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#include <QtGui>

#include "piecesmodel.h"

PiecesModel::PiecesModel(QObject *parent)

    : QAbstractListModel(parent)

{

}

QVariant PiecesModel::data(const QModelIndex &index, int role) const

{

    if (!index.isValid())

        return QVariant();

    if (role == Qt::DecorationRole)

        return QIcon(pixmaps.value(index.row()).scaled(60, 60,

                         Qt::KeepAspectRatio, Qt::SmoothTransformation));

    else if (role == Qt::UserRole)

        return pixmaps.value(index.row());

    else if (role == Qt::UserRole + 1)

        return locations.value(index.row());

    return QVariant();

}

void PiecesModel::addPiece(const QPixmap &pixmap, const QPoint &location)

{

    int row;

    if (int(2.0*qrand()/(RAND_MAX+1.0)) == 1)

        row = 0;

    else

        row = pixmaps.size();

    beginInsertRows(QModelIndex(), row, row);

    pixmaps.insert(row, pixmap);

    locations.insert(row, location);

    endInsertRows();

}

Qt::ItemFlags PiecesModel::flags(const QModelIndex &index) const

{

    if (index.isValid())

        return (Qt::ItemIsEnabled | Qt::ItemIsSelectable | Qt::ItemIsDragEnabled);

    return Qt::ItemIsDropEnabled;

}

bool PiecesModel::removeRows(int row, int count, const QModelIndex &parent)

{

    if (parent.isValid())

        return false;

    if (row >= pixmaps.size() || row + count <= 0)

        return false;

    int beginRow = qMax(0, row);

    int endRow = qMin(row + count - 1, pixmaps.size() - 1);

    beginRemoveRows(parent, beginRow, endRow);

    while (beginRow <= endRow) {

        pixmaps.removeAt(beginRow);

        locations.removeAt(beginRow);

        ++beginRow;

    }

    endRemoveRows();

    return true;

}

QStringList PiecesModel::mimeTypes() const

{

    QStringList types;

    types << "image/x-puzzle-piece";

    return types;

}

QMimeData *PiecesModel::mimeData(const QModelIndexList &indexes) const

{

    QMimeData *mimeData = new QMimeData();

    QByteArray encodedData;

    QDataStream stream(&encodedData, QIODevice::WriteOnly);

    foreach (QModelIndex index, indexes) {

        if (index.isValid()) {

            QPixmap pixmap = qVariantValue<QPixmap>(data(index, Qt::UserRole));

            QPoint location = data(index, Qt::UserRole+1).toPoint();

            stream << pixmap << location;

        }

    }

    mimeData->setData("image/x-puzzle-piece", encodedData);

    return mimeData;

}

bool PiecesModel::dropMimeData(const QMimeData *data, Qt::DropAction action,

                               int row, int column, const QModelIndex &parent)

{

    if (!data->hasFormat("image/x-puzzle-piece"))

        return false;

    if (action == Qt::IgnoreAction)

        return true;

    if (column > 0)

        return false;

    int endRow;

    if (!parent.isValid()) {

        if (row < 0)

            endRow = pixmaps.size();

        else

            endRow = qMin(row, pixmaps.size());

    } else

        endRow = parent.row();

    QByteArray encodedData = data->data("image/x-puzzle-piece");

    QDataStream stream(&encodedData, QIODevice::ReadOnly);

    while (!stream.atEnd()) {

        QPixmap pixmap;

        QPoint location;

        stream >> pixmap >> location;

        beginInsertRows(QModelIndex(), endRow, endRow);

        pixmaps.insert(endRow, pixmap);

        locations.insert(endRow, location);

        endInsertRows();

        ++endRow;

    }

    return true;

}

int PiecesModel::rowCount(const QModelIndex &parent) const

{

    if (parent.isValid())

        return 0;

    else

        return pixmaps.size();

}

Qt::DropActions PiecesModel::supportedDropActions() const

{

    return Qt::CopyAction | Qt::MoveAction;

}

void PiecesModel::addPieces(const QPixmap& pixmap)

{

    beginRemoveRows(QModelIndex(), 0, 24);

    pixmaps.clear();

    locations.clear();

    endRemoveRows();

    for (int y = 0; y < 5; ++y) {

        for (int x = 0; x < 5; ++x) {

            QPixmap pieceImage = pixmap.copy(x*80, y*80, 80, 80);

            addPiece(pieceImage, QPoint(x, y));

        }

    }

}