#include "tablebottombox.hpp"

#include <sstream>

#include <QEvent>
#include <QKeyEvent>
#include <QLabel>
#include <QStackedLayout>
#include <QStatusBar>

#include <components/debug/debuglog.hpp>

#include <apps/opencs/view/world/extendedcommandconfigurator.hpp>

#include "creator.hpp"
#include "infocreator.hpp"

namespace
{
    constexpr const char* statusBarStyle = "QStatusBar::item { border: 0px }";
}

void CSVWorld::TableBottomBox::updateSize()
{
    // Make sure that the size of the bottom box is determined by the currently visible widget
    for (int i = 0; i < mLayout->count(); ++i)
    {
        QSizePolicy::Policy verPolicy = QSizePolicy::Ignored;
        if (mLayout->widget(i) == mLayout->currentWidget())
        {
            verPolicy = QSizePolicy::Expanding;
        }
        mLayout->widget(i)->setSizePolicy(QSizePolicy::Expanding, verPolicy);
    }
}

void CSVWorld::TableBottomBox::updateStatus()
{
    if (mShowStatusBar)
    {
        if (!mStatusMessage.isEmpty())
        {
            mStatus->setText(mStatusMessage);
            return;
        }

        static const char* sLabels[4] = { "record", "deleted", "touched", "selected" };
        static const char* sLabelsPlural[4] = { "records", "deleted", "touched", "selected" };

        std::ostringstream stream;

        bool first = true;

        for (int i = 0; i < 4; ++i)
        {
            if (mStatusCount[i] > 0)
            {
                if (first)
                    first = false;
                else
                    stream << ", ";

                stream << mStatusCount[i] << ' ' << (mStatusCount[i] == 1 ? sLabels[i] : sLabelsPlural[i]);
            }
        }

        if (mHasPosition)
        {
            if (!first)
                stream << " -- ";

            stream << "(" << mRow << ", " << mColumn << ")";
        }

        mStatus->setText(QString::fromUtf8(stream.str().c_str()));
    }
}

void CSVWorld::TableBottomBox::extendedConfigRequest(
    CSVWorld::ExtendedCommandConfigurator::Mode mode, const std::vector<std::string>& selectedIds)
{
    mExtendedConfigurator->configure(mode, selectedIds);
    mLayout->setCurrentWidget(mExtendedConfigurator);
    mEditMode = EditMode_ExtendedConfig;
    setVisible(true);
    mExtendedConfigurator->setFocus();
}

CSVWorld::TableBottomBox::TableBottomBox(const CreatorFactoryBase& creatorFactory, CSMDoc::Document& document,
    const CSMWorld::UniversalId& id, QWidget* parent)
    : QWidget(parent)
    , mShowStatusBar(false)
    , mEditMode(EditMode_None)
    , mHasPosition(false)
    , mRow(0)
    , mColumn(0)
{
    for (int i = 0; i < 4; ++i)
        mStatusCount[i] = 0;

    setVisible(false);

    mLayout = new QStackedLayout;
    mLayout->setContentsMargins(0, 0, 0, 0);
    connect(mLayout, &QStackedLayout::currentChanged, this, &TableBottomBox::currentWidgetChanged);

    mStatus = new QLabel;

    mStatusBar = new QStatusBar(this);

    mStatusBar->addWidget(mStatus);
    mStatusBar->setStyleSheet(statusBarStyle);

    mLayout->addWidget(mStatusBar);

    setLayout(mLayout);

    mCreator = creatorFactory.makeCreator(document, id);

    if (mCreator)
    {
        mCreator->installEventFilter(this);
        mLayout->addWidget(mCreator);

        connect(mCreator, &Creator::done, this, &TableBottomBox::requestDone);

        connect(mCreator, &Creator::requestFocus, this, &TableBottomBox::requestFocus);
    }

    mExtendedConfigurator = new ExtendedCommandConfigurator(document, id, this);
    mExtendedConfigurator->installEventFilter(this);
    mLayout->addWidget(mExtendedConfigurator);
    connect(mExtendedConfigurator, &ExtendedCommandConfigurator::done, this, &TableBottomBox::requestDone);

    updateSize();
}

bool CSVWorld::TableBottomBox::event(QEvent* event)
{
    // Apply style sheet again if style was changed
    if (event->type() == QEvent::PaletteChange)
    {
        if (mStatusBar != nullptr)
            mStatusBar->setStyleSheet(statusBarStyle);
    }

    return QWidget::event(event);
}

void CSVWorld::TableBottomBox::setEditLock(bool locked)
{
    if (mCreator)
        mCreator->setEditLock(locked);
    mExtendedConfigurator->setEditLock(locked);
}

