# HG changeset patch
# User Steve Losh <steve@stevelosh.com>
# Date 1341746094 14400
# Node ID 06c10cd4dd4f722447f1ff30c14708a9a2a341f8
# Parent  c67c0e67ef6a9eb8fe9cb832772b43c8d696f903
basic skeleton

diff -r c67c0e67ef6a -r 06c10cd4dd4f src/caves/core.clj
--- a/src/caves/core.clj	Sat Jul 07 17:58:47 2012 -0400
+++ b/src/caves/core.clj	Sun Jul 08 07:14:54 2012 -0400
@@ -2,13 +2,86 @@
   (:require [lanterna.screen :as s]))
 
 
+; Data Structures -------------------------------------------------------------
+(defrecord UI [kind])
+(defrecord World [])
+(defrecord Game [world uis input])
+
+; Utility Functions -----------------------------------------------------------
+(defn clear-screen [screen]
+  (let [blank (apply str (repeat 80 \space))]
+    (doseq [row (range 24)]
+      (s/put-string screen 0 row blank))))
+
+
+; Input -----------------------------------------------------------------------
+(defmulti process-input
+  (fn [ui input game]
+    (:kind ui)))
+
+(defmethod process-input :start [ui input game]
+  (if (= input :enter)
+    (assoc game :uis [(new UI :win)])
+    (assoc game :uis [(new UI :lose)])))
+
+(defmethod process-input :win [ui input game]
+  (if (= input :escape)
+    (assoc game :uis [])
+    (assoc game :uis [(new UI :start)])))
+
+(defmethod process-input :lose [ui input game]
+  (if (= input :escape)
+    (assoc game :uis [])
+    (assoc game :uis [(new UI :start)])))
+
+(defn get-input [game screen]
+  (assoc game :input (s/get-key-blocking screen)))
+
+
+; Drawing ---------------------------------------------------------------------
+(defmulti draw-ui
+  (fn [ui game screen]
+    (:kind ui)))
+
+(defmethod draw-ui :start [ui game screen]
+  (s/put-string screen 0 0 "Welcome to the Caves of Clojure!")
+  (s/put-string screen 0 1 "Press enter to win, anything else to lose."))
+
+(defmethod draw-ui :win [ui game screen]
+  (s/put-string screen 0 0 "Congratulations, you win!")
+  (s/put-string screen 0 1 "Press escape to exit, anything else to restart."))
+
+(defmethod draw-ui :lose [ui game screen]
+  (s/put-string screen 0 0 "Sorry, better luck next time.")
+  (s/put-string screen 0 1 "Press escape to exit, anything else to go."))
+
+(defn draw-game [game screen]
+  (clear-screen screen)
+  (doseq [ui (:uis game)]
+    (draw-ui ui game screen))
+  (s/redraw screen))
+
+
+; Main ------------------------------------------------------------------------
+(defn run-game [game screen]
+  (loop [{:keys [input uis] :as game} game]
+    (when-not (empty? uis)
+      (draw-game game screen)
+      (if (nil? input)
+        (recur (get-input game screen))
+        (recur (process-input (last uis) input (dissoc game :input)))))))
+
+(defn new-game []
+  (new Game
+       (new World)
+       [(new UI :start)]
+       nil))
+
 (defn main [screen-type]
-  (let [screen (s/get-screen screen-type)]
-    (s/in-screen screen
-                 (s/put-string screen 0 0 "Welcome to the Caves of Clojure!")
-                 (s/put-string screen 0 1 "Press any key to exit...")
-                 (s/redraw screen)
-                 (s/get-key-blocking screen))))
+  (future
+    (let [screen (s/get-screen screen-type)]
+      (s/in-screen screen
+                   (run-game (new-game) screen)))))
 
 
 (defn -main [& args]
@@ -19,5 +92,6 @@
                       :else           :auto)]
     (main screen-type)))
 
+
 (comment
   (main :swing))