using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.UI.Xaml;
using Windows.UI.StartScreen;
 
namespace Microsoft.Maui.ApplicationModel
{
	class AppActionsImplementation : IAppActions, IPlatformAppActions
	{
		public bool IsSupported => true;
 
		public async Task<IEnumerable<AppAction>> GetAsync()
		{
			// Load existing items
			var jumpList = await JumpList.LoadCurrentAsync();
 
			var actions = new List<AppAction>();
			foreach (var item in jumpList.Items)
				actions.Add(item.ToAction());
 
			return actions;
		}
 
		public async Task SetAsync(IEnumerable<AppAction> actions)
		{
			// Load existing items
			var jumpList = await JumpList.LoadCurrentAsync();
 
			// Set as custom, not system or frequent
			jumpList.SystemGroupKind = JumpListSystemGroupKind.None;
 
			// Clear the existing items
			jumpList.Items.Clear();
 
			// Add each action
			foreach (var a in actions)
				jumpList.Items.Add(a.ToJumpListItem());
 
			// Save the changes
			await jumpList.SaveAsync();
		}
 
		public event EventHandler<AppActionEventArgs> AppActionActivated;
 
		public async Task OnLaunched(LaunchActivatedEventArgs e)
		{
			var args = e?.Arguments;
#if !WINDOWS_UWP
			if (string.IsNullOrEmpty(args))
			{
				var cliArgs = Environment.GetCommandLineArgs();
				if (cliArgs?.Length > 1)
					args = cliArgs[1];
			}
#endif
 
			if (args?.StartsWith(AppActionsExtensions.AppActionPrefix) ?? false)
			{
				var id = AppActionsExtensions.ArgumentsToId(args);
 
				if (!string.IsNullOrEmpty(id))
				{
					var actions = await GetAsync();
					var appAction = actions.FirstOrDefault(a => a.Id == id);
 
					if (appAction != null)
						AppActionActivated?.Invoke(null, new AppActionEventArgs(appAction));
				}
			}
		}
	}
 
	static partial class AppActionsExtensions
	{
		internal const string AppActionPrefix = "XE_APP_ACTIONS-";
 
		internal const string iconDirectory = "";
		internal const string iconExtension = ".png";
 
		internal static string ArgumentsToId(this string arguments)
		{
			if (arguments?.StartsWith(AppActionPrefix) ?? false)
				return Encoding.Default.GetString(Convert.FromBase64String(arguments.Substring(AppActionPrefix.Length)));
 
			return default;
		}
 
		internal static AppAction ToAction(this JumpListItem item)
			=> new AppAction(ArgumentsToId(item.Arguments), item.DisplayName, item.Description);
 
		internal static JumpListItem ToJumpListItem(this AppAction action)
		{
			var id = AppActionPrefix + Convert.ToBase64String(Encoding.Default.GetBytes(action.Id));
			var item = JumpListItem.CreateWithArguments(id, action.Title);
 
			if (!string.IsNullOrEmpty(action.Subtitle))
				item.Description = action.Subtitle;
 
			if (!string.IsNullOrEmpty(action.Icon))
			{
				var dir = iconDirectory?.Trim('/', '\\').Replace('\\', '/');
				if (!string.IsNullOrEmpty(dir))
					dir += "/";
 
				var ext = iconExtension;
				if (!string.IsNullOrEmpty(ext) && !ext.StartsWith("."))
					ext = "." + ext;
 
				item.Logo = new Uri($"ms-appx:///{dir}{action.Icon}{ext}");
			}
 
			return item;
		}
	}
}