using FlaxEngine;
using Cabrito;
using System.Diagnostics;
using System.IO;

namespace Game
{
	public class CameraMovement : Script
	{
		[Limit(0, 9000), Tooltip("Camera speed")]
		public float MoveSpeed { get; set; } = 400;

		private float viewPitch;
		private float viewYaw;
		private float viewRoll;

		private InputEvent onExit = new InputEvent("Exit");

		public override void OnAwake()
		{
			base.OnAwake();

			onExit.Triggered += () =>
			{
				if (Console.IsSafeToQuit)
					Engine.RequestExit();
			};
		}

		public override void OnDestroy()
		{
			base.OnDestroy();

			onExit.Dispose();
		}

		public override void OnStart()
		{
			var initialEulerAngles = Actor.Orientation.EulerAngles;
			viewPitch = initialEulerAngles.X;
			viewYaw = initialEulerAngles.Y;
			viewRoll = initialEulerAngles.Z;
		}

		public override void OnUpdate()
		{
			var camTrans = Actor.Transform;
			var rootActor = Actor.GetChild(0);
			var camera = rootActor.GetChild<Camera>();

			float xAxis = InputManager.GetAxisRaw("Mouse X");
			float yAxis = InputManager.GetAxisRaw("Mouse Y");
			if (xAxis != 0.0f || yAxis != 0.0f)
			{
				viewPitch += yAxis;
				viewYaw += xAxis;

				viewPitch = Mathf.Clamp(viewPitch, -90.0f, 90.0f);

				// root orientation must be set first
				rootActor.Orientation = Quaternion.Euler(0, viewYaw, 0);
				camera.Orientation = Quaternion.Euler(viewPitch, viewYaw, viewRoll);
			}

			float inputH = InputManager.GetAxis("Horizontal");
			float inputV = InputManager.GetAxis("Vertical");
			var move = new Vector3(inputH, 0.0f, inputV);

			if (!move.IsZero)
			{
				move.Normalize();
				move = camera.Transform.TransformDirection(move) * MoveSpeed;

				{
					Vector3 delta = move * Time.UnscaledDeltaTime;
					float movementLeft = delta.Length;

					// TODO: check multiple times in case we get stuck in walls

					float sphereRadius = 10.0f; // TODO: use collider radius
					RayCastHit[] hitInfos;
					float moveDist = delta.Length;
					Physics.SphereCastAll(Actor.Transform.Translation, sphereRadius, move.Normalized, out hitInfos,
						moveDist);

					//bool nohit = true;
					float hitDistance = moveDist;
					Vector3 hitNormal = move.Normalized;
					foreach (RayCastHit hitInfo in hitInfos)
					{
						if (hitInfo.Collider.Parent == Parent)
							continue;

						if (hitInfo.Distance < hitDistance)
						{
							hitDistance = hitInfo.Distance;
							hitNormal = hitInfo.Normal;
						}
						//nohit = false;
						//break;
					}

					if (hitDistance != moveDist)
					{
						//camTrans.Translation = Vector3.Lerp(Actor.Transform.Translation, camTrans.Translation, hitDistance);

						//projected = normal * dot(direction, normal);
						//direction = direction - projected


						//camTrans.Translation += hitNormal * (moveDist - hitDistance); // correct?
						//camTrans.Translation = hitNormal * (move * hitNormal); // correct?
						//camTrans.Translation = Actor.Transform.Translation;
						delta += -Vector3.Dot(delta, hitNormal) * hitNormal; // correct?
					}

					camTrans.Translation += delta;
				}
			}

			Actor.Transform = camTrans;
		}
	}
}