From 0caf534d831ba739f933f3b38f246864c86735e2 Mon Sep 17 00:00:00 2001
From: Ben Harris <ben@tilde.team>
Date: Sun, 4 Dec 2022 15:05:16 -0500
Subject: [PATCH] gonna break the unit tests...

2015 day 12 p1 works but part 2 is over counting
---
 AOC.Test/Test2015.cs |  1 +
 AOC2015/Day12.cs     | 40 +++++++++++++++++++++++++++++++++++++---
 2 files changed, 38 insertions(+), 3 deletions(-)

diff --git a/AOC.Test/Test2015.cs b/AOC.Test/Test2015.cs
index b6700cf..33ebb4c 100644
--- a/AOC.Test/Test2015.cs
+++ b/AOC.Test/Test2015.cs
@@ -17,6 +17,7 @@ public class Test2015
     [DataRow(typeof(Day09), "117", "909")]
     [DataRow(typeof(Day10), "492982", "6989950")]
     [DataRow(typeof(Day11), "hepxxyzz", "heqaabcc")]
+    [DataRow(typeof(Day12), "111754", "")]
     public void CheckAllDays(Type dayType, string part1, string part2)
     {
         Common.CheckDay(dayType, part1, part2);
diff --git a/AOC2015/Day12.cs b/AOC2015/Day12.cs
index 8e848b5..62d9394 100644
--- a/AOC2015/Day12.cs
+++ b/AOC2015/Day12.cs
@@ -1,15 +1,49 @@
+using System.Text.Json;
+
 namespace AOC2015;
 
 /// <summary>
 /// Day 12: <a href="https://adventofcode.com/2015/day/12"/>
 /// </summary>
-public sealed class Day12 : Day
+public sealed partial class Day12 : Day
 {
     public Day12() : base(2015, 12, "JSAbacusFramework.io")
     {
     }
+    
+    [GeneratedRegex(@"-?\d+")]
+    private static partial Regex Digits();
 
-    public override object Part1() => "";
+    public override object Part1() =>
+        Digits().Matches(Input.First()).Sum(n => int.Parse(n.Value));
 
-    public override object Part2() => "";
+    public override object Part2()
+    {
+        var reader = new Utf8JsonReader(File.ReadAllBytes(FileName));
+        var sum = 0;
+        bool redObject = false, insideObject = false;
+        
+        while (reader.Read())
+        {
+            switch (reader.TokenType)
+            {
+                case JsonTokenType.StartObject:
+                    insideObject = true;
+                    break;
+                case JsonTokenType.EndObject:
+                    insideObject = false;
+                    redObject = false;
+                    break;
+                case JsonTokenType.String:
+                    if (insideObject && reader.GetString()! == "red")
+                        redObject = true;
+                    break;
+                case JsonTokenType.Number:
+                    if (!redObject) sum += reader.GetInt32();
+                    break;
+            }
+        }
+
+        return sum;
+    }
 }