using System;
using RR.Game2D.Behaviour;
using RR.Game2D.FX;
using UnityEngine;
using UnityEngine.VFX;

namespace RR.Common.Entities.Props
{
    [RequireComponent(typeof(Collider2D))]
    public abstract class EnvironmentalCollectibleBase : MonoBehaviour
    {
        [SerializeField] private int points = 1;
        [SerializeField] private string playerTag = "Player";
        [Tooltip("Время жизни в секундах. 0 или меньше — бесконечно.")]
        [SerializeField] private float defaultLifetime;
        [Header("FX")]
        [SerializeField] private VisualEffectAsset collectVFX;
        [SerializeField] private string collectVFXResourcePath = "VFX/MVP_PickupSparkle_VFX";
        [SerializeField] private float collectVFXLifetime = 1f;
        [SerializeField] private MvpVFXSpawnSettings collectVFXSettings = new MvpVFXSpawnSettings
        {
            spreadRadiusX = 0.08f,
            spreadRadiusY = 0.08f
        };

        private bool _collected;
        private int _defaultPoints;
        private float _defaultLifetimeBackup;
        private float _lifetime;
        private float _age;
        private Collider2D _trigger;
        private Vector3 _spawnPosition;

        public event Action<EnvironmentalCollectibleBase> Collected;

        public int Points => points;
        public Vector3 SpawnPosition => _spawnPosition;
        public virtual bool CountsTowardsSharedCollectionLimit => false;

        protected virtual void Awake()
        {
            _defaultPoints = Mathf.Max(0, points);
            _defaultLifetimeBackup = defaultLifetime;
            _trigger = GetComponent<Collider2D>();
            ValidateTrigger();
        }

        protected virtual void Update()
        {
            float dt = Time.deltaTime;

            if (_lifetime > 0f && !_collected)
            {
                _age += dt;
                if (_age >= _lifetime)
                {
                    Despawn();
                    return;
                }
            }

            TickBehaviour(dt);
        }

        protected virtual void OnValidate()
        {
            if (points < 0) points = 0;
            _defaultPoints = points;
            _defaultLifetimeBackup = defaultLifetime;
            ValidateTrigger();
        }

        private void OnTriggerEnter2D(Collider2D other)
        {
            // Unity 2D trigger callbacks usually require at least one of the colliding objects to have a Rigidbody2D.
            if (_collected || other == null) return;
            if (!other.CompareTag(playerTag)) return;

            Collect(other.transform);
        }

        public void InitializeForSpawn(
            Vector3 spawnPosition,
            int? pointsOverride,
            float? lifetimeOverride = null)
        {
            _spawnPosition = spawnPosition;
            points = pointsOverride.HasValue ? Mathf.Max(0, pointsOverride.Value) : _defaultPoints;
            _lifetime = lifetimeOverride.HasValue ? lifetimeOverride.Value : _defaultLifetimeBackup;
            _age = 0f;

            ResetStateForReuse();
        }

        public void ResetStateForReuse()
        {
            _collected = false;
            _age = 0f;
            _spawnPosition = transform.position;
            OnSpawned();
        }

        protected void Collect(Transform collector)
        {
            if (_collected) return;

            _collected = true;
            MvpVFXUtility.Spawn(collectVFX, collectVFXResourcePath, transform.position, collectVFXLifetime, collectVFXSettings);
            OnCollected();

            if (CountsTowardsSharedCollectionLimit)
            {
                ScoreSystem.Instance?.RegisterSharedEnvironmentalCollectibleCollected(points);
            }
            else if (points > 0)
            {
                ScoreSystem.Instance?.RegisterEnvironmentalPoints(points);
            }

            Collected?.Invoke(this);
            Destroy(gameObject);
        }

        /// <summary>
        /// Деспаун по истечении времени жизни — без начисления очков.
        /// </summary>
        private void Despawn()
        {
            if (_collected) return;
            _collected = true;

            OnDespawned();


            Collected?.Invoke(this);
            Destroy(gameObject);
        }

        protected virtual void OnSpawned()
        {
        }

        protected virtual void OnCollected()
        {
        }

        protected virtual void OnDespawned()
        {
        }

        protected abstract void TickBehaviour(float dt);

        private void ValidateTrigger()
        {
            if (_trigger == null)
                _trigger = GetComponent<Collider2D>();

            if (_trigger == null)
            {
                Debug.LogError($"[{nameof(EnvironmentalCollectibleBase)}] Missing Collider2D on {name}.", this);
                return;
            }

            if (!_trigger.isTrigger)
                Debug.LogError($"[{nameof(EnvironmentalCollectibleBase)}] Collider2D on {name} must have isTrigger enabled.", this);
        }
    }
}