using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using BITFALL.Player.Equip;
using BITFALL.Player.Movement;
using BITKit;
using BITKit.Entities;
using BITKit.Selection;
using BITKit.StateMachine;
using Unity.Mathematics;
using UnityEngine;
using UnityEngine.AI;
using UnityEngine.InputSystem;
using UnityEngine.InputSystem.Interactions;
using UnityEngine.Splines;
using UnityEngine.UI;

namespace BITFALL.Entities.Player.Movement.States
{
	[Serializable]
    public class Climb : PlayerCharacterState,IPlayerClimbState
    {
	    [SerializeField] protected float lerpDelta = 5;
	    private IntervalUpdate cancelInterval = new(0.16f);

	    private bool needInit;
	   
	    public override void OnStateEntry(IState old)
       {
	       base.OnStateEntry(old);
	       characterController.ExpectCrouch.Reset();
	       actor.alwaysNotGrounded = true;
	       actor.ForceNotGrounded();
	       actor.ColliderComponent.enabled = false;
	       cancelInterval.Reset();
	       needInit = true;
           
	       characterController.LimitViewAngle = 80;
       }
       public override void OnStateUpdate(float deltaTime)
       {
	       var distance = Vector3.Distance(characterController.ExpectClimb.shouldBe,
		       characterController.transform.position);
	       if (
		       distance<=0.16f
		       || actor.IsStable
		       || cancelInterval.AllowUpdate && actor.Velocity.sqrMagnitude<=0.16f
		       )
	       {
		       Exit();
		       return;
	       }

	       if (characterController.Position.y >= characterController.ExpectClimb.shouldBe.y)
	       {
		       Exit();
	       }
       }
       public override void OnStateExit(IState old, IState newState)
       {
	       actor.alwaysNotGrounded = false;
	       actor.ColliderComponent.enabled = true;
	       characterController.ExpectJump.Reset();
	       actor.ForceGrounded();
	       
	       characterController.LimitViewAngle = 0;
       }

       public override void UpdateVelocity(ref Vector3 currentVelocity, float deltaTime)
       {
	       if (needInit)
	       {
		       currentVelocity.y = 0;
		       needInit = false;
	       }
	       var velocity =(characterController.ExpectClimb.shouldBe - characterController.transform.position)*lerpDelta;

	       velocity += characterController.Rotation * characterController.MovementInput.normalized * 1.0f;
	       currentVelocity = Vector3.Lerp(currentVelocity,velocity,lerpDelta*deltaTime);
	       
	       
       }

       public override void AfterUpdateMovement(float deltaTime)
       {
	       characterController.CurrentCameraPosition.shouldBe = characterController.FpvLocalPosition;
       }
    }
    [Serializable]
    public sealed class Link:PlayerCharacterState,IPlayerLinkState
    {
	    public int LinkArea { get; private set; }
	     private OffMeshLink _offMeshLink;
			private ISplineContainer _splineContainer;
			private float progress;
			private float increment;
			
			[Inject] private IEquipService _equipService;
			[Inject] private InputActionGroup _inputActionGroup;
			
			private readonly IntervalUpdate exitInterval = new(0.32f);

	    public override void OnStateEntry(IState old)
	    {
		    base.OnStateEntry(old);
		
		    characterController.ExpectCrouch.Reset();

		    characterController.ExpectJump.Reset();
		    
		    actor.ForceNotGrounded();
		    
		    actor.RigidbodyComponent.IsKinematic = true;
		    actor.ColliderComponent.enabled = false;
		    
		    Init(characterController.OffMeshLink);

		    characterController.LimitViewAngle = 45;
		    
		    _equipService.AllowEquip.AddDisableElements(this);
		    
		    exitInterval.Reset();

		    _inputActionGroup.RegisterCallback(characterController.CrouchAction, OnCrouch);
		    _inputActionGroup.RegisterCallback(characterController.JumpAction, OnJump);
	    }

	    private void OnJump(InputAction.CallbackContext obj)
	    {
		    switch (obj)
		    {
			    case {interaction:PressInteraction,performed:true}:
				    Exit();
				    return;
		    }
	    }
	    private void OnCrouch(InputAction.CallbackContext obj)
	    {
		    switch (obj)
		    {
			    case { interaction: PressInteraction, performed: true }:
				    Exit();
				    return;
		    }
	    }

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

		    characterController.LimitViewAngle = 0;
		    
		    _equipService.AllowEquip.RemoveDisableElements(this);
		    
		    _inputActionGroup.UnRegisterCallback(characterController.CrouchAction, OnCrouch);
		    _inputActionGroup.UnRegisterCallback(characterController.JumpAction, OnJump);
	    }

	    private void Init(OffMeshLink offMeshLink)
	    {
		    var offsetTransform = offMeshLink.transform;
		    _offMeshLink = offMeshLink;

		    offMeshLink.TryGetComponent<ISplineContainer>(out _splineContainer);
		    
