pfUI:RegisterModule("swingtimer", "vanilla:tbc", function ()
  local rawborder, border = GetBorderSize()

  -- Enable Nampower auto attack events
  if GetCVar and SetCVar then
    local success, value = pcall(GetCVar, "NP_EnableAutoAttackEvents")
    if success and value == "0" then
      pcall(SetCVar, "NP_EnableAutoAttackEvents", "1")
    end
  end

  -- HitInfo flags (from Nampower EVENTS.md)
  local HITINFO_LEFTSWING = 4  -- 0x4: Off-hand attack

  -- Swing state
  local swingState = {
    mainhand = { speed = 0, nextSwing = 0, swinging = false },
    offhand  = { speed = 0, nextSwing = 0, swinging = false }
  }

  -- Create container frame
  pfUI.swingtimer = CreateFrame("Frame", "pfSwingTimer", UIParent)
  pfUI.swingtimer:SetFrameStrata("MEDIUM")
  pfUI.swingtimer:Hide()

  local sw_width  = tonumber(C.unitframes.swingtimerwidth)  or 200
  local sw_height = tonumber(C.unitframes.swingtimerheight) or 12

  -- Mainhand bar
  pfUI.swingtimer.mainhand = CreateFrame("StatusBar", "pfSwingTimerMainhand", UIParent)
  pfUI.swingtimer.mainhand:SetPoint("CENTER", UIParent, "CENTER", 0, -100)
  pfUI.swingtimer.mainhand:SetWidth(sw_width)
  pfUI.swingtimer.mainhand:SetHeight(sw_height)
  pfUI.swingtimer.mainhand:SetMinMaxValues(0, 1)
  pfUI.swingtimer.mainhand:SetValue(0)
  pfUI.swingtimer.mainhand:SetStatusBarTexture(pfUI.media["img:bar"])
  pfUI.swingtimer.mainhand:SetStatusBarColor(0.8, 0.3, 0.3, 1)
  pfUI.swingtimer.mainhand:Hide()

  pfUI.swingtimer.mainhand.text = pfUI.swingtimer.mainhand:CreateFontString("Status", "DIALOG", "GameFontNormal")
  pfUI.swingtimer.mainhand.text:SetPoint("CENTER", pfUI.swingtimer.mainhand, "CENTER", 0, 0)
  pfUI.swingtimer.mainhand.text:SetFont(pfUI.font_default, C.global.font_size, "OUTLINE")
  pfUI.swingtimer.mainhand.text:SetTextColor(1, 1, 1, 1)
  pfUI.swingtimer.mainhand.text:SetText("")

  pfUI.swingtimer.mainhand.label = pfUI.swingtimer.mainhand:CreateFontString("Status", "DIALOG", "GameFontNormal")
  pfUI.swingtimer.mainhand.label:SetPoint("RIGHT", pfUI.swingtimer.mainhand, "LEFT", -4, 0)
  pfUI.swingtimer.mainhand.label:SetFont(pfUI.font_default, C.global.font_size, "OUTLINE")
  pfUI.swingtimer.mainhand.label:SetTextColor(0.8, 0.8, 0.8, 1)
  pfUI.swingtimer.mainhand.label:SetText("MH")

  CreateBackdrop(pfUI.swingtimer.mainhand)
  CreateBackdropShadow(pfUI.swingtimer.mainhand)

  -- Offhand bar
  pfUI.swingtimer.offhand = CreateFrame("StatusBar", "pfSwingTimerOffhand", UIParent)
  pfUI.swingtimer.offhand:SetPoint("TOP", pfUI.swingtimer.mainhand, "BOTTOM", 0, -4)
  pfUI.swingtimer.offhand:SetWidth(sw_width)
  pfUI.swingtimer.offhand:SetHeight(sw_height)
  pfUI.swingtimer.offhand:SetMinMaxValues(0, 1)
  pfUI.swingtimer.offhand:SetValue(0)
  pfUI.swingtimer.offhand:SetStatusBarTexture(pfUI.media["img:bar"])
  pfUI.swingtimer.offhand:SetStatusBarColor(0.3, 0.8, 0.3, 1)
  pfUI.swingtimer.offhand:Hide()

  pfUI.swingtimer.offhand.text = pfUI.swingtimer.offhand:CreateFontString("Status", "DIALOG", "GameFontNormal")
  pfUI.swingtimer.offhand.text:SetPoint("CENTER", pfUI.swingtimer.offhand, "CENTER", 0, 0)
  pfUI.swingtimer.offhand.text:SetFont(pfUI.font_default, C.global.font_size, "OUTLINE")
  pfUI.swingtimer.offhand.text:SetTextColor(1, 1, 1, 1)
  pfUI.swingtimer.offhand.text:SetText("")

  pfUI.swingtimer.offhand.label = pfUI.swingtimer.offhand:CreateFontString("Status", "DIALOG", "GameFontNormal")
  pfUI.swingtimer.offhand.label:SetPoint("RIGHT", pfUI.swingtimer.offhand, "LEFT", -4, 0)
  pfUI.swingtimer.offhand.label:SetFont(pfUI.font_default, C.global.font_size, "OUTLINE")
  pfUI.swingtimer.offhand.label:SetTextColor(0.8, 0.8, 0.8, 1)
  pfUI.swingtimer.offhand.label:SetText("OH")

