--- ${PACKAGE_NAME}
-- @file-author@
-- @project-revision@ @project-hash@
-- @file-revision@ @file-hash@
-- Created: 3/30/2016 12:49 AM
local B = select(2,...).frame
local Module = B:RegisterModule("ObjectiveTracker", _G.VeneerObjectiveWrapper, 'BuffFrame')
local _G, ipairs, max, min, unpack, floor, pairs, tostring, type, band = _G, ipairs, max, min, unpack, floor, pairs, tostring, type, bit.band
local IsResting, UnitXP, UnitXPMax, GetXPExhaustion = IsResting, UnitXP, UnitXPMax, GetXPExhaustion
local UnitLevel, IsQuestWatched, UIParent = UnitLevel, IsQuestWatched, UIParent
local GetAutoQuestPopUp, GetQuestLogCompletionText = GetAutoQuestPopUp, GetQuestLogCompletionText
local PERCENTAGE_STRING, GetQuestProgressBarPercent = PERCENTAGE_STRING, GetQuestProgressBarPercent
local Default, AutoQuest, Quest, Bonus, Cheevs = Module.DefaultHandler, Module.AutoQuest, Module.Quest, Module.Bonus, Module.Cheevs
local InCombatLockdown, format, lshift, CreateFrame = InCombatLockdown, format, bit.lshift, CreateFrame
local IsModifiedClick, ChatEdit_GetActiveWindow = IsModifiedClick, ChatEdit_GetActiveWindow
local print = B.print('Tracker')
local unitLevel = 1
local OBJECTIVE_TRACKER_UPDATE_REASON = OBJECTIVE_TRACKER_UPDATE_REASON
local debug = false

--- Upvalues
local Wrapper = _G.VeneerObjectiveWrapper
local Scroller = Wrapper.scrollArea
local Scroll = _G.VeneerObjectiveScroll
local orderedHandlers = Module.orderedHandlers
local orderedNames = Module.orderedNames

--- Temp values set during updates
local wrapperWidth, wrapperHeight
local scrollWidth, scrollHeight
local previousBlock
local currentBlock
--- todo: source these from config
local itemButtonSize, itemButtonSpacing =  36, 1

local headerHeight, headerColor, headerSpacing = 16, {1,.75,0,1}, 2
local headerbg = {'VERTICAL', 1, 1, 0.5, 0.5, 1, 1, 0.5, 0}
local headerFont, headerSize, headerOutline = [[Interface\Addons\SharedMedia_MyMedia\font\ArchivoNarrow-Bold.ttf]], 14, 'OUTLINE'

local titlebg = {'HORIZONTAL', 1, 0, .7, .25, 1, 0, .7, .125}
local titlebg_daily = {'HORIZONTAL', 0, .7, 1, .25, 0, 1, .7, .125 }
local titlebg_account = {'HORIZONTAL', 0, .45, 1, .25, 0,  .45, 1, .125}
local titleFont, titleSize, titleOutline = [[Interface\Addons\SharedMedia_MyMedia\font\ArchivoNarrow-Bold.ttf]], 16, 'OUTLINE'

local textbg =  {'HORIZONTAL', 0, 0, 0, 0.4, 0, 0, 0, 0 }
local textbg_daily = {'HORIZONTAL', 0, .7, 1, .1, 0, 1, .7, .075 }
local textbg_account = {'HORIZONTAL', 0, .45, 1, 0.4, 0,  .41, 1, .085 }
local textFont, textSize, textOutline = [[Interface\Addons\SharedMedia_MyMedia\font\ArchivoNarrow-Regular.ttf]], 16, 'OUTLINE'


local selectionbg = {'HORIZONTAL', 1, 1, 1, 0, 1, 1, 1, 0.225}
local titleSpacing, textSpacing, blockSpacing = 3, 3, 1
local titleIndent, textIndent,selectionIndent = 2, 5, 50

local lineColors = {
  text = {.5,.75,1},
}

local wrapperMaxWidth, wrapperMaxHeight = 270, 490 -- these are the hard bounds, actual *Height variables are changed
local wrapperHeadFont, wrapperHeadSize, wrapperHeadOutline = [[Interface\Addons\SharedMedia_MyMedia\font\ArchivoNarrow-Bold.ttf]], 16, 'NONE'
local wrapperPosition = {'RIGHT', UIParent, 'RIGHT', -84, 0 }
local rewardSize = 32
local oprint = B.print('Objectives')
local bprint = B.print('Block')
local tprint = B.print('Tracker')
local lprint = B.print('Line')

