/****************************************************************************
**
** Copyright (C) 2013 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
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** use the contact form at http://qt.digia.com/contact-us.
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** 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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** rights.  These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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****************************************************************************/

#ifndef DIFFEDITORPLUGIN_H
#define DIFFEDITORPLUGIN_H

#include <extensionsystem/iplugin.h>
#include <coreplugin/editormanager/ieditorfactory.h>
#include <coreplugin/editormanager/ieditor.h>
#include <coreplugin/icontext.h>
#include <coreplugin/idocument.h>

#include <QtPlugin>
#include <QPointer>
#include <QStringList>
#include <QAction>
#include <QToolBar>

namespace DIFFEditor {
class DiffEditorWidget;

namespace Internal {
class DiffFile;

class DiffEditor : public Core::IEditor
{
    Q_OBJECT
public:
    explicit DiffEditor(DiffEditorWidget *editorWidget);
    virtual ~DiffEditor();

public:
    // Core::IEditor
    bool createNew(const QString &contents);
    bool open(QString *errorString, const QString &fileName, const QString &realFileName);
    Core::IDocument *document();
    QString displayName() const;
    void setDisplayName(const QString &title);
    bool duplicateSupported() const;
    Core::IEditor *duplicate(QWidget *parent);
    Core::Id id() const;
    bool isTemporary() const { return true; }
    DiffEditorWidget *editorWidget() const { return m_editorWidget; }

    QWidget *toolBar();

    QByteArray saveState() const;
    bool restoreState(const QByteArray &state);

private:
    DiffFile *m_file;
    DiffEditorWidget *m_editorWidget;
    QToolBar *m_toolWidget;
    mutable QString m_displayName;
};

class DiffFile : public Core::IDocument
{
    Q_OBJECT
public:
    explicit DiffFile(const QString &mimeType,
                              QObject *parent = 0);

    QString fileName() const { return m_fileName; }
    QString defaultPath() const { return QString(); }
    QString suggestedFileName() const { return QString(); }

    bool isModified() const { return m_modified; }
    QString mimeType() const;
    bool isSaveAsAllowed() const { return false; }
    bool save(QString *errorString, const QString &fileName, bool autoSave);
    ReloadBehavior reloadBehavior(ChangeTrigger state, ChangeType type) const;
    bool reload(QString *errorString, ReloadFlag flag, ChangeType type);
    void rename(const QString &newName);

    void setFileName(const QString &name);
    void setModified(bool modified = true);

signals:
    void saveMe(QString *errorString, const QString &fileName, bool autoSave);

private:
    const QString m_mimeType;
    bool m_modified;
    QString m_fileName;
};

class DiffEditorPlugin : public ExtensionSystem::IPlugin
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QtCreatorPlugin" FILE "DiffEditor.json")

public:
    DiffEditorPlugin();
    ~DiffEditorPlugin();

    bool initialize(const QStringList &arguments, QString *errorMessage = 0);
    void extensionsInitialized();

    // Connect editor to settings changed signals.
    void initializeEditor(DiffEditorWidget *editor);

private slots:
    void diff();

private:
    DiffEditorWidget *getDiffEditorWidget(const Core::IEditor *editor) const;
    QString getFileContents(const QString &fileName, QTextCodec *codec) const;

};

class DiffEditorFactory : public Core::IEditorFactory
{
    Q_OBJECT

public:
    explicit DiffEditorFactory(DiffEditorPlugin *owner);

    QStringList mimeTypes() const;
    Core::IEditor *createEditor(QWidget *parent);
    Core::Id id() const;
    QString displayName() const;

private:
    const QStringList m_mimeTypes;
    DiffEditorPlugin *m_owner;
};

} // namespace Internal
} // namespace DIFFEditor

#endif // DIFFEDITORPLUGIN_H