/*
 * Copyright (c) Contributors to the Open 3D Engine Project.
 * For complete copyright and license terms please see the LICENSE at the root of this distribution.
 *
 * SPDX-License-Identifier: Apache-2.0 OR MIT
 *
 */

#include <QGraphicsLinearLayout>
#include <QGraphicsPixmapItem>
#include <QGraphicsProxyWidget>
#include <QGraphicsSceneDragDropEvent>
#include <QGraphicsView>
#include <QHBoxLayout>
#include <QMimeData>
#include <QPixmap>
#include <QToolButton>

#include <AzQtComponents/Components/Widgets/SpinBox.h>

#include <Components/NodePropertyDisplays/VectorNodePropertyDisplay.h>

#include <GraphCanvas/Components/Slots/Data/DataSlotBus.h>
#include <GraphCanvas/Components/VisualBus.h>
#include <GraphCanvas/Widgets/NodePropertyBus.h>
#include <Widgets/GraphCanvasLabel.h>

namespace GraphCanvas
{
    //////////////////////
    // VectorEventFilter
    //////////////////////

    VectorEventFilter::VectorEventFilter(VectorNodePropertyDisplay* owner)
        : m_owner(owner)
    {
    }

    bool VectorEventFilter::eventFilter(QObject*, QEvent* event)
    {
        switch (event->type())
        {
        case QEvent::FocusIn:
            m_owner->EditStart();
            break;
        case QEvent::FocusOut:
            m_owner->EditFinished();
            break;
        default:
            break;
        }

        return false;
    }

    //////////////////////////
    // ReadOnlyVectorControl
    //////////////////////////
    
    ReadOnlyVectorControl::ReadOnlyVectorControl(int index, const VectorDataInterface& dataInterface)
        : m_index(index)
        , m_dataInterface(dataInterface)
    {
        m_layout = new QGraphicsLinearLayout(Qt::Orientation::Horizontal);
        m_layout->setSpacing(0);
        m_layout->setContentsMargins(0, 0, 0, 0);
        
        m_textLabel = aznew GraphCanvasLabel();
        m_textLabel->SetRoundedCornersMode(GraphCanvasLabel::RoundedCornersMode::LeftCorners);
        m_valueLabel = aznew GraphCanvasLabel();
        m_valueLabel->SetRoundedCornersMode(GraphCanvasLabel::RoundedCornersMode::RightCorners);
        
        m_layout->addItem(m_textLabel);
        m_layout->addItem(m_valueLabel);

        m_textLabel->SetLabel(dataInterface.GetLabel(index));
        
        setContentsMargins(0, 0, 0, 0);
    
        setLayout(m_layout);
    }
    
    ReadOnlyVectorControl::~ReadOnlyVectorControl()
    {
    }
    
    void ReadOnlyVectorControl::RefreshStyle(const AZ::EntityId& sceneId)
    {
        AZStd::string styleName = m_dataInterface.GetElementStyle(m_index);
        m_textLabel->SetSceneStyle(sceneId, NodePropertyDisplay::CreateDisplayLabelStyle(styleName + "_text").c_str());
        m_valueLabel->SetSceneStyle(sceneId, NodePropertyDisplay::CreateDisplayLabelStyle(styleName + "_value").c_str());
    }
    
    void ReadOnlyVectorControl::UpdateDisplay()
    {
        double value = m_dataInterface.GetValue(m_index);

        AZStd::string displayValue = AZStd::string::format("%.*g%s", m_dataInterface.GetDisplayDecimalPlaces(m_index), value, m_dataInterface.GetSuffix(m_index));

        m_valueLabel->SetLabel(displayValue);
    }

    int ReadOnlyVectorControl::GetIndex() const
    {
        return m_index;
    }

    GraphCanvasLabel* ReadOnlyVectorControl::GetTextLabel()
    {
        return m_textLabel;
    }

    const GraphCanvasLabel* ReadOnlyVectorControl::GetTextLabel() const
    {
        return m_textLabel;
    }

