated:
        return tr("Mined");
    default:
        return QString();
    }
}

QVariant TransactionTableModel::txAddressDecoration(const TransactionRecord *wtx) const
{
    switch(wtx->type)
    {
    case TransactionRecord::Generated:
        return QIcon(":/icons/tx_mined");
    case TransactionRecord::RecvWithAddress:
    case TransactionRecord::RecvFromOther:
        return QIcon(":/icons/tx_input");
    case TransactionRecord::SendToAddress:
    case TransactionRecord::SendToOther:
        return QIcon(":/icons/tx_output");
    default:
        return QIcon(":/icons/tx_inout");
    }
    return QVariant();
}

QString TransactionTableModel::formatTxToAddress(const TransactionRecord *wtx, bool tooltip) const
{
    switch(wtx->type)
    {
    case TransactionRecord::RecvFromOther:
        return QString::fromStdString(wtx->address);
    case TransactionRecord::RecvWithAddress:
    case TransactionRecord::SendToAddress:
        return lookupAddress(wtx->address, tooltip);
    case TransactionRecord::SendToOther:
        return QString::fromStdString(wtx->address);
    case TransactionRecord::SendToSelf:
    case TransactionRecord::Generated:
    default:
        return tr("(n/a)");
    }
}

QVariant TransactionTableModel::addressColor(const TransactionRecord *wtx) const
{
    // Show addresses without label in a less visible color
    switch(wtx->type)
    {
    case TransactionRecord::RecvWithAddress:
    case TransactionRecord::SendToAddress:
        {
        QString label = walletModel->getAddressTableModel()->labelForAddress(QString::fromStdString(wtx->address));
        if(label.isEmpty())
            return COLOR_BAREADDRESS;
        } break;
    case TransactionRecord::SendToSelf:
    case TransactionRecord::Generated:
        return COLOR_BAREADDRESS;
    default:
        break;
    }
    return QVariant();
}

QString TransactionTableModel::formatTxAmount(const TransactionRecord *wtx, bool showUnconfirmed) const
{
    QString str = BitcoinUnits::format(walletModel->getOptionsModel()->getDisplayUnit(), wtx->credit + wtx->debit);
    if(showUnconfirmed)
    {
        if(!wtx->status.confirmed || wtx->status.maturity != TransactionStatus::Mature)
        {
            str = QString("[") + str + QString("]");
        }
    }
    return QString(str);
}

QVariant TransactionTableModel::txStatusDecoration(const TransactionRecord *wtx) const
{
    if(wtx->type == TransactionRecord::Generated)
    {
        switch(wtx->status.maturity)
        {
        case TransactionStatus::Immature: {
            int total = wtx->status.depth + wtx->status.matures_in;
            int part = (wtx->status.depth * 4 / total) + 1;
            return QIcon(QString(":/icons/transaction_%1").arg(part));
            }
        case TransactionStatus::Mature:
            return QIcon(":/icons/transaction_confirmed");
        case TransactionStatus::MaturesWarning:
        case TransactionStatus::NotAccepted:
            return QIcon(":/icons/transaction_0");
        }
    }
    else
    {
        switch(wtx->status.status)
        {
        case TransactionStatus::OpenUntilBlock:
        case TransactionStatus::OpenUntilDate:
            return QColor(64,64,255);
            break;
        case TransactionStatus::Offline:
            return QColor(192,192,192);
        case TransactionStatus::Unconfirmed:
            switch(wtx->status.depth)
            {
            case 0: return QIcon(":/icons/transaction_0");
            case 1: return QIcon(":/icons/transaction_1");
            case 2: return QIcon(":/icons/transaction_2");
            case 3: return QIcon(":/icons/transaction_3");
            case 4: return QIcon(":/icons/transaction_4");
            default: return QIcon(":/icons/transaction_5");
            };
        case TransactionStatus::HaveConfirmations:
            return QIcon(":/icons/transaction_confirmed");
        }
    }
    return QColor(0,0,0);
}

