using Annulus;
using Azimuth;
using System.Globalization;

namespace Glass.Testbed.TestCases.Controls
{
    /// <summary>
    /// Sliders over whole numbers, tenths and a stepped range, each with a readout, plus a vertical one and a disabled
    /// one.  Drag a thumb, click the track to page, or tab to a slider for the arrow, page, Home and End keys.
    /// </summary>
    public class SliderTestCase : TestCase
    {
        private static readonly Vector HorizontalSize = new Vector(240, 24);
        private static readonly Vector VerticalSize = new Vector(24, 160);
        private static readonly Vector ReadoutSize = new Vector(80, 24);

        private static readonly TextMaterialStyle ReadoutStyle = Widgets.SmallCaptionStyle with
        {
            VerticalAlignment = Alignment.Vertical.Center,
        };

        private Slider AddSlider(string debugName, NumberGrid grid, decimal value, Rect bounds,
            Orientation orientation = Orientation.Horizontal)
        {
            var slider = new Slider
            {
                DebugName = debugName,
                Orientation = orientation,
                SliderMaterial = orientation == Orientation.Horizontal
                    ? UiPacksheetMaterials.HorizontalSlider
                    : UiPacksheetMaterials.VerticalSlider,
                Grid = grid,
                Value = value,
                Bounds = bounds,
            };
            Add(slider);

            return slider;
        }

        private void AddReadout(Slider slider, Rect bounds)
        {
            var readout = new Label(ReadoutStyle, "") { DebugName = slider.DebugName + " value", Bounds = bounds };
            Add(readout);

            slider.OnValueChanged += value => readout.Text = value.ToString(CultureInfo.InvariantCulture);
            readout.Text = slider.Value.ToString(CultureInfo.InvariantCulture);
        }

        private void AddHorizontalRow(string debugName, NumberGrid grid, decimal value)
        {
            Rect row = ContentAggregator.NewRow(HorizontalSize.Y);
            Slider slider = AddSlider(debugName, grid, value, row.NewCol(HorizontalSize.X, margin: Gutter));
            AddReadout(slider, row.NewCol(ReadoutSize.X));
        }

        protected override void Populate()
        {
            AddCaption("Whole numbers, 0 to 100, a page click moves 10");
            AddHorizontalRow("whole", new NumberGrid { Max = 100, CoarseStep = 10 }, 40);

            AddCaption("Tenths, 0 to 1");
            AddHorizontalRow("tenths", new NumberGrid { Max = 1, Resolution = 0.1m }, 0.5m);

            AddCaption("Every 25 from 0 to 100, so the thumb snaps while it drags");
            AddHorizontalRow("stepped", new NumberGrid { Max = 100, Resolution = 25 }, 50);

            AddCaption("Disabled");
            Rect disabledRow = ContentAggregator.NewRow(HorizontalSize.Y);
            Slider disabled = AddSlider("disabled", new NumberGrid { Max = 100 }, 30,
                disabledRow.NewCol(HorizontalSize.X, margin: Gutter));
            AddReadout(disabled, disabledRow.NewCol(ReadoutSize.X));
            disabled.Enabled = false;

            AddCaption("Vertical, 0 to 10");
            Rect verticalRow = ContentAggregator.NewRow(VerticalSize.Y);
            Slider vertical = AddSlider("vertical", new NumberGrid { Max = 10, CoarseStep = 5 }, 5,
                verticalRow.NewCol(VerticalSize.X, margin: Gutter), Orientation.Vertical);
            AddReadout(vertical, verticalRow.NewCol(ReadoutSize.X));
        }
    }
}