    GraphCanvasLabel* ReadOnlyVectorControl::GetValueLabel()
    {
        return m_valueLabel;
    }

    const GraphCanvasLabel* ReadOnlyVectorControl::GetValueLabel() const
    {
        return m_valueLabel;
    }

    IconLayoutItem::IconLayoutItem(QGraphicsItem* parent)
        : QGraphicsWidget(parent)
        , m_pixmap(new QGraphicsPixmapItem(this))
    {
        setGraphicsItem(m_pixmap);
    }

    void IconLayoutItem::setIcon(const QPixmap& pixmap)
    {
        m_pixmap->setPixmap(pixmap);
    }

    IconLayoutItem::~IconLayoutItem()
    {
    }

    //////////////////////////////
    // VectorNodePropertyDisplay
    //////////////////////////////
    VectorNodePropertyDisplay::VectorNodePropertyDisplay(VectorDataInterface* dataInterface)
        : NodePropertyDisplay(dataInterface)
        , m_dataInterface(dataInterface)
        , m_disabledLabel(nullptr)
        , m_propertyVectorCtrl(nullptr)
        , m_button(nullptr)
        , m_proxyWidget(nullptr)
        , m_displayWidget(nullptr)
        , m_iconDisplay(nullptr)
    {
        m_displayWidget = new QGraphicsWidget();
        m_displayWidget->setContentsMargins(0, 0, 0, 0);
        m_displayWidget->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

        QGraphicsLinearLayout* displayLayout = new QGraphicsLinearLayout(Qt::Orientation::Horizontal);
        displayLayout->setSpacing(5);
        displayLayout->setContentsMargins(0, 0, 0, 0);
        displayLayout->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
        
        m_iconDisplay = new IconLayoutItem();
        m_iconDisplay->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);

        displayLayout->addItem(m_iconDisplay);
        displayLayout->setAlignment(m_iconDisplay, Qt::AlignBottom);
 
        int elementCount = dataInterface->GetElementCount();
        m_vectorDisplays.reserve(elementCount);
        for (int i=0; i < elementCount; ++i)
        {
            m_vectorDisplays.push_back(aznew ReadOnlyVectorControl(i, (*dataInterface)));
            displayLayout->addItem(m_vectorDisplays.back());
        }

        m_displayWidget->setLayout(displayLayout);
        
        m_disabledLabel = aznew GraphCanvasLabel();
    }

    VectorNodePropertyDisplay::~VectorNodePropertyDisplay()
    {
        delete m_dataInterface;
        m_dataInterface = nullptr;
    
        delete m_disabledLabel;
        delete m_displayWidget;
        CleanupProxyWidget();
    }
    
    void VectorNodePropertyDisplay::RefreshStyle()
    {
        AZ::EntityId sceneId = GetSceneId();

        AZStd::string elementStyle = m_dataInterface->GetStyle();

        m_styleHelper.SetScene(sceneId);
        m_styleHelper.SetStyle(NodePropertyDisplay::CreateDisplayLabelStyle(elementStyle).c_str());
        m_disabledLabel->SetSceneStyle(GetSceneId(), NodePropertyDisplay::CreateDisabledLabelStyle(elementStyle).c_str());

        QColor backgroundColor = m_styleHelper.GetAttribute(GraphCanvas::Styling::Attribute::BackgroundColor, QColor(0, 0, 0, 0));

        m_displayWidget->setAutoFillBackground(true);

        QPalette palette = m_displayWidget->palette();
        palette.setColor(QPalette::ColorRole::Window, backgroundColor);
        m_displayWidget->setPalette(palette);

        qreal spacing = static_cast<QGraphicsLinearLayout*>(m_displayWidget->layout())->spacing();

        // Start off with - spacing to make the iteration logic cleaner.
        qreal elementWidth = -spacing;
        qreal elementHeight = m_styleHelper.GetAttribute(GraphCanvas::Styling::Attribute::Height, 0);

        const qreal k_sizingConstraint = 200;
        
        for (auto control : m_vectorDisplays)
        {
            control->RefreshStyle(sceneId);

