function gadget:GetInfo()
  return {
    name      = "Antigravtest",
    desc      = "blah",
    author    = "quantum",
    date      = "Jan 8, 2007",
    license   = "GNU GPL, v2 or later",
    layer     = 0,
    enabled   = true  --  loaded by default?
  }
end

local x, y, z = nil
local unitList = {}
local first = 1
local roachid



function gadget:UnitFinished(uid, ud, ut)
  x, y, z = Spring.GetUnitPosition(uid)
  local udid = Spring.GetUnitDefID(uid)
  if UnitDefs[udid].name ~= "antigravbomb" then
    table.insert(unitList, {uid, x, y, z})
    Spring.SendMessage("x "..x.." y "..y.." z "..z)
    Spring.SendMessage("unitid "..uid)
  end
end

function gadget:GameFrame(n)
  if n == 30*30 then
    for i, unit in ipairs(unitList) do
      Spring.CreateUnit("antigravbomb", unit[2]+1, unit[3]-10, unit[4], 0, 0)
      local units = Spring.GetAllUnits()
      for _, uid in ipairs(units) do
        local udid = Spring.GetUnitDefID(uid)
        if UnitDefs[udid].name == "antigravbomb" then
          Spring.DestroyUnit(uid, true, false, uid)
        end
      end
    end
  end 
  if (n < 30*45) and (n > 29*30) then
    for i, unit in ipairs(unitList) do
      Spring.SetUnitPhysics(unit[1], unit[2], unit[3]+1, unit[4], 0, 1, 0, 0, 0, 0)
      unitList[i][3] = unit[3]+1
    end
  end
end