using Unity.Burst;
using Unity.Entities;
using Unity.Physics.Authoring;
using UnityEngine;
using UnityEngine.Assertions;

namespace UGS {
	/// <summary>
	/// Tag component for causing things to stick.
	/// Could I also do this with a Physics.Material "Custom Flags" or "Collision Filter" ?
	/// </summary>
	[BurstCompile]
	public struct StickCause : IComponentData {
		public float radius; // to calculate contact point
	}

	public sealed class StickCauseMB : MonoBehaviour, IConvertGameObjectToEntity {

		public void Convert(Entity entity, EntityManager dstManager, GameObjectConversionSystem conversionSystem) {
			if (!enabled)
				return;

			var physicsShape = GetComponent<PhysicsShape>();
			Assert.IsNotNull(physicsShape, this.ToString());
			var componentData = new StickCause { radius = physicsShape.ConvexRadius * transform.localScale.x }; // assumes uniform scaling
			dstManager.AddComponentData(entity, componentData);

			Assert.IsTrue(GetComponent<PhysicsShape>().RaisesCollisionEvents, this.ToString()); // Causes dependency on Unity.Physics.Authoring in our asmdef

			// TODO: Validate/set "Raises Collision Events" flag
			// Should this be done for either/both MB (PhysicsShape) and/or Physics.Material
			// For prior:
			// Use PhysicsShape.MaterialTemplate and/or...
			// Use the IInheritPhysicsMaterialProperties and check both (a) OverrideRaisesCollisionEvents and (b) Template
			// get the PhysicsMaterialTemplate (a ScriptableObject but maybe temp?) and set RaisesCollisionEvents
			// dstManager.GetComponentData<PhysicsShape>()
			//
			// For latter:
			// Physics.Material has a "Flags" value that should be Material.MaterialFlags.EnableCollisionEvents
	}

	}
}