local Animator = Object:extend()

function Animator:new(sprite)
  self.sprite     = sprite
  self.frame      = 1
  self.frameTimer = 0
  self.currentAnimation = ""
  self.animationData = {}

  self.customSpeed = 0

  self:changeToDefaultAnimation()
end

function Animator:setCustomSpeed(customSpeed)
  self.customSpeed = customSpeed or 0
end

function Animator:update(dt)
  if (self.currentAnimation == "") then
    print("warning: no current animation data")
    return 0
  end

  local speed = self.animationData.speed
  if (self.animationData.speed) == -1 then
    speed = self.customSpeed --math.abs(self.xsp / 16)
  end
  self.frameTimer = self.frameTimer + (speed * dt)
  if self.frameTimer > 1 then
    self.frameTimer = 0
    if self.frame == self.animationData.endAt then
      self.frame = self.animationData.loop
    else
      self.frame = self.frame + 1
    end
  end
end

function Animator:getFrame()
  return self.frame
end

function Animator:draw(x, y, r, sx, sy, ox, oy, kx, ky)
  self.sprite:drawFrame(self.frame, x, y, r, sx, sy, ox, oy, kx, ky)
end

function Animator:changeAnimation(name, restart)
  self.currentAnimation   = name
  self.animationData      = self.sprite.data.animations[self.currentAnimation]
  local restart = restart or true

  if (restart) then
    self.frame      = self.animationData.startAt
    self.frameTimer = 0
  end
end

function Animator:changeToDefaultAnimation(restart)
  self:changeAnimation(self.sprite.data.metadata.defaultAnim, restart)
end

return Animator