#include "LayersEditor.hpp"
#include "MainWindow.hpp"
#include <QVBoxLayout>
#include <QScrollBar>
#include <QMimeData>

class LayerDataChangeUndoCommand : public EditorUndoCommand
{
    QModelIndex m_index;
    int m_undoVal, m_redoVal;
    bool m_undid = false;
public:
    explicit LayerDataChangeUndoCommand(ProjectModel::LayersNode* node, const QString& text,
                                        QModelIndex index, int redoVal)
    : EditorUndoCommand(node, text), m_index(index), m_redoVal(redoVal) {}
    void undo()
    {
        m_undid = true;
        amuse::LayerMapping& layer = (*static_cast<ProjectModel::LayersNode*>(m_node.get())->m_obj)[m_index.row()];

        switch (m_index.column())
        {
        case 0:
            layer.macro.id = m_undoVal;
            break;
        case 1:
            layer.keyLo = m_undoVal;
            break;
        case 2:
            layer.keyHi = m_undoVal;
            break;
        case 3:
            layer.transpose = m_undoVal;
            break;
        case 4:
            layer.volume = m_undoVal;
            break;
        case 5:
            layer.prioOffset = m_undoVal;
            break;
        case 6:
            layer.span = m_undoVal;
            break;
        case 7:
            layer.pan = m_undoVal;
            break;
        default:
            break;
        }

        EditorUndoCommand::undo();
    }
    void redo()
    {
        amuse::LayerMapping& layer = (*static_cast<ProjectModel::LayersNode*>(m_node.get())->m_obj)[m_index.row()];

        switch (m_index.column())
        {
        case 0:
            m_undoVal = layer.macro.id;
            layer.macro.id = m_redoVal;
            break;
        case 1:
            m_undoVal = layer.keyLo;
            layer.keyLo = m_redoVal;
            break;
        case 2:
            m_undoVal = layer.keyHi;
            layer.keyHi = m_redoVal;
            break;
        case 3:
            m_undoVal = layer.transpose;
            layer.transpose = m_redoVal;
            break;
        case 4:
            m_undoVal = layer.volume;
            layer.volume = m_redoVal;
            break;
        case 5:
            m_undoVal = layer.prioOffset;
            layer.prioOffset = m_redoVal;
            break;
        case 6:
            m_undoVal = layer.span;
            layer.span = m_redoVal;
            break;
        case 7:
            m_undoVal = layer.pan;
            layer.pan = m_redoVal;
            break;
        default:
            break;
        }

        if (m_undid)
            EditorUndoCommand::redo();
    }
};

SoundMacroDelegate::SoundMacroDelegate(QObject* parent)
: QStyledItemDelegate(parent) {}

QWidget* SoundMacroDelegate::createEditor(QWidget* parent, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    const LayersModel* model = static_cast<const LayersModel*>(index.model());
    ProjectModel::GroupNode* group = g_MainWindow->projectModel()->getGroupNode(model->m_node.get());
    EditorFieldProjectNode* cb =
        new EditorFieldProjectNode(group->getCollectionOfType(ProjectModel::INode::Type::SoundMacro), parent);
    connect(cb, SIGNAL(currentIndexChanged(int)), this, SLOT(smIndexChanged()));
    return cb;
}

void SoundMacroDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const
{
    const LayersModel* model = static_cast<const LayersModel*>(index.model());
    const amuse::LayerMapping& layer = (*model->m_node->m_obj)[index.row()];
    ProjectModel::GroupNode* group = g_MainWindow->projectModel()->getGroupNode(model->m_node.get());
    ProjectModel::CollectionNode* smColl = group->getCollectionOfType(ProjectModel::INode::Type::SoundMacro);
    static_cast<EditorFieldProjectNode*>(editor)->setCurrentIndex(smColl->indexOfId(layer.macro.id) + 1);
    if (static_cast<EditorFieldProjectNode*>(editor)->shouldPopupOpen())
        static_cast<EditorFieldProjectNode*>(editor)->showPopup();
}

void SoundMacroDelegate::setModelData(QWidget* editor, QAbstractItemModel* m, const QModelIndex& index) const
{
    const LayersModel* model = static_cast<const LayersModel*>(m);
    amuse::LayerMapping& layer = (*model->m_node->m_obj)[index.row()];
    ProjectModel::GroupNode* group = g_MainWindow->projectModel()->getGroupNode(model->m_node.get());
    ProjectModel::CollectionNode* smColl = group->getCollectionOfType(ProjectModel::INode::Type::SoundMacro);
    int idx = static_cast<EditorFieldProjectNode*>(editor)->currentIndex();
    amuse::SoundMacroId id;
    if (idx != 0)
        id = smColl->idOfIndex(idx - 1);
    if (layer.macro.id == id)
        return;
    g_MainWindow->pushUndoCommand(new LayerDataChangeUndoCommand(model->m_node.get(),
        tr("Change %1").arg(m->headerData(0, Qt::Horizontal).toString()), index, id.id));
    emit m->dataChanged(index, index, {Qt::DisplayRole, Qt::EditRole});
}

