From 26374f143cbb7400d96b1772382b9b7c044663b3 Mon Sep 17 00:00:00 2001
From: Andrew Cooper <andrew.cooper@nearmap.com>
Date: Sun, 31 Oct 2021 10:46:39 +1100
Subject: [PATCH] Add TowerDisplay

---
 90 Tower/csharp/Tower/Models/Needle.cs   | 10 +++----
 90 Tower/csharp/Tower/Models/Towers.cs   |  4 +--
 90 Tower/csharp/Tower/UI/TowerDisplay.cs | 37 ++++++++++++++++++++++++
 3 files changed, 44 insertions(+), 7 deletions(-)
 create mode 100644 90 Tower/csharp/Tower/UI/TowerDisplay.cs

diff --git a/90 Tower/csharp/Tower/Models/Needle.cs b/90 Tower/csharp/Tower/Models/Needle.cs
index e373efe9..f47329d6 100644
--- a/90 Tower/csharp/Tower/Models/Needle.cs	
+++ b/90 Tower/csharp/Tower/Models/Needle.cs	
@@ -8,13 +8,13 @@ namespace Tower.Models
     {
         private readonly Stack<int> _disks = new Stack<int>();
 
-        public int Top => _disks.TryPeek(out var disc) ? disc : default;
+        public int Top => _disks.TryPeek(out var disk) ? disk : default;
 
-        public bool TryPut(int disc)
+        public bool TryPut(int disk)
         {
-            if (_disks.Count == 0 || disc < _disks.Peek())
+            if (_disks.Count == 0 || disk < _disks.Peek())
             {
-                _disks.Push(disc);
+                _disks.Push(disk);
                 return true;
             }
 
@@ -24,7 +24,7 @@ namespace Tower.Models
         public bool TryGetTopDisk(out int disk) => _disks.TryPop(out disk);
 
         public IEnumerator<int> GetEnumerator() =>
-            Enumerable.Repeat(1, 7 - _disks.Count).Concat(_disks).GetEnumerator();
+            Enumerable.Repeat(0, 7 - _disks.Count).Concat(_disks).GetEnumerator();
 
         IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
     }
diff --git a/90 Tower/csharp/Tower/Models/Towers.cs b/90 Tower/csharp/Tower/Models/Towers.cs
index 830fa631..7672ad52 100644
--- a/90 Tower/csharp/Tower/Models/Towers.cs	
+++ b/90 Tower/csharp/Tower/Models/Towers.cs	
@@ -36,7 +36,7 @@ namespace Tower.Models
 
         IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
 
-        private class TowersEnumerator : IEnumerator<(int First, int Second, int Third)>
+        private class TowersEnumerator : IEnumerator<(int, int, int)>
         {
             private readonly List<IEnumerator<int>> _enumerators;
 
@@ -45,7 +45,7 @@ namespace Tower.Models
                 _enumerators = needles.Select(n => n.GetEnumerator()).ToList();
             }
 
-            public (int First, int Second, int Third) Current =>
+            public (int, int, int) Current =>
                 (_enumerators[0].Current, _enumerators[1].Current, _enumerators[2].Current);
 
             object IEnumerator.Current => Current;
diff --git a/90 Tower/csharp/Tower/UI/TowerDisplay.cs b/90 Tower/csharp/Tower/UI/TowerDisplay.cs
new file mode 100644
index 00000000..f8a56261
--- /dev/null
+++ b/90 Tower/csharp/Tower/UI/TowerDisplay.cs	
@@ -0,0 +1,37 @@
+using System;
+using System.Text;
+using Tower.Models;
+
+namespace Tower.UI
+{
+    internal class TowerDisplay
+    {
+        private readonly Towers _towers;
+
+        public TowerDisplay(Towers towers)
+        {
+            _towers = towers;
+        }
+
+        public override string ToString()
+        {
+            var builder = new StringBuilder();
+
+            foreach (var row in _towers)
+            {
+                AddTower(row.Item1);
+                AddTower(row.Item2);
+                AddTower(row.Item3);
+                builder.AppendLine();
+            }
+
+            return builder.ToString();
+
+            void AddTower(int size)
+            {
+                var padding = 10 - size / 2;
+                builder.Append(' ', padding).Append('*', Math.Max(1, size)).Append(' ', padding);
+            }
+        }
+    }
+}
\ No newline at end of file