From ac197c4d2b7cb787dd35c8f91f2c214063574b47 Mon Sep 17 00:00:00 2001
From: cyberdick <cyberdick.wn@gmail.com>
Date: Sat, 3 Dec 2022 19:07:33 +0530
Subject: [PATCH] complete day3 part 1

---
 AOC2022/Properties/launchSettings.json |  2 +-
 AOC2022/Puzzles/Day3.cs                | 60 +++++++++++++++++++++++++-
 2 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/AOC2022/Properties/launchSettings.json b/AOC2022/Properties/launchSettings.json
index 0a2369f..73935b7 100644
--- a/AOC2022/Properties/launchSettings.json
+++ b/AOC2022/Properties/launchSettings.json
@@ -2,7 +2,7 @@
 	"profiles": {
 		"WithParams": {
 			"commandName": "Project",
-			"commandLineArgs": "1 2",
+			"commandLineArgs": "3",
 			"workingDirectory": "./"
 		},
 		"WithoutParams": {
diff --git a/AOC2022/Puzzles/Day3.cs b/AOC2022/Puzzles/Day3.cs
index 5743f31..ecd327b 100644
--- a/AOC2022/Puzzles/Day3.cs
+++ b/AOC2022/Puzzles/Day3.cs
@@ -2,13 +2,71 @@ namespace AOC2022.Puzzles;
 
 internal class Day3 : IPuzzle
 {
+	private readonly string[] _linesFromFile;
+	private readonly int noOfRuckSacks;
+	private string[] _leftComparments;
+	private string[] _rightCompartments;
+
+	public Day3(string[] linesFromFile)
+	{
+		_linesFromFile = linesFromFile;
+		noOfRuckSacks = linesFromFile.Length;
+		SplitRuckSacks();
+	}
+
+	private void SplitRuckSacks()
+	{
+		_leftComparments = new string[noOfRuckSacks];
+		_rightCompartments = new string[noOfRuckSacks];
+		var index = 0;
+		foreach (var line in _linesFromFile)
+		{
+			var ruckSack = line.Trim();
+			var left = ruckSack[..(ruckSack.Length / 2)];
+			var right = ruckSack[(ruckSack.Length / 2)..];
+			_leftComparments[index] = left;
+			_rightCompartments[index] = right;
+			index++;
+		}
+	}
+
 	public void FirstPuzzle()
 	{
-		throw new NotImplementedException();
+		var prioritySum = 0;
+		for (int i = 0; i < noOfRuckSacks; i++)
+		{
+			char duplicateItem = ' ';
+			foreach (var item in _leftComparments[i])
+			{
+				if (_rightCompartments[i].Contains(item))
+				{
+					duplicateItem = item;
+					break;
+				}
+			}
+			prioritySum += EvaluatePriority(duplicateItem);
+		}
+		Console.WriteLine(prioritySum.ToString());
 	}
 
 	public void SecondPuzzle()
 	{
 		throw new NotImplementedException();
 	}
+
+	private static int EvaluatePriority(char ruckSackItem)
+	{
+		if (char.IsUpper(ruckSackItem))
+		{
+			return (ruckSackItem - 'A') + 27;
+		}
+		else if (char.IsLower(ruckSackItem))
+		{
+			return (ruckSackItem - 'a') + 1;
+		}
+		else
+		{
+			return 0;
+		}
+	}
 }