using System;
using Sirenix.OdinInspector;
using UnityEngine;
using UnityEngine.InputSystem;

// ReSharper disable once CheckNamespace
namespace BlueWaterProject
{
    public class PhysicsMovement : MonoBehaviour
    {
        /***********************************************************************
         *                               Definitions
         ***********************************************************************/

        #region Class

        [Serializable]
        public class Components
        {
            public CapsuleCollider capsuleCollider;
            public Rigidbody rb;
            [ShowIf("@false")]
            public Animator animator;
        }

        [Serializable]
        public class CheckOption
        {
            [Tooltip("지면으로 체크할 레이어 설정")]
            public LayerMask groundLayer = -1;

            [Range(0.01f, 0.5f), Tooltip("전방 감지 거리")]
            public float forwardCheckDistance = 0.1f;

            [Range(0.1f, 10.0f), Tooltip("지면 감지 거리")]
            public float groundCheckDistance = 2.0f;

            [Range(0.0f, 0.5f), Tooltip("지면 인식 허용 거리")]
            public float groundCheckThreshold = 0.01f;
        }

        [Serializable]
        public class MovementOption
        {
            [Range(1f, 10f), Tooltip("이동 속도")]
            public float moveSpeed = 10f;

            [Range(1f, 75f), Tooltip("등반 가능한 경사각")]
            public float maxSlopeAngle = 50f;
            
            [Range(1f, 50f), Tooltip("대쉬 속도")]
            public float dashSpeed = 30f;
            
            [Range(0.1f, 1f), Tooltip("대쉬 시간")]
            public float dashTime = 0.2f;
            
            [Range(0f, 5f), Tooltip("대쉬 쿨타임")]
            public float dashCooldown = 0.5f;
        }
        
        [Serializable]
        [DisableIf("@true")]
        public class CurrentState
        {
            public bool enableMoving = true;
            public bool isMoving;
            public bool isGrounded;
            public bool isOnSlope;
            public bool isOnSteepSlope;
            public bool isForwardBlocked;
            public bool isOutOfControl;
            public bool isDashing;
            public bool enableDash = true;
        }

        [Serializable]
        [DisableIf("@true")]
        public class CurrentValue
        {
            public Vector2 movementInput;
            public Vector3 currentMoveDirection;
            public Vector3 previousMoveDirection = Vector3.back;
            public Vector3 groundNormal;
            public Vector3 groundCross;
            public Vector3 horizontalVelocity;

            [Space]
            public float outOfControlDuration;

            [Space]
            public float groundDistance;
            public float groundSlopeAngle; // 현재 바닥의 경사각
            public float forwardSlopeAngle; // 캐릭터가 바라보는 방향의 경사각

            [Space]
            public Vector3 gravity;
        }

        #endregion

        /***********************************************************************
         *                               Variables
         ***********************************************************************/
        #region Variables
        
        [field: SerializeField] public Components MyComponents { get; private set; } = new();
        [field: SerializeField] public CheckOption MyCheckOption { get; private set; } = new();
        [field: SerializeField] public MovementOption MyMovementOption { get; private set; } = new();
        [field: SerializeField] public CurrentState MyCurrentState { get; set; } = new();
        [field: SerializeField] public CurrentValue MyCurrentValue { get; set; } = new();

        private float capsuleRadiusDifferent;
        private float castRadius;

        private Vector3 CapsuleTopCenterPoint => new(transform.position.x,
            transform.position.y + MyComponents.capsuleCollider.height - MyComponents.capsuleCollider.radius,
            transform.position.z);

        private Vector3 CapsuleBottomCenterPoint => new(transform.position.x,
            transform.position.y + MyComponents.capsuleCollider.radius,
            transform.position.z);
        
        public static readonly int IsDashingHash = Animator.StringToHash("isDashing");

