import "CoreLibs/object"
import "CoreLibs/graphics"
import "CoreLibs/sprites"
import "CoreLibs/timer"

local gfx <const> = playdate.graphics

local playerSprite = nil
local atlas = nil

function gameInit()
  local playerImage = gfx.image.new("img/player")
  assert(playerImage)

  playerSprite = gfx.sprite.new(playerImage)
  playerSprite:moveTo(200, 120) -- (200,120) is the center of the Playdate screen
  playerSprite:add()

  atlas = gfx.imagetable.new("img/bg_atlas")
end

-- Now we'll call the function above to configure our game.
-- After this runs (it just runs once), nearly everything will be
-- controlled by the OS calling `playdate.update()` 30 times a second.

gameInit()

function playdate.update()
  -- Poll the d-pad and move our player accordingly.
  -- (There are multiple ways to read the d-pad; this is the simplest.)
  -- Note that it is possible for more than one of these directions
  -- to be pressed at once, if the user is pressing diagonally.

  if playdate.buttonIsPressed(playdate.kButtonUp) then
    playerSprite:moveBy(0, -2)
  end
  if playdate.buttonIsPressed(playdate.kButtonRight) then
    playerSprite:moveBy(2, 0)
  end
  if playdate.buttonIsPressed(playdate.kButtonDown) then
    playerSprite:moveBy(0, 2)
  end
  if playdate.buttonIsPressed(playdate.kButtonLeft) then
    playerSprite:moveBy(-2, 0)
  end

  -- Call the functions below in playdate.update() to draw sprites and keep
  -- timers updated. (We aren't using timers in this example, but in most
  -- average-complexity games, you will.)

  gfx.sprite.update()
  playdate.timer.updateTimers()
  atlas:drawImage(1, 32, 32)
end