local TweenManager = Object:extend()

local tween = require "game.modules.tweenmanager.libs.tween"

function TweenManager:new(subject)
  self.subject  = subject
  self.timer    = 0

  self.tweens   = {}
  self.targets  = {}
end

function TweenManager:newTween(start, duration, target, easing)
  local newTween = {}
  -- we add the data into a tween wrapper
  newTween.tween = tween.new(duration, self.subject, target, easing)
  newTween.start = self.timer + start -- /!\ START IS RELATIVE TO CURRENT TIME
  newTween.clear = newTween.start + duration

  table.insert(self.tweens, newTween)
end

function TweenManager:update(dt)
  self.timer = self.timer + dt

  for i, tweenWrapper in ipairs(self.tweens) do
    if (self.timer > tweenWrapper.start) then
      tweenWrapper.tween:update(dt)
    end
  end

  self:clearEndedTweens()
end

function TweenManager:clearEndedTweens(dt)
  for i, tweenWrapper in ipairs(self.tweens) do
    if (self.timer > tweenWrapper.clear) then
      table.remove(self.tweens, i)
    end
  end
end

return TweenManager