using Sandbox;
using Socer;
using System;
using System.Collections.Generic;

public sealed partial class FootballWorldPanel
{
    [SkipHotload] static Model sharedTechnicalSurface;
    [SkipHotload] static int sharedTechnicalSurfaceVersion;
    ModelRenderer technicalSurface;
    int technicalSurfaceVersion;
    const int TechnicalSurfaceGeometryVersion=2;
    const float TechnicalSurfaceBottomY=-9.8f;
    const float TechnicalSurfaceFrontY=-1.1f;
    const float TurfRunoffFrontY=-1f;
    const float TechnicalSurfaceHalfWidth=7.8f;
    const float TechnicalPaintFrontY=-1.25f;
    const float TechnicalPaintWidth=.14f;

    void InitializeTechnicalSurface()
    {
        if(authoredEnvironment!=null)
        {
            technicalSurface=authoredEnvironment.GameObject.GetComponentsInChildren<ModelRenderer>().FirstOrDefault(r=>r.GameObject.Tags.Has("football-technical-surface"));
            technicalSurfaceVersion=TechnicalSurfaceGeometryVersion;return;
        }
        if(technicalSurface!=null && technicalSurfaceVersion==TechnicalSurfaceGeometryVersion)return;
        if(technicalSurface!=null){technicalSurface.GameObject.Destroy();technicalSurface=null;}
        if(sharedTechnicalSurface==null || sharedTechnicalSurfaceVersion!=TechnicalSurfaceGeometryVersion)
        {
            var vertices=new List<Vertex>(12);
            Vertex V(Point at,Vector2 uv)=>new(WorldPoint(at),Vector3.Up,Vector3.Forward,uv);
            for(int team=0;team<2;team++)
            {
                float x=TechnicalAreaPresentation.BenchX(team);
                // The turf includes a one-metre runoff strip. Two opaque
                // coplanar surfaces formerly overlapped there, including half
                // of every front dash. Trim the platform clear of that strip;
                // its paint is part of this sole top face, never a depth overlay.
                var a=new Point(x-TechnicalSurfaceHalfWidth,TechnicalSurfaceBottomY);
                var b=new Point(x+TechnicalSurfaceHalfWidth,TechnicalSurfaceBottomY);
                var c=new Point(x+TechnicalSurfaceHalfWidth,TechnicalSurfaceFrontY);
                var d=new Point(x-TechnicalSurfaceHalfWidth,TechnicalSurfaceFrontY);
                vertices.Add(V(a,new(0,0)));vertices.Add(V(c,new(1,1)));vertices.Add(V(b,new(1,0)));
                vertices.Add(V(a,new(0,0)));vertices.Add(V(d,new(0,1)));vertices.Add(V(c,new(1,1)));
            }
            var bounds=new BBox(WorldPoint(new Point(20,TechnicalSurfaceFrontY),-.02f),
                WorldPoint(new Point(85,TechnicalSurfaceBottomY),.02f));
            var mesh=new Mesh(Material.Load("materials/pitch/technical-area-painted.vmat"));
            mesh.CreateVertexBuffer(vertices.Count,vertices);mesh.Bounds=bounds;
            sharedTechnicalSurface=Model.Builder.AddMesh(mesh).WithViewBounds(bounds).Create();
            environmentSourceVertices[sharedTechnicalSurface]=vertices.ToArray();
            sharedTechnicalSurfaceVersion=TechnicalSurfaceGeometryVersion;
        }
        technicalSurface=Create(sharedTechnicalSurface,"Technical-area painted surface");
        technicalSurface.RenderType=ModelRenderer.ShadowRenderType.Off;
        technicalSurfaceVersion=TechnicalSurfaceGeometryVersion;
    }

    int SidelineGroundStrokeCount()
    {
        int count=0;
        foreach(var stroke in fineStadiumStrokes)
            if(Math.Max(stroke.ZA,stroke.ZB)<=.03f)count++;
        return count;
    }

    public object SidelineSurfaceReport()=>new
    {
        PaintedSurface=technicalSurface!=null,
        PaintedQuads=technicalSurface!=null?2:0,
        PaintedVertices=technicalSurface!=null?12:0,
        GeometryVersion=technicalSurfaceVersion,SharedGeometryVersion=sharedTechnicalSurfaceVersion,
        OpaquePaint=true,
        SurfaceBottomY=TechnicalSurfaceBottomY,SurfaceFrontY=TechnicalSurfaceFrontY,
        TurfFrontY=TurfRunoffFrontY,
        SurfaceGapFromTurfMetres=TurfRunoffFrontY-TechnicalSurfaceFrontY,
        PaintedTurfOverlapSquareMetres=2*TechnicalSurfaceHalfWidth*2*Math.Max(0,TechnicalSurfaceFrontY-TurfRunoffFrontY),
        CoplanarOverlay=TechnicalSurfaceFrontY>TurfRunoffFrontY,
        PaintFrontY=TechnicalPaintFrontY,PaintWidthMetres=TechnicalPaintWidth,
        PaintGapFromTurfMetres=TurfRunoffFrontY-(TechnicalPaintFrontY+TechnicalPaintWidth*.5f),
        FineStadiumGroundStrokes=SidelineGroundStrokeCount(),
        DashBoxes=0,FineStrokes=fineStadiumStrokes.Count,
        FineStrokeVertices=fineStadiumStrokes.Count*18,
        SharedWithGoalStrokeBatch=true,StrokeCapacity=goalStrokeVertices.Length,
        CurrentStrokeVertices=goalStrokeVertexCount,
        Texture="textures/pitch/technical-area-painted-v1.png"
    };
}