using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Azimuth;
using Blacklight.Core;
using Annulus;

namespace Lodestone.TestBed.Demos
{
    public class PointMassBounce : Demo
    {
        Universe universe = new Universe();
        List<Entity> entities = new List<Entity>();
        
        public override void  Initialize()
        {
            var worldBounds = new PerforatedPolygon(new SimplePolygon(new Vector[]
            {
                new Vector(-1100, 1100),
                new Vector(-1100,-1100),
                new Vector(1100,-1100),
                new Vector(1100, 1100),
            }), new SimplePolygon[] { new SimplePolygon(new Vector[]
            {
                new Vector(-1000, 1000),
                new Vector(-1000,-1000),
                new Vector(1000,-1000),
                new Vector(1000, 1000),
            })});

            entities.Add(Entity.BuildFromPolygon(worldBounds));

            entities.ForEach(entity =>
            {
                universe.AddBody(entity.PhysicsBody);
            });
        }

        public override void Shutdown()
        {

        }

        public override void Step(Scalar timeStep)
        {
            universe.Step(timeStep);
        }

        public override Scene Draw()
        {
            var returnMe = new Scene();
            var cel = new Cel();
            returnMe.Cels.Add(cel);

            foreach (var entity in entities)
            {
                var transform = entity.PhysicsBody.Motion.Transform;
                var drawable = entity.DrawPrimitive;

                cel.AddEntity(new Blacklight.Core.Entity
                {
                    drawable = drawable,
                    modelToWorld = transform,
                });
            }

            return returnMe;
        }

        public override string Description { get {
            return "This demo shows a single point bouncing inside a box.";
        } }
    }
}