#if __ANDROID_21__
using Xamarin.Forms.Platform.Android;
#endif
using System.Globalization;
using System.Threading;
using Gallery.Resources;
using Gallery.Util;
using Xamarin.Forms;

namespace Gallery.Services
{
    public class Environment
    {
        private static readonly CultureInfo DefaultCulture = new("zh-CN");

#if __ANDROID_21__
        public static void SetStatusBarColor(Color color)
        {
            if (Android.OS.Build.VERSION.SdkInt >= Android.OS.BuildVersionCodes.Lollipop)
            {
                Android.OS.Droid.MainActivity.Main.SetStatusBarColor(color.ToAndroid());
                Android.OS.Droid.MainActivity.Main.Window.DecorView.SystemUiVisibility =
                    App.CurrentTheme == Xamarin.Essentials.AppTheme.Dark ?
                    Android.Views.StatusBarVisibility.Visible :
                    (Android.Views.StatusBarVisibility)Android.Views.SystemUiFlags.LightStatusBar;
            }
        }
#endif

        public static void SetStatusBarStyle(StatusBarStyles style)
        {
#if __IOS__
            SetStatusBarStyle(ConvertStyle(style));
        }

        public static void SetStatusBarStyle(UIKit.UIStatusBarStyle style)
        {
            if (UIKit.UIApplication.SharedApplication.StatusBarStyle == style)
            {
                return;
            }
            if (style == UIKit.UIStatusBarStyle.BlackOpaque)
            {
                UIKit.UIApplication.SharedApplication.SetStatusBarHidden(true, true);
            }
            else
            {
                if (UIKit.UIApplication.SharedApplication.StatusBarHidden)
                {
                    UIKit.UIApplication.SharedApplication.SetStatusBarStyle(style, false);
                    UIKit.UIApplication.SharedApplication.SetStatusBarHidden(false, true);
                }
                else
                {
                    UIKit.UIApplication.SharedApplication.SetStatusBarStyle(style, true);
                }
            }
        }

        public static UIKit.UIStatusBarStyle ConvertStyle(StatusBarStyles style)
        {
            return style switch
            {
                StatusBarStyles.DarkText => UIKit.UIStatusBarStyle.DarkContent,
                StatusBarStyles.WhiteText => UIKit.UIStatusBarStyle.LightContent,
                StatusBarStyles.Hidden => UIKit.UIStatusBarStyle.BlackOpaque,
                _ => UIKit.UIStatusBarStyle.Default,
            };
#endif
        }

        public static void SetCultureInfo(CultureInfo ci)
        {
            Thread.CurrentThread.CurrentCulture = ci;
            Thread.CurrentThread.CurrentUICulture = ci;
#if DEBUG
            Log.Print($"CurrentCulture set: {ci.Name}");
#endif
        }

        public static CultureInfo GetCurrentCultureInfo()
        {
            string lang;

#if __IOS__
            if (Foundation.NSLocale.PreferredLanguages.Length > 0)
            {
                var pref = Foundation.NSLocale.PreferredLanguages[0];
                lang = ToDotnetLanguage(pref);
            }
            else
            {
                lang = "zh-CN";
            }
#elif __ANDROID__
            var locale = Java.Util.Locale.Default;
            lang = ToDotnetLanguage(locale.ToString().Replace('_', '-'));
#endif

            CultureInfo ci;
            var platform = new PlatformCulture(lang);
            try
            {
                ci = new CultureInfo(platform.Language);
            }
            catch (CultureNotFoundException e)
            {
                try
                {
                    var fallback = ToDotnetFallbackLanguage(platform);
                    Log.Print($"{lang} failed, trying {fallback} ({e.Message})");
                    ci = new CultureInfo(fallback);
                }
                catch (CultureNotFoundException e1)
                {
                    Log.Error("culture.get", $"{lang} couldn't be set, using 'zh-CN' ({e1.Message})");
                    ci = DefaultCulture;
                }
            }

            return ci;
        }

#if __IOS__
        private static string ToDotnetLanguage(string iOSLanguage)
        {
            //certain languages need to be converted to CultureInfo equivalent
            string netLanguage = iOSLanguage switch
            {
                // "Malaysian (Malaysia)" not supported .NET culture
                // "Malaysian (Singapore)" not supported .NET culture
                "ms-MY" or "ms-SG" => "ms", // closest supported
                // "Schwiizertüütsch (Swiss German)" not supported .NET culture
                "gsw-CH" => "de-CH", // closest supported
                // add more application-specific cases here (if required)
                // ONLY use cultures that have been tested and known to work
                _ => iOSLanguage
            };