void SoundMacroDelegate::smIndexChanged()
{
    emit commitData(static_cast<QWidget*>(sender()));
}

void LayersModel::loadData(ProjectModel::LayersNode* node)
{
    beginResetModel();
    m_node = node;
    endResetModel();
}

void LayersModel::unloadData()
{
    beginResetModel();
    m_node.reset();
    endResetModel();
}

int LayersModel::rowCount(const QModelIndex& parent) const
{
    if (parent.isValid())
        return 0;
    if (!m_node)
        return 0;
    return int(m_node->m_obj->size()) + 1;
}

int LayersModel::columnCount(const QModelIndex& parent) const
{
    if (parent.isValid())
        return 0;
    return 8;
}

QVariant LayersModel::data(const QModelIndex& index, int role) const
{
    if (!m_node)
        return QVariant();
    if (index.row() == m_node->m_obj->size())
        return QVariant();
    const amuse::LayerMapping& layer = (*m_node->m_obj)[index.row()];

    if (role == Qt::DisplayRole || role == Qt::EditRole)
    {
        switch (index.column())
        {
        case 0:
        {
            ProjectModel::GroupNode* group = g_MainWindow->projectModel()->getGroupNode(m_node.get());
            ProjectModel::CollectionNode* smColl = group->getCollectionOfType(ProjectModel::INode::Type::SoundMacro);
            if (ProjectModel::BasePoolObjectNode* node = smColl->nodeOfId(layer.macro.id))
                return node->text();
            return QVariant();
        }
        case 1:
            return layer.keyLo;
        case 2:
            return layer.keyHi;
        case 3:
            return layer.transpose;
        case 4:
            return layer.volume;
        case 5:
            return layer.prioOffset;
        case 6:
            return layer.span;
        case 7:
            return layer.pan;
        default:
            break;
        }
    }

    return QVariant();
}

bool LayersModel::setData(const QModelIndex& index, const QVariant& value, int role)
{
    if (!m_node || role != Qt::EditRole)
        return false;
    const amuse::LayerMapping& layer = (*m_node->m_obj)[index.row()];

    switch (index.column())
    {
    case 0:
        if (layer.macro.id == value.toInt())
            return false;
        break;
    case 1:
        if (layer.keyLo == value.toInt())
            return false;
        break;
    case 2:
        if (layer.keyHi == value.toInt())
            return false;
        break;
    case 3:
        if (layer.transpose == value.toInt())
            return false;
        break;
    case 4:
        if (layer.volume == value.toInt())
            return false;
        break;
    case 5:
        if (layer.prioOffset == value.toInt())
            return false;
        break;
    case 6:
        if (layer.span == value.toInt())
            return false;
        break;
    case 7:
        if (layer.pan == value.toInt())
            return false;
        break;
    default:
        return false;
    }

    g_MainWindow->pushUndoCommand(new LayerDataChangeUndoCommand(m_node.get(),
        tr("Change %1").arg(headerData(index.column(), Qt::Horizontal).toString()), index, value.toInt()));
    emit dataChanged(index, index, {Qt::DisplayRole, Qt::EditRole});

    return false;
}

QVariant LayersModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (orientation == Qt::Horizontal && role == Qt::DisplayRole)
    {
        switch (section)
        {
        case 0:
            return tr("SoundMacro");
        case 1:
            return tr("Key Lo");
        case 2:
            return tr("Key Hi");
        case 3:
            return tr("Transpose");
        case 4:
            return tr("Volume");
        case 5:
            return tr("Prio Off");
        case 6:
            return tr("Span");
        case 7:
            return tr("Pan");
        default:
            break;
        }
    }
    return QVariant();
}

Qt::ItemFlags LayersModel::flags(const QModelIndex& index) const
{
    if (!index.isValid())
        return Qt::NoItemFlags;
    if (index.row() == m_node->m_obj->size())
        return Qt::NoItemFlags;
    return Qt::ItemIsSelectable | Qt::ItemIsEnabled | Qt::ItemIsEditable | Qt::ItemIsDragEnabled | Qt::ItemIsDropEnabled;
}

