// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

#include "pch.h"
#include "GraphingCalculator.xaml.h"
#include "CalcViewModel/Common/AppResourceProvider.h"
#include "CalcViewModel/Common/TraceLogger.h"
#include "CalcViewModel/Common/LocalizationSettings.h"
#include "CalcViewModel/Common/LocalizationStringUtil.h"
#include "Common/KeyboardShortcutManager.h"
#include "CalcViewModel/Common/Automation/NarratorAnnouncement.h"
#include "CalcViewModel/Common/Automation/NarratorNotifier.h"
#include "Controls/CalculationResult.h"
#include "CalcManager/NumberFormattingUtils.h"
#include "Calculator/Controls/EquationTextBox.h"
#include "Calculator/Views/GraphingCalculator/EquationInputArea.xaml.h"
#include "CalcViewModel/Common/Utils.h"
#include "GraphingSettings.xaml.h"

using namespace CalculatorApp;
using namespace CalculatorApp::Common;
using namespace CalculatorApp::Common::Automation;
using namespace CalculatorApp::Controls;
using namespace CalculatorApp::ViewModel;
using namespace CalcManager::NumberFormattingUtils;
using namespace concurrency;
using namespace GraphControl;
using namespace Platform;
using namespace Platform::Collections;
using namespace std;
using namespace std::chrono;
using namespace Utils;
using namespace Windows::ApplicationModel::DataTransfer;
using namespace Windows::ApplicationModel::Resources;
using namespace Windows::Foundation;
using namespace Windows::Foundation::Collections;
using namespace Windows::Storage;
using namespace Windows::Storage::Streams;
using namespace Windows::System;
using namespace Windows::UI::Core;
using namespace Windows::UI::Input;
using namespace Windows::UI::ViewManagement;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Automation;
using namespace Windows::UI::Xaml::Automation::Peers;
using namespace Windows::UI::Xaml::Data;
using namespace Windows::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Controls::Primitives;
using namespace Windows::UI::Xaml::Input;
using namespace Windows::UI::Xaml::Media;
using namespace Windows::UI::Xaml::Media::Imaging;
using namespace Windows::UI::Popups;
using namespace Windows::UI::ViewManagement;

constexpr auto sc_ViewModelPropertyName = L"ViewModel";
constexpr auto sc_IsGraphThemeMatchApp = L"IsGraphThemeMatchApp";

DEPENDENCY_PROPERTY_INITIALIZATION(GraphingCalculator, IsSmallState);
DEPENDENCY_PROPERTY_INITIALIZATION(GraphingCalculator, GraphControlAutomationName);

GraphingCalculator::GraphingCalculator()
    : m_accessibilitySettings{ ref new AccessibilitySettings() }
{
    InitializeComponent();

    DataTransferManager ^ dataTransferManager = DataTransferManager::GetForCurrentView();

    // Register the current control as a share source.
    m_dataRequestedToken = dataTransferManager->DataRequested +=
        ref new TypedEventHandler<DataTransferManager ^, DataRequestedEventArgs ^>(this, &GraphingCalculator::OnDataRequested);

    // Request notifications when we should be showing the trace values
    GraphingControl->TracingChangedEvent += ref new TracingChangedEventHandler(this, &GraphingCalculator::OnShowTracePopupChanged);

    // And when the actual trace value changes
    GraphingControl->TracingValueChangedEvent += ref new TracingValueChangedEventHandler(this, &GraphingCalculator::OnTracePointChanged);

    // Update where the pointer value is (ie: where the user cursor from keyboard inputs moves the point to)
    GraphingControl->PointerValueChangedEvent += ref new PointerValueChangedEventHandler(this, &GraphingCalculator::OnPointerPointChanged);

    GraphingControl->UseCommaDecimalSeperator = LocalizationSettings::GetInstance().GetDecimalSeparator() == ',';

