/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
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**
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** 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.
**
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#include "registerhandler.h"

#include "debuggeractions.h"
#include "debuggeragents.h"
#include "debuggerconstants.h"
#include "debuggerengine.h"

#include <utils/qtcassert.h>

#include <QtCore/QAbstractTableModel>
#include <QtCore/QDebug>

#include <QtGui/QColor>

using namespace Debugger;
using namespace Debugger::Internal;
using namespace Debugger::Constants;


//////////////////////////////////////////////////////////////////
//
// RegisterHandler
//
//////////////////////////////////////////////////////////////////

RegisterHandler::RegisterHandler(DebuggerEngine *engine)
  : m_engine(engine)
{
    setNumberBase(16);
}

int RegisterHandler::rowCount(const QModelIndex &parent) const
{
    return parent.isValid() ? 0 : m_registers.size();
}

int RegisterHandler::columnCount(const QModelIndex &parent) const
{
    return parent.isValid() ? 0 : 2;
}

inline QString RegisterHandler::value(const Register &reg, bool padded) const
{
    bool ok = true;
    // Try to convert to number?
    const qulonglong value = reg.value.toULongLong(&ok, 0); // Autodetect format
    if (ok)
        return QString::fromAscii("%1").arg(value, (padded ? m_strlen : 0), m_base);
    // Cannot convert, return raw string.
    if (padded && reg.value.size() < m_strlen)
        return QString(m_strlen - reg.value.size(), QLatin1Char(' ')) + reg.value;
    return reg.value;
}

QVariant RegisterHandler::data(const QModelIndex &index, int role) const
{
    switch (role) {
        case EngineStateRole:
            return m_engine->state();

        case EngineCapabilitiesRole:
            return m_engine->debuggerCapabilities();

        case EngineActionsEnabledRole:
            return m_engine->debuggerActionsEnabled();

        case RegisterNumberBaseRole:
            return m_base;
    }

    if (!index.isValid() || index.row() >= m_registers.size())
        return QVariant();

    const Register &reg = m_registers.at(index.row());

    switch (role) {
    case RegisterAddressRole: {
        // Return some address associated with the register. Autodetect format
        bool ok = true;
        qulonglong value = reg.value.toULongLong(&ok, 0);
        return ok ? QVariant(QString::fromLatin1("0x") + QString::number(value, 16)) : QVariant();
    }
        break;

    case Qt::DisplayRole:
        switch (index.column()) {
        case 0: {
            const QString padding = QLatin1String("  ");
            return QVariant(padding + reg.name + padding);
        }
        case 1: // Display: Pad value for alignment
            return value(reg, true);
        } // switch column
    case Qt::EditRole: // Edit: Unpadded for editing
        return value(reg, false);
    case Qt::TextAlignmentRole:
        return index.column() == 1 ? QVariant(Qt::AlignRight) : QVariant();
    case RegisterChangedRole:
        return QVariant(reg.changed);
    default:
        break;
    }
    return QVariant();
}

QVariant RegisterHandler::headerData(int section, Qt::Orientation orientation,
    int role) const
{
    if (orientation == Qt::Horizontal && role == Qt::DisplayRole) {
        switch (section) {
            case 0: return tr("Name");
            case 1: return tr("Value (base %1)").arg(m_base);
        };
    }
    return QVariant();
}

Qt::ItemFlags RegisterHandler::flags(const QModelIndex &idx) const
{
    using namespace Qt;

    if (!idx.isValid())
        return ItemFlags();

    static const ItemFlags notEditable =
          ItemIsSelectable
        // | ItemIsDragEnabled
        // | ItemIsDropEnabled
        | ItemIsEnabled;

    static const ItemFlags editable = notEditable | ItemIsEditable;

    if (idx.column() == 1)
        return editable; // locals and watcher values are editable
    return  notEditable;
}

bool RegisterHandler::setData(const QModelIndex &index, const QVariant &value, int role)
{
    switch (role) {
        case RequestSetRegisterRole:
            m_engine->setRegisterValue(index.row(), value.toString());
            return true;

        case RequestReloadRegistersRole:
            m_engine->reloadRegisters();
            return true;

        case RequestShowMemoryRole:
            (void) new MemoryViewAgent(m_engine, value.toString());
            return true;

        default:
            return QAbstractTableModel::setData(index, value, role);
    }
}

void RegisterHandler::removeAll()
{
    m_registers.clear();
    reset();
}

bool RegisterHandler::isEmpty() const
{
    return m_registers.isEmpty();
}

void RegisterHandler::setRegisters(const Registers &registers)
{
    m_registers = registers;
    calculateWidth();
    reset();
}

void RegisterHandler::setAndMarkRegisters(const Registers &registers)
{
    const Registers old = m_registers;
    m_registers = registers;
    for (int i = qMin(m_registers.size(), old.size()); --i >= 0; )
        m_registers[i].changed = m_registers[i].value != old[i].value;
    calculateWidth();
    reset();
}

Registers RegisterHandler::registers() const
{
    return m_registers;
}

void RegisterHandler::calculateWidth()
{
    m_strlen = (m_base == 2 ? 64 : m_base == 8 ? 32 : m_base == 10 ? 26 : 16);
}

void RegisterHandler::setNumberBase(int base)
{
    if (m_base != base) {
        m_base = base;
        calculateWidth();
        emit reset();
    }
}