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

#include "pch.h"
#include "KeyboardShortcutManager.h"
#include "AppResourceProvider.h"
#include "ApplicationViewModel.h"
#include "LocalizationSettings.h"

using namespace Concurrency;
using namespace Platform;
using namespace std;
using namespace Windows::ApplicationModel::Resources;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Controls;
using namespace Windows::Foundation;
using namespace Windows::Foundation::Collections;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml::Controls::Primitives;
using namespace Windows::System;
using namespace Utils;
using namespace CalculatorApp;
using namespace CalculatorApp::Common;
using namespace CalculatorApp::ViewModel;

namespace MUXC = Microsoft::UI::Xaml::Controls;

DEPENDENCY_PROPERTY_INITIALIZATION(KeyboardShortcutManager, Character);
DEPENDENCY_PROPERTY_INITIALIZATION(KeyboardShortcutManager, VirtualKey);
DEPENDENCY_PROPERTY_INITIALIZATION(KeyboardShortcutManager, VirtualKeyControlChord);
DEPENDENCY_PROPERTY_INITIALIZATION(KeyboardShortcutManager, VirtualKeyShiftChord);
DEPENDENCY_PROPERTY_INITIALIZATION(KeyboardShortcutManager, VirtualKeyAltChord);
DEPENDENCY_PROPERTY_INITIALIZATION(KeyboardShortcutManager, VirtualKeyControlShiftChord);
DEPENDENCY_PROPERTY_INITIALIZATION(KeyboardShortcutManager, VirtualKeyInverseChord);
DEPENDENCY_PROPERTY_INITIALIZATION(KeyboardShortcutManager, VirtualKeyControlInverseChord);

static multimap<int, multimap<wchar_t, WeakReference>> s_CharacterForButtons;
static multimap<int, multimap<MyVirtualKey, WeakReference>> s_VirtualKeysForButtons;
static multimap<int, multimap<MyVirtualKey, WeakReference>> s_VirtualKeyControlChordsForButtons;
static multimap<int, multimap<MyVirtualKey, WeakReference>> s_VirtualKeyShiftChordsForButtons;
static multimap<int, multimap<MyVirtualKey, WeakReference>> s_VirtualKeyAltChordsForButtons;
static multimap<int, multimap<MyVirtualKey, WeakReference>> s_VirtualKeyControlShiftChordsForButtons;
static multimap<int, multimap<MyVirtualKey, WeakReference>> s_VirtualKeyInverseChordsForButtons;
static multimap<int, multimap<MyVirtualKey, WeakReference>> s_VirtualKeyControlInverseChordsForButtons;

static const TimeSpan c_lightUpTime = { 500000 }; // Quarter of a second
static multimap<int, bool> s_ShiftKeyPressed;
static multimap<int, bool> s_ControlKeyPressed;
static multimap<int, bool> s_ShiftButtonChecked;
static multimap<int, bool> s_IsDropDownOpen;

static reader_writer_lock s_keyboardShortcutMapLock;

namespace CalculatorApp
{
    namespace Common
    {
        // Lights up all of the buttons in the given range
        // The range is defined by a pair of iterators
        template <typename T> 
        void LightUpButtons(const T& buttons)
        {
            auto iterator = buttons.first;
            for (; iterator != buttons.second; ++iterator)
            {
                auto button = iterator->second.Resolve<ButtonBase>();
                if (button && button->IsEnabled)
                {
                    LightUpButton(button);
                }
            }
        }

        void LightUpButton(ButtonBase^ button)
        {
            // If the button is a toggle button then we don't need 
            // to change the UI of the button
            if (dynamic_cast<ToggleButton^>(button))
            {
                return;
            }

            // The button will go into the visual Pressed state with this call 
            VisualStateManager::GoToState(button, "Pressed", true);

            // This timer will fire after c_lightUpTime and make the button
            // go back to the normal state. 
            // This timer will only fire once after which it will be destroyed
            auto timer = ref new DispatcherTimer();
            timer->Interval = c_lightUpTime;
    
            WeakReference timerWeakReference(timer);
            WeakReference buttonWeakReference(button);
            timer->Tick += ref new EventHandler<Object^>(
                [buttonWeakReference, timerWeakReference](Object^, Object^)
                {
                    auto button = buttonWeakReference.Resolve<ButtonBase>();
                    if (button)
                    {
                        VisualStateManager::GoToState(button, "Normal", true);
                    }

