using System;
using System.Drawing;
using System.Numerics;
using Dashboard.Drawing;
using Dashboard.Layout;
using Dashboard.Pal;

namespace Dashboard.Controls
{
    public class Button : Control
    {
        private Vector2 _intrinsicSize = Vector2.Zero;

        public bool AutoSize { get; set; } = true;
        public string Text { get; set; } = "Click!";

        public Font Font { get; set; } = Font.Create(new FontInfo("Rec Mono Linear"));
        public float TextSize { get; set; } = 12f;
        public Brush TextBrush { get; set; } = new SolidColorBrush(Color.Black);
        public Brush ButtonBrush { get; set; } = new SolidColorBrush(Color.DarkSlateGray);

        public Vector2 Padding { get; set; } = new Vector2(4, 4);

        public event EventHandler? Clicked;

        public override Vector2 CalculateIntrinsicSize()
        {
            return _intrinsicSize + 2 * Padding;
        }

        protected void CalculateSize(DeviceContext dc)
        {
            Box2d box = dc.ExtensionRequire<ITextRenderer>().MeasureText(Font.Base, TextSize, Text);
            _intrinsicSize = box.Size;
            // Layout.Size = box.Size;
            // ClientArea = new Box2d(ClientArea.Min, ClientArea.Min + Layout.Size);
        }

        public override void OnPaint(DeviceContext dc)
        {
            base.OnPaint(dc);

            if (AutoSize)
                CalculateSize(dc);

            bool hidden = Layout.OverflowMode == OverflowMode.Hidden;
            var dcb = dc.ExtensionRequire<IDeviceContextBase>();
            if (hidden)
                dcb.PushScissor(ClientArea);

            dcb.PushTransforms(Matrix4x4.CreateTranslation(ClientArea.Left, ClientArea.Top, 0));

            var imm = dc.ExtensionRequire<IImmediateMode>();
            Color color = (ButtonBrush as SolidColorBrush)?.Color ?? Color.Black;
            Vector4 colorVector = new Vector4(color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f);
            imm.Rectangle(ClientArea, 0, colorVector);

            var text = dc.ExtensionRequire<ITextRenderer>();
            color = (TextBrush as SolidColorBrush)?.Color ?? Color.Black;
            colorVector = new Vector4(color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f);
            text.DrawText(Vector2.Zero, colorVector, TextSize, Font.Base, Text);

            if (hidden)
                dcb.PopScissor();

            dcb.PopTransforms();
        }
    }
}