local BUTTON_PARAMETERS          = {}
BUTTON_PARAMETERS.function_owner = self
BUTTON_PARAMETERS.height         = 650
BUTTON_PARAMETERS.width          = 700
BUTTON_PARAMETERS.position       = { x = -4.775, y = 0.1, z = -0.03 }
BUTTON_PARAMETERS.color          = { 0, 0, 0, 0 }
BUTTON_PARAMETERS.font_color     = { 0, 0, 0, 100 }
BUTTON_PARAMETERS.font_size      = 450

function onSave() return JSON.encode(stats) end

-- load stats and make buttons (left to right)
function onLoad(saved_data)
  stats = JSON.decode(saved_data) or { 1, 1, 1, 1 }

  for i = 1, 4 do
    BUTTON_PARAMETERS.label = stats[i] .. "   "
    BUTTON_PARAMETERS.position.x = BUTTON_PARAMETERS.position.x + 1.91
    BUTTON_PARAMETERS.click_function = attachIndex("button_click", i)
    self.createButton(BUTTON_PARAMETERS)
  end

  self.addContextMenuItem("Reset to 1s", function() updateStats({ 1, 1, 1, 1 }) end)
end

-- helper function to carry index
function attachIndex(click_function, index)
  local fn_name = click_function .. index
  _G[fn_name] = function(obj, player_color, isRightClick)
    _G[click_function](obj, player_color, isRightClick, index)
  end
  return fn_name
end

function button_click(_, _, isRightClick, index)
  stats[index] = math.min(math.max(stats[index] + (isRightClick and -1 or 1), 0), 99)
  changeButton(index)
end

function changeButton(index)
  local font_size = BUTTON_PARAMETERS.font_size
  local whitespace = "   "

  if stats[index] > 9 then
    font_size = BUTTON_PARAMETERS.font_size * 0.65
    whitespace = "     "
  end

  self.editButton({ index = index - 1, label = stats[index] .. whitespace, font_size = font_size })
end

-- formatting of "newStats": {Willpower, Intellect, Fight, Agility}
function updateStats(newStats)
  if newStats and #newStats == 4 then
    stats = newStats
  elseif newStats then
    printToAll("Provided new stats are incomplete or incorrectly formatted.", "Red")
    return
  end

  for i = 1, 4 do changeButton(i) end
end