using Xunit;
using Terminal.Gui;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Text.Json;
using static Terminal.Gui.ConfigurationManager;

namespace Terminal.Gui.ConfigurationTests {
	public class AppScopeTests {
		public static readonly JsonSerializerOptions _jsonOptions = new () {
			Converters = {
				//new AttributeJsonConverter (),
				//new ColorJsonConverter ()
				}
		};

		public class AppSettingsTestClass {
			[SerializableConfigurationProperty (Scope = typeof (AppScope))]
			public static bool? TestProperty { get; set; } = null;
		}

		[Fact]
		public void TestNullable ()
		{
			AppSettingsTestClass.TestProperty = null;
			Assert.Null (AppSettingsTestClass.TestProperty);

			ConfigurationManager.Initialize ();
			ConfigurationManager.GetHardCodedDefaults ();
			ConfigurationManager.Apply ();
			Assert.Null (AppSettingsTestClass.TestProperty);

			AppSettingsTestClass.TestProperty = true;
			ConfigurationManager.Initialize ();
			ConfigurationManager.GetHardCodedDefaults ();
			Assert.NotNull (AppSettingsTestClass.TestProperty);
			ConfigurationManager.Apply ();
			Assert.NotNull (AppSettingsTestClass.TestProperty);
		}

		[Fact, AutoInitShutdown]
		public void Apply_ShouldApplyUpdatedProperties ()
		{
			ConfigurationManager.Reset ();
			Assert.Null (AppSettingsTestClass.TestProperty);
			Assert.NotEmpty (ConfigurationManager.AppSettings);
			Assert.Null (ConfigurationManager.AppSettings ["AppSettingsTestClass.TestProperty"].PropertyValue);
			
			AppSettingsTestClass.TestProperty = true;
			ConfigurationManager.Reset ();
			Assert.True (AppSettingsTestClass.TestProperty);
			Assert.NotEmpty (ConfigurationManager.AppSettings);
			Assert.Null (ConfigurationManager.AppSettings ["AppSettingsTestClass.TestProperty"].PropertyValue as bool?);
			
			ConfigurationManager.AppSettings ["AppSettingsTestClass.TestProperty"].PropertyValue = false;
			Assert.False (ConfigurationManager.AppSettings ["AppSettingsTestClass.TestProperty"].PropertyValue as bool?);
			
			// ConfigurationManager.Settings should NOT apply theme settings
			ConfigurationManager.Settings.Apply ();
			Assert.True (AppSettingsTestClass.TestProperty);

			// ConfigurationManager.Themes should NOT apply theme settings
			ConfigurationManager.ThemeManager.Themes! [ThemeManager.SelectedTheme]!.Apply ();
			Assert.True (AppSettingsTestClass.TestProperty);

			// ConfigurationManager.AppSettings should NOT apply theme settings
			ConfigurationManager.AppSettings.Apply ();
			Assert.False (AppSettingsTestClass.TestProperty);

		}

		[Fact]
		public void TestSerialize_RoundTrip ()
		{
			ConfigurationManager.Reset ();

			var initial = ConfigurationManager.AppSettings;

			var serialized = JsonSerializer.Serialize<AppScope> (ConfigurationManager.AppSettings, _jsonOptions);
			var deserialized = JsonSerializer.Deserialize<AppScope> (serialized, _jsonOptions);

			Assert.NotEqual (initial, deserialized);
			Assert.Equal (deserialized.Count, initial.Count);
		}
	}
}