Qt::DropActions LayersModel::supportedDropActions() const
{
    return Qt::MoveAction;
}

Qt::DropActions LayersModel::supportedDragActions() const
{
    return Qt::MoveAction;
}

class LayerRowMoveCommand : public EditorUndoCommand
{
    LayersTableView* m_view;
    int m_undoPos, m_redoPos, m_count;
    bool m_undid = false;
public:
    explicit LayerRowMoveCommand(ProjectModel::LayersNode* node, const QString& text, LayersTableView* view,
                                 int undoPos, int redoPos, int count)
    : EditorUndoCommand(node, text), m_view(view), m_undoPos(undoPos), m_redoPos(redoPos), m_count(count) {}
    void undo()
    {
        m_undid = true;
        EditorUndoCommand::undo();
        if (m_redoPos > m_undoPos)
            m_view->model()->moveRows(QModelIndex(), m_redoPos - 1, m_count, QModelIndex(), m_undoPos);
        else
            m_view->model()->moveRows(QModelIndex(), m_redoPos, m_count, QModelIndex(), m_undoPos + 1);
    }
    void redo()
    {
        if (m_undid)
            EditorUndoCommand::redo();
        m_view->model()->moveRows(QModelIndex(), m_undoPos, m_count, QModelIndex(), m_redoPos);
    }
};

bool LayersModel::dropMimeData(const QMimeData* data, Qt::DropAction action,
                               int row, int column, const QModelIndex& parent)
{
    // check if the action is supported
    if (!data || action != Qt::MoveAction)
        return false;
    // check if the format is supported
    QStringList types = mimeTypes();
    if (types.isEmpty())
        return false;
    QString format = types.at(0);
    if (!data->hasFormat(format))
        return false;

    // decode and insert
    QByteArray encoded = data->data(format);
    QDataStream stream(&encoded, QIODevice::ReadOnly);

    std::unordered_set<int> rows;
    int lastRow = -1;

    while (!stream.atEnd()) {
        int r, c;
        QMap<int, QVariant> v;
        stream >> r >> c >> v;
        rows.insert(r);
        lastRow = r;
    }

    if (lastRow == -1)
        return false;

    int start = lastRow;
    while (rows.find(start - 1) != rows.cend())
        start -= 1;
    int count = lastRow - start + 1;
    while (rows.find(start + count) != rows.cend())
        count += 1;

    int dest = parent.row();
    if (dest >= start)
    {
        if (dest - start < count)
            return false;
        dest += 1;
    }

    g_MainWindow->pushUndoCommand(new LayerRowMoveCommand(m_node.get(),
        count > 1 ? tr("Move Layers") : tr("Move Layer"),
        &static_cast<LayersEditor*>(QObject::parent())->m_tableView, start, dest, count));

    return true;
}

class LayerRowUndoCommand : public EditorUndoCommand
{
protected:
    LayersTableView* m_view;
    std::vector<std::pair<amuse::LayerMapping, int>> m_data;
    bool m_undid = false;
    void add()
    {
        m_view->selectionModel()->clearSelection();
        for (const auto& p : m_data)
        {
            static_cast<LayersModel*>(m_view->model())->_insertRow(p.second, p.first);
            m_view->selectionModel()->select(QItemSelection(
                m_view->model()->index(p.second, 0), m_view->model()->index(p.second, 7)),
                    QItemSelectionModel::SelectCurrent);
        }
    }
    void del()
    {
        for (auto it = m_data.rbegin(); it != m_data.rend(); ++it)
        {
            it->first = static_cast<LayersModel*>(m_view->model())->_removeRow(it->second);
        }
    }
    void undo()
    {
        m_undid = true;
        EditorUndoCommand::undo();
    }
    void redo()
    {
        if (m_undid)
            EditorUndoCommand::redo();
    }
public:
    explicit LayerRowUndoCommand(ProjectModel::LayersNode* node, const QString& text, LayersTableView* view,
                                 std::vector<std::pair<amuse::LayerMapping, int>>&& data)
    : EditorUndoCommand(node, text), m_view(view), m_data(std::move(data)) {}
};

class LayerRowAddUndoCommand : public LayerRowUndoCommand
{
    using base = LayerRowUndoCommand;
public:
    explicit LayerRowAddUndoCommand(ProjectModel::LayersNode* node, const QString& text, LayersTableView* view,
                                    std::vector<std::pair<amuse::LayerMapping, int>>&& data)
    : LayerRowUndoCommand(node, text, view, std::move(data)) {}
    void undo() { base::undo(); base::del(); }
    void redo() { base::redo(); base::add(); }
};