Default.AddBlock = function(self, block, blockIndex)
  local blockIndex = blockIndex or (self.currentBlock + 1)
  local print = bprint
  local tracker = self.frame
  local info = block.info

  block.index = blockIndex
  block:SetPoint('TOPLEFT', self.frame, 'TOPLEFT', 0, block.offset)
  block:SetPoint('RIGHT', tracker,'RIGHT', 0, 0)
  self.currentBlock = blockIndex
  self.currentAnchor = block
  print('    |cFFFFFF00'..tracker.height..'|r', '|cFF00FF00'..block:GetName()..'|r', block.height, tracker.height)
  tracker.height = tracker.height + block.height
  self.numBlocks = max(self.numBlocks, blockIndex)
  self.actualBlocks = self.actualBlocks + 1
end

--- Used as an iterator of sorts for cascaded tag icon placements (the daily/faction/account icons)
Default.AddTag = function (handler, block, tagInfo, tagPoint, tagAnchor, tagRelative)
  local print = bprint

  for order, tagName in ipairs(block.info.tagInfo) do
    local tag = block[tagName]
    if block.tagCoords[tagName] and tag then
      tag:SetTexCoord(unpack(block.tagCoords[tagName]))
      tag:Show()
      tag:SetPoint(tagPoint, tagAnchor, tagRelative, 0, 0)
      tagPoint, tagAnchor, tagRelative = 'TOPRIGHT', tag, 'TOPLEFT'
    else
      block[tagName]:Hide()
    end
  end

  return tagPoint, tagAnchor, tagRelative
end

--- Adds the given line to the current content and advances the anchor pointer to that new line for the following call.
Default.AddLine = function(handler, block, text, attachment, template)
  local print = lprint
  local lineIndex = block.currentLine + 1
  local line = handler:GetLine(block)
  line:ClearAllPoints()
  line:SetPoint('LEFT', block, 'LEFT', 0, 0)
  line:SetPoint('TOP', block.endPoint, 'BOTTOM', 0, -textSpacing)
  line:SetPoint('RIGHT', block, 'RIGHT', 0, 0)
  line:Show()

  local r, g, b, a = 1, 1, 1, 1
  if lineColors[template] then
    r, g, b = unpack(lineColors[template])
  end

  line.status:SetText(text)
  line.height = floor(line.status:GetStringHeight()+.5) + textSpacing
  line:SetHeight(line.height)
  line.status:SetTextColor(r, g, b, a)

  -- For progressbar and timer lines, status text may be used as the title heading
  if attachment then
    local widgetPosition = 0
    attachment:SetPoint('TOP', line, 'TOP', 0, -block.attachmentHeight)
    attachment:Show()
    if text and #text >= 1 then
      widgetPosition = line.status:GetHeight() + textSpacing
      line.status:SetText(text)
      line.height = floor(line.status:GetStringHeight()+.5) + textSpacing + attachment.height
      print('      - progressbar has text, adjust')
    end
  else
    print('     |cFFFF0088no attachments')
  end

  block.endIndex = line.index
  block.attachmentHeight = block.attachmentHeight + (line.height + textSpacing)
  print('     |cFF0088FFsetting line #'..lineIndex..' for|r', block.info.title, "\n            |cFF0088FFsize:|r", line.height,
    "|cFF0088FFpoint:|r", line:GetPoint(1), "|cFF0088FFwidget:|r", (line.widget and 'Y' or 'N'))
  block.currentLine = lineIndex
  block.endPoint = line
end

