using Annulus;
using Azimuth;

namespace Glass.Testbed
{
    /// <summary>
    /// Two independent columns wired up with RadioGroup.FromChildrenOf, plus a button that clears one of them.
    /// </summary>
    public class RadioButtonTestCase : TestCase
    {
        private static readonly Vector LabeledRowSize = new Vector(220, 36);

        public RadioButtonTestCase(string name) : base(name)
        {
        }

        /// <summary>
        /// Lays out one RadioButton per label in a column, then hands the column to RadioGroup.FromChildrenOf so
        /// this group and any sibling column stay independent of each other.
        /// </summary>
        private RadioGroup AddRadioGroupColumn(string caption, string[] labels, int? preCheckedIndex = null)
        {
            AddCaption(caption);

            var column = NewChild<Panel>();
            column.Material = Material.Invisible;

            var rows = new RectAggregator(
                Rect.FromPositionAndSize(Vector.Zero, new Vector(LabeledRowSize.X, 0)), new Vector(0, Gutter));

            for (int index = 0; index < labels.Length; ++index)
            {
                string label = labels[index];
                Rect rowSlot = rows.NewRow(LabeledRowSize.Y);

                var radioButton = new RadioButton
                {
                    UncheckedMaterial = UiPacksheetMaterials.RadioButtonUnchecked,
                    CheckedMaterial = UiPacksheetMaterials.RadioButtonChecked,
                    Bounds = rowSlot,
                    Checked = index == preCheckedIndex,
                    DebugName = $"{label} radio button",
                };

                Panel fieldLabel = Widgets.FieldText(label)
                    .BuildControl(Constraints.Tight(radioButton.CanvasRect.Size), out TextOverflow? truncation);
                fieldLabel.DebugName = $"{label} label";
                radioButton.CanvasChildren.Add(fieldLabel);

                if (truncation != null)
                {
                    radioButton.Tooltip = Widgets.Tooltip(label);
                }

                column.CanvasChildren.Add(radioButton);
            }

            column.Bounds = Rect.FromPositionAndSize(
                ContentAggregator.NewRow(rows.Rect.Height).TopLeft, rows.Rect.Size);

            return RadioGroup.FromChildrenOf(column);
        }

        protected override void Populate()
        {
            AddRadioGroupColumn("First group — one option starts pre-checked",
                new[] { "Small", "Medium", "Large" }, preCheckedIndex: 0);

            RadioGroup units = AddRadioGroupColumn(
                "Second group — independent of the first, nothing selected by default",
                new[] { "Metric", "Imperial" });

            AddCaption("Clearing a group returns it to no selection");
            Button clearButton = Widgets.ButtonLabel("Clear second group")
                .BuildControl(Constraints.Unbounded)
                .WrapIn(UiPacksheetMaterials.Button);
            clearButton.DebugName = "clear second group button";
            clearButton.OnClick += delegate (in MouseState _, MouseButtonFlags __) { units.Clear(); };
            clearButton.Bounds = Rect.FromPositionAndSize(
                ContentAggregator.NewRow(clearButton.Bounds.Height).TopLeft, clearButton.Bounds.Size);
            Add(clearButton);
        }
    }
}