/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
**
**************************************************************************/

#ifndef DEBUGGER_GDBENGINE_H
#define DEBUGGER_GDBENGINE_H

#include "idebuggerengine.h"
#include "debuggermanager.h" // only for StartParameters
#include "gdbmi.h"
#include "watchutils.h"
#include "outputcollector.h"

#include <QtCore/QByteArray>
#include <QtCore/QHash>
#include <QtCore/QMap>
#include <QtCore/QObject>
#include <QtCore/QProcess>
#include <QtCore/QPoint>
#include <QtCore/QSet>
#include <QtCore/QTextCodec>
#include <QtCore/QTime>
#include <QtCore/QVariant>

QT_BEGIN_NAMESPACE
class QAction;
class QAbstractItemModel;
class QWidget;
class QMainWindow;
QT_END_NAMESPACE

namespace Debugger {
class DebuggerManager;
namespace Internal {

class AbstractGdbAdapter;
class GdbResponse;
class GdbMi;

class BreakpointData;
class WatchData;

class AttachGdbAdapter;
class CoreGdbAdapter;
class PlainGdbAdapter;
class RemoteGdbAdapter;
class TrkGdbAdapter;

enum DebuggingHelperState
{
    DebuggingHelperUninitialized,
    DebuggingHelperLoadTried,
    DebuggingHelperAvailable,
    DebuggingHelperUnavailable,
};

class GdbEngine : public IDebuggerEngine
{
    Q_OBJECT

public:
    explicit GdbEngine(DebuggerManager *manager);
    ~GdbEngine();

signals:
    void gdbInputAvailable(int channel, const QString &msg);
    void gdbOutputAvailable(int channel, const QString &msg);
    void applicationOutputAvailable(const QString &output);

private:
    friend class AttachGdbAdapter;
    friend class CoreGdbAdapter;
    friend class PlainGdbAdapter;
    friend class RemoteGdbAdapter;
    friend class TrkGdbAdapter;

    //
    // IDebuggerEngine implementation
    //
    void stepExec();
    void stepOutExec();
    void nextExec();
    void stepIExec();
    void nextIExec();

    void shutdown();
    void setToolTipExpression(const QPoint &mousePos, TextEditor::ITextEditor *editor, int cursorPos);
    void startDebugger(const DebuggerStartParametersPtr &sp);
    void exitDebugger();
    void detachDebugger();

    void continueInferior();
    void interruptInferior();

    void runToLineExec(const QString &fileName, int lineNumber);
    void runToFunctionExec(const QString &functionName);
    void jumpToLineExec(const QString &fileName, int lineNumber);

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

    Q_SLOT void attemptBreakpointSynchronization();

    void assignValueInDebugger(const QString &expr, const QString &value);
    void executeDebuggerCommand(const QString & command);
    void watchPoint(const QPoint &);

    void loadSymbols(const QString &moduleName);
    void loadAllSymbols();
    virtual QList<Symbol> moduleSymbols(const QString &moduleName);

    void fetchMemory(MemoryViewAgent *agent, quint64 addr, quint64 length);
    void handleFetchMemory(const GdbResponse &response);

    void fetchDisassembler(DisassemblerViewAgent *agent,
        const StackFrame &frame);
    void fetchDisassemblerByAddress(DisassemblerViewAgent *agent,
        bool useMixedMode);
    void handleFetchDisassemblerByLine(const GdbResponse &response);
    void handleFetchDisassemblerByAddress1(const GdbResponse &response);
    void handleFetchDisassemblerByAddress0(const GdbResponse &response);

    Q_SLOT void setDebugDebuggingHelpers(const QVariant &on);
    Q_SLOT void setUseDebuggingHelpers(const QVariant &on);

    //
    // Own stuff
    //

    int currentFrame() const;

    bool supportsThreads() const;
    void gotoLocation(const StackFrame &frame, bool setLocationMarker);

    void connectAdapter();
    void disconnectAdapter();
    void initializeVariables();
    QString fullName(const QString &fileName);
    // get one usable name out of these, try full names first
    QString fullName(const QStringList &candidates);

    void handleResult(const GdbResponse &response);

public: // otherwise the Qt flag macros are unhappy
    enum GdbCommandFlag {
        NoFlags = 0,
        NeedsStop = 1,
        Discardable = 2,
        RebuildModel = 4,
        WatchUpdate = Discardable | RebuildModel,
        EmbedToken = 8
    };
    Q_DECLARE_FLAGS(GdbCommandFlags, GdbCommandFlag)


private:
    typedef void (GdbEngine::*GdbCommandCallback)
        (const GdbResponse &response);
    typedef void (AbstractGdbAdapter::*AdapterCallback)
        (const GdbResponse &response);

    struct GdbCommand
    {
        GdbCommand()
            : flags(0), callback(0), adapterCallback(0), callbackName(0)
        {}

        int flags;
        GdbCommandCallback callback;
        AdapterCallback adapterCallback;
        const char *callbackName;
        QString command;
        QVariant cookie;
        QTime postTime;
    };

