local want_pposix_version = "0.3.0";

local pposix = assert(require "util.pposix");
if pposix._VERSION ~= want_pposix_version then module:log("warn", "Unknown version (%s) of binary pposix module, expected %s", tostring(pposix._VERSION), want_pposix_version); end

local signal = select(2, pcall(require, "util.signal"));
if type(signal) == "string" then
	log("warn", "Couldn't load signal library, won't respond to SIGTERM");
end

local config_get = require "core.configmanager".get;
local logger_set = require "util.logger".setwriter;

module.host = "*"; -- we're a global module

local function write_pidfile()
	local pidfile = config.get("*", "core", "pidfile");
	if pidfile then
		local pf, err = io.open(pidfile, "w+");
		if not pf then
			log("error", "Couldn't write pidfile; %s", err);
		else
			pf:write(tostring(pposix.getpid()));
			pf:close();
		end
	end
end

local logfilename = config_get("*", "core", "log");
if logfilename == "syslog" then
	pposix.syslog_open("prosody");
	pposix.syslog_setminlevel(config.get("*", "core", "minimum_log_level") or "info");
		local syslog, format = pposix.syslog_log, string.format;
		logwriter = function (name, level, message, ...)
					if ... then 
						syslog(level, format(message, ...));
					else
						syslog(level, message);
					end
				end;			
elseif logfilename then
	local logfile = io.open(logfilename, "a+");
	if logfile then
		local write, format, flush = logfile.write, string.format, logfile.flush;
		logwriter = function (name, level, message, ...)
					if ... then 
						write(logfile, name, "\t", level, "\t", format(message, ...), "\n");
					else
						write(logfile, name, "\t" , level, "\t", message, "\n");
					end
					flush(logfile);
				end;
	end
else
	log("debug", "No logging specified, will continue with default");
end

if logwriter then
	local ok, ret = logger_set(logwriter);
	if not ok then
		log("error", "Couldn't set new log output: %s", ret);
	end
end

if not config_get("*", "core", "no_daemonize") then
	local function daemonize_server()
		local logwriter;
		
		
		local ok, ret = pposix.daemonize();
		if not ok then
			log("error", "Failed to daemonize: %s", ret);
		elseif ret and ret > 0 then
			os.exit(0);
		else
			log("info", "Successfully daemonized to PID %d", pposix.getpid());
			write_pidfile();
		end
	end
	module:add_event_hook("server-starting", daemonize_server);
else
	write_pidfile();
	-- Not going to daemonize, but let's write the pidfile anyway
end

-- Set signal handler
if signal.signal then
	signal.signal("SIGTERM", function ()
		log("warn", "Received SIGTERM...");
		unlock_globals();
		if prosody_shutdown then
			prosody_shutdown("Received SIGTERM");
		else
			log("warn", "...no prosody_shutdown(), ignoring.");
		end
		lock_globals();
	end);
end