;;;;
;;;; Naledi ya Africa ("Star of Africa") is an ncurses-based survival game
;;;; set in Africa.
;;;;
;;;; This file holds the user interface.
;;;;
;;;; (c) 2018 Daniel Vedder, MIT license
;;;;

(in-package :naledi-ya-africa)
;;(use-package :croatoan)


(defun start-game ()
	"Start the game logic and UI"
	(croatoan:with-screen (scr :input-blocking *framerate* :enable-colors t
							  :input-echoing nil :cursor-visibility nil
							  :input-reading :unbuffered)
		(splash-screen scr)
		(start-or-connect-to-server scr)
		(user-interface scr)))

(defun splash-screen (scr)
	"Display the splash screen with the `Naledi ya Africa' logo"
	(let* ((width (croatoan:.width scr)) (height (croatoan:.height scr))
			  ;;FIXME fails when not in the naledi directory
			  (logo (load-text-file "LOGO"))
			  (y (halve (- height (length logo))))
			  (xoff (halve (- width 80))))
		(croatoan:clear scr)
		(dolist (l logo)
			(croatoan:move scr y xoff)
			(croatoan:add-string scr l)
			(incf y))
		(croatoan:move scr (1- height) 0)
		(croatoan:add-string scr "Press any key to continue.")
		(croatoan:move scr (1- height) (- width 22))
		(croatoan:add-string scr "(c) 2018 Daniel Vedder")
		(croatoan:event-case (scr event)
			((nil) nil)
			(otherwise (return-from croatoan:event-case)))))

(defun start-or-connect-to-server (scr)
	"Choose whether to start a local game or connect to a remote server"
	(croatoan:clear scr)
	(croatoan:refresh scr)
	(let ((mw (make-instance 'croatoan:dialog-window
				  :title "Welcome!"
				  :center t
				  :border t
				  :width 50
				  :max-item-length 42
				  :input-blocking t
				  :cyclic-selection t
				  :current-item-mark "* "
				  :items '("Start a local game"
							  ;;TODO "Load a saved game"
							  "Connect to a remote server"))))
		;;XXX I have to effectively reimplement (select-item menu) because
		;; the screen grabs all user input and none arrives at the window
		(croatoan:draw-menu mw)
		(croatoan:event-case (scr event)
			((nil) nil)
			((:up :down)
				(croatoan:update-menu mw event)
				(croatoan:draw-menu mw))
			(#\newline
				(cond ((= (croatoan:.current-item-number mw) 0)
						  (start-local-game scr))
					((= (croatoan:.current-item-number mw) 1)
						(connect-remote-game scr)))
				(return-from croatoan:event-case)))))

(defun start-local-game (scr)
	"Start a local game"
	;;TODO choose world size
	(start-server)
	(setf *host* (first *defaulthost*)
		*port* (second *defaulthost*))
	;;give the server time to start
	(while (not (runningp)) ;;TODO replace with `loop'
		(sleep 0.5))
	(connect-server)
	(query-server "signup localuser default")) ;;just use a default user

;;TODO (choose-world-size)

(defun connect-remote-game (scr)
	"Ask the user which server to connect to and do so"
	(setf *host* (query-user scr "Server IP/URL:" :cls T))
	(setf *port* (read-from-string
					 (query-user scr "Server port:"
						 :default (second *defaulthost*) :cls T)))
	(if (user-confirm-p scr (format nil "Connect to ~A:~S?" *host* *port*) T)
		;;TODO ask for username/password!
		(connect-server)
		(start-or-connect-to-server scr)))

