local MDT = MDT
local L = MDT.L
local Compresser = LibStub:GetLibrary("LibCompress")
local Encoder = Compresser:GetAddonEncodeTable()
local Serializer = LibStub:GetLibrary("AceSerializer-3.0")
local LibDeflate = LibStub:GetLibrary("LibDeflate")
local configForDeflate = {
  [1] = { level = 1 },
  [2] = { level = 2 },
  [3] = { level = 3 },
  [4] = { level = 4 },
  [5] = { level = 5 },
  [6] = { level = 6 },
  [7] = { level = 7 },
  [8] = { level = 8 },
  [9] = { level = 9 },
}
MDTcommsObject = LibStub("AceAddon-3.0"):NewAddon("MDTCommsObject", "AceComm-3.0", "AceSerializer-3.0")

-- Lua APIs
local string_char, tremove, tinsert = string.char, table.remove, table.insert
local pairs, type, unpack = pairs, type, unpack
local bit_band, bit_lshift, bit_rshift = bit.band, bit.lshift, bit.rshift

--Based on code from WeakAuras2, all credit goes to the authors
local bytetoB64 = {
  [0] = "a", "b", "c", "d", "e", "f", "g", "h",
  "i", "j", "k", "l", "m", "n", "o", "p",
  "q", "r", "s", "t", "u", "v", "w", "x",
  "y", "z", "A", "B", "C", "D", "E", "F",
  "G", "H", "I", "J", "K", "L", "M", "N",
  "O", "P", "Q", "R", "S", "T", "U", "V",
  "W", "X", "Y", "Z", "0", "1", "2", "3",
  "4", "5", "6", "7", "8", "9", "(", ")"
}

local B64tobyte = {
  a = 0, b = 1, c = 2, d = 3, e = 4, f = 5, g = 6, h = 7,
  i = 8, j = 9, k = 10, l = 11, m = 12, n = 13, o = 14, p = 15,
  q = 16, r = 17, s = 18, t = 19, u = 20, v = 21, w = 22, x = 23,
  y = 24, z = 25, A = 26, B = 27, C = 28, D = 29, E = 30, F = 31,
  G = 32, H = 33, I = 34, J = 35, K = 36, L = 37, M = 38, N = 39,
  O = 40, P = 41, Q = 42, R = 43, S = 44, T = 45, U = 46, V = 47,
  W = 48, X = 49, Y = 50, Z = 51, ["0"] = 52, ["1"] = 53, ["2"] = 54, ["3"] = 55,
  ["4"] = 56, ["5"] = 57, ["6"] = 58, ["7"] = 59, ["8"] = 60, ["9"] = 61, ["("] = 62, [")"] = 63
}

-- This code is based on the Encode7Bit algorithm from LibCompress
-- Credit goes to Galmok (galmok@gmail.com)
local decodeB64Table = {}

local function decodeB64(str)
  local bit8 = decodeB64Table
  local decoded_size = 0
  local ch
  local i = 1
  local bitfield_len = 0
  local bitfield = 0
  local l = #str
  while true do
    if bitfield_len >= 8 then
      decoded_size = decoded_size + 1
      bit8[decoded_size] = string_char(bit_band(bitfield, 255))
      bitfield = bit_rshift(bitfield, 8)
      bitfield_len = bitfield_len - 8
    end
    ch = B64tobyte[str:sub(i, i)]
    bitfield = bitfield + bit_lshift(ch or 0, bitfield_len)
    bitfield_len = bitfield_len + 6
    if i > l then
      break
    end
    i = i + 1
  end
  return table.concat(bit8, "", 1, decoded_size)
end

function MDT:TableToString(inTable, forChat, level)
  local serialized = Serializer:Serialize(inTable)
  local compressed = LibDeflate:CompressDeflate(serialized, configForDeflate[level])
  -- prepend with "!" so that we know that it is not a legacy compression
  -- also this way, old versions will error out due to the "bad" encoding
  local encoded = "!"
  if (forChat) then
    encoded = encoded .. LibDeflate:EncodeForPrint(compressed)
  else
    encoded = encoded .. LibDeflate:EncodeForWoWAddonChannel(compressed)
  end
  return encoded
end

