using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Text;

namespace Veldrid.Common.Axis
{
    public sealed class LineAxis : BaseVeldridRender,IZoomRender
    {
        public float HScale { get; set; } = 1;
        public float VScale { get; set; } = 1;
        public float HOffset { get; set; }
        public float VOffset { get; set; }
        public bool ZoomEnbled { get; set; } = true;
        public Vector2 WindowScale { get; set; } = Vector2.One;

        struct ProjView
        {
            public Matrix4x4 Proj;
            public Matrix4x4 View;
        }
        private ProjView projView;
        Pipeline borderpipeline;
        Pipeline pipeline;
        DeviceBuffer plotInfoBuffer;
        DeviceBuffer projViewBuffer;
        DeviceBuffer dataBuffer;
        ResourceLayout infoLayout;
        ResourceSet infoSet;
        Shader[] shaders;
        MutiText text;
        private object locker = new object();
        public LineAxis(VeldridContent control) : base(control)
        {
            Margin = new Padding(38, 8, 8, 18);
            text = new MutiText(control,true,true);
            text.CreateResources();
            text.FontSize = 10;
            text.TextInfos = Enumerable.Range(0, 22).Select(x => new TextInfo()).ToArray();
            text.Margin = new Padding(40,10,10,20);
        }
        internal override void DisposeResources()
        {
            base.DisposeResources();
            borderpipeline?.Dispose();
            pipeline?.Dispose();
            plotInfoBuffer?.Dispose();
            projViewBuffer?.Dispose();
            dataBuffer?.Dispose();
            infoLayout?.Dispose();
            infoSet?.Dispose();
            text?.DisposeResources();
        }
        internal override void CreateResources()
        {
            base.CreateResources();
            Vector2[] positon = new Vector2[5 + 44];
            positon[0] = new Vector2(Range.MinX, Range.MaxY);
            positon[1] = new Vector2(Range.MaxX, Range.MaxY);
            positon[2] = new Vector2(Range.MaxX, Range.MinY);
            positon[3] = new Vector2(Range.MinX, Range.MinY);
            positon[4] = positon[0];
            for (int i = 0; i < 11; i++)
            {
                positon[5 + i * 2] = new Vector2(Range.MinX + Range.XLenght / 10 * i, Range.MinY);
                positon[5 + i * 2 + 1] = new Vector2(Range.MinX + Range.XLenght / 10 * i, Range.MaxY);
                positon[5 + i * 2 + 22] = new Vector2(Range.MinX, Range.MinY + Range.YLenght / 10 * i);
                positon[5 + i * 2 + 1 + 22] = new Vector2(Range.MaxX, Range.MinY + Range.YLenght / 10 * i);
            }
            for (int i = 0; i < 11; i++)
            {
                text.TextInfos[i].Color = RgbaFloat.White;
                text.TextInfos[i].HorizontalAlignment = HorizontalAlignment.Center;
                text.TextInfos[i].VerticalAlignment = VerticalAlignment.Top;
                text.TextInfos[i].Local = new PointF(Range.MinX + i * (Range.XLenght / 10), Range.MinY);

