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#include "memoryagent.h"

#include "debuggerengine.h"
#include "debuggercore.h"

#include <coreplugin/coreconstants.h>
#include <coreplugin/editormanager/editormanager.h>
#include <coreplugin/editormanager/ieditor.h>
#include <coreplugin/icore.h>

#include <utils/qtcassert.h>

#include <QtGui/QMessageBox>

using namespace Core;

namespace Debugger {
namespace Internal {

///////////////////////////////////////////////////////////////////////
//
// MemoryAgent
//
///////////////////////////////////////////////////////////////////////

/*!
    \class Debugger::Internal::MemoryAgent

    Objects form this class are created in response to user actions in
    the Gui for showing raw memory from the inferior. After creation
    it handles communication between the engine and the bineditor.
*/

namespace { const int DataRange = 1024 * 1024; }

MemoryAgent::MemoryAgent(Debugger::DebuggerEngine *engine)
    : QObject(engine), m_engine(engine)
{
    QTC_ASSERT(engine, /**/);
}

MemoryAgent::~MemoryAgent()
{
    QList<IEditor *> editors;
    foreach (QPointer<IEditor> editor, m_editors)
        if (editor)
            editors.append(editor.data());
    EditorManager::instance()->closeEditors(editors);
}

void MemoryAgent::createBinEditor(quint64 addr)
{
    EditorManager *editorManager = EditorManager::instance();
    QString titlePattern = tr("Memory $");
    IEditor *editor = editorManager->openEditorWithContents(
        Core::Constants::K_DEFAULT_BINARY_EDITOR_ID,
        &titlePattern);
    editorManager->activateEditor(editor);
    if (editor) {
        editor->setProperty(Debugger::Constants::OPENED_BY_DEBUGGER, true);
        editor->setProperty(Debugger::Constants::OPENED_WITH_MEMORY, true);
        connect(editor->widget(),
            SIGNAL(lazyDataRequested(Core::IEditor *, quint64,bool)),
            SLOT(fetchLazyData(Core::IEditor *, quint64,bool)));
        connect(editor->widget(),
            SIGNAL(newWindowRequested(quint64)),
            SLOT(createBinEditor(quint64)));
        connect(editor->widget(),
            SIGNAL(newRangeRequested(Core::IEditor *, quint64)),
            SLOT(provideNewRange(Core::IEditor*,quint64)));
        connect(editor->widget(),
            SIGNAL(startOfFileRequested(Core::IEditor *)),
            SLOT(handleStartOfFileRequested(Core::IEditor*)));
        connect(editor->widget(),
            SIGNAL(endOfFileRequested(Core::IEditor *)),
            SLOT(handleEndOfFileRequested(Core::IEditor*)));
        m_editors << editor;
        QMetaObject::invokeMethod(editor->widget(), "setNewWindowRequestAllowed");
        QMetaObject::invokeMethod(editor->widget(), "setLazyData",
            Q_ARG(quint64, addr), Q_ARG(int, DataRange), Q_ARG(int, BinBlockSize));
    } else {
        showMessageBox(QMessageBox::Warning,
            tr("No memory viewer available"),
            tr("The memory contents cannot be shown as no viewer plugin "
               "for binary data has been loaded."));
        deleteLater();
    }
}

void MemoryAgent::fetchLazyData(IEditor *editor, quint64 block, bool sync)
{
    Q_UNUSED(sync); // FIXME: needed support for incremental searching
    m_engine->fetchMemory(this, editor, BinBlockSize * block, BinBlockSize);
}

void MemoryAgent::addLazyData(QObject *editorToken, quint64 addr,
                                  const QByteArray &ba)
{
    IEditor *editor = qobject_cast<IEditor *>(editorToken);
    if (editor && editor->widget()) {
        QMetaObject::invokeMethod(editor->widget(), "addLazyData",
            Q_ARG(quint64, addr / BinBlockSize), Q_ARG(QByteArray, ba));
    }
}

void MemoryAgent::provideNewRange(IEditor *editor, quint64 address)
{
    QMetaObject::invokeMethod(editor->widget(), "setLazyData",
        Q_ARG(quint64, address), Q_ARG(int, DataRange),
        Q_ARG(int, BinBlockSize));
}

// Since we are not dealing with files, we take these signals to mean
// "move to start/end of range". This seems to make more sense than
// jumping to the start or end of the address space, respectively.
void MemoryAgent::handleStartOfFileRequested(IEditor *editor)
{
    QMetaObject::invokeMethod(editor->widget(),
        "setCursorPosition", Q_ARG(int, 0));
}

void MemoryAgent::handleEndOfFileRequested(IEditor *editor)
{
    QMetaObject::invokeMethod(editor->widget(),
        "setCursorPosition", Q_ARG(int, DataRange - 1));
}

void MemoryAgent::updateContents()
{
    foreach (QPointer<IEditor> editor, m_editors)
        if (editor)
            QMetaObject::invokeMethod(editor->widget(), "updateContents");
}

bool MemoryAgent::hasVisibleEditor() const
{
    QList<IEditor *> visible = EditorManager::instance()->visibleEditors();
    foreach (QPointer<IEditor> editor, m_editors)
        if (visible.contains(editor.data()))
            return true;
    return false;
}

} // namespace Internal
} // namespace Debugger