                    // Cancel the timer after we're done so it only fires once
                    auto timer = timerWeakReference.Resolve<DispatcherTimer>();
                    if (timer)
                    {
                        timer->Stop();
                    }
                });
            timer->Start();
        }

        // Looks for the first button reference that it can resolve
        // and execute its command.
        // NOTE: It is assumed that all buttons associated with a particular
        // key have the same command
        template <typename T>
        void RunFirstEnabledButtonCommand(const T& buttons)
        {
            auto buttonIterator = buttons.first;
            for (; buttonIterator != buttons.second; ++buttonIterator)
            {
                auto button = buttonIterator->second.Resolve<ButtonBase>();
                if (button && button->IsEnabled)
                {
                    RunButtonCommand(button);
                    break;
                }
            }
        }

        void RunButtonCommand(ButtonBase^ button)
        {
            if (button->IsEnabled)
            {
                auto command = button->Command;
                auto parameter = button->CommandParameter;
                if (command && command->CanExecute(parameter))
                {
                    command->Execute(parameter);
                }

                auto radio = dynamic_cast<RadioButton^>(button);
                if (radio)
                {
                    radio->IsChecked = true;
                    return;
                }

                auto toggle = dynamic_cast<ToggleButton^>(button);
                if (toggle)
                {
                    toggle->IsChecked = !toggle->IsChecked->Value;
                    return;
                }
            }
        }
    }
}

static multimap<int, bool> s_ignoreNextEscape;
static multimap<int, bool> s_keepIgnoringEscape;
static multimap<int, bool> s_fHonorShortcuts;
static multimap<int, bool> s_fHandledEnter;
static multimap<int, Flyout^> s_AboutFlyout;

void KeyboardShortcutManager::IgnoreEscape(bool onlyOnce)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    int viewId = Utils::GetWindowId();

    if (s_ignoreNextEscape.find(viewId) != s_ignoreNextEscape.end())
    {
        s_ignoreNextEscape.erase(viewId);
        s_ignoreNextEscape.insert(std::make_pair(viewId, true));
    }

    if (s_keepIgnoringEscape.find(viewId) != s_keepIgnoringEscape.end())
    {
        s_keepIgnoringEscape.erase(viewId);
        s_keepIgnoringEscape.insert(std::make_pair(viewId, !onlyOnce));
    }
}

void KeyboardShortcutManager::HonorEscape()
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    int viewId = Utils::GetWindowId();

    if (s_ignoreNextEscape.find(viewId) != s_ignoreNextEscape.end())
    {
        s_ignoreNextEscape.erase(viewId);
        s_ignoreNextEscape.insert(std::make_pair(viewId, false));
    }

    if (s_keepIgnoringEscape.find(viewId) != s_keepIgnoringEscape.end())
    {
        s_keepIgnoringEscape.erase(viewId);
        s_keepIgnoringEscape.insert(std::make_pair(viewId, false));
    }
}

void KeyboardShortcutManager::OnCharacterPropertyChanged(
    DependencyObject^ target, 
    String^ oldValue,
    String^ newValue)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    auto button = safe_cast<ButtonBase^>(target);

    int viewId = Utils::GetWindowId();
    auto iterViewMap = s_CharacterForButtons.find(viewId);

    if (iterViewMap != s_CharacterForButtons.end())
    {
        if (oldValue)
        {
            iterViewMap->second.erase(oldValue->Data()[0]);
        }

        if (newValue)
        {
            if (newValue == L".")
            {
                wchar_t decSep = LocalizationSettings::GetInstance().GetDecimalSeparator();
                iterViewMap->second.insert(std::make_pair(decSep, WeakReference(button)));
            }
            else
            {
                iterViewMap->second.insert(std::make_pair(newValue->Data()[0], WeakReference(button)));
            }
        }
    }
    else
    {
        s_CharacterForButtons.insert(std::make_pair(viewId, std::multimap<wchar_t, WeakReference>()));

        if (newValue == L".")
        {
            wchar_t decSep = LocalizationSettings::GetInstance().GetDecimalSeparator();
            s_CharacterForButtons.find(viewId)->second.insert(std::make_pair(decSep, WeakReference(button)));
        }
        else
        {
            s_CharacterForButtons.find(viewId)->second.insert(std::make_pair(newValue->Data()[0], WeakReference(button)));
        }
    }
}

void KeyboardShortcutManager::OnVirtualKeyPropertyChanged(
    DependencyObject^ target,
    MyVirtualKey /*oldValue*/,
    MyVirtualKey newValue)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    auto button = static_cast<ButtonBase^>(target);
    
    int viewId = Utils::GetWindowId();
    auto iterViewMap = s_VirtualKeysForButtons.find(viewId);
    
