/*
SPDX-FileCopyrightText: 2001-2004,2009 Otto Bruggeman <bruggie@gmail.com>
SPDX-FileCopyrightText: 2001-2003 John Firebaugh <jfirebaugh@kde.org>

SPDX-License-Identifier: GPL-2.0-or-later
*/

#ifndef DIFFMODEL_H
#define DIFFMODEL_H

#include <QObject>

#include "diffhunk.h"
#include "kompare.h"
#include "diff2_export.h"

class QStringList;

namespace Diff2
{

/**
 * A model describing the differences between two files.
 */
class DIFF2_EXPORT DiffModel : public QObject
{
    Q_OBJECT
public:

    DiffModel(const QString& srcBaseURL, const QString& destBaseURL);
    DiffModel();
    ~DiffModel() override;

private:
    DiffModel(const DiffModel&) : QObject() {};

public:
    int parseDiff(enum Kompare::Format format, const QStringList& list);

    QString recreateDiff() const;

    int hunkCount() const       { return m_hunks.count(); }
    int differenceCount() const { return m_differences.count(); }
    int appliedCount() const    { return m_appliedCount; }

    DiffHunk* hunkAt(int i)               { return (m_hunks.at(i)); }
    const Difference* differenceAt(int i) const { return (m_differences.at(i)); }
    Difference* differenceAt(int i) { return (m_differences.at(i)); }

    DiffHunkList*         hunks()             { return &m_hunks; }
    const DiffHunkList*   hunks() const       { return &m_hunks; }
    DifferenceList*       differences()       { return &m_differences; }
    const DifferenceList* differences() const { return &m_differences; }

    int findDifference(Difference* diff) const { return m_differences.indexOf(diff); }

    Difference* firstDifference();
    Difference* lastDifference();
    Difference* prevDifference();
    Difference* nextDifference();

    const QString source() const               { return m_source; }
    const QString destination() const          { return m_destination; }
    const QString sourceFile() const;
    const QString destinationFile() const;
    const QString sourcePath() const;
    const QString destinationPath() const;
    const QString sourceTimestamp() const      { return m_sourceTimestamp; }
    const QString destinationTimestamp() const { return m_destinationTimestamp; }
    const QString sourceRevision() const       { return m_sourceRevision; }
    const QString destinationRevision() const  { return m_destinationRevision; }

    void setSourceFile(QString path);
    void setDestinationFile(QString path);
    void setSourceTimestamp(QString timestamp);
    void setDestinationTimestamp(QString timestamp);
    void setSourceRevision(QString revision);
    void setDestinationRevision(QString revision);

    void addHunk(DiffHunk* hunk);
    void addDiff(Difference* diff);
    bool hasUnsavedChanges() const;

    int  diffIndex(void) const       { return m_diffIndex; }
    void setDiffIndex(int diffIndex) { m_diffIndex = diffIndex; }

    void applyDifference(bool apply);
    void applyAllDifferences(bool apply);

    bool setSelectedDifference(Difference* diff);

    DiffModel& operator=(const DiffModel& model);
    bool operator<(const DiffModel& model);

    int localeAwareCompareSource(const DiffModel& model);

    bool isBlended() const { return m_blended; }
    void setBlended(bool blended) { m_blended = blended; }

    /**
     * @p oldlines - lines that were removed.
     * @p newLines - lines that were inserted.
     * @p startPos - number of line at which the change occurred
     */
    QPair<QList<Difference*>, QList<Difference*> > linesChanged(const QStringList& oldLines, const QStringList& newLines, int editLineNumber);

private:
    void splitSourceInPathAndFileName();
    void splitDestinationInPathAndFileName();
    void computeDiffStats(Difference* diff);
    void processStartMarker(Difference* diff, const QStringList& lines, MarkerListConstIterator& currentMarker, int& currentListLine, bool isSource);

private:
    QString m_source;
    QString m_destination;

    QString m_sourcePath;
    QString m_destinationPath;

    QString m_sourceFile;
    QString m_destinationFile;

    QString m_sourceTimestamp;
    QString m_destinationTimestamp;

    QString m_sourceRevision;
    QString m_destinationRevision;

    DiffHunkList   m_hunks;
    DifferenceList m_differences;

    int  m_appliedCount;

    int          m_diffIndex;
    Difference*  m_selectedDifference;

    bool m_blended;

private Q_SLOTS:
    void slotDifferenceApplied(Difference* diff);
};

} // End of namespace Diff2

#endif

