using System;
using System.Drawing;
using ComponentFramework.Core;
using ComponentFramework.Tools;
using MTV3D65;

namespace ComponentFrameworkTests.Components
{
    [AutoLoad]
    class EasingTest : Component
    {
        const int HorizontalSpacing = 15;
        const int VerticalSpacing = 30;
        int Height;
        int Width;

        readonly EasingType[] easingTypes;
        TVViewport viewport;

        public EasingTest(ICore core) : base(core)
        {
            easingTypes = Enum.GetValues(typeof(EasingType)) as EasingType[];
        }

        public override void Initialize()
        {
            viewport = Core.Engine.GetViewport();
        }

        public override void Update(TimeSpan elapsed)
        {
            Width = (viewport.GetWidth() - HorizontalSpacing * (easingTypes.Length + 1)) / easingTypes.Length;
            Height = (viewport.GetHeight() - VerticalSpacing * 4) / 3;
        }

        public override void PostDraw()
        {
            Screen2DImmediate.Action_Begin2D();
            Screen2DText.Action_BeginText(true);

            int y = Height + VerticalSpacing;
            DrawCurve(HorizontalSpacing, y, Easing.EaseIn); y += Height + VerticalSpacing;
            DrawCurve(HorizontalSpacing, y, Easing.EaseOut); y += Height + VerticalSpacing;
            DrawCurve(HorizontalSpacing, y, Easing.EaseInOut);

            Screen2DText.Action_EndText();
            Screen2DImmediate.Action_End2D();
        }

        void DrawCurve(int x, int y, Func<double, EasingType, float> easingFunction)
        {
            foreach (EasingType type in easingTypes)
            {
                Screen2DText.TextureFont_DrawText(type.ToString(), x, y, Color.White.ToArgb());
                float sLastI = 0;
                for (int i = 0; i < Width; i++)
                {
                    var sI = easingFunction((double)i / Width, type);
                    Screen2DImmediate.Draw_Line(x + (i - 1), y - sLastI * Height, x + i, y - sI * Height);
                    sLastI = sI;
                }
                x += Width + HorizontalSpacing;
            }
        }
    }
}