    // Check if the View Id has already been registered
    if (iterViewMap != s_VirtualKeysForButtons.end())
    {
        iterViewMap->second.insert(std::make_pair(newValue, WeakReference(button)));
    }
    else
    {
        // If the View Id is not already registered, then register it and make the entry
        s_VirtualKeysForButtons.insert(std::make_pair(viewId, std::multimap<MyVirtualKey, WeakReference>()));
        s_VirtualKeysForButtons.find(viewId)->second.insert(std::make_pair(newValue, WeakReference(button)));
    }
}

void KeyboardShortcutManager::OnVirtualKeyControlChordPropertyChanged(
    DependencyObject^ target, 
    MyVirtualKey /*oldValue*/,
    MyVirtualKey newValue)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    Control^ control = dynamic_cast<ButtonBase^>(target);

    if (control == nullptr)
    {
        // Handling Ctrl+E shortcut for Date Calc, target would be NavigationView^ in that case
        control = safe_cast<MUXC::NavigationView^>(target);
    }

    int viewId = Utils::GetWindowId();
    auto iterViewMap = s_VirtualKeyControlChordsForButtons.find(viewId);

    // Check if the View Id has already been registered
    if (iterViewMap != s_VirtualKeyControlChordsForButtons.end())
    {
        iterViewMap->second.insert(std::make_pair(newValue, WeakReference(control)));
    }
    else
    {
        // If the View Id is not already registered, then register it and make the entry
        s_VirtualKeyControlChordsForButtons.insert(std::make_pair(viewId, std::multimap<MyVirtualKey, WeakReference>()));
        s_VirtualKeyControlChordsForButtons.find(viewId)->second.insert(std::make_pair(newValue, WeakReference(control)));
    }
}

void KeyboardShortcutManager::OnVirtualKeyShiftChordPropertyChanged(
    DependencyObject^ target,
    MyVirtualKey /*oldValue*/,
    MyVirtualKey newValue)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    auto button = safe_cast<ButtonBase^>(target);

    int viewId = Utils::GetWindowId();
    auto iterViewMap = s_VirtualKeyShiftChordsForButtons.find(viewId);

    // Check if the View Id has already been registered
    if (iterViewMap != s_VirtualKeyShiftChordsForButtons.end())
    {
        iterViewMap->second.insert(std::make_pair(newValue, WeakReference(button)));
    }
    else
    {
        // If the View Id is not already registered, then register it and make the entry
        s_VirtualKeyShiftChordsForButtons.insert(std::make_pair(viewId, std::multimap<MyVirtualKey, WeakReference>()));
        s_VirtualKeyShiftChordsForButtons.find(viewId)->second.insert(std::make_pair(newValue, WeakReference(button)));
    }
}

void KeyboardShortcutManager::OnVirtualKeyAltChordPropertyChanged(
    DependencyObject^ target,
    MyVirtualKey /*oldValue*/,
    MyVirtualKey newValue)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    MUXC::NavigationView^ navView = safe_cast<MUXC::NavigationView^>(target);

    int viewId = Utils::GetWindowId();
    auto iterViewMap = s_VirtualKeyAltChordsForButtons.find(viewId);

    // Check if the View Id has already been registered
    if (iterViewMap != s_VirtualKeyAltChordsForButtons.end())
    {
        iterViewMap->second.insert(std::make_pair(newValue, WeakReference(navView)));
    }
    else
    {
        // If the View Id is not already registered, then register it and make the entry
        s_VirtualKeyAltChordsForButtons.insert(std::make_pair(viewId, std::multimap<MyVirtualKey, WeakReference>()));
        s_VirtualKeyAltChordsForButtons.find(viewId)->second.insert(std::make_pair(newValue, WeakReference(navView)));
    }
}

void KeyboardShortcutManager::OnVirtualKeyControlShiftChordPropertyChanged(
    DependencyObject^ target,
    MyVirtualKey /*oldValue*/,
    MyVirtualKey newValue)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    auto button = safe_cast<ButtonBase^>(target);

    int viewId = Utils::GetWindowId();
    auto iterViewMap = s_VirtualKeyControlShiftChordsForButtons.find(viewId);

