local side = "back"

local function parseColorInternal(color)
  if colors[color] or colours[color] then
    color = colors[color] or colours[color]
  elseif not (type(colors) == "number" and colors >= 0 and colors <= 65535) then
    error("Invalid colour supplied: Expected color got, "..tostring(color), 3)
  end

  return color
end

--# this turns on and off the colors
local function setInternal(color, state)
  local func = state and colors.combine or colors.subtract
  rs.setBundledOutput(side, func(rs.getBundledOutput(side), color))
end

function allOff()
  rs.setBundledOutput(side, 0)
end

function allOn()
  rs.setBundledOutput(side, 65535)
end

--[[
turn on the supplied colors. example usages:
turnOn("white", colors.orange, "purple", 16)

notice how we can use a combination of ways to say the colour, and we can also supply lots of colours and it will do it for us.
--]]
function turnOn(...)
  for _,color in ipairs({...}) do
    setInternal(parseColorInternal(color), true)
  end
end

--# Same as above only turns off the supplied colors.
function turnOff(...)
  for _,color in ipairs({...}) do
    setInternal(parseColorInternal(color), false)
  end
end

function isOn(color)
  return rs.testBundledInput(side, parseColorInternal(color))
end

--# returns a number representing all the colours that are on
function getOn()
  return rs.getBundledOutput(side)
end

--# returns a number representing all the colours that are off
function getOff()
  return 65535 - rs.getBundledOutput(side)
end

function toggle(...)
  for _,color in ipairs({...}) do
    --# easier to use the internal here
    setInternal(color, not isOn(parseColorInternal(color)))
  end
end

function setside(s)
  side = s
end