function MDT:StringToTable(inString, fromChat)
  -- if gsub strips off a ! at the beginning then we know that this is not a legacy encoding
  local encoded, usesDeflate = inString:gsub("^%!", "")
  local decoded
  if (fromChat) then
    if usesDeflate == 1 then
      decoded = LibDeflate:DecodeForPrint(encoded)
    else
      decoded = decodeB64(encoded)
    end
  else
    decoded = LibDeflate:DecodeForWoWAddonChannel(encoded)
  end

  if not decoded then
    return "Error decoding."
  end

  local decompressed, errorMsg = nil, "unknown compression method"
  if usesDeflate == 1 then
    decompressed = LibDeflate:DecompressDeflate(decoded)
  else
    decompressed, errorMsg = Compresser:Decompress(decoded)
  end
  if not (decompressed) then
    return "Error decompressing: " .. errorMsg
  end

  local success, deserialized = Serializer:Deserialize(decompressed)
  if not (success) then
    return "Error deserializing " .. deserialized
  end
  return deserialized
end

local function filterFunc(_, event, msg, player, l, cs, t, flag, channelId, ...)
  if flag == "GM" or flag == "DEV" or (event == "CHAT_MSG_CHANNEL" and type(channelId) == "number" and channelId > 0) then
    return
  end
  local newMsg = ""
  local remaining = msg
  local done
  repeat
    local start, finish, characterName, displayName = remaining:find("%[MythicDungeonTools: ([^%s]+) %- ([^%]]+)%]")
    local startLive, finishLive, characterNameLive, displayNameLive = remaining:find("%[MDTLive: ([^%s]+) %- ([^%]]+)%]")
    if (characterName and displayName) then
      characterName = characterName:gsub("|c[Ff][Ff]......", ""):gsub("|r", "")
      displayName = displayName:gsub("|c[Ff][Ff]......", ""):gsub("|r", "")
      newMsg = newMsg .. remaining:sub(1, start - 1)
      newMsg = "|cfff49d38|Hgarrmission:mdt-" .. characterName .. "|h[" .. displayName .. "]|h|r"
      remaining = remaining:sub(finish + 1)
    elseif (characterNameLive and displayNameLive) then
      characterNameLive = characterNameLive:gsub("|c[Ff][Ff]......", ""):gsub("|r", "")
      displayNameLive = displayNameLive:gsub("|c[Ff][Ff]......", ""):gsub("|r", "")
      newMsg = newMsg .. remaining:sub(1, startLive - 1)
      newMsg = newMsg ..
          "|Hgarrmission:mdtlive-" ..
          characterNameLive .. "|h[" .. "|cFF00FF00Live Session: |cfff49d38" .. "" .. displayNameLive .. "]|h|r"
      remaining = remaining:sub(finishLive + 1)
    else
      done = true
    end
  until (done)
  if newMsg ~= "" then
    return false, newMsg, player, l, cs, t, flag, channelId, ...
  end
end

local presetCommPrefix = "MDTPreset"

MDT.liveSessionPrefixes = {
  ["enabled"] = "MDTLiveEnabled",
  ["request"] = "MDTLiveReq",
  ["ping"] = "MDTLivePing",
  ["obj"] = "MDTLiveObj",
  ["objOff"] = "MDTLiveObjOff",
  ["objChg"] = "MDTLiveObjChg",
  ["cmd"] = "MDTLiveCmd",
  ["note"] = "MDTLiveNote",
  ["preset"] = "MDTLivePreset",
  ["pull"] = "MDTLivePull",
  ["week"] = "MDTLiveWeek",
  ["free"] = "MDTLiveFree",
  ["bora"] = "MDTLiveBora",
  ["mdi"] = "MDTLiveMDI",
  ["reqPre"] = "MDTLiveReqPre",
  ["corrupted"] = "MDTLiveCor",
  ["difficulty"] = "MDTLiveLvl",
  ["poiAssignment"] = "MDTPOIAssignment",
}