    // Check if the View Id has already been registered
    if (iterViewMap != s_VirtualKeyControlShiftChordsForButtons.end())
    {
        iterViewMap->second.insert(std::make_pair(newValue, WeakReference(button)));
    }
    else
    {
        // If the View Id is not already registered, then register it and make the entry
        s_VirtualKeyControlShiftChordsForButtons.insert(std::make_pair(viewId, std::multimap<MyVirtualKey, WeakReference>()));
        s_VirtualKeyControlShiftChordsForButtons.find(viewId)->second.insert(std::make_pair(newValue, WeakReference(button)));
    }
}

void KeyboardShortcutManager::OnVirtualKeyInverseChordPropertyChanged(
    DependencyObject^ target,
    MyVirtualKey /*oldValue*/,
    MyVirtualKey newValue)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    auto button = safe_cast<ButtonBase^>(target);

    int viewId = Utils::GetWindowId();
    auto iterViewMap = s_VirtualKeyInverseChordsForButtons.find(viewId);

    // Check if the View Id has already been registered
    if (iterViewMap != s_VirtualKeyInverseChordsForButtons.end())
    {
        iterViewMap->second.insert(std::make_pair(newValue, WeakReference(button)));
    }
    else
    {
        // If the View Id is not already registered, then register it and make the entry
        s_VirtualKeyInverseChordsForButtons.insert(std::make_pair(viewId, std::multimap<MyVirtualKey, WeakReference>()));
        s_VirtualKeyInverseChordsForButtons.find(viewId)->second.insert(std::make_pair(newValue, WeakReference(button)));
    }
}

void KeyboardShortcutManager::OnVirtualKeyControlInverseChordPropertyChanged(
    DependencyObject^ target,
    MyVirtualKey /*oldValue*/,
    MyVirtualKey newValue)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    auto button = safe_cast<ButtonBase^>(target);

    int viewId = Utils::GetWindowId();
    auto iterViewMap = s_VirtualKeyControlInverseChordsForButtons.find(viewId);

    // Check if the View Id has already been registered
    if (iterViewMap != s_VirtualKeyControlInverseChordsForButtons.end())
    {
        iterViewMap->second.insert(std::make_pair(newValue, WeakReference(button)));
    }
    else
    {
        // If the View Id is not already registered, then register it and make the entry
        s_VirtualKeyControlInverseChordsForButtons.insert(std::make_pair(viewId, std::multimap<MyVirtualKey, WeakReference>()));
        s_VirtualKeyControlInverseChordsForButtons.find(viewId)->second.insert(std::make_pair(newValue, WeakReference(button)));
    }
}

// In the three event handlers bellow we will not mark the event as handled
// because this is a sumplemental operation and we don't want to interfere with 
// the normal keyboard handling.
void KeyboardShortcutManager::OnCharacterReceivedHandler(CoreWindow^ sender, CharacterReceivedEventArgs^ args)
{
    int viewId = Utils::GetWindowId();
    auto currentHonorShortcuts = s_fHonorShortcuts.find(viewId);

    if (currentHonorShortcuts != s_fHonorShortcuts.end())
    {
        if (currentHonorShortcuts->second)
        {
            wchar_t character = static_cast<wchar_t>(args->KeyCode);
            auto buttons = s_CharacterForButtons.find(viewId)->second.equal_range(character);

            RunFirstEnabledButtonCommand(buttons);