CSVWorld::TableBottomBox::~TableBottomBox()
{
    delete mCreator;
}

bool CSVWorld::TableBottomBox::eventFilter(QObject* object, QEvent* event)
{
    if (event->type() == QEvent::KeyPress)
    {
        QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
        if (keyEvent->key() == Qt::Key_Escape)
        {
            requestDone();
            return true;
        }
    }
    return QWidget::eventFilter(object, event);
}

void CSVWorld::TableBottomBox::setStatusBar(bool show)
{
    if (show != mShowStatusBar)
    {
        setVisible(show || (mEditMode != EditMode_None));

        mShowStatusBar = show;

        if (show)
            updateStatus();
    }
}

bool CSVWorld::TableBottomBox::canCreateAndDelete() const
{
    return mCreator;
}

void CSVWorld::TableBottomBox::requestDone()
{
    if (!mShowStatusBar)
        setVisible(false);
    else
        updateStatus();

    mLayout->setCurrentWidget(mStatusBar);
    mEditMode = EditMode_None;
}

void CSVWorld::TableBottomBox::currentWidgetChanged(int /*index*/)
{
    updateSize();
}

void CSVWorld::TableBottomBox::setStatusMessage(const QString& message)
{
    mStatusMessage = message;
    updateStatus();
}

void CSVWorld::TableBottomBox::selectionSizeChanged(int size)
{
    if (mStatusCount[3] != size)
    {
        mStatusMessage = "";
        mStatusCount[3] = size;
        updateStatus();
    }
}

void CSVWorld::TableBottomBox::tableSizeChanged(int size, int deleted, int modified)
{
    bool changed = false;

    if (mStatusCount[0] != size)
    {
        mStatusCount[0] = size;
        changed = true;
    }

    if (mStatusCount[1] != deleted)
    {
        mStatusCount[1] = deleted;
        changed = true;
    }

    if (mStatusCount[2] != modified)
    {
        mStatusCount[2] = modified;
        changed = true;
    }

    if (changed)
    {
        mStatusMessage = "";
        updateStatus();
    }
}

void CSVWorld::TableBottomBox::positionChanged(int row, int column)
{
    mRow = row;
    mColumn = column;
    mHasPosition = true;
    updateStatus();
}

void CSVWorld::TableBottomBox::noMorePosition()
{
    mHasPosition = false;
    updateStatus();
}

void CSVWorld::TableBottomBox::createRequest()
{
    mCreator->reset();
    mCreator->toggleWidgets(true);
    mLayout->setCurrentWidget(mCreator);
    setVisible(true);
    mEditMode = EditMode_Creation;
    mCreator->focus();
}

void CSVWorld::TableBottomBox::createRecordsDirectlyRequest(const std::string& id)
{
    if (InfoCreator* creator = dynamic_cast<InfoCreator*>(mCreator))
    {
        creator->reset();
        creator->setText(id);
        creator->callReturnPressed();
    }
    else
    {
        Log(Debug::Warning) << "Creating a record directly failed.";
    }
}

void CSVWorld::TableBottomBox::cloneRequest(const std::string& id, const CSMWorld::UniversalId::Type type)
{
    mCreator->reset();
    mCreator->cloneMode(id, type);
    mLayout->setCurrentWidget(mCreator);
    mCreator->toggleWidgets(false);
    setVisible(true);
    mEditMode = EditMode_Creation;
    mCreator->focus();
}

void CSVWorld::TableBottomBox::touchRequest(const std::vector<CSMWorld::UniversalId>& ids)
{
    mCreator->touch(ids);
}

void CSVWorld::TableBottomBox::extendedDeleteConfigRequest(const std::vector<std::string>& selectedIds)
{
    extendedConfigRequest(ExtendedCommandConfigurator::Mode_Delete, selectedIds);
}

void CSVWorld::TableBottomBox::extendedRevertConfigRequest(const std::vector<std::string>& selectedIds)
{
    extendedConfigRequest(ExtendedCommandConfigurator::Mode_Revert, selectedIds);
}