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#ifndef CPPFUNCTIONDECLDEFLINK_H
#define CPPFUNCTIONDECLDEFLINK_H

#include "cppquickfix.h"

#include <cplusplus/CppDocument.h>
#include <cplusplus/ASTfwd.h>

#include <cpptools/cpprefactoringchanges.h>
#include <utils/changeset.h>

#include <QString>
#include <QCoreApplication>
#include <QSharedPointer>
#include <QFutureWatcher>
#include <QTextCursor>

namespace CppEditor {
namespace Internal {

class CPPEditorWidget;
class FunctionDeclDefLink;

class FunctionDeclDefLinkFinder : public QObject
{
    Q_OBJECT
public:
    FunctionDeclDefLinkFinder(QObject *parent = 0);

    void startFindLinkAt(QTextCursor cursor,
                    const CPlusPlus::Document::Ptr &doc,
                    const CPlusPlus::Snapshot &snapshot);

    QTextCursor scannedSelection() const;

signals:
    void foundLink(QSharedPointer<FunctionDeclDefLink> link);

private slots:
    void onFutureDone();

private:
    QTextCursor m_scannedSelection;
    QTextCursor m_nameSelection;
    QFutureWatcher<QSharedPointer<FunctionDeclDefLink> > m_watcher;
};

class FunctionDeclDefLink
{
    Q_DECLARE_TR_FUNCTIONS(CppEditor::Internal::FunctionDeclDefLink)
    Q_DISABLE_COPY(FunctionDeclDefLink)
public:
    ~FunctionDeclDefLink();

    class Marker {};

    bool isValid() const;
    bool isMarkerVisible() const;

    void apply(CPPEditorWidget *editor, bool jumpToMatch);
    void hideMarker(CPPEditorWidget *editor);
    void showMarker(CPPEditorWidget *editor);
    Utils::ChangeSet changes(const CPlusPlus::Snapshot &snapshot, int targetOffset = -1);

    QTextCursor linkSelection;

    // stored to allow aborting when the name is changed
    QTextCursor nameSelection;
    QString nameInitial;

    // The 'source' prefix denotes information about the original state
    // of the function before the user did any edits.
    CPlusPlus::Document::Ptr sourceDocument;
    CPlusPlus::Function *sourceFunction;
    CPlusPlus::DeclarationAST *sourceDeclaration;
    CPlusPlus::FunctionDeclaratorAST *sourceFunctionDeclarator;

    // The 'target' prefix denotes information about the remote declaration matching
    // the 'source' declaration, where we will try to apply the user changes.
    // 1-based line and column
    unsigned targetLine;
    unsigned targetColumn;
    QString targetInitial;

    CppTools::CppRefactoringFileConstPtr targetFile;
    CPlusPlus::Function *targetFunction;
    CPlusPlus::DeclarationAST *targetDeclaration;
    CPlusPlus::FunctionDeclaratorAST *targetFunctionDeclarator;

private:
    FunctionDeclDefLink();

    bool hasMarker;

    friend class FunctionDeclDefLinkFinder;
};

class ApplyDeclDefLinkChanges: public CppQuickFixFactory
{
public:
    virtual QList<CppQuickFixOperation::Ptr>
        match(const QSharedPointer<const Internal::CppQuickFixAssistInterface> &interface);
};

} // namespace Internal
} // namespace CppEditor

Q_DECLARE_METATYPE(CppEditor::Internal::FunctionDeclDefLink::Marker)

#endif // CPPFUNCTIONDECLDEFLINK_H