    // OemMinus and OemAdd aren't declared in the VirtualKey enum, we can't add this accelerator XAML-side
    auto virtualKey = ref new KeyboardAccelerator();
    virtualKey->Key = (VirtualKey)189; // OemPlus key
    virtualKey->Modifiers = VirtualKeyModifiers::Control;
    ZoomOutButton->KeyboardAccelerators->Append(virtualKey);

    virtualKey = ref new KeyboardAccelerator();
    virtualKey->Key = (VirtualKey)187; // OemAdd key
    virtualKey->Modifiers = VirtualKeyModifiers::Control;
    ZoomInButton->KeyboardAccelerators->Append(virtualKey);

    if (Windows::Foundation::Metadata::ApiInformation::IsTypePresent(L"Windows.UI.Xaml.Media.ThemeShadow"))
    {
        SharedShadow->Receivers->Append(GraphingControl);
    }
    
    m_accessibilitySettings->HighContrastChanged +=
        ref new TypedEventHandler<AccessibilitySettings ^, Object ^>(this, &GraphingCalculator::OnHighContrastChanged);

    m_uiSettings = ref new UISettings();
    m_uiSettings->ColorValuesChanged += ref new TypedEventHandler<UISettings ^, Object ^>(this, &GraphingCalculator::OnColorValuesChanged);

    ApplicationDataContainer ^ localSettings = ApplicationData::Current->LocalSettings;

    if (localSettings != nullptr && localSettings->Values->HasKey(StringReference(sc_IsGraphThemeMatchApp)))
    {
        auto isMatchAppLocalSetting = static_cast<bool>(localSettings->Values->Lookup(StringReference(sc_IsGraphThemeMatchApp)));
        if (isMatchAppLocalSetting)
        {
            IsMatchAppTheme = true;
            TraceLogger::GetInstance()->LogGraphTheme(L"IsMatchAppTheme");
        }
    }
    else
    {
        IsMatchAppTheme = false;
        TraceLogger::GetInstance()->LogGraphTheme(L"IsAlwaysLightTheme");
    }

    UpdateGraphTheme();
}

void GraphingCalculator::OnShowTracePopupChanged(bool newValue)
{
    if ((TraceValuePopup->Visibility == ::Visibility::Visible) != newValue)
    {
        TraceValuePopup->Visibility = newValue ? ::Visibility::Visible : ::Visibility::Collapsed;
    }
}
void GraphingCalculator::GraphingCalculator_DataContextChanged(FrameworkElement ^ sender, DataContextChangedEventArgs ^ args)
{
    if (ViewModel != nullptr)
    {
        if (m_vectorChangedToken.Value != 0)
        {
            ViewModel->Equations->VectorChanged -= m_vectorChangedToken;
            m_vectorChangedToken.Value = 0;
        }

        if (m_variableUpdatedToken.Value != 0)
        {
            ViewModel->VariableUpdated -= m_variableUpdatedToken;
            m_variableUpdatedToken.Value = 0;
        }
    }

    ViewModel = dynamic_cast<GraphingCalculatorViewModel ^>(args->NewValue);

    m_vectorChangedToken = ViewModel->Equations->VectorChanged +=
        ref new VectorChangedEventHandler<EquationViewModel ^>(this, &GraphingCalculator::OnEquationsVectorChanged);

    m_variableUpdatedToken = ViewModel->VariableUpdated +=
        ref new EventHandler<VariableChangedEventArgs>(this, &CalculatorApp::GraphingCalculator::OnVariableChanged);

    UpdateGraphAutomationName();
}

void GraphingCalculator::OnEquationsVectorChanged(IObservableVector<EquationViewModel ^> ^ sender, IVectorChangedEventArgs ^ event)
{
    // If an item is already added to the graph, changing it should automatically trigger a graph update
    if (event->CollectionChange == ::CollectionChange::ItemChanged)
    {
        return;
    }

    // Do not plot the graph if we are removing an empty equation, just remove it
    if (event->CollectionChange == ::CollectionChange::ItemRemoved)
    {
        auto itemToRemove = GraphingControl->Equations->GetAt(event->Index);

        if (itemToRemove->Expression->IsEmpty())
        {
            GraphingControl->Equations->RemoveAt(event->Index);

            if (GraphingControl->Equations->Size == 1 && GraphingControl->Equations->GetAt(0)->Expression->IsEmpty())
            {
                IsManualAdjustment = false;
            }

            return;
        }
    }

    // Do not plot the graph if we are adding an empty equation, just add it
    if (event->CollectionChange == ::CollectionChange::ItemInserted)
    {
        auto itemToAdd = sender->GetAt(event->Index);

        if (itemToAdd->Expression->IsEmpty())
        {
            GraphingControl->Equations->Append(itemToAdd->GraphEquation);

            return;
        }
    }

    // We are either adding or removing a valid equation, or resetting the collection. We will need to plot the graph
    GraphingControl->Equations->Clear();

    for (auto equationViewModel : ViewModel->Equations)
    {
        GraphingControl->Equations->Append(equationViewModel->GraphEquation);
    }

