feat: solved day 15 part 2

15/WarehouseWoes/Program.cs

@@ -1,5 +1,6 @@
 using System.Diagnostics;
-using System.Text;
+
+using WarehouseWoes;
 
 if (args.Length is 0)
 {
@@ -19,208 +20,13 @@ var input = await File.ReadAllTextAsync(args[0]);
 var stopwatch = new Stopwatch();
 stopwatch.Start();
 
-var (map, directions) = PuzzleParser.Parse(input);
+var (parsedMap, directions) = PuzzleParser.Parse(input);
+
+var map = isPart2 
+  ? parsedMap.Scale() 
+  : parsedMap;
+
 var result = map.MoveRobot(directions).CalculateTotalBoxGpsCoordinates();
 
 stopwatch.Stop();
-Console.WriteLine($"The sum of all boxes' GPS coordinates is {result}. ({stopwatch.ElapsedMilliseconds}ms)");
-
-static class PuzzleParser
-{
-  public static (WarehouseMap Map, List<Direction> Directions) Parse(string input)
-  {
-    var inputParts = input.Split($"{Environment.NewLine}{Environment.NewLine}");
-    
-    var map = WarehouseMap.From(inputParts[0].Split(Environment.NewLine));
-    
-    var directions = inputParts[1]
-      .Where(character =>
-      {
-        var str = character.ToString();
-        return str != "\r" && str != "\n" && str != "\r\n";
-      })
-      .Select(Direction.From)
-      .ToList();
-    
-    return (map, directions);
-  }
-}
-
-class WarehouseMap
-{
-  private const char Robot = '@';
-  private const char Wall = '#';
-  private const char Box = 'O';
-  private const char Empty = '.';
-  
-  public readonly Dictionary<Position, char> Positions;
-  
-  private WarehouseMap(Dictionary<Position, char> positions)
-  {
-    Positions = positions;
-  }
-
-  public static WarehouseMap From(string[] input)
-  {
-    var positions = new Dictionary<Position, char>();
-    
-    for (var y = 0; y < input.Length; y++)
-    {
-      for (var x = 0; x < input[0].Length; x++)
-      {
-        positions.Add(new(x, y), input[y][x]);
-      }
-    }
-
-    return new(positions);
-  }
-
-  public WarehouseMap MoveRobot(List<Direction> directions)
-  {
-    var positions = Positions.ToDictionary();
-    
-    foreach (var direction in directions)
-    {
-      var robotPosition = positions.First(kvp => kvp.Value is Robot).Key;
-      var nextPosition = robotPosition.GetNextPosition(direction);
-      var hasNextPosition = positions.TryGetValue(nextPosition, out var nextPositionValue);
-
-      if (hasNextPosition is false)
-      {
-        continue;
-      }
-      
-      switch (nextPositionValue)
-      {
-        case Wall:
-          continue;
-        case Empty:
-          positions[robotPosition] = Empty;
-          positions[nextPosition] = Robot;
-          continue;
-        case Box when CanPushBox(nextPosition, direction, positions):
-          positions = PushBox(nextPosition, direction, positions);
-          positions[robotPosition] = Empty;
-          positions[nextPosition] = Robot;
-          break;
-      }
-    }
-    
-    return new(positions);
-  }
-
-  public int CalculateTotalBoxGpsCoordinates()
-  {
-    var boxes = Positions.Where(kvp => kvp.Value is Box).ToList();
-    return boxes.Select(kvp => kvp.Key).Sum(p => p.GpsCoordinate);
-  }
-
-  public override string ToString()
-  {
-    var maxX = Positions.Select(kvp => kvp.Key).Max(p => p.X);
-    var maxY = Positions.Select(kvp => kvp.Key).Max(p => p.Y);
-
-    var map = new StringBuilder();
-
-    for (var y = 0; y <= maxY; y++)
-    {
-      var row = new StringBuilder();
-      
-      for (var x = 0; x <= maxX; x++)
-      {
-        var value = Positions[new(x, y)];
-        row.Append(value);
-      }
-
-      map.AppendLine(row.ToString());
-    }
-
-    return map.ToString();
-  }
-
-  private static bool CanPushBox(Position boxPosition, Direction direction, Dictionary<Position, char> positions)
-  {
-    while (true)
-    {
-      var nextPosition = boxPosition.GetNextPosition(direction);
-      var hasNextPosition = positions.TryGetValue(nextPosition, out var nextPositionValue);
-
-      if (hasNextPosition is false)
-      {
-        return false;
-      }
-      
-      switch (nextPositionValue)
-      {
-        case Box:
-          boxPosition = nextPosition;
-          continue;
-        case Empty:
-          return true;
-        default:
-          return false;
-      }
-    }
-  }
-
-  private static Dictionary<Position, Char> PushBox(Position boxPosition, Direction direction, Dictionary<Position, char> currentPositions)
-  {
-    var positions = currentPositions.ToDictionary();
-    
-    while (true)
-    {
-      var nextPosition = boxPosition.GetNextPosition(direction);
-      var hasNextPosition = positions.TryGetValue(nextPosition, out var nextPositionValue);
-
-      if (hasNextPosition is false)
-      {
-        return positions;
-      }
-
-      if (nextPositionValue is Box)
-      {
-        boxPosition = nextPosition;
-        continue;
-      }
-      
-      positions[nextPosition] = Box;
-
-      return positions;
-    }
-  }
-}
-
-record Position(int X, int Y)
-{
-  public int GpsCoordinate => (100 * Y) + X;
-  
-  public Position GetNextPosition(Direction direction)
-  {
-    return new(X + direction.Xd, Y + direction.Yd);
-  }
-}
-
-record Direction(int Xd, int Yd)
-{
-  private const char UpCharacter = '^';
-  private const char RightCharacter = '>';
-  private const char DownCharacter = 'v';
-  private const char LeftCharacter = '<';
-
-  private static readonly Direction Up = new(0, -1);
-  private static readonly Direction Down = new(0, 1);
-  private static readonly Direction Left = new(-1, 0);
-  private static readonly Direction Right = new(1, 0);
-
-  public static Direction From(char character)
-  {
-    return character switch
-    {
-      UpCharacter => Up,
-      RightCharacter => Right,
-      DownCharacter => Down,
-      LeftCharacter => Left,
-      _ => throw new ArgumentException(@$"{nameof(character)} is not a valid: {character}"),
-    };
-  }
-}
+Console.WriteLine($"The sum of all boxes' GPS coordinates is {result}. ({stopwatch.ElapsedMilliseconds}ms)");