1 files changed, 147 insertions, 0 deletions
diff --git a/net/ricketyspace/ror/thirteen/server.rkt b/net/ricketyspace/ror/thirteen/server.rkt
new file mode 100644
index 0000000..2e57867
--- /dev/null
+++ b/net/ricketyspace/ror/thirteen/server.rkt
@@ -0,0 +1,147 @@
+#lang racket
+
+(provide launch-guess-server)
+
+(require 2htdp/image 2htdp/universe "shared.rkt")
+
+(struct interval (small big) #:transparent)
+
+;; paction -> 'c' or 'a'
+;; gaction -> 'c' or 'g'
+(struct server-state  (interval clue guess paction gaction clients done))
+
+(define u0 (server-state (interval LOWER UPPER) "" #f "c" "" 1 #f))
+
+(define (launch-guess-server)
+  (universe #f
+            (state #t)
+            (on-new connect)
+            (on-msg handle-msg)))
+
+(define (connect u client)
+  (cond [(false? u)
+         (make-bundle
+          u0
+          (list (make-mail client (client-msg PLAYER "" #f "c" #f)))
+          '())]
+        [(= (server-state-clients u) 1)
+         (make-bundle
+          (server-state
+           (server-state-interval u) (server-state-clue u)
+           (server-state-guess u) (server-state-paction u)
+           "g" 2 #f)
+          (list (make-mail client (client-msg GUESSER "" #f "g" #f)))
+          '())]
+        [else (make-bundle u empty (list client))]))
+
+(define (handle-msg u client s-msg)
+  (cond [(not (server-msg? s-msg)) (make-bundle u empty (list client))]
+        [(= (server-msg-type s-msg) PLAYER)
+         (handle-msg-player u client s-msg)]
+        [(= (server-msg-type s-msg) GUESSER)
+         (handle-msg-guesser u client s-msg)]
+        [else (make-bundle u empty (list client))]))
+
+(define (handle-msg-player u client s-msg)
+  (define (set-paction paction)
+    (let ([interval (server-state-interval u)]
+          [clue (server-state-clue u)]
+          [guess (server-state-guess u)]
+          [gaction (server-state-gaction u)]
+          [clients (server-state-clients u)])
+      (server-state interval clue guess paction gaction clients #f)))
+  (define (set-clue clue)
+    (let ([interval (server-state-interval u)]
+          [guess (server-state-guess u)]
+          [gaction (server-state-gaction u)]
+          [clients (server-state-clients u)]
+          [done (server-state-done u)])
+      (server-state interval clue guess "c" gaction clients done)))
+  (define (set-done)
+    (let ([interval (server-state-interval u)]
+          [guess (server-state-guess u)]
+          [gaction (server-state-gaction u)]
+          [clients (server-state-clients u)])
+      (server-state interval "" guess "" gaction clients #t)))
+  (define (mail clue guess action done)
+    (list (make-mail client (client-msg PLAYER clue guess action done))))
+  (let* ([clue (server-state-clue u)]
+         [guess (server-state-guess u)]
+         [action (server-msg-action s-msg)]
+         [done (server-state-done u)]
+         [action-ok (string=? (server-state-paction u) action)]
+         [has-guess (number? guess)]
+         [data (server-msg-data s-msg)])
+    (cond [(not action-ok)
+           (make-bundle u empty (list client))]
+          [(and (string=? action "c") (not has-guess))
+           (make-bundle u (mail clue guess action done) empty)]
+          [(and (string=? action "c") has-guess)
+           (make-bundle (set-paction "a") (mail clue guess "a" done) empty)]
+          [(and (string=? action "a") (member data '("up" "down")))
+           (make-bundle (set-clue data) (mail data #f "c" done) empty)]
+          [(and (string=? action "a") (string=? data "="))
+           (make-bundle (set-done) (mail "" guess "" #t) empty)]
+          [else (make-bundle u empty (list client))])))
+
+(define (handle-msg-guesser u client s-msg)
+  (define (set-guess interval clue guess)
+    (let ([paction (server-state-paction u)]
+          [clients (server-state-clients u)]
+          [done (server-state-done u)])
+      (server-state interval clue guess paction "c" clients done)))
+  (define (set-gaction-guess)
+    (let ([interval (server-state-interval u)]
+          [clue (server-state-clue u)]
+          [guess (server-state-guess u)]
+          [paction (server-state-paction u)]
+          [clients (server-state-clients u)]
+          [done (server-state-done u)])
+      (server-state interval clue guess paction "g" clients done)))
+  (define (has-clue)
+    (> (string-length (server-state-clue u)) 0))
+  (define (is-done)
+    (server-state-done u))
+  (define (mail clue guess action done)
+    (list (make-mail client
+                     (client-msg GUESSER clue guess action done))))
+  (let* ([action (server-msg-action s-msg)]
+         [interval (server-state-interval u)]
+         [clue (server-state-clue u)]
+         [current-guess (server-state-guess u)]
+         [done (server-state-done u)]
+         [action-ok (string=? (server-state-gaction u) action)])
+    (cond [(not action-ok) (make-bundle u empty (list client))]
+          [(is-done) (make-bundle u (mail "" current-guess "" #t) empty)]
+          [(and (string=? action "g") (not (has-clue)))
+           (let ([guess (guess interval)])
+             (make-bundle (set-guess interval "" guess)
+                          (mail "" guess "c" done) empty))]
+          [(and (string=? action "g") (has-clue))
+           (let* ([n-interval (next-interval interval clue)]
+                  [guess (guess n-interval)])
+             (make-bundle (set-guess n-interval "" guess)
+                          (mail "" guess "c" done) empty))]
+          [(and (string=? action "c") (has-clue))
+           (make-bundle (set-gaction-guess)
+                        (mail clue current-guess "g" done) empty)]
+          [else (make-bundle u (mail clue current-guess action done)
+                             empty)])))
+
+(define (next-interval interval clue)
+  (cond [(not (string? clue))   interval]
+        [(string=? "up" clue)   (bigger interval)]
+        [(string=? "down" clue) (smaller interval)]
+        [else interval]))
+
+(define (single? w)
+  (= (interval-small w) (interval-big w)))
+
+(define (guess w)
+  (quotient (+ (interval-small w) (interval-big w)) 2))
+
+(define (smaller w)
+  (interval (interval-small w) (max (interval-small w) (sub1 (guess w)))))
+
+(define (bigger w)
+  (interval (min (interval-big w) (add1 (guess w))) (interval-big w)))