using System;
using System.Collections;
using System.IO;
using System.IO.Abstractions;
using System.Linq;
using System.Runtime.InteropServices;
using Terminal.Gui;
using static Terminal.Gui.OpenDialog;

namespace UICatalog.Scenarios {
	[ScenarioMetadata (Name: "FileDialog", Description: "Demonstrates how to the FileDialog class")]
	[ScenarioCategory ("Dialogs")]
	[ScenarioCategory ("Files and IO")]
	public class FileDialogExamples : Scenario {
		private CheckBox cbMustExist;
		private CheckBox cbUnicode;
		private CheckBox cbUseColors;
		private CheckBox cbCaseSensitive;
		private CheckBox cbAllowMultipleSelection;
		private CheckBox cbShowTreeBranchLines;
		private CheckBox cbAlwaysTableShowHeaders;
		private CheckBox cbDrivesOnlyInTree;

		private RadioGroup rgCaption;
		private RadioGroup rgOpenMode;
		private RadioGroup rgAllowedTypes;

		public override void Setup ()
		{
			var y = 0;
			var x = 1;

			cbMustExist = new CheckBox ("Must Exist") { Checked = true, Y = y++, X = x };
			Win.Add (cbMustExist);

			cbUnicode = new CheckBox ("UseUnicode") { Checked = FileDialogStyle.DefaultUseUnicodeCharacters, Y = y++, X = x };
			Win.Add (cbUnicode);

			cbUseColors = new CheckBox ("Use Colors") { Checked = FileDialogStyle.DefaultUseColors, Y = y++, X = x };
			Win.Add (cbUseColors);

			cbCaseSensitive = new CheckBox ("Case Sensitive Search") { Checked = false, Y = y++, X = x };
			Win.Add (cbCaseSensitive);

			cbAllowMultipleSelection = new CheckBox ("Multiple") { Checked = false, Y = y++, X = x };
			Win.Add (cbAllowMultipleSelection);

			cbShowTreeBranchLines = new CheckBox ("Tree Branch Lines") { Checked = true, Y = y++, X = x };
			Win.Add (cbShowTreeBranchLines);

			cbAlwaysTableShowHeaders = new CheckBox ("Always Show Headers") { Checked = true, Y = y++, X = x };
			Win.Add (cbAlwaysTableShowHeaders);

			cbDrivesOnlyInTree = new CheckBox ("Only Show Drives") { Checked = false, Y = y++, X = x };
			Win.Add (cbDrivesOnlyInTree);

			y = 0;
			x = 24;

			Win.Add (new LineView (Orientation.Vertical) {
				X = x++,
				Y = 1,
				Height = 4
			});
			Win.Add (new Label ("Caption") { X = x++, Y = y++ });

			rgCaption = new RadioGroup { X = x, Y = y };
			rgCaption.RadioLabels = new NStack.ustring [] { "Ok", "Open", "Save" };
			Win.Add (rgCaption);

			y = 0;
			x = 37;

			Win.Add (new LineView (Orientation.Vertical) {
				X = x++,
				Y = 1,
				Height = 4
			});
			Win.Add (new Label ("OpenMode") { X = x++, Y = y++ });

			rgOpenMode = new RadioGroup { X = x, Y = y };
			rgOpenMode.RadioLabels = new NStack.ustring [] { "File", "Directory", "Mixed" };
			Win.Add (rgOpenMode);

			y = 5;
			x = 24;

			Win.Add (new LineView (Orientation.Vertical) {
				X = x++,
				Y = y + 1,
				Height = 4
			});
			Win.Add (new Label ("Allowed") { X = x++, Y = y++ });

			rgAllowedTypes = new RadioGroup { X = x, Y = y };
			rgAllowedTypes.RadioLabels = new NStack.ustring [] { "Any", "Csv (Recommended)", "Csv (Strict)" };
			Win.Add (rgAllowedTypes);

			var btn = new Button ($"Run Dialog") {
				X = 1,
				Y = 9
			};

			SetupHandler (btn);
			Win.Add (btn);
		}

		private void SetupHandler (Button btn)
		{
			btn.Clicked += (s,e) => {
				try
				{
					CreateDialog();
				}	
				catch(Exception ex)
				{
					MessageBox.ErrorQuery("Error",ex.ToString(),"Ok");

				}
			};
		}

		private void CreateDialog ()
		{
			
				var fd = new FileDialog () {
					OpenMode = Enum.Parse<OpenMode> (
						rgOpenMode.RadioLabels [rgOpenMode.SelectedItem].ToString ()),
					MustExist = cbMustExist.Checked ?? false,
					AllowsMultipleSelection = cbAllowMultipleSelection.Checked ?? false,
				};

				fd.Style.OkButtonText = rgCaption.RadioLabels [rgCaption.SelectedItem].ToString ();

				// If Save style dialog then give them an overwrite prompt
				if(rgCaption.SelectedItem == 2) {
					fd.FilesSelected += ConfirmOverwrite;
				}

				fd.Style.UseUnicodeCharacters = cbUnicode.Checked ?? false;

				if (cbCaseSensitive.Checked ?? false) {

					fd.SearchMatcher = new CaseSensitiveSearchMatcher ();
				}

				fd.Style.UseColors = cbUseColors.Checked ?? false;

				fd.Style.TreeStyle.ShowBranchLines = cbShowTreeBranchLines.Checked ?? false;
				fd.Style.TableStyle.AlwaysShowHeaders = cbAlwaysTableShowHeaders.Checked ?? false;

				if (cbDrivesOnlyInTree.Checked ?? false) {
					fd.Style.TreeRootGetter = () => {
						return System.Environment.GetLogicalDrives ()
						.Select (d => new FileDialogRootTreeNode (d, new DirectoryInfo (d)));
					};
				}

				if (rgAllowedTypes.SelectedItem > 0) {
					fd.AllowedTypes.Add (new AllowedType ("Data File", ".csv", ".tsv"));

					if (rgAllowedTypes.SelectedItem == 1) {
						fd.AllowedTypes.Insert (1, new AllowedTypeAny ());
					}

				}

				Application.Run (fd);

				if (fd.Canceled) {
					MessageBox.Query (
						"Canceled",
						"You canceled navigation and did not pick anything",
					"Ok");
				} else if (cbAllowMultipleSelection.Checked ?? false) {
					MessageBox.Query (
						"Chosen!",
						"You chose:" + Environment.NewLine +
						string.Join (Environment.NewLine, fd.MultiSelected.Select (m => m)),
						"Ok");
				} else {
					MessageBox.Query (
						"Chosen!",
						"You chose:" + Environment.NewLine + fd.Path,
						"Ok");
				}
		}

		private void ConfirmOverwrite (object sender, FilesSelectedEventArgs e)
		{
			if (!string.IsNullOrWhiteSpace (e.Dialog.Path)) {
				if(File.Exists(e.Dialog.Path)) {
					int result = MessageBox.Query ("Overwrite?", "File already exists", "Yes", "No");
					e.Cancel = result == 1;
				}
			}
		}

		private class CaseSensitiveSearchMatcher : ISearchMatcher {
			private string terms;

			public void Initialize (string terms)
			{
				this.terms = terms;
			}

			public bool IsMatch (IFileSystemInfo f)
			{
				return f.Name.Contains (terms, StringComparison.CurrentCulture);
			}
		}
	}
}