pfUI:RegisterModule("cooldown", "vanilla:tbc", function ()
  -- cache values
  local lowcolor    = {strsplit(",", C.appearance.cd.lowcolor)}
  local normalcolor = {strsplit(",", C.appearance.cd.normalcolor)}
  local minutecolor = {strsplit(",", C.appearance.cd.minutecolor)}
  local hourcolor   = {strsplit(",", C.appearance.cd.hourcolor)}
  local daycolor    = {strsplit(",", C.appearance.cd.daycolor)}

  local parent
  local function pfCooldownOnUpdate()
    parent = this:GetParent()
    if not parent then this:Hide() end

    -- avoid to set cooldowns on invalid frames
    if parent and parent:GetName() and _G[parent:GetName() .. "Cooldown"] then
      if not _G[parent:GetName() .. "Cooldown"]:IsShown() then
        this:Hide()
      end
    end

    if not this.next then this.next = GetTime() + .1 end
    if this.next > GetTime() then return end
    this.next = GetTime() + .1

    -- fix own alpha value (should be inherited, but somehow isn't always)
    this:SetAlpha(parent:GetAlpha())

    local remaining = this.duration - (GetTime() - this.start)
    if remaining >= 0 then
      this.text:SetText(GetColoredTimeString(remaining))
    else
      this:Hide()
    end
  end

  local function pfCreateCoolDown(cooldown, start, duration)
    cooldown.pfCooldownText = CreateFrame("Frame", "pfCooldownFrame", cooldown:GetParent())
    cooldown.pfCooldownText:SetAllPoints(cooldown)
    cooldown.pfCooldownText:SetFrameLevel(cooldown:GetParent():GetFrameLevel() + 1)

    cooldown.pfCooldownText.text = cooldown.pfCooldownText:CreateFontString("pfCooldownFrameText", "OVERLAY")
    if not cooldown.pfCooldownType then
      cooldown.pfCooldownText.text:SetFont(pfUI.font_unit, C.appearance.cd.font_size_foreign, "OUTLINE")
    elseif cooldown.pfCooldownType == "BLIZZARD" then
      cooldown.pfCooldownText.text:SetFont(pfUI.font_unit, C.appearance.cd.font_size_blizz, "OUTLINE")
    elseif cooldown.pfCooldownSize then
      cooldown.pfCooldownText.text:SetFont(pfUI.font_unit, cooldown.pfCooldownSize, "OUTLINE")
    else
      cooldown.pfCooldownText.text:SetFont(pfUI.font_unit, C.appearance.cd.font_size, "OUTLINE")
    end

    cooldown.pfCooldownText.text:SetPoint("CENTER", cooldown.pfCooldownText, "CENTER", 0, 0)
    cooldown.pfCooldownText:SetScript("OnUpdate", pfCooldownOnUpdate)
  end

  -- hook
  local function SetCooldown(this, start, duration, enable)
    -- abort on unknown frames
    if C.appearance.cd.foreign == "0" and not this.pfCooldownType then
      return
    end

    -- add support for omnicc's disable flag
    if this.noCooldownCount then
      return
    end

    -- realign cooldown frames
    local parent = this.GetParent and this:GetParent()
    if parent and parent:GetWidth() / 36 > 0 then
      this:SetScale(parent:GetWidth() / 36)
      this:SetPoint("TOPLEFT", parent, "TOPLEFT", -1, 1)
      this:SetPoint("BOTTOMRIGHT", parent, "BOTTOMRIGHT", 1, -1)
    end

    -- don't draw global cooldowns
    if this.pfCooldownType == "NOGCD" and duration < tonumber(C.appearance.cd.threshold) then
      return
    end

    -- hide animation
    if this.pfCooldownStyleAnimation == 0 then
      this:SetAlpha(0)
    else
      this:SetAlpha(this:GetParent():GetAlpha())
    end

    -- print time as text on cooldown frames
    if ( not this.pfCooldownStyleText or this.pfCooldownStyleText == 1)
    and start > 0 and duration > 0 and (not enable or enable > 0) then
      if( not this.pfCooldownText ) then
        pfCreateCoolDown(this, start, duration)
      end

      this.pfCooldownText.start = start
      this.pfCooldownText.duration = duration
      this.pfCooldownText:Show()
    elseif(this.pfCooldownText) then
      this.pfCooldownText:Hide()
    end
  end

  if pfUI.expansion == "vanilla" then
    -- vanilla does not have a cooldown frame type, so we hook the
    -- regular SetTimer function that each one is calling.
    hooksecurefunc("CooldownFrame_SetTimer", SetCooldown)
  else
    -- tbc and later expansion have a cooldown frametype, so we can
    -- hook directly into the frame creation and add our function there.
    local methods = getmetatable(CreateFrame('Cooldown', nil, nil, 'CooldownFrameTemplate')).__index
    hooksecurefunc(methods, 'SetCooldown', SetCooldown)
  end
end)