local monitor = {}

-- [[ Requires ]]

local computer = require("computer")
local component = require("component")

-- Used for monitor.test, you can comment these out if you don't use it
local event = require("event")
local thread = require("thread")

-- [[ Constants ]]

local gpu = component.gpu
local screen = component.screen

-- [[ Variables ]]

-- [[ Local functions ]]

local function calculateOptimalResolution()
  local monitorWidth, monitorHeight = screen.getAspectRatio()
  local ar = monitorWidth / monitorHeight

  local maxWidth, maxHeight = gpu.maxResolution()

  if ar == 1.5 then
    return maxWidth, maxHeight
  end

  local height = maxHeight
  local width = ar * 2 * height

  if width > maxWidth then
    local perc = width / maxWidth
    height = height * (1 / perc)
    width = ar * 2 * height
  end

  return width, height
end

-- [[ Exported functions ]]

monitor.fill = function()
  local w, h = calculateOptimalResolution()
  gpu.setResolution(calculateOptimalResolution())

  return w, h
end

monitor.test = function()
  local listener = function(_, _, type)
    if type == "screen" then
      local w, h = monitor.fill()
      require("term").clear()
      gpu.setBackground(0xFFFFFF)
      gpu.set(1,1,(" "):rep(w))
      gpu.set(1,1,(" "):rep(h), true)
      gpu.set(w,1,(" "):rep(h), true)
      gpu.set(1,h,(" "):rep(w))
      gpu.setBackground(0x000000)
      print(w, h)
    end
  end

  event.listen("component_added", listener)
  event.listen("component_removed", listener)
  -- allows us to press ctrl+c to exit cleanly
  event.pull("interrupted")
  event.ignore("component_added", listener)
  event.ignore("component_removed", listener)
end

-- [[ Exporting ]]

return monitor

-- [[ EOF ]]