/* Copyright (C) 2018
 * swift project Community / Contributors
 *
 * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
 * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
 * or distributed except according to the terms contained in the LICENSE file.
 */

//! \file

#ifndef BLACKGUI_MODELS_LISTMODELBASENONTEMPLATE_H
#define BLACKGUI_MODELS_LISTMODELBASENONTEMPLATE_H

#include "blackgui/models/columns.h"
#include "blackgui/dropbase.h"
#include "blackgui/blackguiexport.h"
#include "blackmisc/digestsignal.h"
#include "blackmisc/variant.h"

#include <QJsonDocument>
#include <QJsonObject>
#include <QModelIndex>
#include <QModelIndexList>
#include <QStandardItemModel>
#include <QString>
#include <QStringList>
#include <QVariant>
#include <QVector>

class QMimeData;
class QModelIndex;

namespace BlackMisc { class CWorker; }
namespace BlackGui
{
    namespace Models
    {
        //! Non templated base class, allows Q_OBJECT and signals to be used
        class BLACKGUI_EXPORT CListModelBaseNonTemplate :
            public QStandardItemModel,
            public CDropBase
        {
            Q_OBJECT

        public:
            //! Number of elements when to use asynchronous updates
            static constexpr int asyncThreshold = 50;

            //! Destructor
            virtual ~CListModelBaseNonTemplate() override {}

            //! \name Functions from QStandardItemModel
            //! @{
            virtual int columnCount(const QModelIndex &modelIndex = QModelIndex()) const final override;
            virtual QVariant headerData(int section, Qt::Orientation orientation, int role) const final override;
            virtual QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const final override;
            virtual QModelIndex parent(const QModelIndex &child) const final override;
            virtual Qt::ItemFlags flags(const QModelIndex &index) const final override;
            virtual Qt::DropActions supportedDragActions() const final override;
            virtual Qt::DropActions supportedDropActions() const final override;
            virtual QStringList mimeTypes() const final override;
            //! @}

            //! Column to property index
            virtual BlackMisc::CPropertyIndex columnToPropertyIndex(int column) const;

            //! Property index to column number
            virtual int propertyIndexToColumn(const BlackMisc::CPropertyIndex &propertyIndex) const;

            //! Index to property index
            virtual BlackMisc::CPropertyIndex modelIndexToPropertyIndex(const QModelIndex &index) const;

            //! Set sort column
            virtual void setSortColumn(int column) { m_sortColumn = column; }

            //! Disable sorting
            void setNoSorting() { this->setSortColumn(-1); }

            //! Sort by index
            void sortByPropertyIndex(const BlackMisc::CPropertyIndex &propertyIndex, Qt::SortOrder order = Qt::AscendingOrder);

            //! Set column for sorting
            //! \param propertyIndex index of column to be sorted
            virtual bool setSortColumnByPropertyIndex(const BlackMisc::CPropertyIndex &propertyIndex);

            //! Sorting
            virtual bool setSorting(const BlackMisc::CPropertyIndex &propertyIndex, Qt::SortOrder order = Qt::AscendingOrder);

            //! Get sort column property index
            virtual int getSortColumn() const { return m_sortColumn; }

            //! Sorted by property
            BlackMisc::CPropertyIndex getSortProperty() const;

            //! Has valid sort column?
            virtual bool hasValidSortColumn() const;

            //! Get sort order
            virtual Qt::SortOrder getSortOrder() const { return m_sortOrder; }

            //! Orderable, normally use a container BlackMisc::IOrderableList
            virtual bool isOrderable() const = 0;

            //! Mark as about to be destroyed, normally marked from view
            void markDestroyed();

            //! Model about to be destroyed?
            bool isModelDestroyed();

            //! Remove all highlighting
            virtual void clearHighlighting();

            //! Has highlighted rows?
            virtual bool hasHighlightedRows() const;

            //! Drop actions
            void setDropActions(Qt::DropActions dropActions) { m_dropActions = dropActions; }

            //! Send signal that data have been changed.
            //! \note Meant for scenarios where the container is directly updated and a subsequent signal is required
            void emitDataChanged(int startRowIndex, int endRowIndex);

            //! Convert to JSON
            virtual QJsonObject toJson(bool selectedOnly = false) const = 0;

            //! Convert to JSON string
            virtual QString toJsonString(QJsonDocument::JsonFormat format = QJsonDocument::Indented, bool selectedOnly = false) const = 0;

            //! The columns
            const CColumns &getColumns() const { return m_columns; }

            //! Using void column at the end?
            bool endsWithEmptyColumn() const { return m_columns.endsWithEmptyColumn(); }

        signals:
            //! Asynchronous update finished
            void asyncUpdateFinished();

            //! Data changed
            //! \remark passing back selected objects so they can be reselected
            //! \remark condsider modelDataChangedDigest for performance reasons
            void modelDataChanged(int count, bool withFilter);

            //! Data changed, digest version
            void modelDataChangedDigest(int count, bool withFilter);

            //! Model has been changed
            //! Triggered with each change, for performance consider using changedDigest
            void changed();

            //! Model has been changed, digest signal
            void changedDigest();

            //! Template free information, that object changed
            void objectChanged(const BlackMisc::CVariant &object, const BlackMisc::CPropertyIndex &changedIndex);

        protected:
            //! Feedback when QStandardItemModel::dataChanged was called
            virtual void onDataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight, const QVector<int> &roles) = 0;

            //! Digest signal
            virtual void onChangedDigest() = 0;

            //! Constructor
            //! \param translationContext I18N context
            //! \param parent
            CListModelBaseNonTemplate(const QString &translationContext, QObject *parent = nullptr);

            CColumns        m_columns;                         //!< columns metadata
            int             m_sortColumn;                      //!< currently sorted column
            bool            m_modelDestroyed = false;          //!< \todo rudimentary workaround for T579, can be removed
            Qt::SortOrder   m_sortOrder;                       //!< sort order (asc/desc)
            Qt::DropActions m_dropActions = Qt::IgnoreAction;  //!< drop actions
            BlackMisc::CPropertyIndexList m_sortTieBreakers;   //!< how column values are sorted if equal, if no value is given this is random

        private:
            BlackMisc::CDigestSignal m_dsModelsChanged { this, &CListModelBaseNonTemplate::changed, &CListModelBaseNonTemplate::onChangedDigest, 500, 10 };
        };

    } // namespace
} // namespace
#endif // guard