using Cysharp.Threading.Tasks;
using SepCore.AsyncTask;
using SepCore.CustomUtility;
using SepCore.Definition;
using UnityEngine;
using UnityGameFramework.Runtime;

namespace SepCore.Entity
{
    public class RemoteEnemy : EnemyBase
    {
        private float _attackRangeSquared;

        protected override void OnShow(object userData)
        {
            base.OnShow(userData);

            _attackRangeSquared = AttackRange * AttackRange;
        }

        protected override void OnUpdate(float elapseSeconds, float realElapseSeconds)
        {
            base.OnUpdate(elapseSeconds, realElapseSeconds);

            if (_target == null)
            {
                Movement.SetMove(false);
                return;
            }

            Vector3 toTarget = _target.position - CachedTransform.position;
            toTarget.y = 0f;
            float distanceSquared = toTarget.sqrMagnitude;
            if (distanceSquared <= _attackRangeSquared)
            {
                Movement.SetMove(false);
                if (_canAttack)
                {
                    TryFireProjectile();
                    ResetAttackCooldown(AttackCooldown);
                }
            }
            else
            {
                Movement.SetMove(true);
                Movement.SetDirection(GetTargetDirection());
            }
        }

        private void TryFireProjectile()
        {
            string groupName = GameEntry.Luban.Global.ProjectileGroupName;
            if (!GameEntry.Entity.HasEntityGroup(groupName))
            {
                Log.Error("Entity group '{0}' does not exist.", groupName);
                return;
            }

            float spawnHeight = GameEntry.Luban.Global.ProjectileHeightOffset / 1000f;
            Vector3 spawnPosition = CachedTransform.position + Vector3.up * spawnHeight;
            Vector3 direction = _target.position - spawnPosition;
            direction.y = 0f;
            if (direction.sqrMagnitude <= Mathf.Epsilon)
            {
                direction = CachedTransform.forward;
                direction.y = 0f;
            }

            if (direction.sqrMagnitude <= Mathf.Epsilon)
            {
                direction = Vector3.forward;
            }
            else
            {
                direction.Normalize();
            }

            GameEntry.Entity.ShowProjectile(Id, EnemyData.Camp, AttackDamage, spawnPosition, direction).Forget();
        }
    }
}