using System;
using BITFALL.Entities.Player.Movement.States;
using BITFALL.Player.Equip;
using BITFALL.Player.Movement;
using BITKit;
using BITKit.Entities;
using BITKit.PlayerCamera;
using BITKit.StateMachine;
using Cysharp.Threading.Tasks;
using Lightbug.CharacterControllerPro.Core;
using UnityEngine;
using UnityEngine.InputSystem;

// ReSharper disable InvertIf
// ReSharper disable RedundantJumpStatement
// ReSharper disable ConvertToConstant.Global

namespace BITFALL.Entities.Player.Movement.States
{
	public abstract class BasicMovement : PlayerCharacterState, IPlayerMovementState
	{
		[SerializeField] protected Vector3 initialCameraPosition;
		[SerializeField] protected float initialSpeed = 3f;
		[SerializeField] protected float initialJumpForce = 5f;
		[Inject] protected IKnockdown knockdown;
		[Inject] protected IPlayerCameraService _cameraService;

		public override void BeforeUpdateMovement(float deltaTime)
		{
			characterController.CurrentCameraPosition.shouldBe = initialCameraPosition;
		}

		public override void AfterUpdateMovement(float deltaTime)
		{
			if (knockdown.IsKnockdown)
			{
				characterController.TransitionState<Knockdown>();
			}
			if (knockdown.IsKnockdown is false && characterController.ExpectParachute.shouldBe)
			{
				characterController.TransitionState<Parachute>();
				characterController.ExpectParachute.Reset();
			}
			else if (characterController.topBlocked is false && characterController.RequestClimb &&
			         characterController.climbClosePoint.TryGetClosePoint(out var closePoint))
			{
				characterController.ExpectClimb.shouldBe = closePoint;
				characterController.TransitionState<Climb>();
				return;
			}
		}

		public override void UpdateVelocity(ref Vector3 currentVelocity, float deltaTime)
		{
			var rotation = Quaternion.Euler(0, characterController.LookInput.y, 0);
			var movementInput = characterController.MovementInput;

			if (_cameraService?.IsCameraActivated is false)
			{
				rotation =Quaternion.LookRotation( _cameraService.CameraRotation * Vector3.forward,Vector3.up);
			}

			var moveVelocity = rotation * new Vector3(
				movementInput.x * Mathf.Min(characterController.initialSpeed, initialSpeed),
				0,
				movementInput.z * initialSpeed
			);
			if (_cameraService?.IsCameraActivated is false)
			{
				moveVelocity = rotation * movementInput * initialSpeed;
			}

			if (characterController.limitSpeed.Allow)
			{
				switch (characterController.CurrentState)
				{
					case IPlayerWalkState:
					case IPlayerCrouchState:
						moveVelocity = Vector3.ClampMagnitude(moveVelocity, characterController.limitSpeed.Value);
						break;
				}
			}

			if (characterController.IsGrounded)
			{
				var effectiveGroundNormal = actor.GroundStableNormal;


				var inputRight = Vector3.Cross(moveVelocity, Vector3.up);
				var reorientedInput = Vector3.Cross(effectiveGroundNormal, inputRight).normalized *
				                      moveVelocity.magnitude;
				var targetMovementVelocity = reorientedInput; //* initialSpeed;

				// Smooth movement Velocity

				var newVelocity =
					Vector3.Lerp(currentVelocity, targetMovementVelocity, 1f - Mathf.Exp(-16 * deltaTime));
				currentVelocity = newVelocity;

				if (characterController.ExpectJump.shouldBe)
				{
					actor.ForceNotGrounded();
					currentVelocity += Vector3.up * initialJumpForce;
					characterController.ExpectJump.Reset();
					
					characterController.ExecuteCommand<OnPlayerJumpCommand>();
				}
			}
			else
			{
				if (moveVelocity.sqrMagnitude > 0f)
				{
					var addedVelocity = moveVelocity * (3 * deltaTime);

					var currentVelocityOnInputsPlane = Vector3.ProjectOnPlane(currentVelocity, Vector3.up);

					// Limit air velocity from inputs
					if (currentVelocityOnInputsPlane.magnitude < 5)
					{
						// clamp addedVel to make total vel not exceed max vel on inputs plane
						Vector3 newTotal = Vector3.ClampMagnitude(currentVelocityOnInputsPlane + addedVelocity, 5);
						addedVelocity = newTotal - currentVelocityOnInputsPlane;
					}
					else
					{
						// Make sure added vel doesn't go in the direction of the already-exceeding velocity
						if (Vector3.Dot(currentVelocityOnInputsPlane, addedVelocity) > 0f)
						{
							addedVelocity =
								Vector3.ProjectOnPlane(addedVelocity, currentVelocityOnInputsPlane.normalized);
						}
					}