		    LinkArea = offMeshLink.area;

		    if (_splineContainer is not null)
		    {
			    var isStart =
				    Vector3.Distance(
					    actor.Position,
					    offsetTransform.TransformPoint(_splineContainer.Splines[0].Knots.First().Position)
				    ) <
				    Vector3.Distance(
					    actor.Position,
					    offsetTransform.TransformPoint(_splineContainer.Splines[0].Knots.Last().Position)
				    );
			    progress = isStart ? 0 : 1;
			    increment = isStart ? 1 : -1;
		    }
		    else
		    {
			    var offset = Mathf.Lerp(offMeshLink.startTransform.position.y,offMeshLink.endTransform.position.y,0.5f);
			    var offsetPos = actor.Position;
			    offsetPos.y = offset;
			    actor.ForceNotGrounded();
			    actor.Position = Vector3.MoveTowards(actor.Position, offsetPos, 0.64f);
			    progress = 0.5f;
		    }
	    }

	    public override void UpdateRotation(ref Quaternion currentRotation, float deltaTime)
	    {
		    if (_splineContainer is null)
		    {
			    actor.Rotation = Quaternion.Lerp(
				    actor.Rotation,
				    _offMeshLink.transform.rotation * Quaternion.Euler(0,-180,0),
				    5 * deltaTime
			    );
		    }
	    }

	    public override void UpdateVelocity(ref Vector3 currentVelocity, float deltaTime)
	    {
		    actor.ForceNotGrounded();
		    
		    if (_offMeshLink is null) return;
		    switch (_splineContainer)
		    {
			    case null:
				    var positionA = _offMeshLink.startTransform.position;
				    var positionB = positionA;
				    positionB.y = _offMeshLink.endTransform.position.y;
				    var positionC = actor.Position + Vector3.up * (characterController.MovementInput.z * deltaTime * 1.6f);
		 
				    Vector3 vectorAC = positionC - positionA;
				    Vector3 vectorAB = positionB - positionA;
		    
				    Vector3 closestPoint = positionA + Vector3.Project(vectorAC, vectorAB);

				    actor.Position = closestPoint;
				    //currentVelocity = Vector3.Lerp(currentVelocity , (closestPoint - actor.Position) , 5 * deltaTime);
				    
				    characterController.UnityEntity.SetDirect(BITHash.Player.ActionSpeed,characterController.MovementInput.z);
				   
				    break;
			    case not null:
				    var trans = _offMeshLink.transform;
				    var pos =trans.position + trans.rotation * _splineContainer.Splines[0].EvaluatePosition(progress +=increment * deltaTime);
				    
				    actor.Position =Vector3.Lerp(actor.Position , pos , 8*deltaTime) ;
				    break;
		    }
		    
		  
	    }

	    public override void OnStateUpdate(float deltaTime)
	    {

		    if (exitInterval.AllowUpdateWithoutReset is false) return;
		    switch (_offMeshLink,_splineContainer)
		    {
			    case (null,null):
				    Exit();
				    break;
			    case (not null,not null):
				    if (progress is > 1.1f or < -0.1f)
				    {
					    Exit();
				    }
				    break;
			    case (not null,null):
				    if (actor.Position.y > _offMeshLink.endTransform.position.y)
				    {
					    Exit();
					    actor.Position = _offMeshLink.endTransform.position;
				    }else if (actor.Position.y < _offMeshLink.startTransform.position.y)
				    {
					    Exit();
					    actor.Position = _offMeshLink.startTransform.position;
				    }
				    break;
		    }
		   
	    }
	    public override void AfterUpdateMovement(float deltaTime)
	    {
		    characterController.CurrentCameraPosition.shouldBe = characterController.FpvLocalPosition;
	    }
    }

    [Serializable]
    public sealed class Dodge : PlayerCharacterState,IPlayerDodgeState
    {
	    [SerializeField] private int costStamina = 10;
	    [SerializeField] private AnimationCurve curve;
	    [SerializeField] private float duration = 0.32f;
	    private int direction;
	    private float process;

	    [Inject] private IHealth _health;
	    public override void Initialize()
	    {
		    base.Initialize();
		    _health.OnDamageFactory += OnDamageFactory;
	    }

	    public override void OnStateEntry(IState old)
	    {
		    base.OnStateEntry(old);
		    direction = characterController.MovementInput.x > 0 ? 1 : -1;
		    process = 0;
		    characterController.Stamina-= costStamina;
	    }

	    public override void UpdateVelocity(ref Vector3 currentVelocity, float deltaTime)
	    {
		    currentVelocity = actor.transform.right * (direction * curve.Evaluate(process+=deltaTime / duration));
	    }

	    public override void AfterUpdateMovement(float deltaTime)
	    {
		    if(process>=1)
			    Exit();
		    if(actor.IsGrounded is false)Exit();
	    }

	    private int OnDamageFactory(DamageMessage msg, int currentDamage)
	    {
		    if (characterController.CurrentState is not IPlayerDodgeState || msg.Initiator is not Entity initiator)
			    return currentDamage;
		    var _direction = characterController.Position - initiator.transform.position;
		    var verticalAngle = Vector3.Angle(initiator.transform.forward, _direction) - 90.0f;
		    //Debug.Log(verticalAngle);
		    return 0;

