From 24c171c790728e5726e2d0a9f120361840b2e903 Mon Sep 17 00:00:00 2001
From: Stevan Freeborn <65925598+StevanFreeborn@users.noreply.github.com>
Date: Wed, 20 Dec 2023 20:39:14 -0600
Subject: [PATCH] feat: solve part 1

---
 14/ParabolicReflectorDish.Tests/DishTests.cs |  96 ++++++++++++++++
 14/ParabolicReflectorDish.Tests/UnitTest1.cs |  10 --
 14/ParabolicReflectorDish/Program.cs         | 109 ++++++++++++++++++-
 3 files changed, 203 insertions(+), 12 deletions(-)
 create mode 100644 14/ParabolicReflectorDish.Tests/DishTests.cs
 delete mode 100644 14/ParabolicReflectorDish.Tests/UnitTest1.cs

diff --git a/14/ParabolicReflectorDish.Tests/DishTests.cs b/14/ParabolicReflectorDish.Tests/DishTests.cs
new file mode 100644
index 0000000..db823bc
--- /dev/null
+++ b/14/ParabolicReflectorDish.Tests/DishTests.cs
@@ -0,0 +1,96 @@
+namespace ParabolicReflectorDish.Tests;
+
+public class DishTests
+{
+  [Theory]
+  [MemberData(nameof(TestData.ParseTestData), MemberType = typeof(TestData))]
+  public void Parse_GivenInput_ItShouldReturnDishInstance(string[] input, Dish expected)
+  {
+    var result = Dish.Parse(input);
+    result.Should().BeEquivalentTo(expected);
+  }
+
+  [Theory]
+  [MemberData(nameof(TestData.CalculateTotalLoadTestData), MemberType = typeof(TestData))]
+  public void CalculateTotalLoad_WhenCalled_ItShouldReturnExpectedLoad(Dish dish, long expected)
+  {
+    var result = dish.CalculateTotalLoad();
+    result.Should().Be(expected);
+  }
+
+  public static class TestData
+  {
+    private static readonly Dish TestDish = new(
+      [
+        ['O', 'O', 'O', 'O', '.', '#', '.', 'O', '.', '.'],
+        ['O', 'O', '.', '.', '#', '.', '.', '.', '.', '#'],
+        ['O', 'O', '.', '.', 'O', '#', '#', '.', '.', 'O'],
+        ['O', '.', '.', '#', '.', 'O', 'O', '.', '.', '.'],
+        ['.', '.', '.', '.', '.', '.', '.', '.', '#', '.'],
+        ['.', '.', '#', '.', '.', '.', '.', '#', '.', '#'],
+        ['.', '.', 'O', '.', '.', '#', '.', 'O', '.', 'O'],
+        ['.', '.', 'O', '.', '.', '.', '.', '.', '.', '.'],
+        ['#', '.', '.', '.', '.', '#', '#', '#', '.', '.'],
+        ['#', '.', '.', '.', '.', '#', '.', '.', '.', '.'],
+      ]
+    );
+
+    public static IEnumerable<object[]> CalculateTotalLoadTestData =>
+      new List<object[]>
+      {
+        new object[]
+        {
+          new Dish(
+            [
+              ['O', 'O', 'O', 'O', '.', '#', '.', 'O', '.', '.'],
+              ['O', 'O', '.', '.', '#', '.', '.', '.', '.', '#'],
+              ['O', 'O', '.', '.', 'O', '#', '#', '.', '.', 'O'],
+              ['O', '.', '.', '#', '.', 'O', 'O', '.', '.', '.'],
+              ['.', '.', '.', '.', '.', '.', '.', '.', '#', '.'],
+              ['.', '.', '#', '.', '.', '.', '.', '#', '.', '#'],
+              ['.', '.', 'O', '.', '.', '#', '.', 'O', '.', 'O'],
+              ['.', '.', 'O', '.', '.', '.', '.', '.', '.', '.'],
+              ['#', '.', '.', '.', '.', '#', '#', '#', '.', '.'],
+              ['#', '.', '.', '.', '.', '#', '.', '.', '.', '.'],
+            ]
+          ),
+          136
+        }
+      };
+
+    public static IEnumerable<object[]> ParseTestData =>
+      new List<object[]>
+      {
+        new object[]
+        {
+          new string[]
+          {
+            "O....#....",
+            "O.OO#....#",
+            ".....##...",
+            "OO.#O....O",
+            ".O.....O#.",
+            "O.#..O.#.#",
+            "..O..#O..O",
+            ".......O..",
+            "#....###..",
+            "#OO..#....",
+          },
+          new Dish(
+            [
+              ['O', '.', '.', '.', '.', '#', '.', '.', '.', '.'],
+              ['O', '.', 'O', 'O', '#', '.', '.', '.', '.', '#'],
+              ['.', '.', '.', '.', '.', '#', '#', '.', '.', '.'],
+              ['O', 'O', '.', '#', 'O', '.', '.', '.', '.', 'O'],
