pfUI:RegisterModule("thirdparty", function()
  -- This module includes the core logic of thirdparty modules.
  -- Right now, in particular the functions to register addons to the
  -- dockframe of the chat panel aswell as the thirdparty root-table.
  -- For vanilla-specific glue, see: thirdparty-vanilla.

  pfUI.thirdparty = {}

  do -- addon dockframe
    pfUI.thirdparty.meters = CreateFrame("Frame")
    pfUI.thirdparty.meters:SetScript("OnEvent", function()
      if C.thirdparty.showmeter == "1" then
        pfUI.thirdparty.meters.state = nil
      else
        pfUI.thirdparty.meters.state = true
      end

      pfUI.thirdparty.meters:Toggle()
      this:UnregisterAllEvents()
    end)

    pfUI.thirdparty.meters.damage = nil
    pfUI.thirdparty.meters.threat = nil
    pfUI.thirdparty.meters.state = nil

    function pfUI.thirdparty.meters:RegisterMeter(side, data)
      -- abort when one addon is already register on the side
      if pfUI.thirdparty.meters[side] then return end

      -- load addon table
      local config, addon, frame, single, dual, show, hide, once = unpack(data)

      -- put addon into dockmode when enabled
      if C.thirdparty[config] and C.thirdparty[config].dock == "1" then
        pfUI.thirdparty.meters[side] = data

        -- initialize and hide the frame in the beginning
        if once then once() end
        if hide then hide() end

        -- enable toggle event on the panel button
        if pfUI.panel then
          pfUI.panel.right.hide:SetScript("OnClick", function()
            pfUI.thirdparty.meters:Toggle()
          end)
        end

        -- show/hide meter on login by default
        self:RegisterEvent("PLAYER_ENTERING_WORLD")
      end
    end

    function pfUI.thirdparty.meters:Resize()
      if not pfUI.chat or not pfUI.panel then return end

      if self.damage then -- resize damage meter
        local config, addon, frame, single, dual, show, hide = unpack(self.damage)
        if frame and C.thirdparty[config].dock == "1" then
          if not self.threat then single() else dual() end
        end
      end

      if self.threat then -- resize threat meter
        local config, addon, frame, single, dual, show, hide = unpack(self.threat)
        if frame and C.thirdparty[config].dock == "1" then
          if not self.damage then single() else dual() end
        end
      end
    end

    function pfUI.thirdparty.meters:Toggle()
      self:Resize()

      -- show/hide right chatframe
      if pfUI.chat and C.chat.right.enable == "1" then
        -- make sure the panel header stays hidden
        if self.state then
          pfUI.chat.right.panelTop:Show()
        else
          pfUI.chat.right.panelTop:Hide()
        end

        -- set chat visibility
        pfUI.chat.right:SetAlpha(self.state and 1 or 0)
      end

      -- show/hide damage meters
      if self.damage then
        local config, addon, frame, single, dual, show, hide = unpack(self.damage)
        if not self.state then show() else hide() end
      end

      -- show/hide threat meters
      if self.threat then
        local config, addon, frame, single, dual, show, hide = unpack(self.threat)
        if not self.state then show() else hide() end
      end

      -- show meters
      if not self.state then
        self.state = true
      else
        self.state = nil
      end
    end
  end


  do -- bag sort addon
    pfUI.thirdparty.bagsort = nil
    -- Third-party sort addons (SortBags, MrPlow, etc.) override pfUI's built-
    -- in sorter by rebinding the existing pfUI.bag.{right,left}.sort buttons
    -- created in modules/bags.lua. First-come-first-served — if multiple
    -- third-party sorters are installed, the first to register wins.
    function pfUI.thirdparty.RegisterBagSort(name, bag, bagtooltip, bank, banktooltip)
      if pfUI.thirdparty.bagsort then return end
      if not pfUI.bag or not pfUI.bag.right or not pfUI.bag.right.sort then return end

      pfUI.thirdparty.bagsort = name

      -- Rebind bag (right) button
      local rb = pfUI.bag.right.sort
      rb:SetScript("OnClick", bag)
      rb:SetScript("OnEnter", function()
        rb.backdrop:SetBackdropBorderColor(1,1,.25,1)
        rb.texture:SetVertexColor(1,1,.25,1)
        if bagtooltip then bagtooltip() end
      end)

      -- Rebind bank (left) button
      if pfUI.bag.left and pfUI.bag.left.sort then
        local lb = pfUI.bag.left.sort
        lb:SetScript("OnClick", bank)
        lb:SetScript("OnEnter", function()
          lb.backdrop:SetBackdropBorderColor(1,1,.25,1)
          lb.texture:SetVertexColor(1,1,.25,1)
          if banktooltip then banktooltip() end
        end)
      end
    end
  end

