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-- StartAutoAttack - Vanilla 1.12.1 / Lua 5.0
--
-- Adds two slash commands:
--   /start_auto_attack  - begins auto-attack on your current target, if possible
--   /stop_auto_attack   - stops auto-attack, if currently active
--
-- Intended usage is inside your own ability macros, e.g.:
--
--   /start_auto_attack
--   /cast Judgement(Rank 3)
--
--   /stop_auto_attack
--   /cast Intimidating Shout
--
-- Requires "Attack" (from your spellbook's "General" tab) to be placed somewhere
-- in your action bars. Anywhere on the bars is fine, any page, can be hidden/unused.

local attackActionSlot = 1

local function GetAttackActionSlot()
    local slot = attackActionSlot

    if IsAttackAction(slot) then
        return slot
    end

    slot = 1
    while slot <= 120 do
        if IsAttackAction(slot) then
            attackActionSlot = slot
            return slot
        end
        slot = slot + 1
    end

    DEFAULT_CHAT_FRAME:AddMessage("|cffff3333StartAutoAttack:|r Please place the 'Attack' action (from the 'General' tab of your spellbook) anywhere on your action bars. This addon can not function without it.")
    return nil
end

local function GetAttackStatus()
    local slot = GetAttackActionSlot()

    if not slot then
        return nil
    end

    if IsCurrentAction(slot) then
        return "on";
    else
        return "off";
    end
end

local function StartAutoAttack()
    if GetAttackStatus() == "off" then
        if UnitExists("target") and not UnitIsDead("target") and UnitCanAttack("player", "target") then
            AttackTarget()
        end
    end
end

local function StopAutoAttack()
    if GetAttackStatus() == "on" then
        AttackTarget()
    end
end

SLASH_STARTAUTOATTACK1 = "/start_auto_attack"
SlashCmdList["STARTAUTOATTACK"] = function()
    StartAutoAttack()
end

SLASH_STOPAUTOATTACK1 = "/stop_auto_attack"
SlashCmdList["STOPAUTOATTACK"] = function()
    StopAutoAttack()
end