/******************************************************************************
 *
 *  Copyright 2008 Szymon Tomasz Stefanek <pragma@kvirc.net>
 *
 *  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
 *  (at your option) 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, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 *******************************************************************************/

#ifndef __MESSAGELIST_UTILS_THEMEEDITOR_H__
#define __MESSAGELIST_UTILS_THEMEEDITOR_H__

#include <messagelist/utils/optionseteditor.h>
#include <messagelist/core/themedelegate.h>
#include <messagelist/core/theme.h>

#include <QTreeWidget>
#include <QLabel>
#include <QRect>

#include <KDialog>

class QPaintDevice;
class QCheckBox;

class KComboBox;
class KIntSpinBox;
class KLineEdit;

namespace MessageList
{

namespace Core
{

class Item;
class GroupHeaderItem;
class MessageItem;
class FakeItem;
class ModelInvariantRowMapper;

} // namespace Core

namespace Utils
{

class ThemeColumnPropertiesDialog : public KDialog
{
    Q_OBJECT
public:
    explicit ThemeColumnPropertiesDialog( QWidget * parent, Core::Theme::Column * column, const QString &title );

protected:
    Core::Theme::Column * mColumn;
    KLineEdit * mNameEdit;
    QCheckBox * mVisibleByDefaultCheck;
    QCheckBox * mIsSenderOrReceiverCheck;
    KComboBox * mMessageSortingCombo;

protected slots:
    void slotOkButtonClicked();
};

class ThemePreviewDelegate : public Core::ThemeDelegate
{
    Q_OBJECT
public:
    explicit ThemePreviewDelegate( QAbstractItemView * parent );
    ~ThemePreviewDelegate();

private:
    Core::GroupHeaderItem * mSampleGroupHeaderItem;
    Core::FakeItem * mSampleMessageItem;
    Core::ModelInvariantRowMapper * mRowMapper; // needed for the MessageItem above to be valid
public:
    virtual Core::Item * itemFromIndex( const QModelIndex &index ) const;
};

class ThemePreviewWidget : public QTreeWidget
{
    Q_OBJECT
public:
    explicit ThemePreviewWidget( QWidget * parent );
    ~ThemePreviewWidget();
    void setReadOnly( bool readOnly);

private:
    // DnD insert position stuff

    /**
   * The row we'll be inserting the dragged item into
   */
    enum RowInsertPosition
    {
        AboveRow,         ///< We'll insert above the currently hit row in mDelegate
        InsideRow,        ///< We'll insert inside the currently hit row in mDelegate
        BelowRow          ///< We'll insert below the currently hit row in mDelegate
    };

    /**
   * The position in row that we'll be inserting the dragged item
   */
    enum ItemInsertPosition
    {
        OnLeftOfItem,     ///< We'll insert on the left of the selected item
        OnRightOfItem,    ///< We'll insert on the right of the selected item
        AsLastLeftItem,   ///< We'll insert as last left item of the row (rightmost left item)
        AsLastRightItem,  ///< We'll insert as last right item of the row (leftmost right item)
        AsFirstLeftItem,  ///< We'll insert as first left item of the row (leftmost)
        AsFirstRightItem  ///< We'll insert as first right item of the row (rightmost)
    };

private:
    ThemePreviewDelegate * mDelegate;
    QTreeWidgetItem * mGroupHeaderSampleItem;
    QRect mThemeSelectedContentItemRect;
    Core::Theme::ContentItem * mSelectedThemeContentItem;
    Core::Theme::Column * mSelectedThemeColumn;
    QPoint mMouseDownPoint;
    Core::Theme * mTheme;
    RowInsertPosition mRowInsertPosition;
    ItemInsertPosition mItemInsertPosition;
    QPoint mDropIndicatorPoint1;
    QPoint mDropIndicatorPoint2;
    bool mFirstShow;
    bool mReadOnly;
public:
    QSize sizeHint() const;
    void setTheme( Core::Theme * theme );

protected:
    virtual void dragMoveEvent( QDragMoveEvent * e );
    virtual void dragEnterEvent( QDragEnterEvent * e );
    virtual void dropEvent( QDropEvent * e );
    virtual void mouseMoveEvent( QMouseEvent * e );
    virtual void mousePressEvent( QMouseEvent * e );
    virtual void paintEvent( QPaintEvent * e );
    virtual void showEvent( QShowEvent * e );

private:
    void internalHandleDragMoveEvent( QDragMoveEvent * e );
    void internalHandleDragEnterEvent( QDragEnterEvent * e );

    /**
   * Computes the drop insert position for the dragged item at position pos.
   * Returns true if the dragged item can be inserted somewhere and
   * false otherwise. Sets mRowInsertPosition, mItemInsertPosition,
   * mDropIndicatorPoint1 ,mDropIndicatorPoint2.
   */
    bool computeContentItemInsertPosition( const QPoint &pos, Core::Theme::ContentItem::Type type );

    void applyThemeColumnWidths();

protected slots:
    void slotHeaderContextMenuRequested( const QPoint &pos );
    void slotAddColumn();
    void slotColumnProperties();
    void slotDeleteColumn();
    void slotDisabledFlagsMenuTriggered( QAction * act );
    void slotForegroundColorMenuTriggered( QAction * act );
    void slotFontMenuTriggered( QAction * act );
    void slotSoftenActionTriggered( bool );
    void slotGroupHeaderBackgroundModeMenuTriggered( QAction * act );
    void slotGroupHeaderBackgroundStyleMenuTriggered( QAction * act );
    void slotMoveColumnToLeft();
    void slotMoveColumnToRight();

};

class ThemeContentItemSourceLabel : public QLabel
{
    Q_OBJECT
public:
    ThemeContentItemSourceLabel( QWidget * parent, Core::Theme::ContentItem::Type type );
    ~ThemeContentItemSourceLabel();

public:
    Core::Theme::ContentItem::Type type() const;
    void startDrag();

protected:
    void mousePressEvent( QMouseEvent * e );
    void mouseMoveEvent( QMouseEvent * e );

private:
    Core::Theme::ContentItem::Type mType;
    QPoint mMousePressPoint;
};


class ThemeEditor : public OptionSetEditor
{
    Q_OBJECT
public:
    explicit ThemeEditor( QWidget *parent );
    ~ThemeEditor();

public:
    /**
   * Sets the option set to be edited.
   * Saves and forgets any previously option set that was being edited.
   * The set parameter may be 0: in this case the editor is simply disabled.
   */
    void editTheme( Core::Theme *set );

    Core::Theme * editedTheme() const;

    void commit();
signals:
    void themeNameChanged();

private:
    void fillViewHeaderPolicyCombo();

protected slots:
    void slotNameEditTextEdited( const QString &newName );
    void slotIconSizeSpinBoxValueChanged( int val );

private:
    void setReadOnly( bool readOnly );

    Core::Theme * mCurrentTheme; // shallow, may be null!

    // Appearance tab
    ThemePreviewWidget * mPreviewWidget;

    // Advanced tab
    KComboBox * mViewHeaderPolicyCombo;
    KIntSpinBox * mIconSizeSpinBox;
};

} // namespace Utils

} // namespace MessageList

#endif //!__MESSAGELIST_UTILS_SKINEDITOR_H__