        #endregion

        /***********************************************************************
         *                               Unity Events
         ***********************************************************************/
        #region Unity Events

        private void Start()
        {
            InitRigidbody();
            InitCapsuleCollider();
            InitStartValue();
        }

        private void FixedUpdate()
        {
            if (!MyCurrentState.enableMoving) return;
            
            InputMove();
            CheckGround();
            CheckForward();
            
            UpdateValues();

            CalculateMovements();
            ApplyMovementsToRigidbody();
        }

        #endregion

        /***********************************************************************
         *                               Init Methods
         ***********************************************************************/

        #region Init Methods

        private void InitRigidbody()
        {
            if (TryGetComponent(out MyComponents.rb)) return;
            
            MyComponents.rb = gameObject.AddComponent<Rigidbody>();
            
            MyComponents.rb.constraints = RigidbodyConstraints.FreezeRotation;
            MyComponents.rb.interpolation = RigidbodyInterpolation.Interpolate;
            MyComponents.rb.collisionDetectionMode = CollisionDetectionMode.ContinuousDynamic;
            MyComponents.rb.useGravity = true;
        }

        private void InitCapsuleCollider()
        {
            if (!TryGetComponent(out MyComponents.capsuleCollider))
            {
                MyComponents.capsuleCollider = gameObject.AddComponent<CapsuleCollider>();
                
                MyComponents.capsuleCollider.height = 2f;
                MyComponents.capsuleCollider.center = Vector3.up;
                MyComponents.capsuleCollider.radius = 0.5f;
            }

            var capsuleColliderRadius = MyComponents.capsuleCollider.radius;
            castRadius = capsuleColliderRadius * 0.9f;
            capsuleRadiusDifferent = capsuleColliderRadius - castRadius + 0.05f;
        }

        private void InitStartValue()
        {
            MyCurrentValue.gravity = Physics.gravity;
        }

        #endregion
        
        /***********************************************************************
         *                              PlayerInput
         ***********************************************************************/

        #region PlayerInput

        private void OnMove(InputValue value)
        {
            MyCurrentValue.movementInput = value.Get<Vector2>();
        }
        
        private void OnDash()
        {
            if (!MyCurrentState.enableDash || MyCurrentState.isDashing) return;
            
            MyComponents.animator.SetBool(IsDashingHash, true);
        }

        #endregion

        /***********************************************************************
         *                              Methods
         ***********************************************************************/
        #region Methods

        private void InputMove()
        {
            if (MyCurrentValue.currentMoveDirection != Vector3.zero)
            {
                MyCurrentValue.previousMoveDirection = MyCurrentValue.currentMoveDirection;
            }
            MyCurrentValue.currentMoveDirection = MyCurrentState.isDashing
                ? MyCurrentValue.previousMoveDirection
                : new Vector3(MyCurrentValue.movementInput.x, 0,MyCurrentValue.movementInput.y).normalized;
            MyCurrentState.isMoving = MyCurrentValue.currentMoveDirection != Vector3.zero;
        }

        /// <summary> 하단 지면 검사 </summary>
        private void CheckGround()
        {
            MyCurrentValue.groundDistance = float.MaxValue;
            MyCurrentValue.groundNormal = Vector3.up;
            MyCurrentValue.groundSlopeAngle = 0f;
            MyCurrentValue.forwardSlopeAngle = 0f;

            var groundRaycast = Physics.SphereCast(CapsuleBottomCenterPoint, castRadius,Vector3.down,
                out var hit, MyCheckOption.groundCheckDistance, MyCheckOption.groundLayer, QueryTriggerInteraction.Ignore);

            MyCurrentState.isGrounded = false;

            if (groundRaycast)
            {
                MyCurrentValue.groundNormal = hit.normal;
                MyCurrentValue.groundSlopeAngle = Vector3.Angle(MyCurrentValue.groundNormal, Vector3.up);
                MyCurrentValue.forwardSlopeAngle = Vector3.Angle(MyCurrentValue.groundNormal, MyCurrentValue.currentMoveDirection) - 90f;
                MyCurrentState.isOnSlope = MyCurrentValue.groundSlopeAngle > 0f && MyCurrentValue.groundSlopeAngle < MyMovementOption.maxSlopeAngle;
                MyCurrentState.isOnSteepSlope = MyCurrentValue.groundSlopeAngle >= MyMovementOption.maxSlopeAngle;

