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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.
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** use the contact form at http://qt.digia.com/contact-us.
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** 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
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****************************************************************************/

#ifndef DEBUGGER_LLDBENGINE
#define DEBUGGER_LLDBENGINE

#include <debugger/debuggerengine.h>
#include <debugger/disassembleragent.h>
#include <debugger/memoryagent.h>
#include <debugger/watchhandler.h>

#include <utils/consoleprocess.h>

#include <QPointer>
#include <QProcess>
#include <QQueue>
#include <QMap>
#include <QStack>
#include <QVariant>


namespace Debugger {
namespace Internal {

class WatchData;
class GdbMi;

/* A debugger engine interfacing the LLDB debugger
 * using its Python interface.
 */

class LldbEngine : public DebuggerEngine
{
    Q_OBJECT

public:
    explicit LldbEngine(const DebuggerStartParameters &startParameters);
    ~LldbEngine();

private:
    // Convenience struct to build up backend commands.
    struct Command
    {
        Command() {}
        Command(const char *f) : function(f) {}

        const Command &arg(const char *name) const;
        const Command &arg(const char *name, int value) const;
        const Command &arg(const char *name, qlonglong value) const;
        const Command &arg(const char *name, qulonglong value) const;
        const Command &arg(const char *name, const QString &value) const;
        const Command &arg(const char *name, const QByteArray &value) const;
        const Command &arg(const char *name, const char *value) const;
        const Command &beginList(const char *name = 0) const;
        void endList() const;
        const Command &beginGroup(const char *name = 0) const;
        void endGroup() const;

        static QByteArray toData(const QList<QByteArray> &value);
        static QByteArray toData(const QHash<QByteArray, QByteArray> &value);

        QByteArray function;
        mutable QByteArray args;
        private:
        const Command &argHelper(const char *name, const QByteArray &value) const;
    };

    // DebuggerEngine implementation
    void executeStep();
    void executeStepOut();
    void executeNext();
    void executeStepI();
    void executeNextI();

    void setupEngine();
    void startLldb();
    void setupInferior();
    void runEngine();
    void shutdownInferior();
    void shutdownEngine();
    void abortDebugger();
    void resetLocation();

    bool setToolTipExpression(const QPoint &mousePos,
        TextEditor::ITextEditor *editor, const DebuggerToolTipContext &);

    void continueInferior();
    void interruptInferior();

    void executeRunToLine(const ContextData &data);
    void executeRunToFunction(const QString &functionName);
    void executeJumpToLine(const ContextData &data);

    void activateFrame(int index);
    void selectThread(ThreadId threadId);

    bool acceptsBreakpoint(BreakpointModelId id) const;
    void attemptBreakpointSynchronization();
    bool attemptBreakpointSynchronizationHelper(Command *command);

    void assignValueInDebugger(const WatchData *data,
        const QString &expr, const QVariant &value);
    void executeDebuggerCommand(const QString &command, DebuggerLanguages languages);

    void loadSymbols(const QString &moduleName);
    void loadAllSymbols();
    void requestModuleSymbols(const QString &moduleName);
    void reloadModules();
    void reloadRegisters();
    void reloadSourceFiles() {}
    void reloadFullStack();
    void fetchDisassembler(Internal::DisassemblerAgent *);
    void refreshDisassembly(const GdbMi &data);

    bool supportsThreads() const { return true; }
    bool isSynchronous() const { return true; }
    void updateWatchData(const WatchData &data, const WatchUpdateFlags &flags);
    void setRegisterValue(int regnr, const QString &value);

    void fetchMemory(Internal::MemoryAgent *, QObject *, quint64 addr, quint64 length);
    void changeMemory(Internal::MemoryAgent *, QObject *, quint64 addr, const QByteArray &data);
    void refreshMemory(const GdbMi &data);

signals:
    void outputReady(const QByteArray &data);

private:
    QString errorMessage(QProcess::ProcessError error) const;
    bool hasCapability(unsigned cap) const;

    Q_SLOT void handleLldbFinished(int, QProcess::ExitStatus status);
    Q_SLOT void handleLldbError(QProcess::ProcessError error);
    Q_SLOT void readLldbStandardOutput();
    Q_SLOT void readLldbStandardError();
    Q_SLOT void handleResponse(const QByteArray &data);
    Q_SLOT void runEngine2();
    Q_SLOT void updateAll();
    Q_SLOT void updateStack();
    Q_SLOT void updateLocals();
    Q_SLOT void createFullBacktrace();
    void doUpdateLocals(UpdateParameters params);
    void refreshAll(const GdbMi &all);
    void refreshThreads(const GdbMi &threads);
    void refreshStack(const GdbMi &stack);
    void refreshStackPosition(const GdbMi &position);
    void refreshStackTop(const GdbMi &position);
    void setStackPosition(int index);
    void refreshRegisters(const GdbMi &registers);
    void refreshLocals(const GdbMi &vars);
    void refreshTypeInfo(const GdbMi &typeInfo);
    void refreshState(const GdbMi &state);
    void refreshLocation(const GdbMi &location);
    void refreshModules(const GdbMi &modules);
    void refreshSymbols(const GdbMi &symbols);
    void refreshOutput(const GdbMi &output);
    void refreshAddedBreakpoint(const GdbMi &bkpts);
    void refreshChangedBreakpoint(const GdbMi &bkpts);
    void refreshRemovedBreakpoint(const GdbMi &bkpts);
    void runContinuation(const GdbMi &data);
    void showFullBacktrace(const GdbMi &data);

    typedef void (LldbEngine::*LldbCommandContinuation)();

    void handleListLocals(const QByteArray &response);
    void handleListModules(const QByteArray &response);
    void handleListSymbols(const QByteArray &response);
    void handleBreakpointsSynchronized(const QByteArray &response);
    void updateBreakpointData(const GdbMi &bkpt, bool added);
    void handleUpdateStack(const QByteArray &response);
    void handleUpdateThreads(const QByteArray &response);

    void notifyEngineRemoteSetupDone(int portOrPid, int qmlPort);
    void notifyEngineRemoteSetupFailed(const QString &reason);

    void handleChildren(const WatchData &data0, const GdbMi &item,
        QList<WatchData> *list);

    void runCommand(const Command &cmd);
    void debugLastCommand();
    Command m_lastDebuggableCommand;

    QByteArray m_inbuffer;
    QString m_scriptFileName;
    QProcess m_lldbProc;
    QString m_lldbCmd;

    // FIXME: Make generic.
    int m_lastAgentId;
    int m_lastToken;
    int m_continueAtNextSpontaneousStop;
    QMap<QPointer<DisassemblerAgent>, int> m_disassemblerAgents;
    QMap<QPointer<MemoryAgent>, int> m_memoryAgents;
    QHash<int, QPointer<QObject> > m_memoryAgentTokens;
    QScopedPointer<DebuggerToolTipContext> m_toolTipContext;

    void showToolTip();

    // Console handling.
    Q_SLOT void stubError(const QString &msg);
    Q_SLOT void stubExited();
    Q_SLOT void stubStarted();
    bool prepareCommand();
    Utils::ConsoleProcess m_stubProc;
};

} // namespace Internal
} // namespace Debugger

#endif // DEBUGGER_LLDBENGINE
