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

namespace SepCore.Entity
{
    public class WeaponSlash : WeaponBase
    {
        #region Property

        private Sequence _attackSequence;
        private Vector3 _attackCenter;
        private Quaternion _cachedAttackRotation;
        private IWeaponAttackEffect _attackEffect;

        [SerializeField] private float _attackDuration = 0.4f;
        [SerializeField] private float _returnDuration = 0.4f;
        [SerializeField] private float _swingAngleScale = 1f;

        [SerializeField] private int _maxHitColliders = 32;

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

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

        #endregion

        protected override void BuildStates()
        {
            RegisterState(new WeaponSlashIdleState());
            RegisterState(new WeaponSlashAimState());
            RegisterState(new WeaponSlashSeekState());
            RegisterState(new WeaponSlashAttackState());
        }

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

            _isAttacking = true;
            _attackCenter = CachedTransform.position;
            _cachedAttackRotation = CachedTransform.rotation;

            float swingAngle = Mathf.Clamp(SectorAngle * Mathf.Max(0.1f, _swingAngleScale), 15f, 170f);
            Quaternion startRotation = Quaternion.AngleAxis(-swingAngle * 0.5f, Vector3.up) * _cachedAttackRotation;
            Quaternion endRotation = Quaternion.AngleAxis(swingAngle * 0.5f, Vector3.up) * _cachedAttackRotation;
            CachedTransform.rotation = startRotation;

            _attackSequence = DOTween.Sequence();
            _attackSequence.Append(
                CachedTransform.DORotateQuaternion(endRotation, _attackDuration).SetEase(Ease.OutSine));
            _attackSequence.InsertCallback(_attackDuration * 0.5f, () =>
            {
                _attackEffect.Play(this, _attackCenter, _target, CurrentAttackRange);
                ApplySectorDamage();
            });
            _attackSequence.Append(CachedTransform.DORotateQuaternion(_cachedAttackRotation, _returnDuration)
                .SetEase(Ease.InSine));
            _attackSequence.AppendCallback(() =>
            {
                _isAttacking = false;
                _attackSequence = null;
            });
        }

        private void ApplySectorDamage()
        {
            float attackRadius = CurrentAttackRange;
            if (attackRadius <= 0f) return;

            Vector3 forward = CachedTransform.forward;
            forward.y = 0f;
            if (forward.sqrMagnitude <= Mathf.Epsilon)
            {
                forward = Vector3.forward;
            }

            forward.Normalize();
            float halfAngle = SectorAngle * 0.5f;
            if (TryQueueSectorCollisionQuery(_attackCenter, attackRadius, in forward, halfAngle,
                    Mathf.Max(1, _maxHitColliders)))
            {
                return;
            }

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

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

            float attackRadiusSqr = attackRadius * attackRadius;
            _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 toTarget = targetable.CachedTransform.position - _attackCenter;
                toTarget.y = 0f;

                float sqrDistance = toTarget.sqrMagnitude;
                if (sqrDistance <= Mathf.Epsilon || sqrDistance > attackRadiusSqr) continue;

                float angle = Vector3.Angle(forward, toTarget.normalized);
                if (angle > halfAngle) continue;

                AIUtility.PerformCollision(targetable, this);
            }
        }

        #region Lifecycle

        protected override bool OnWeaponShow(object userData)
        {
            _cachedAttackRotation = _cachedRotation;

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

            _attackEffect = new SlashSectorAttackEffect();
            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);
            }
        }

        #endregion

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

            _isAttacking = false;

            if (resetTransform)
            {
                CachedTransform.rotation = _cachedAttackRotation;
            }

            _hitEntityIds.Clear();
        }
    }
}