using System;
using System.Linq;
using System.Text.Json.Serialization;
using NStack;
using static Terminal.Gui.ConfigurationManager;

namespace Terminal.Gui {
	/// <summary>
	/// The FrameView is a container frame that draws a frame around the contents. It is similar to
	/// a GroupBox in Windows.
	/// </summary>
	public class FrameView : View {
		/// <summary>
		/// Initializes a new instance of the <see cref="Gui.FrameView"/> class using <see cref="LayoutStyle.Absolute"/> layout.
		/// </summary>
		/// <param name="frame">Frame.</param>
		/// <param name="title">Title.</param>
		/// <param name="views">Views.</param>
		public FrameView (Rect frame, ustring title = null, View [] views = null) : base (frame)
		{
			SetInitialProperties (frame, title, views);
		}

		/// <summary>
		/// Initializes a new instance of the <see cref="Gui.FrameView"/> class using <see cref="LayoutStyle.Computed"/> layout.
		/// </summary>
		/// <param name="title">Title.</param>
		public FrameView (ustring title)
		{
			SetInitialProperties (Rect.Empty, title, null);
		}

		/// <summary>
		/// Initializes a new instance of the <see cref="Gui.FrameView"/> class using <see cref="LayoutStyle.Computed"/> layout.
		/// </summary>
		public FrameView () : this (title: string.Empty) {

		}

		/// <summary>
		/// The default <see cref="LineStyle"/> for <see cref="FrameView"/>'s border. The default is <see cref="LineStyle.Single"/>.
		/// </summary>
		/// <remarks>
		/// This property can be set in a Theme to change the default <see cref="LineStyle"/> for all <see cref="FrameView"/>s. 
		/// </remarks>
		[SerializableConfigurationProperty (Scope = typeof (ThemeScope)), JsonConverter (typeof (JsonStringEnumConverter))]
		public static LineStyle DefaultBorderStyle { get; set; } = LineStyle.Single;

		void SetInitialProperties (Rect frame, ustring title, View [] views = null)
		{
			this.Title = title;
			Border.Thickness = new Thickness (1);
			Border.BorderStyle = DefaultBorderStyle;
			//Border.ColorScheme = ColorScheme;
			Border.Data = "Border";
		}

		///<inheritdoc/>
		public override bool OnEnter (View view)
		{
			if (Subviews.Count == 0 || !Subviews.Any (subview => subview.CanFocus)) {
				Application.Driver?.SetCursorVisibility (CursorVisibility.Invisible);
			}

			return base.OnEnter (view);
		}
	}
}