					// Prevent air-climbing sloped walls
					if (actor.WallCollision)
					{
						if (Vector3.Dot(currentVelocity + addedVelocity, addedVelocity) > 0f)
						{
							var perpenticularObstructionNormal = Vector3
								.Cross(Vector3.Cross(Vector3.up, actor.GroundContactNormal), Vector3.up).normalized;
							addedVelocity = Vector3.ProjectOnPlane(addedVelocity, perpenticularObstructionNormal);
						}
					}

					// Apply added velocity
					currentVelocity += addedVelocity;
				}
				// Gravity

				currentVelocity += -Vector3.up * (30 * deltaTime);
				// Drag
				currentVelocity *= (1f / (1f + (0.1f * deltaTime)));
			}
		}

		public override void UpdateRotation(ref Quaternion currentRotation, float deltaTime)
		{
			var newRotation = Quaternion.Euler(0, characterController.LookInput.y, 0);



			if (_cameraService.IsCameraActivated is false)
			{
				if (Physics.Raycast(_cameraService.CameraPosition, _cameraService.CameraRotation * Vector3.forward,
					    out var hit, 256, LayerMask.GetMask("Default"), QueryTriggerInteraction.Ignore))
				{
					characterController.ViewForward = (hit.point - (characterController.Position +
					                                                characterController.Rotation *
					                                                characterController.ViewCenter)).normalized;

					newRotation = Quaternion.LookRotation(characterController.ViewForward);
					characterController.ViewRotation = newRotation;

					characterController.FocusPoint = hit.point;

					Debug.DrawLine(_cameraService.CameraPosition, hit.point, Color.green, 0.1f);
					Debug.DrawLine(characterController.Position + characterController.ViewCenter,
						characterController.Position +
						characterController.ViewCenter + characterController.ViewRotation * Vector3.forward
						, Color.blue, 0.1f);
				}
				else
				{
					
						
					characterController.ViewRotation =  Quaternion.Euler(characterController.LookInput);;

					characterController.FocusPoint = characterController.Position +
					                                 characterController.ViewRotation * Vector3.forward * 256;
					
					Debug.DrawLine(_cameraService.CameraPosition, _cameraService.CameraRotation * Vector3.forward,
						Color.red, 0.1f);
				}
					

				var rotationDirection = _cameraService.CameraRotation * characterController.MovementInput;
				rotationDirection = Vector3.ProjectOnPlane(rotationDirection, Vector3.up);
				if (rotationDirection.sqrMagnitude >= 0.16f)
				{
					var newPlayerRotation =Quaternion.LookRotation(rotationDirection) ;
					currentRotation = Quaternion.Lerp(currentRotation, newPlayerRotation, 1f - Mathf.Exp(-16 * deltaTime));
				}

				if (characterController.allowFocus)
				{
					currentRotation =
						Quaternion.LookRotation(_cameraService.CameraRotation * Vector3.forward, Vector3.up);
				}
			}
			else
			{
				currentRotation = newRotation;
			}
		}
	}

	[Serializable]
	public sealed class Walk:BasicMovement,IPlayerWalkState
	{
		public override void AfterUpdateMovement(float deltaTime)
		{
			base.AfterUpdateMovement(deltaTime);
			if (characterController.CurrentState != this) return;
			switch (characterController.ExpectRun.shouldBe,characterController.ExpectCrouch.shouldBe)
			{
				case (_,true):
					characterController.TransitionState<Crouch>();
					return;
				case (true,false) when characterController.pauseRun.Allow is false:
					characterController.TransitionState<Run>();
					return;
			}
		}
	}

	[Serializable]
	public sealed class Parachute : PlayerCharacterState, IPlayerParachuteState
	{
		[SerializeField] private float moveDamping = 3f;
		[SerializeField] private float damping = 1f;
		
		[Inject] private IEquipService _equipService;
		public override void OnStateEntry(IState old)
		{
			base.OnStateEntry(old);
			characterController.InvokeOpenParachute();
			_equipService.AllowEquip.AddDisableElements(this);
		}

		public override void OnStateExit(IState old, IState newState)
		{
			base.OnStateExit(old, newState);
			characterController.InvokeCloseParachute();
			