            LightUpButtons(buttons);
        }
    }
}

const std::multimap<MyVirtualKey, WeakReference>& GetCurrentKeyDictionary(MyVirtualKey key, bool altPressed = false)
{
    int viewId = Utils::GetWindowId();

    if (altPressed)
    {
        return s_VirtualKeyAltChordsForButtons.find(viewId)->second;
    }
    else if ((s_ShiftKeyPressed.find(viewId)->second) && ((Window::Current->CoreWindow->GetKeyState(VirtualKey::Control) & CoreVirtualKeyStates::Down) == CoreVirtualKeyStates::Down))
    {
        return s_VirtualKeyControlShiftChordsForButtons.find(viewId)->second;
    }
    else if (s_ShiftKeyPressed.find(viewId)->second)
    {
        return s_VirtualKeyShiftChordsForButtons.find(viewId)->second;
    }
    else if (s_ShiftButtonChecked.find(viewId)->second)
    {
        if ((Window::Current->CoreWindow->GetKeyState(VirtualKey::Control) & CoreVirtualKeyStates::Down) == CoreVirtualKeyStates::Down)
        {
            auto iterViewMap = s_VirtualKeyControlInverseChordsForButtons.find(viewId);
            if (iterViewMap != s_VirtualKeyControlInverseChordsForButtons.end())
            {
                for (auto iterator = iterViewMap->second.begin(); iterator != iterViewMap->second.end(); ++iterator)
                {
                    if (key == iterator->first)
                    {
                        return s_VirtualKeyControlInverseChordsForButtons.find(viewId)->second;
                    }
                }
            }
        }
        else
        {
            auto iterViewMap = s_VirtualKeyControlInverseChordsForButtons.find(viewId);
            if (iterViewMap != s_VirtualKeyControlInverseChordsForButtons.end())
            {
                for (auto iterator = iterViewMap->second.begin(); iterator != iterViewMap->second.end(); ++iterator)
                {
                    if (key == iterator->first)
                    {
                        return s_VirtualKeyInverseChordsForButtons.find(viewId)->second;
                    }
                }
            }
        }
    }
    if ((Window::Current->CoreWindow->GetKeyState(VirtualKey::Control) & CoreVirtualKeyStates::Down) == CoreVirtualKeyStates::Down)
    {
        return s_VirtualKeyControlChordsForButtons.find(viewId)->second;
    }
    else
    {
        return s_VirtualKeysForButtons.find(viewId)->second;
    }
}

void KeyboardShortcutManager::OnKeyDownHandler(CoreWindow^ sender, KeyEventArgs^ args)
{
    // If keyboard shortcuts like Ctrl+C or Ctrl+V are not handled
    if (!args->Handled)
    {
        auto key = args->VirtualKey;
        int viewId = Utils::GetWindowId();

        auto currentControlKeyPressed = s_ControlKeyPressed.find(viewId);
        auto currentShiftKeyPressed = s_ShiftKeyPressed.find(viewId);

        bool isControlKeyPressed = (currentControlKeyPressed != s_ControlKeyPressed.end()) && (currentControlKeyPressed->second);
        bool isShiftKeyPressed = (currentShiftKeyPressed != s_ShiftKeyPressed.end()) && (currentShiftKeyPressed->second);

        // Handle Ctrl + E for DateCalculator
        if ((key == VirtualKey::E) &&
            isControlKeyPressed && 
            !isShiftKeyPressed)
        {
            const auto& lookupMap = GetCurrentKeyDictionary(static_cast<MyVirtualKey>(key));
            auto buttons = lookupMap.equal_range(static_cast<MyVirtualKey>(key));
            auto navView = buttons.first->second.Resolve<MUXC::NavigationView>();
            auto appViewModel = safe_cast<ApplicationViewModel^>(navView->DataContext);
            appViewModel->Mode = ViewMode::Date;
            auto categoryName = AppResourceProvider::GetInstance().GetResourceString(L"DateCalculationModeText");
            appViewModel->CategoryName = categoryName;

            auto menuItems = static_cast<IObservableVector<Object^>^>(navView->MenuItemsSource);
            auto flatIndex = NavCategory::GetFlatIndex(ViewMode::Date);
            navView->SelectedItem = menuItems->GetAt(flatIndex);
            return;
        }

    auto currentHonorShortcuts = s_fHonorShortcuts.find(viewId);

        auto currentIgnoreNextEscape = s_ignoreNextEscape.find(viewId);

        if (currentIgnoreNextEscape != s_ignoreNextEscape.end())
        {
            if (currentIgnoreNextEscape->second && key == VirtualKey::Escape)
            {
                auto currentKeepIgnoringEscape = s_keepIgnoringEscape.find(viewId);

