照形镜纹：踩进镜子里的它，现形挨重刀

 fx-shadowcast

-- @file ShadowCast.lua
-- 照形镜纹 —— 踩进镜子里的它，现形挨重刀

local ShadowCast = {}

local CONST = {
    POOL_LIFE     = 6.0,
    POOL_CD       = 2.0,
    POOL_RADIUS   = 40,
    AMP_HIT       = 16,
    BASE_HIT      = 12,

    COLOR_POOL    = "#70a8a0",
    COLOR_DEEP    = "#244840",
    COLOR_GHOST   = "#b8e8e0",

    ZORDER_POOL   = 89,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1116000,
}

local _poolT     = 0
local _cdLeft    = 0
local _poolX     = 0
local _poolFx    = nil
local _scheduler = nil
local _autoInc   = 0

local function GenID(prefix)
    _autoInc = _autoInc + 1
    return string.format("%s_%d", prefix or "SHC",
        CONST.AUTOINC_BASE + _autoInc)
end

local function GetActorPos(id)
    if not id then return nil end
    local x = SL:GetValue("ACTOR_POSITION_X", id)
    local y = SL:GetValue("ACTOR_POSITION_Y", id)
    if not x or not y then return nil end
    return { x = x, y = y }
end

local function SafeRemove(node)
    if node and not GUI:Widget_IsNull(node) then
        GUI:removeFromParent(node)
    end
end

local function ShowTip(msg)
    if msg and msg ~= "" then SL:ShowSystemTips(msg) end
end

-- 现形判定：它的脚在镜心四十步之内
function ShadowCast.Exposed()
    if _poolT <= 0 then return false end
    local tp = GetActorPos(SL:GetValue("MARK_TARGET_ID"))
    if not tp then return false end
    return math.abs(tp.x - _poolX) <= CONST.POOL_RADIUS
end

-- 加重通道：现形的怪挨的刀走重档
SL:RegisterLUAEvent(LUA_EVENT_MELEE_DAMAGE, "SHC_Amp", function()
    if ShadowCast.Exposed() then
        return CONST.AMP_HIT - CONST.BASE_HIT
    end
    return 0
end)

function ShadowCast.Cast()
    if _cdLeft > 0 then return end
    local tid = SL:GetValue("MARK_TARGET_ID")
    local tp = tid and GetActorPos(tid)
    if not tp then return end
    _cdLeft = CONST.POOL_CD
    _poolT = CONST.POOL_LIFE
    _poolX = tp.x
    SafeRemove(_poolFx)
    _poolFx = GUI:Layout_Create(GUI:Attach_Scene(),
        GenID("Pool"), _poolX, tp.y, 0, 0, false)
    GUI:setLocalZOrder(_poolFx, CONST.ZORDER_POOL)
    SL:PlayPoolUpFx(_poolX)
    ShowTip("镜子铺在它脚下了——它踩着现形，刀就重")
end

-- 定时器：镜期倒计时与镜光流转
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
        if _poolT > 0 then
            _poolT = _poolT - dt
            if _poolT <= 0 then
                SafeRemove(_poolFx)
                ShowTip("镜散了——地上只剩水汽")
            end
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("照形", function()
        ShadowCast.Cast()
    end)
    ShowTip("技能已加载: 照形纹 (调试按钮触发)")
end, 1.0)

function ShadowCast.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    SL:UnregisterLUAEvent(LUA_EVENT_MELEE_DAMAGE, "SHC_Amp")
    SafeRemove(_poolFx)
    _poolT = 0
end

return ShadowCast