--[[ Constants
    * (all lua builtins that don't allow io/executing code)
    color (interface)
    gui (interface)
    multi (interface bound to a processor) no thread module

    callback true/false correct/wrong
]]
local label
local imageHolder

local function index(window, q, callback)
    frame = window:newFrame(0,0,0,0,0,.2,1,.8)
    frame.visibility = 0
    label = window:newTextLabel("     " ..q.title.. "     ",0,0,0,0,0,0,1,.2)
    label.align = ALIGN_CENTER
    label.textColor = color.white
    label.color = color.new("#363ac8")
    label:scaleFont(.4)
    label:centerFont()
    label.drawBorder = false

	local errors = {}
	
	if type(q.zoom) ~= "string" and q.zoom ~= "" then
		table.insert(errors, "Missing 'zoom' fiels for queston! Should be a path to an image.")
	end
	
    if type(q.minzoom) ~= "string" and q.minzoom ~= "" then
        table.insert(errors, "Missing 'minzoom' field for question! Should be a path to an image.")
    end
	
	if type(q.fullimage) ~= "string" and q.fullimage ~= "" then
        table.insert(errors, "Missing 'fullimage' field for question! Should be a path to an image.")
    end
	
	local zooms = {q.zoom, q.minzoom, q.fullimage}

	local index = 1
	local mul = 1
	
    imageHolder = frame:newImageLabel(q.zoom)
    imageHolder:setAspectSize(imageHolder.imageWidth,imageHolder.imageHeight)
    imageHolder:centerX(true)
    imageHolder:centerY(true)
    imageHolder:setDualDim(0,0,imageHolder.imageWidth,imageHolder.imageHeight)
	
	imageHolder:OnEnter(function(self)
		self:setShader(gui.SHADERS.glow)
	end)
	
	imageHolder:OnExit(function(self)
		self:setShader()
	end)
	
	imageHolder:shaderTime(true)
	
	imageHolder:OnReleased(function()
		index = index + 1
		if index == 2 then
            if q["zoom-deduct"] then
			    mul = .5
            end
		elseif index == 3 then
            if q["zoom-deduct"] then
			    mul = .25
            end
		else
			index = 3
		end
		imageHolder:setImage(zooms[index])
        setMultiplier(mul)
	end)
	
    useDefaultHandler(callback)
end

local function update(dt) -- time in seconds that has passed since
    _,_,w,h = imageHolder.parent:getAbsolutes()
    local x,y,w,h = imageHolder:GetSizeAdjustedToAspectRatio(w,h)
    imageHolder:setDualDim(w,h,x,y)
end

return {
    index = index,
    update = update
}