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** Copyright (C) 2017 The Qt Company Ltd.
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** General Public License version 3 as published by the Free Software
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#pragma once

#include <cppeditor/cppcursorinfo.h>
#include <cppeditor/cpptoolsreuse.h>
#include <cppeditor/baseeditordocumentprocessor.h>

#include <clangsupport/clangcodemodelclientinterface.h>

#include <QFuture>
#include <QPointer>
#include <QTextDocument>

namespace TextEditor {
class IAssistProcessor;
class TextEditorWidget;
} // namespace TextEditor

namespace ClangCodeModel {
namespace Internal {

class ClangCompletionAssistProcessor;

class BackendReceiver : public ClangBackEnd::ClangCodeModelClientInterface
{
public:
    BackendReceiver();
    ~BackendReceiver() override;

    using AliveHandler = std::function<void ()>;
    void setAliveHandler(const AliveHandler &handler);

    void addExpectedCompletionsMessage(quint64 ticket, ClangCompletionAssistProcessor *processor);
    void cancelProcessor(TextEditor::IAssistProcessor *processor);
    void deleteProcessorsOfEditorWidget(TextEditor::TextEditorWidget *textEditorWidget);

    QFuture<CppEditor::CursorInfo>
    addExpectedReferencesMessage(quint64 ticket,
                                 const CppEditor::SemanticInfo::LocalUseMap &localUses
                                     = CppEditor::SemanticInfo::LocalUseMap());
    QFuture<CppEditor::SymbolInfo> addExpectedRequestFollowSymbolMessage(quint64 ticket);
    QFuture<CppEditor::ToolTipInfo> addExpectedToolTipMessage(quint64 ticket);
    bool isExpectingCompletionsMessage() const;

    void reset();

private:
    void alive() override;
    void echo(const ClangBackEnd::EchoMessage &message) override;
    void completions(const ClangBackEnd::CompletionsMessage &message) override;

    void annotations(const ClangBackEnd::AnnotationsMessage &message) override;
    void references(const ClangBackEnd::ReferencesMessage &message) override;
    void tooltip(const ClangBackEnd::ToolTipMessage &message) override;
    void followSymbol(const ClangBackEnd::FollowSymbolMessage &message) override;

private:
    AliveHandler m_aliveHandler;
    QHash<quint64, ClangCompletionAssistProcessor *> m_assistProcessorsTable;

    struct ReferencesEntry {
        ReferencesEntry() = default;
        ReferencesEntry(QFutureInterface<CppEditor::CursorInfo> futureInterface,
                        const CppEditor::SemanticInfo::LocalUseMap &localUses)
            : futureInterface(futureInterface)
            , localUses(localUses) {}
        QFutureInterface<CppEditor::CursorInfo> futureInterface;
        CppEditor::SemanticInfo::LocalUseMap localUses;
    };
    QHash<quint64, ReferencesEntry> m_referencesTable;
    QHash<quint64, QFutureInterface<CppEditor::ToolTipInfo>> m_toolTipsTable;
    QHash<quint64, QFutureInterface<CppEditor::SymbolInfo>> m_followTable;
};

} // namespace Internal
} // namespace ClangCodeModel
