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

// UnitConverter.xaml.cpp
// Implementation of the UnitConverter class

#include "pch.h"
#include "UnitConverter.xaml.h"
#include "CalcViewModel/Common/TraceLogger.h"
#include "CalcViewModel/UnitConverterViewModel.h"
#include "Controls/CalculationResult.h"
#include "Controls/CalculatorButton.h"
#include "CalcViewModel/Common/CopyPasteManager.h"
#include "CalcViewModel/Common/LocalizationService.h"
#include "CalcViewModel/Common/LocalizationSettings.h"
#include "Common/KeyboardShortcutManager.h"

using namespace std;
using namespace CalculatorApp;
using namespace CalculatorApp::Common;
using namespace CalculatorApp::Controls;
using namespace concurrency;
using namespace Windows::System;
using namespace Platform;
using namespace ViewModel;
using namespace Windows::Foundation;
using namespace Windows::Foundation::Collections;
using namespace Windows::UI::Core;
using namespace Windows::UI::Text;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Automation;
using namespace Windows::UI::Xaml::Automation::Peers;
using namespace Windows::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Controls::Primitives;
using namespace Windows::UI::Xaml::Data;
using namespace Windows::UI::Xaml::Documents;
using namespace Windows::UI::Xaml::Input;
using namespace Windows::UI::Xaml::Interop;
using namespace Windows::UI::Xaml::Media;
using namespace Windows::UI::Xaml::Navigation;
using namespace Windows::UI::ViewManagement;

// Calculate number of 100-nanosecond intervals in 500 milliseconds.
// There are 10,000 intervals in 1 ms.
static const long long DURATION_500_MS = 10000 * 500;

UnitConverter::UnitConverter()
    : m_meteredConnectionOverride(false)
{
    m_layoutDirection = LocalizationService::GetInstance()->GetFlowDirection();
    m_FlowDirectionHorizontalAlignment = m_layoutDirection == ::FlowDirection::RightToLeft ? ::HorizontalAlignment::Right : ::HorizontalAlignment::Left;

    InitializeComponent();

    // adding ESC key shortcut binding to clear button
    ClearEntryButtonPos0->SetValue(Common::KeyboardShortcutManager::VirtualKeyProperty, Common::MyVirtualKey::Escape);

    // Is currency symbol preference set to right side
    bool preferRight = LocalizationSettings::GetInstance().GetCurrencySymbolPrecedence() == 0;
    VisualStateManager::GoToState(this, preferRight ? "CurrencySymbolRightState" : "CurrencySymbolLeftState", false);

    auto resLoader = AppResourceProvider::GetInstance();
    m_chargesMayApplyText = resLoader->GetResourceString(L"DataChargesMayApply");
    m_failedToRefreshText = resLoader->GetResourceString(L"FailedToRefresh");

    InitializeOfflineStatusTextBlock();

    m_resultsFlyout = static_cast<MenuFlyout ^>(Resources->Lookup(L"CalculationResultContextMenu"));
    CopyMenuItem->Text = resLoader->GetResourceString(L"copyMenuItem");
    PasteMenuItem->Text = resLoader->GetResourceString(L"pasteMenuItem");
}

void UnitConverter::OnPropertyChanged(_In_ Object ^ sender, _In_ PropertyChangedEventArgs ^ e)
{
    String ^ propertyName = e->PropertyName;
    if (propertyName == UnitConverterViewModel::NetworkBehaviorPropertyName || propertyName == UnitConverterViewModel::CurrencyDataLoadFailedPropertyName)
    {
        OnNetworkBehaviorChanged();
    }
    else if (propertyName == UnitConverterViewModel::CurrencyDataIsWeekOldPropertyName)
    {
        SetCurrencyTimestampFontWeight();
    }
    else if (
        propertyName == UnitConverterViewModel::IsCurrencyLoadingVisiblePropertyName
        || propertyName == UnitConverterViewModel::IsCurrencyCurrentCategoryPropertyName)
    {
        OnIsDisplayVisibleChanged();
    }
}

void UnitConverter::OnNetworkBehaviorChanged()
{
    switch (Model->NetworkBehavior)
    {
    case NetworkAccessBehavior::Normal:
        OnNormalNetworkAccess();
        break;
    case NetworkAccessBehavior::OptIn:
        OnOptInNetworkAccess();
        break;
    case NetworkAccessBehavior::Offline:
        OnOfflineNetworkAccess();
        break;
    }
}

void UnitConverter::OnNormalNetworkAccess()
{
    CurrencyRefreshBlockControl->Visibility = ::Visibility::Visible;
    OfflineBlock->Visibility = ::Visibility::Collapsed;

    if (Model->CurrencyDataLoadFailed)
    {
        SetFailedToRefreshStatus();
    }
    else
    {
        SetNormalCurrencyStatus();
    }
}

void UnitConverter::OnOptInNetworkAccess()
{
    CurrencyRefreshBlockControl->Visibility = ::Visibility::Visible;
    OfflineBlock->Visibility = ::Visibility::Collapsed;

