From 6c43ae6078caa02bd28f2e61039e466f83ec0a1d Mon Sep 17 00:00:00 2001
From: Chris Kaczor <chris@kaczorzoo.net>
Date: Thu, 12 Dec 2019 19:16:59 -0500
Subject: [PATCH] Day 12 - Part 1

---
 Advent.csproj.DotSettings |   1 +
 Day12/Day12.cs            | 116 ++++++++++++++++++++++++++++++++++++++
 Program.cs                |   3 +-
 3 files changed, 119 insertions(+), 1 deletion(-)
 create mode 100644 Day12/Day12.cs

diff --git a/Advent.csproj.DotSettings b/Advent.csproj.DotSettings
index f36e4a8..f9d7a19 100644
--- a/Advent.csproj.DotSettings
+++ b/Advent.csproj.DotSettings
@@ -2,6 +2,7 @@
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day1/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day10/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day11/@EntryIndexedValue">True</s:Boolean>
+	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day12/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day2/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day3/@EntryIndexedValue">True</s:Boolean>
 	<s:Boolean x:Key="/Default/CodeInspection/NamespaceProvider/NamespaceFoldersToSkip/=day4/@EntryIndexedValue">True</s:Boolean>
diff --git a/Day12/Day12.cs b/Day12/Day12.cs
new file mode 100644
index 0000000..9d7585a
--- /dev/null
+++ b/Day12/Day12.cs
@@ -0,0 +1,116 @@
+using System;
+using System.Collections.Generic;
+
+namespace Advent
+{
+    public static class Day12
+    {
+        private class Coordinates
+        {
+            public Coordinates(int x, int y, int z)
+            {
+                X = x;
+                Y = y;
+                Z = z;
+            }
+
+            public int X { get; set; }
+            public int Y { get; set; }
+            public int Z { get; set; }
+        }
+
+        private class Moon
+        {
+            public Moon(int x, int y, int z)
+            {
+                Position = new Coordinates(x, y, z);
+                Velocity = new Coordinates(0, 0, 0);
+            }
+
+            public Coordinates Position { get; }
+            public Coordinates Velocity { get; }
+        }
+
+        public static void Execute()
+        {
+            /*
+                <x=-4, y=-9, z=-3>
+                <x=-13, y=-11, z=0>
+                <x=-17, y=-7, z=15>
+                <x=-16, y=4, z=2>
+             */
+
+            var moons = new List<Moon>
+            {
+                new Moon(-4, -9, -3) ,
+                new Moon(-13, -11, 0),
+                new Moon(-17,  -7, 15 ),
+                new Moon(-16, 4,  2 )
+            };
+
+            for (var count = 1; count <= 1000; count++)
+            {
+                for (var a = 0; a <= 3; a++)
+                {
+                    for (var b = a + 1; b <= 3; b++)
+                    {
+                        var moonA = moons[a];
+                        var moonB = moons[b];
+
+                        if (moonA.Position.X > moonB.Position.X)
+                        {
+                            moonB.Velocity.X++;
+                            moonA.Velocity.X--;
+                        }
+                        else if (moonA.Position.X < moonB.Position.X)
+                        {
+                            moonA.Velocity.X++;
+                            moonB.Velocity.X--;
+                        }
+
+                        if (moonA.Position.Y > moonB.Position.Y)
+                        {
+                            moonB.Velocity.Y++;
+                            moonA.Velocity.Y--;
+                        }
+                        else if (moonA.Position.Y < moonB.Position.Y)
+                        {
+                            moonA.Velocity.Y++;
+                            moonB.Velocity.Y--;
+                        }
+
+                        if (moonA.Position.Z > moonB.Position.Z)
+                        {
+                            moonB.Velocity.Z++;
+                            moonA.Velocity.Z--;
+                        }
+                        else if (moonA.Position.Z < moonB.Position.Z)
+                        {
+                            moonA.Velocity.Z++;
+                            moonB.Velocity.Z--;
+                        }
+                    }
+                }
+
+                foreach (var moon in moons)
+                {
+                    moon.Position.X += moon.Velocity.X;
+                    moon.Position.Y += moon.Velocity.Y;
+                    moon.Position.Z += moon.Velocity.Z;
+                }
+            }
+
+            var totalEnergy = 0;
+
+            foreach (var moon in moons)
+            {
+                var potentialEnergy = Math.Abs(moon.Position.X) + Math.Abs(moon.Position.Y) + Math.Abs(moon.Position.Z);
+                var kineticEnergy = Math.Abs(moon.Velocity.X) + Math.Abs(moon.Velocity.Y) + Math.Abs(moon.Velocity.Z);
+
+                totalEnergy += (potentialEnergy * kineticEnergy);
+            }
+
+            Console.WriteLine(totalEnergy);
+        }
+    }
+}
diff --git a/Program.cs b/Program.cs
index 406c8a0..6e5b7d0 100644
--- a/Program.cs
+++ b/Program.cs
@@ -14,7 +14,8 @@
             //Day8.Execute();
             //Day9.Execute();
             //Day10.Execute();
-            Day11.Execute();
+            //Day11.Execute();
+            Day12.Execute();
         }
     }
 }