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

#pragma once

#include "Utils.h"

namespace CalculatorApp
{
    namespace Common
    {
        namespace LocalizationServiceProperties
        {
            static constexpr std::wstring_view DefaultCurrencyCode{ L"USD" };
        }

    public
        enum class LanguageFontType
        {
            UIText,
            UICaption,
        };

    public
        ref class LocalizationService sealed
        {
        public:
            DEPENDENCY_PROPERTY_OWNER(LocalizationService);

            DEPENDENCY_PROPERTY_ATTACHED_WITH_DEFAULT_AND_CALLBACK(LanguageFontType, FontType, LanguageFontType::UIText);
            DEPENDENCY_PROPERTY_ATTACHED_WITH_CALLBACK(double, FontSize);

            internal : static LocalizationService ^ GetInstance();

            Windows::UI::Xaml::FlowDirection GetFlowDirection();
            bool IsRtlLayout();
            bool GetOverrideFontApiValues();
            Platform::String ^ GetLanguage();
            Windows::UI::Xaml::Media::FontFamily ^ GetLanguageFontFamilyForType(LanguageFontType fontType);
            Platform::String ^ GetFontFamilyOverride();
            Windows::UI::Text::FontWeight GetFontWeightOverride();
            double GetFontScaleFactorOverride(LanguageFontType fontType);

            static Windows::Globalization::NumberFormatting::DecimalFormatter ^ GetRegionalSettingsAwareDecimalFormatter();
            static Windows::Globalization::DateTimeFormatting::DateTimeFormatter ^ GetRegionalSettingsAwareDateTimeFormatter(_In_ Platform::String ^ format);
            static Windows::Globalization::DateTimeFormatting::DateTimeFormatter
                ^ GetRegionalSettingsAwareDateTimeFormatter(
                    _In_ Platform::String ^ format,
                    _In_ Platform::String ^ calendarIdentifier,
                    _In_ Platform::String ^ clockIdentifier);

            static Windows::Globalization::NumberFormatting::CurrencyFormatter ^ GetRegionalSettingsAwareCurrencyFormatter();

            static Platform::String ^ GetNarratorReadableToken(Platform::String ^ rawToken);
            static Platform::String ^ GetNarratorReadableString(Platform::String ^ rawString);

        private:
            Windows::Globalization::Fonts::LanguageFont ^ GetLanguageFont(LanguageFontType fontType);
            Windows::UI::Text::FontWeight ParseFontWeight(Platform::String ^ fontWeight);

            static Windows::Foundation::Collections::IIterable<Platform::String ^> ^ GetLanguageIdentifiers();

            // Attached property callbacks
            static void OnFontTypePropertyChanged(Windows::UI::Xaml::DependencyObject ^ target, LanguageFontType oldValue, LanguageFontType newValue);
            static void OnFontWeightPropertyChanged(
                Windows::UI::Xaml::DependencyObject ^ target,
                Windows::UI::Text::FontWeight oldValue,
                Windows::UI::Text::FontWeight newValue);
            static void OnFontSizePropertyChanged(Windows::UI::Xaml::DependencyObject ^ target, double oldValue, double newValue);

            static void UpdateFontFamilyAndSize(Windows::UI::Xaml::DependencyObject ^ target);

            static std::unordered_map<std::wstring, std::wstring> GetTokenToReadableNameMap();

        private:
            LocalizationService();

            static LocalizationService ^ s_singletonInstance;

            Windows::Globalization::Fonts::LanguageFontGroup ^ m_fontGroup;
            Platform::String ^ m_language;
            Windows::UI::Xaml::FlowDirection m_flowDirection;
            bool m_overrideFontApiValues;
            Platform::String ^ m_fontFamilyOverride;
            Windows::UI::Text::FontWeight m_fontWeightOverride;
            double m_uiTextFontScaleFactorOverride;
            double m_uiCaptionFontScaleFactorOverride;
        };

    }
}