  CreateBackdrop(pfUI.swingtimer.offhand)
  CreateBackdropShadow(pfUI.swingtimer.offhand)

  UpdateMovable(pfUI.swingtimer.mainhand)

  -- inventoryType numbers from ItemStats DBC:
  --   17 = INVTYPE_WEAPON (one-hand, can go in either hand)
  --   21 = INVTYPE_WEAPONOFFHAND
  local OH_SWINGABLE = { [17] = true, [21] = true }

  local function HasOffhandWeapon()
    if GetEquippedItem then
      local item = GetEquippedItem("player", 17)
      if not item or not item.itemId or item.itemId == 0 then return false end
      local invType = GetItemStatsField and GetItemStatsField(item.itemId, "inventoryType")
      if invType then
        return OH_SWINGABLE[invType] == true
      end
    end
    -- Fallback: vanilla API
    local link = GetInventoryItemLink("player", 17)
    if not link then return false end
    local _, _, _, _, _, _, _, _, invTypeStr = GetItemInfo(link)
    return invTypeStr == "INVTYPE_WEAPON" or invTypeStr == "INVTYPE_WEAPONOFFHAND"
  end

  local function UpdateWeaponSpeeds()
    if not GetUnitField then return end

    local mhSpeed = GetUnitField("player", "baseAttackTime")
    if mhSpeed and mhSpeed > 0 then
      swingState.mainhand.speed = mhSpeed / 1000
    end

    if HasOffhandWeapon() then
      local ohSpeed = GetUnitField("player", "offhandAttackTime")
      if ohSpeed and ohSpeed > 0 then
        swingState.offhand.speed = ohSpeed / 1000
      else
        swingState.offhand.speed = 0
      end
    else
      swingState.offhand.speed = 0
    end
  end

  local function StartSwing(isOffhand)
    local now = GetTime()

    UpdateWeaponSpeeds()

    if isOffhand and swingState.offhand.speed > 0 then
      swingState.offhand.nextSwing = now + swingState.offhand.speed
      swingState.offhand.swinging  = true
      pfUI.swingtimer.offhand:Show()
    else
      swingState.mainhand.nextSwing = now + swingState.mainhand.speed
      swingState.mainhand.swinging  = true
      pfUI.swingtimer.mainhand:Show()
    end

    pfUI.swingtimer:Show()
  end

  pfUI.swingtimer:SetScript("OnUpdate", function()
    local now = GetTime()
    local anyActive = false

    if swingState.mainhand.swinging then
      local remaining = swingState.mainhand.nextSwing - now
      if remaining <= 0 then
        swingState.mainhand.swinging = false
        pfUI.swingtimer.mainhand:Hide()
      else
        local progress = 1 - (remaining / swingState.mainhand.speed)
        pfUI.swingtimer.mainhand:SetValue(progress)
        pfUI.swingtimer.mainhand.text:SetText(string.format("%.1f", remaining))
        anyActive = true
      end
    end

    if swingState.offhand.swinging then
      local remaining = swingState.offhand.nextSwing - now
      if remaining <= 0 then
        swingState.offhand.swinging = false
        pfUI.swingtimer.offhand:Hide()
      else
        local progress = 1 - (remaining / swingState.offhand.speed)
        pfUI.swingtimer.offhand:SetValue(progress)
        pfUI.swingtimer.offhand.text:SetText(string.format("%.1f", remaining))
        anyActive = true
      end
    end

    if not anyActive then
      this:Hide()
    end
  end)

  local events = CreateFrame("Frame")
  events:RegisterEvent("AUTO_ATTACK_SELF")
  events:RegisterEvent("PLAYER_ENTERING_WORLD")
  events:RegisterEvent("UNIT_INVENTORY_CHANGED")
  events:RegisterEvent("PLAYER_REGEN_DISABLED")
  events:RegisterEvent("PLAYER_REGEN_ENABLED")
  events:RegisterEvent("PLAYER_TARGET_CHANGED")

  local function ResetSwingTimers()
    swingState.mainhand.swinging = false
    swingState.offhand.swinging  = false
    pfUI.swingtimer.mainhand:Hide()
    pfUI.swingtimer.offhand:Hide()
    pfUI.swingtimer:Hide()
  end

  events:SetScript("OnEvent", function()
    if event == "AUTO_ATTACK_SELF" then
      local hitInfo = arg4 or 0
      if bit.band(hitInfo, 65536) ~= 0 then return end
      local isOffhand = bit.band(hitInfo, HITINFO_LEFTSWING) ~= 0
      StartSwing(isOffhand)

    elseif event == "PLAYER_ENTERING_WORLD" then
      UpdateWeaponSpeeds()

    elseif event == "UNIT_INVENTORY_CHANGED" then
      if arg1 and arg1 ~= "player" then return end
      UpdateWeaponSpeeds()
      if swingState.offhand.speed == 0 then
        swingState.offhand.swinging = false
        pfUI.swingtimer.offhand:Hide()
      end

    elseif event == "PLAYER_REGEN_DISABLED" then
      UpdateWeaponSpeeds()

    elseif event == "PLAYER_REGEN_ENABLED" then
      ResetSwingTimers()

    elseif event == "PLAYER_TARGET_CHANGED" then
      if not UnitExists("target") or UnitIsDead("target") then
        ResetSwingTimers()
      end
    end
  end)

  UpdateWeaponSpeeds()
end)