local CastSystem = {}
local _tempV1 = FP.newV1(0)

local SHOVE_DIAMETER_THRESHOLD = FP.newV1(4)
function CastSystem.OnCheckNeedCastWhenAttack(entity, command, skillID)
    if SystemManager.GetSkillKeyPositionBySkillIndex(entity,command.SkillIndex) == LuaConst.NormalSkillKeyPos and  entity._logicInitData.IsPlayer then --玩家
        
        --必须是第一技能的，切追击技能cd好了
        local skillData = entity:GetSkillData(skillID)
        if skillID ~= skillData.BelongTo then
            return skillID
        end

        local castSkillID = entity.components.skillBase.CastSkillID
        if not castSkillID then
            return skillID
        end
        if not entity.components.skillBase.CanUseCastSkill then
            return skillID
        end
        
        local castSkillData = entity:GetSkillData(castSkillID)
        if not entity.components.skillBase:CanUseSkill(castSkillData) then
            return skillID
        end
        
        
        --重新选取目标(用普通技能的数据，不要用追击技数据 - 策划需求)        
        local target = entity.components.target.Target
        

        --目标不为空，且技能配置的目标选择范围大于0时，检测是否需要追击
        if target and skillData and skillData.ChooseRadius > FP.Const.Zero then
            
            local targetPos = target.components.move.LogicPos
            local selfPos = entity.components.move.LogicPos
            local disSqr = FP.V2.SqrMagnitude(targetPos - selfPos)

            -- old↓ 是否释放追击技能考虑了体积半径，后来发现不应该考虑体积半径，否则策划配表容易配错
            -- local shoveDiameter1 = entity.components.base:GetAverageRadius()
            -- local shoveDiameter2 = target.components.base:GetAverageRadius()            
            -- _tempV1:Reset(shoveDiameter1):Add(shoveDiameter2):Div(2):Add(0.5) --  (shoveDiameter1 + shoveDiameter2) / 2 + 0.5 --0.5是格子修正
            -- -- 此时 _tempV1 含义就是原作者的 shoveDist
            -- if _tempV1 >= SHOVE_DIAMETER_THRESHOLD then
            --     _tempV1:Add(skillData.CastRadius)
            --     _tempV1:Mul(_tempV1)
            -- else
            --     _tempV1:Reset(skillData.CastRadius):Mul(skillData.CastRadius)-- skillData.CastRadius * skillData.CastRadius
            -- end
            -- old↑

            --new↓ 不再考虑体积半径
            _tempV1:Reset(skillData.CastRadius):Mul(skillData.CastRadius)
            --new↑

            if disSqr > _tempV1 then
                command.MoveDir = targetPos - selfPos
                command.RotateDir:Reset(command.MoveDir)
                skillID = castSkillID
            end
        end
    end
    
    return skillID
end



return CastSystem