xdecor.box = {
	slab_y = function(height, shift)
		return { -0.5, -0.5+(shift or 0), -0.5, 0.5, -0.5+height+(shift or 0), 0.5 }
	end,
	slab_z = function(depth)
		return { -0.5, -0.5, -0.5+depth, 0.5, 0.5, 0.5 }
	end,
	bar_y = function(radius)
		return { -radius, -0.5, -radius, radius, 0.5, radius }
	end,
	cuboid = function(radius_x, radius_y, radius_z)
		return { -radius_x, -radius_y, -radius_z, radius_x, radius_y, radius_z }
	end
}

xdecor.nodebox = {
	regular = { type = "regular" },
	null = { type = "fixed", fixed = { 0, 0, 0, 0, 0, 0 } }
}

xdecor.pixelnodebox = function(size, boxes)
	local fixed = {}
	for _, box in pairs(boxes) do
		local x, y, z, w, h, l = unpack(box)
		fixed[#fixed+1] = {
			(x / size) - 0.5,
			(y / size) - 0.5,
			(z / size) - 0.5,
			(w / size) - 0.5,
			(h / size) - 0.5,
			(l / size) - 0.5
		}
	end
	return { type = "fixed", fixed = fixed }
end

local mt = {}
mt.__index = function(table, key)
	local ref = xdecor.box[key]
	local ref_type = type(ref)

	if ref_type == "function" then
		return function(...)
			return { type = "fixed", fixed = ref(...) }
		end
	elseif ref_type == "table" then
		return { type = "fixed", fixed = ref }
	elseif ref_type == "nil" then
		error(key.."could not be found among nodebox presets and functions")
	end

	error("unexpected datatype "..tostring(type(ref)).." while looking for "..key)
end

setmetatable(xdecor.nodebox, mt)