using System.Collections.Generic;
using SepCore.CustomUtility;
using SepCore.Definition;
using DG.Tweening;
using UnityEngine;
using UnityGameFramework.Runtime;

namespace SepCore.Entity
{
    public class WeaponKnife : WeaponBase
    {
        private Sequence _attackSequence;
        private Transform _attackParent;
        private Vector3 _attackCenter;

        [SerializeField] private float _attackDuration = 0.15f;
        [SerializeField] private float _returnDuration = 0.2f;
        [SerializeField] private int _maxHitColliders = 32;

        private IWeaponAttackEffect _attackEffect;
        private Collider[] _hitResults;
        private readonly HashSet<int> _hitEntityIds = new();

        public float HitRadius => WeaponData.GetParamFloat(ParamType.HitRadius);

        protected override void BuildStates()
        {
            RegisterState(new WeaponKnifeIdleState());
            RegisterState(new WeaponKnifeAimState());
            RegisterState(new WeaponKnifeSeekState());
            RegisterState(new WeaponKnifeAttackState());
        }

        public override void Attack()
        {
            StopAttackTween(false);
            FaceTargetImmediately();

            _isAttacking = true;
            Transform parentTransform = CachedTransform.parent;
            _attackParent = parentTransform;
            _attackCenter = _target != null ? _target.CachedTransform.position : CachedTransform.position;
            CachedTransform.SetParent(null);

            Vector3 targetPos = CachedTransform.position + CachedTransform.forward * WeaponData.AttackRange;
            _attackSequence = DOTween.Sequence();
            _attackSequence.Append(CachedTransform.DOMove(targetPos, _attackDuration).SetEase(Ease.OutQuad));
            _attackSequence.AppendCallback(() =>
            {
                _attackEffect.Play(this, _attackCenter, null, HitRadius);
                ApplyGroundAreaDamage();
                if (_attackParent != null)
                {
                    CachedTransform.SetParent(_attackParent);
                }
            });
            _attackSequence.Append(
                CachedTransform.DOLocalMove(Vector3.zero, _returnDuration * 0.5f).SetEase(Ease.InQuad));
            _attackSequence.AppendCallback(() =>
            {
                _isAttacking = false;
                _attackSequence = null;
                _attackParent = null;
            });
        }

        private void ApplyGroundAreaDamage()
        {
            float radius = HitRadius;
            if (radius <= 0f) return;

            if (TryQueueAreaCollisionQuery(_attackCenter, radius, Mathf.Max(1, _maxHitColliders)))
            {
                return;
            }

            if (_hitResults == null || _hitResults.Length == 0) return;

            int hitCount = Physics.OverlapSphereNonAlloc(_attackCenter, radius, _hitResults, _hitMask,
                QueryTriggerInteraction.Collide);

            float radiusSqr = radius * radius;
            _hitEntityIds.Clear();
            for (int i = 0; i < hitCount; i++)
            {
                Collider collider = _hitResults[i];
                if (collider == null) continue;

                TargetableObject targetable = collider.GetComponentInParent<TargetableObject>();
                if (targetable == null || !targetable.Available || targetable.IsDead) continue;
                if (!_hitEntityIds.Add(targetable.Id)) continue;

                Vector3 delta = targetable.CachedTransform.position - _attackCenter;
                delta.y = 0f;
                if (delta.sqrMagnitude > radiusSqr) continue;

                AIUtility.PerformCollision(targetable, this);
            }
        }

        protected override bool OnWeaponShow(object userData)
        {
            _attackEffect = new KnifeRangeAttackEffect();

            int colliderCapacity = Mathf.Max(1, _maxHitColliders);
            if (_hitResults == null || _hitResults.Length != colliderCapacity)
            {
                _hitResults = new Collider[colliderCapacity];
            }

            return true;
        }

        protected override void OnWeaponHide(object userData)
        {
            StopAttackTween(true);
            _attackEffect = null;
        }

        protected override void OnWeaponDetach(EntityLogic parentEntity, object userData)
        {
            StopAttackTween(true);
            base.OnWeaponDetach(parentEntity, userData);
        }

        protected override void OnEnabledChanged(bool enabled)
        {
            if (!enabled)
            {
                StopAttackTween(true);
            }
        }

        private void StopAttackTween(bool resetTransform)
        {
            if (_attackSequence != null)
            {
                _attackSequence.Kill();
                _attackSequence = null;
            }

            _isAttacking = false;

            if (resetTransform && _attackParent != null)
            {
                CachedTransform.SetParent(_attackParent);
                CachedTransform.localPosition = Vector3.zero;
            }

            _attackParent = null;
            _hitEntityIds.Clear();
        }
    }
}