                if (currentKeepIgnoringEscape != s_keepIgnoringEscape.end())
                {
                    if (!currentKeepIgnoringEscape->second)
                    {
                        HonorEscape();
                    }
                    return;
                }
            }
        }

        if (key == VirtualKey::Control)
        {
            // Writer lock for the static maps
            reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

            auto currentControlKeyPressed = s_ControlKeyPressed.find(viewId);

            if (currentControlKeyPressed != s_ControlKeyPressed.end())
            {
                s_ControlKeyPressed.erase(viewId);
                s_ControlKeyPressed.insert(std::make_pair(viewId, true));
            }
            return;
        }
        else if (key == VirtualKey::Shift)
        {
            // Writer lock for the static maps
            reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

            auto currentShiftKeyPressed = s_ShiftKeyPressed.find(viewId);

            if (currentShiftKeyPressed != s_ShiftKeyPressed.end())
            {
                s_ShiftKeyPressed.erase(viewId);
                s_ShiftKeyPressed.insert(std::make_pair(viewId, true));
            }
            return;
        }

        const auto& lookupMap = GetCurrentKeyDictionary(static_cast<MyVirtualKey>(key));
        auto buttons = lookupMap.equal_range(static_cast<MyVirtualKey>(key));

        auto currentIsDropDownOpen = s_IsDropDownOpen.find(viewId);

        if (currentHonorShortcuts != s_fHonorShortcuts.end())
        {
            if (currentHonorShortcuts->second)
            {
                RunFirstEnabledButtonCommand(buttons);

                // Ctrl+C and Ctrl+V shifts focus to some button because of which enter doesn't work after copy/paste. So don't shift focus if Ctrl+C or Ctrl+V is pressed.
                // When drop down is open, pressing escape shifts focus to clear button. So dont's shift focus if drop down is open.
                // Ctrl+Insert is equivalent to Ctrl+C and Shift+Insert is equivalent to Ctrl+V
                if (currentIsDropDownOpen != s_IsDropDownOpen.end() && !currentIsDropDownOpen->second)
                {
                    // Do not Light Up Buttons when Ctrl+C, Ctrl+V, Ctrl+Insert or Shift+Insert is pressed
                    if (!(isControlKeyPressed && (key == VirtualKey::C || key == VirtualKey::V || key == VirtualKey::Insert))
                        && !(isShiftKeyPressed && (key == VirtualKey::Insert)))
                    {
                        LightUpButtons(buttons);
                    }
                }
            }
        }
    }
}

void KeyboardShortcutManager::OnKeyUpHandler(CoreWindow^ sender, KeyEventArgs^ args)
{
    int viewId = Utils::GetWindowId();
    auto key = args->VirtualKey;

    if (args->VirtualKey == VirtualKey::Shift)
    {
        // Writer lock for the static maps
        reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

        auto currentShiftKeyPressed = s_ShiftKeyPressed.find(viewId);

        if (currentShiftKeyPressed != s_ShiftKeyPressed.end())
        {
            s_ShiftKeyPressed.erase(viewId);
            s_ShiftKeyPressed.insert(std::make_pair(viewId, false));
        }
    }
    else if (args->VirtualKey == VirtualKey::Control)
    {
        // Writer lock for the static maps
        reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

        auto currentControlKeyPressed = s_ControlKeyPressed.find(viewId);

        if (currentControlKeyPressed != s_ControlKeyPressed.end())
        {
            s_ControlKeyPressed.erase(viewId);
            s_ControlKeyPressed.insert(std::make_pair(viewId, false));
        }
    }
}

void KeyboardShortcutManager::OnAcceleratorKeyActivated(CoreDispatcher^, AcceleratorKeyEventArgs^ args)
{
    if (args->KeyStatus.IsKeyReleased)
    {
        auto key = args->VirtualKey;
        bool altPressed = args->KeyStatus.IsMenuKeyDown;