--- Creates or retrieves a complete line data object
Default.GetLine = function(handler, block, lineIndex)
  local print = lprint
  local blockIndex = block.index
  local lines = block.lines
  if not lineIndex then
    lineIndex = block.currentLine + 1
    print('fetching the "next" line:', lineIndex)
  else
    print('fetching explicit offset:', lineIndex)
  end

  block.numLines = max(block.numLines, lineIndex)
  print('|cFF00FFFFnumLines:|r', block.numLines, '|cFF00FFFFcurrentLine:|r', block.currentLine)

  if not lines[lineIndex] then
    print('     |cFF00FF88created line #'..lineIndex..' from for '..handler.name..' block #'..blockIndex)
    lines[lineIndex] = CreateFrame('Frame', 'Vn'..handler.name .. blockIndex..'ObjectiveLine'..lineIndex, block, 'VeneerTrackerObjective')
    local line = lines[lineIndex]
    line.index = lineIndex
    line.height = 0
    line.status:SetSpacing(textSpacing)
    line.status:SetPoint('LEFT', line, 'LEFT', textIndent, 0)
    B.SetConfigLayers(line)

    if lines[lineIndex+1] then
      lines[lineIndex+1]:ClearAllPoints()
    end

    if debug then
      for _, region in ipairs(lines[lineIndex].debug) do
        region:Show()
      end
    end

  end
  return lines[lineIndex]
end



--- Creates or retrieves a complete block frame object
Default.GetBlock = function(handler, blockIndex)
  local print = bprint
  local block = handler.usedBlocks[blockIndex]

  if not handler.usedBlocks[blockIndex] then
    if #handler.freeBlocks >= 1 then
      block = handler.freeBlocks[#handler.freeBlocks]
      handler.freeBlocks[#handler.freeBlocks] = nil
    else
      block = CreateFrame('Frame', 'Veneer'..tostring(handler)..'Block'..blockIndex, handler.frame, 'VeneerTrackerBlock')

      local c = Module.Conf.Wrapper
      block.index = blockIndex
      block.lines = {}
      block.numLines = 0
      block.currentLine = 0
      block:SetWidth(c.Width)

      block.title:SetSpacing(c.TitleSpacing)
      block.title:SetPoint('TOP', block, 'TOP', 0, -titleSpacing)

      block.titlebg:SetTexture(1,1,1,1)
      block.titlebg:SetGradientAlpha(unpack(Module.colors.default.titlebg))
      block.titlebg:SetPoint('TOP', block, 'TOP', 0, 0)
      block.titlebg:SetPoint('BOTTOM', block.title, 'BOTTOM', 0, -titleSpacing)

      block.status:SetSpacing(c.TextSpacing)
      block.status:SetPoint('TOP', block.titlebg, 'BOTTOM', 0, -textSpacing)
      block.status:SetPoint('LEFT', block.titlebg, 'LEFT', textIndent, 0)

      block.statusbg:SetPoint('TOP', block.titlebg, 'BOTTOM', 0, 0)
      block.statusbg:SetPoint('BOTTOM', block, 'BOTTOM', 0, 0)
      block.statusbg:SetTexture(1,1,1,1)
      block.statusbg:SetGradientAlpha(unpack(Module.colors.default.textbg))

      block.SelectionOverlay:SetGradientAlpha(unpack(Module.colors.default.selectionbg))
      block.SelectionOverlay:SetPoint('TOPLEFT', selectionIndent, 0)
      block.SelectionOverlay:SetPoint('BOTTOMRIGHT')

      block.icon:SetSize(rewardSize, rewardSize)
      block.icon:SetPoint('TOPRIGHT', block, 'TOPRIGHT', -2, -2)


      --- methods for event handlers

      block.Select = handler.Select
      block.Open = handler.Open
      block.Remove = handler.Remove
      block.Link = handler.Link
      block.clickZone:SetScript('OnMouseUp', function(self, ...) handler.OnMouseUp(block, ...) end)
      block.clickZone:SetScript('OnMouseDown', function(self, ...) handler.OnMouseDown(block, ...) end)
      block.attachmentHeight = 0
      block:ClearAllPoints()