                // 경사각 이중검증 (수직 레이캐스트) : 뾰족하거나 각진 부분 체크
                //if (State.isOnSteepSlope)
                //{
                //    Vector3 ro = hit.point + Vector3.up * 0.1f;
                //    Vector3 rd = Vector3.down;
                //    bool rayD = 
                //        Physics.SphereCast(ro, 0.09f, rd, out var hitRayD, 0.2f, COption.groundLayerMask, QueryTriggerInteraction.Ignore);

                //    Current.groundVerticalSlopeAngle = rayD ? Vector3.Angle(hitRayD.normal, Vector3.up) : Current.groundSlopeAngle;

                //    State.isOnSteepSlope = Current.groundVerticalSlopeAngle >= MOption.maxSlopeAngle;
                //}

                MyCurrentValue.groundDistance = Mathf.Max(hit.distance - capsuleRadiusDifferent - MyCheckOption.groundCheckThreshold, 0f);
                MyCurrentState.isGrounded = (MyCurrentValue.groundDistance <= 0.0001f) && !MyCurrentState.isOnSteepSlope;

                GizmosUpdateValue(ref gzGroundTouch, hit.point);
            }
            
            MyCurrentValue.groundCross = Vector3.Cross(MyCurrentValue.groundNormal, Vector3.up);
        }

        /// <summary> 전방 장애물 검사 : 레이어 관계 없이 trigger가 아닌 모든 장애물 검사 </summary>
        private void CheckForward()
        {
            var obstacleRaycast = Physics.CapsuleCast(CapsuleBottomCenterPoint, CapsuleTopCenterPoint, castRadius,
                    MyCurrentValue.currentMoveDirection + Vector3.down * 0.1f,
                    out var hit, MyCheckOption.forwardCheckDistance, -1, QueryTriggerInteraction.Ignore);

            MyCurrentState.isForwardBlocked = false;
            if (obstacleRaycast)
            {
                var forwardObstacleAngle = Vector3.Angle(hit.normal, Vector3.up);
                MyCurrentState.isForwardBlocked = forwardObstacleAngle >= MyMovementOption.maxSlopeAngle;

                GizmosUpdateValue(ref gzForwardTouch, hit.point);
            }
        }

        private void UpdateValues()
        {
            MyCurrentState.isOutOfControl = MyCurrentValue.outOfControlDuration > 0f;

            if (MyCurrentState.isOutOfControl)
            {
                MyCurrentValue.outOfControlDuration -= Time.fixedDeltaTime;
                MyCurrentValue.currentMoveDirection = Vector3.zero;
            }
        }

        private void CalculateMovements()
        {
            if (MyCurrentState.isOutOfControl)
            {
                MyComponents.rb.useGravity = true;
                MyCurrentValue.horizontalVelocity = Vector3.zero;
                return;
            }
            
            var speed = 0f;
            if (MyCurrentState.isDashing)
            {
                speed = MyMovementOption.dashSpeed;
            }
            else
            {
                speed = MyCurrentState.isMoving ? MyMovementOption.moveSpeed : 0f;
            }

            if (MyCurrentState.isOnSlope)
            {
                MyComponents.rb.useGravity = false;

                if (MyCurrentState.isMoving)
                {
                    var changeMoveDirection = Vector3.ProjectOnPlane(MyCurrentValue.currentMoveDirection, MyCurrentValue.groundNormal).normalized;
                    MyCurrentValue.horizontalVelocity = changeMoveDirection * speed;
                }
                else
                {
                    MyCurrentValue.horizontalVelocity = Vector3.zero;
                }
                return;
            }
            
