using UnityEngine;

using RR.Common.Interfaces;
using RR.Common.Utility;
using RR.Game2D.Core.Managers;
using RR.Game2D.Behaviour.ScriptableObjects;
using RR.Game2D.FX;
using UnityEngine.VFX;

namespace RR.Game2D.Behaviour
{
    [RequireComponent(typeof(Rigidbody2D),
                      typeof(Collider2D),
                      typeof(Animator))]
    public class EnemyController : MonoBehaviour, IDamageable
    {
        [SerializeField] public EnemySFXAsset sfxAsset;
        [SerializeField] private EnemyControllerConfiguration config;
        [Header("FX")]
        [SerializeField] private VisualEffectAsset stompImpactVFX;
        [SerializeField] private string stompImpactVFXResourcePath = "VFX/MVP_Impact_VFX";
        [SerializeField] private float stompImpactVFXLifetime = 1f;
        [SerializeField] private MvpVFXSpawnSettings stompImpactVFXSettings = new MvpVFXSpawnSettings
        {
            spreadRadiusX = 0.2f,
            spreadRadiusY = 0.04f
        };
        
        private Health health;
        [ReadOnlyInInspector] public float CurrentHealth => health?.CurrentHealth ?? 0;
        
        [HideInInspector] public float MaxHealth => health?.MaxHealth ?? 0;

        private Animator _animator;
        private Rigidbody2D _rb;
        private Collider2D _col;
        private bool _isDead;
        
        private GameObject _playerObj;

        // Аниматор
        private static readonly int Speed = Animator.StringToHash("Speed");

        private void Start()
        {
            _rb = GetComponent<Rigidbody2D>();
            _col = GetComponent<Collider2D>();
            _animator = GetComponent<Animator>();

            _playerObj = GameManager.Instance.PlayerObj;
            if (_playerObj == null)
            {
                _playerObj = GameObject.FindGameObjectWithTag("Player");
            }

            health = GetComponent<Health>();
            if (health == null)
            {
                health = gameObject.AddComponent<Health>();
            }
            health.ResetHealth();
            health.SetOwner(this);
            health.SetMaxHealth(config.maxHealth);
        }

        private void FixedUpdate()
        {
            if (!_playerObj) return;
            
            _playerObj.TryGetComponent(out PlayerController playerController);
            
            Vector3 playerCenter = _playerObj.transform.position;

            if (PlayerInSight() && !playerController.isDeadAtMoment)
            {
                
                Vector3 toPlayer = playerCenter - transform.position;
                float dist = toPlayer.magnitude + 0.1f;

                if (dist > 0)
                {
                    _rb.linearVelocity = new Vector2(config.moveSpeed * toPlayer.normalized.x, 0);
                }
                // if (dist > 0)
                //     rb.linearVelocity = toPlayer / dist * moveSpeed;
                // else
                //     rb.linearVelocity = Vector2.zero;
            }
            else
            {
                _rb.linearVelocity = Vector2.MoveTowards(
                    _rb.linearVelocity, Vector2.zero, config.acceleration * Time.fixedDeltaTime);
            }

            _animator.SetFloat(Speed, Mathf.Abs(_rb.linearVelocity.magnitude));
        }

        private void OnCollisionEnter2D(Collision2D collision)
        {
            if (!collision.collider.CompareTag("Player")) return;
            
            Rigidbody2D playerRb = collision.collider.GetComponent<Rigidbody2D>();
            _playerObj.TryGetComponent(out PlayerController playerController);
            if (playerRb == null) return;
            Vector2 contactNormal = collision.GetContact(0).normal;
            
            if (playerController.isDeadAtMoment) return;
            
            if (contactNormal.y < -0.5f)
            {
                playerRb.linearVelocity = new Vector2(playerRb.linearVelocity.x, 35f);
                MvpVFXUtility.Spawn(stompImpactVFX, stompImpactVFXResourcePath, collision.GetContact(0).point, stompImpactVFXLifetime, stompImpactVFXSettings);
                TakeDamage(MaxHealth);
                // TakeDamage(1);
            }
            else
            {
                playerController.TakeDamage(1f);
            }
        }

        private bool PlayerInSight()
        {
            if (!_playerObj) return false;

            Vector3 playerPos = _playerObj.transform.position;
            Collider2D playerCol = _playerObj.GetComponent<Collider2D>();
            playerPos.y = playerCol.bounds.center.y;

            Vector2 eyePos = new(_rb.position.x, _col.bounds.center.y);

            Vector2 toPlayer = (Vector2)playerPos - eyePos;
            float dist = toPlayer.magnitude;
            if (dist > config.viewDistance) return false;

            Vector2 forward = transform.localEulerAngles.y >= 180f ? Vector2.right : Vector2.left;

            float cosHalf = Mathf.Cos(0.5f * config.viewAngle * Mathf.Deg2Rad);
            float dot = Vector2.Dot(forward.normalized, toPlayer / Mathf.Max(dist, 1e-6f));
            if (dot < cosHalf) return false;

            int mask = config.obstacleMask;
            mask &= ~(1 << gameObject.layer);
            mask &= ~(1 << _playerObj.layer);

            Vector2 origin = eyePos + forward.normalized * 0.05f;

            RaycastHit2D hit = Physics2D.Raycast(origin, toPlayer.normalized, dist, mask);
            
            return !hit.collider;
        }

        public void TakeDamage(float amount)
        {
            health.TakeDamage(amount);
        }
        public void Heal(float amount)
        {
            health.Heal(amount);
        }
        public void Die()
        {
            if (_isDead) return;
            _isDead = true;

            _animator.Play("Death");
            // Destroy(gameObject);
        }

#if UNITY_EDITOR
        private void OnDrawGizmos()
        {
            if (!_playerObj) return;

            Vector2 origin = new(_rb.position.x, _col.bounds.center.y);
            Vector2 forward = transform.localEulerAngles.y >= 180f ? Vector2.right : Vector2.left;
            float half = config.viewAngle * 0.5f;

            Vector2 edgeA = (Quaternion.Euler(0, 0, +half) * forward);
            Vector2 edgeB = (Quaternion.Euler(0, 0, -half) * forward);

            Gizmos.color = Color.yellow;
            Gizmos.DrawLine(origin, origin + edgeA * config.viewDistance);
            Gizmos.DrawLine(origin, origin + edgeB * config.viewDistance);
            Gizmos.DrawWireSphere(origin, config.viewDistance);

            Vector2 toPlayer = (Vector2)_playerObj.transform.position - origin;
            
            if (!(toPlayer.magnitude <= config.viewDistance)) return;
            
            Gizmos.color = Color.red;
            Gizmos.DrawLine(transform.position, _playerObj.transform.position);
        }
#endif
    }
}