/****************************************************************************
**
** 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 "clangcompletionassistinterface.h"

#include <cpptools/cppcompletionassistprocessor.h>

#include <clangsupport/codecompletion.h>

#include <QCoreApplication>
#include <QTextCursor>

namespace ClangCodeModel {
namespace Internal {

using ClangBackEnd::CodeCompletions;
using ClangBackEnd::CompletionCorrection;

class ClangCompletionAssistProcessor : public CppTools::CppCompletionAssistProcessor
{
    Q_DECLARE_TR_FUNCTIONS(ClangCodeModel::Internal::ClangCompletionAssistProcessor)

public:
    ClangCompletionAssistProcessor();
    ~ClangCompletionAssistProcessor() override;

    TextEditor::IAssistProposal *perform(const TextEditor::AssistInterface *interface) override;

    void handleAvailableCompletions(const CodeCompletions &completions);
    bool running() final { return m_requestSent; }

    const TextEditor::TextEditorWidget *textEditorWidget() const;

private:
    void cancel() override;
    TextEditor::IAssistProposal *startCompletionHelper();
    int startOfOperator(int pos, unsigned *kind, bool wantFunctionCall) const;
    int findStartOfName(int pos = -1) const;
    bool accepts() const;

    TextEditor::IAssistProposal *createProposal();
    TextEditor::IAssistProposal *createFunctionHintProposal(
            const CodeCompletions &completions);

    QList<TextEditor::AssistProposalItemInterface *> toAssistProposalItems(
            const CodeCompletions &completions) const;
    bool completeInclude(const QTextCursor &cursor);
    bool completeInclude(int position);
    void completeIncludePath(const QString &realPath, const QStringList &suffixes);
    bool completePreprocessorDirectives();
    bool completeDoxygenKeywords();
    void addCompletionItem(const QString &text,
                           const QIcon &icon = QIcon(),
                           int order = 0);

    struct UnsavedFileContentInfo {
        QByteArray unsavedContent;
        bool isDocumentModified = false;
    };
    UnsavedFileContentInfo unsavedFileContent(const QByteArray &customFileContent) const;

    void sendFileContent(const QByteArray &customFileContent);
    bool sendCompletionRequest(int position,
                               const QByteArray &customFileContent,
                               int functionNameStartPosition = -1);

    CodeCompletions applyCompletionFixIt(const CodeCompletions &completions);

private:
    struct Position { int line; int column; };
    Position extractLineColumn(int position);

    QScopedPointer<const ClangCompletionAssistInterface> m_interface;
    unsigned m_completionOperator;
    enum CompletionRequestType { NormalCompletion, FunctionHintCompletion };
    CompletionRequestType m_sentRequestType = NormalCompletion;
    int m_position = -1;
    QByteArray m_content;
    bool m_requestSent = false;
    bool m_addSnippets = false; // For type == Type::NormalCompletion
    bool m_fallbackToNormalCompletion = true;
};

} // namespace Internal
} // namespace ClangCodeModel
