using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Windows.Forms;
using Vanara.PInvoke;
using Vanara.Windows.Shell;

namespace Windows.Forms.App
{
	public partial class Form1 : Form
	{
		private const string appId = "Windows.Forms.App";
		private const bool systemWide = false;
		private static readonly string[] extensions = new[] { ".dmy" };
		private object currentDlg;
		private List<string> tempFiles = new List<string>();

		public Form1()
		{
			InitializeComponent();
			FillComboWithDialogs(dlgCombo);
			shellItemChangeWatcher1.Item = new ShellFolder(Shell32.KNOWNFOLDERID.FOLDERID_RecycleBinFolder);
			shellItemChangeWatcher1.EnableRaisingEvents = true;
		}

		private void ShellItemChangeWatcher1_Changed(object sender, Vanara.Windows.Shell.ShellItemChangeWatcher.ShellItemChangeEventArgs e)
		{
			foreach (var i in e.ChangedItems)
				logDisplay.AppendText($"{e.ChangeType}={i.Name}{Environment.NewLine}");
		}

		protected override void OnHandleDestroyed(EventArgs e)
		{
			shellItemChangeWatcher1.EnableRaisingEvents = false;
			base.OnHandleDestroyed(e);
		}

		private static void FillComboWithDialogs(ComboBox cb) => cb.Items.AddRange(Assembly.GetAssembly(typeof(Vanara.Windows.Forms.AccessControlEditorDialog)).GetTypes().Where(t => t.IsPublic && !t.IsNested && typeof(CommonDialog).IsAssignableFrom(t) || typeof(Form).IsAssignableFrom(t)).ToArray());

		private void button1_Click(object sender, EventArgs e)
		{
			if (currentDlg is null) return;
			try
			{
				if (currentDlg is CommonDialog c)
					c.ShowDialog();
				else if (currentDlg is Form f)
					f.ShowDialog();
			}
			catch (Exception ex)
			{
				MessageBox.Show(ex.ToString(), null, MessageBoxButtons.OK, MessageBoxIcon.Error);
			}
		}

		private void dlgCombo_SelectedIndexChanged(object sender, EventArgs e)
		{
			currentDlg = dlgCombo.SelectedItem is null ? null : Activator.CreateInstance((Type)dlgCombo.SelectedItem);
			propertyGrid1.SelectedObject = currentDlg;
		}

		private void Form1_FormClosing(object sender, FormClosingEventArgs e)
		{
			// Remove temp files
			foreach (var n in tempFiles)
				File.Delete(n);

			// Unregister app
			try { ProgId.Unregister(appId, true, systemWide); } catch { }
		}

		private void Form1_Load(object sender, EventArgs e)
		{
			// Register app
			using (var progId = ProgId.Register(appId, Text, systemWide))
			{
				progId.Verbs.Add("open", "Open", $"{Application.ExecutablePath} %1", true);
				foreach (var ext in extensions)
					progId.FileTypeAssociations.Add(ext);
			}

			// Create temp files
			var tempCount = 4;
			for (var i = 0; i < tempCount; i++)
			{
				var nfn = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), $"____File{i:D4}{extensions[0]}");
				File.WriteAllText(nfn, "dummy");
				tempFiles.Add(nfn);
			}
		}
	}
}