风向：风一转向，箭程跟着变

 fx-windgust

-- @file WindGust.lua
-- 风向 —— 风一转向，箭程跟着变

local WindGust = {}

local CONST = {
    TAILWIND_ADD  = 5,
    HEADWIND_CUT  = 5,
    FLAG_CD       = 4.0,

    COLOR_WIND    = "#78a8c8",
    COLOR_DEEP    = "#284858",
    COLOR_GHOST   = "#c8e0f0",

    ZORDER_FLAG   = 134,
    ZORDER_FX     = 135,
    AUTOINC_BASE  = 1048000,
}

local _wind      = 1
local _cdLeft    = 0
local _flagFx    = nil
local _scheduler = nil
local _autoInc   = 0

local function GenID(prefix)
    _autoInc = _autoInc + 1
    return string.format("%s_%d", prefix or "WGS",
        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 WindGust.Turn()
    if _cdLeft > 0 then
        ShowTip("旗在转——" .. string.format("%.1f", _cdLeft) .. "秒")
        return
    end
    _cdLeft = CONST.FLAG_CD
    _wind = -_wind
    SL:PlayFlagTurnFx(_wind)
    SL:TipAboveMe(_wind == 1 and "风转向它" or "风转向我")
    if _wind == 1 then
        ShowTip("风转向它——你的箭顺风加五，它的箭也顺风加五")
    else
        ShowTip("风转向你——两边箭都逆风减五")
    end
end

-- 风向结算：顺风加重逆风减轻
SL:RegisterLUAEvent(LUA_EVENT_SHOT_FIRED, "WGS_Amp", function(tid, dmg)
    local shooterSide = SL:GetValue("ACTOR_SIDE", tid)
    local shooterIsFoe = shooterSide == "foe"
    local shootingDownwind = (shooterIsFoe and _wind == -1)
        or ((not shooterIsFoe) and _wind == 1)
    if shootingDownwind then
        return dmg + CONST.TAILWIND_ADD
    end
    return math.max(1, dmg - CONST.HEADWIND_CUT)
end)

-- 定时器：风纹演出
if not _scheduler then
    _scheduler = SL:Schedule(function()
        if pt60() % 4 == 0 then
            SL:PlayWindStreakFx(_wind)
        end
    end, 0.02)
end

function pt60()
    return math.floor(SL:GetTime() * 60)
end

SL:ScheduleOnce(function()
    SL:BindDebugButton("转风", function()
        WindGust.Turn()
    end)
    ShowTip("技能已加载: 风向 (调试按钮触发)")
end, 1.0)

function WindGust.Unload()
    if _scheduler then SL:Unschedule(_scheduler) end
    SL:UnregisterLUAEvent(LUA_EVENT_SHOT_FIRED, "WGS_Amp")
end

return WindGust