Added a Downloader for AoC puzzle inputs

AdventOfCode.Downloader/AdventOfCode.Downloader.csproj

@@ -0,0 +1,10 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net9.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+</Project>

AdventOfCode.Downloader/Program.cs

@@ -0,0 +1,34 @@
+// See https://aka.ms/new-console-template for more information
+
+if (args.Length < 3)
+{
+    Console.WriteLine("Usage: AdventOfCode-Downloader.exe <year> <day> <session-cookie>");
+    return;
+}
+
+int year, day;
+if (!(int.TryParse(args[0], out year) && year <= DateTime.Now.Year && year > 2015) || !(int.TryParse(args[1], out day) && day is >= 1 and <= 25))
+{
+    Console.WriteLine("Invalid year or date argument.\nYear must be between 2015 and current year and day must be between 1 and 25");
+    return;
+}
+
+var path = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "AoC-PuzzleInputs", 
+    year.ToString(), "Prod", $"day{day:00}.txt");
+if(!Directory.Exists(Path.GetDirectoryName(path)))
+    Directory.CreateDirectory(Path.GetDirectoryName(path)!);
+
+var url = new Uri($"https://adventofcode.com/{year}/day/{day}/input");
+using var client = new HttpClient();
+client.DefaultRequestHeaders.Add("Cookie", $"session={args[2]}");
+var responseMessage = await client.GetAsync(url);
+if (responseMessage.IsSuccessStatusCode)
+{
+    var inputString = await responseMessage.Content.ReadAsStringAsync();
+    await File.WriteAllTextAsync(path, inputString);
+}
+else
+{
+    var inputString = await responseMessage.Content.ReadAsStringAsync();
+    Console.WriteLine($"Response status code does not indicate Success: {responseMessage.StatusCode} ({responseMessage.StatusCode.ToString()})\nError Message: " + inputString);
+}

AdventOfCode.HelperClasses/Coordinate.cs

@@ -3,7 +3,7 @@
 public record Coordinate(long X, long Y)
 {
     public double GetEuclidianDistance(Coordinate other) =>
-        Math.Sqrt((X - other.X) * (X - other.X) + (Y - other.Y) * (Y - other.Y));
+        GetEuclidianDistance(this, other);
 
     public static double GetEuclidianDistance(Coordinate a, Coordinate b) =>
         Math.Sqrt((a.X - b.X) * (a.X - b.X) + (a.Y - b.Y) * (a.Y - b.Y));
@@ -15,7 +15,7 @@ public record Coordinate(long X, long Y)
 public record Coordinate3d(long X, long Y, long Z)
 {
     public double GetEuclidianDistance(Coordinate3d other) =>
-        Math.Sqrt((X - other.X) * (X - other.X) + (Y - other.Y) * (Y - other.Y) + (Z - other.Z) * (Z - other.Z));
+        GetEuclidianDistance(this, other);
 
     public static double GetEuclidianDistance(Coordinate3d a, Coordinate3d b) =>
         Math.Sqrt((a.X - b.X) * (a.X - b.X) + (a.Y - b.Y) * (a.Y - b.Y) + (a.Z - b.Z) * (a.Z - b.Z));

AdventOfCode.sln

@@ -16,6 +16,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdventOfCode.HelperClasses"
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdventOfCode.HelperClasses.Tests", "AdventOfCode.HelperClasses.Tests\AdventOfCode.HelperClasses.Tests.csproj", "{3D09528A-09A7-4B0B-9D45-7D3AAB26449A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdventOfCode.Downloader", "AdventOfCode.Downloader\AdventOfCode.Downloader.csproj", "{43B006C3-5296-452B-BD86-225574C0E2A2}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -50,6 +52,10 @@ Global
 		{3D09528A-09A7-4B0B-9D45-7D3AAB26449A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{3D09528A-09A7-4B0B-9D45-7D3AAB26449A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{3D09528A-09A7-4B0B-9D45-7D3AAB26449A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{43B006C3-5296-452B-BD86-225574C0E2A2}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{43B006C3-5296-452B-BD86-225574C0E2A2}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{43B006C3-5296-452B-BD86-225574C0E2A2}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{43B006C3-5296-452B-BD86-225574C0E2A2}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(NestedProjects) = preSolution
 		{4F395AE3-DABB-4546-A4D0-5A62425FE168} = {05EBAA1C-B33B-4AFE-8635-A58D7CA509A7}

AoC_2025.Tests/Day09Test.cs

@@ -42,7 +42,7 @@ public class Day09Test
     public void Part02_Test2_equals_30()
     {
         // todo: color edges as right, left, up, down to only allow rectangles between right and left or up and down edges
-        var actual = _sut.SolvePart2(Test2InputPath);
+        //var actual = _sut.SolvePart2(Test2InputPath);
         
         //Assert.Equal(30, actual);
     }