From 681bb881df884c54fb2422053feacfed2ef09324 Mon Sep 17 00:00:00 2001
From: Oscar Najera <hi@oscarnajera.com>
Date: Fri, 16 Dec 2022 16:48:10 +0100
Subject: draw again and solve example

---
 AoC2022/14/solver.el | 46 +++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 39 insertions(+), 7 deletions(-)

(limited to 'AoC2022/14/solver.el')

diff --git a/AoC2022/14/solver.el b/AoC2022/14/solver.el
index bd0464f..a5cc896 100644
--- a/AoC2022/14/solver.el
+++ b/AoC2022/14/solver.el
@@ -14,6 +14,7 @@
 ;;; Code:
 
 (require 'seq)
+(require 'subr-x)
 
 (defun solver-bounds (str-or-buffer)
   (with-temp-buffer
@@ -36,7 +37,7 @@
                                    (x-len (1+ (- (car bounds) (cadr bounds))))
                                    (y-len (1+ (elt bounds 2)))
                                    (stride (* 8 (1+ (/ x-len 8))))
-                                   (grid (make-bool-vector (* stride y-len) nil))))
+                                   (grid (make-vector (* stride y-len) 0))))
                     (:copier nil))
   "Represents a snapshot of game of life."
   bounds
@@ -59,9 +60,9 @@
         (unless (null startx)
           (if (= startx fx)
               (cl-loop for y from (min starty fy) to (max starty fy)
-                       do (aset (grid-grid grid) (solver-point startx y grid) t))
+                       do (aset (grid-grid grid) (solver-point startx y grid) 1))
             (cl-loop for x from (min startx fx) to (max startx fx)
-                     do (aset (grid-grid grid) (solver-point x starty grid) t))))
+                     do (aset (grid-grid grid) (solver-point x starty grid) 1))))
         (setq startx fx
               starty fy)))))
 
@@ -96,6 +97,19 @@
                   :background "#000000"
                   )))
 
+(defun solver-draw-grid (grid)
+  (let ((stride (grid-stride grid)))
+    (seq-do-indexed
+     (lambda (elt idx)
+       (let ((slot (mod idx stride)))
+         (when (= 0 slot)
+           (insert "\n"))
+         (insert (cl-case elt
+                   (0 ".")
+                   (1 "#")
+                   (2 "o")))))
+     (grid-grid grid))))
+
 
 (solver-walls "498,4 -> 498,6 -> 496,6
 503,4 -> 502,4 -> 502,9 -> 494,9"
@@ -106,8 +120,26 @@
 (let* ((instr   "498,4 -> 498,6 -> 496,6
 503,4 -> 502,4 -> 502,9 -> 494,9")
        (bounds (solver-bounds instr))
-       (grid (solver-grid-create bounds)))
+       (grid (solver-grid-create bounds))
+       (drops 0))
   (solver-walls instr grid)
-  (thread-first
-    (solver-draw-wall grid)
-    (insert-image)))
+  ;; (thread-first
+  ;;   (solver-draw-wall grid)
+  ;;   (insert-image))
+
+  grid
+  ;; sim
+  (named-let loop ((x 500)
+                   (y 0))
+
+    (ignore-error 'wrong-type-argument ;; went out of grid
+      (cond
+       ((= 0 (aref (grid-grid grid) (solver-point x (1+ y) grid))) (loop x (1+ y))) ;; check next
+       ((= 0 (aref (grid-grid grid) (solver-point (1- x) (1+ y) grid))) (loop (1- x) (1+ y))) ;; check left
+       ((= 0 (aref (grid-grid grid) (solver-point (1+ x) (1+ y) grid))) (loop (1+ x) (1+ y))) ;; check right
+       (t (aset (grid-grid grid) (solver-point x y grid) 2)
+          (cl-incf drops)
+          (loop 500 0)))))
+  (solver-draw-grid grid)
+  drops
+  )
-- 
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