                text.TextInfos[i + 11].Color = RgbaFloat.White;
                text.TextInfos[i + 11].HorizontalAlignment = HorizontalAlignment.Right;
                text.TextInfos[i + 11].VerticalAlignment = VerticalAlignment.Center;
                text.TextInfos[i + 11].Local = new PointF(Range.MinX-40, Range.MinY + i * (Range.YLenght / 10));
                text.TextInfos[i + 11].Text = i.ToString();
            }
            dataBuffer = ResourceFactory.CreateBuffer(new BufferDescription((uint)(Unsafe.SizeOf<Vector2>() * positon.Length), BufferUsage.VertexBuffer));
            GraphicsDevice.UpdateBuffer(dataBuffer, 0, positon);
            projViewBuffer = ResourceFactory.CreateBuffer(new BufferDescription((uint)Unsafe.SizeOf<ProjView>(), BufferUsage.UniformBuffer));
            plotInfoBuffer = ResourceFactory.CreateBuffer(new BufferDescription((uint)Unsafe.SizeOf<Vector4>() * 2, BufferUsage.UniformBuffer));
            GraphicsDevice.UpdateBuffer(plotInfoBuffer, 0, RgbaFloat.White);
            infoLayout = ResourceFactory.CreateResourceLayout(new ResourceLayoutDescription(
                new ResourceLayoutElementDescription("InfoBuffer", ResourceKind.UniformBuffer, ShaderStages.Vertex),
                new ResourceLayoutElementDescription("ProjView", ResourceKind.UniformBuffer, ShaderStages.Vertex)));
            infoSet = ResourceFactory.CreateResourceSet(new ResourceSetDescription(infoLayout, plotInfoBuffer, projViewBuffer));
            shaders = CreateShader("LineAxis");
            borderpipeline = CreatePipLine(PrimitiveTopology.LineStrip, infoLayout, new VertexLayoutDescription(new VertexElementDescription("In_Position", VertexElementFormat.Float2, VertexElementSemantic.TextureCoordinate)), shaders);
            pipeline = CreatePipLine(PrimitiveTopology.LineList, infoLayout, new VertexLayoutDescription(new VertexElementDescription("In_Position", VertexElementFormat.Float2, VertexElementSemantic.TextureCoordinate)), shaders);
        }
        public float LoopTime;
        public ulong TotalCount;
        public uint PlotDataLenght;
        private string GetTimeString(float time)
        {
            int s = (int)(time % 60);
            int m = (int)(time/60 % 60);
            int h = (int)(time / 3600);
            return string.Format("{0:D2}:{1:D2}:{2:D2}", h, m, s);
        }
        internal override void DrawData()
        {
            lock (locker)
            {
                float intert = Range.XLenght / PlotDataLenght;
                var total = TotalCount - HOffset / (MainSwapchainBuffer.Width/WindowScale.X) * TotalCount;
                float offset = (total * intert) % (Range.YLenght / 10);
                if (TotalCount <= PlotDataLenght) offset = 0;
                float totaltime = LoopTime * total / 1000/HScale;
                float plotime = LoopTime * PlotDataLenght / 1000 / 10/HScale;
                float maxtime = MathF.Ceiling(total / (PlotDataLenght / 10f)) * plotime;
                float mintime = maxtime - plotime * 11;

                base.DrawData();
                projView.Proj = base.OrthographicMatrix;
                projView.View = GetLineMatrix();
                CommandList.SetFramebuffer(MainSwapchainBuffer);
                CommandList.UpdateBuffer(projViewBuffer, 0, projView);

                CommandList.SetPipeline(pipeline);
                CommandList.UpdateBuffer(plotInfoBuffer, 0, new RgbaFloat(0.5f,0.5f,0.5f,1));
                CommandList.UpdateBuffer(plotInfoBuffer, (uint)Unsafe.SizeOf<Vector4>(), 0);
                CommandList.SetVertexBuffer(0, dataBuffer);
                CommandList.SetGraphicsResourceSet(0, infoSet);
                CommandList.Draw(22, 1, 5+22, 0);
                CommandList.UpdateBuffer(plotInfoBuffer, (uint)Unsafe.SizeOf<Vector4>(), offset);
                CommandList.Draw(22, 1, 5, 0);

                CommandList.SetPipeline(borderpipeline);
                CommandList.UpdateBuffer(plotInfoBuffer, 0, RgbaFloat.White);
                CommandList.UpdateBuffer(plotInfoBuffer, (uint)Unsafe.SizeOf<Vector4>(), 0f);
                CommandList.SetVertexBuffer(0, dataBuffer);
                CommandList.SetGraphicsResourceSet(0, infoSet);

                CommandList.Draw(5);
                CommandList.SetFramebuffer(MainSwapchainBuffer);
                float tempoffset = (VOffset * VScale) / Rectangle.Height * 10 * Range.YLenght + Range.MinY;
                for (int i = 0; i < 11; i++)
                {
                    text.TextInfos[i].BackColor = RgbaFloat.Clear;
                    text.TextInfos[i].Local = new PointF(Range.XLenght / 10 * i - offset, text.TextInfos[i].Local.Y);
                    if (TotalCount <= PlotDataLenght)
                    {
                        text.TextInfos[i].Text = GetTimeString(i * plotime);
                    }
                    else
                    {
                        text.TextInfos[i].Text = GetTimeString(mintime + plotime * i);
                    }
                    text.TextInfos[i + 11].Text = Tools.SiHelper.ValueChangeToSI((Range.YLenght / 10 * i+tempoffset ) / VScale,out _,out _,1);
                }
                text.DrawData();
            }
        }
        public override void Resize()
        {
            base.Resize();
            text?.Resize();
        }
    }
    public sealed class LineAxisConfig:BaseProperty
    {
        public double Start { get; set; }
        public double End { get; set; }
    }
}