--- ${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 mod = B:RegisterModule("ObjectiveTracker", _G.VeneerObjectiveWrapper, 'BuffFrame')
local ipairs, max, min, unpack, floor, pairs, tostring, type = ipairs, max, min, unpack, floor, pairs, tostring, type
local IsResting, UnitXP, UnitXPMax, GetXPExhaustion = IsResting, UnitXP, UnitXPMax, GetXPExhaustion
local UnitLevel, IsQuestWatched, UIParent = UnitLevel, IsQuestWatched, UIParent
local CreateFrame = CreateFrame
local print = B.print('Objectives')
--------------------------------------------------------------------
--- Global frame layout
--------------------------------------------------------------------

--- Upvalues
local Wrapper = VeneerObjectiveWrapper
local Scroller = Wrapper.scrollArea
local Scroll = VeneerObjectiveScroll
local orderedHandlers = mod.orderedHandlers
local orderedNames = mod.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 titleFont, textFont = [[Interface\Addons\SharedMedia_MyMedia\font\ArchivoNarrow-Bold.ttf]], [[Interface\Addons\SharedMedia_MyMedia\font\ArchivoNarrow-Regular.ttf]]
local titleSize, textSize = 15, 15
local titleOutline, textOutline = "OUTLINE", "OUTLINE"
local titleSpacing, textSpacing = 4, 3
local textIndent = 5
local wrapperMaxWidth, wrapperMaxHeight = 280, 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 headerFont, headerSize, headerHeight = [[Interface\Addons\SharedMedia_MyMedia\font\ArchivoNarrow-Bold.ttf]], 18, 24
local headerOutline, headerColor, headerSpacing = 'OUTLINE', {1,1,1,1}, 2
local wrapperPosition = {'RIGHT', UIParent, 'RIGHT', -84, 0}

--- These are mostly aesthetic choices so it lives here


local Scroller_OnShow = function()
  Wrapper.watchMoneyReasons = 0;
  mod.UpdateWrapper()
  mod.SetEvents()
  for i, region in ipairs(Wrapper.headerComplex) do
    region:Show()
  end
end

local Scroller_OnHide = function()
  local self = Wrapper
  Wrapper:UnregisterAllEvents()
  Wrapper:SetScript('OnEvent', nil)
  for i, region in ipairs(Wrapper.headerComplex) do
    region:Hide()
  end
end

local Scroller_OnMouseWheel = function(self, delta)
  local r = Scroll:GetHeight() - Scroller:GetHeight()
  local s = B.Conf.ObjectiveScroll - delta * floor(r/5+.5)
  local from = self:GetVerticalScroll()
  if s >= r then
    s = r
  elseif s < 1 then
    s = 0
  end
  self:SetVerticalScroll(s)
  B.Conf.ObjectiveScroll = s
  print('|cFF00FF00OnMouseWheel', 'from = ', from, 'scroll =', s, ' range =', r, 'current =', self:GetVerticalScroll())

  mod.UpdateActionButtons('SCROLLING')
end

local WrapperCloseButton_OnClick = function(self)
  if Scroller:IsVisible() then
    Scroller:Hide()
  else
    Scroller:Show()
  end
end

mod.InitializeTrackers = function()


  for i, name in ipairs(orderedNames) do
    if not mod.orderedHandlers[i] then
      if mod.Tracker(name, i) then
        local handler = mod[name]

        local tracker = CreateFrame('Frame', 'Veneer'..name..'Tracker', Scroll, 'VeneerTrackerTemplate')
        tracker.title:SetText(name)
        mod.SetBlockStyle(tracker, 'Tracker', 'Normal')

        handler.Tracker = tracker
        mod.orderedTrackers[i] = tracker
        mod.namedTrackers[name] = tracker
        mod.indexedTrackers[handler] = tracker
        print('created new tracker frames for new handler')


      end
    end
  end

  Scroller:SetScrollChild(Scroll)
  Scroller:SetScript('OnMouseWheel', Scroller_OnMouseWheel)
  Scroller:SetScript('OnShow', Scroller_OnShow)
  Scroller:SetScript('OnHide', Scroller_OnHide)
  Wrapper.close:SetScript('OnClick', WrapperCloseButton_OnClick)
  Wrapper:SetPoint(unpack(wrapperPosition))
  Scroller_OnShow(Scroller)

  mod.UpdateWrapperStyle()
end

mod.InitializeXPTracker = function()
  local XPBar = Wrapper.XPBar
  if UnitLevel('player') == 100 then
    XPBar:Hide()
    return
  end