MDT.dataCollectionPrefixes = {
  ["request"] = "MDTDataReq",
  ["distribute"] = "MDTDataDist",
}

function MDTcommsObject:OnEnable()
  self:RegisterComm(presetCommPrefix)
  for _, prefix in pairs(MDT.liveSessionPrefixes) do
    self:RegisterComm(prefix)
  end
  for _, prefix in pairs(MDT.dataCollectionPrefixes) do
    self:RegisterComm(prefix)
  end
  MDT.transmissionCache = {}
  ChatFrame_AddMessageEventFilter("CHAT_MSG_PARTY", filterFunc)
  ChatFrame_AddMessageEventFilter("CHAT_MSG_PARTY_LEADER", filterFunc)
  ChatFrame_AddMessageEventFilter("CHAT_MSG_RAID", filterFunc)
  ChatFrame_AddMessageEventFilter("CHAT_MSG_RAID_LEADER", filterFunc)
end

--handle preset chat link clicks
hooksecurefunc("SetItemRef", function(link, text)
  if (link and link:sub(0, 19) == "garrmission:mdtlive") then
    local sender = link:sub(21, string.len(link))
    local name, realm = string.match(sender, "(.*)+(.*)")
    sender = name .. "-" .. realm
    --ignore importing the live preset when sender is player, open MDT only
    local playerName, playerRealm = UnitFullName("player")
    playerName = playerName .. "-" .. playerRealm
    if sender == playerName then
      MDT:ShowInterface(true)
    else
      MDT:ShowInterface(true)
      MDT:LiveSession_Enable()
    end
    return
  elseif (link and link:sub(0, 15) == "garrmission:mdt") then
    local sender = link:sub(17, string.len(link))
    local name, realm = string.match(sender, "(.*)+(.*)")
    if (not name) or (not realm) then
      print(string.format(L["receiveErrorUpdate"], sender))
      return
    end
    sender = name .. "-" .. realm
    local preset = MDT.transmissionCache[sender]
    if preset then
      MDT:ShowInterface(true)
      MDT:OpenChatImportPresetDialog(sender, preset)
    end
    return
  end
end)

function MDTcommsObject:OnCommReceived(prefix, message, distribution, sender)
  --[[
        Sender has no realm name attached when sender is from the same realm as the player
        UnitFullName("Nnoggie") returns no realm while UnitFullName("player") does
        UnitFullName("Nnoggie-TarrenMill") returns realm even if you are not on the same realm as Nnoggie
        We append our realm if there is no realm
    ]]
  local name, realm = UnitFullName(sender)
  if not name then return end
  if not realm or string.len(realm) < 3 then
    local _, r = UnitFullName("player")
    realm = r
  end
  local fullName = name .. "-" .. realm

  --standard preset transmission
  --we cache the preset here already
  --the user still decides if he wants to click the chat link and add the preset to his db
  if prefix == presetCommPrefix then
    local preset = MDT:StringToTable(message, false)
    MDT.transmissionCache[fullName] = preset
    --live session preset
    if MDT.liveSessionActive and MDT.liveSessionAcceptingPreset and preset.uid == MDT.livePresetUID then
      if MDT:ValidateImportPreset(preset) then
        MDT:ImportPreset(preset, true)
        MDT.liveSessionAcceptingPreset = false
        MDT.main_frame.SendingStatusBar:Hide()
        if MDT.main_frame.LoadingSpinner then
          MDT.main_frame.LoadingSpinner:Hide()
          MDT.main_frame.LoadingSpinner.Anim:Stop()
        end
        MDT.liveSessionRequested = false
      end
    end
  end

  if prefix == MDT.dataCollectionPrefixes.request then
    MDT.DataCollection:DistributeData()
  end

  if prefix == MDT.dataCollectionPrefixes.distribute then
    local package = MDT:StringToTable(message, false)
    MDT.DataCollection:MergeReceiveData(package)
  end

  if prefix == MDT.liveSessionPrefixes.enabled then
    if MDT.liveSessionRequested == true then
      MDT:LiveSession_SessionFound(fullName, message)
    end
  end

  --pulls
  if prefix == MDT.liveSessionPrefixes.pull then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local pulls = MDT:StringToTable(message, false)
      preset.value.pulls = pulls
      if not preset.value.pulls[preset.value.currentPull] then
        preset.value.currentPull = #preset.value.pulls
        preset.value.selection = { #preset.value.pulls }
      end
      if preset == MDT:GetCurrentPreset() then
        MDT:ReloadPullButtons()
        MDT:SetSelectionToPull(MDT:GetCurrentPull())
        MDT:POI_UpdateAll() --for corrupted spires
        MDT:UpdateProgressbar()
      end
    end
  end