    GraphingControl->PlotGraph(false);
}

wstringstream GraphingCalculator::FormatTraceValue(double min, double max, float pointValue)
{
    wstringstream traceValueString;

    // Extract precision we will round to 
    auto precision = static_cast<int>(floor(log10(max - min)) - 3);

    // Determine if we want to show scientific notation instead
    if (precision <= -7 || precision  >= 7)
    {
        traceValueString << scientific;
    }
    else
    {
        traceValueString << fixed;
    }

    // If we are rounding to a decimal place, set the precision
    if (precision < 0)
    {
        traceValueString << setprecision(::min(7, abs(precision))) << pointValue;
    }
    else
    {
        traceValueString << setprecision(0) << pointValue;
    }

    return traceValueString;
}

void GraphingCalculator::OnTracePointChanged(Point newPoint)
{
    wstringstream traceValueString;

    double xAxisMin, xAxisMax, yAxisMin, yAxisMax;
    GraphingControl->GetDisplayRanges(&xAxisMin, &xAxisMax, &yAxisMin, &yAxisMax);

    traceValueString << "(" << FormatTraceValue(xAxisMin, xAxisMax, newPoint.X).str() << ", " << FormatTraceValue(yAxisMin, yAxisMax, newPoint.Y).str() << ")";

    TraceValue->Text = ref new String(traceValueString.str().c_str());

    auto peer = FrameworkElementAutomationPeer::FromElement(TraceValue);

    if (peer != nullptr)
    {
        peer->RaiseAutomationEvent(AutomationEvents::LiveRegionChanged);
    }

    PositionGraphPopup();
}

void CalculatorApp::GraphingCalculator::OnPointerPointChanged(Windows::Foundation::Point newPoint)
{
    if (TracePointer != nullptr)
    {
        // Move the pointer glyph to where it is supposed to be.
        Canvas::SetLeft(TracePointer, newPoint.X);
        Canvas::SetTop(TracePointer, newPoint.Y);
    }
}

GraphingCalculatorViewModel ^ GraphingCalculator::ViewModel::get()
{
    return m_viewModel;
}

void GraphingCalculator::ViewModel::set(GraphingCalculatorViewModel ^ vm)
{
    if (m_viewModel != vm)
    {
        m_viewModel = vm;
        RaisePropertyChanged(StringReference(sc_ViewModelPropertyName));
    }
}

void CalculatorApp::GraphingCalculator::OnShareClick(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e)
{
    // Ask the OS to start a share action.
    DataTransferManager::ShowShareUI();
    TraceLogger::GetInstance()->LogGraphButtonClicked(GraphButton::Share, GraphButtonValue::None);
}

// When share is invoked (by the user or programmatically) the event handler we registered will be called to populate the data package with the
// data to be shared. We will request the current graph image from the grapher as a stream that will pass to the share request.
void GraphingCalculator::OnDataRequested(DataTransferManager ^ sender, DataRequestedEventArgs ^ args)
{
    auto resourceLoader = ResourceLoader::GetForCurrentView();

    try
    {
        std::wstringstream rawHtml;
        std::wstringstream equationHtml;

        rawHtml << L"<p><img src='graph.png' width='600' alt='" << resourceLoader->GetString(L"GraphImageAltText")->Data() << "'></p>";

        auto equations = ViewModel->Equations;
        bool hasEquations = false;

        if (equations->Size > 0)
        {
            equationHtml << L"<span style=\"color: rgb(68, 114, 196); font-style: bold; font-size : 13pt;\">";
            equationHtml << resourceLoader->GetString(L"EquationsShareHeader")->Data();
            equationHtml << L"</span>";
            equationHtml << L"<table cellpadding=\"0\" cellspacing=\"0\" >";

            for (auto equation : equations)
            {
                auto expression = equation->Expression;
                if (expression->IsEmpty())
                {
                    continue;
                }

                auto color = equation->LineColor;
                hasEquations = true;

                expression = GraphingControl->ConvertToLinear(expression);