  --- xp bar
  XPBar:SetWidth(wrapperWidth - Wrapper.close:GetWidth())
  XPBar.bg:SetAllPoints(XPBar)
  XPBar:RegisterEvent('DISABLE_XP_GAIN')
  XPBar:RegisterEvent('ENABLE_XP_GAIN')
  XPBar:SetScript('OnEvent', mod.UpdateXP)

  if not IsXPUserDisabled() then
    mod.EnableXP(XPBar)
  else
    mod.DisableXP(XPBar)
  end

  mod.UpdateXP(XPBar)
end

mod.EnableXP = function(self)
  self:RegisterEvent('PLAYER_XP_UPDATE')
  self:RegisterEvent('PLAYER_LEVEL_UP')
  self:RegisterEvent('PLAYER_UPDATE_RESTING')
  self.bg:SetTexture(0,0,0,.25)
  self:Show()
end

mod.DisableXP = function(self)
  self:UnregisterEvent('PLAYER_XP_UPDATE')
  self:UnregisterEvent('PLAYER_LEVEL_UP')
  self:UnregisterEvent('PLAYER_UPDATE_RESTING')
  self.bg:SetTexture(0.5,0.5,0.5,0.5)
  self:Hide()
end

mod.UpdateXP = function(self, event)
  if event == 'DISABLE_XP_GAIN' then
    mod.DisableXP(self)
  elseif event == 'ENABLE_XP_GAIN' then
    mod.EnableXP(self)
  end

  if not IsXPUserDisabled() then

    local xp = UnitXP('player')
    local xpmax = UnitXPMax('player')
    local rest = GetXPExhaustion()
    self.fg:SetWidth((xp/xpmax) * self:GetWidth())
    if rest then
      self.rested:ClearAllPoints()
      if xp == 0 then
        self.rested:SetPoint('TOPLEFT', self, 'TOPLEFT', 0, 0)
      else
        self.rested:SetPoint('TOPLEFT', self.fg, 'TOPRIGHT', 0, 0)
      end

      if (xp + rest) > xpmax then
        self.rested:SetPoint('BOTTOMRIGHT', self, 'BOTTOMRIGHT', 0, 0)
      else
        self.rested:SetWidth((rest/xpmax) * self:GetWidth())
      end
      self.rested:SetPoint('BOTTOM', self, 'BOTTOM')
      self.rested:Show()
    else
      self.rested:Hide()
    end

    if IsResting() then
      self.bg:SetTexture(.2,.8,.2,.5)
    else
      self.bg:SetTexture(0,0,0,.25)
    end
    self.xpText:SetText(xp .. '/'.. xpmax .. (rest and (' ('..tostring(rest)..')') or ''))
  end
end



local segments = {'Left', 'Right', 'Tile'}
mod.UpdateWrapperStyle = function()
  --[[for _, segment in ipairs(segments) do
    local texture, a1, a2, a3, a4, width = unpack(mod.defaults.Style.Wrapper.BackgroundComplex[segment])
    Wrapper['Background'..segment]:SetAtlas(texture)
    Wrapper['Background'..segment]:SetTexCoord(a1, a2, a3, a4)
    if width then
      Wrapper['Background'..segment]:SetWidth(width)
    end
  end]]
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
mod.UpdateTrackerBlock = function (handler, blockIndex, info)
  local print = B.print('ObjectiveBlockParse')
  print('  |cFF00FFFFUpdateTrackerBlock('..blockIndex..'|r')
  if not blockIndex or not info then
    return
  end

  local mainStyle = 'Normal'
  local subStyle
  local tracker = handler.Tracker

  local t = handler:GetBlock(blockIndex)
  if previousBlock then
    t:SetPoint('TOPLEFT', previousBlock, 'BOTTOMLEFT', 0, 0)
    t:SetPoint('RIGHT', tracker,'RIGHT', 0, 0)
  end
  --print(t:GetName(), t:GetSize())
  --print(t:GetPoint(1))

  t.info = info

  if info.questID then handler.QuestBlock[info.questID] = t end
  if info.questLogIndex then handler.LogBlock[info.questLogIndex] = t end
  if info.watchIndex then handler.WatchBlock[info.watchIndex] = t end

  info.blockIndex = blockIndex
  handler.BlockInfo[blockIndex] = info

  t.Select = handler.Select
  t.Open = handler.Open
  t.Remove = handler.Remove
  t.Link = handler.Link
  t:SetScript('OnMouseUp', handler.OnMouseUp)
  t:SetScript('OnMouseDown', handler.OnMouseDown)
  t.title:SetText(info.title)

  t.attachmentHeight = 0
  if info.isComplete then
    t.status:Show()
    t.status:SetText(info.completionText)
  elseif info.numObjectives >= 1 then
    t.attachmentHeight = textSpacing
    t.status:Show()
    print('  - objective lines:', info.numObjectives, 'can wrap:', t.status:CanWordWrap())

    local text = ''