  --corrupted
  if prefix == MDT.liveSessionPrefixes.corrupted then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local offsets = MDT:StringToTable(message, false)
      --only reposition if no blip is currently moving
      if not MDT.draggedBlip then
        preset.value.riftOffsets = offsets
        MDT:UpdateMap()
      end
    end
  end

  --difficulty
  if prefix == MDT.liveSessionPrefixes.difficulty then
    if MDT.liveSessionActive then
      local db = MDT:GetDB()
      local difficulty = tonumber(message)
      if difficulty and difficulty ~= db.currentDifficulty then
        local updateSeasonal
        if ((difficulty >= 10 and db.currentDifficulty < 10) or (difficulty < 10 and db.currentDifficulty >= 10)) then
          updateSeasonal = true
        end
        db.currentDifficulty = difficulty
        MDT.main_frame.sidePanel.DifficultySlider:SetValue(difficulty)
        MDT:UpdateProgressbar()
        if MDT.EnemyInfoFrame and MDT.EnemyInfoFrame.frame:IsShown() then MDT:UpdateEnemyInfoData() end
        MDT:ReloadPullButtons()
        if updateSeasonal then
          MDT:DungeonEnemies_UpdateSeasonalAffix()
          MDT.main_frame.sidePanel.difficultyWarning:Toggle(difficulty)
          MDT:POI_UpdateAll()
          MDT:KillAllAnimatedLines()
          MDT:DrawAllAnimatedLines()
        end
      end
    end
  end

  --week
  if prefix == MDT.liveSessionPrefixes.week then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local week = tonumber(message)
      if preset.week ~= week then
        preset.week = week
        local teeming = MDT:IsPresetTeeming(preset)
        preset.value.teeming = teeming
        if preset == MDT:GetCurrentPreset() then
          local affixDropdown = MDT.main_frame.sidePanel.affixDropdown
          affixDropdown:SetValue(week)
          if not MDT:GetCurrentAffixWeek() then
            MDT.main_frame.sidePanel.affixWeekWarning.image:Hide()
            MDT.main_frame.sidePanel.affixWeekWarning:SetDisabled(true)
          elseif MDT:GetCurrentAffixWeek() == week then
            MDT.main_frame.sidePanel.affixWeekWarning.image:Hide()
            MDT.main_frame.sidePanel.affixWeekWarning:SetDisabled(true)
          else
            MDT.main_frame.sidePanel.affixWeekWarning.image:Show()
            MDT.main_frame.sidePanel.affixWeekWarning:SetDisabled(false)
          end
          MDT:DungeonEnemies_UpdateTeeming()
          MDT:DungeonEnemies_UpdateInspiring()
          MDT:UpdateFreeholdSelector(week)
          MDT:DungeonEnemies_UpdateBlacktoothEvent(week)
          MDT:DungeonEnemies_UpdateSeasonalAffix()
          MDT:DungeonEnemies_UpdateBoralusFaction(preset.faction)
          MDT:POI_UpdateAll()
          MDT:UpdateProgressbar()
          MDT:ReloadPullButtons()
          MDT:KillAllAnimatedLines()
          MDT:DrawAllAnimatedLines()
        end
      end
    end
  end

  if prefix == MDT.liveSessionPrefixes.poiAssignment then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local sublevel, poiIdx, value = unpack(MDT:StringToTable(message, false))
      preset.value.poiAssignments = preset.value.poiAssignments or {}
      preset.value.poiAssignments[sublevel] = preset.value.poiAssignments[sublevel] or {}
      preset.value.poiAssignments[sublevel][poiIdx] = value
      MDT:UpdateMap()
      if sender ~= UnitFullName("player") and MDT:GetCurrentSubLevel() == sublevel then
        local poiFrame = MDT:POI_GetFrameForPOI(poiIdx)
        if poiFrame then UIFrameFlash(poiFrame, 0.5, 1, 1, true, 1, 0); end
      end
    end
  end

