反噬血纹：刀重六成，血在一滴滴还

 fx-backlast

-- @file Backlash.lua
-- 反噬纹 —— 刀重六成，血在一滴滴还

local Backlash = {}

local CONST = {
    BURN_LIFE     = 8.0,
    BURN_CD       = 6.0,
    AMP_HIT       = 16,
    BASE_HIT      = 10,
    DRAIN_PER_S   = 3,
    HP_FLOOR      = 5,

    COLOR_BURN    = "#a84858",
    COLOR_DEEP    = "#481820",
    COLOR_GHOST   = "#f0b8c0",

    ZORDER_BURN   = 133,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1084000,
}

local _burnT     = 0
local _burnGap   = 0
local _cdLeft    = 0
local _burnFx    = nil
local _scheduler = nil
local _autoInc   = 0

local function GenID(prefix)
    _autoInc = _autoInc + 1
    return string.format("%s_%d", prefix or "BKL",
        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 Backlash.Burning()
    return _burnT > 0
end

-- 重刀结算：燃纹期的刀过增益乘区
SL:RegisterLUAEvent(LUA_EVENT_MELEE_HIT, "BKL_Amp", function(tid)
    if not Backlash.Burning() then return 0 end
    return CONST.AMP_HIT - CONST.BASE_HIT
end)

-- 反噬心跳：一秒一滴，烧到保底自动熄纹
local function DrainPulse()
    local myID = SL:GetValue("USER_ID")
    local hp = SL:GetValue("ACTOR_HP", myID) or 0
    if hp <= CONST.HP_FLOOR + 1 then
        Backlash.Extinguish()
        ShowTip("血见底——纹自己灭了")
        return
    end
    local nextHp = math.max(CONST.HP_FLOOR, hp - CONST.DRAIN_PER_S)
    SL:SetValue("ACTOR_HP", myID, nextHp)
    SL:TipAboveMe("-" .. CONST.DRAIN_PER_S .. " 反噬")
end

function Backlash.Extinguish()
    _burnT = 0
    SafeRemove(_burnFx)
    _burnFx = nil
end

function Backlash.Cast()
    if _cdLeft > 0 or _burnT > 0 then return end
    local myID = SL:GetValue("USER_ID")
    _cdLeft = CONST.BURN_CD
    _burnT = CONST.BURN_LIFE
    _burnGap = 0
    SafeRemove(_burnFx)
    _burnFx = GUI:Layout_Create(GUI:Attach_SceneF(),
        GenID("Burn"), 0, 0, 0, 0, false)
    GUI:setLocalZOrder(_burnFx, CONST.ZORDER_BURN)
    SL:PlayBurnUpFx(myID)
    SL:TipAboveMe("反噬纹！")
    ShowTip("纹烧起来了——刀重十六，血一秒还三点")
end

-- 定时器：燃纹倒计时与心跳驱动
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
        if _burnT > 0 then
            _burnT = _burnT - dt
            _burnGap = _burnGap + dt
            if _burnGap >= 1.0 then
                _burnGap = 0
                DrainPulse()
            end
            local myID = SL:GetValue("USER_ID")
            local mp = GetActorPos(myID)
            if _burnFx and mp then
                GUI:setPosition(_burnFx, mp.x, mp.y - 62)
            end
            if _burnT <= 0 then
                Backlash.Extinguish()
                ShowTip("纹火燃尽了——刀回十点")
            end
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("燃纹", function()
        Backlash.Cast()
    end)
    ShowTip("技能已加载: 反噬纹 (调试按钮触发)")
end, 1.0)

function Backlash.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    SL:UnregisterLUAEvent(LUA_EVENT_MELEE_HIT, "BKL_Amp")
    Backlash.Extinguish()
end

return Backlash