			_equipService.AllowEquip.RemoveDisableElements(this);
		}

		public override void UpdateRotation(ref Quaternion currentRotation, float deltaTime)
		{
			currentRotation = Quaternion.Euler(0,characterController.LookInput.y,0);
		}

		public override void UpdateVelocity(ref Vector3 currentVelocity, float deltaTime)
		{
			var rotation = Quaternion.Euler(0,characterController.LookInput.y,0);
			var moveVelocity = rotation * characterController.MovementInput;
			currentVelocity.y =
				Mathf.MoveTowards(
					currentVelocity.y,
					-8,
					damping * deltaTime
				);
			currentVelocity+= moveVelocity.normalized * (moveDamping * deltaTime);
			currentVelocity.x = Mathf.Clamp(currentVelocity.x, -moveDamping, moveDamping);
			currentVelocity.z = Mathf.Clamp(currentVelocity.z, -moveDamping, moveDamping);
		}
		public override void AfterUpdateMovement(float deltaTime)
		{
			if (actor.IsGrounded)
			{
				characterController.TransitionState<Walk>();
			}
			characterController.ExpectParachute.Reset();
			characterController.CurrentCameraPosition.shouldBe = characterController.FpvLocalPosition;
		}
	}
	[Serializable]
	public sealed class Run:BasicMovement,IPlayerRunState
	{
		public override void OnStateEntry(IState old)
		{
			characterController.ExpectRun.being = true;
		}

		public override void OnStateExit(IState old, IState newState)
		{
			characterController.ExpectRun.being = false;
		}

		public override void AfterUpdateMovement(float deltaTime)
		{
			base.AfterUpdateMovement(deltaTime);
			
			switch (characterController.ExpectRun.shouldBe,characterController.ExpectCrouch.shouldBe)
			{
				case (_,true):
					characterController.TransitionState<Crouch>();
					return;
				case (false,false):
					characterController.TransitionState<Walk>();
					return;
			}
			if (characterController.pauseRun.Allow)
			{
				characterController.TransitionState<Walk>();
				return;
			}
			if (characterController.ExpectSprint.shouldBe)
			{
				characterController.TransitionState<Sprint>();
				return;
			}
		}

		public override void ExecuteCommand<T>(T command)
		{
			if (Enabled is false) return;
			if (command is PlayerCancelRunCommand)
			{
				characterController.TransitionState<Walk>();
			}
		}
	}

	[Serializable]
	public sealed class Slide : BasicMovement, IPlayerSlideState
	{
		[Header(nameof(Slide))]
		[SerializeField] private float additiveSpeed = 1f;
		[SerializeField] private float damping = 1;
		[SerializeField] private float stopSpeed = 0.64f;
		[SerializeField] private bool alwaysSlide;
		private bool _addedVelocity;
		public override void OnStateEntry(IState old)
		{
			characterController.ExpectCrouch.being = true;
			characterController.ExpectCrouch.shouldBe = true;
			characterController.ExecuteCommand<PlayerCancelRunCommand>();
			_addedVelocity = false;
		}

		public override void UpdateVelocity(ref Vector3 currentVelocity, float deltaTime)
		{
			if (alwaysSlide && actor.IsGrounded is false)
			{
				base.UpdateVelocity(ref currentVelocity, deltaTime);
			}
			else
			{
				if (_addedVelocity is false)
				{
					currentVelocity += currentVelocity.normalized * additiveSpeed;
					_addedVelocity = true;
				}
				else
				{
					currentVelocity = Vector3.Lerp(currentVelocity, Vector3.zero, deltaTime * damping);
				}
			}
		}
		public override void AfterUpdateMovement(float deltaTime)
		{
			if (characterController.ExpectRun.shouldBe)
			{
				characterController.TransitionState<Run>();
				return;
			}
			if (characterController.ExpectCrouch.shouldBe is false || (alwaysSlide is false && actor.IsGrounded is false))
			{
				characterController.TransitionState<Walk>();
				return;
			}
			if (actor.Velocity.sqrMagnitude <= stopSpeed)
			{
				characterController.TransitionState<Crouch>();
			}
			characterController.CurrentCameraPosition.shouldBe = characterController.FpvLocalPosition;
		}
	}
	[Serializable]
	public sealed class Crouch:BasicMovement,IPlayerCrouchState
	{
	
		public override void OnStateEntry(IState old)
		{
			characterController.ExpectCrouch.being = true;
		}

		public override void OnStateExit(IState old, IState newState)
		{
			characterController.ExpectCrouch.being = false;
		}
		public override void AfterUpdateMovement(float deltaTime)
		{
			base.AfterUpdateMovement(deltaTime);
			if (characterController.ExpectRun.shouldBe)
			{
				characterController.TransitionState<Run>();
				return;
			}