  --live session messages that ignore concurrency from here on, we ignore our own messages
  if sender == UnitFullName("player") then return end


  if prefix == MDT.liveSessionPrefixes.request then
    if MDT.liveSessionActive then
      MDT:LiveSession_NotifyEnabled()
    end
  end

  --request preset
  if prefix == MDT.liveSessionPrefixes.reqPre then
    local playerName, playerRealm = UnitFullName("player")
    playerName = playerName .. "-" .. playerRealm
    if playerName == message then
      MDT:SendToGroup(MDT:IsPlayerInGroup(), true, MDT:GetCurrentLivePreset())
    end
  end


  --ping
  if prefix == MDT.liveSessionPrefixes.ping then
    local currentUID = MDT:GetCurrentPreset().uid
    if MDT.liveSessionActive and (currentUID and currentUID == MDT.livePresetUID) then
      local x, y, sublevel = string.match(message, "(.*):(.*):(.*)")
      x = tonumber(x)
      y = tonumber(y)
      sublevel = tonumber(sublevel)
      local scale = MDT:GetScale()
      if sublevel == MDT:GetCurrentSubLevel() then
        MDT:PingMap(x * scale, y * scale)
      end
    end
  end

  --preset objects
  if prefix == MDT.liveSessionPrefixes.obj then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local obj = MDT:StringToTable(message, false)
      MDT:StorePresetObject(obj, true, preset)
      if preset == MDT:GetCurrentPreset() then
        local scale = MDT:GetScale()
        local currentPreset = MDT:GetCurrentPreset()
        local currentSublevel = MDT:GetCurrentSubLevel()
        MDT:DrawPresetObject(obj, nil, scale, currentPreset, currentSublevel)
      end
    end
  end

  --preset object offsets
  if prefix == MDT.liveSessionPrefixes.objOff then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local objIdx, x, y = string.match(message, "(.*):(.*):(.*)")
      objIdx = tonumber(objIdx)
      x = tonumber(x)
      y = tonumber(y)
      MDT:UpdatePresetObjectOffsets(objIdx, x, y, preset, true)
      if preset == MDT:GetCurrentPreset() then MDT:DrawAllPresetObjects() end
    end
  end

  --preset object changed (deletions, partial deletions)
  if prefix == MDT.liveSessionPrefixes.objChg then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local changedObjects = MDT:StringToTable(message, false)
      for objIdx, obj in pairs(changedObjects) do
        preset.objects[objIdx] = obj
      end
      if preset == MDT:GetCurrentPreset() then MDT:DrawAllPresetObjects() end
    end
  end

  --various commands
  if prefix == MDT.liveSessionPrefixes.cmd then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      if message == "deletePresetObjects" then MDT:DeletePresetObjects(preset, true) end
      if message == "undo" then MDT:PresetObjectStepBack(preset, true, true) end
      if message == "redo" then MDT:PresetObjectStepForward(preset, true, true) end
      if message == "clear" then MDT:ClearPreset(preset, true) end
    end
  end

  --note text update, delete, move
  if prefix == MDT.liveSessionPrefixes.note then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local action, noteIdx, text, y = string.match(message, "(.*):(.*):(.*):(.*)")
      noteIdx = tonumber(noteIdx)
      if action == "text" then
        preset.objects[noteIdx].d[5] = text
      elseif action == "delete" then
        tremove(preset.objects, noteIdx)
      elseif action == "move" then
        local x = tonumber(text)
        y = tonumber(y)
        preset.objects[noteIdx].d[1] = x
        preset.objects[noteIdx].d[2] = y
      end
      if preset == MDT:GetCurrentPreset() then MDT:DrawAllPresetObjects() end
    end
  end

  --preset
  if prefix == MDT.liveSessionPrefixes.preset then
    if MDT.liveSessionActive then
      local preset = MDT:StringToTable(message, false)
      MDT.transmissionCache[fullName] = preset
      if MDT:ValidateImportPreset(preset) then
        MDT.livePresetUID = preset.uid
        MDT:ImportPreset(preset, true)
      end
    end
  end