class LayerRowDelUndoCommand : public LayerRowUndoCommand
{
    using base = LayerRowUndoCommand;
public:
    explicit LayerRowDelUndoCommand(ProjectModel::LayersNode* node, const QString& text, LayersTableView* view,
                                    std::vector<std::pair<amuse::LayerMapping, int>>&& data)
    : LayerRowUndoCommand(node, text, view, std::move(data)) {}
    void undo() { base::undo(); base::add(); }
    void redo() { base::redo(); base::del(); }
};

bool LayersModel::insertRows(int row, int count, const QModelIndex& parent)
{
    if (!m_node)
        return false;
    beginInsertRows(parent, row, row + count - 1);
    std::vector<amuse::LayerMapping>& layers = *m_node->m_obj;
    layers.insert(layers.begin() + row, count, amuse::LayerMapping());
    endInsertRows();
    return true;
}

bool LayersModel::moveRows(const QModelIndex& sourceParent, int sourceRow, int count,
                           const QModelIndex& destinationParent, int destinationChild)
{
    if (!m_node)
        return false;
    beginMoveRows(sourceParent, sourceRow, sourceRow + count - 1, destinationParent, destinationChild);
    std::vector<amuse::LayerMapping>& layers = *m_node->m_obj;
    if (destinationChild < sourceRow)
    {
        for (int i = 0; i < count; ++i)
        {
            amuse::LayerMapping tmp = std::move(layers[sourceRow]);
            for (int j = sourceRow; j != destinationChild; --j)
                layers[j] = std::move(layers[j - 1]);
            layers[destinationChild] = std::move(tmp);
            ++sourceRow;
            ++destinationChild;
        }
    }
    else if (destinationChild > sourceRow)
    {
        for (int i = 0; i < count; ++i)
        {
            amuse::LayerMapping tmp = std::move(layers[sourceRow]);
            for (int j = sourceRow; j != destinationChild - 1; ++j)
                layers[j] = std::move(layers[j + 1]);
            layers[destinationChild - 1] = std::move(tmp);
        }
    }
    endMoveRows();
    return true;
}

bool LayersModel::removeRows(int row, int count, const QModelIndex& parent)
{
    if (!m_node)
        return false;
    beginRemoveRows(parent, row, row + count - 1);
    std::vector<amuse::LayerMapping>& layers = *m_node->m_obj;
    layers.erase(layers.begin() + row, layers.begin() + row + count);
    endRemoveRows();
    return true;
}

void LayersModel::_insertRow(int row, const amuse::LayerMapping& data)
{
    if (!m_node)
        return;
    beginInsertRows(QModelIndex(), row, row);
    std::vector<amuse::LayerMapping>& layers = *m_node->m_obj;
    layers.insert(layers.begin() + row, data);
    endInsertRows();
}

amuse::LayerMapping LayersModel::_removeRow(int row)
{
    if (!m_node)
        return {};
    beginRemoveRows(QModelIndex(), row, row);
    std::vector<amuse::LayerMapping>& layers = *m_node->m_obj;
    amuse::LayerMapping ret = layers[row];
    layers.erase(layers.begin() + row);
    endRemoveRows();
    return ret;
}

LayersModel::LayersModel(QObject* parent)
: QAbstractTableModel(parent)
{}

void LayersTableView::deleteSelection()
{
    QModelIndexList list = selectionModel()->selectedRows();
    if (list.isEmpty())
        return;
    std::vector<std::pair<amuse::LayerMapping, int>> data;
    data.reserve(list.size());
    for (QModelIndex idx : list)
        data.push_back(std::make_pair(amuse::LayerMapping{}, idx.row()));
    std::sort(data.begin(), data.end(), [](const auto& a, const auto& b) { return a.second < b.second; });
    g_MainWindow->pushUndoCommand(
        new LayerRowDelUndoCommand(static_cast<LayersModel*>(model())->m_node.get(),
            data.size() > 1 ? tr("Delete Layers") : tr("Delete Layer"), this, std::move(data)));
}