      B.SetConfigLayers(block)

      if debug then
        for _, region in ipairs(block.debug) do
          region:Show()
        end
      end
    end
    handler.usedBlocks[blockIndex] = block
  end
  return handler.usedBlocks[blockIndex]
end

local currentPosition, anchorFrame, anchorPoint
--- Positioning and stuff
local tick = 0
local maxReason = 0
function Module:Update (reason, ...)
  tick = tick + 1
  -- is this the first time updating?
  if maxReason == 0 then
    reason = OBJECTIVE_TRACKER_UPDATE_ALL
  elseif not reason then
    reason = OBJECTIVE_TRACKER_UPDATE_REASON
  end

  local print = tprint
  local updateWrapper = 0
  local hasStuff
  local insertingStuff

  print(format('%d |cFFFF%04X Update()', tick, lshift(reason, 4)), reason, ...)
  currentPosition = 0
  anchorPoint = 'TOP'
  anchorFrame = Scroll

  local wrapperHeight = 0
  for id, handler in pairs(Module.orderedHandlers) do
    local frame = handler.frame

    print(format('|cFF00FFFF%s and(%04X vs %04x+%04x) = %04X|r', handler.name, reason, handler.updateReasonModule, handler.updateReasonEvents, band(reason, handler.updateReasonModule + handler.updateReasonEvents)))
    if band(reason, handler.updateReasonModule + handler.updateReasonEvents) > 0 then
      handler:UpdateTracker(reason, ...)
      print(' |cFF00FF00'..id..'|r', handler.displayName, 'count:', handler.numWatched)
      insertingStuff = true
    else
      print(' |cFFFF0088'..id..'|r', 'no reason to update')
    end

    if handler.numWatched >= 1 then
      hasStuff = true
      currentPosition = currentPosition + 1
      frame.destinationOffset = -wrapperHeight
      if frame.previousOffset ~= wrapperHeight and frame:IsVisible() then
        print(frame.SlideIn.translation)
        local postFrame, postPoint = anchorFrame, anchorPoint
        local delta = frame.destinationOffset - frame.previousOffset
        local _, _, _, _, offset = frame:GetPoint(1)
        print('  |cFF00BBFFstart slide for', delta, 'pixels, from', frame.previousOffset, '(', offset, ')')
        frame.SlideIn.translation:SetTarget(frame)
        frame.SlideIn.translation:SetOffset(0, delta)
        frame.SlideIn:Play()
        for i, b in ipairs(handler.usedBlocks) do
          b.SlideIn.translation:SetOffset(0, delta)
          b.SlideIn:Play()
        end
        frame.SlideIn:SetScript('OnFinished', function()
          print('  |cFF00BBFFsliding finished:', delta, 'pixels covered')
          frame:SetParent(Scroll)
          frame:SetPoint('TOP', Scroll, 'TOP', 0, frame.destinationOffset)
          frame.previousOffset = frame.destinationOffset
          frame.SlideIn:SetScript('OnFinished', nil)
          if Wrapper.destinationHeight then
            Wrapper:SetHeight(Wrapper.destinationHeight)
            Scroller:SetHeight(Wrapper.destinationHeight)
            Scroll:SetHeight(Wrapper.destinationHeight)
            Wrapper.previousHeight = Wrapper.destinationHeight
            Wrapper.destinationHeight = nil
          end

        end)
      else
        print('  |cFF00BBFFpinning to', anchorFrame:GetName(), anchorPoint)
        frame:SetParent(Scroll)
        frame:SetPoint('TOP', Scroll, 'TOP', 0, frame.destinationOffset)
      end

      frame:Show()
      anchorFrame = handler.frame
      anchorPoint = 'BOTTOM'

      print('current frame height:', frame.height)
      wrapperHeight = wrapperHeight + frame.height
      print('|cFFFF0088total height:', wrapperHeight)
    else
      frame:SetPoint('TOP', Scroll, 'TOP', 0, 0)
      frame.destinationOffset = 0
      frame.previousOffset = 0
      handler.frame:Hide()
    end
  end