	    }
    }
    [Serializable]
    public sealed class Fixed:PlayerCharacterState,IPlayerFixedState
    {
	    public object FixedObject=>_fixedPlace;
	    public float3 FixedPosition=>_fixedPlace.FixedPosition;
	    public quaternion FixedRotation=>_fixedPlace.FixedRotation;
	    public float3 FixedLocalPosition => throw new NotImplementedException();
	    public quaternion FixedLocalRotation => throw new NotImplementedException();
	    private IPlayerFixedPlace _fixedPlace;

	    [Inject] private ISelector _selector;
	    
	    [Inject] private IEquipService _equipService;

	    [Inject] private IKnockdown _knockdown;
	    public override void Initialize()
	    {
		    base.Initialize();
		    _selector.OnActive+=OnSelectorActive;
	    }

	    public override void OnStateEntry(IState old)
	    {
		    base.OnStateEntry(old);
		    //actor.enabled = false;
		    //actor.RigidbodyComponent.IsKinematic = true;
		    actor.ColliderComponent.enabled = false;
		    actor.PhysicsComponent.enabled = false;
		    actor.alwaysNotGrounded = true;
		    actor.constraintRotation = false;
		    characterController.ExpectCrouch.Reset();
		    characterController.LimitViewAngle = 100;
		    
		    _equipService.AllowEquip.AddDisableElements(this);

		    lastRotation = _fixedPlace.FixedRotation;
		    
	    }

	    public override void OnStateExit(IState old, IState newState)
	    {
		    base.OnStateExit(old, newState);
		    //actor.RigidbodyComponent.IsKinematic = false;
		    actor.ColliderComponent.enabled = true;
		    actor.alwaysNotGrounded = false;
		    actor.PhysicsComponent.enabled = true;
		    actor.constraintRotation = true;
		    //actor.enabled = true;
		    characterController.LimitViewAngle = 0;
		    
		    _equipService.AllowEquip.RemoveDisableElements(this);
	    }
	    public override void UpdateVelocity(ref Vector3 currentVelocity, float deltaTime)
	    {
				  currentVelocity = default;
				  actor.Position = FixedPosition + _fixedPlace.Velocity * deltaTime;
			    ;
	    }
	    public override void UpdateRotation(ref Quaternion currentRotation, float deltaTime)
	    {
		    currentRotation = FixedRotation;
	    }
	    public override void AfterUpdateMovement(float deltaTime)
	    {
		    base.AfterUpdateMovement(deltaTime);
		    characterController.CurrentCameraPosition.shouldBe = characterController.FpvLocalPosition;
		    if (characterController.ExpectCrouch.shouldBe && _fixedPlace.Exit(characterController.Entity))
		    {
			    characterController.ExpectCrouch.Reset();
			    Exit();
		    }else if (_fixedPlace is null)
		    {
			    Exit();
		    }
	    }
	    private void OnSelectorActive(ISelectable obj)
	    {
		    if (obj is not MonoBehaviour monoBehaviour ||
		        monoBehaviour.TryGetComponent<IPlayerFixedPlace>(out var fixedPlace) is false) return;
		    if (_knockdown.IsKnockdown) return;
		    if (_fixedPlace?.Exit(characterController.Entity) is false)
		    {
			    return;
		    }
		    if (fixedPlace.Entry(characterController.Entity))
		    {
			    _fixedPlace = fixedPlace;
				characterController.TransitionState<Fixed>();
				return;
		    }
		    _fixedPlace = null;
	    }

	    private quaternion lastRotation;
	    public override void OnStateUpdate(float deltaTime)
	    {
		   base.OnStateUpdate(deltaTime);
		   var rotation = Quaternion.Inverse(_fixedPlace.FixedRotation) * lastRotation;
		   var euler =MathV.TransientRotationAxis(rotation.eulerAngles);
		   var add = new float2(euler.x, -euler.y);
		   characterController.AddViewEuler(add);
		   lastRotation = _fixedPlace.FixedRotation;
	    }
	    protected override void Exit()
	    {
		    base.Exit();
		    if (_fixedPlace is not null)
		    {
			    actor.Position = _fixedPlace.ExitPosition;
		    }
		    _fixedPlace = null;
	    }
    }
}