			if (characterController.ExpectCrouch.shouldBe is false)
			{
				characterController.TransitionState<Walk>();
				return;
			}
		}
	}
	[Serializable]
	public sealed class Sprint:BasicMovement,IPlayerSprintState
	{
		[SerializeField] private int slideCost = 16;
		[SerializeField] private int staminaCost = 1;
		public override void OnStateEntry(IState old)
		{
			characterController.ExpectSprint.being = true;
		}
		public override void OnStateExit(IState old, IState newState)
		{
			characterController.ExpectSprint.being = false;
		}
		public override void OnStateUpdate(float deltaTime)
		{
			characterController.Stamina -= staminaCost * deltaTime;
		}
		public override void AfterUpdateMovement(float deltaTime)
		{
			base.AfterUpdateMovement(deltaTime);
			if (characterController.pauseRun.Allow)
			{
				characterController.TransitionState<Walk>();
				return;
			}
			switch (characterController.ExpectRun.shouldBe,characterController.ExpectCrouch.shouldBe)
			{
				case (_,_) when characterController.Stamina is 0:
					characterController.ExpectSprint.Reset();
					characterController.TransitionState<Run>();
					return;
				case (_,true) when characterController.IsGrounded && characterController.Stamina > 0:
					characterController.Stamina -= slideCost;
					characterController.TransitionState<Slide>();
					return;
				case (_,true):
					characterController.TransitionState<Crouch>();
					return;
				case (false,false):
					characterController.TransitionState<Walk>();
					return;
			}
		}
		public override void ExecuteCommand<T>(T command)
		{
			if (Enabled is false) return;
			if(command is PlayerCancelRunCommand)
				characterController.TransitionState<Walk>();
		}
	}

	[Serializable]
	public sealed class Knockdown : BasicMovement, IPlayerKnockdownState
	{
		public override void Initialize()
		{
			base.Initialize();
			knockdown.OnKnockdown += OnKnockdown;
			knockdown.OnRevive += OnRevive;
		}

		public override void UpdateVelocity(ref Vector3 currentVelocity, float deltaTime)
		{
			base.UpdateVelocity(ref currentVelocity, deltaTime);
			if (knockdown.IsPressured)
			{
				currentVelocity.x = 0;
				currentVelocity.z = 0;
			}
		}

		private void OnRevive()
		{
			if(Enabled)characterController.TransitionState<Walk>();
		}

		private void OnKnockdown()
		{
			characterController.TransitionState<Knockdown>();
		}
	}
	[Serializable]
	public sealed class Clip:PlayerCharacterState
	{
		[BITCommand]
		public static void NoClip()
		{
			_clipAction?.Invoke();
		}
		private static Action _clipAction;
		
		[SerializeField] private InputActionReference clipAction;
		[SerializeReference, SubclassSelector] private IReference clipEnv;
		[Inject] private IHealth _health;
		[Inject] private InputActionGroup _inputActionGroup;
		
		public override void Initialize()
		{
			base.Initialize();
			
			_health.OnSetAlive += OnSetAlive;
			
			Data.AddListener<bool>(clipEnv.Value, OnClip);

			_clipAction = _ClipAction;

			characterController.destroyCancellationToken.Register(() =>
			{
				Data.RemoveListender<bool>(clipEnv.Value, OnClip);
			});
		}

		private void _ClipAction()
		{
			var clip = Data.Get<bool>(clipEnv.Value);
			Data.Set(clipEnv.Value, !clip);
		}

		private async void OnClip(bool obj)
		{
			await UniTask.SwitchToMainThread();
			if(_health.IsAlive is false) return;
			if (obj && Enabled is false)
			{
				characterController.TransitionState<Clip>();
				//BIT4Log.Log<Clip>("NoClip Enabled");
			}else if (Enabled && obj is false)
			{
				characterController.TransitionState<Walk>();
				//BIT4Log.Log<Clip>("NoClip Disabled");
			}
		}

		private void OnSetAlive(bool obj)
		{
			if (Enabled && obj is false)
			{
				characterController.TransitionState<Walk>();
			}
		}

		public override void OnStateEntry(IState old)
		{
			base.OnStateEntry(old);
			actor.Velocity = default;
			actor.ColliderComponent.enabled = false;
			actor.alwaysNotGrounded = true;
		}

		public override void OnStateExit(IState old, IState newState)
		{
			base.OnStateExit(old, newState);
			actor.ColliderComponent.enabled = true;
			actor.alwaysNotGrounded = false;
		}

		public override void AfterUpdateMovement(float deltaTime)
		{
			base.AfterUpdateMovement(deltaTime);
			actor.Position += characterController.ViewRotation * characterController.MovementInput * (
				deltaTime * (_inputActionGroup.GetAction(characterController.RunAction).IsPressed()
					? 8
					: characterController.initialSpeed
					  ));
			actor.Rotation = Quaternion.Euler(0,characterController.LookInput.y,0);
		}
	}
}