  if  hasStuff or insertingStuff then
    print('updating height to', wrapperHeight)
    if wrapperHeight > Wrapper.previousHeight then
      Wrapper:SetHeight(wrapperHeight)
      Scroller:SetHeight(wrapperHeight)
      Scroll:SetHeight(wrapperHeight)
      Wrapper.previousHeight = wrapperHeight
      Wrapper.destinationHeight = wrapperHeight
    end
    Scroller:SetVerticalScroll(B.Conf.ObjectiveScroll or 0)
    print('|cFFFF8800Wrapper:', Wrapper:GetSize())
    for i = 1, Wrapper:GetNumPoints() do
      print(' ', Wrapper:GetPoint(i))
    end
    print('  |cFF00FFFFScroller:', Scroller:GetSize())
    for i = 1, Scroller:GetNumPoints() do
      print(' ', Scroller:GetPoint(i))
    end
    print('  |cFF00FFFFScroll:', Scroll:GetSize())
    for i = 1, Scroll:GetNumPoints() do
      print(' ', Scroll:GetPoint(i))
    end

    Wrapper:Show()
    Scroller:Show()
    Scroll:Show()
  end
  Quest.GetClosest()
  --Module.UpdateActionButtons(reason)
end

--- Content generator base
Default.UpdateTracker = function (handler, reason, id, isNew)
  local print = tprint
  local tracker = handler.frame
  local blockIndex = 0
  tracker.previousHeight = tracker.height
  tracker.height = 0

  tracker.title:SetFont(headerFont, headerSize, headerOutline)
  tracker.titlebg:SetHeight(headerHeight)
  tracker.title:SetTextColor(unpack(headerColor))

  handler.updateReason = reason
  handler.numWatched = handler:GetNumWatched()
  handler.currentBlock = 0
  handler.currentAnchor = tracker.titlebg
  local blockPosition = -headerHeight
  for blockIndex = 1, handler.numWatched do
    local currentBlock = handler:UpdateBlock(blockIndex, id, isNew)
    if currentBlock then
      currentBlock.offset = blockPosition
      handler:AddBlock(currentBlock)
      blockPosition = blockPosition - currentBlock.height
    else
      print('  |cFFFF9900END|r @', blockIndex)
      break -- done with quest stuff
    end
  end

  for i = handler.currentBlock+1, handler.numBlocks do
    local used = handler.usedBlocks
    local free = handler.freeBlocks
    print('clean up dead quest block')
    if used[i] then
      used[i]:Hide()
      used[i]:ClearAllPoints()
      free[#free+1]= used[blockIndex]
      used[i] = nil
    end
  end


  if handler.currentBlock >= 1 then
    tracker.height = tracker.height + headerHeight
    tracker:Show()

    if tracker.wasEmpty then
      tracker.headerFade:Play()
      tracker.wasEmpty = nil
    end
    if tracker.height ~= tracker.previousHeight then
      tracker:SetHeight(tracker.height)
    end
    print('    |cFFFFFF00', tracker.height, tracker:GetWidth())
  else
    tracker:Hide()
    tracker.wasEmpty = true
  end

  return tracker.numWatched, tracker.numAll
end

--- Updates the selected block frame to display the given info batch
-- If `previousBlock` is set, it will attempt to anchor to that
-- @param blockNum the ordered block to be updated, not a watchIndex value
-- @param info the reference returned by the GetXInfo functions
-- REMEMBER: t.info and questData[questID] are the same table
Default.UpdateBlock = function (handler, blockIndex, id, added)
  local print = bprint
  print('  Updating |cFF00FF00'..handler.displayName..'|r|cFF00FFFF'..blockIndex..'|r')
  if not blockIndex then
    return
  end
  local info = handler:GetInfo(blockIndex) -- should match up with whatever the internal watch list has
  if not info then
    return
  end
  local frame = handler.frame
  local block = handler:GetBlock(blockIndex)

  block.questID = info.questID
  if id == info.questID then
      --block.questFadeIn:Play()
  end

