-- Veneer
-- BuffFrame.lua
-- Created: 7/27/2016 8:08 PM
-- %file-revision%
--[[
  Adds progress bars and cooldown swirls to buffbutton frames

  Known Limitations:
  - Individual BuffButton frames are created upon use, making it difficult to do any sort of securestate priming
  - TempEnchant info returns relative values only, and they don't synchronize with aura events
  - BuffButtons can only be hidden/shown by blizzcode, so functions doing that have to be accounted for
--]]

local BUFF_BUTTON_SIZE = 48
local BUFF_PROGRESS_SIZE = 4
local BUFF_PROGRESS_INSET = 1
local BUFF_BUTTON_ZOOM = 0


local plugin = CreateFrame('Frame', 'VeneerBuffFrame', UIParent)
local vn, print = LibStub("LibKraken").register(VeneerController, plugin)


local buttons = {}
local buffTypes = {
  {
    name = 'buff',
    pattern = 'BuffButton(%d)',
    filters = 'HELPFUL',
  },
  {
    name = 'debuff',
    pattern = 'DebuffButton(%d)',
    filters = 'HARMFUL',
  },
  {
    name = 'tempenchant',
    pattern = 'TempEnchant(%d)',
    filters = 'TEMPENCHANT'
  }
}

local textureMapping = {
  [1] = 16,	--Main hand
  [2] = 17,	--Off-hand
  [3] = 18,	--Ranged
}

local tickCounter = {}
local aurasCache = {}
local skinnedFrames = {}
local pendingFrames = {}
local anchors = {}
local expirationCache = {}

local VeneerButton_OnHide = function(self)
  self:SetScript('OnDragStart', self.StartMoving)
  self:SetScript('OnDragStop', self.StopMovingOrSizing)
  self:SetMovable(false)
  self:EnableMouse(false)
  self:RegisterForDrag('LeftButton')
end
local VeneerButton_OnShow = function(self)
  self:SetScript('OnDragStart', self.StartMoving)
  self:SetScript('OnDragStop', self.StopMovingOrSizing)
  self:SetMovable(false)
  self:EnableMouse(false)
  self:RegisterForDrag('LeftButton')
end


local GetVeneer = function(frame)
  local name = frame:GetName()
  if not _G[name..'Veneer'] then

    local veneer = CreateFrame('Frame', name..'Veneer', UIParent)
    local id = frame:GetID()
    veneer:SetAllPoints(frame)
    veneer:SetParent(frame)
    veneer.bg = veneer:CreateTexture()
    veneer.bg:SetColorTexture(1,1,1,0)
    veneer.bg:SetAllPoints(veneer)
    veneer.bg:Show()
    veneer:Hide()
    veneer:EnableMouse(false)

    veneer:SetScript('OnShow', VeneerButton_OnShow)
    veneer:SetScript('OnHide', VeneerButton_OnHide)

    local position = tonumber(name:match("%d"))
    if position == 1 then
      veneer:Show()
    end

    veneer.progress = CreateFrame('Frame', name .. 'VeneerProgress', veneer)
    veneer.progress:Hide()
    veneer.progress:SetPoint('BOTTOMLEFT', veneer, 'BOTTOMLEFT', 3, -6)
    veneer.progress:SetPoint('TOPRIGHT', veneer, 'BOTTOMRIGHT', -3, -1)

    veneer.progress.bg = veneer.progress:CreateTexture(nil, 'BACKGROUND')
    veneer.progress.bg:SetColorTexture(0,0,0,1)
    veneer.progress.bg:SetAllPoints(veneer.progress)

    veneer.progress.fg = veneer.progress:CreateTexture(nil, 'ARTWORK')
    veneer.progress.fg:SetColorTexture(0,1,0,1)
    veneer.progress.fg:SetPoint('BOTTOMLEFT', 1,1)
    veneer.progress.fg:SetPoint('TOP', 0, -1)

    veneer.progress.status = veneer.progress:CreateFontString()
    veneer.progress.status:SetFontObject(VeneerNumberFont)
    veneer.progress.status:SetPoint('TOP')