  -- MrPlow Bag Sorting Addon.
  -- Vanilla: https://www.wowace.com/projects/mr-plow/files/288059
  -- TBC: https://www.wowace.com/projects/mr-plow/files/136162
  HookAddonOrVariable("MrPlow", function()
    if C.thirdparty.mrplow.enable == "0" then return end

    local sort = CreateFrame("Frame", nil)
    sort:RegisterEvent("PLAYER_ENTERING_WORLD")
    sort:SetScript("OnEvent", function()
      this:UnregisterAllEvents()

      local MrPlowL = AceLibrary and AceLibrary("AceLocale-2.2"):new("MrPlow")
      if not (MrPlowL and MrPlowL["Bank"]) then return end

      pfUI.thirdparty.RegisterBagSort("MrPlow",
        function()
          MrPlow:Works()
        end,
        function()
          GameTooltip:SetOwner(this, "ANCHOR_RIGHT")
          GameTooltip:SetText(MrPlowL["Mr Plow"])
          GameTooltip:AddLine(MrPlowL["The Works"],1,1,1)
          GameTooltip:Show()
        end,
        function()
          MrPlow:Works(MrPlowL["Bank"])
        end,
        function()
          GameTooltip:SetOwner(this, "ANCHOR_RIGHT")
          GameTooltip:SetText(MrPlowL["Mr Plow"])
          GameTooltip:AddLine(MrPlowL["Bank"],1,1,1)
          GameTooltip:Show()
        end)
    end)
  end)

  -- ShaguDPS Damage Meter
  -- Vanilla: https://github.com/shagu/ShaguDPS
  -- TBC: https://github.com/shagu/ShaguDPS
  HookAddonOrVariable("ShaguDPS", function()
    local docktable = { "shagudps", "ShaguDPS", "ShaguDPSWindow",
      function() -- single
        ShaguDPSWindow:ClearAllPoints()
        ShaguDPSWindow:SetAllPoints(pfUI.chat.right)
        ShaguDPSWindow:SetWidth(pfUI.chat.right:GetWidth())
        if ShaguDPSWindow.Resize then ShaguDPSWindow:Resize() end
      end,
      function() -- dual
        ShaguDPSWindow:ClearAllPoints()
        ShaguDPSWindow:SetPoint("TOPLEFT", pfUI.chat.right, "TOP", 0, 0)
        ShaguDPSWindow:SetPoint("BOTTOMRIGHT", pfUI.chat.right, "BOTTOMRIGHT", 0, 0)
        ShaguDPSWindow:SetWidth(pfUI.chat.right:GetWidth() / 2)
        if ShaguDPSWindow.Resize then ShaguDPSWindow:Resize() end
      end,
      function() -- show
        ShaguDPS.config.visible = 1
        ShaguDPS.window.Refresh(true)
      end,
      function() -- hide
        ShaguDPS.config.visible = 0
        ShaguDPS.window.Refresh(true)
      end
    }

    pfUI.thirdparty.meters:RegisterMeter("damage", docktable)

    if C.thirdparty.shagudps.skin == "1" then
      local hookRefresh = ShaguDPS.window.Refresh
      ShaguDPS.window.Refresh = function (arg1, arg2)
        hookRefresh(arg1, arg2)

        for wid=1,10 do
          local window = ShaguDPS.window[wid]

          -- legacy single-window support
          if wid == 1 and not window then
            window = ShaguDPS.window
          end

          if window then
            local _, chat_border = GetBorderSize("chat")

            window.title:Hide()
            window.title:SetPoint("TOPLEFT", 1, -1)
            window.title:SetPoint("TOPRIGHT", -1, -1)

            CreateBackdrop(window, chat_border, nil, (C.thirdparty.chatbg == "1" and .8))
            CreateBackdropShadow(window)

            local hook = window.Refresh
            if not window.pfRefreshHook then
              window.pfRefreshHook = window.Refresh
              window.Refresh = function(self, arg1, arg2)
                window.pfRefreshHook(self, arg1, arg2)

                -- keep backdrop hidden
                if C.thirdparty.shagudps.skin == "1" then
                  window:SetBackdrop(nil)
                  window.border:SetBackdrop(nil)
                end
              end
            end

            if C.thirdparty.chatbg == "1" and C.chat.global.custombg == "1" then
              local r, g, b, a = GetStringColor(C.chat.global.background)
              window.backdrop:SetBackdropColor(tonumber(r), tonumber(g), tonumber(b), tonumber(a))

              local r, g, b, a = GetStringColor(C.chat.global.border)
              window.backdrop:SetBackdropBorderColor(tonumber(r), tonumber(g), tonumber(b), tonumber(a))
            end

