FTD Stagger Fire Multiple Turrets

-- Stagger Fire Turret Controller
-- Use Local Weapon Controllers as usual for targeting, but set their Max_Firerate to 0

-- SET THESE FOR USE
turret_ID = {1, 2, 3} -- 1 for first turret placed, 2 for second, etc...
interval = 0.250      -- in seconds; use multiples of 0.025s since 1 physics frame = 0.025s
mainframe_index = 0   -- 0 for first mainframe placed, 1 for second, etc...

-- DON'T CHANGE ANYTHING BELOW UNLESS YOU KNOW WHAT YOU ARE DOING
-- initialize global variables
next_weapon = 0
weapon_count = 0
last_fired_time = 0
initialize = true
weapon_ID = {}

function Update(I)
  if (initialize == true) then
    for i= 1,#turret_ID do
      local_weapon_count = I:GetWeaponCountOnSubConstruct(turret_ID[i])
      for w = 0,local_weapon_count do
        if (I:GetWeaponInfoOnSubConstruct(turret_ID[i], w)['Valid'] == true) then
          if (I:GetWeaponInfoOnSubConstruct(turret_ID[i], w)['WeaponType'] == 0) then
            weapon_ID[weapon_count] = {turret_ID[i], w}
            weapon_count = weapon_count + 1
          end
        end
      end
    end
    initialize = false
  end

  if (I:GetAIFiringMode(mainframe_index) == 'On') then
    if (I:GetNumberOfTargets(mainframe_index) > 0) then
      if (I:GetGameTime() - last_fired_time >= interval) then
        if (I:FireWeaponOnSubConstruct(weapon_ID[next_weapon][1],weapon_ID[next_weapon][2],0)) then
          last_fired_time = I:GetGameTime()
          next_weapon = (next_weapon + 1) % weapon_count
        else
          for i=0,#weapon_ID do
            if (I:FireWeaponOnSubConstruct(weapon_ID[i][1],weapon_ID[i][2],0)) then
              last_fired_time = I:GetGameTime()
              break
            end
          end
        end
      end
    end
  end
end