local RIGHT_CHAIN = { 23, 24, 24, 8, 7, 6, 5, 4, 3, 2, 1, 0, 9 }
local LEFT_CHAIN  = { 22, 21, 20, 18, 17, 16, 15, 14, 13, 12, 11, 10, 19 }

local MAX_STEPS = #RIGHT_CHAIN 

local function init()
end

local function fillCenterOutCustom(ledValue)
  -- ledValue 范围 0 到 255
  -- 计算当前油门应该扩散到第几层灯珠 (0 到 13)
  local spreadProgress = (ledValue / 255) * MAX_STEPS
  local activeSteps = math.floor(spreadProgress)
  
  local remainder = spreadProgress - activeSteps
  local edgeBrightness = math.floor(5 + (remainder * 250))
  
  if ledValue == 255 then
    activeSteps = MAX_STEPS
    edgeBrightness = 255
  end
  
  for step = 1, MAX_STEPS do
    local rLed = RIGHT_CHAIN[step]
    local lLed = LEFT_CHAIN[step]
    
    if step <= activeSteps then
      if rLed then setRGBLedColor(rLed, 255, 0, 0) end
      if lLed then setRGBLedColor(lLed, 255, 0, 0) end
    elseif step == activeSteps + 1 then
      if rLed then setRGBLedColor(rLed, edgeBrightness, 0, 0) end
      if lLed then setRGBLedColor(lLed, edgeBrightness, 0, 0) end
    else
      if rLed then setRGBLedColor(rLed, 0, 0, 0) end
      if lLed then setRGBLedColor(lLed, 0, 0, 0) end
    end
  end
end

local function run()
  local throttle = getOutputValue(2)
  
  local ledValue = math.floor((throttle + 1024) * 255 / 2048)
  ledValue = math.max(0, math.min(255, ledValue))
  
  fillCenterOutCustom(ledValue)
  
  applyRGBLedColors()
end

local function background()
end

return { run=run, background=background, init=init }