QString TransactionTableModel::formatTooltip(const TransactionRecord *rec) const
{
    QString tooltip = formatTxStatus(rec) + QString("\n") + formatTxType(rec);
    if(rec->type==TransactionRecord::RecvFromOther || rec->type==TransactionRecord::SendToOther ||
       rec->type==TransactionRecord::SendToAddress || rec->type==TransactionRecord::RecvWithAddress)
    {
        tooltip += QString(" ") + formatTxToAddress(rec, true);
    }
    return tooltip;
}

QVariant TransactionTableModel::data(const QModelIndex &index, int role) const
{
    if(!index.isValid())
        return QVariant();
    TransactionRecord *rec = static_cast<TransactionRecord*>(index.internalPointer());

    switch(role)
    {
    case Qt::DecorationRole:
        switch(index.column())
        {
        case Status:
            return txStatusDecoration(rec);
        case ToAddress:
            return txAddressDecoration(rec);
        }
        break;
    case Qt::DisplayRole:
        switch(index.column())
        {
        case Date:
            return formatTxDate(rec);
        case Type:
            return formatTxType(rec);
        case ToAddress:
            return formatTxToAddress(rec, false);
        case Amount:
            return formatTxAmount(rec);
        }
        break;
    case Qt::EditRole:
        // Edit role is used for sorting, so return the unformatted values
        switch(index.column())
        {
        case Status:
            return QString::fromStdString(rec->status.sortKey);
        case Date:
            return rec->time;
        case Type:
            return formatTxType(rec);
        case ToAddress:
            return formatTxToAddress(rec, true);
        case Amount:
            return rec->credit + rec->debit;
        }
        break;
    case Qt::ToolTipRole:
        return formatTooltip(rec);
    case Qt::TextAlignmentRole:
        return column_alignments[index.column()];
    case Qt::ForegroundRole:
        // Non-confirmed transactions are grey
        if(!rec->status.confirmed)
        {
            return COLOR_UNCONFIRMED;
        }
        if(index.column() == Amount && (rec->credit+rec->debit) < 0)
        {
            return COLOR_NEGATIVE;
        }
        if(index.column() == ToAddress)
        {
            return addressColor(rec);
        }
        break;
    case TypeRole:
        return rec->type;
    case DateRole:
        return QDateTime::fromTime_t(static_cast<uint>(rec->time));
    case LongDescriptionRole:
        return priv->describe(rec);
    case AddressRole:
        return QString::fromStdString(rec->address);
    case LabelRole:
        return walletModel->getAddressTableModel()->labelForAddress(QString::fromStdString(rec->address));
    case AmountRole:
        return rec->credit + rec->debit;
    case TxIDRole:
        return QString::fromStdString(rec->getTxID());
    case ConfirmedRole:
        // Return True if transaction counts for balance
        return rec->status.confirmed && !(rec->type == TransactionRecord::Generated &&
                                          rec->status.maturity != TransactionStatus::Mature);
    case FormattedAmountRole:
        return formatTxAmount(rec, false);
    }
    return QVariant();
}

QVariant TransactionTableModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if(orientation == Qt::Horizontal)
    {
        if(role == Qt::DisplayRole)
        {
            return columns[section];
        }
        else if (role == Qt::TextAlignmentRole)
        {
            return column_alignments[section];
        } else if (role == Qt::ToolTipRole)
        {
            switch(section)
            {
            case Status:
                return tr("Transaction status. Hover over this field to show number of confirmations.");
            case Date:
                return tr("Date and time that the transaction was received.");
            case Type:
                return tr("Type of transaction.");
            case ToAddress:
                return tr("Destination address of transaction.");
            case Amount:
                return tr("Amount removed from or added to balance.");
            }
        }
    }
    return QVariant();
}

QModelIndex TransactionTableModel::index(int row, int column, const QModelIndex &parent) const
{
    Q_UNUSED(parent);
    TransactionRecord *data = priv->index(row);
    if(data)
    {
        return createIndex(row, column, priv->index(row));
    }
    else
    {
        return QModelIndex();
    }
}