#if DEBUG
            Log.Print($"iOS Language: {iOSLanguage}, .NET Language/Locale: {netLanguage}");
#endif
            return netLanguage;
        }
#elif __ANDROID__
        private static string ToDotnetLanguage(string androidLanguage)
        {
            //certain languages need to be converted to CultureInfo equivalent
            string netLanguage = androidLanguage switch
            {
                // "Malaysian (Brunei)" not supported .NET culture
                // "Malaysian (Malaysia)" not supported .NET culture
                // "Malaysian (Singapore)" not supported .NET culture
                "ms-BN" or "ms-MY" or "ms-SG" => "ms", // closest supported
                // "Indonesian (Indonesia)" has different code in  .NET 
                "in-ID" => "id-ID", // correct code for .NET
                // "Schwiizertüütsch (Swiss German)" not supported .NET culture
                "gsw-CH" => "de-CH", // closest supported
                // add more application-specific cases here (if required)
                // ONLY use cultures that have been tested and known to work
                _ => androidLanguage
            };

#if DEBUG
            Log.Print($"Android Language: {androidLanguage}, .NET Language/Locale: {netLanguage}");
#endif
            return netLanguage;
        }
#endif

        private static string ToDotnetFallbackLanguage(PlatformCulture platCulture)
        {
            string netLanguage = platCulture.LanguageCode switch
            {
                "pt" => "pt-PT", // fallback to Portuguese (Portugal)
                "gsw" => "de-CH", // equivalent to German (Switzerland) for this app
                // add more application-specific cases here (if required)
                // ONLY use cultures that have been tested and known to work
                _ => platCulture.LanguageCode // use the first part of the identifier (two chars, usually);
            };

#if DEBUG
            Log.Print($".NET Fallback Language/Locale: {platCulture.LanguageCode} to {netLanguage} (application-specific)");
#endif
            return netLanguage;
        }
    }

    public static class Screen
    {
        private const string StatusBarStyle = nameof(StatusBarStyle);
        private const string HomeIndicatorAutoHidden = nameof(HomeIndicatorAutoHidden);

        public static readonly BindableProperty StatusBarStyleProperty = BindableProperty.CreateAttached(StatusBarStyle, typeof(StatusBarStyles), typeof(Page), StatusBarStyles.WhiteText);
        public static StatusBarStyles GetStatusBarStyle(VisualElement page) => (StatusBarStyles)page.GetValue(StatusBarStyleProperty);
        public static void SetStatusBarStyle(VisualElement page, StatusBarStyles value) => page.SetValue(StatusBarStyleProperty, value);

        public static readonly BindableProperty HomeIndicatorAutoHiddenProperty = BindableProperty.CreateAttached(HomeIndicatorAutoHidden, typeof(bool), typeof(Shell), false);
        public static bool GetHomeIndicatorAutoHidden(VisualElement page) => (bool)page.GetValue(HomeIndicatorAutoHiddenProperty);
        public static void SetHomeIndicatorAutoHidden(VisualElement page, bool value) => page.SetValue(HomeIndicatorAutoHiddenProperty, value);
    }

    public enum StatusBarStyles
    {
        Default,
        // Will behave as normal. 
        // White text on black NavigationBar/in iOS Dark mode and 
        // Black text on white NavigationBar/in iOS Light mode
        DarkText,
        // Will switch the color of content of StatusBar to black. 
        WhiteText,
        // Will switch the color of content of StatusBar to white. 
        Hidden
        // Will hide the StatusBar
    }
}