From 21b7041172cd2c7c463e7b884dc01d5b47048b47 Mon Sep 17 00:00:00 2001
From: Christopher Arndt <chris@chrisarndt.de>
Date: Mon, 4 Dec 2023 11:36:45 +0100
Subject: [PATCH] Refactor solution day 04 part 1

Signed-off-by: Christopher Arndt <chris@chrisarndt.de>
---
 day_04/solution_04a.nim | 40 ++++++++++++++++++++++++++++------------
 1 file changed, 28 insertions(+), 12 deletions(-)

diff --git a/day_04/solution_04a.nim b/day_04/solution_04a.nim
index 3894ee9..c97ab51 100644
--- a/day_04/solution_04a.nim
+++ b/day_04/solution_04a.nim
@@ -4,19 +4,35 @@ var result = 0
 var fn = if paramCount() > 0: paramStr(1) else: "input_04.txt"
 var lines = readFile(fn).strip.splitLines
 
-for line in lines:
-    var card: int
-    let cardspec = line.split(":", 1)
-    if scanf(cardspec[0].strip, "Card$s$i", card):
-        let play = cardspec[1].split("|")[0].strip.splitWhitespace().mapIt(it.strip).mapIt(it.parseInt).mapIt(it.int8).toSet
-        let jackpot = cardspec[1].split("|")[1].strip.splitWhitespace().mapIt(it.strip).mapIt(it.parseInt).mapIt(it.int8).toSet
-        #echo &"Card {card}: {left}, {right} => {left * right}"
-        let wins = (play * jackpot).len
-        if wins == 1:
-            result += 1
-        elif wins > 1:
-            result += 2 ^ (wins - 1)
+# ASSUMPTION: lottery numbers are < 128
+type
+    Card = ref object
+        play, pot: set[int8]
+var cards: seq[Card]
 
+proc points(card: Card): int =
+    let matches = (card.play * card.pot).len
+    if matches == 1:
+        result = 1
+    elif matches > 1:
+        result = 2 ^ (matches - 1)
+    else:
+        result = 0
+
+
+for line in lines:
+    var cardno: int
+    let cardspec = line.split(":", 1)
+
+    if scanf(cardspec[0].strip, "Card$s$i", cardno):
+        let card = new Card
+        card.play = cardspec[1].split("|")[0].strip.splitWhitespace().mapIt(it.strip).mapIt(it.parseInt).mapIt(it.int8).toSet
+        card.pot = cardspec[1].split("|")[1].strip.splitWhitespace().mapIt(it.strip).mapIt(it.parseInt).mapIt(it.int8).toSet
+        echo &"Card {cardno}: {card.play}, {card.pot} => {card.points}"
+        cards.add(card)
+        result += card.points
+
+echo &"Cards processed: {cards.len}"
 echo &"Result: {result}"
 
 case fn: