using Annulus;
using Azimuth;
using System.Collections.Generic;

namespace Glass.Testbed
{
    /// <summary>
    /// Switches who draws the mouse cursor, so the three answers can be compared against each other live.
    /// </summary>
    public class CursorTestCase : TestCase
    {
        private static readonly Vector ButtonSize = new Vector(200, 56);

        private readonly World world;
        private readonly Dictionary<CursorMode, Button> buttons = new Dictionary<CursorMode, Button>();

        public CursorTestCase(string name, World world) : base(name)
        {
            this.world = world;
        }

        /// <summary>
        /// Stands in for a radio group the same way the tab strip does: the chosen mode wears yellow.
        /// </summary>
        private void ShowChoice()
        {
            foreach (KeyValuePair<CursorMode, Button> button in buttons)
            {
                button.Value.ButtonMaterial = button.Key == world.CursorMode
                    ? UiPacksheetMaterials.YellowButton
                    : UiPacksheetMaterials.Button;
            }
        }

        // The row is consumed a column at a time, so it has to be the caller's rect rather than a copy of it.
        private void AddChoice(ref Rect row, CursorMode mode, string label)
        {
            CursorMode chooseMe = mode;

            Button choice = new Panel { Material = Widgets.ButtonLabel(label) }.FillParent(new Button
            {
                DebugName = $"{mode} cursor",
                ButtonMaterial = UiPacksheetMaterials.Button,
                Bounds = row.NewCol(ButtonSize.X, margin: Gutter),
            });

            choice.OnClick += delegate (in MouseState _, MouseButtonFlags __)
            {
                world.CursorMode = chooseMe;
                ShowChoice();
            };

            Add(choice);
            buttons[mode] = choice;
        }

        protected override void Populate()
        {
            AddCaption("System leaves the pointer alone; hardware hands the art to the OS; software draws it here");
            AddCaption("Software lands last in the frame, so nothing can cover it, but it trails by a tick");

            Rect row = ContentAggregator.NewRow(ButtonSize.Y);

            AddChoice(ref row, CursorMode.System, "System");
            AddChoice(ref row, CursorMode.Hardware, "Hardware");
            AddChoice(ref row, CursorMode.Software, "Software");
        }

        /// <summary>
        /// The mode outlives the case being hidden, so the buttons are re-marked rather than reset.
        /// </summary>
        protected override void Setup()
        {
            ShowChoice();
        }
    }
}