    --- todo: implement objective displays
     -- in an accumulator loop, call upon handler for the appropriate display frame, each defining:
      -- * height   - height of whatever display widget is involved in conveying the task
      -- * lines    - number of non-wrapped text lines to account for line space; may be discarded depending on things
      -- * money    - boolean that determines listening for money events or not
      -- * progress - number ranging 0 to 2 indicating none/partial/full completion respectively
    text = mod.UpdateObjectives(t, info, text)

    t.status:SetText(text)
    t.status:SetWordWrap(true)

  elseif info.description then
    t.status:SetText(info.description)
    t.status:SetWordWrap(true)
  else
    t.status:SetText(nil)
  end

  if info.isComplete then
    mainStyle = 'Complete'
  end
  if info.superTracked then
    subStyle = 'Super'
  end

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

  if Devian and Devian.InWorkspace() then
    t.debugText:Show()
    t.debugText:SetText(tostring(blockIndex) .. '\n' .. tostring(info.itemButton and info.itemButton:GetName()))
  end

  --- metrics are calculated in SetStyle
  t:SetStyle('TrackerBlock', handler.name, mainStyle, subStyle)
  t:Show()

  print('  |cFF00FFFF)|r -> ', t, t:GetHeight())
  return t
end

mod.UpdateObjectives = function(block, info, text)
  local print = B.print('ObjectiveBlockParse')

  local attachmentHeight = block.attachmentHeight
  if info.description then
    print('  -- has description text:', select('#', info.description), info.description)
    text = info.description
  end
  local completionScore, completionMax = 0, 0
  for o, obj in ipairs(info.objectives) do
    --- achievement criteria
    if obj.flags then


      if bit.band(obj.flags, 0x00000001) > 0 then
        obj.type = 'ProgressBar'
      elseif bit.band(obj.flags, 0x00000002) then
        obj.type = 'Hidden'
        obj.widget = nil
      else
        obj.type = 'Text'
        obj.widget = nil
        text = text .. ((text == '') and "" or "\n") .. obj.text
      end

      print('obj.type =', obj.type)
      print('  ** qtyStr:', obj.quantityString, 'qty:', obj.quantity, 'assetID:', obj.assetID)
      obj.widget = mod.SetWidget(obj, info)
      if obj.finished then
        obj.progress = 2
      elseif obj.quantity > 0 then
        obj.progress  = 1
      else
        obj.progress = 0
      end


      --- none of the above (most quests)
    else
      local line = obj.text
      local color = '00FFFF'
      if obj.finished then
        obj.progress = 2
        color = 'FFFFFF'
      elseif obj.type == 'monster' then
        color = 'FFFF00'
      elseif obj.type == 'item' then
        color = '44DDFF'
      elseif obj.type == 'object' then
        color = 'FF44DD'
      end
      text = text .. ((text == '') and "" or "\n") .. '|cFF'..color.. line .. '|r'
    end

    if obj.widget then

      obj.widget:Show()
      obj.widget:SetPoint('TOPLEFT', block.objectives, 'BOTTOMLEFT', 0, -attachmentHeight)
      print('have a widget, height is', obj.widget.height)
      attachmentHeight = attachmentHeight + obj.widget.height
      completionScore = completionScore + obj.progress
      completionMax = completionMax + 2
    end

  end

  block.completionScore = completionScore / completionMax
  block.attachmentHeight = attachmentHeight

  return text
end

mod.UpdateTracker = function(handler)
  print('|cFF00FF88UpdateTracker(|r|cFFFF4400' .. type(handler) .. '|r :: |cFF88FFFF' .. tostring(handler) .. '|r')
  local tracker = handler.Tracker
  local blockIndex = 0
  local trackerHeight = headerHeight
  local w = 300

  previousBlock = tracker.title
  local numWatched = handler.GetNumWatched()
  local numBlocks = handler.numBlocks
  local actualBlocks = 0
  for watchIndex = 1, 25 do
    blockIndex = blockIndex + 1
    if watchIndex <= numWatched then
      local info = handler:GetInfo(watchIndex)
      if info then
        local currentBlock = mod.UpdateTrackerBlock(handler, blockIndex, info)
        previousBlock = currentBlock
        print('|cFF00FF00'..currentBlock:GetName()..'|r', currentBlock.height)
        trackerHeight = trackerHeight + currentBlock.height
        numBlocks = max(numBlocks, watchIndex)
        actualBlocks = actualBlocks + 1
      else
        print('|cFFFF0000Failed to draw info for index #'..watchIndex)
      end

    elseif watchIndex <= numBlocks then
      local used = handler.usedBlocks
      local free = handler.freeBlocks
      print('clean up dead quest block')
      if used[blockIndex] then
        used[blockIndex]:Hide()
        used[blockIndex]:ClearAllPoints()
        free[#free+1]= used[blockIndex]
        used[blockIndex] = nil
      end
    else
      print('Stopping scan at', blockIndex)
      break -- done with quest stuff
    end
  end
  handler.numWatched = numWatched
  handler.numBlocks = numBlocks
  handler.actualBlocks = actualBlocks
  handler:Report()
  previousBlock = nil
  if numBlocks > 0 then
    tracker.height = trackerHeight
  else
    tracker.height = 0
  end