                std::wstringstream equationColorHtml;
                equationColorHtml << L"color:rgb(" << color.R.ToString()->Data() << L"," << color.G.ToString()->Data() << L"," << color.B.ToString()->Data()
                                  << L");";

                equationHtml << L"<tr style=\"margin: 0pt 0pt 0pt 0pt; padding: 0pt 0pt 0pt 0pt; \"><td><span style=\"font-size: 22pt; line-height: 0;"
                             << equationColorHtml.str() << L"\">&#x25A0;</span></td><td><div style=\"margin: 4pt 0pt 0pt 6pt;\">";
                equationHtml << EscapeHtmlSpecialCharacters(expression)->Data();
                equationHtml << L"</div></td>";
            }
            equationHtml << L"</table>";
        }

        if (hasEquations)
        {
            rawHtml << equationHtml.str();
        }

        auto variables = ViewModel->Variables;

        if (variables->Size > 0)
        {
            auto localizedSeperator = LocalizationSettings::GetInstance().GetListSeparator() + L" ";

            rawHtml << L"<br><span style=\"color: rgb(68, 114, 196); font-style: bold; font-size: 13pt;\">";
            rawHtml << resourceLoader->GetString(L"VariablesShareHeader")->Data();
            rawHtml << L"</span><br><div style=\"margin: 4pt 0pt 0pt 0pt;\">";

            for (unsigned i = 0; i < variables->Size; i++)
            {
                auto name = variables->GetAt(i)->Name;
                auto value = variables->GetAt(i)->Value;

                rawHtml << name->Data();
                rawHtml << L"=";
                auto formattedValue = to_wstring(value);
                TrimTrailingZeros(formattedValue);
                rawHtml << formattedValue;

                if (variables->Size - 1 != i)
                {
                    rawHtml << localizedSeperator;
                }
            }

            rawHtml << L"</div>";
        }

        rawHtml << L"<br><br>";

        // Shortcut to the request data
        auto requestData = args->Request->Data;

        DataPackage ^ dataPackage = ref new DataPackage();
        auto html = HtmlFormatHelper::CreateHtmlFormat(ref new String(rawHtml.str().c_str()));

        requestData->Properties->Title = resourceLoader->GetString(L"ShareActionTitle");

        requestData->SetHtmlFormat(html);

        auto bitmapStream = GraphingControl->GetGraphBitmapStream();

        requestData->ResourceMap->Insert(ref new String(L"graph.png"), bitmapStream);
        requestData->SetBitmap(bitmapStream);

        // Set the thumbnail image (in case the share target can't handle HTML)
        requestData->Properties->Thumbnail = bitmapStream;
    }
    catch (Exception ^ ex)
    {
        TraceLogger::GetInstance()->LogPlatformException(ViewMode::Graphing, __FUNCTIONW__, ex);

        // Something went wrong, notify the user.

        auto errDialog = ref new ContentDialog();
        errDialog->Content = resourceLoader->GetString(L"ShareActionErrorMessage");
        errDialog->CloseButtonText = resourceLoader->GetString(L"ShareActionErrorOk");
        errDialog->ShowAsync();
    }
}

void GraphingCalculator::GraphingControl_VariablesUpdated(Object ^, Object ^)
{
    m_viewModel->UpdateVariables(GraphingControl->Variables);
}

void GraphingCalculator::OnVariableChanged(Platform::Object ^ sender, VariableChangedEventArgs args)
{
    GraphingControl->SetVariable(args.variableName, args.newValue);
}

void GraphingCalculator::OnZoomInCommand(Object ^ /* parameter */)
{
    GraphingControl->ZoomFromCenter(zoomInScale);
    TraceLogger::GetInstance()->LogGraphButtonClicked(GraphButton::ZoomIn, GraphButtonValue::None);
}

void GraphingCalculator::OnZoomOutCommand(Object ^ /* parameter */)
{
    GraphingControl->ZoomFromCenter(zoomOutScale);
    TraceLogger::GetInstance()->LogGraphButtonClicked(GraphButton::ZoomOut, GraphButtonValue::None);
}

