using System;
using System.Collections;
using UnityEngine;
using UnityEngine.InputSystem;
using Vector2 = UnityEngine.Vector2;
using Vector3 = UnityEngine.Vector3;

namespace DDD
{
    public class RestaurantPlayerMovement : RestaurantCharacterMovement
    {
        #region Fields

        private Rigidbody _rigidbody;
        private BoxCollider _boxCollider;
        private RestaurantPlayerDataSo _playerDataSo;

        private Vector3 _inputDirection;
        private Vector3 _currentDirection;
        private Vector3 _currentVelocity;

        private bool _isMoving;
        private bool _isDashing;
        private bool _isDashCooldown;
        private bool _isInitialized;

        public Action<bool> OnMoving;
        public Action<float> OnDashing;

#if UNITY_EDITOR
        private MovementDebugVisualizer _debugVisualizer;
#endif

        #endregion

        #region Unity Lifecycle

        private void Awake()
        {
            InitializeComponents();
        }

        private async void Start()
        {
            await InitializePlayerData();
        }

        private void FixedUpdate()
        {
            if (!_isInitialized) return;

            HandleMovement();

#if UNITY_EDITOR
            HandleDebugVisualization();
#endif
        }

        private void OnDestroy()
        {
            UnsubscribeFromInputEvents();
        }

        #endregion

        #region Initialization

        private void InitializeComponents()
        {
            _rigidbody = GetComponent<Rigidbody>();
            _boxCollider = GetComponent<BoxCollider>();

#if UNITY_EDITOR
            _debugVisualizer = new MovementDebugVisualizer(transform);
#endif
        }

        private async System.Threading.Tasks.Task InitializePlayerData()
        {
            try
            {
                _playerDataSo =
                    await AssetManager.LoadAsset<RestaurantPlayerDataSo>(DataConstants.RestaurantPlayerDataSo);
                SubscribeToInputEvents();
                _isInitialized = true;
            }
            catch (Exception e)
            {
                Debug.LogError($"Player data load failed\n{e}");
            }
        }

        private void SubscribeToInputEvents()
        {
            _playerDataSo.MoveActionReference.action.performed += OnMove;
            _playerDataSo.MoveActionReference.action.canceled += OnMove;
            _playerDataSo.DashActionReference.action.performed += OnDash;
        }

        private void UnsubscribeFromInputEvents()
        {
            if (!_playerDataSo) return;

            _playerDataSo.MoveActionReference.action.performed -= OnMove;
            _playerDataSo.MoveActionReference.action.canceled -= OnMove;
            _playerDataSo.DashActionReference.action.performed -= OnDash;
        }

        #endregion

        #region Movement

        private void HandleMovement()
        {
            if (CanMove())
            {
                Move();
            }
        }

        public override bool CanMove()
        {
            return base.CanMove() && _playerDataSo.IsMoveEnabled && !_isDashing;
        }

        private void Move()
        {
            SetCurrentDirection(_inputDirection);
            UpdateMovementState();
            UpdateVelocity();
            ApplyVelocity();
        }

        private void UpdateMovementState()
        {
            _isMoving = _inputDirection != Vector3.zero;
            OnMoving?.Invoke(_isMoving);
        }

        private void UpdateVelocity()
        {
            if (_isMoving)
            {
                Vector3 slideDirection = GetSlideAdjustedDirection(_inputDirection.normalized);
                Vector3 targetVelocity = slideDirection * _playerDataSo.MoveSpeed;
                _currentVelocity = Vector3.MoveTowards(_currentVelocity, targetVelocity,
                    _playerDataSo.Acceleration * Time.fixedDeltaTime);
            }
            else
            {
                _currentVelocity = Vector3.MoveTowards(_currentVelocity, Vector3.zero,
                    _playerDataSo.Deceleration * Time.fixedDeltaTime);
            }
        }

        private void ApplyVelocity()
        {
            _rigidbody.linearVelocity = _currentVelocity;
        }

        #endregion

        #region Dash

        private void OnDash(InputAction.CallbackContext context)
        {
            if (CanDash())
            {
                StartCoroutine(DashCoroutine());
            }
        }

        private bool CanDash() => _playerDataSo.IsDashEnabled && !_isDashing && !_isDashCooldown;

        private IEnumerator DashCoroutine()
        {
            StartDash();
            yield return new WaitForSeconds(_playerDataSo.DashTime);
            EndDash();
            yield return new WaitForSeconds(_playerDataSo.DashCooldown);
            ResetDashCooldown();
        }

        private void StartDash()
        {
            _isDashing = true;
            _isDashCooldown = true;
            OnDashing?.Invoke(_playerDataSo.DashTime);

            Vector3 slideDashDirection = GetSlideAdjustedDirection(_currentDirection.normalized);
            _rigidbody.linearVelocity = slideDashDirection * _playerDataSo.DashSpeed;
        }

        private void EndDash()
        {
            _isDashing = false;
        }

        private void ResetDashCooldown()
        {
            _isDashCooldown = false;
        }

        #endregion

        #region Public Methods

        private void SetCurrentDirection(Vector3 normalDirection)
        {
            if (_inputDirection == Vector3.zero) return;
            _currentDirection = normalDirection;
        }

        public Vector3 GetCurrentDirection() => _currentDirection;

        #endregion

        #region Input Handling

        private void OnMove(InputAction.CallbackContext context)
        {
            Vector2 movementInput = context.ReadValue<Vector2>();
            _inputDirection = new Vector3(movementInput.x, 0f, movementInput.y);
        }