    veneer.cooldown = CreateFrame('Cooldown', name ..'VeneerCooldown', veneer, 'CooldownFrameTemplate')
    veneer.cooldown:SetAllPoints(frame)
    veneer.cooldown:SetReverse(true)

  end


  return _G[name..'Veneer']
end

--- Set widgets to reflect the passed parameters
local UpdateVeneer = function (frame, duration, expires)
  local veneer = GetVeneer(frame)

  if expires and duration then

    if duration ~= 0 then
      local startTime = (expires - duration)
      local endTime = expires or 0
      print('|cFF0088FF'..frame:GetName()..'|r', duration, expires)
      veneer.progress:Show()
      veneer.elapsed = 0
      veneer.progress:SetScript('OnUpdate', function(self, elapsed)
        veneer.elapsed = veneer.elapsed + elapsed

        local w = floor(veneer.progress:GetWidth()+.5)
        local t = GetTime()
        local progress = (t - startTime) / duration

        local nw = (w-2) - ceil(w * progress)
        if veneer.elapsed >= 0.25 then

          print(progress, nw, w)
          veneer.elapsed = 0.25 - veneer.elapsed
        end
        if (progress >= 1) or not frame:IsVisible() then
          veneer.startTime = nil
          self:Hide()
          self:SetScript('OnUpdate', nil)
        else
          self.fg:SetWidth(nw)
        end
      end)

      veneer.cooldown:Show()
      veneer.cooldown:SetCooldown(startTime, duration)
    else
      print('|cFF00FF88'..frame:GetName()..'|r', 'duration zero')
      veneer.progress:SetScript('OnUpdate', nil)
      veneer.progress:Hide()
      veneer.cooldown:Hide()
    end
  else
    veneer.progress:Hide()
    veneer.cooldown:SetCooldown(0,0)
    veneer.cooldown:Hide()
    print('|cFF88FF00'..frame:GetName()..'|r', 'nil duration')
  end
  veneer:Show()
end


-- Associates skinning elements with said button
local SkinFrame = function(name)
  local frame = _G[name ]
  if skinnedFrames[frame] then
    print('|cFFFF4400Attempting to skin a frame that already went through.|r')
    return
  end

  local icon = _G[name .. 'Icon']
  local border = _G[name .. 'Border']
  local duration = _G[name .. 'Duration']
  local slot = frame:GetID() or 0

  tickCounter[frame] = (tickCounter[frame] or 0) + 1


  print(tickCounter[frame], frame:GetName(), '|cFFFFFF00'..slot..'|r')
  skinnedFrames[frame] = frame
  frame:SetSize(BUFF_BUTTON_SIZE,BUFF_BUTTON_SIZE)

  local offset = BUFF_BUTTON_ZOOM/2
  icon:SetTexCoord(offset, 1 - offset, offset, 1 - offset)
  if border then
    border:SetSize(50,50)
  end
  if duration then
    duration:ClearAllPoints()
    duration:SetPoint('TOP', frame, 'BOTTOM', 0, -8)
    duration:SetFontObject(VeneerNumberFont)
    duration:SetDrawLayer('OVERLAY')

  end

  GetVeneer(frame)

  anchors[frame] = veneer
  print('Initializing', name)
end


--- Provides the number of changed indices for use in deciding between partial and full veneer updates
local CacheCheck = function(frame, ...)
  aurasCache[frame] = aurasCache[frame] or {}
  local hasChange = 0
  local numVals = select('#',...)
  for i = 1,   numVals do
    local arg = select(i, ...)
    if aurasCache[frame][i] ~= arg then
      hasChange = hasChange + 1
    end
    aurasCache[frame][i] = arg
  end
  return hasChange
end

local AuraButton_Update = function(name, index, filter)
  local bName = name..index
  local frame = _G[bName]
  if frame and frame:IsVisible() then
    tickCounter[frame] = (tickCounter[frame] or 0) + 1
    local cacheDiff = CacheCheck(frame, UnitAura(frame.unit, frame:GetID(), frame.filter))
    -- if the name or expirationTime changed
    if (cacheDiff >= 1) then
      print(frame:GetName(), 'diff:', cacheDiff)
      if not skinnedFrames[frame] then
        tinsert(pendingFrames, frame)
      end
      expirationCache[name] = frame.expirationTime
      print(unpack(aurasCache[frame]))
      UpdateVeneer(frame, aurasCache[frame][6], aurasCache[frame][7])
    end

