Utility.lua

local AddonName, MDT = ...
MDT.U = {}
local U = MDT.U
local tinsert = table.insert

U.count_if = function(t, func)
  local count = 0

  for k, v in pairs(t) do
    if func(v) then
      count = count + 1
    end
  end

  return count
end

U.do_if = function(t, func)
  local updated = 0

  for k, v in pairs(t) do
    if func.condition(v) then
      func.update(t, k)
      updated = updated + 1
    end
  end

  return updated
end

U.iremove_if = function(t, condition)
  local removed = 0

  for old_index = 1, #t do
    local new_index = old_index - removed
    local entry = t[new_index]
    if entry then
      if condition(entry) then
        removed = removed + 1
        table.remove(t, new_index)
      end
    end
  end

  return removed
end

U.contains = function(t, needle)
  for k, v in pairs(t) do
    if type(v) == type(needle) and v == needle then
      return true
    end
  end

  return false
end

U.copy = function(t)
  local new = {}

  for k, v in pairs(t) do
    if type(v) == "table" then
      new[k] = U.copy(v)
    else
      new[k] = v
    end
  end

  return new
end

U.lerp = function(a, b, alpha)
  return (b - a) * alpha + a
end

U.isInRange = function(value, min, max)
  return (value >= min and value <= max)
end


-- Performance measurement
-- Usage:
-- MDT.U:TMStart("DungeonEnemies_UpdateEnemies")
-- MDT.U:TMStep("ReleaseAll")
-- MDT.U:TMStep("AddBlips")
-- MDT.U:TMEnd()
-- Open VDT to see the results, times are in elapsed milliseconds
local debugTimes
U.TMStart = function(self, segmentName)
  debugTimes = {}
  tinsert(debugTimes, { name = segmentName, time = debugprofilestop() })
end

U.TMStep = function(self, segmentName)
  if not debugTimes then return end
  tinsert(debugTimes, { name = segmentName, time = debugprofilestop() })
end


U.TMEnd = function()
  local stepTimes = {}
  local total = 0
  for segmentIdx, data in ipairs(debugTimes) do
    if segmentIdx > 1 then
      local time = data.time - debugTimes[segmentIdx - 1].time
      stepTimes[segmentIdx] = MDT:Round(time, 1).."ms "..data.name
      total = total + time
    end
  end
  ViragDevTool_AddData(stepTimes)
  ViragDevTool_AddData(total)
end

local function getGroupMembers(reversed, forceParty)
  local unit            = (not forceParty and IsInRaid()) and 'raid' or 'party'
  local numGroupMembers = forceParty and GetNumSubgroupMembers() or GetNumGroupMembers()
  local i               = reversed and numGroupMembers or (unit == 'party' and 0 or 1)
  return function()
    local ret
    if i == 0 and unit == 'party' then
      ret = 'player'
    elseif i <= numGroupMembers and i > 0 then
      ret = unit..i
    end
    i = i + (reversed and -1 or 1)
    return ret
  end
end

U.GetGroupMembers = function()
  local groupMembers = {}
  --iterate over all group members and add them to the list
  for unit in getGroupMembers(false, false) do
    local name = UnitName(unit)
    if name then
      local _, class = UnitClass(unit)
      local _, _, _, classHexString = GetClassColor(class)
      local coloredName = "|c"..classHexString..name.."|r"
      tinsert(groupMembers, coloredName)
    end
  end
  return groupMembers
end

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",
  "(",
  ")"
}

---generates a unique random id
U.GetUniqueId = function(length)
  local s = {}
  for i = 1, 11 do
    tinsert(s, bytetoB64[math.random(0, 63)])
  end
  return table.concat(s)
end