/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
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** accordance with the commercial license agreement provided with the
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
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#pragma once

#include "cpptools_global.h"

#include <QFutureWatcher>
#include <QScopedPointer>
#include <QTextCharFormat>

#include <functional>

namespace TextEditor {
class HighlightingResult;
class TextDocument;
}

namespace CppTools {

class CPPTOOLS_EXPORT SemanticHighlighter : public QObject
{
    Q_OBJECT

public:
    enum Kind {
        Unknown = 0,
        TypeUse,
        LocalUse,
        FieldUse,
        EnumerationUse,
        VirtualMethodUse,
        LabelUse,
        MacroUse,
        FunctionUse,
        PseudoKeywordUse,
        StringUse,
        FunctionDeclarationUse,
        VirtualFunctionDeclarationUse,
    };

    using HighlightingRunner = std::function<QFuture<TextEditor::HighlightingResult> ()>;

public:
    explicit SemanticHighlighter(TextEditor::TextDocument *baseTextDocument);
    ~SemanticHighlighter() override;

    void setHighlightingRunner(HighlightingRunner highlightingRunner);
    void updateFormatMapFromFontSettings();

    void run();

private:
    void onHighlighterResultAvailable(int from, int to);
    void onHighlighterFinished();

    void connectWatcher();
    void disconnectWatcher();

    unsigned documentRevision() const;

private:
    TextEditor::TextDocument *m_baseTextDocument;

    unsigned m_revision = 0;
    QScopedPointer<QFutureWatcher<TextEditor::HighlightingResult>> m_watcher;
    QHash<int, QTextCharFormat> m_formatMap;

    HighlightingRunner m_highlightingRunner;
};

} // namespace CppTools