private class I18NPhase
	super Phase

	redef fun process_annotated_node(nmodule, nat) do
		if not nat.name == "i18n" then return

		if not nmodule isa AModuledecl then
			toolcontext.error(nmodule.location, "Error: The localized language can only be used on module declarations.")
			return
		end

		var domain = nmodule.n_name.n_id.text

		var lang: nullable String = null
		if nat.n_args.length > 0 then
			lang = nat.arg_as_string(toolcontext.modelbuilder)
			if lang == null then return
		end

		var module_dir = nmodule.location.file.filename.dirname.realpath
		var locale_dir = module_dir / "languages"

		if not locale_dir.file_exists then locale_dir.mkdir

		var amodule = nmodule.parent.as(AModule)

		var vi = new StringFinder(domain, locale_dir, toolcontext, amodule)
		vi.enter_visit(amodule)

		var module_name = nmodule.location.file.filename.basename(".nit")

		var pot_path = locale_dir / module_name
		var arr = vi.strings.values.to_a
		var po = new POFile(arr)
		po.write_template(pot_path)

		if lang != null then
			for i in po.strings do
				i.msgstr = i.msgid
			end

			var lang_dir = locale_dir / lang
			if not lang_dir.file_exists then lang_dir.mkdir

			var messages_dir = lang_dir / "LC_MESSAGES"
			if not messages_dir.file_exists then messages_dir.mkdir

			po.write_to_file(messages_dir / module_name)
		end

		var lit = new LiteralVisitor(toolcontext)
		lit.enter_visit(amodule)
	end
end