影鼓：鼓点不停加成不停，挨刀就断

 fx-shadowdrum

-- @file ShadowDrum.lua
-- 影鼓 —— 鼓点不停加成不停，挨刀就断

local ShadowDrum = {}

local CONST = {
    DRUM_LIFE     = 15.0,
    DRUM_CD       = 5.0,
    DRUM_GAP      = 3.0,
    DRUM_CAP      = 8,
    DMG_PER_DRUM  = 2,

    COLOR_DRUM    = "#c89040",
    COLOR_DEEP    = "#503810",
    COLOR_GHOST   = "#f4d8a0",

    ZORDER_DRUM   = 133,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1077000,
}

local _drumT     = 0
local _drumN     = 0
local _drumGap   = 0
local _cdLeft    = 0
local _drumFx    = nil
local _scheduler = nil
local _autoInc   = 0

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

local function BreakDrum()
    _drumT = 0
    _drumN = 0
    SafeRemove(_drumFx)
    _drumFx = nil
    ShowTip("挨打震断了鼓声——鼓点全清，从头再擂")
end

function ShadowDrum.Drum()
    if _cdLeft > 0 or _drumT > 0 then return end
    _cdLeft = CONST.DRUM_CD
    _drumT = CONST.DRUM_LIFE
    _drumN = 0
    _drumGap = 0
    SafeRemove(_drumFx)
    _drumFx = GUI:Layout_Create(GUI:Attach_SceneF(),
        GenID("Drum"), 0, 0, 0, 0, false)
    GUI:setLocalZOrder(_drumFx, CONST.ZORDER_DRUM)
    SL:PlayDrumStartFx(SL:GetValue("USER_ID"))
    SL:TipAboveMe("擂鼓！")
    ShowTip("鼓擂响了——十五秒里每三秒涨一成")
end

-- 定时器：鼓点涨层与鼓环跟脚
if not _scheduler then
    _scheduler = SL:Schedule(function(dt)
        _cdLeft = math.max(0, _cdLeft - dt)
        if _drumT > 0 then
            _drumT = _drumT - dt
            _drumGap = _drumGap + dt
            if _drumGap >= CONST.DRUM_GAP and _drumN < CONST.DRUM_CAP then
                _drumGap = 0
                _drumN = _drumN + 1
                SL:PlayDrumBeatFx(SL:GetValue("USER_ID"), _drumN)
                if _drumN >= CONST.DRUM_CAP then
                    ShowTip("鼓点封顶——八层满鼓，别挨刀")
                end
            end
            local myID = SL:GetValue("USER_ID")
            local mp = GetActorPos(myID)
            if _drumFx and mp then
                GUI:setPosition(_drumFx, mp.x, mp.y - 40)
            end
            if _drumT <= 0 then
                _drumN = 0
                SafeRemove(_drumFx)
                ShowTip("鼓声散了——十五秒极限过了")
            end
        end
    end, 0.02)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("擂鼓", function()
        ShadowDrum.Drum()
    end)
    ShowTip("技能已加载: 影鼓 (调试按钮触发)")
end, 1.0)

function ShadowDrum.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    SL:UnregisterLUAEvent(LUA_EVENT_BEFORE_HURT, "SDM_Break")
    SafeRemove(_drumFx)
    _drumT = 0
    _drumN = 0
end

return ShadowDrum