(defun user-interface (scr)
	"Create the screen on the ncurses interface and hand over to window functions"
	(let* ((width (croatoan:.width scr)) (height (1- (croatoan:.height scr)))
			  (me (list (round (/ width 4)) (halve height))))
		(croatoan:clear scr)
		(croatoan:refresh scr)
		(croatoan:with-windows ((mapwin :position '(0 0)
									:input-blocking *framerate*
									:border t :width (- width 51)
									:height height)
								   (playerwin :position (list 0 (- width 50))
									   :input-blocking *framerate* :border t
									   :width 50 :height (halve height 'down))
								   (placewin :input-blocking *framerate*
									   :border t
									   :position (list (halve height)
													 (- width 50))
									   :width 50 :height (halve height 'down))
								   (newswin :input-blocking *framerate*
									   :position (list height 0)
									   :width width :height 1))
			(update-ui mapwin playerwin placewin newswin me)
			;;TODO
			(croatoan:event-case (scr event)
				(#\q (disconnect)
					;;terminate if we're running a local game
					(when (member "server-thread" (bt:all-threads) :test
							  #'(lambda (nm th)
									(equalp nm (bt:thread-name th))))
							  (terminate))
					(return-from croatoan:event-case))
				(#\n (croatoan:draw-menu (message-window)))
				;;FIXME change directions to single letters
				(:up (query-server "move north")
					(update-ui mapwin playerwin	placewin newswin me))
				(:down (query-server "move south")
					(update-ui mapwin playerwin placewin newswin me))
				(:left (query-server "move west")
					(update-ui mapwin playerwin placewin newswin me))
				(:right (query-server "move east")
					(update-ui mapwin playerwin placewin newswin me))
				((nil) (update-ui mapwin playerwin placewin newswin me))
				(otherwise (notify (string event)))))))

(defun update-ui (mapwin playerwin placewin newswin me)
	"Update all four UI elements"
	(draw-map mapwin)
	(draw-player-panel playerwin)
	(draw-place-panel placewin me)
	(draw-news-panel newswin))

(defun draw-map (win)
	"Draw a portion of the game map in an ncurses window"
	(setf (croatoan:.color-pair win) '(:white :black))
	(croatoan:box win)
	(croatoan:move win 1 1)
	(let* ((map-width (- (halve (croatoan:.width win) 'floor) 2))
			  (map-height (1- (croatoan:.height win)))
			  (submap (query-server "map" map-width map-height)))
		(dotimes (h map-height)
			(dotimes (w map-width)
				(let ((pch (aref submap w h 0)) (pcol (aref submap w h 1)))
					(croatoan:add-char win pch :color-pair (list pcol black))
					(croatoan:add-char win #\space)))
			(croatoan:move win (1+ h) 1)))
	(croatoan:refresh win))

(defun draw-player-panel (win)
	"Draw a panel with information about the player character."
	;;TODO
	(croatoan:box win)
	(croatoan:move win 1 1)
	(croatoan:add-string win "This is the player panel.")
	(croatoan:refresh win))

(defun draw-place-panel (win me)
	"Draw a panel with information about the player's current location."
	;;TODO replace `describe-patch' with `query-server'
	(let ((descr (break-lines (describe-patch me) 
					 (- (croatoan:.width win) 2))))
		(croatoan:clear win)
		(croatoan:box win)
		(croatoan:move win 1 1)
		(dolist (d descr)
			(croatoan:add-string win d)
			(croatoan:move win
				(1+ (first (croatoan:.cursor-position win))) 1))
		(croatoan:refresh win)))

;;FIXME needs to be overhauled for client/server
(let ((news '("Press h for help.")))
	(defun draw-news-panel (win)
		"Draw a thin panel at the bottom of the screen to display news items."
		(croatoan:clear win)
		(croatoan:move win 0 0)
		;;TODO get news from server
		(croatoan:add-string win (car news))
		(croatoan:refresh win))

	(defun notify (news-string &rest formats)
		"Append a string to the news to notify the user."
		;;TODO needs to be moved to the server
		;;A bit of a kluge, but means that `notify' supports formatting
		(setf news
			(cons (apply #'format (cons NIL (cons news-string formats)))
				news)))

	(defun message-window ()
		"Return a dialog window with the last game messages."
		;;TODO complete
		;;TODO get news from server
		;;XXX use `user-inform' instead of dialog-window?
		(make-instance 'croatoan:dialog-window
			:input-blocking t
			:items (break-lines (mapcar #'(lambda (n) (sconc "* " n)) news) 50)
			:center t
			:border t
			:stacked t
			:layout nil
			:title "Game messages"
			:max-item-length 50
			:message-height 2
			:message-text "Press b to go back.")))
			;;:event-handlers '((#\b #'exit-event-loop)))))
		
;;TODO command/chat window

(defun process-command (event)
	;;TODO
	;;XXX move to another file?
	)