            QSizeF maximumSize = control->maximumSize();

            // Maximum size might be stupidly large, which will cause an error
            // from Qt as it tries to overly allocate space for something.
            //
            // As such we want to put an upper limit on this that is large but not unreasonable.
            // Can't really do this at the element level since it messes with the styling
            // when I set it. So instead we'll do it here.
            elementWidth += AZ::GetMin(maximumSize.width(), k_sizingConstraint) + spacing;
            elementHeight = AZStd::GetMax(elementHeight, AZ::GetMin(k_sizingConstraint, maximumSize.height()));
        }
        elementWidth += m_iconDisplay->preferredWidth();

        m_displayWidget->setMinimumSize(elementWidth, elementHeight);
        m_displayWidget->setPreferredSize(elementWidth, elementHeight);
        m_displayWidget->setMaximumSize(elementWidth, elementHeight);
        m_displayWidget->adjustSize();

        if (m_propertyVectorCtrl)
        {
            m_propertyVectorCtrl->setMinimumSize(aznumeric_cast<int>(elementWidth), aznumeric_cast<int>(elementHeight));
            m_propertyVectorCtrl->setMaximumSize(aznumeric_cast<int>(elementWidth), aznumeric_cast<int>(elementHeight));
            m_propertyVectorCtrl->adjustSize();
        }
    }

    void VectorNodePropertyDisplay::UpdateDisplay()
    {
        for (auto control : m_vectorDisplays)
        {
            control->UpdateDisplay();
        }

        const auto buttonIcon = m_dataInterface->GetIcon();
        if (m_iconDisplay)
        {
            if (!buttonIcon.isNull())
            {
                m_iconDisplay->setPreferredSize(buttonIcon.size());
                m_iconDisplay->setIcon(buttonIcon);
            }
            m_iconDisplay->setVisible(!buttonIcon.isNull());
        }

        if (m_button)
        {
            if (!buttonIcon.isNull())
            {
                QIcon newIcon(buttonIcon);
                m_button->setFixedSize(buttonIcon.size());
                m_button->setIconSize(buttonIcon.size());
                m_button->setIcon(newIcon);
            }
            m_button->setVisible(!buttonIcon.isNull());
        }

        if (m_propertyVectorCtrl)
        {
            for (int i = 0; i < m_vectorDisplays.size(); ++i)
            {
                m_propertyVectorCtrl->setValuebyIndex(m_dataInterface->GetValue(i), i);
            }

            m_proxyWidget->update();
        }
    }

    QGraphicsLayoutItem* VectorNodePropertyDisplay::GetDisabledGraphicsLayoutItem()
    {
        CleanupProxyWidget();
        return m_disabledLabel;
    }
    
    QGraphicsLayoutItem* VectorNodePropertyDisplay::GetDisplayGraphicsLayoutItem()
    {
        CleanupProxyWidget();
        return m_displayWidget;
    }
    
    QGraphicsLayoutItem* VectorNodePropertyDisplay::GetEditableGraphicsLayoutItem()
    {
        SetupProxyWidget();
        return m_proxyWidget;
    }

    void VectorNodePropertyDisplay::OnDragDropStateStateChanged(const DragDropState& dragState)
    {
        for (ReadOnlyVectorControl* vectorControl : m_vectorDisplays)
        {
            {
                Styling::StyleHelper& styleHelper = vectorControl->GetTextLabel()->GetStyleHelper();
                UpdateStyleForDragDrop(dragState, styleHelper);
                vectorControl->GetTextLabel()->update();
            }

