--移动
local HitSystem = {}
local private = {}
local FP=FP
local tempFPV2 = FP.newV2(0,1)
local tempTime = FP.newV1(0)
local LuaConst=LuaConst
--[[
	HitPush
--]]
function HitSystem.OnHitPush(entity, attacker, missile, duration, distance ,hitMoveDir,hitMoveDirOffsetAngle)
    if distance < FP.Const.Zero or attacker == nil then
        return
    end
    --↓策划要的特需：怪没死，就不能被推散 （手雷爆炸也不行）
    --if hitMoveDir > 0 and entity:IsAlive() then
    --    hitMoveDir = LuaConst.MissileHitMoveDirType.Missile
    --end
    --↑特需
    
    local hitComponent = entity.components.hit
    entity.components.buff.CurrentBuffHitType = LuaConst.BuffHitType.HitPush
    local delta = LuaConst.TimeSpanMs / duration
    if hitMoveDir == LuaConst.MissileHitMoveDirType.Missile then
        tempFPV2:Reset(missile.MoveDir)
    elseif hitMoveDir == LuaConst.MissileHitMoveDirType.Away then
        tempFPV2:Reset(entity.components.move.LogicPos):Sub(attacker.components.move.LogicPos)
        if tempFPV2 == FP.Const.Vector2_Zero then
            tempFPV2:Reset(missile.MoveDir)
        end
    elseif hitMoveDir == LuaConst.MissileHitMoveDirType.FarMissile then
        tempFPV2:Reset(entity.components.move.LogicPos):Sub(missile.Pos)
        if tempFPV2 == FP.Const.Vector2_Zero then
            tempFPV2:Reset(missile.MoveDir)
        end               
    end    
    if hitMoveDirOffsetAngle ~= FP.Const.Zero then
        tempFPV2 = FP.V2.GetOffsetToAngle(hitMoveDirOffsetAngle, tempFPV2)
    end
    tempFPV2:Normalize()
    hitComponent.HitAddPos:Reset(tempFPV2):Mul(distance):Mul(delta)
    hitComponent.HitPushTimer:Reset()
    hitComponent.HitPushTotalTime:Reset(duration)
    entity.components.anim.LockCurAnimMove = true -- 注意，一定是在buff中的SetState（common） 之后
    private.ExpressHitEnter(entity,hitComponent.HitAddPos)
end

--[[
	HitDragRange
--]]
function HitSystem.OnHitDragRange(entity, attacker, missile, duration, dragParam)
    if not missile then
        return
    end
    entity.components.buff.CurrentBuffHitType = LuaConst.BuffHitType.HitDragRange
    
    local basePos = missile.Pos
    if dragParam.basePosType == LuaConst.BuffHitMoveBasePosType.Attacker then
        basePos = attacker.components.move.LogicPos
    end
    
    FP.V2.GetOffsetToForward(missile.MoveDir,dragParam.TerminalOffset, tempFPV2) -- tempFPV2 == terminalCenter
    local randRadius = LogicRandom.GetRangeValue(entity, 0, dragParam.TerminalRadius ,25)
    local randRadian = LogicRandom.GetRangeValue(entity, FP.Const.Zero, FP.Const.PI2 ,26)
    local targetOffset = FP.newV2(randRadius * FP.Math.Cos(randRadian), randRadius * FP.Math.Sin(randRadian));
    local hitStartPos = entity.components.move.LogicPos
    tempFPV2:Add(basePos):Add(targetOffset) -- hitTargetPos = tempFPV2

    local hitComponent = entity.components.hit    
    --local delta = LuaConst.TimeSpanMs / duration
    hitComponent.HitAddPos:Reset(tempFPV2):Sub(hitStartPos):Div(duration):Mul(LuaConst.TimeSpanMs)
    hitComponent.HitPushTimer:Reset()
    hitComponent.HitPushTotalTime:Reset(duration)
    --动画的缩放
    private.ExpressHitEnter(entity,hitComponent.HitAddPos)
end



--[[
	HitDragDistance
--]]
function HitSystem.OnHitDragDistance(entity, attacker, missile, duration, dragParam)
    if not missile then
        return
    end
    entity.components.buff.CurrentBuffHitType = LuaConst.BuffHitType.HitDragDistance

    local basePos = missile.Pos
    if dragParam.basePosType == LuaConst.BuffHitMoveBasePosType.Attacker then
        basePos = attacker.components.move.LogicPos
    end