            MyComponents.rb.useGravity = true;
            if (MyCurrentState.isForwardBlocked || !MyCurrentState.isGrounded)
            {
                MyCurrentValue.horizontalVelocity = Vector3.zero;
            }
            else
            {
                MyCurrentValue.horizontalVelocity = MyCurrentValue.currentMoveDirection * speed;
            }
        }

        /// <summary> 리지드바디 최종 속도 적용 </summary>
        private void ApplyMovementsToRigidbody()
        {
            Vector3 finalVelocity;
            if (MyCurrentState.isOutOfControl || MyCurrentState.isOnSteepSlope || !MyCurrentState.isGrounded)
            {
                var velocity = MyComponents.rb.velocity;
                finalVelocity = MyComponents.rb.position + new Vector3(velocity.x, MyCurrentValue.gravity.y, velocity.z) * Time.fixedDeltaTime;
                MyComponents.rb.MovePosition(finalVelocity);
                return;
            }
            if (MyCurrentValue.horizontalVelocity == Vector3.zero)
            {
                MyComponents.rb.velocity = Vector3.zero;
                return;
            }

            finalVelocity = MyComponents.rb.position + MyCurrentValue.horizontalVelocity * Time.fixedDeltaTime;
            MyComponents.rb.MovePosition(finalVelocity);
        }

        public void Move(Vector3 velocity)
        {
            MyComponents.rb.position = velocity;
        }
        
        public void MoveToCurrentDirection(float speed)
        {
            var finalVelocity = MyComponents.rb.position + MyCurrentValue.previousMoveDirection * speed * Time.fixedDeltaTime;
            MyComponents.rb.MovePosition(finalVelocity);
        }

        public void SetEnableMoving(bool value) => MyCurrentState.enableMoving = value;
        public bool GetIsMoving() => MyCurrentState.isMoving;
        public bool GetIsDashing() => MyCurrentState.isDashing;
        public float GetDashCooldown() => MyMovementOption.dashCooldown;
        public float GetDashTime() => MyMovementOption.dashTime;
        public void SetIsDashing(bool value) => MyCurrentState.isDashing = value;
        public void SetEnableDashing(bool value) => MyCurrentState.enableDash = value;
        public Vector3 GetPreviousMoveDirection() => MyCurrentValue.previousMoveDirection;
        public void SetPreviousMoveDirection(Vector3 value) => MyCurrentValue.previousMoveDirection = value;
        public void SetAnimator(Animator animator) => MyComponents.animator = animator;
        public Vector3 GetCurrentPosition() => MyComponents.rb.position;
        public void SetIsTrigger(bool value) => MyComponents.capsuleCollider.isTrigger = value;
        public void SetUseGravity(bool value) => MyComponents.rb.useGravity = value;

        #endregion

        /***********************************************************************
         *                               Gizmos, GUI
         ***********************************************************************/
        #region Gizmos, GUI

        private Vector3 gzGroundTouch;
        private Vector3 gzForwardTouch;

        [Header("Gizmos Option")] public bool showGizmos = true;

        [SerializeField, Range(0.01f, 2f)] private float gizmoRadius = 0.05f;

        [System.Diagnostics.Conditional("UNITY_EDITOR")]
        private void OnDrawGizmos()
        {
            if (Application.isPlaying == false) return;
            if (!showGizmos) return;
            if (!enabled) return;

            Gizmos.color = Color.red;
            Gizmos.DrawSphere(gzGroundTouch, gizmoRadius);

            if (MyCurrentState.isForwardBlocked)
            {
                Gizmos.color = Color.blue;
                Gizmos.DrawSphere(gzForwardTouch, gizmoRadius);
            }

            Gizmos.color = Color.blue;
            Gizmos.DrawLine(gzGroundTouch - MyCurrentValue.groundCross,
                gzGroundTouch + MyCurrentValue.groundCross);