    if (m_meteredConnectionOverride && Model->CurrencyDataLoadFailed)
    {
        SetFailedToRefreshStatus();
    }
    else
    {
        SetChargesMayApplyStatus();
    }
}

void UnitConverter::OnOfflineNetworkAccess()
{
    CurrencyRefreshBlockControl->Visibility = ::Visibility::Collapsed;
    OfflineBlock->Visibility = ::Visibility::Visible;
}

void UnitConverter::SetNormalCurrencyStatus()
{
    CurrencySecondaryStatus->Text = L"";
}

void UnitConverter::SetChargesMayApplyStatus()
{
    VisualStateManager::GoToState(this, L"ChargesMayApplyCurrencyStatus", false);
    CurrencySecondaryStatus->Text = m_chargesMayApplyText;
}

void UnitConverter::SetFailedToRefreshStatus()
{
    VisualStateManager::GoToState(this, L"FailedCurrencyStatus", false);
    CurrencySecondaryStatus->Text = m_failedToRefreshText;
}

void UnitConverter::InitializeOfflineStatusTextBlock()
{
    auto resProvider = AppResourceProvider::GetInstance();
    std::wstring offlineStatusHyperlinkText = resProvider->GetResourceString(L"OfflineStatusHyperlinkText")->Data();

    // The resource string has the 'NetworkSettings' hyperlink wrapped with '%HL%'.
    // Break the string and assign pieces appropriately.
    static const std::wstring delimiter{ L"%HL%" };
    static const size_t delimiterLength{ delimiter.length() };

    // Find the delimiters.
    size_t firstSplitPosition = offlineStatusHyperlinkText.find(delimiter, 0);
    assert(firstSplitPosition != std::wstring::npos);
    size_t secondSplitPosition = offlineStatusHyperlinkText.find(delimiter, firstSplitPosition + 1);
    assert(secondSplitPosition != std::wstring::npos);
    size_t hyperlinkTextLength = secondSplitPosition - (firstSplitPosition + delimiterLength);

    // Assign pieces.
    auto offlineStatusTextBeforeHyperlink = ref new String(offlineStatusHyperlinkText.substr(0, firstSplitPosition).c_str());
    auto offlineStatusTextLink = ref new String(offlineStatusHyperlinkText.substr(firstSplitPosition + delimiterLength, hyperlinkTextLength).c_str());
    auto offlineStatusTextAfterHyperlink = ref new String(offlineStatusHyperlinkText.substr(secondSplitPosition + delimiterLength).c_str());

    OfflineRunBeforeLink->Text = offlineStatusTextBeforeHyperlink;
    OfflineRunLink->Text = offlineStatusTextLink;
    OfflineRunAfterLink->Text = offlineStatusTextAfterHyperlink;

    AutomationProperties::SetName(OfflineBlock, offlineStatusTextBeforeHyperlink + L" " + offlineStatusTextLink + L" " + offlineStatusTextAfterHyperlink);
}

void UnitConverter::SetCurrencyTimestampFontWeight()
{
    if (Model->CurrencyDataIsWeekOld)
    {
        VisualStateManager::GoToState(this, L"WeekOldTimestamp", false);
    }
    else
    {
        VisualStateManager::GoToState(this, L"DefaultTimestamp", false);
    }
}

void UnitConverter::OnValueKeyDown(Platform::Object ^ sender, Windows::UI::Xaml::Input::KeyRoutedEventArgs ^ e)
{
    if (e->Key == VirtualKey::Space)
    {
        OnValueSelected(sender);
    }
}

void UnitConverter::OnContextRequested(UIElement ^ sender, ContextRequestedEventArgs ^ e)
{
    OnValueSelected(sender);
    auto requestedElement = safe_cast<FrameworkElement ^>(sender);

    PasteMenuItem->IsEnabled = CopyPasteManager::HasStringToPaste();

    Point point;
    if (e->TryGetPosition(requestedElement, &point))
    {
        m_resultsFlyout->ShowAt(requestedElement, point);
    }
    else
    {
        // Not invoked via pointer, so let XAML choose a default location.
        m_resultsFlyout->ShowAt(requestedElement);
    }

    e->Handled = true;
}

void UnitConverter::OnContextCanceled(UIElement ^ sender, RoutedEventArgs ^ e)
{
    m_resultsFlyout->Hide();
}

void UnitConverter::OnCopyMenuItemClicked(_In_ Object ^ sender, _In_ RoutedEventArgs ^ e)
{
    auto calcResult = safe_cast<CalculationResult ^>(m_resultsFlyout->Target);
    CopyPasteManager::CopyToClipboard(calcResult->GetRawDisplayValue());
}

void UnitConverter::OnPasteMenuItemClicked(_In_ Object ^ sender, _In_ RoutedEventArgs ^ e)
{
    auto that(this);
    create_task(CopyPasteManager::GetStringToPaste(Model->Mode, CategoryGroupType::Converter, NumberBase::Unknown, BitLength::BitLengthUnknown))
        .then([that](String ^ pastedString) { that->Model->OnPaste(pastedString); });
}