    -- is it a new button?
    if not skinnedFrames[frame] then
      SkinFrame(bName)
    end
  end
end

local BuffFrame_UpdateAllBuffAnchors = function()
  local todo = {}
  if #pendingFrames >= 1 then

    print('|cFFBBFF00AllBuffAnchors|r', #pendingFrames)
    while pendingFrames[1] do
      local frame = tremove(pendingFrames)
      tinsert(todo, frame:GetName())

      -- re-apply custom anchors
    end
    print(table.concat(todo, ', '))
  end
  --BuffButton1
  --DebuffButton1
  --todo: separate frame groups and iterate over them at appropriate times
  if BuffButton1 then
    --TempEnchant1:SetPoint('TOPRIGHT', BuffButton1, 'TOPRIGHT', BuffButton1:GetWidth()+4, 0)
  end

end

local AuraButton_UpdateDuration = function(frame, timeLeft)
  local hours =  floor(timeLeft/3600)
  local minutes = floor(mod(timeLeft, 3600)/60)
  local seconds = floor(mod(timeLeft, 60))
  local timeString = '%ds'
  if timeLeft > 3600 then
    timeString = format('%d:%02d', hours, minutes)
  elseif timeLeft > 60 then
    timeString = format('%d:%02d', minutes, seconds)
  else
    timeString = format('%d', seconds)
  end


  frame.duration:SetText(timeString)
  frame.duration:SetVertexColor(1,1,1)
end

local visibility = {}
local TempEnchantButton_OnHide = function(self)
  local isVisible = self:IsVisible()
  if isVisible ~= visibility[self] then
    print('|cFFFFFF00HIDE|r', self:GetName())
    visibility[self] = isVisible
  end
end

-- Obtains the first instance of Tenchant use

local TemporaryEnchantFrame_Update = function(...)
  local numVals = select('#', ...)
  local numItems = numVals / 4
  if numItems >= 1 then
    for itemIndex = numItems, 1, -1 do
      local frame = _G['TempEnchant'..itemIndex]
      local hasEnchant, timeRemaining, enchantCharges = select((4 * (itemIndex -1)) + 1, ...)


      if hasEnchant then
        local endTime = floor(GetTime()*1000) + timeRemaining


        --print(endTime)
        if endTime ~= expirationCache[frame] then
          if expirationCache[frame] then
            print(endTime, expirationCache[frame], endTime - expirationCache[frame])
          end
          expirationCache[frame] = endTime
          print('push tempenchant timer update', timeRemaining / 1000, GetTime()+(timeRemaining/1000))
          UpdateVeneer(frame, timeRemaining/1000, GetTime()+(timeRemaining/1000))
        end
      else
        GetVeneer(frame):Hide()
      end

    end

  end

end

local BuffFrame_Update = function(...)

end


hooksecurefunc("BuffFrame_Update", BuffFrame_Update)
hooksecurefunc("AuraButton_UpdateDuration", AuraButton_UpdateDuration)
hooksecurefunc("AuraButton_Update", AuraButton_Update)
hooksecurefunc("BuffFrame_UpdateAllBuffAnchors", BuffFrame_UpdateAllBuffAnchors)
hooksecurefunc("TemporaryEnchantFrame_Update", TemporaryEnchantFrame_Update)

-- The TempEnchant frames are hardcoded in the base FrameXML, so get them now
for i = 1, 3 do

  SkinFrame('TempEnchant'..i)
  hooksecurefunc(_G['TempEnchant'..i], "Hide", TempEnchantButton_OnHide)


end

plugin.init = function ()



  plugin.db = vn.db[PLUGIN_NAME]
end