local cm = require("core.configmanager");

local function format_host(host, conf)
	if host == "*" then
		return "Global"
	end
	local component_module = conf["component_module"];
	if type(component_module) == "string" then
		if component_module == "component" then
			return string.format("Component %q", host)
		else
			return string.format("Component %q %q", host, component_module)
		end
	else
		return string.format("VirtualHost %q", host)
	end
end

function module.command(arg)

	local config = cm.getconfig();

	print("digraph \"prosody\" {")
	for host, conf in pairs(config) do
		print(string.format("%q [label=%q]", host, format_host(host, conf)));
		local parent = host:match("%.(.*)");
		if parent and rawget(config, parent) then
			print(string.format("%q -> %q", parent, host));
		end
		local disco_items = conf["disco_items"]
		if type(disco_items) == "table" then
			for _, pair in ipairs(disco_items) do
				print(string.format("%q -> %q", host, pair[1]));
			end
		end

	end

	print("}")

	return 0
end