让先礼纹：让它一招，下一刀翻倍

 fx-yieldfirst

-- @file YieldFirst.lua
-- 让先纹 —— 让它一招，下一刀翻倍

local YieldFirst = {}

local CONST = {
    CREST_LIFE    = 12.0,
    CREST_CD      = 5.0,
    DOUBLE_DMG    = 28,
    BASE_DMG      = 12,

    COLOR_YIELD   = "#7090a8",
    COLOR_DEEP    = "#243848",
    COLOR_GHOST   = "#c0d8e8",

    ZORDER_YIELD  = 133,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1100000,
}

local _crestT    = 0
local _cdLeft    = 0
local _yielded   = false
local _doubled   = false
local _crestFx   = nil
local _scheduler = nil
local _autoInc   = 0

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

function YieldFirst.Doubled()
    return _doubled
end

-- 空招判定：挂在受击通道最上游，先于任何扣血
SL:RegisterLUAEvent(LUA_EVENT_BEFORE_HURT, "YDF_Yield", function(srcID, dmg)
    if _crestT <= 0 or _yielded then return dmg end
    if srcID ~= SL:GetValue("MARK_TARGET_ID") then return dmg end
    _yielded = true
    _doubled = true
    SL:PlayYieldFx(SL:GetValue("USER_ID"))
    SL:TipAboveMe("让!")
    ShowTip("让过了它的头一招——下一刀翻倍")
    return 0
end)

-- 加倍落刀：让出来的利息，落一刀即清
function YieldFirst.SwingDamage()
    if not _doubled then return CONST.BASE_DMG end
    _doubled = false
    SL:TipAboveMe("倍!")
    return CONST.DOUBLE_DMG
end

function YieldFirst.Cast()
    if _cdLeft > 0 or _crestT > 0 then return end
    local myID = SL:GetValue("USER_ID")
    _cdLeft = CONST.CREST_CD
    _crestT = CONST.CREST_LIFE
    _yielded = false
    _doubled = false
    SafeRemove(_crestFx)
    _crestFx = GUI:Layout_Create(GUI:Attach_SceneF(),
        GenID("Crest"), 0, 0, 0, 0, false)
    GUI:setLocalZOrder(_crestFx, CONST.ZORDER_YIELD)
    SL:PlayYieldUpFx(myID)
    ShowTip("让先纹开了——让过它的头一招，你的下一刀翻倍")
end

-- 定时器：窗口倒计时与纹环跟画
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
        if _crestT > 0 then
            _crestT = _crestT - dt
            local myID = SL:GetValue("USER_ID")
            local mp = GetActorPos(myID)
            if _crestFx and mp then
                GUI:setPosition(_crestFx, mp.x, mp.y - 62)
            end
            if _crestT <= 0 then
                SafeRemove(_crestFx)
                if not _yielded then
                    ShowTip("纹收了——它也没出手，白让了")
                else
                    ShowTip("纹收了")
                end
            end
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("让先", function()
        YieldFirst.Cast()
    end)
    ShowTip("技能已加载: 让先纹 (调试按钮触发)")
end, 1.0)

function YieldFirst.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    SL:UnregisterLUAEvent(LUA_EVENT_BEFORE_HURT, "YDF_Yield")
    SafeRemove(_crestFx)
    _crestT = 0
    _yielded = false
    _doubled = false
end

return YieldFirst