using BehaviorDesigner.Runtime.Tasks;
using Cysharp.Threading.Tasks;
using Gameplay.BT.Variables;
using Gameplay.Unit;
using Gameplay.AI;
using Framework;

namespace Code.Scripts.Gameplay.BT.Task
{
    public class BTMoveTo : Action
    {
        public SharedBattleInfo SharedBattleInfo;
        private GameUnit _owner;
        private GameUnit _target;
        private uint _lastTarget;
        
        private bool _needAvoidCheck;
        private float _avoidCheckTimer;
        private float _currentAvoidDelay;
        private const float MIN_AVOID_DELAY = 0f;
        private const float MAX_AVOID_DELAY = 1f;

        public override void OnStart()
        {
            _owner = GameUnitManager.instance.infightUnits.Search(SharedBattleInfo.Value.ownerID);
        }

        public override TaskStatus OnUpdate()
        {
            if (_owner == null) return TaskStatus.Failure;

            // 避开其他AI
            AvoidOtherUnit();

            if (SharedBattleInfo.Value.targetID != Constants.INVALID_UINT_ID)
            {
                if (_lastTarget != SharedBattleInfo.Value.targetID && !AIUtils.IsNeedStop(_owner))
                {
                    _lastTarget = SharedBattleInfo.Value.targetID;
                    if (GameUnitManager.instance.infightUnits.Contains(SharedBattleInfo.Value.targetID))
                    {
                        var target =
                            GameUnitManager.instance.infightUnits.Search(SharedBattleInfo.Value.targetID);
                        if (target != null)
                        {
                            AIUtils.CheckAndMove(_owner, target.transData.cellIndex);
                        }
                    }
                }

                if (_owner?.controlData.targetEnemy == null)
                {
                    _lastTarget = Constants.INVALID_UINT_ID;
                }

                return TaskStatus.Running;
            }

            return TaskStatus.Failure;
        }

        private void AvoidOtherUnit()
        {
            if (AIUtils.IsNeedStop(_owner)) return;

            if (_owner.statusData.isMoveing && !_needAvoidCheck)
            {
                _needAvoidCheck = true;
                _currentAvoidDelay = UnityEngine.Random.Range(MIN_AVOID_DELAY, MAX_AVOID_DELAY);
                _avoidCheckTimer = 0f;
            }

            if (_needAvoidCheck && !_owner.statusData.isMoveing &&
                _owner.controlData.targetCellIndex == -1)
            {
                _avoidCheckTimer += UnityEngine.Time.deltaTime;
                if(_avoidCheckTimer >= _currentAvoidDelay)
                {
                    _needAvoidCheck = false;
                    AIUtils.CheckAreaIsOtherEnemyUnit(_owner, SharedBattleInfo.Value.targetID);
                }
            }
        }
    }
}