From 048868fc4be9c6b033d711cc78b55d35765d1960 Mon Sep 17 00:00:00 2001
From: Ben Harris <ben@tilde.team>
Date: Sun, 4 Dec 2022 22:04:48 -0500
Subject: [PATCH] couldn't get it to work with Utf8JsonReader

pulled out the trusty newtonsoft.json
---
 AOC.Test/Test2015.cs   |  2 +-
 AOC2015/AOC2015.csproj |  4 ++++
 AOC2015/Day12.cs       | 48 +++++++++++++++++-------------------------
 3 files changed, 24 insertions(+), 30 deletions(-)

diff --git a/AOC.Test/Test2015.cs b/AOC.Test/Test2015.cs
index 33ebb4c..672ae51 100644
--- a/AOC.Test/Test2015.cs
+++ b/AOC.Test/Test2015.cs
@@ -17,7 +17,7 @@ public class Test2015
     [DataRow(typeof(Day09), "117", "909")]
     [DataRow(typeof(Day10), "492982", "6989950")]
     [DataRow(typeof(Day11), "hepxxyzz", "heqaabcc")]
-    [DataRow(typeof(Day12), "111754", "")]
+    [DataRow(typeof(Day12), "111754", "65402")]
     public void CheckAllDays(Type dayType, string part1, string part2)
     {
         Common.CheckDay(dayType, part1, part2);
diff --git a/AOC2015/AOC2015.csproj b/AOC2015/AOC2015.csproj
index c50dad5..2ab4738 100644
--- a/AOC2015/AOC2015.csproj
+++ b/AOC2015/AOC2015.csproj
@@ -26,4 +26,8 @@
         <ProjectReference Include="..\AOC.Common\AOC.Common.csproj" />
     </ItemGroup>
 
+    <ItemGroup>
+      <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+    </ItemGroup>
+
 </Project>
diff --git a/AOC2015/Day12.cs b/AOC2015/Day12.cs
index 62d9394..a4061fa 100644
--- a/AOC2015/Day12.cs
+++ b/AOC2015/Day12.cs
@@ -1,4 +1,5 @@
-using System.Text.Json;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
 
 namespace AOC2015;
 
@@ -10,7 +11,7 @@ public sealed partial class Day12 : Day
     public Day12() : base(2015, 12, "JSAbacusFramework.io")
     {
     }
-    
+
     [GeneratedRegex(@"-?\d+")]
     private static partial Regex Digits();
 
@@ -19,31 +20,20 @@ public sealed partial class Day12 : Day
 
     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;
+        dynamic j = JsonConvert.DeserializeObject(Input.First())!;
+        return GetSum(j, "red");
     }
-}
+
+    private long GetSum(JObject o, string? avoid = null)
+    {
+        var shouldAvoid = o.Properties()
+            .Select(a => a.Value).OfType<JValue>()
+            .Select(v => v.Value).Contains(avoid);
+
+        return shouldAvoid ? 0 : o.Properties().Sum((dynamic a) => (long)GetSum(a.Value, avoid));
+    }
+
+    private long GetSum(JArray arr, string avoid) => arr.Sum((dynamic a) => (long)GetSum(a, avoid));
+
+    private long GetSum(JValue val, string avoid) => val.Type == JTokenType.Integer ? (long)(val.Value ?? 0L) : 0;
+}
\ No newline at end of file