String ^ GraphingCalculator::GetTracingLegend(Platform::IBox<bool> ^ isTracing)
{
    auto resProvider = AppResourceProvider::GetInstance();
    return isTracing != nullptr && isTracing->Value ? resProvider->GetResourceString(L"disableTracingButtonToolTip")
                                                    : resProvider->GetResourceString(L"enableTracingButtonToolTip");
}

void GraphingCalculator::GraphingControl_LostFocus(Object ^ sender, RoutedEventArgs ^ e)
{
    // If the graph is losing focus while we are in active tracing we need to turn it off so we don't try to eat keys in other controls.
    if (GraphingControl->ActiveTracing)
    {
        if (ActiveTracing->Equals(FocusManager::GetFocusedElement()) && ActiveTracing->IsPressed)
        {
            m_ActiveTracingPointerCaptureLost = ActiveTracing->PointerCaptureLost +=
                ref new Windows::UI::Xaml::Input::PointerEventHandler(this, &CalculatorApp::GraphingCalculator::ActiveTracing_PointerCaptureLost);
        }
        else
        {
            GraphingControl->ActiveTracing = false;
            OnShowTracePopupChanged(false);
        }
    }
}

void CalculatorApp::GraphingCalculator::ActiveTracing_PointerCaptureLost(Platform::Object ^ sender, Windows::UI::Xaml::Input::PointerRoutedEventArgs ^ e)
{
    if (m_ActiveTracingPointerCaptureLost.Value != 0)
    {
        ActiveTracing->PointerCaptureLost -= m_ActiveTracingPointerCaptureLost;
        m_ActiveTracingPointerCaptureLost.Value = 0;
    }

    if (GraphingControl->ActiveTracing)
    {
        GraphingControl->ActiveTracing = false;
        OnShowTracePopupChanged(false);
    }
}

void GraphingCalculator::GraphingControl_LosingFocus(UIElement ^ sender, LosingFocusEventArgs ^ args)
{
    auto newFocusElement = dynamic_cast<FrameworkElement ^>(args->NewFocusedElement);
    if (newFocusElement == nullptr || newFocusElement->Name == nullptr)
    {
        // Because clicking on the swap chain panel will try to move focus to a control that can't actually take focus
        // we will get a null destination.  So we are going to try and cancel that request.
        // If the destination is not in our application we will also get a null destination but the cancel will fail so it doesn't hurt to try.
        args->TryCancel();
    }
}

void GraphingCalculator::OnEquationKeyGraphFeaturesRequested(Object ^ sender, EquationViewModel ^ equationViewModel)
{
    ViewModel->SetSelectedEquation(equationViewModel);
    if (equationViewModel != nullptr)
    {
        auto keyGraphFeatureInfo = GraphingControl->AnalyzeEquation(equationViewModel->GraphEquation);
        equationViewModel->PopulateKeyGraphFeatures(keyGraphFeatureInfo);
        IsKeyGraphFeaturesVisible = true;
        equationViewModel->GraphEquation->IsSelected = true;
    }
}

void GraphingCalculator::OnKeyGraphFeaturesClosed(Object ^ sender, RoutedEventArgs ^ e)
{
    IsKeyGraphFeaturesVisible = false;
    EquationInputAreaControl->FocusEquationTextBox(ViewModel->SelectedEquation);
}

Visibility GraphingCalculator::ShouldDisplayPanel(bool isSmallState, bool isEquationModeActivated, bool isGraphPanel)
{
    return (!isSmallState || isEquationModeActivated ^ isGraphPanel) ? ::Visibility::Visible : ::Visibility::Collapsed;
}

Platform::String ^ GraphingCalculator::GetInfoForSwitchModeToggleButton(bool isChecked)
{
    if (isChecked)
    {
        return AppResourceProvider::GetInstance()->GetResourceString(L"GraphSwitchToGraphMode");
    }
    else
    {
        return AppResourceProvider::GetInstance()->GetResourceString(L"GraphSwitchToEquationMode");
    }
}

void GraphingCalculator::SwitchModeToggleButton_Toggled(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e)
{
    auto narratorNotifier = ref new NarratorNotifier();
    String ^ announcementText;
    if (SwitchModeToggleButton->IsOn)
    {
        announcementText = AppResourceProvider::GetInstance()->GetResourceString(L"GraphSwitchedToEquationModeAnnouncement");
    }
    else
    {
        announcementText = AppResourceProvider::GetInstance()->GetResourceString(L"GraphSwitchedToGraphModeAnnouncement");
    }

