using System.Collections.Generic;
using UnityEngine;

namespace Fusion.Addons.SimpleKCC
{
    internal sealed class KCCHits
    {
        public readonly List<KCCHit> All = new List<KCCHit>();

        private static readonly KCCFastStack<KCCHit> _pool = new KCCFastStack<KCCHit>(256, createInstances: true);

        public int Count => All.Count;

        public bool HasCollider(Collider collider)
        {
            int index;
            return Find(collider, out index) != null;
        }

        public KCCHit Add(KCCOverlapHit overlapHit)
        {
            KCCHit kCCHit = _pool.PopOrCreate();
            kCCHit.Collider = overlapHit.Collider;
            kCCHit.Transform = overlapHit.Transform;
            kCCHit.CollisionType = overlapHit.CollisionType;
            All.Add(kCCHit);
            return kCCHit;
        }

        public void CopyFromOther(KCCHits other)
        {
            int count = All.Count;
            int count2 = other.All.Count;
            if (count == count2)
            {
                if (count != 0)
                {
                    for (int i = 0; i < count; i++)
                    {
                        KCCHit kCCHit = All[i];
                        KCCHit kCCHit2 = other.All[i];
                        kCCHit.Collider = kCCHit2.Collider;
                        kCCHit.Transform = kCCHit2.Transform;
                        kCCHit.CollisionType = kCCHit2.CollisionType;
                    }
                }
            }
            else
            {
                Clear();
                for (int j = 0; j < count2; j++)
                {
                    KCCHit kCCHit = _pool.PopOrCreate();
                    KCCHit kCCHit2 = other.All[j];
                    kCCHit.Collider = kCCHit2.Collider;
                    kCCHit.Transform = kCCHit2.Transform;
                    kCCHit.CollisionType = kCCHit2.CollisionType;
                    All.Add(kCCHit);
                }
            }
        }

        public void Clear()
        {
            int i = 0;
            for (int count = All.Count; i < count; i++)
            {
                KCCHit kCCHit = All[i];
                kCCHit.Collider = null;
                kCCHit.Transform = null;
                kCCHit.CollisionType = ECollisionType.None;
                _pool.Push(kCCHit);
            }

            All.Clear();
        }

        private KCCHit Find(Collider collider, out int index)
        {
            int i = 0;
            for (int count = All.Count; i < count; i++)
            {
                KCCHit kCCHit = All[i];
                if ((object)kCCHit.Collider == collider)
                {
                    index = i;
                    return kCCHit;
                }
            }

            index = -1;
            return null;
        }
    }
}