using System;
using Gameplay;
using Framework;
using Gameplay.AI;
using UnityEngine;
using Gameplay.Unit;
using Gameplay.Level;
using Gameplay.BT.Variables;
using BehaviorDesigner.Runtime.Tasks;
using Action = BehaviorDesigner.Runtime.Tasks.Action;

public class BTMoveAroundTo : Action
{
    public SharedBattleInfo SharedBattleInfo;
    private GameUnit _owner;
    private GameUnit _target;
    private Map _map;
    private EStage _stage = EStage.None;
    private int _stageTargetCellIndex = -1;
    private int _targetCellIndex = -1;
    private int _targetAttackDistance;

    private PosDirection posDirection;
    private Vector2Int targetV2;
    private Vector2Int ownerV2;

    private uint _lastTarget;

    private enum PosDirection
    {
        Left,
        Right,
    }

    private enum EStage
    {
        None,
        Stage1,
        Stage2,
        MoveToTarget
    }

    public override void OnStart()
    {
        var level = LevelManager.Instance.CurrentLevel;
        _map = level?.Map;
        UpdateEnemyData();
        posDirection = targetV2.y > ownerV2.y ? PosDirection.Left : PosDirection.Right;
    }

    private void UpdateEnemyData()
    {
        _owner = GameUnitManager.instance.infightUnits.Search(SharedBattleInfo.Value.ownerId);
        _target = GameUnitManager.instance.infightUnits.Search(SharedBattleInfo.Value.theChosenOneId);
        _targetAttackDistance = _target.fightData.attackDistance;
        _stage = EStage.None;
        _stageTargetCellIndex = -1;
        _targetCellIndex = -1;

        if (_map != null && _target != null && _owner != null)
        {
            targetV2 = _map.TGSCellIndex2BlockPosition(_target.transData.cellIndex);
            ownerV2 = _map.TGSCellIndex2BlockPosition(_owner.transData.cellIndex);
        }
    }

    public override TaskStatus OnUpdate()
    {
        if (SharedBattleInfo.Value.theChosenOneId != Constants.INVALID_UINT_ID)
        {
            if (_owner?.controlData.targetEnemy == null && _stage == EStage.MoveToTarget)
            {
                var enemy = GameUnitManager.instance.infightUnits.Search(SharedBattleInfo.Value.theChosenOneId);
                if (enemy != null && !enemy.statusData.isDead)
                {
                    _target = enemy;
                    _targetCellIndex = enemy.transData.cellIndex;
                    _stage = EStage.None;
                }
                else
                {
                    SharedBattleInfo.Value.theChosenOneId = Constants.INVALID_UINT_ID;
                }
            }

            if (HasTargetMoved())
            {
                RememberTarget();

                switch (_stage)
                {
                    case EStage.None:
                        _stageTargetCellIndex = GetStage1TargetCell();
                        _stage = EStage.Stage1;
                        AIUtils.CheckAndMove(_owner, _stageTargetCellIndex);
                        break;

                    case EStage.Stage1:
                        _stageTargetCellIndex = GetStage1TargetCell();
                        AIUtils.CheckAndMove(_owner, _stageTargetCellIndex);
                        break;

                    case EStage.Stage2:
                        _stageTargetCellIndex = GetStage2TargetCell();
                        AIUtils.CheckAndMove(_owner, _stageTargetCellIndex);
                        break;

                    case EStage.MoveToTarget:
                        break;

                    default:
                        throw new ArgumentOutOfRangeException();
                }

                return TaskStatus.Running;
            }

            if (HasStageArrived() && !AIUtils.IsNeedStop(_owner))
            {
                switch (_stage)
                {
                    case EStage.Stage1:
                        _stageTargetCellIndex = GetStage2TargetCell();
                        _stage = EStage.Stage2;
                        AIUtils.CheckAndMove(_owner, _stageTargetCellIndex);
                        break;

                    case EStage.Stage2:
                        _stageTargetCellIndex = _target.transData.cellIndex;
                        _stage = EStage.MoveToTarget;
                        AIUtils.CheckAndMove(_owner, _stageTargetCellIndex, false);
                        break;
                }
            }

            return TaskStatus.Running;
        }

        return TaskStatus.Failure;
    }

    private int GetStage1TargetCell()
    {
        // 竖轴移动 默认逆时针
        var curDistance = MapUtils.Distance(_map, targetV2, ownerV2);
        var targetCellIndex = _owner.transData.cellIndex;
        // 在攻击范围内 先移出攻击范围
        if (curDistance <= _targetAttackDistance)
        {
            // 方位在右边
            // 顺时针 +x 逆时针-x
            if (posDirection == PosDirection.Right) //(ownerV2.y >= targetV2.y)
            {
                var targetX = targetV2.x + _targetAttackDistance + 1;
                while (targetX >= _map.MapData.Height)
                {
                    targetX--;
                }

                var newPos = new Vector2Int(targetX, ownerV2.y);
                var newIndex = _map.BlockPosition2TGSCellIndex(newPos);
                targetCellIndex = AIUtils.CheckAndGetCanPassOneCycleCellIndex(_map, _owner, newIndex);
            }
            // 方位在左边
            else
            {
                var targetX = targetV2.x - _targetAttackDistance - 1;
                while (targetX < 0)
                {
                    targetX++;
                }

                var newPos = new Vector2Int(targetX, ownerV2.y);
                var newIndex = _map.BlockPosition2TGSCellIndex(newPos);
                
                targetCellIndex = AIUtils.CheckAndGetCanPassOneCycleCellIndex(_map, _owner, newIndex);
            }
        }

        // DebugUtil.LogError("阶段一找到的位置是：{0}", targetCellIndex);
        return targetCellIndex;
    }

    // TODO 多余走了好几步 能攻击就停下
    private int GetStage2TargetCell()
    {
        // 横轴移动 改变y值

        targetV2 = _map.TGSCellIndex2BlockPosition(_target.transData.cellIndex);
        ownerV2 = _map.TGSCellIndex2BlockPosition(_owner.transData.cellIndex);

        var targetY = ownerV2.y;
        if (posDirection == PosDirection.Right)
        {
            while (targetV2.y - 1 <= targetY)
            {
                targetY--;
            }
        }
        else
        {
            while (targetV2.y + 1 >= targetY)
            {
                targetY++;
            }
        }

        var newPos = new Vector2Int(ownerV2.x, targetY);
        var newIndex = _map.BlockPosition2TGSCellIndex(newPos);
        var targetCellIndex = AIUtils.CheckAndGetCanPassOneCycleCellIndex(_map, _owner, newIndex);

       // DebugUtil.LogError("阶段二找到的位置是：{0}", targetCellIndex);
        return targetCellIndex;
    }

    private bool HasTargetMoved()
    {
        return _targetCellIndex != _target.transData.cellIndex;
    }

    private void RememberTarget()
    {
        _targetCellIndex = _target.transData.cellIndex;
    }

    private bool HasStageArrived()
    {
        return _stageTargetCellIndex == _owner?.transData.cellIndex;
    }
}