        #endregion

        #region Collision Handling

        private Vector3 GetSlideAdjustedDirection(Vector3 inputDirection)
        {
            if (!TryGetCollisionInfo(inputDirection, out RaycastHit hit)) return inputDirection;

            Vector3 slide = Vector3.ProjectOnPlane(inputDirection, hit.normal).normalized;
            float slideFactor = CalculateSlideFactor(inputDirection, hit.normal);

            return slideFactor < _playerDataSo.MinSlideFactorThreshold ? Vector3.zero : slide * slideFactor;
        }

        private bool TryGetCollisionInfo(Vector3 direction, out RaycastHit hit)
        {
            Vector3 origin = _boxCollider.bounds.center;
            Vector3 halfExtents = _boxCollider.bounds.extents;
            float distance = Mathf.Min(_boxCollider.bounds.size.x, _boxCollider.bounds.size.z);
            int layerMask = ~_playerDataSo.IgnoreSlidingLayerMask;

            return Physics.BoxCast(origin, halfExtents * _playerDataSo.BoxCastExtentScale,
                direction, out hit, transform.rotation, distance, layerMask, QueryTriggerInteraction.Ignore);
        }

        private float CalculateSlideFactor(Vector3 direction, Vector3 normal)
        {
            float dot = Vector3.Dot(direction.normalized, normal);
            return Mathf.Pow(1f - Mathf.Abs(dot), _playerDataSo.SlidingThreshold);
        }

        #endregion

#if UNITY_EDITOR
        private void HandleDebugVisualization()
        {
            if (_playerDataSo.IsDrawLineDebug)
            {
                _debugVisualizer.UpdateVisualization(transform.position, _inputDirection,
                    _currentVelocity, _playerDataSo);
            }
        }
#endif
    }

#if UNITY_EDITOR
    public class MovementDebugVisualizer
    {
        private const string InputDebugLineRenderer = "DebugLine_Input";
        private const string VelocityDebugLineRenderer = "DebugLine_Velocity";
        private const string SpriteDefaultShader = "Sprites/Default";

        private LineRenderer _inputLineRenderer;
        private LineRenderer _velocityLineRenderer;
        private readonly Transform _transform;

        public MovementDebugVisualizer(Transform transform)
        {
            _transform = transform;
        }

        public void UpdateVisualization(Vector3 position, Vector3 inputDirection,
            Vector3 currentVelocity, RestaurantPlayerDataSo playerDataSo)
        {
            UpdateInputLine(position, inputDirection, playerDataSo);
            UpdateVelocityLine(position, currentVelocity, playerDataSo);
        }

        private void UpdateInputLine(Vector3 origin, Vector3 inputDirection, RestaurantPlayerDataSo playerDataSo)
        {
            if (inputDirection != Vector3.zero)
            {
                var target = origin + inputDirection.normalized * playerDataSo.InputLineLength;

                if (_inputLineRenderer == null)
                {
                    _inputLineRenderer = CreateDebugLineRenderer(
                        InputDebugLineRenderer,
                        playerDataSo.InputLineSortingOrder,
                        playerDataSo.InputLineWidth,
                        Color.blue);
                }

                UpdateLineRenderer(_inputLineRenderer, origin, target);
                _inputLineRenderer.enabled = true;
            }
            else if (_inputLineRenderer != null)
            {
                _inputLineRenderer.enabled = false;
            }
        }

        private void UpdateVelocityLine(Vector3 origin, Vector3 velocity, RestaurantPlayerDataSo playerDataSo)
        {
            float speed = velocity.magnitude;
            if (speed > playerDataSo.VelocityMinThreshold)
            {
                Vector3 target = origin + velocity.normalized * (speed * playerDataSo.VelocityLineScale);

                if (_velocityLineRenderer == null)
                {
                    _velocityLineRenderer = CreateDebugLineRenderer(
                        VelocityDebugLineRenderer,
                        playerDataSo.VelocityLineSortingOrder,
                        playerDataSo.VelocityLineWidth,
                        Color.red);
                }

                UpdateLineRenderer(_velocityLineRenderer, origin, target);
                _velocityLineRenderer.enabled = true;
            }
            else if (_velocityLineRenderer != null)
            {
                _velocityLineRenderer.enabled = false;
            }
        }

        private LineRenderer CreateDebugLineRenderer(string name, int sortingIndex, float width, Color color)
        {
            Transform existing = _transform.Find(name);
            if (existing != null)
            {
                var lr = existing.GetComponent<LineRenderer>();
                if (lr != null)
                {
                    lr.startColor = lr.endColor = color;
                    return lr;
                }
            }

            var newGameObject = new GameObject(name);
            newGameObject.transform.SetParent(_transform);
            newGameObject.transform.localPosition = Vector3.zero;

            var lineRenderer = newGameObject.AddComponent<LineRenderer>();
            lineRenderer.positionCount = 2;
            lineRenderer.material = new Material(Shader.Find(SpriteDefaultShader));
            lineRenderer.sortingOrder = sortingIndex;
            lineRenderer.startWidth = lineRenderer.endWidth = width;
            lineRenderer.startColor = lineRenderer.endColor = color;
            lineRenderer.useWorldSpace = true;

            return lineRenderer;
        }

        private void UpdateLineRenderer(LineRenderer lr, Vector3 start, Vector3 end)
        {
            lr.SetPosition(0, start);
            lr.SetPosition(1, end);
        }
    }
#endif
}