行账脚纹：它走一步疼一步，越走越犹豫

 fx-stepdebit

-- @file StepDebit.lua
-- 行账纹 —— 它走一步疼一步，越走越犹豫

local StepDebit = {}

local CONST = {
    CREST_LIFE    = 12.0,
    CREST_CD      = 4.0,
    STEP_DIST     = 22,
    DEBIT_PER     = 3,

    COLOR_DEBIT   = "#889868",
    COLOR_DEEP    = "#384818",
    COLOR_GHOST   = "#d0e0b0",

    ZORDER_DEBIT  = 133,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1109000,
}

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

local function GenID(prefix)
    _autoInc = _autoInc + 1
    return string.format("%s_%d", prefix or "SPD",
        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 StepDebit.Ticks()
    return _stepAcc
end

-- 步幅累计：位移进账本，攒满一步扣一笔
local function AccrueStep()
    if _crestT <= 0 then return end
    local tid = SL:GetValue("MARK_TARGET_ID")
    if not tid then return end
    local tp = GetActorPos(tid)
    if not tp then return end
    local moved = math.abs(tp.x - _lastX)
    _lastX = tp.x
    _stepAcc = _stepAcc + moved
    while _stepAcc >= CONST.STEP_DIST do
        _stepAcc = _stepAcc - CONST.STEP_DIST
        SL:ActorHurt(tid, CONST.DEBIT_PER)
        SL:TipAbove(tid, "账-" .. CONST.DEBIT_PER)
        SL:PlayStepFx(tid)
    end
end

function StepDebit.Cast()
    if _cdLeft > 0 or _crestT > 0 then return end
    local tid = SL:GetValue("MARK_TARGET_ID")
    if not tid then return end
    local tp = GetActorPos(tid)
    _cdLeft = CONST.CREST_CD
    _crestT = CONST.CREST_LIFE
    _stepAcc = 0
    _lastX = tp and tp.x or 0
    SafeRemove(_crestFx)
    _crestFx = GUI:Layout_Create(GUI:Attach_SceneF(),
        GenID("Ledger"), 0, 0, 0, 0, false)
    GUI:setLocalZOrder(_crestFx, CONST.ZORDER_DEBIT)
    SL:PlayDebitUpFx(tid)
    ShowTip("行账开了——它走一步疼三点，走着瞧")
end

-- 定时器：纹成倒计时与步幅驱动
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
        if _crestT > 0 then
            _crestT = _crestT - dt
            AccrueStep()
            if _crestT <= 0 then
                SafeRemove(_crestFx)
                ShowTip("账收了——它的脚放开了")
            end
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("行账", function()
        StepDebit.Cast()
    end)
    ShowTip("技能已加载: 行账纹 (调试按钮触发)")
end, 1.0)

function StepDebit.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    SafeRemove(_crestFx)
    _crestT = 0
    _stepAcc = 0
end

return StepDebit