分压卸纹：围上来的越多，落下的刀越轻

 fx-pressuresplit

-- @file PressureSplit.lua
-- 分压纹 —— 围上来的越多，落下的刀越轻

local PressureSplit = {}

local CONST = {
    CREST_LIFE    = 10.0,
    CREST_CD      = 4.0,
    SPLIT_TWO     = 0.7,
    SPLIT_THREE   = 0.5,
    SPLIT_MORE    = 0.4,

    COLOR_SPLIT   = "#7868a8",
    COLOR_DEEP    = "#2e2048",
    COLOR_GHOST   = "#c8b8e8",

    ZORDER_SPLIT  = 133,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1103000,
}

local _crestT    = 0
local _cdLeft    = 0
local _crestFx   = nil
local _scheduler = nil
local _autoInc   = 0

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

-- 围攻计数：数一数正在打你的手
function PressureSplit.AttackHands()
    local n = 0
    for _, tid in ipairs(SL:EnumAttackers(
        SL:GetValue("USER_ID"))) do
        n = n + 1
    end
    return n
end

-- 分压系数：围得越厚，每双手越薄
function PressureSplit.Coefficient()
    local n = PressureSplit.AttackHands()
    if n <= 1 then return 1 end
    if n == 2 then return CONST.SPLIT_TWO end
    if n == 3 then return CONST.SPLIT_THREE end
    return CONST.SPLIT_MORE
end

-- 分压应用：它们打来的每一刀按系数拆薄
SL:RegisterLUAEvent(LUA_EVENT_BEFORE_HURT, "PRS_Split",
function(srcID, dmg)
    if srcID == SL:GetValue("USER_ID") then return dmg end
    if _crestT <= 0 then return dmg end
    local coe = PressureSplit.Coefficient()
    if coe >= 1 then return dmg end
    local cut = math.floor(dmg * (1 - coe))
    SL:TipAboveMe("-" .. cut .. " 分压")
    return math.max(1, dmg - cut)
end)

function PressureSplit.Cast()
    if _cdLeft > 0 or _crestT > 0 then return end
    local myID = SL:GetValue("USER_ID")
    _cdLeft = CONST.CREST_CD
    _crestT = CONST.CREST_LIFE
    SafeRemove(_crestFx)
    _crestFx = GUI:Layout_Create(GUI:Attach_SceneF(),
        GenID("Split"), 0, 0, 0, 0, false)
    GUI:setLocalZOrder(_crestFx, CONST.ZORDER_SPLIT)
    SL:PlaySplitUpFx(myID)
    ShowTip("分压开了——两只一起打你，每双手轻三成")
end

-- 定时器：纹成倒计时与围攻播报
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)
                ShowTip("纹收了——落下的刀又是一只的分量")
            end
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("分压", function()
        PressureSplit.Cast()
    end)
    ShowTip("技能已加载: 分压纹 (调试按钮触发)")
end, 1.0)

function PressureSplit.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    SL:UnregisterLUAEvent(LUA_EVENT_BEFORE_HURT, "PRS_Split")
    SafeRemove(_crestFx)
    _crestT = 0
end

return PressureSplit