    // type and cookie are sender-internal data, opaque for the "event
    // queue". resultNeeded == true increments m_pendingResults on
    // send and decrements on receipt, effectively preventing
    // watch model updates before everything is finished.
    void flushCommand(const GdbCommand &cmd);
    void postCommand(const QString &command,
                     GdbCommandFlags flags,
                     GdbCommandCallback callback = 0,
                     const char *callbackName = 0,
                     const QVariant &cookie = QVariant());
    void postCommand(const QString &command,
                     GdbCommandCallback callback = 0,
                     const char *callbackName = 0,
                     const QVariant &cookie = QVariant());
    void postCommand(const QString &command,
                     AdapterCallback callback,
                     const char *callbackName,
                     const QVariant &cookie = QVariant());
    void postCommand(const QString &command,
                     GdbCommandFlags flags,
                     AdapterCallback callback,
                     const char *callbackName,
                     const QVariant &cookie = QVariant());
    void postCommandHelper(const GdbCommand &cmd);
    void setTokenBarrier();

    void updateAll();
    void updateLocals();

private slots:
    QString errorMessage(QProcess::ProcessError error);
    void readGdbStandardOutput();
    void readGdbStandardError();
    void readDebugeeOutput(const QByteArray &data);

    void handleAdapterStarted();
    void handleAdapterStartFailed(const QString &msg);

    void handleInferiorPrepared();
    void handleInferiorPreparationFailed(const QString &msg);
    void handleInferiorStartFailed(const QString &msg);
    void handleInferiorShutDown();
    void handleInferiorShutdownFailed(const QString &msg);

    void handleAdapterCrashed(const QString &msg);
    void handleAdapterShutDown();
    void handleAdapterShutdownFailed(const QString &msg);

private:
    int terminationIndex(const QByteArray &buffer, int &length);
    void handleResponse(const QByteArray &buff);
    void handleStart(const GdbResponse &response);
    void handleAsyncOutput(const GdbMi &data);
    void handleStop1(const GdbResponse &response);
    void handleStop2(const GdbResponse &response);
    void handleStop2(const GdbMi &data);
    void handleResultRecord(const GdbResponse &response);
    void handleFileExecAndSymbols(const GdbResponse &response);
    void handleExecContinue(const GdbResponse &response);
    void handleExecJumpToLine(const GdbResponse &response);
    void handleExecRunToFunction(const GdbResponse &response);
    void handleInfoShared(const GdbResponse &response);
    void handleShowVersion(const GdbResponse &response);
    void handleQueryPwd(const GdbResponse &response);
    void handleQuerySources(const GdbResponse &response);
    void handleWatchPoint(const GdbResponse &response);
    bool showToolTip();

    // Convenience
    QMainWindow *mainWindow() const;
    DebuggerStartMode startMode() const;
    qint64 inferiorPid() const { return m_manager->inferiorPid(); }

    void handleChildren(const WatchData &parent, const GdbMi &child,
        QList<WatchData> *insertions);
    const bool m_dumperInjectionLoad;

    QTextCodec *m_outputCodec;
    QTextCodec::ConverterState m_outputCodecState;

    QByteArray m_inbuffer;

    QHash<int, GdbCommand> m_cookieForToken;
    QHash<int, QByteArray> m_customOutputForToken;

    QByteArray m_pendingConsoleStreamOutput;
    QByteArray m_pendingTargetStreamOutput;
    QByteArray m_pendingLogStreamOutput;

    // contains the first token number for the current round
    // of evaluation. Responses with older tokens are considers
    // out of date and discarded.
    int m_oldestAcceptableToken;

    int m_gdbVersion; // 6.8.0 is 680
    int m_gdbBuildVersion; // MAC only?

    // awful hack to keep track of used files
    QMap<QString, QString> m_shortToFullName;
    QMap<QString, QString> m_fullToShortName;

    //
    // Breakpoint specific stuff
    //
    void handleBreakList(const GdbResponse &response);
    void handleBreakList(const GdbMi &table);
    void handleBreakIgnore(const GdbResponse &response);
    void handleBreakInsert(const GdbResponse &response);
    void handleBreakInsert1(const GdbResponse &response);
    void handleBreakCondition(const GdbResponse &response);
    void handleBreakInfo(const GdbResponse &response);
    void extractDataFromInfoBreak(const QString &output, BreakpointData *data);
    void breakpointDataFromOutput(BreakpointData *data, const GdbMi &bkpt);
    void sendInsertBreakpoint(int index);

    //
    // Modules specific stuff
    //
    void reloadModules();
    void handleModulesList(const GdbResponse &response);