  --freehold
  if prefix == MDT.liveSessionPrefixes.free then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local value, week = string.match(message, "(.*):(.*)")
      value = value == "T" and true or false
      week = tonumber(week)
      preset.freeholdCrew = (value and week) or nil
      if preset == MDT:GetCurrentPreset() then
        MDT:DungeonEnemies_UpdateFreeholdCrew(preset.freeholdCrew)
        MDT:UpdateFreeholdSelector(week)
        MDT:ReloadPullButtons()
        MDT:UpdateProgressbar()
      end
    end
  end

  --Siege of Boralus
  if prefix == MDT.liveSessionPrefixes.bora then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local faction = tonumber(message)
      preset.faction = faction
      if preset == MDT:GetCurrentPreset() then
        MDT:UpdateBoralusSelector()
        MDT:ReloadPullButtons()
        MDT:UpdateProgressbar()
      end
    end
  end

  --MDI
  if prefix == MDT.liveSessionPrefixes.mdi then
    if MDT.liveSessionActive then
      local preset = MDT:GetCurrentLivePreset()
      local updateUI = preset == MDT:GetCurrentPreset()
      local action, data = string.match(message, "(.*):(.*)")
      data = tonumber(data)
      if action == "toggle" then
        MDT:GetDB().MDI.enabled = data == 1 or false
        MDT:DisplayMDISelector()
      elseif action == "beguiling" then
        preset.mdi.beguiling = data
        if updateUI then
          MDT.MDISelector.BeguilingDropDown:SetValue(preset.mdi.beguiling)
          MDT:DungeonEnemies_UpdateSeasonalAffix()
          MDT:DungeonEnemies_UpdateBoralusFaction(preset.faction)
          MDT:UpdateProgressbar()
          MDT:ReloadPullButtons()
          MDT:POI_UpdateAll()
          MDT:KillAllAnimatedLines()
          MDT:DrawAllAnimatedLines()
        end
      elseif action == "freehold" then
        preset.mdi.freehold = data
        if updateUI then
          MDT.MDISelector.FreeholdDropDown:SetValue(preset.mdi.freehold)
          if preset.mdi.freeholdJoined then
            MDT:DungeonEnemies_UpdateFreeholdCrew(preset.mdi.freehold)
          end
          MDT:DungeonEnemies_UpdateBlacktoothEvent()
          MDT:UpdateProgressbar()
          MDT:ReloadPullButtons()
        end
      elseif action == "join" then
        preset.mdi.freeholdJoined = data == 1 or false
        if updateUI then
          MDT:DungeonEnemies_UpdateFreeholdCrew()
          MDT:ReloadPullButtons()
          MDT:UpdateProgressbar()
        end
      end

    end
  end

end

---MakeSendingStatusBar
---Creates a bar that indicates sending progress when sharing presets with your group
---Called once from initFrames()
function MDT:MakeSendingStatusBar(f)
  f.SendingStatusBar = CreateFrame("StatusBar", nil, f)
  local statusbar = f.SendingStatusBar
  statusbar:SetMinMaxValues(0, 1)
  statusbar:SetPoint("LEFT", f.bottomPanel, "LEFT", 5, 0)
  statusbar:SetWidth(200)
  statusbar:SetHeight(20)
  statusbar:SetStatusBarTexture("Interface\\TARGETINGFRAME\\UI-StatusBar")
  statusbar:GetStatusBarTexture():SetHorizTile(false)
  statusbar:GetStatusBarTexture():SetVertTile(false)
  statusbar:SetStatusBarColor(0.26, 0.42, 1)

  statusbar.bg = statusbar:CreateTexture(nil, "BACKGROUND")
  statusbar.bg:SetTexture("Interface\\TARGETINGFRAME\\UI-StatusBar")
  statusbar.bg:SetAllPoints(true)
  statusbar.bg:SetVertexColor(0.26, 0.42, 1)

  statusbar.value = statusbar:CreateFontString(nil, "OVERLAY")
  statusbar.value:SetPoint("CENTER", statusbar, "CENTER", 0, 0)
  statusbar.value:SetFontObject("GameFontNormalSmall")
  statusbar.value:SetJustifyH("CENTER")
  statusbar.value:SetJustifyV("CENTER")
  statusbar.value:SetShadowOffset(1, -1)
  statusbar.value:SetTextColor(1, 1, 1)
  statusbar:Hide()

  if IsAddOnLoaded("ElvUI") then
    local E, L, V, P, G = unpack(ElvUI)
    statusbar:SetStatusBarTexture(E.media.normTex)
  end
end

