;;;;
;;;; Naledi ya Africa ("Star of Africa") is an ncurses-based survival game
;;;; set in Africa.
;;;;
;;;; This file is responsible for connecting to the server.
;;;;
;;;; (c) 2018 Daniel Vedder, MIT license
;;;;

(in-package :naledi-ya-africa)

(let ((naledi-server NIL))	
	(defun connect-server (&optional (ip *host*) (port *port*))
		"Connect to the specified server"
		;;FIXME I need to catch some exceptions here...
		(setf naledi-server (usocket:socket-connect ip port))
		(if naledi-server
			(notify "Connected to server ~A:~A" ip port)
			(notify "Connection to server ~A:~A failed." ip port)))

	(defun current-server () naledi-server) ;XXX remove after development?
	
	(defun query-server (&rest request)
		"Send a request string to the server and return the answer"
		;;TODO the client should handle errors gracefully!
		(unless naledi-server ;XXX do this with exceptions
			(return-from query-server "You are not connected to a server!"))
		(let ((servstr (usocket:socket-stream naledi-server))
				 (req (string-from-list request)))
			(logf 4 "CLIENT: sending request ~S" request)
			(format servstr "~A~%" req)
			(finish-output servstr)
			(usocket:wait-for-input naledi-server)
			(let ((reply (read-line servstr nil)))
				;;XXX do I need to be able to read multiple lines?
			;; (do* ((raw-reply (multiple-value-list (read-line servstr nil))
			;; 		  (multiple-value-list (read-line servstr nil)))
			;; 		 (reply-line (first raw-reply) (first raw-reply))
			;; 		 (eof (second raw-reply) (second raw-reply))
			;; 		 (reply reply-line (sconc reply reply-line)))
			;; 	((or eof (null reply-line)) ;;FIXME
				(logf 4 "CLIENT: received reply.")
				(if (search "ERROR" reply)
					(error reply)
					(read-from-string reply)))))

	(defun disconnect ()
		"Disconnect from the server"
		(when naledi-server
			(usocket:socket-close naledi-server)
			(setf naledi-server NIL)
			(notify "Disconnected from server."))))