using Mirror;
using QSB.Utility;
using UnityEngine;

namespace QSB.Syncs.Unsectored.Rigidbodies
{
	public abstract class UnsectoredRigidbodySync : BaseUnsectoredSync
	{
		private const float VelocityChangeThreshold = 0.05f;
		private const float AngularVelocityChangeThreshold = 0.05f;

		protected Vector3 Velocity;
		protected Vector3 AngularVelocity;
		private Vector3 _prevVelocity;
		private Vector3 _prevAngularVelocity;

		public OWRigidbody AttachedRigidbody { get; private set; }
		public OWRigidbody ReferenceRigidbody { get; private set; }

		protected abstract OWRigidbody InitAttachedRigidbody();

		protected sealed override Transform InitAttachedTransform()
		{
			AttachedRigidbody = InitAttachedRigidbody();
			return AttachedRigidbody ? AttachedRigidbody.transform : null;
		}

		public override void SetReferenceTransform(Transform referenceTransform)
		{
			if (ReferenceTransform == referenceTransform)
			{
				return;
			}

			base.SetReferenceTransform(referenceTransform);
			ReferenceRigidbody = ReferenceTransform ? ReferenceTransform.GetAttachedOWRigidbody() : null;
		}

		protected override void UpdatePrevData()
		{
			base.UpdatePrevData();
			_prevVelocity = Velocity;
			_prevAngularVelocity = AngularVelocity;
		}

		protected override void Serialize(NetworkWriter writer)
		{
			base.Serialize(writer);
			writer.Write(Velocity);
			writer.Write(AngularVelocity);
		}

		protected override void Deserialize(NetworkReader reader)
		{
			base.Deserialize(reader);
			Velocity = reader.ReadVector3();
			AngularVelocity = reader.ReadVector3();
		}

		protected override void GetFromAttached()
		{
			transform.position = ReferenceTransform.ToRelPos(AttachedRigidbody.GetPosition());
			transform.rotation = ReferenceTransform.ToRelRot(AttachedRigidbody.GetRotation());
			Velocity = ReferenceRigidbody.ToRelVel(AttachedRigidbody.GetVelocity(), AttachedRigidbody.GetPosition());
			AngularVelocity = ReferenceRigidbody.ToRelAngVel(AttachedRigidbody.GetAngularVelocity());
		}

		protected override void ApplyToAttached()
		{
			var targetPos = ReferenceTransform.FromRelPos(transform.position);
			var targetRot = ReferenceTransform.FromRelRot(transform.rotation);

			var positionToSet = targetPos;
			var rotationToSet = targetRot;

			if (UseInterpolation)
			{
				positionToSet = ReferenceTransform.FromRelPos(SmoothPosition);
				rotationToSet = ReferenceTransform.FromRelRot(SmoothRotation);
			}

			AttachedRigidbody.MoveToPosition(positionToSet);
			AttachedRigidbody.MoveToRotation(rotationToSet);

			var targetVelocity = ReferenceRigidbody.FromRelVel(Velocity, targetPos);
			var targetAngularVelocity = ReferenceRigidbody.FromRelAngVel(AngularVelocity);

			AttachedRigidbody.SetVelocity(targetVelocity);
			AttachedRigidbody.SetAngularVelocity(targetAngularVelocity);
		}

		protected override bool HasChanged() =>
			base.HasChanged() ||
			Vector3.Distance(Velocity, _prevVelocity) > VelocityChangeThreshold ||
			Vector3.Distance(AngularVelocity, _prevAngularVelocity) > AngularVelocityChangeThreshold;
	}
}