using System.Collections;
using System.Collections.Generic;

using Syntriax.Engine.Core;

namespace Syntriax.Engine.Physics2D;

public class PhysicsCoroutineManager : Behaviour, IPhysicsUpdate
{
    private readonly Event<IUniverse, IUniverse.UpdateArguments>.EventHandler delegateOnUpdate = null!;

    private readonly List<IEnumerator> enumerators = [];
    private IPhysicsEngine2D? physicsEngine = null;

    public IEnumerator CreateCoroutine(IEnumerator enumerator)
    {
        enumerators.Add(enumerator);
        return enumerator;
    }

    public void StopCoroutine(IEnumerator enumerator)
    {
        enumerators.Remove(enumerator);
    }

    public void PhysicsUpdate(float delta)
    {
        for (int i = enumerators.Count - 1; i >= 0; i--)
        {
            if (enumerators[i].Current is ICoroutineYield coroutineYield && coroutineYield.Yield())
                continue;

            if (!enumerators[i].MoveNext())
                enumerators.RemoveAt(i);
        }
    }

    public PhysicsCoroutineManager() => Priority = int.MinValue;
}