  block.handler = handler
  block.info = info
  block.mainStyle = info.mainStyle or 'Normal'
  block.subStyle = info.subStyle

  info.blockIndex = blockIndex
  if info.questID then handler.QuestBlock[info.questID] = block end
  if info.questLogIndex then handler.LogBlock[info.questLogIndex] = block end
  if info.watchIndex then handler.WatchBlock[info.watchIndex] = block end
  handler.BlockInfo[blockIndex] = info
  handler:UpdateObjectives(block)

  block.title:SetText(info.title)
  local titleHeight = floor(block.title:GetHeight()+.5)
  local titlebgHeight = titleHeight + titleSpacing*2
  block.titlebg:SetHeight(titlebgHeight)

  local statusHeight = floor(block.status:GetHeight()+.5)
  local statusbgHeight = statusHeight + textSpacing*2
  local attachmentHeight =floor(block.attachmentHeight + .5)

  print('    |cFF0088FFanchor to', handler.currentAnchor:GetName())
  print('    |cFF00FF00attachment:|r', attachmentHeight, '|cFF00FF00title:|r', titlebgHeight, '('.. titleHeight..')')
  --block.titlebg:SetHeight(block.title:GetHeight() + Module.Conf.Wrapper.TitleSpacing)
  block.height = titlebgHeight + attachmentHeight

  if statusHeight > 1 then
    block.height = block.height + statusbgHeight
    print('           status:', statusbgHeight, '('.. statusHeight..')')
  else
    print('      |cFFFF0088             skipped')
  end
  block:SetHeight(block.height)

  print('           |cFFFFFF00height|r:', block.height)
  print('  |cFF00FFFF)|r -> ', block, block:GetHeight())

  block:Show()

  if info.specialItem and not info.itemButton then
    print('    - |cFF00FFFFgenerating item button for info set')
    info.itemButton = Module.SetItemButton(block, info)
  else
    --info.itemButton = nil
  end

  local tagPoint, tagAnchor, tagRelative = 'TOPRIGHT', block, 'TOPRIGHT'

  if info.rewardInfo then
    print('has immediate reward')
    if info.rewardInfo[1].type == 'currency' or info.rewardInfo[1].type == 'item' then
      block.icon:Show()
      block.iconLabel:SetText(info.rewardInfo[1].count)
      block.icon:SetPoint(tagPoint, tagAnchor, tagRelative, -2, -2)
      tagPoint, tagAnchor, tagRelative = 'TOPRIGHT', block.icon, 'TOPLEFT'
      block.icon:SetTexture(info.rewardInfo[1].texture)
    end
  else
    block.icon:Hide()
  end

  if info.selected then
    block.SelectionOverlay:Show()
  else
    block.SelectionOverlay:Hide()
  end
  -- workaround for scrollchild issue where layers fall out of sync: in this case, it's by 1 vertical pixel
  --block.highlight:SetPoint('TOPLEFT', block, 'TOPLEFT', 0, 1)
  --block.lowlight:SetPoint('BOTTOMLEFT', block, 'BOTTOMLEFT', 0, 1)

  tagPoint, tagAnchor, tagRelative = handler:AddTag(block, 'frequencyTag', tagPoint, tagAnchor, tagRelative)
  tagPoint, tagAnchor, tagRelative = handler:AddTag(block, 'typeTag', tagPoint, tagAnchor, tagRelative)
  tagPoint, tagAnchor, tagRelative = handler:AddTag(block, 'completionTag', tagPoint, tagAnchor, tagRelative)

  return block
end




--- Does the main iterations for populating block content.
-- Hooked by corresponding handler functions where additional details need to be sorted.
Default.UpdateObjectives = function(handler, block)
  local print = lprint
  local info = block.info
  print('   |cFF00FF00default objectives routine', block:GetName())
  block.endPoint = block.titlebg
  block.attachmentHeight = 0
  block.currentLine = 0

  -- reset the starting positions
  block.attachmentHeight = 0
  block.endPoint = block.titlebg
  local completionScore, completionMax = 0, 0
  local displayObjectiveHeader = false