+              ['.', 'O', '.', '.', '.', '.', '.', 'O', '#', '.'],
+              ['O', '.', '#', '.', '.', 'O', '.', '#', '.', '#'],
+              ['.', '.', 'O', '.', '.', '#', 'O', '.', '.', 'O'],
+              ['.', '.', '.', '.', '.', '.', '.', 'O', '.', '.'],
+              ['#', '.', '.', '.', '.', '#', '#', '#', '.', '.'],
+              ['#', 'O', 'O', '.', '.', '#', '.', '.', '.', '.'],
+            ]
+          ),
+        }
+      };
+  }
+}
\ No newline at end of file
diff --git a/14/ParabolicReflectorDish.Tests/UnitTest1.cs b/14/ParabolicReflectorDish.Tests/UnitTest1.cs
deleted file mode 100644
index 0c4d24c..0000000
--- a/14/ParabolicReflectorDish.Tests/UnitTest1.cs
+++ /dev/null
@@ -1,10 +0,0 @@
-namespace ParabolicReflectorDish.Tests;
-
-public class UnitTest1
-{
-    [Fact]
-    public void Test1()
-    {
-
-    }
-}
\ No newline at end of file
diff --git a/14/ParabolicReflectorDish/Program.cs b/14/ParabolicReflectorDish/Program.cs
index 3751555..25e4e47 100644
--- a/14/ParabolicReflectorDish/Program.cs
+++ b/14/ParabolicReflectorDish/Program.cs
@@ -1,2 +1,107 @@
-// See https://aka.ms/new-console-template for more information
-Console.WriteLine("Hello, World!");
+using System.Diagnostics;
+
+namespace ParabolicReflectorDish;
+
+public class Program
+{
+  public static async Task<int> Main(string[] args)
+  {
+    if (args.Length is 0)
+    {
+      Console.WriteLine("Please provide a path to the input file.");
+      return -1;
+    }
+
+    if (File.Exists(args[0]) is false)
+    {
+      Console.WriteLine("The provided file does not exist.");
+      return -2;
+    }
+
+    var input = await File.ReadAllLinesAsync(args[0]);
+
+    var stopwatch = new Stopwatch();
+    stopwatch.Start();
+
+    var result = Dish
+      .Parse(input)
+      .CalculateTotalLoad();
+
+    stopwatch.Stop();
+
+    Console.WriteLine($"The total load is {result}. ({stopwatch.ElapsedMilliseconds}ms)");
+
+    return (int)result;
+  }
+}
+
+public class Dish(
+  List<List<char>> rows
+)
+{
+  private const char RoundRockSymbol = 'O';
+  private const char SquareRockSymbol = '#';
+  private const char EmptySpaceSymbol = '.';
+
+  public List<List<char>> Rows { get; init; } = rows;
+
+  private List<List<char>> TiltDishToNorth(List<List<char>> rows)
+  {
+    var modifiedRows = rows.ToList();
+    var numOfColumns = modifiedRows[0].Count;
+    var numOfRows = modifiedRows.Count;
+
+    for (var currentColumnIndex = 0; currentColumnIndex < numOfColumns; currentColumnIndex++)
+    {
+      for (var currentRowIndex = 0; currentRowIndex < numOfRows; currentRowIndex++)
+      {
+        var current = modifiedRows[currentRowIndex][currentColumnIndex];
+
+        if (current is EmptySpaceSymbol)
+        {
+          for (var i = currentRowIndex + 1; i < numOfRows; i++)
+          {
+            var next = modifiedRows[i][currentColumnIndex];
+
+            if (next is SquareRockSymbol)
+            {
+              break;
+            }
+
+            if (next is RoundRockSymbol)
+            {
+              modifiedRows[currentRowIndex][currentColumnIndex] = RoundRockSymbol;
+              modifiedRows[i][currentColumnIndex] = EmptySpaceSymbol;
+              break;
+            }
+          }
+        }
+      }
+    }
+
+    return modifiedRows;
+  }
+
+  public long CalculateTotalLoad()
+  {
+    var rows = TiltDishToNorth(Rows);
+    rows.Reverse();
+
+    return rows
+      .Select((r, index) =>
+      {
+        var numOfRoundRocks = r.Where(c => c is RoundRockSymbol).Count();
+        return (index + 1) * numOfRoundRocks;
+      })
+      .Sum();
+  }
+
+  public static Dish Parse(string[] input)
+  {
+    var inputList = input
+      .Select(s => s.ToList())
+      .ToList();
+
+    return new Dish(inputList);
+  }
+}
\ No newline at end of file