  print('|cFF00FF88)|r ->', numBlocks, 'blocks; height', tracker.height, 'last block: ')
end

mod.Quest.numButtons = 0
local usedButtons = mod.Quest.itemButtons
local freeButtons = mod.Quest.freeButtons
mod.UpdateWrapper = function()
  wrapperWidth = wrapperMaxWidth
  scrollWidth = wrapperWidth
  local wrapperBlocks = 0
  -- Update scroll child vertical size
  scrollHeight = 0
  for i, handler in ipairs(orderedHandlers) do
    mod.UpdateTracker(handler)
    if handler.actualBlocks >= 1 then
      local tracker = handler.Tracker
      print('setting', handler.Tracker, 'to anchor to offset', -scrollHeight)
      tracker:SetParent(Scroll)
      tracker:SetPoint('TOPLEFT', Scroll, 'TOPLEFT', 0, - scrollHeight)
      tracker:SetSize(wrapperWidth, tracker.height)
      print('adding ', tracker.height)
      scrollHeight = scrollHeight + tracker.height
    end
    wrapperBlocks = wrapperBlocks + handler.actualBlocks
  end
  print('final scrollHeight:', scrollHeight)



  -- Update frame dimensions
  if scrollHeight > wrapperMaxHeight then
    print('  is larger than', wrapperMaxHeight)
    wrapperHeight = wrapperMaxHeight
  else
    wrapperHeight = scrollHeight
    B.Conf.ObjectiveScroll = 0
  end
  scrollWidth = floor(scrollWidth+.5)
  scrollHeight = floor(scrollHeight+.5)
  wrapperWidth = floor(wrapperWidth+.5)
  wrapperHeight = floor(wrapperHeight+.5)
  headerHeight = floor(headerHeight+.5)

  if wrapperBlocks >= 1 then
    for i, region in ipairs(Wrapper.headerComplex) do
      region:Show()
    end
  else
    for i, region in ipairs(Wrapper.headerComplex) do
      region:Hide()
    end
    return
  end
  --wrapperHeight = scrollHeight

  print('|cFFFFFF00params:|r scroller:', scrollWidth, 'x', scrollHeight)
  print('|cFFFFFF00params:|r scroll:', scrollWidth, 'x', scrollHeight)
  print('|cFFFFFF00params:|r wrapper:', wrapperWidth, 'x', wrapperHeight)
  print('|cFFFFFF00params:|r header:', headerHeight)

  mod.SetBlockStyle(Scroller, 'Scroller', 'Normal')
  mod.SetBlockStyle(Scroller, 'Scroll', 'Normal')
  mod.SetBlockStyle(Wrapper, 'Wrapper', 'Normal')

  Scroller:SetSize(wrapperWidth, wrapperHeight)
  Scroller:SetPoint('TOPLEFT', Wrapper, 'TOPLEFT', 0, -headerHeight)
  Scroller:SetPoint('BOTTOMRIGHT', Wrapper, 'BOTTOMRIGHT')


  Scroll:SetSize(scrollWidth, scrollHeight)
  Scroll:SetPoint('TOPLEFT', Scroller, 'TOPLEFT', 0, B.Conf.ObjectiveScroll or 0)
  Scroll:SetPoint('RIGHT', Scroller, 'RIGHT')

  --Scroller:UpdateScrollChildRect()
  Wrapper:SetSize(wrapperWidth, wrapperHeight + headerHeight)

  -- update action buttons
  print('|cFF00FF00'..Scroll:GetName()..'|r:', Scroll:GetWidth(), Scroll:GetHeight(),
    '|cFF00FF00'..Scroller:GetName()..'|r:', Scroller:GetWidth(), Scroller:GetHeight(),
    '|cFF00FF00'..Wrapper:GetName()..'|r:', Wrapper:GetWidth(), Wrapper:GetHeight(),
    '|cFF0088FFvScrollRange|r:', floor(Scroller:GetVerticalScrollRange()+.5)
  )
  mod.UpdateActionButtons('FULL_UPDATE')

end

--- Queue any active item buttons for update for that frame
mod.UpdateActionButtons = function(updateReason)
  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(usedButtons) do
    local info= mod.Quest.Info[questID]

    print('|cFF00FFFF'.. questID .. '|r', itemButton:GetName())
    local block = mod.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!')
            mod.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

mod.UpdateBlockAction = function (block, itemButton)
  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 mod.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

mod.UpdateItemButtonCooldown = function(button)

end