From 90794553552774b3d4bf75b8bd6a8f8b8e18ec9e Mon Sep 17 00:00:00 2001
From: Oscar Najera <hi@oscarnajera.com>
Date: Wed, 11 Jan 2023 21:09:56 +0100
Subject: cleaning up

---
 AoC2022/19/solver.lisp | 60 ++++++++++++++------------------------------------
 1 file changed, 16 insertions(+), 44 deletions(-)

diff --git a/AoC2022/19/solver.lisp b/AoC2022/19/solver.lisp
index 37b1e74..083a093 100644
--- a/AoC2022/19/solver.lisp
+++ b/AoC2022/19/solver.lisp
@@ -29,39 +29,6 @@
 (defun bot-requirements (type recipes)
   (fset:lookup recipes type))
 
-(defun plist-merge (func p1 p2 &optional default)
-  "Merge 2 flat plists P1 & P2 by FUNC. Use DEFAULT when value is missing on one list."
-  (flet ((keys (plist) (loop for key in plist by #'cddr collect key)))
-    (loop for key in (union (keys p1) (keys p2))
-          nconc (list key (funcall func (getf p1 key default) (getf p2 key default))))))
-
-(defun max-costs (blueprint)
-  (reduce
-   (lambda (acc item)
-     (plist-merge #'max acc item 0))
-   (mapcar #'cdr blueprint)))
-
-(defun can-build (recipes available-materials)
-  (mapcan (lambda (bot-recipes)
-            (when (can-build-robot-p (cdr bot-recipes) available-materials)
-              (list (car bot-recipes))))
-          recipes))
-
-(defun should-build (blueprints robots)
-  (let ((max-cost (max-costs blueprints)))
-    (loop for (type amount) on robots by #'cddr
-          when (or (eq type :geode)
-                   (<= amount (getf max-cost type 0)))
-            collect type)))
-
-(defun try! (build-next robots resources blueprints)
-  (let ((req (bot-requirements build-next blueprints)))
-    (if (can-build-robot-p req resources)
-      (values
-       (consume req resources)
-       (fset:with robots build-next))
-      (values resources robots))))
-
 (defun next-step (build-next robots resources blueprints time-left)
   (if (zerop time-left)
       ;; (list robots resources)
@@ -69,19 +36,26 @@
       ;; resources
       (let ((req (bot-requirements build-next blueprints)))
         (if (can-build-robot-p req resources)
-            (reduce (lambda (max next)
-                      (max max
-                           (next-step next
-                                      (fset:with robots build-next)
-                                      (material-collect robots (consume req resources))
-                                      blueprints (1- time-left))))
-                    '(:geode :obsidian :clay :ore)
-                    :initial-value 0)
+            (let ((new-robots (fset:with robots build-next))
+                  (resources-left (consume req resources)))
+              (probe new-robots
+                     (material-collect robots resources-left)
+                     blueprints (1- time-left)))
             (next-step build-next
                        robots
                        (material-collect robots resources)
                        blueprints (1- time-left))))))
 
+(defun probe (robots resources blueprints time-left)
+  (reduce (lambda (max next)
+            (max max
+                 (next-step next
+                            robots
+                            resources
+                            blueprints time-left)))
+          '(:geode :obsidian :clay :ore)
+          :initial-value 0))
+
 (defun start-resources ()
   ;; (list :ore 0 :clay 0 :obsidian 0 :geode 0)
   (fset:empty-bag))
@@ -103,7 +77,5 @@
       (bots (start-bots))
       ;; (bots '(:geode 1 :ore 8 :clay 20))
       (time-left 24))
-
-
-  (next-step :clay bots materials blueprints time-left)
+      (probe bots materials blueprints time-left)
   )
-- 
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