using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.UIElements;

namespace Player.Movement
{
    public partial class PlayerMovementController : MonoBehaviour
    {
        public bool IsGrounded { get; private set; }
        public bool IsCrouching { get; private set; }
        public bool IsMoving { get; private set; }

        public Vector3 Velocity
        {
            get => _rigidbody.velocity;
            set => _rigidbody.velocity = value;
        }

        public float FrictionCoefficient {
            get => frictionCoefficient;
            set => frictionCoefficient = value;
        }

        public Vector3 Position => _rigidbody.position;

        // refs
        private Rigidbody _rigidbody;
        private CapsuleCollider _capsuleCollider;
       

        // private fields
        private readonly GroundChecker _groundChecker = new();
        private RaycastHit[] _hit;
        private RaycastHit _hitMovement;
        private float _timeSinceLanding;
        private bool _wasGroundedLastFrame;
       

        private void Awake()
        {
            _rigidbody = GetComponent<Rigidbody>();
            _capsuleCollider = GetComponent<CapsuleCollider>();
            _document = GetComponent<UIDocument>();
           
             
        }
        

        private void OnEnable()
        {
            jumpAction.action.performed += Jump;
            slideAction.action.started += SlideStart;
            slideAction.action.canceled += SlideEnd;
            crouchAction.action.started += CrouchStart;
            crouchAction.action.canceled += CrouchEnd;
            sprintAction.action.started += SprintStart;
            sprintAction.action.canceled += SprintEnd;
        }

        private void OnDisable()
        {
            jumpAction.action.performed -= Jump;
            slideAction.action.started -= SlideStart;
            slideAction.action.canceled -= SlideEnd;
            crouchAction.action.started -= CrouchStart;
            crouchAction.action.canceled -= CrouchEnd;
            sprintAction.action.started -= SprintStart;
            sprintAction.action.canceled -= SprintEnd;
        }
       
        private void Update()
        {
            


           //////// _bank.OpenBankUI();





            IsGrounded = _groundChecker.IsGrounded(transform, _capsuleCollider.bounds, extraHeight, out _hit,
                groundLayerMask);

            // my brain's fried, idek why this works
            if (IsGrounded)
            {
                if (_wasGroundedLastFrame)
                {
                    _timeSinceLanding += Time.deltaTime;
                }
                else
                {
                    _timeSinceLanding = 0;
                }
            }
            else
            {
                _timeSinceLanding = 0;
            }
            _wasGroundedLastFrame = IsGrounded;

            IsMovingCheck();

            UpdateWhichSurfaceNormalToUse();

            SlopeSlidingHandling();

            UpdatePlayerRotation();

            StaminaSystem();

            
        }

       

        private void UpdatePlayerRotation()
        {
            transform.rotation = Quaternion.Euler(0, playerCameraController.CameraRotationVector.y, 0);
        }

        private void IsMovingCheck()
        {
            var playerInput = moveAction.action.ReadValue<Vector2>();
            IsMoving = playerInput.magnitude > 0;
        }

        private void UpdateWhichSurfaceNormalToUse()
        {
            float steepestAngle = 0;
            var steepestRaycast = _hit[0];
            foreach (var raycastHit in _hit)
            {
                var angle = Vector3.Angle(raycastHit.normal, Vector3.up);
                if (angle > steepestAngle)
                {
                    steepestAngle = angle;
                    steepestRaycast = raycastHit;
                }
            }

            _hitMovement = steepestRaycast;
        }

        private void SlopeSlidingHandling()
        {
            _rigidbody.useGravity = !IsGrounded;
        }
        
        private void FixedUpdate()
        {
            SlideSpeedCheck();
            if (IsGrounded && !NoFrictionLandTimeframeMet() && !IsMoving)
            {
                ApplyFriction();
            }

            if (!IsSliding)
            {
                Move();
            }

        }

        private bool NoFrictionLandTimeframeMet()
        {
            return _timeSinceLanding < 0.1f;
        }

        private void ApplyFriction()
        {
            var velMag = _rigidbody.velocity.magnitude;
            if (velMag <= 0f) return;

            var normal = _hitMovement.normal;

            var frictionForceMag = frictionCoefficient * velMag;

            var counterForce = -_rigidbody.velocity * frictionForceMag / velMag;
            counterForce.y = 0;
            counterForce = Vector3.ProjectOnPlane(counterForce, normal);

            _rigidbody.AddForce(counterForce, ForceMode.VelocityChange);
        }


        private void Move()
        {
            var playerInput = moveAction.action.ReadValue<Vector2>();
            var movementDirection = new Vector3(playerInput.x, 0, playerInput.y);
            var normal = _hitMovement.normal;

            var cameraRotationVector = playerCameraController.CameraRotationVector;
            cameraRotationVector = new Vector2(0, cameraRotationVector.y);
            var cameraRotation = Quaternion.Euler(cameraRotationVector);

            var desiredMovementDirection = cameraRotation * movementDirection;

            var velocityInDirection = Vector3.Dot(_rigidbody.velocity, desiredMovementDirection);

            var missingSpeed = maxMovementSpeed - velocityInDirection;

            missingSpeed = Mathf.Clamp(missingSpeed, 0, acceleration);

            var force = desiredMovementDirection * missingSpeed;
            force = Vector3.ProjectOnPlane(force, normal);

            // Debug.Log($"missing speed: {missingSpeed} rb velocity: {_rigidbody.velocity.magnitude} force: {force.magnitude}");
            _rigidbody.AddForce(force, ForceMode.VelocityChange);

            if (_rigidbody.velocity.magnitude > maxMovementSpeed && !NoFrictionLandTimeframeMet())
            {
                _rigidbody.velocity = _rigidbody.velocity.normalized * maxMovementSpeed;
            }
        }

        private void OnDrawGizmosSelected()
        {

            if (!Application.isPlaying) return;
            Gizmos.color = IsGrounded ? Color.green : Color.red;

            var bounds = _capsuleCollider.bounds;

            var toCenter = Vector3.down * (bounds.extents.y / 2);

            Gizmos.DrawWireCube(bounds.center + toCenter + Vector3.down * extraHeight / 2,
                new Vector3(bounds.size.x,
                    bounds.extents.y + extraHeight,
                    bounds.size.z));

            Gizmos.color = Color.blue;
            Gizmos.DrawLine(_hitMovement.point, _hitMovement.point + _hitMovement.normal * 5);
        }

        public void Move(Vector3 direction)
        {
            throw new System.NotImplementedException();
        }

        public void Teleport(Vector3 position, Quaternion rotation)
        {
            _rigidbody.position = position;
            _rigidbody.rotation = rotation;
        }
        
    }
}