            {
                Styling::StyleHelper& styleHelper = vectorControl->GetValueLabel()->GetStyleHelper();
                UpdateStyleForDragDrop(dragState, styleHelper);
                vectorControl->GetValueLabel()->update();
            }
        }
    }
    
    void VectorNodePropertyDisplay::EditStart()
    {
        NodePropertiesRequestBus::Event(GetNodeId(), &NodePropertiesRequests::LockEditState, this);
        TryAndSelectNode();
    }
    
    void VectorNodePropertyDisplay::SubmitValue()
    {
        AzQtComponents::VectorElement** elements = m_propertyVectorCtrl->getElements();
        const int elementCount = m_propertyVectorCtrl->getSize();
        for (int i = 0; i < elementCount; ++i)
        {
            const AzQtComponents::VectorElement* element = elements[i];
            m_dataInterface->SetValue(i, element->getValue());
        }
        UpdateDisplay();
    }

    void VectorNodePropertyDisplay::EditFinished()
    {
        SubmitValue();
        NodePropertiesRequestBus::Event(GetNodeId(), &NodePropertiesRequests::UnlockEditState, this);
    }

    void VectorNodePropertyDisplay::SetupProxyWidget()
    {
        if (!m_propertyVectorCtrl)
        {
            m_proxyWidget = new QGraphicsProxyWidget();

            m_widgetContainer = new QWidget();
            QHBoxLayout* layout = new QHBoxLayout(m_widgetContainer);
            m_widgetContainer->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Fixed);

            layout->setAlignment(Qt::AlignLeft);
            layout->setContentsMargins(0, 0, 0, 0);

            m_button = new QToolButton(m_widgetContainer);
            m_button->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
            m_button->setVisible(false);
            QObject::connect(m_button, &QToolButton::clicked, [this] () {
                NodePropertiesRequestBus::Event(GetNodeId(), &NodePropertiesRequests::LockEditState, this);
                m_dataInterface->OnPressButton();
                UpdateDisplay();
                NodePropertiesRequestBus::Event(GetNodeId(), &NodePropertiesRequests::UnlockEditState, this);
            });
            layout->addWidget(m_button);

            m_proxyWidget->setFlag(QGraphicsItem::ItemIsFocusable, true);
            m_proxyWidget->setFocusPolicy(Qt::StrongFocus);
            m_proxyWidget->setAcceptDrops(false);

            const int elementCount = m_dataInterface->GetElementCount();
            m_propertyVectorCtrl = new AzQtComponents::VectorInput(m_widgetContainer, elementCount);

            for (int i = 0; i < elementCount; ++i)
            {
                m_propertyVectorCtrl->setLabel(i, m_dataInterface->GetLabel(i));
                m_propertyVectorCtrl->setMinimum(m_dataInterface->GetMinimum(i));
                m_propertyVectorCtrl->setMaximum(m_dataInterface->GetMaximum(i));
                m_propertyVectorCtrl->setDecimals(m_dataInterface->GetDecimalPlaces(i));
                m_propertyVectorCtrl->setDisplayDecimals(m_dataInterface->GetDisplayDecimalPlaces(i));
                m_propertyVectorCtrl->setSuffix(m_dataInterface->GetSuffix(i));
            }

            m_propertyVectorCtrl->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
            QObject::connect(m_propertyVectorCtrl, &AzQtComponents::VectorInput::editingFinished, [this]() { SubmitValue(); });

            layout->addWidget(m_propertyVectorCtrl);
            m_widgetContainer->setProperty("HasNoWindowDecorations", true);
            m_proxyWidget->setWidget(m_widgetContainer);
            
            UpdateDisplay();
            RefreshStyle();
            RegisterShortcutDispatcher(m_propertyVectorCtrl);
        }
    }

    void VectorNodePropertyDisplay::CleanupProxyWidget()
    {
        if (m_propertyVectorCtrl)
        {
            UnregisterShortcutDispatcher(m_propertyVectorCtrl);
            delete m_widgetContainer; // NB: this implicitly deletes m_proxy widget
            m_widgetContainer = nullptr;
            m_propertyVectorCtrl = nullptr;
            m_button= nullptr;
            m_proxyWidget = nullptr;
        }
    }

#include <Source/Components/NodePropertyDisplays/moc_VectorNodePropertyDisplay.cpp>
}