local textures = {}

textures['Serpent Sting'] = 'Ability_Hunter_Quickshot'
textures['Hunter\'s Mark'] = 'Ability_Hunter_SniperShot'
textures['Arcane Shot'] = 'Ability_ImpalingBolt'
textures['Concussive Shot'] = 'Spell_Frost_Stun'
textures['Throw'] = 'Ability_Throw'

local function getTexture(spellName)
  if textures[spellName] ~= nil then
    return textures[spellName]
  end
  return false
end

local function getSlot(spellTexture)
  for i = 1, 120, 1 do
    if GetActionTexture(i) ~= nil then
      -- print(GetActionTexture(i))
      if (strfind(GetActionTexture(i), spellTexture)) then
        return i
      end
    end
  end
  return 0
end

local function isUsable(spellName)
  local spellTexture = getTexture(spellName)
  if spellTexture then
    local slot = getSlot(spellTexture)
    local usable, _ = IsUsableAction(slot)
    return usable
  else
    return false
  end
end

local function debuffIndex(spellTexture)
  for i = 1, 40 do
    local texturePath = UnitDebuff('target', i)
    if texturePath ~= nil and strfind(texturePath, spellTexture) then
      return i
    end
  end
  return 0
end

local function debuffStacks(spellName)
  local spellTexture = getTexture(spellName)
  if spellTexture then
    local _, stacks = UnitDebuff('target', debuffIndex(spellTexture))
    if stacks == nill then
      return 0
    else
      return stacks
    end
  else
    print(spellName)
    return false
  end
end

function onCooldown(spellName)
  local spellID = 1
  local name, _ = GetSpellName(spellID, 'BOOKTYPE_SPELL')
  while (name) do
    if spellName == name then
      if GetSpellCooldown(spellID, 'BOOKTYPE_SPELL') == 0 then
        return false
      else
        return true
      end
    end
    spellID = spellID + 1
    name, _ = GetSpellName(spellID, 'BOOKTYPE_SPELL')
  end
end

local function cast(spellName)
  CastSpellByName(spellName)
end

local function healthGtThan(percent, health, max)
  if health / max > percent / 100 then
    return true
  end
  return false
end

local function attack()
  if GetUnitName('target') == nil then
    PetFollow()
    TargetNearestEnemy()
    return
  else
    if UnitCanAttack('player', 'target') == nil then
      ClearTarget()
      return
    elseif UnitIsDead('target') == 1 then
      ClearTarget()
      return
    elseif UnitIsPlayer('target') == 1 then
      ClearTarget()
      return
    elseif UnitHealth('target') ~= UnitHealthMax('target') and UnitIsUnit('player', 'targettarget') == nil then
      ClearTarget()
      return
    end

    local mana = UnitMana('player')
    local health = UnitHealth('player')

    if not UnitIsUnit('target', 'pettarget') and UnitExists('pet') and not UnitIsDead('pet') then
      PetAttack()
    end
    if CheckInteractDistance('target', 3) and (not PlayerFrame.inCombat) then
      AttackTarget()
    else
      if isUsable('Hunter\'s Mark') and not buffed('Hunter\'s Mark', 'target') then
        cast('Hunter\'s Mark')
      elseif not IsAutoRepeatAction(47) then
        cast('Auto Shot')
      elseif isUsable('Serpent Sting') and not buffed('Serpent Sting', 'target') and
        healthGtThan(25, UnitHealth('target'), UnitHealthMax('target')) then
        cast('Serpent Sting')
      elseif isUsable('Concussive Shot') and not onCooldown('Concussive Shot') then
        cast('Concussive Shot')
      elseif isUsable('Arcane Shot') and not onCooldown('Arcane Shot') then
        cast('Arcane Shot')
      end
    end
  end
end

function wlob_onLoad()
  SlashCmdList['WLOB'] = attack
  SLASH_WLOB1 = '/wlob'
end