// 
// FileDialog.cs: File system dialogs for open and save
//
// TODO:
//   * Add directory selector
//   * Implement subclasses
//   * Figure out why message text does not show
//   * Remove the extra space when message does not show
//   * Use a line separator to show the file listing, so we can use same colors as the rest
//   * DirListView: Add mouse support

using System;
using System.Collections.Generic;
using System.Text;
using Terminal.Gui.Resources;

namespace Terminal.Gui {
	/// <summary>
	///  The <see cref="SaveDialog"/> provides an interactive dialog box for users to pick a file to 
	///  save.
	/// </summary>
	/// <remarks>
	/// <para>
	///   To use, create an instance of <see cref="SaveDialog"/>, and pass it to
	///   <see cref="Application.Run(Func{Exception, bool})"/>. This will run the dialog modally,
	///   and when this returns, the <see cref="FileName"/>property will contain the selected file name or 
	///   null if the user canceled. 
	/// </para>
	/// </remarks>
	public class SaveDialog : FileDialog {
		/// <summary>
		/// Initializes a new <see cref="SaveDialog"/>.
		/// </summary>
		public SaveDialog () : this (title: string.Empty) { }

		/// <summary>
		/// Initializes a new <see cref="SaveDialog"/>.
		/// </summary>
		/// <param name="title">The title.</param>
		/// <param name="allowedTypes">The allowed types.</param>
		public SaveDialog (string title, List<IAllowedType> allowedTypes = null)
		{
			//: base (title, prompt: Strings.fdSave, nameFieldLabel: $"{Strings.fdSaveAs}:", message: message, allowedTypes) { }
			Title = title;
			Style.OkButtonText = Strings.btnSave;

			if(allowedTypes != null) {
				AllowedTypes = allowedTypes;
			}
		}

		/// <summary>
		/// Gets the name of the file the user selected for saving, or null
		/// if the user canceled the <see cref="SaveDialog"/>.
		/// </summary>
		/// <value>The name of the file.</value>
		public string FileName {
			get {
				if (Canceled)
					return null;

				return Path;
			}
		}

		/// <summary>
		/// Gets the default title for the <see cref="SaveDialog"/>.
		/// </summary>
		/// <returns></returns>
		protected override string GetDefaultTitle ()
		{
			List<string> titleParts = new () {
				Strings.fdSave
			};
			if (MustExist) {
				titleParts.Add (Strings.fdExisting);
			}
			switch (OpenMode) {
			case OpenMode.File:
				titleParts.Add (Strings.fdFile);
				break;
			case OpenMode.Directory:
				titleParts.Add (Strings.fdDirectory);
				break;
			}
			return string.Join (' ', titleParts);
		}
	}
}