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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 KEYWORDSCOMPLETIONASSIST_H
#define KEYWORDSCOMPLETIONASSIST_H

#include "iassistprocessor.h"
#include "basicproposalitem.h"
#include "ifunctionhintproposalmodel.h"

#include <utils/qtcoverride.h>

namespace TextEditor {

class TEXTEDITOR_EXPORT Keywords
{
public:
    Keywords();
    Keywords(const QStringList &variabels, const QStringList &functions, const QMap<QString, QStringList> &functionArgs);
    bool isVariable(const QString &word) const;
    bool isFunction(const QString &word) const;

    QStringList variables() const;
    QStringList functions() const;
    QStringList argsForFunction(const QString &function) const;

private:
    QStringList m_variables;
    QStringList m_functions;
    QMap<QString, QStringList> m_functionArgs;
};

class TEXTEDITOR_EXPORT KeywordsAssistProposalItem : public TextEditor::BasicProposalItem
{
public:
    KeywordsAssistProposalItem(Keywords keywords);
    ~KeywordsAssistProposalItem();

    bool prematurelyApplies(const QChar &c) const QTC_OVERRIDE;
    void applyContextualContent(TextEditor::BaseTextEditor *editor,
                                int basePosition) const QTC_OVERRIDE;
private:
    Keywords m_keywords;
};

class TEXTEDITOR_EXPORT KeywordsFunctionHintModel : public TextEditor::IFunctionHintProposalModel
{
public:
    KeywordsFunctionHintModel(const QStringList &functionSymbols);
    ~KeywordsFunctionHintModel();

    void reset() QTC_OVERRIDE;
    int size() const QTC_OVERRIDE;
    QString text(int index) const QTC_OVERRIDE;
    int activeArgument(const QString &prefix) const QTC_OVERRIDE;

private:
    QStringList m_functionSymbols;
};

class TEXTEDITOR_EXPORT KeywordsCompletionAssistProcessor : public TextEditor::IAssistProcessor
{
public:
    KeywordsCompletionAssistProcessor(Keywords keywords);
    ~KeywordsCompletionAssistProcessor();

    TextEditor::IAssistProposal *perform(const TextEditor::IAssistInterface *interface) QTC_OVERRIDE;
    QChar startOfCommentChar() const;

private:
    bool acceptsIdleEditor();
    int findStartOfName(int pos = -1);
    bool isInComment() const;
    void addWordsToProposalList(QList<BasicProposalItem *> *items, const QStringList &words, const QIcon &icon);

    int m_startPosition;
    QString m_word;
    QScopedPointer<const TextEditor::IAssistInterface> m_interface;
    const QIcon m_variableIcon;
    const QIcon m_functionIcon;
    Keywords m_keywords;
};

} // TextEditor

#endif // KEYWORDSCOMPLETIONASSISTPROCESSOR_H