    auto announcement = CalculatorAnnouncement::GetGraphModeChangedAnnouncement(announcementText);
    narratorNotifier->Announce(announcement);
}

void GraphingCalculator::PositionGraphPopup()
{
    if (GraphingControl->TraceLocation.X + 15 + TraceValuePopup->ActualWidth >= GraphingControl->ActualWidth)
    {
        TraceValuePopupTransform->X = (int)GraphingControl->TraceLocation.X - 15 - TraceValuePopup->ActualWidth;
    }
    else
    {
        TraceValuePopupTransform->X = (int)GraphingControl->TraceLocation.X + 15;
    }

    if (GraphingControl->TraceLocation.Y >= 30)
    {
        TraceValuePopupTransform->Y = (int)GraphingControl->TraceLocation.Y - 30;
    }
    else
    {
        TraceValuePopupTransform->Y = (int)GraphingControl->TraceLocation.Y;
    }
}

void GraphingCalculator::TraceValuePopup_SizeChanged(Object ^ sender, SizeChangedEventArgs ^ e)
{
    PositionGraphPopup();
}

::Visibility GraphingCalculator::ManageEditVariablesButtonVisibility(unsigned int numberOfVariables)
{
    return numberOfVariables == 0 ? ::Visibility::Collapsed : ::Visibility::Visible;
}

void CalculatorApp::GraphingCalculator::ActiveTracing_Checked(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e)
{
    if (!m_cursorShadowInitialized)
    {
        this->FindName(L"TraceCanvas");

        // add shadow to the trace pointer
        AddTracePointerShadow();

        // hide the shadow in high contrast mode
        CursorShadow->Visibility = m_accessibilitySettings->HighContrast ? ::Visibility::Collapsed : ::Visibility::Visible;

        Canvas::SetLeft(TracePointer, TraceCanvas->ActualWidth / 2 + 40);
        Canvas::SetTop(TracePointer, TraceCanvas->ActualHeight / 2 - 40);

        m_cursorShadowInitialized = true;
    }

    FocusManager::TryFocusAsync(GraphingControl, ::FocusState::Programmatic);

    m_activeTracingKeyUpToken = Window::Current->CoreWindow->KeyUp +=
        ref new TypedEventHandler<Windows::UI::Core::CoreWindow ^, Windows::UI::Core::KeyEventArgs ^>(
            this, &CalculatorApp::GraphingCalculator::ActiveTracing_KeyUp);

    KeyboardShortcutManager::IgnoreEscape(false);

    TracePointer->Visibility = ::Visibility::Visible;
    TraceLogger::GetInstance()->LogGraphButtonClicked(GraphButton::ActiveTracingChecked, GraphButtonValue::None);
}

void CalculatorApp::GraphingCalculator::ActiveTracing_Unchecked(Platform::Object ^ sender, Windows::UI::Xaml::RoutedEventArgs ^ e)
{
    if (m_ActiveTracingPointerCaptureLost.Value != 0)
    {
        ActiveTracing->PointerCaptureLost -= m_ActiveTracingPointerCaptureLost;
        m_ActiveTracingPointerCaptureLost.Value = 0;
    }

    if (m_activeTracingKeyUpToken.Value != 0)
    {
        Window::Current->CoreWindow->KeyUp -= m_activeTracingKeyUpToken;
        m_activeTracingKeyUpToken.Value = 0;
    }
    KeyboardShortcutManager::HonorEscape();

    TracePointer->Visibility = ::Visibility::Collapsed;
    TraceLogger::GetInstance()->LogGraphButtonClicked(GraphButton::ActiveTracingUnchecked, GraphButtonValue::None);
}

void CalculatorApp::GraphingCalculator::ActiveTracing_KeyUp(Windows::UI::Core::CoreWindow ^ sender, Windows::UI::Core::KeyEventArgs ^ args)
{
    if (args->VirtualKey == VirtualKey::Escape)
    {
        GraphingControl->ActiveTracing = false;
        args->Handled = true;
    }
}

void GraphingCalculator::GraphSettingsButton_Click(Object ^ sender, RoutedEventArgs ^ e)
{
    DisplayGraphSettings();
    TraceLogger::GetInstance()->LogGraphButtonClicked(GraphButton::GraphSettings, GraphButtonValue::None);
}

