using Annulus;
using Azimuth;
using System;

namespace Glass.Testbed
{
    public class CheckboxTestCase : TestCase
    {
        private static readonly Vector BoxSize = Vector.Max(
            UiPacksheetMaterials.CheckboxUnchecked.PreferredSize(Constraints.Unbounded),
            UiPacksheetMaterials.CheckboxChecked.PreferredSize(Constraints.Unbounded));

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

        /// <summary>
        /// The row size a labeled checkbox needs to show caption beside the indicator without truncating it.
        /// </summary>
        private static Vector LabeledRowSize(string caption)
        {
            Vector labelSize = Widgets.FieldText(caption).PreferredSize(Constraints.Unbounded);
            return new Vector(BoxSize.X + labelSize.X, Math.Max(BoxSize.Y, labelSize.Y));
        }

        private void AddBareCheckbox(Rect bounds, bool startChecked, bool enabled)
        {
            Checkbox box = new Checkbox
            {
                UncheckedMaterial = UiPacksheetMaterials.CheckboxUnchecked,
                CheckedMaterial = UiPacksheetMaterials.CheckboxChecked,
                Checked = startChecked,
                Enabled = enabled,
                Bounds = bounds,
                DebugName = "bare checkbox",
            };

            Add(box);
        }

        private void AddLabeledCheckbox(Rect bounds, string caption, Anchor indicatorAnchor = Anchor.Left)
        {
            Checkbox box = new Checkbox
            {
                UncheckedMaterial = UiPacksheetMaterials.CheckboxUnchecked,
                CheckedMaterial = UiPacksheetMaterials.CheckboxChecked,
                IndicatorAnchor = indicatorAnchor,
                Bounds = bounds,
                DebugName = "labeled checkbox",
            };

            // The label fills the space the indicator leaves, and the whole control is one hit target.
            Panel label = Widgets.FieldText(caption)
                .BuildControl(Constraints.Tight(box.CanvasRect.Size), out TextOverflow? truncation);
            label.DebugName = $"{caption} label";
            box.CanvasChildren.Add(label);

            if (truncation != null)
            {
                box.Tooltip = Widgets.Tooltip(caption);
            }

            Add(box);
        }

        protected override void Populate()
        {
            AddCaption("Checkbox is the box graphic only — click to toggle");
            Rect bareRow = ContentAggregator.NewRow(BoxSize.Y);
            AddBareCheckbox(bareRow.NewCol(BoxSize.X, margin: Gutter), startChecked: false, enabled: true);
            AddBareCheckbox(bareRow.NewCol(BoxSize.X, margin: Gutter), startChecked: true, enabled: true);

            AddCaption("Disabled, unchecked and checked");
            Rect disabledRow = ContentAggregator.NewRow(BoxSize.Y);
            AddBareCheckbox(disabledRow.NewCol(BoxSize.X, margin: Gutter), startChecked: false, enabled: false);
            AddBareCheckbox(disabledRow.NewCol(BoxSize.X, margin: Gutter), startChecked: true, enabled: false);

            AddCaption("Labelled: one control, the label fills the space the indicator leaves");
            const string leftCaption = "Toggle me from the text too";
            Vector leftSize = LabeledRowSize(leftCaption);
            Rect leftRow = ContentAggregator.NewRow(leftSize.Y);
            AddLabeledCheckbox(leftRow.NewCol(leftSize.X), leftCaption);

            const string rightCaption = "Indicator on the right instead";
            Vector rightSize = LabeledRowSize(rightCaption);
            Rect rightRow = ContentAggregator.NewRow(rightSize.Y);
            AddLabeledCheckbox(rightRow.NewCol(rightSize.X), rightCaption, Anchor.Right);

            const string topCaption = "Indicator anchored to the top";
            Vector topLabelSize = Widgets.FieldText(topCaption).PreferredSize(Constraints.Unbounded);
            Rect topRow = ContentAggregator.NewRow(BoxSize.Y + topLabelSize.Y);
            AddLabeledCheckbox(topRow.NewCol(Math.Max(BoxSize.X, topLabelSize.X)), topCaption, Anchor.Top);

            // Narrower than the caption below on purpose, to demonstrate truncation — reuses leftSize, sized to a
            // much shorter caption, rather than a size derived from this one.
            AddCaption("A caption too long for its row truncates and gains a tooltip");
            Rect narrowRow = ContentAggregator.NewRow(leftSize.Y);
            AddLabeledCheckbox(narrowRow.NewCol(leftSize.X),
                "This caption is deliberately much wider than the row it has been given to sit in");
        }
    }
}