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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.  For licensing terms and
** conditions see http://qt.digia.com/licensing.  For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
****************************************************************************/

#ifndef UNIFIEDDIFFEDITORWIDGET_H
#define UNIFIEDDIFFEDITORWIDGET_H

#include "diffeditor_global.h"
#include "differ.h"
#include "diffeditorcontroller.h"
#include "selectabletexteditorwidget.h"

namespace TextEditor {
class DisplaySettings;
class FontSettings;
}

QT_BEGIN_NAMESPACE
class QSplitter;
class QTextCharFormat;
QT_END_NAMESPACE

namespace DiffEditor {

class DiffEditorGuiController;
class ChunkData;
class FileData;

class DIFFEDITOR_EXPORT UnifiedDiffEditorWidget
        : public SelectableTextEditorWidget
{
    Q_OBJECT
public:
    UnifiedDiffEditorWidget(QWidget *parent = 0);
    ~UnifiedDiffEditorWidget();

    void setDiffEditorGuiController(DiffEditorGuiController *controller);
    DiffEditorGuiController *diffEditorGuiController() const;

public slots:
    void setDisplaySettings(const TextEditor::DisplaySettings &ds);

protected:
    void mouseDoubleClickEvent(QMouseEvent *e);
    void contextMenuEvent(QContextMenuEvent *e);
    TextEditor::BaseTextEditor *createEditor();
    QString lineNumber(int blockNumber) const;
    int lineNumberDigits() const;

private slots:
    void clear(const QString &message = QString());
    void clearAll(const QString &message = QString());
    void setDiff(const QList<FileData> &diffFileList,
                 const QString &workingDirectory);

    void setCurrentDiffFileIndex(int diffFileIndex);

    void setFontSettings(const TextEditor::FontSettings &fontSettings);

    void slotCursorPositionChangedInEditor();

    void slotSendChunkToCodePaster();
    void slotApplyChunk();
    void slotRevertChunk();
    void saveStateRequested();
    void restoreStateRequested();

private:
    void setLeftLineNumber(int blockNumber, int lineNumber);
    void setRightLineNumber(int blockNumber, int lineNumber);
    void setFileInfo(int blockNumber,
                     const DiffFileInfo &leftFileInfo,
                     const DiffFileInfo &rightFileInfo);
    void setChunkIndex(int startBlockNumber, int blockCount, int chunkIndex);
    void showDiff();
    QString showChunk(const ChunkData &chunkData,
                      bool lastChunk,
                      int *blockNumber,
                      int *charNumber,
                      QMap<int, QList<DiffSelection> > *selections);
    int blockNumberForFileIndex(int fileIndex) const;
    int fileIndexForBlockNumber(int blockNumber) const;
    int chunkIndexForBlockNumber(int blockNumber) const;
    void jumpToOriginalFile(const QTextCursor &cursor);
    void jumpToOriginalFile(const QString &fileName,
                            int lineNumber,
                            int columnNumber);
    void addContextMenuActions(QMenu *menu,
                               int diffFileIndex,
                               int chunkIndex);
    void patch(int diffFileIndex, int chunkIndex, bool revert);

    DiffEditorGuiController *m_guiController;
    DiffEditorController *m_controller;

    // block number, visual line number.
    QMap<int, int> m_leftLineNumbers;
    QMap<int, int> m_rightLineNumbers;
    bool m_ignoreCurrentIndexChange;
    int m_contextMenuFileIndex;
    int m_contextMenuChunkIndex;

    int m_leftLineNumberDigits;
    int m_rightLineNumberDigits;
    // block number, visual line number.
    QMap<int, QPair<DiffFileInfo, DiffFileInfo> > m_fileInfo;
    // start block number, block count of a chunk, chunk index inside a file.
    QMap<int, QPair<int, int> > m_chunkInfo;

    QList<FileData> m_contextFileData; // ultimate data to be shown
                                       // contextLinesNumber taken into account

    QTextCharFormat m_fileLineFormat;
    QTextCharFormat m_chunkLineFormat;
    QTextCharFormat m_leftLineFormat;
    QTextCharFormat m_rightLineFormat;
    QTextCharFormat m_leftCharFormat;
    QTextCharFormat m_rightCharFormat;
    QByteArray m_state;
};

} // namespace DiffEditor

#endif // UNIFIEDDIFFEDITORWIDGET_H