            -- skin buttons
            local buttons = {
              window.btnAnnounce, window.btnReset, window.btnSegment, window.btnMode,
              window.btnDamage, window.btnDPS, window.btnHeal, window.btnHPS,
              window.btnCurrent, window.btnOverall, window.btnWindow, window.btnSettings,
            }

            for _, button in pairs(buttons) do
              if button then
                button:SetHeight(14)
                CreateBackdrop(button, -1, true, .75)
                button:SetBackdropBorderColor(.4,.4,.4,1)

                if button:GetWidth() == 16 then
                  button:SetWidth(14)
                end
              end
            end

            window.border:Hide()
          end
        end
      end
    end
  end)

  -- GreedMeter Damage Meter
  -- Vanilla: https://github.com/iGreed/GreedMeter
  -- GreedMeter builds its windows lazily and supports several of them, so the
  -- frames are resolved at call time. The primary window takes the "damage"
  -- dock slot; a second window (GreedMeter.UI.frames[2]) takes the "threat"
  -- slot so the two tile the panel side-by-side. Docking triggers a
  -- LayoutBars/RefreshFrame so the bars refit the new width.
  HookAddonOrVariable("GreedMeter", function()
    local UI = GreedMeter.UI

    local function frameAt(i)
      return UI and UI.frames and UI.frames[i]
    end
    local function primary()
      return (UI and UI.mainFrame) or getglobal("GreedMeterFrame1")
    end
    local function relayout(frame)
      if not UI then return end
      if UI.LayoutBars then UI:LayoutBars(frame) end
      if UI.RefreshFrame then UI:RefreshFrame(frame) end
    end

    -- Builds a docktable for a window resolved through getframe(). left picks
    -- the left half in split mode; the primary window uses the right half.
    local function BuildDock(name, getframe, left)
      return { "greedmeter", "GreedMeter", name,
        function() -- single: fill the panel
          local frame = getframe()
          if not frame then return end
          frame:ClearAllPoints()
          frame:SetAllPoints(pfUI.chat.right)
          frame:SetWidth(pfUI.chat.right:GetWidth())
          relayout(frame)
        end,
        function() -- dual: take one half
          local frame = getframe()
          if not frame then return end
          frame:ClearAllPoints()
          if left then
            frame:SetPoint("TOPLEFT", pfUI.chat.right, "TOPLEFT", 0, 0)
            frame:SetPoint("BOTTOMRIGHT", pfUI.chat.right, "BOTTOM", 0, 0)
          else
            frame:SetPoint("TOPLEFT", pfUI.chat.right, "TOP", 0, 0)
            frame:SetPoint("BOTTOMRIGHT", pfUI.chat.right, "BOTTOMRIGHT", 0, 0)
          end
          frame:SetWidth(pfUI.chat.right:GetWidth() / 2)
          relayout(frame)
        end,
        function() -- show
          local frame = getframe()
          if frame then frame:Show() relayout(frame) end
        end,
        function() -- hide
          local frame = getframe()
          if frame then frame:Hide() end
        end
      }
    end

    local threatdock = BuildDock("GreedMeterFrame2", function() return frameAt(2) end, true)
    pfUI.thirdparty.meters:RegisterMeter("damage", BuildDock("GreedMeterFrame1", primary, false))

    -- pfUI's dock decides fill-vs-split by whether the threat slot is filled,
    -- not by counting windows, so reconcile that slot whenever GreedMeter adds
    -- or removes one. Only the first two windows fit; any beyond that float.
    local function SyncSecond()
      if not pfUI.thirdparty.meters.damage then return end -- dock disabled
      local has2 = frameAt(2) ~= nil
      if has2 and not pfUI.thirdparty.meters.threat then
        pfUI.thirdparty.meters.threat = threatdock
      elseif not has2 and pfUI.thirdparty.meters.threat == threatdock then
        pfUI.thirdparty.meters.threat = nil
      end
      pfUI.thirdparty.meters:Resize()

      -- match the second window's visibility to the panel (the primary tracks it)
      local f1, f2 = primary(), frameAt(2)
      if f2 then
        if f1 and f1:IsShown() then f2:Show() relayout(f2) else f2:Hide() end
      end
    end

    -- AddFrame and the login-time layout restore both go through
    -- CreateMeterFrame; RemoveFrame handles closing a window.
    local origCreate = UI.CreateMeterFrame
    UI.CreateMeterFrame = function(self, isPrimary, copyFrom)
      local frame = origCreate(self, isPrimary, copyFrom)
      SyncSecond()
      return frame
    end
    local origRemove = UI.RemoveFrame
    UI.RemoveFrame = function(self, frame)
      origRemove(self, frame)
      SyncSecond()
    end
  end)

