using System;
using Framework;
using Gameplay.Area;
using Gameplay.Unit;
using Gameplay.Unit.Data;
using Gameplay.Vehicle.Impl;
namespace Gameplay.Buff
{
    public class BuffChangeReadyArea : BaseBuff
    {

        private NormalVehicle _vehicle;
        private int _oldRange;

        protected override void _OnAdd()
        {
            base._OnAdd();
            
            _vehicle = owner as NormalVehicle;
            if (_vehicle == null)
            {
                throw new Exception("该buff只能给载具添加: " + configData.ID);
            }
            
            _oldRange = _vehicle.aroundReadyRange;

            var range = _TryGetIntParam(0);
            _vehicle.aroundReadyRange = range;
            
            // 修改上阵区域
            AreaManager.instance.readyAreaManager.isVehicleBuffActive = true;
            AreaManager.instance.readyAreaManager.followVehicle = _vehicle;
            
            EventManager.Instance.Register<GameUnit>(EventManager.EventName.INFIGHT_UNIT_READY, _OnUnitEnterBattle);
        }

        private void _OnUnitEnterBattle(GameUnit unit)
        {
            // 仅监听己方
            if (unit.commonData.troopId != owner.commonData.troopId)
            {
                return;
            }
            
            // 仅监听角色
            if (unit.gameunitType != EGameUnitType.Character)
            {
                return;
            }
            
            var unitCellIndex = unit.transData.cellIndex;
            var vehicleCellIndex = owner.transData.cellIndex;
            var distance = AreaManager.instance.GetDistance(unitCellIndex, vehicleCellIndex);
            if (distance > _vehicle.aroundReadyRange)
            {
                return;
            }
            
            // 标记为删除
            owner.buffManager.AddNeedRemoveBuff(this);
        }

        protected override void _OnRemove()
        {
            base._OnRemove();
            // 恢复上阵区域
            _vehicle.aroundReadyRange = _oldRange;
            AreaManager.instance.readyAreaManager.isVehicleBuffActive = false;
            
            EventManager.Instance.Unregister<GameUnit>(EventManager.EventName.INFIGHT_UNIT_READY, _OnUnitEnterBattle);
            
            AreaManager.instance.readyAreaManager.isVehicleBuffActive = false;
        }

    }
}