    //
    // Register specific stuff
    //
    Q_SLOT void reloadRegisters();
    void setRegisterValue(int nr, const QString &value);
    void handleRegisterListNames(const GdbResponse &response);
    void handleRegisterListValues(const GdbResponse &response);

    //
    // Source file specific stuff
    //
    void reloadSourceFiles();

    //
    // Stack specific stuff
    //
    void handleStackListFrames(const GdbResponse &response);
    void handleStackSelectThread(const GdbResponse &response);
    void handleStackListThreads(const GdbResponse &response);
    Q_SLOT void reloadStack();
    Q_SLOT void reloadFullStack();


    //
    // Tooltip specific stuff
    //
    void sendToolTipCommand(const QString &command, const QString &cookie);


    //
    // Watch specific stuff
    //
    // FIXME: BaseClass. called to improve situation for a watch item
    void updateSubItem(const WatchData &data);

    void updateWatchData(const WatchData &data);
    Q_SLOT void updateWatchDataHelper(const WatchData &data);
    void rebuildModel();

    void insertData(const WatchData &data);
    void sendWatchParameters(const QByteArray &params0);
    void createGdbVariable(const WatchData &data);

    void maybeHandleInferiorPidChanged(const QString &pid);

    void tryLoadDebuggingHelpers();
    void tryQueryDebuggingHelpers();
    Q_SLOT void recheckDebuggingHelperAvailability();
    void runDebuggingHelper(const WatchData &data, bool dumpChildren);
    void runDirectDebuggingHelper(const WatchData &data, bool dumpChildren);
    bool hasDebuggingHelperForType(const QString &type) const;

    void handleVarListChildren(const GdbResponse &response);
    void handleVarCreate(const GdbResponse &response);
    void handleVarAssign(const GdbResponse &response);
    void handleEvaluateExpression(const GdbResponse &response);
    //void handleToolTip(const GdbResponse &response);
    void handleQueryDebuggingHelper(const GdbResponse &response);
    void handleDebuggingHelperValue1(const GdbResponse &response);
    void handleDebuggingHelperValue2(const GdbResponse &response);
    void handleDebuggingHelperValue3(const GdbResponse &response);
    void handleDebuggingHelperEditValue(const GdbResponse &response);
    void handleDebuggingHelperSetup(const GdbResponse &response);
    void handleStackListLocals(const GdbResponse &response);
    void handleStackListArguments(const GdbResponse &response);
    void handleVarListChildrenHelper(const GdbMi &child,
        const WatchData &parent);
    void setWatchDataType(WatchData &data, const GdbMi &mi);
    void setWatchDataDisplayedType(WatchData &data, const GdbMi &mi);
    void setLocals(const QList<GdbMi> &locals);
    void connectDebuggingHelperActions();
    void disconnectDebuggingHelperActions();
    AbstractGdbAdapter *determineAdapter(const DebuggerStartParametersPtr &dp) const;

    bool startModeAllowsDumpers() const;
    QString parseDisassembler(const GdbMi &lines);

    int m_pendingRequests;
    QSet<QString> m_processedNames;

    QtDumperHelper m_dumperHelper;

    DebuggingHelperState m_debuggingHelperState;
    QList<GdbMi> m_currentFunctionArgs;
    QString m_currentFrame;
    QMap<QString, QString> m_varToType;

    typedef void (GdbEngine::*Continuation)();
    // function called after all previous responses have been received
    Continuation m_continuationAfterDone;
    void startInferior();

    bool m_modulesListOutdated;

    QList<GdbCommand> m_commandsToRunOnTemporaryBreak;

    DebuggerStartParametersPtr m_startParameters;
    // make sure to re-initialize new members in initializeVariables();

    // only one of those is active at a given time, available in m_gdbAdapter
    AbstractGdbAdapter *m_gdbAdapter;  // pointer to one listed below
    AttachGdbAdapter *m_attachAdapter; // owned
    CoreGdbAdapter *m_coreAdapter;     // owned
    PlainGdbAdapter *m_plainAdapter;   // owned
    RemoteGdbAdapter *m_remoteAdapter; // owned
    TrkGdbAdapter *m_trkAdapter;       // owned

    friend class AbstractGdbAdapter;

public:
    void showMessageBox(int icon, const QString &title, const QString &text);
    void debugMessage(const QString &msg);
    void addOptionPages(QList<Core::IOptionsPage*> *opts) const;
    const DebuggerStartParameters &startParameters() const
        { return *m_startParameters; }

    OutputCollector m_outputCollector;
};

} // namespace Internal
} // namespace Debugger

Q_DECLARE_OPERATORS_FOR_FLAGS(Debugger::Internal::GdbEngine::GdbCommandFlags)

#endif // DEBUGGER_GDBENGINE_H