  -- DPSMate Damage Meter
  -- Vanilla: https://github.com/Geigerkind/DPSMate
  -- TBC: https://github.com/Geigerkind/DPSMateTBC
  HookAddonOrVariable("DPSMate_DPSMate", function()
    local docktable = { "dpsmate", "DPSMate", "DPSMate_DPSMate",
      function() -- single
        DPSMate_DPSMate:ClearAllPoints()
        DPSMate_DPSMate:SetAllPoints(pfUI.chat.right)
        DPSMate_DPSMate:SetWidth(pfUI.chat.right:GetWidth())
        DPSMate_DPSMate_ScrollFrame:ClearAllPoints()
        DPSMate_DPSMate_ScrollFrame:SetWidth(pfUI.chat.right:GetWidth())
        DPSMate_DPSMate_ScrollFrame:SetPoint("TOPLEFT", DPSMate_DPSMate_Head, "BOTTOMLEFT", 0, 0)
        DPSMate_DPSMate_ScrollFrame:SetPoint("BOTTOMRIGHT", pfUI.chat.right, "BOTTOMRIGHT", 0, pfUI.panel.right:GetHeight())
        DPSMate_DPSMate_ScrollFrame_Child:SetWidth(pfUI.chat.right:GetWidth())
        DPSMate_DPSMate_Resize:Hide()
      end,
      function() -- dual
        DPSMate_DPSMate:ClearAllPoints()
        DPSMate_DPSMate:SetPoint("TOPLEFT", pfUI.chat.right, "TOP", 0, 0)
        DPSMate_DPSMate:SetPoint("BOTTOMRIGHT", pfUI.chat.right, "BOTTOMRIGHT", 0, 0)
        DPSMate_DPSMate:SetWidth(pfUI.chat.right:GetWidth() / 2)
        DPSMate_DPSMate_ScrollFrame:ClearAllPoints()
        DPSMate_DPSMate_ScrollFrame:SetWidth(pfUI.chat.right:GetWidth() / 2)
        DPSMate_DPSMate_ScrollFrame:SetPoint("TOPLEFT", DPSMate_DPSMate_Head, "BOTTOMLEFT", 0, 0)
        DPSMate_DPSMate_ScrollFrame:SetPoint("BOTTOMRIGHT", pfUI.chat.right, "BOTTOMRIGHT", 0, pfUI.panel.right:GetHeight())
        DPSMate_DPSMate_ScrollFrame_Child:SetWidth(pfUI.chat.right:GetWidth() / 2)
        DPSMate_DPSMate_Resize:Hide()
      end,
      function() -- show
        DPSMate_DPSMate:Show()
      end,
      function() -- hide
        DPSMate_DPSMate:Hide()
      end
    }

    pfUI.thirdparty.meters:RegisterMeter("damage", docktable)

    if C.thirdparty.dpsmate.skin == "1" then
      if DPSMateSettings then
        -- set DPSMate appearance to match pfUI
        for w in pairs(DPSMateSettings["windows"]) do
          DPSMateSettings["windows"][w]["titlebarheight"] = 20
          DPSMateSettings["windows"][w]["titlebarfontsize"] = 12
          DPSMateSettings["windows"][w]["titlebarfont"] = "Accidental Presidency"
          DPSMateSettings["windows"][w]["titlebaropacity"] = 0

          DPSMateSettings["windows"][w]["titlebarfontcolor"][1] = 1
          DPSMateSettings["windows"][w]["titlebarfontcolor"][2] = 1
          DPSMateSettings["windows"][w]["titlebarfontcolor"][3] = 1

          DPSMateSettings["windows"][w]["barheight"] = 11
          DPSMateSettings["windows"][w]["barfontsize"] = 13
          DPSMateSettings["windows"][w]["bartexture"] = "normTex"
          DPSMateSettings["windows"][w]["barfont"] = "Accidental Presidency"

          DPSMateSettings["windows"][w]["opacity"] = 1
          DPSMateSettings["windows"][w]["contentbgtexture"] = "Solid Background"
          DPSMateSettings["windows"][w]["bgopacity"] = 0
          DPSMateSettings["windows"][w]["borderopacity"] = 0
        end

        if DPSMate.UpdatePointer then
          DPSMate:UpdatePointer()
        end
        DPSMate:InitializeFrames()

        for k, val in pairs(DPSMateSettings["windows"]) do
          local frame = _G["DPSMate_"..val["name"]]
          CreateBackdrop(frame, nil, nil, (C.thirdparty.chatbg == "1" and .8))
          CreateBackdropShadow(frame)

          if C.thirdparty.chatbg == "1" and C.chat.global.custombg == "1" then
            local r, g, b, a = GetStringColor(C.chat.global.background)
            frame.backdrop:SetBackdropColor(tonumber(r), tonumber(g), tonumber(b), tonumber(a))

            local r, g, b, a = GetStringColor(C.chat.global.border)
            frame.backdrop:SetBackdropBorderColor(tonumber(r), tonumber(g), tonumber(b), tonumber(a))
          end
        end
      end
    end
  end)
end)