void GraphingCalculator::DisplayGraphSettings()
{
    if (m_graphSettings == nullptr)
    {
        m_graphSettings = ref new GraphingSettings();
        m_graphSettings->GraphThemeSettingChanged += ref new EventHandler<bool>(this, &GraphingCalculator::OnGraphThemeSettingChanged);
    }

    m_graphSettings->IsMatchAppTheme = IsMatchAppTheme;
    m_graphSettings->SetGrapher(this->GraphingControl);
    auto flyoutGraphSettings = ref new Flyout();
    flyoutGraphSettings->Content = m_graphSettings;
    flyoutGraphSettings->Closing += ref new TypedEventHandler<FlyoutBase ^, FlyoutBaseClosingEventArgs ^>(this, &GraphingCalculator::OnSettingsFlyout_Closing);

    auto options = ref new FlyoutShowOptions();
    options->Placement = FlyoutPlacementMode::BottomEdgeAlignedRight;
    flyoutGraphSettings->ShowAt(GraphSettingsButton, options);
}

void CalculatorApp::GraphingCalculator::AddTracePointerShadow()
{
    auto compositor = ::Hosting::ElementCompositionPreview::GetElementVisual(CursorPath)->Compositor;
    auto dropShadow = compositor->CreateDropShadow();
    dropShadow->BlurRadius = 6;
    dropShadow->Opacity = 0.33f;
    dropShadow->Offset = ::Numerics::float3(2, 2, 0);
    dropShadow->Mask = CursorPath->GetAlphaMask();

    auto shadowSpriteVisual = compositor->CreateSpriteVisual();
    shadowSpriteVisual->Size = ::Numerics::float2(18, 18);
    shadowSpriteVisual->Shadow = dropShadow;
    ::Hosting::ElementCompositionPreview::SetElementChildVisual(CursorShadow, shadowSpriteVisual);
}

void GraphingCalculator::OnSettingsFlyout_Closing(FlyoutBase ^ sender, FlyoutBaseClosingEventArgs ^ args)
{
    auto flyout = static_cast<Flyout ^>(sender);
    auto graphingSetting = static_cast<GraphingSettings ^>(flyout->Content);
}

void GraphingCalculator::Canvas_SizeChanged(Object ^ /*sender*/, SizeChangedEventArgs ^ e)
{
    // Initialize the pointer to the correct location to match initial value in GraphControl\DirectX\RenderMain.cpp
    if (TracePointer != nullptr)
    {
        Canvas::SetLeft(TracePointer, e->NewSize.Width / 2 + 40);
        Canvas::SetTop(TracePointer, e->NewSize.Height / 2 - 40);
    }
}

void GraphingCalculator::OnHighContrastChanged(AccessibilitySettings ^ sender, Object ^ /*args*/)
{
    if (CursorShadow != nullptr)
    {
        CursorShadow->Visibility = sender->HighContrast ? ::Visibility::Collapsed : ::Visibility::Visible;
    }

    UpdateGraphTheme();
}

void GraphingCalculator::OnEquationFormatRequested(Object ^ sender, MathRichEditBoxFormatRequest ^ e)
{
    if (!e->OriginalText->IsEmpty())
    {
        e->FormattedText = GraphingControl->FormatMathML(e->OriginalText);
    }
}

void GraphingCalculator::SetDefaultFocus()
{
    if (IsSmallState)
    {
        SwitchModeToggleButton->Focus(::FocusState::Programmatic);
    }
    else
    {
        EquationInputAreaControl->Focus(::FocusState::Programmatic);
    }
}

void GraphingCalculator::GraphingControl_GraphViewChangedEvent(Object ^ sender, GraphViewChangedReason reason)
{
    if (reason == GraphViewChangedReason::Manipulation)
    {
        IsManualAdjustment = true;
    }
    else
    {
        IsManualAdjustment = false;
    }

    UpdateGraphAutomationName();

    auto announcement = CalculatorAnnouncement::GetGraphViewChangedAnnouncement(GraphControlAutomationName);
    auto peer = FrameworkElementAutomationPeer::FromElement(GraphingControl);
    if (peer != nullptr)
    {
        peer->RaiseNotificationEvent(announcement->Kind, announcement->Processing, announcement->Announcement, announcement->ActivityId);
    }
}

void GraphingCalculator::GraphingControl_GraphPlottedEvent(Object ^ sender, RoutedEventArgs ^ e)
{
    UpdateGraphAutomationName();
}

void GraphingCalculator::UpdateGraphAutomationName()
{
    int numEquations = 0;
    double xAxisMin, xAxisMax, yAxisMin, yAxisMax;

