-- @docclass
UIRadialProgress = extends(UIWidget, "UIRadialProgress")

function UIRadialProgress.create()
  local progressbar = UIRadialProgress.internalCreate()
  progressbar.progress = 100
  progressbar.radial = false
  return progressbar
end

function UIRadialProgress:onStyleApply(name, node)
  for name,value in pairs(node) do
  	if name == 'radial' then
  		self:setRadial(value)
  	end
  end
end

function UIRadialProgress:setProgress(value)
	self.progress = tonumber(value) or 100
	self:updateProgressbar()
end

function UIRadialProgress:getProgress()
	return self.progress
end

function UIRadialProgress:setRadial(value)
	self.radial = not not value
end

function UIRadialProgress:isRadial()
	return self.radial
end

function UIRadialProgress:updateProgressbar()
	local progress1 = self:getChildById('progress1')
	local progress2 = self:getChildById('progress2')

	if not (progress1 and progress2) then
		return
	end

	local radius = progress1:getImageTextureWidth()
	local height = radius * 2
	local progressRad = self.progress / 100 * math.pi * 2

	-- calculate progressbar heights
	local height1 = radius * 2
	local height2 = 0

	if self.radial then
		if progressRad < math.pi then
			height1 = radius - math.cos(progressRad) * radius
		else
			progressRad = progressRad - math.pi
			height2 = radius - math.cos(progressRad) * radius
		end
	else
		if self.progress < 50 then
			height1 = self.progress / 50 * height
		else
			height2 = (self.progress-50) / 50 * height
		end
	end

	-- set image rects
	if height1 == 0 then
		progress1:hide()
	else
		progress1:show()
		progress1:setImageRect({x=0, y=0, width=radius, height=height1})
		progress1:setImageClip({x=0, y=0, width=radius, height=height1})
	end

	if height2 == 0 then
		progress2:hide()
	else
		progress2:show()
		progress2:setImageRect({x=0, y=height-height2, width=radius, height=height2})
		progress2:setImageClip({x=0, y=height-height2, width=radius, height=height2})
	end
end