void LayersTableView::setModel(QAbstractItemModel* model)
{
    QTableView::setModel(model);
    horizontalHeader()->setMinimumSectionSize(75);
    horizontalHeader()->setSectionResizeMode(0, QHeaderView::Stretch);
    horizontalHeader()->setSectionResizeMode(1, QHeaderView::Fixed);
    horizontalHeader()->resizeSection(1, 75);
    horizontalHeader()->setSectionResizeMode(2, QHeaderView::Fixed);
    horizontalHeader()->resizeSection(2, 75);
    horizontalHeader()->setSectionResizeMode(3, QHeaderView::Fixed);
    horizontalHeader()->resizeSection(3, 75);
    horizontalHeader()->setSectionResizeMode(4, QHeaderView::Fixed);
    horizontalHeader()->resizeSection(4, 75);
    horizontalHeader()->setSectionResizeMode(5, QHeaderView::Fixed);
    horizontalHeader()->resizeSection(5, 75);
    horizontalHeader()->setSectionResizeMode(6, QHeaderView::Fixed);
    horizontalHeader()->resizeSection(6, 75);
    horizontalHeader()->setSectionResizeMode(7, QHeaderView::Fixed);
    horizontalHeader()->resizeSection(7, 75);
}

LayersTableView::LayersTableView(QWidget* parent)
: QTableView(parent)
{
    setSelectionBehavior(QAbstractItemView::SelectRows);
    setSelectionMode(QAbstractItemView::ExtendedSelection);
    setDragDropMode(QAbstractItemView::InternalMove);
    setDefaultDropAction(Qt::MoveAction);
    setDragEnabled(true);
    setGridStyle(Qt::NoPen);

    m_signedDelegate.setItemEditorFactory(&m_signedFactory);
    m_unsignedDelegate.setItemEditorFactory(&m_unsignedFactory);

    setItemDelegateForColumn(0, &m_smDelegate);
    setItemDelegateForColumn(1, &m_unsignedDelegate);
    setItemDelegateForColumn(2, &m_unsignedDelegate);
    setItemDelegateForColumn(3, &m_signedDelegate);
    setItemDelegateForColumn(4, &m_unsignedDelegate);
    setItemDelegateForColumn(5, &m_signedDelegate);
    setItemDelegateForColumn(6, &m_unsignedDelegate);
    setItemDelegateForColumn(7, &m_unsignedDelegate);
}

bool LayersEditor::loadData(ProjectModel::LayersNode* node)
{
    m_model.loadData(node);
    return true;
}

void LayersEditor::unloadData()
{
    m_model.unloadData();
}

ProjectModel::INode* LayersEditor::currentNode() const
{
    return m_model.m_node.get();
}

void LayersEditor::resizeEvent(QResizeEvent* ev)
{
    m_tableView.setGeometry(QRect({}, ev->size()));
    m_addRemoveButtons.move(0, ev->size().height() - 32);
}

void LayersEditor::doAdd()
{
    QModelIndex idx = m_tableView.selectionModel()->currentIndex();
    std::vector<std::pair<amuse::LayerMapping, int>> data;
    if (!idx.isValid())
        data.push_back(std::make_pair(amuse::LayerMapping{}, m_model.rowCount() - 1));
    else
        data.push_back(std::make_pair(amuse::LayerMapping{}, idx.row()));
    g_MainWindow->pushUndoCommand(new LayerRowAddUndoCommand(m_model.m_node.get(),
        tr("Add Layer"), &m_tableView, std::move(data)));
}

void LayersEditor::doSelectionChanged()
{
    m_addRemoveButtons.removeAction()->setDisabled(m_tableView.selectionModel()->selectedRows().isEmpty());
    g_MainWindow->updateFocus();
}

bool LayersEditor::isItemEditEnabled() const
{
    return !m_tableView.selectionModel()->selectedRows().isEmpty();
}

void LayersEditor::itemCutAction()
{

}

void LayersEditor::itemCopyAction()
{

}

void LayersEditor::itemPasteAction()
{

}

void LayersEditor::itemDeleteAction()
{
    m_tableView.deleteSelection();
}

LayersEditor::LayersEditor(QWidget* parent)
: EditorWidget(parent), m_model(this), m_tableView(this), m_addRemoveButtons(this)
{
    m_tableView.setModel(&m_model);
    connect(m_tableView.selectionModel(), SIGNAL(selectionChanged(const QItemSelection&, const QItemSelection&)),
            this, SLOT(doSelectionChanged()));

    m_addRemoveButtons.addAction()->setToolTip(tr("Add new layer mapping"));
    connect(m_addRemoveButtons.addAction(), SIGNAL(triggered(bool)), this, SLOT(doAdd()));
    m_addRemoveButtons.removeAction()->setToolTip(tr("Remove selected layer mappings"));
    connect(m_addRemoveButtons.removeAction(), SIGNAL(triggered(bool)), this, SLOT(itemDeleteAction()));
}