        // If the Alt/Menu key is not pressed then we don't care about the key anymore
        if (!altPressed)
        {
            return;
        }

        const auto& lookupMap = GetCurrentKeyDictionary(static_cast<MyVirtualKey>(key), altPressed);
        auto listItems = lookupMap.equal_range(static_cast<MyVirtualKey>(key));
        for (auto listIterator = listItems.first; listIterator != listItems.second; ++listIterator)
        {
            auto item = listIterator->second.Resolve<MUXC::NavigationView>();
            if (item != nullptr)
            {
                auto navView = safe_cast<MUXC::NavigationView^> (item);

                auto menuItems = static_cast<IObservableVector<Object^>^>(navView->MenuItemsSource);
                if (menuItems != nullptr)
                {
                    auto vm = safe_cast<ApplicationViewModel^>(navView->DataContext);
                    if (nullptr != vm)
                    {
                        ViewMode toMode = NavCategory::GetViewModeForVirtualKey(static_cast<MyVirtualKey>(key));
                        if (NavCategory::IsValidViewMode(toMode))
                        {
                            vm->Mode = toMode;
                            navView->SelectedItem = menuItems->GetAt(NavCategory::GetFlatIndex(toMode));
                        }
                    }
                }
                break;
            }
        }
    }

    if (args->VirtualKey == VirtualKey::Escape)
    {
        int viewId = Utils::GetWindowId();
        auto iterViewMap = s_AboutFlyout.find(viewId);
        
        if ((iterViewMap != s_AboutFlyout.end()) && (iterViewMap->second != nullptr))
        {
            iterViewMap->second->Hide();
        }
    }
}

void KeyboardShortcutManager::Initialize()
{
    auto coreWindow = Window::Current->CoreWindow;
    coreWindow->CharacterReceived += 
        ref new TypedEventHandler<CoreWindow^, CharacterReceivedEventArgs^>(&KeyboardShortcutManager::OnCharacterReceivedHandler);
    coreWindow->KeyDown += 
        ref new TypedEventHandler<CoreWindow^, KeyEventArgs^>(&KeyboardShortcutManager::OnKeyDownHandler);
    coreWindow->KeyUp +=
        ref new TypedEventHandler<CoreWindow^, KeyEventArgs^>(&KeyboardShortcutManager::OnKeyUpHandler);
    coreWindow->Dispatcher->AcceleratorKeyActivated +=
        ref new TypedEventHandler<CoreDispatcher^, AcceleratorKeyEventArgs^>(&KeyboardShortcutManager::OnAcceleratorKeyActivated);

    KeyboardShortcutManager::RegisterNewAppViewId();
}

void KeyboardShortcutManager::ShiftButtonChecked(bool checked)
{
    int viewId = Utils::GetWindowId();

    if (s_ShiftButtonChecked.find(viewId) != s_ShiftButtonChecked.end())
    {
        s_ShiftButtonChecked.erase(viewId);
        s_ShiftButtonChecked.insert(std::make_pair(viewId, checked));
    }
}

void KeyboardShortcutManager::UpdateDropDownState(bool isOpen)
{
    int viewId = Utils::GetWindowId();

    if (s_IsDropDownOpen.find(viewId) != s_IsDropDownOpen.end())
    {
        s_IsDropDownOpen.erase(viewId);
        s_IsDropDownOpen.insert(std::make_pair(viewId, isOpen));
    }
}

void KeyboardShortcutManager::UpdateDropDownState(Flyout^ aboutPageFlyout)
{
    int viewId = Utils::GetWindowId();
    
    if (s_AboutFlyout.find(viewId) != s_AboutFlyout.end())
    {
        s_AboutFlyout.erase(viewId);
        s_AboutFlyout.insert(std::make_pair(viewId, aboutPageFlyout));
    }
}

void KeyboardShortcutManager::HonorShortcuts(bool allow)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    int viewId = Utils::GetWindowId();

    if (s_fHonorShortcuts.find(viewId) != s_fHonorShortcuts.end())
    {
        s_fHonorShortcuts.erase(viewId);
        s_fHonorShortcuts.insert(std::make_pair(viewId, allow));
    }
}

void KeyboardShortcutManager::HandledEnter(bool ishandled)
{
    int viewId = Utils::GetWindowId();

    if (s_fHandledEnter.find(viewId) != s_fHandledEnter.end())
    {
        s_fHandledEnter.erase(viewId);
        s_fHandledEnter.insert(std::make_pair(viewId, ishandled));
    }
}

void KeyboardShortcutManager::RegisterNewAppViewId()
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    int appViewId = Utils::GetWindowId();

