local BoxVariants = {}

-- Add directional sticky-puller, rigid skewer, and soft all-edge spiky variants
-- for every authored moveable box. All share sprites/collision with their base.
function BoxVariants.addTo(assets)
	local baseBoxes = {}
	for name, properties in pairs(assets) do
		if properties.class == "moveable" and name:match("^box") then
			table.insert(baseBoxes, {name = name, properties = properties})
		end
	end

	local function addVariant(base, prefix, behavior, directory, visualFlag)
		local name = prefix .. base.name
		local properties = {
			class = behavior,
			directory = directory,
			sprites = base.properties.sprites,
			cells = base.properties.cells,
			preload = base.properties.preload,
			synthetic = true,
			baseAsset = base.name,
		}
		properties[visualFlag] = true
		assets[name] = properties
	end

	for _, base in ipairs(baseBoxes) do
		addVariant(base, "sticky_", "sticky", "sticky", "goopy")
		addVariant(base, "skewer_", "skewer", "skewer", "skewer")
		addVariant(base, "spiky_", "spiky", "spiky", "spiky")
	end

	return assets
end

return BoxVariants