    FP.V2.GetOffsetToForward(missile.MoveDir,dragParam.TerminalOffset, tempFPV2) -- terminalCenter = tempFPV2
    local hitStartPos = entity.components.move.LogicPos
    tempFPV2:Add(basePos) -- terminalPos = tempFPV2
    local direction = FP.V2.Normalized(tempFPV2 - hitStartPos)
    local terminalDis = FP.V2.Magnitude(tempFPV2 - hitStartPos)
    
    --local hitTargetPos = tempFPV2
    if terminalDis > dragParam.HorizontalDistance then -- 距离大于要移动的距离，重新设置终点位置
        tempFPV2:Reset(direction):Mul(dragParam.HorizontalDistance):Add(hitStartPos)
    else 
        --如果 拖拽目标点比移动的距离近，则需速度要保持不变，v = s/t ，s变小所以t等比变小
        duration = FP.Math.Floor( FP.Math.Min(terminalDis / dragParam.HorizontalDistance, FP.Const.One) * duration)
    end

    local hitComponent = entity.components.hit
    hitComponent.HitAddPos:Reset(tempFPV2):Sub(hitStartPos):Div(duration):Mul(LuaConst.TimeSpanMs)
    hitComponent.HitPushTimer:Reset()
    hitComponent.HitPushTotalTime:Reset(duration)
    --动画的缩放
    private.ExpressHitEnter(entity,hitComponent.HitAddPos)
end


--[[
	以特定的速度移动到特定的点。
--]]
function HitSystem.HitMoveToPosBySpd(entity, targetPos, moveSpd)
    entity.components.buff.CurrentBuffHitType = LuaConst.BuffHitType.HitDragDistance
    local hitStartPos = entity:GetLogicPos()

    local hitComponent = entity.components.hit
    hitComponent.HitAddPos:Reset(targetPos):Sub(hitStartPos):Normalize()
    hitComponent.HitAddPos:Mul(moveSpd):Mul(LuaConst.TimeSpan)
    hitComponent.HitPushTimer:Reset()
    hitComponent.HitPushTotalTime:Reset(FP.V2.Distance(hitStartPos, targetPos):Div(moveSpd)):Mul(1000)
end

--[[
	以特定的时间到达特定的点。time:毫秒
--]]
function HitSystem.HitMoveToPosOnTime(entity, targetPos, time)
    entity.components.buff.CurrentBuffHitType = LuaConst.BuffHitType.HitDragDistance
    local hitStartPos = entity:GetLogicPos()
    local hitComponent = entity.components.hit
    hitComponent.HitPushTimer:Reset()
    hitComponent.HitPushTotalTime:Reset(time)
    hitComponent.HitAddPos:Reset(targetPos):Sub(hitStartPos):Div(time):Mul(LuaConst.TimeSpanMs) -- 每帧移动的距离
end

--[[
	Tick
--]]
function HitSystem.OnLogicUpdate(entity)
    local hitComponent = entity.components.hit
    local buffComp = entity.components.buff
    if buffComp.CurrentBuffHitType == LuaConst.BuffHitType.None then
        return
    end

    tempTime:Reset(entity.components.timeScale:GetCurTimeScale()):Mul(LuaConst.TimeSpanMs)
    hitComponent.HitPushTimer:Add(tempTime)

    if hitComponent.HitPushTimer > hitComponent.HitPushTotalTime then
        buffComp.CurrentBuffHitType = LuaConst.BuffHitType.None
    end
    
end


function private.ExpressHitEnter(entity,hitAddPos)
    SystemManager.OnHitEnter(entity,hitAddPos)
end



--添加击飞buff的时候，时间缩放
-- local FlyAwayMinHeight = -0.3
-- local FlyAwayMaxHeight = 0.3
function HitSystem.OnHitFly(entity)
    --暂时不需要了
    -- local moveComp = entity.components.move
    -- moveComp.FlyUpTimer = 0
    -- moveComp.FlyUpRate = LogicRandom.GetRangeValue(entity, FlyAwayMinHeight, FlyAwayMaxHeight,27)
    -- local ts = FP.Const.One + moveComp.FlyUpRate / 2
    -- SystemManager.OnAddTimeScale(entity, "hitFly", ts , -1, LuaConst.TimeScaleBreakType.HitFly )
    
   -- print("加时间缩放：" , ts[1] , "|eid:" ,entity._logicInitData.EntityID ,"----|", LogicUpdateManager._clientHandleFrame)
end


return HitSystem