            Gizmos.color = new Color(0.5f, 1.0f, 0.8f, 0.8f);
            Gizmos.DrawWireSphere(CapsuleTopCenterPoint, castRadius);
            Gizmos.DrawWireSphere(CapsuleBottomCenterPoint, castRadius);
        }

        [System.Diagnostics.Conditional("UNITY_EDITOR")]
        private void GizmosUpdateValue<T>(ref T variable, in T value)
        {
            variable = value;
        }

        [SerializeField, Space] private bool showGUI = true;
        [SerializeField] private int guiTextSize = 28;

        private float prevForwardSlopeAngle;

        private void OnGUI()
        {
            if (Application.isPlaying == false) return;
            if (!showGUI) return;
            if (!enabled) return;

            GUIStyle labelStyle = GUI.skin.label;
            labelStyle.normal.textColor = Color.yellow;
            labelStyle.fontSize = Math.Max(guiTextSize, 20);

            prevForwardSlopeAngle = MyCurrentValue.forwardSlopeAngle == -90f
                ? prevForwardSlopeAngle
                : MyCurrentValue.forwardSlopeAngle;

            var oldColor = GUI.color;
            GUI.color = new Color(0f, 0f, 0f, 0.5f);
            GUI.Box(new Rect(40, 40, 420, 240), "");
            GUI.color = oldColor;

            GUILayout.BeginArea(new Rect(50, 50, 1000, 500));
            GUILayout.Label($"Ground Height : {Mathf.Min(MyCurrentValue.groundDistance, 99.99f): 00.00}",
                labelStyle);
            GUILayout.Label($"Slope Angle(Ground)  : {MyCurrentValue.groundSlopeAngle: 00.00}", labelStyle);
            GUILayout.Label($"Slope Angle(Forward) : {prevForwardSlopeAngle: 00.00}", labelStyle);
            GUILayout.Label($"Allowed Slope Angle : {MyMovementOption.maxSlopeAngle: 00.00}", labelStyle);
            GUILayout.Label($"Current Speed Mag  : {MyCurrentValue.horizontalVelocity.magnitude: 00.00}",
                labelStyle);
            GUILayout.EndArea();

            float sWidth = Screen.width;
            float sHeight = Screen.height;

            GUIStyle RTLabelStyle = GUI.skin.label;
            RTLabelStyle.fontSize = 20;
            RTLabelStyle.normal.textColor = Color.green;

            oldColor = GUI.color;
            GUI.color = new Color(1f, 1f, 1f, 0.5f);
            GUI.Box(new Rect(sWidth - 355f, 5f, 340f, 100f), "");
            GUI.color = oldColor;

            var yPos = 10f;
            GUI.Label(new Rect(sWidth - 350f, yPos, 150f, 30f), $"Speed : {MyMovementOption.moveSpeed: 00.00}",
                RTLabelStyle);
            MyMovementOption.moveSpeed = GUI.HorizontalSlider(new Rect(sWidth - 180f, yPos + 10f, 160f, 20f),
                MyMovementOption.moveSpeed, 1f, 10f);

            yPos += 20f;
            GUI.Label(new Rect(sWidth - 350f, yPos, 150f, 30f), $"Max Slope : {MyMovementOption.maxSlopeAngle: 00}",
                RTLabelStyle);
            MyMovementOption.maxSlopeAngle = (int)GUI.HorizontalSlider(
                new Rect(sWidth - 180f, yPos + 10f, 160f, 20f), MyMovementOption.maxSlopeAngle, 1f, 75f);
            
            yPos += 20f;
            GUI.Label(new Rect(sWidth - 350f, yPos, 180f, 30f), $"TimeScale : {Time.timeScale: 0.00}",
                RTLabelStyle);
            Time.timeScale = GUI.HorizontalSlider(
                new Rect(sWidth - 180f, yPos + 10f, 160f, 20f), Time.timeScale, 0f, 1f);
            Time.fixedDeltaTime = 0.02f * Time.timeScale;

            labelStyle.fontSize = Math.Max(guiTextSize, 20);
        }

        #endregion
    }
}