--callback for SendCommMessage
local function displaySendingProgress(userArgs, bytesSent, bytesToSend)
  MDT.main_frame.SendingStatusBar:Show()
  MDT.main_frame.SendingStatusBar:SetValue(bytesSent / bytesToSend)
  MDT.main_frame.SendingStatusBar.value:SetText(string.format(L["Sending: %.1f"], bytesSent / bytesToSend * 100) .. "%")
  --done sending
  if bytesSent == bytesToSend then
    local distribution = userArgs[1]
    local preset = userArgs[2]
    local silent = userArgs[3]
    --restore "Send" and "Live" button
    if MDT.liveSessionActive then
      MDT.main_frame.LiveSessionButton:SetText(L["*Live*"])
    else
      MDT.main_frame.LiveSessionButton:SetText(L["Live"])
      MDT.main_frame.LiveSessionButton.text:SetTextColor(1, 0.8196, 0)
      MDT.main_frame.LinkToChatButton:SetDisabled(false)
      MDT.main_frame.LinkToChatButton.text:SetTextColor(1, 0.8196, 0)
    end
    MDT.main_frame.LinkToChatButton:SetText(L["Share"])
    MDT.main_frame.LiveSessionButton:SetDisabled(false)
    MDT.main_frame.SendingStatusBar:Hide()
    --output chat link
    if not silent then
      local prefix = "[MythicDungeonTools: "
      local dungeon = MDT:GetDungeonName(preset.value.currentDungeonIdx)
      local presetName = preset.text
      local name, realm = UnitFullName("player")

      --UnitFullName("player") will always return a players name with a capitalised first letter, regardless of whether
      --or not that is actually the case, while UnitFullName("Nnoggie") will return the player name with case respected.
      --This causes a subtle bug for (the few) players who's name does not begin with a capital, where chat links do not
      --work, because line 243 in OnCommReceived respects the case of the name, but here in the sending code we do not.
      --As a result, the entry in MDT.transmissionCache is indexed with case respected, but read on line 225 of this file
      --without respect for case (due to us sending it here, without respect for case). The fix is to subsequently call
      --GetUnitName(name) on the name, in order to get the correct case.

      name = UnitFullName(name)

      local fullName = name .. "+" .. realm
      SendChatMessage(prefix .. fullName .. " - " .. dungeon .. ": " .. presetName .. "]", distribution)
    end
  end
end

---generates a unique random 11 digit number in base64 and assigns it to a preset if it does not have one yet
---credit to WeakAuras2
function MDT:SetUniqueID(preset)
  if not preset.uid then
    local s = {}
    for i = 1, 11 do
      tinsert(s, bytetoB64[math.random(0, 63)])
    end
    preset.uid = table.concat(s)
  end
end

---SendToGroup
---Send current preset to group/raid
function MDT:SendToGroup(distribution, silent, preset)
  MDT:SetThrottleValues()
  preset = preset or MDT:GetCurrentPreset()
  --set unique id
  MDT:SetUniqueID(preset)
  --gotta encode mdi mode / difficulty into preset
  local db = MDT:GetDB()
  preset.mdiEnabled = db.MDI.enabled
  preset.difficulty = db.currentDifficulty
  local export = MDT:TableToString(preset, false, 5)
  MDTcommsObject:SendCommMessage("MDTPreset", export, distribution, nil, "BULK", displaySendingProgress,
    { distribution, preset, silent })
end

---GetPresetSize
---Returns the number of characters the string version of the preset contains
function MDT:GetPresetSize(forChat, level)
  local preset = MDT:GetCurrentPreset()
  local export = MDT:TableToString(preset, forChat, level)
  return string.len(export)
end

function MDT:SetThrottleValues()
  if not _G.ChatThrottleLib then return end
  --4000/16000 is fine but we go safe with 2000/10000
  _G.ChatThrottleLib.MAX_CPS = 2000
  _G.ChatThrottleLib.BURST = 10000
end