void UnitConverter::AnimateConverter()
{
    static auto uiSettings = ref new UISettings();
    if (uiSettings->AnimationsEnabled)
    {
        AnimationStory->Begin();
    }
}

void UnitConverter::OnValueSelected(_In_ Platform::Object ^ sender)
{
    auto value = safe_cast<CalculationResult ^>(sender);
    // update the font size since the font is changed to bold
    value->UpdateTextState();
    safe_cast<UnitConverterViewModel ^>(this->DataContext)->OnValueActivated(AsActivatable(value));
}

void UnitConverter::UpdateDropDownState(_In_ Platform::Object ^ sender, _In_ Platform::Object ^ e)
{
    safe_cast<UnitConverterViewModel ^>(this->DataContext)->IsDropDownOpen = (Units1->IsDropDownOpen) || (Units2->IsDropDownOpen);
    KeyboardShortcutManager::UpdateDropDownState((Units1->IsDropDownOpen) || (Units2->IsDropDownOpen));
}

void UnitConverter::OnLoaded(_In_ Object ^, _In_ RoutedEventArgs ^)
{
}

void UnitConverter::SetDefaultFocus()
{
    const std::vector<Control ^> focusPrecedence = { Value1, CurrencyRefreshBlockControl, OfflineBlock, ClearEntryButtonPos0 };

    for (Control ^ control : focusPrecedence)
    {
        if (control->Focus(::FocusState::Programmatic))
        {
            break;
        }
    }
}

void UnitConverter::CurrencyRefreshButton_Click(_In_ Object ^ /*sender*/, _In_ RoutedEventArgs ^ /*e*/)
{
    // If IsCurrencyLoadingVisible is true that means CurrencyRefreshButton_Click was recently called
    // and is still executing. In this case there is no reason to process the click.
    if (!Model->IsCurrencyLoadingVisible)
    {
        if (Model->NetworkBehavior == NetworkAccessBehavior::OptIn)
        {
            m_meteredConnectionOverride = true;
        }

        Model->RefreshCurrencyRatios();
    }
}

void UnitConverter::OnDataContextChanged(_In_ FrameworkElement ^ sender, _In_ DataContextChangedEventArgs ^ args)
{
    Model->PropertyChanged -= m_propertyChangedToken;

    m_propertyChangedToken = Model->PropertyChanged += ref new PropertyChangedEventHandler(this, &UnitConverter::OnPropertyChanged);

    OnNetworkBehaviorChanged();
}

void UnitConverter::Units1_IsEnabledChanged(Object ^ sender, DependencyPropertyChangedEventArgs ^ e)
{
    if ((Units1->Visibility == ::Visibility::Visible) && Units1->IsEnabled)
    {
        SetDefaultFocus();
    }
}

void UnitConverter::OnIsDisplayVisibleChanged()
{
    if (!Model->IsCurrencyCurrentCategory)
    {
        VisualStateManager::GoToState(this, UnitLoadedState->Name, false);
    }
    else
    {
        if (Model->IsCurrencyLoadingVisible)
        {
            VisualStateManager::GoToState(this, UnitNotLoadedState->Name, false);
            StartProgressRingWithDelay();
        }
        else
        {
            HideProgressRing();
            VisualStateManager::GoToState(this, !Model->CurrencyTimestamp->IsEmpty() ? UnitLoadedState->Name : UnitNotLoadedState->Name, true);
        }
    }
}

void UnitConverter::StartProgressRingWithDelay()
{
    HideProgressRing();

    TimeSpan delay{};
    delay.Duration = DURATION_500_MS;

    m_delayTimer = ref new DispatcherTimer();
    m_delayTimer->Interval = delay;
    m_delayTimer->Tick += ref new EventHandler<Object ^>(this, &UnitConverter::OnDelayTimerTick);

    m_delayTimer->Start();
}

void UnitConverter::OnDelayTimerTick(Object ^ /*sender*/, Object ^ /*e*/)
{
    CurrencyLoadingProgressRing->IsActive = true;
    m_delayTimer->Stop();
}

void UnitConverter::HideProgressRing()
{
    if (m_delayTimer != nullptr)
    {
        m_delayTimer->Stop();
    }

    CurrencyLoadingProgressRing->IsActive = false;
}

// The function will make sure the UI will have enough space to display supplementary results and currency information
void CalculatorApp::UnitConverter::SupplementaryResultsPanelInGrid_SizeChanged(Platform::Object ^ sender, Windows::UI::Xaml::SizeChangedEventArgs ^ e)
{
    // We add 0.01 to be sure to not create an infinite loop with SizeChanged events cascading due to float approximation
    RowDltrUnits->MinHeight = max(48.0, e->NewSize.Height + 0.01);
}

void CalculatorApp::UnitConverter::OnVisualStateChanged(Platform::Object ^ sender, Windows::UI::Xaml::VisualStateChangedEventArgs ^ e)
{
    auto mode = NavCategory::Deserialize(Model->CurrentCategory->GetModelCategory().id);
    TraceLogger::GetInstance()->LogVisualStateChanged(mode, e->NewState->Name, false);
}