  --- The first line is going to be used no matter what, so it is hard-pulled.
  -- It also ensures that we're in the right position for cleaning up the leftover lines.

  block.attachmentHeight = 0

  local text, attachment
  if info.description and #info.description >= 1 then
    print('   |cFF00FFFF  header line:|r', info.description)
    text = info.description
    handler:AddLine(block, text, nil)
  end

  if (info.isComplete or info.numObjectives == 0) and info.completionText then
    print('     overriding line #1 for completion text:', info.completionText)
    text = info.completionText
    Module.AddLine(block, text, nil)
  else
    if info.objectives then
      for i, data in ipairs(info.objectives) do
        local line = handler:GetLine(block)
        displayObjectiveHeader = true
        line.height = 0
        text, attachment = handler:UpdateLine(block, line, data)
        print('     |cFF88FF00#', i, data.type, text)
        handler:AddLine(block, text, attachment)

      end
    end
  end

  for i = block.currentLine + 1, block.numLines do
    print(i, block.numLines)
    print('      - hide |cFFFF0088'..i..'|r', block.lines[i])
    block.lines[i]:ClearAllPoints()
    block.lines[i]:Hide()
  end

  if block.currentLine > 0 then
    block.attachmentHeight = block.attachmentHeight + textSpacing * 2
    print('     |cFF00FF00attachment:', block.attachmentHeight)
  end


  if debug then
    for i, region in ipairs(block.debug) do
      for j = 1, region:GetNumPoints() do
        local _, target = region:GetPoint(j)
        if target:IsVisible() then
          region:Hide()
        else
          region:Show()
        end
      end
    end
  end

  block.completionScore = completionScore / completionMax
end


--- Module-specific display variables
-- * height   - height of whatever display widget is involved in conveying the task
-- * money    - boolean that determines listening for money events or not
-- * progress - number ranging 0 to 2 indicating none/partial/full completion respectively


Default.UpdateLine = function(block, line)
  if line.finished then
    line.progress = 2
  elseif line.quantity > 0 then
    line.progress  = 1
  else
    line.progress = 0
  end
  return line.displayText, line.widget
end
----------
--- Top level methods

--- Queue any active item buttons for update for that frame
local iprint = B.print('ItemButton')
Module.UpdateActionButtons = function(updateReason)
  local print = iprint
  Scroller.snap_upper = 0
  Scroller.snap_lower = 0
  local print = B.print('ItemButton')
  if updateReason then
    print = B.print('IB_'..updateReason)
  end

  local previousItem
  for questID, itemButton in pairs(Quest.itemButtons) do
    local info= Module.Quest.Info[questID]

    print('|cFF00FFFF'.. questID .. '|r', itemButton:GetName())
    local block = Module.Quest.QuestBlock[questID]
    if block then
        -- Dispatch the probe
      if IsQuestWatched(info.questLogIndex) then
        itemButton.previousItem = previousItem
        print('  |cFFFFFF00probing', block:GetName())
        block:SetScript('OnUpdate', function()
          if block:GetBottom() and not InCombatLockdown() then
            print('  '..block:GetName()..' |cFF00FF00probe hit!')
            Module.UpdateBlockAction(block, itemButton, itemButton.previousItem) -- needs to be previousItem from this scope
            block:SetScript('OnUpdate', nil)

          end
        end)
        previousItem = itemButton
      else
        print('hidden block or unwatched quest')
        itemButton.previousItem = nil
        itemButton:Hide()
      end
    elseif itemButton:IsVisible() then
      print('  |cFFFF0088hiding unwatched quest button', itemButton:GetName())
      itemButton.previousItem = nil
      itemButton:Hide()
    else
      print('  |cFFBBBBBBignoring hidden log quest button', itemButton:GetName())
    end
  end
end

