refactor: Change Input loading to class instead of reader

AdventOfCode2025/Day1.cs

@@ -1,15 +1,17 @@
+using AdventOfCode2025.Inputs;
+
 namespace AdventOfCode2025;
 
 public sealed class Day1 : Solution
 {
+    private readonly Input input = new(1);
     private const int MaxArrow = 100;
 
     public override string SolvePart1()
     {
         var arrow = 50;
         var zeroCounter = 0;
-        IEnumerable<string> lines = InputReader.ReadLines(1);
+        foreach (var line in input.Lines)
-        foreach (var line in lines)
         {
             var number = int.Parse(line[1..]);
             arrow = line.First() switch
@@ -33,9 +35,8 @@ public sealed class Day1 : Solution
     {
         var arrow = 50;
         var zeroCounter = 0;
-        IEnumerable<string> lines = InputReader.ReadLines(1);
 
-        foreach (var line in lines)
+        foreach (var line in input.Lines)
         {
             var number = int.Parse(line[1..]);
             zeroCounter += number / MaxArrow;

AdventOfCode2025/Day2.cs

@@ -1,11 +1,13 @@
+using AdventOfCode2025.Inputs;
+
 namespace AdventOfCode2025;
 
 public class Day2 : Solution
 {
+    private readonly Input input = new(2);
     public override string SolvePart1()
     {
-        return InputReader
+        return input.Lines
-            .ReadLines(2)
             .SelectMany(ToRanges)
             .Select(ToLimit)
             .SelectMany(GetIds)
@@ -16,8 +18,7 @@ public class Day2 : Solution
 
     public override string SolvePart2()
     {
-        return InputReader
+        return input.Lines
-            .ReadLines(2)
             .SelectMany(ToRanges)
             .Select(ToLimit)
             .SelectMany(GetIds)

AdventOfCode2025/Day3.cs

@@ -1,31 +1,23 @@
+using AdventOfCode2025.Inputs;
+
 namespace AdventOfCode2025;
 
 public class Day3 : Solution
 {
-    public override string SolvePart1() =>
+    private readonly Input input = new(3);
-        InputReader
-            .ReadLines(3)
-            .Select(line => line.Select(c => c - '0').ToArray())
-            .Select(bank => GetLargestJolts(bank))
-            .Sum()
-            .ToString();
 
-    public override string SolvePart2() =>
+    public override string SolvePart1() => input.GetLines(x => ParseLine(x, 2)).Sum().ToString();
-        InputReader
+
-            .ReadLines(3)
+    public override string SolvePart2() => input.GetLines(x => ParseLine(x, 12)).Sum().ToString();
-            .Select(line => line.Select(c => c - '0').ToArray())
-            .Select(bank => GetLargestJolts(bank, 12))
-            .Sum()
-            .ToString();
 
     private static long GetLargestJolts(int[] bank, int numberOfJolts = 2)
     {
         var total = 0L;
         var from = 0;
-        var to = bank.Length - numberOfJolts;
+        int to = bank.Length - numberOfJolts;
-        for (var i = numberOfJolts - 1; i >= 0; i--)
+        for (int i = numberOfJolts - 1; i >= 0; i--)
         {
-            var maxIndexI = GetIndexOfMax(bank, from, to);
+            int maxIndexI = GetIndexOfMax(bank, from, to);
             total += bank[maxIndexI] * (long)Math.Pow(10, i);
             from = maxIndexI + 1;
             to = bank.Length - i;
@@ -44,13 +36,13 @@ public class Day3 : Solution
 
     private static int GetIndexOfMax(int[] array, int from, int to)
     {
-        var maxIndex = from;
+        int maxIndex = from;
         if (from + 1 > to)
         {
             return maxIndex;
         }
 
-        for (var i = from + 1; i <= to; i++)
+        for (int i = from + 1; i <= to; i++)
         {
             if (array[i] > array[maxIndex])
             {
@@ -60,4 +52,10 @@ public class Day3 : Solution
 
         return maxIndex;
     }
+
+    private static long ParseLine(string line, int numberOfJolts)
+    {
+        int[] bank = line.Select(c => c - '0').ToArray();
+        return GetLargestJolts(bank, numberOfJolts);
+    }
 }

AdventOfCode2025/Day4.cs

@@ -1,13 +1,16 @@
+using AdventOfCode2025.Inputs;
+
 namespace AdventOfCode2025;
 
 public class Day4 : Solution
 {
+    private readonly Input input = new(4);
     private const char NoneChar = '.';
     private const char PaperChar = '@';
 
     public override string SolvePart1()
     {
-        var grid = PaddingField(InputReader.ReadLines(4))
+        var grid = PaddingField(input.Lines)
             .Select(line => line.ToCharArray())
             .ToArray();
 
@@ -16,7 +19,7 @@ public class Day4 : Solution
 
     public override string SolvePart2()
     {
-        var grid = PaddingField(InputReader.ReadLines(4))
+        var grid = PaddingField(input.Lines)
             .Select(line => line.ToCharArray())
             .ToArray();
         List<(int, int)> paperCanBeRemoved;

AdventOfCode2025/Day5.cs

@@ -1,10 +1,13 @@
+using AdventOfCode2025.Inputs;
+
 namespace AdventOfCode2025;
 
 public class Day5 : Solution
 {
+    private readonly Input input = new(5);
     public override string SolvePart1()
     {
-        List<string> lines = InputReader.ReadLines(5).ToList();
+        List<string> lines = input.Lines.ToList();
         List<Range> freshRanges = GetFreshRanges(lines);
         int freshIngredients = lines[(freshRanges.Count + 1)..].Select(long.Parse).Count(id => IsFresh(id, freshRanges));
         return freshIngredients.ToString();
@@ -12,7 +15,7 @@ public class Day5 : Solution
 
     public override string SolvePart2()
     {
-        List<string> lines = InputReader.ReadLines(5).ToList();
+        List<string> lines = input.Lines.ToList();
         List<Range> ranges = GetFreshRanges(lines).OrderBy(x => x.From).ThenBy(x => x.To).ToList();
 
         var merged = new List<Range>();

AdventOfCode2025/InputReader.cs

@@ -1,7 +0,0 @@
-namespace AdventOfCode2025;
-
-public static class InputReader
-{
-    private const string BasePath = "../../../Inputs/";
-    public static IEnumerable<string> ReadLines(int day, int partNumber = 1) => File.ReadAllLines($"{BasePath}Day{day}_{partNumber}.txt");
-}

AdventOfCode2025/Inputs/Input.cs

@@ -0,0 +1,16 @@
+namespace AdventOfCode2025.Inputs;
+
+public sealed record Input(int Day, int PartNumber = 1)
+{
+    private const string BasePath = "../../../Inputs/";
+    public string ToPath()  => BasePath + $"Day{Day}_{PartNumber}.txt";
+}
+
+public static class InputExtensions
+{
+    extension(Input input)
+    {
+        public IEnumerable<string> Lines => File.ReadAllLines(input.ToPath());
+        public IEnumerable<T> GetLines<T>(Func<string, T> parser) => input.Lines.Select(parser);
+    }
+}