    // Only count equations that are graphed
    for (auto equation : ViewModel->Equations)
    {
        if (equation->GraphEquation->IsValidated)
        {
            numEquations++;
        }
    }

    GraphingControl->GetDisplayRanges(&xAxisMin, &xAxisMax, &yAxisMin, &yAxisMax);

    GraphControlAutomationName = LocalizationStringUtil::GetLocalizedString(
        AppResourceProvider::GetInstance()->GetResourceString(L"graphAutomationName"),
        xAxisMin.ToString(),
        xAxisMax.ToString(),
        yAxisMin.ToString(),
        yAxisMax.ToString(),
        numEquations.ToString());
}

void GraphingCalculator::GraphMenuFlyoutItem_Click(Object ^ sender, RoutedEventArgs ^ e)
{
    auto dataPackage = ref new DataPackage();
    dataPackage->RequestedOperation = ::DataPackageOperation::Copy;

    auto bitmapStream = GraphingControl->GetGraphBitmapStream();
    dataPackage->SetBitmap(bitmapStream);
    ::Clipboard::SetContent(dataPackage);
}

void GraphingCalculator::OnVisualStateChanged(Object ^ sender, VisualStateChangedEventArgs ^ e)
{
    TraceLogger::GetInstance()->LogVisualStateChanged(ViewMode::Graphing, e->NewState->Name, false);
}

void GraphingCalculator::OnColorValuesChanged(Windows::UI::ViewManagement::UISettings ^ sender, Platform::Object ^ args)
{
    WeakReference weakThis(this);
    this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler([weakThis]() {
                                   auto refThis = weakThis.Resolve<GraphingCalculator>();
                                   if (refThis != nullptr && refThis->IsMatchAppTheme)
                                   {
                                       refThis->UpdateGraphTheme();
                                   }
                               }));
}

void GraphingCalculator::UpdateGraphTheme()
{
    if (m_accessibilitySettings->HighContrast)
    {
        VisualStateManager::GoToState(this, L"GrapherHighContrast", true);
        return;
    }

    if (IsMatchAppTheme && Application::Current->RequestedTheme == ApplicationTheme::Dark)
    {
        VisualStateManager::GoToState(this, L"GrapherDarkTheme", true);
    }
    else
    {
        VisualStateManager::GoToState(this, L"GrapherLightTheme", true);
    }
}

void GraphingCalculator::OnGraphThemeSettingChanged(Object ^ sender, bool isMatchAppTheme)
{
    if (IsMatchAppTheme == isMatchAppTheme)
    {
        return;
    }

    IsMatchAppTheme = isMatchAppTheme;
    WeakReference weakThis(this);
    this->Dispatcher->RunAsync(CoreDispatcherPriority::Normal, ref new DispatchedHandler([weakThis]() {
                                    auto refThis = weakThis.Resolve<GraphingCalculator>();
                                    if (refThis != nullptr)
                                    {
                                        refThis->UpdateGraphTheme();
                                    }
                                }));
}

void GraphingCalculator::GraphViewButton_Click(Object ^ sender, RoutedEventArgs ^ e)
{
    auto narratorNotifier = ref new NarratorNotifier();
    String ^ announcementText;
    if (IsManualAdjustment)
    {
        announcementText = AppResourceProvider::GetInstance()->GetResourceString(L"GraphViewManualAdjustmentAnnouncement");
    }
    else
    {
        GraphingControl->ResetGrid();
        announcementText = AppResourceProvider::GetInstance()->GetResourceString(L"GraphViewAutomaticBestFitAnnouncement");
    }

    auto announcement = CalculatorAnnouncement::GetGraphViewBestFitChangedAnnouncement(announcementText);
    narratorNotifier->Announce(announcement);

    TraceLogger::GetInstance()->LogGraphButtonClicked(GraphButton::GraphView, IsManualAdjustment ? GraphButtonValue::ManualAdjustment : GraphButtonValue::AutomaticBestFit);
}