namespace Theater_ECS;
using Theater_ECS.Containers;
using Theater_ECS.Example;

using System;
using System.Collections;

abstract class System
{
	private List<Component> _Components = new .(10) ~ delete _;

	///Get the compoent id and cache it inside of this system
	public void RegisterComponent<T>(ECS ecs) where T : struct => _Components.Add(ecs.RegisterComponent<T>());

	public abstract void RegisterSystem(ECS ecs);

	public virtual void Run(void* p1) { };
	public virtual void Run(void* p1, void* p2) { };
	public virtual void Run(void* p1, void* p2, void* p3) { };



	public void RunSystem(ECS ecs)
	{
		int_cosize count  = int_cosize.MaxValue;
		Component comp = _Components[0];

		for(var c in _Components)
			if(ecs.GetComponentCount(c) < count)
			{
				count = ecs.GetComponentCount(c);
				comp = c;
			}

		//We now have the list of entities to loop through
		Span<Entity> entities = ecs.GetComponentEntities(comp);
		UList main = ecs.[Friend]_compRegistry.Components[comp].[Friend]_packedEntities;

		switch(_Components.Count)
		{
		case 1:
		case 2:
			if(comp == _Components[0])
			{
				var cun = entities.Length-1;
				for(int ii < cun)
				{
					this.Run(
						main[(.)entities[ii].Index],
						ecs.GetComponentData(entities[ii], _Components[1]));
				}
			}
			else
			{

			}

			
		case 3:
			var cun = entities.Length-1;
			for(int ii < cun)
			{
				this.Run(
					ecs.GetComponentData(entities[ii], _Components[0]),
					ecs.GetComponentData(entities[ii], _Components[1]),
					ecs.GetComponentData(entities[ii], _Components[2]));
			}
		}

		
	}
}

class MovementSystem : System
{
	public override void RegisterSystem(ECS ecs)
	{
		RegisterComponent<Position>(ecs);
		//RegisterComponent<waste>(ecs);
		RegisterComponent<Velocity>(ecs);
	}

	public override void Run(void* pos, void* vel)
	{
		((Position*)pos).x += ((Velocity*)vel).x;
		((Position*)pos).y += ((Velocity*)vel).y;

	}

	public override void Run(void* pos, void* waste, void* vel)
	{
		((Position*)pos).x += ((Velocity*)vel).x;
		((Position*)pos).y += ((Velocity*)vel).y;

	}
}