    // Check if the View Id has already been registered
    if (s_CharacterForButtons.find(appViewId) == s_CharacterForButtons.end())
    {
        s_CharacterForButtons.insert(std::make_pair(appViewId, std::multimap<wchar_t, WeakReference>()));
    }
    
    if (s_VirtualKeysForButtons.find(appViewId) == s_VirtualKeysForButtons.end())
    {
        s_VirtualKeysForButtons.insert(std::make_pair(appViewId, std::multimap<MyVirtualKey, WeakReference>()));
    }

    if (s_VirtualKeyControlChordsForButtons.find(appViewId) == s_VirtualKeyControlChordsForButtons.end())
    {
        s_VirtualKeyControlChordsForButtons.insert(std::make_pair(appViewId, std::multimap<MyVirtualKey, WeakReference>()));
    }

    if (s_VirtualKeyShiftChordsForButtons.find(appViewId) == s_VirtualKeyShiftChordsForButtons.end())
    {
        s_VirtualKeyShiftChordsForButtons.insert(std::make_pair(appViewId, std::multimap<MyVirtualKey, WeakReference>()));
    }

    if (s_VirtualKeyAltChordsForButtons.find(appViewId) == s_VirtualKeyAltChordsForButtons.end())
    {
        s_VirtualKeyAltChordsForButtons.insert(std::make_pair(appViewId, std::multimap<MyVirtualKey, WeakReference>()));
    }
    
    if (s_VirtualKeyControlShiftChordsForButtons.find(appViewId) == s_VirtualKeyControlShiftChordsForButtons.end())
    {
        s_VirtualKeyControlShiftChordsForButtons.insert(std::make_pair(appViewId, std::multimap<MyVirtualKey, WeakReference>()));
    }
    
    if (s_VirtualKeyInverseChordsForButtons.find(appViewId) == s_VirtualKeyInverseChordsForButtons.end())
    {
        s_VirtualKeyInverseChordsForButtons.insert(std::make_pair(appViewId, std::multimap<MyVirtualKey, WeakReference>()));
    }
    
    if (s_VirtualKeyControlInverseChordsForButtons.find(appViewId) == s_VirtualKeyControlInverseChordsForButtons.end())
    {
        s_VirtualKeyControlInverseChordsForButtons.insert(std::make_pair(appViewId, std::multimap<MyVirtualKey, WeakReference>()));
    }

    s_ShiftKeyPressed.insert(std::make_pair(appViewId, false));
    s_ControlKeyPressed.insert(std::make_pair(appViewId, false));
    s_ShiftButtonChecked.insert(std::make_pair(appViewId, false));
    s_IsDropDownOpen.insert(std::make_pair(appViewId, false));
    s_ignoreNextEscape.insert(std::make_pair(appViewId, false));
    s_keepIgnoringEscape.insert(std::make_pair(appViewId, false));
    s_fHonorShortcuts.insert(std::make_pair(appViewId, true));
    s_fHandledEnter.insert(std::make_pair(appViewId, true));
    s_AboutFlyout.insert(std::make_pair(appViewId, nullptr));
}

void KeyboardShortcutManager::OnWindowClosed(int viewId)
{
    // Writer lock for the static maps
    reader_writer_lock::scoped_lock lock(s_keyboardShortcutMapLock);

    s_CharacterForButtons.erase(viewId);

    s_VirtualKeysForButtons.erase(viewId);
    s_VirtualKeyControlChordsForButtons.erase(viewId);
    s_VirtualKeyShiftChordsForButtons.erase(viewId);
    s_VirtualKeyAltChordsForButtons.erase(viewId);
    s_VirtualKeyControlShiftChordsForButtons.erase(viewId);
    s_VirtualKeyInverseChordsForButtons.erase(viewId);
    s_VirtualKeyControlInverseChordsForButtons.erase(viewId);

    s_ShiftKeyPressed.erase(viewId);
    s_ControlKeyPressed.erase(viewId);
    s_ShiftButtonChecked.erase(viewId);
    s_IsDropDownOpen.erase(viewId);
    s_ignoreNextEscape.erase(viewId);
    s_keepIgnoringEscape.erase(viewId);
    s_fHonorShortcuts.erase(viewId);
    s_fHandledEnter.erase(viewId);
    s_AboutFlyout.erase(viewId);
}