/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
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** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
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** use the contact form at http://qt.digia.com/contact-us.
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** 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
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****************************************************************************/

#ifndef DIFFUTILS_H
#define DIFFUTILS_H

#include "diffeditor_global.h"

#include <QString>
#include <QMap>
#include <QTextEdit>

#include "texteditor/texteditorconstants.h"

namespace TextEditor { class FontSettings; }

namespace DiffEditor {

class Diff;

class DIFFEDITOR_EXPORT DiffFileInfo {
public:
    DiffFileInfo() {}
    DiffFileInfo(const QString &file) : fileName(file) {}
    DiffFileInfo(const QString &file, const QString &type)
        : fileName(file), typeInfo(type) {}
    QString fileName;
    QString typeInfo;
};

class DIFFEDITOR_EXPORT TextLineData {
public:
    enum TextLineType {
        TextLine,
        Separator,
        Invalid
    };
    TextLineData() : textLineType(Invalid) {}
    TextLineData(const QString &txt) : textLineType(TextLine), text(txt) {}
    TextLineData(TextLineType t) : textLineType(t) {}
    TextLineType textLineType;
    QString text;
    /*
     * <start position, end position>
     * <-1, n> means this is a continuation from the previous line
     * <n, -1> means this will be continued in the next line
     * <-1, -1> the whole line is a continuation (from the previous line to the next line)
     */
    QMap<int, int> changedPositions; // counting from the beginning of the line
};

class DIFFEDITOR_EXPORT RowData {
public:
    RowData() : equal(false) {}
    RowData(const TextLineData &l)
        : leftLine(l), rightLine(l), equal(true) {}
    RowData(const TextLineData &l, const TextLineData &r)
        : leftLine(l), rightLine(r), equal(false) {}
    TextLineData leftLine;
    TextLineData rightLine;
    bool equal;
};

class DIFFEDITOR_EXPORT ChunkData {
public:
    ChunkData() : contextChunk(false),
        leftStartingLineNumber(0), rightStartingLineNumber(0) {}
    QList<RowData> rows;
    bool contextChunk;
    int leftStartingLineNumber;
    int rightStartingLineNumber;
    QString contextInfo;
};

class DIFFEDITOR_EXPORT FileData {
public:
    enum FileOperation {
        ChangeFile,
        NewFile,
        DeleteFile,
        CopyFile,
        RenameFile
    };

    FileData()
        : fileOperation(ChangeFile),
          binaryFiles(false),
          lastChunkAtTheEndOfFile(false),
          contextChunksIncluded(false) {}
    FileData(const ChunkData &chunkData)
        : fileOperation(ChangeFile),
          binaryFiles(false),
          lastChunkAtTheEndOfFile(false),
          contextChunksIncluded(false) { chunks.append(chunkData); }
    QList<ChunkData> chunks;
    DiffFileInfo leftFileInfo;
    DiffFileInfo rightFileInfo;
    FileOperation fileOperation;
    bool binaryFiles;
    bool lastChunkAtTheEndOfFile;
    bool contextChunksIncluded;
};

class DIFFEDITOR_EXPORT DiffUtils {
public:

    static ChunkData calculateOriginalData(const QList<Diff> &leftDiffList,
                                           const QList<Diff> &rightDiffList);
    static FileData calculateContextData(const ChunkData &originalData,
                                         int contextLinesNumber,
                                         int joinChunkThreshold = 1);
    static QString makePatchLine(const QChar &startLineCharacter,
                                 const QString &textLine,
                                 bool lastChunk,
                                 bool lastLine);
    static QString makePatch(const ChunkData &chunkData,
                             bool lastChunk = false);
    static QString makePatch(const ChunkData &chunkData,
                             const QString &leftFileName,
                             const QString &rightFileName,
                             bool lastChunk = false);
    static QString makePatch(const QList<FileData> &fileDataList);
    static QList<FileData> readPatch(const QString &patch,
                                     bool ignoreWhitespace,
                                     bool *ok = 0);
};

} // namespace DiffEditor

#endif // DIFFUTILS_H