/*
 *  The ManaPlus Client
 *  Copyright (C) 2008-2009  The Mana World Development Team
 *  Copyright (C) 2009-2010  The Mana Developers
 *  Copyright (C) 2011-2019  The ManaPlus Developers
 *  Copyright (C) 2019-2021  Andrei Karas
 *
 *  This file is part of The ManaPlus Client.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef GUI_MODELS_TABLEMODEL_H
#define GUI_MODELS_TABLEMODEL_H

#include "utils/vector.h"

#include <set>

#include "localconsts.h"

class Widget;

class TableModelListener;

/**
 * A model for a regular table of widgets.
 */
class TableModel notfinal
{
    public:
        A_DELETE_COPY(TableModel)

        virtual ~TableModel()
        { }

        /**
         * Determines the number of rows (lines) in the table
         */
        virtual int getRows() const A_WARN_UNUSED = 0;

        /**
         * Determines the number of columns in each row
         */
        virtual int getColumns() const A_WARN_UNUSED = 0;

        /**
         * Determines the height for each row
         */
        virtual int getRowHeight() const A_WARN_UNUSED = 0;

        /**
         * Determines the width of each individual column
         */
        virtual int getColumnWidth(const int index) const A_WARN_UNUSED = 0;

        /**
         * Retrieves the widget stored at the specified location
         *  within the table.
         */
        virtual Widget *getElementAt(const int row, const int column)
                                     const A_WARN_UNUSED = 0;

        virtual void installListener(TableModelListener *const listener);

        virtual void removeListener(TableModelListener *const listener);

    protected:
        TableModel() :
            listeners()
        {
        }

        /**
         * Tells all listeners that the table is about to see an update
         */
        virtual void signalBeforeUpdate();

        /**
         * Tells all listeners that the table has seen an update
         */
        virtual void signalAfterUpdate();

    private:
        std::set<TableModelListener *> listeners;
};


class StaticTableModel final : public TableModel
{
    public:
        StaticTableModel(const int width, const int height);

        A_DELETE_COPY(StaticTableModel)

        ~StaticTableModel() override final;

        /**
         * Inserts a widget into the table model.
         * The model is resized to accomodate the widget's width and height,
         * unless column width / row height have been fixed.
         */
        void set(const int row, const int column, Widget *const widget);

        /**
         * Fixes the column width for a given column; this overrides dynamic
         * width inference.
         *
         * Semantics are undefined for width 0.
         */
        void fixColumnWidth(const int column, const int width);

        /**
         * Fixes the row height; this overrides dynamic height inference.
         *
         * Semantics are undefined for width 0.
         */
        void fixRowHeight(const int height);

        /**
         * Resizes the table model
         */
        void resize();

        int getRows() const override final A_WARN_UNUSED;
        int getColumns() const override final A_WARN_UNUSED;
        int getRowHeight() const override final A_WARN_UNUSED;
        int getWidth() const A_WARN_UNUSED;
        int getHeight() const A_WARN_UNUSED;
        int getColumnWidth(const int index) const override final A_WARN_UNUSED;
        Widget *getElementAt(const int row,
                             const int column) const override final
                             A_WARN_UNUSED;

    protected:
        int mRows;
        int mColumns;
        int mHeight;
        STD_VECTOR<Widget *> mTableModel;
        STD_VECTOR<int> mWidths;
};

#endif  // GUI_MODELS_TABLEMODEL_H
