require "/tech/doubletap.lua"

function init()
  storage.rainbowCounter = 0
  self.color1 = 0x95d14f
  self.color2 = 0x50b754
  self.color3 = 0x00a192
end

function transition(color1, color2, position)
        local r1 = color1 / 65536
        r1 = r1 - r1 % 1
        local g1 = (color1 - r1 * 65536) / 256
        g1 = g1 - g1 % 1
        local b1 = color1 - r1 * 65536 - g1 * 256

        local r2 = color2 / 65536
        r2 = r2 - r2 % 1
        local g2 = (color2 - r2 * 65536) / 256
        g2 = g2 - g2 % 1

        local r, g, b =
          r1 + (r2 - r1) * position,
          g1 + (g2 - g1) * position,
          b1 + (color2 - r2 * 65536 - g2 * 256 - b1) * position

        return
          (r - r % 1) * 65536 +
          (g - g % 1) * 256 +
          (b - b % 1)
      end

function uninit()
  tech.setParentDirectives()
end

function update(args)
  storage.rainbowCounter = storage.rainbowCounter + 1
  if storage.rainbowCounter >= 300 then
    storage.rainbowCounter = 0
  end

  if storage.rainbowCounter <= 100 then
    tech.setParentDirectives(string.format("?setcolor=%x", transition(color1,color2,(storage.rainbowCounter)/100)) .. "ff")
  elseif storage.rainbowCounter <= 200 then
    tech.setParentDirectives(string.format("?setcolor=%x", transition(color2,color3,(storage.rainbowCounter-200)/100)) .. "ff")
  elseif storage.rainbowCounter <=300 then
    tech.setParentDirectives(string.format("?setcolor=%x", transition(color3,color1,(storage.rainbowCounter-300)/100)) .. "ff")
  end
end