Module.UpdateBlockAction = function (block, itemButton)
  local print = iprint
  print('**|cFF0088FF'..itemButton:GetName(), '|r:Update()')
  if itemButton.questID ~= block.info.questID then
    print('** |cFFFF0088mismatched block assignment', itemButton.questID,'<~>', block.info.questID)
    -- something happened between this and last frame, go back and set new probes
    return Module.UpdateActionButtons()
  end

  local previousItem = itemButton.previousItem
  local upper_bound = Scroller:GetTop() + Scroller.snap_upper
  local lower_bound = Scroller:GetBottom() + Scroller.snap_lower + itemButtonSize
  local point, anchor, relative

  if block:GetBottom() < lower_bound then
    print('** ',block:GetName() ,'|cFFFFFF00bottom =', floor(block:GetBottom()+.5), 'threschold =', floor(lower_bound+.5))
    if previousItem then
      print('adjusting', previousItem:GetName())
      previousItem:ClearAllPoints()
      previousItem:SetPoint('BOTTOM', itemButton, 'TOP', 0, itemButtonSpacing)
    end
    itemButton:ClearAllPoints()
    itemButton.x = Wrapper:GetLeft() -4
    itemButton.y = Wrapper:GetBottom()
    point, anchor, relative = 'BOTTOMRIGHT', UIParent, 'BOTTOMLEFT'
    Scroller.snap_lower = Scroller.snap_lower + itemButtonSize + itemButtonSpacing

  elseif block:GetTop() > upper_bound then
    print('** ',block:GetName() ,'|cFFFFFF00top =', floor(block:GetTop()+.5), 'threschold =', floor(upper_bound+.5))
    itemButton:ClearAllPoints()
    if previousItem then
      print('latch onto another piece')
      point, anchor, relative ='TOP', previousItem, 'BOTTOM'
      itemButton.x = 0
      itemButton.y = -itemButtonSpacing
    else
      print('latch at corner', Scroller:GetLeft() -itemButtonSpacing, Scroller:GetTop())
      point, anchor, relative = 'TOPRIGHT', UIParent, 'BOTTOMLEFT'
      itemButton.x = Scroller:GetLeft() -4
      itemButton.y = Scroller:GetTop()
    end
    itemButton:Show()
    Scroller.snap_upper = Scroller.snap_upper - (itemButtonSize + itemButtonSpacing)
  else
    print('** ',block:GetName() ,'|cFF00FF00span =', floor(block:GetBottom()+.5), floor(block:GetTop()+.5), 'threschold =', floor(lower_bound+.5))
    itemButton:ClearAllPoints()
    itemButton.x = block:GetLeft() - itemButtonSpacing
    itemButton.y = block:GetTop()
    point, anchor, relative = 'TOPRIGHT', UIParent, 'BOTTOMLEFT'
  end

  itemButton:SetPoint(point, anchor, relative, itemButton.x, itemButton.y)
  itemButton:Show()
end

Module.UpdateItemButtonCooldown = function(button)

end

Default.Select = function(handler, block)
  Module:Update(handler.watchReasonModule)
end
Default.Open = function(handler, block)
  Module:Update(handler.watchReasonModule)
end
Default.Remove = function(handler, block)
  Module:Update(handler.watchReasonModule)
end
Default.Report = function(handler, block)
  print('Stats:', handler.numWatched,'items tracked,', handler.numBlocks,'blocks assigned.')
end

Default.OnMouseUp = function(self, button)
  print(self.handler.name, self.mainStyle, self.subStyle)
  if button == 'LeftButton' then
    if IsModifiedClick("CHATLINK") and ChatEdit_GetActiveWindow() then
      self.Link(self.handler, self)
    elseif IsModifiedClick("QUESTWATCHTOGGLE") then
      self.Remove(self.handler, self)
    else
      self.Select(self.handler, self)
    end
  elseif button == 'RightButton' then
    self.Open(self.handler, self)
  end
  self.initialButton = nil
  self.modChatLink = nil
  self.modQuestWatch = nil
  Module:Update(self.handler.updateReasonModule)
  print('|cFFFF8800'..tostring(self:GetName())..':MouseUp()|r')
end
Default.OnMouseDown = function(self, button)
  print(self.info.title)
end