Add ShortCode static additions for patterned codes

Author: colinangusmackay

src/Stravaig.ShortCode.Tests/ShortCodeTests.cs

@@ -105,6 +105,32 @@ public void Use_SetsTheInternalGeneratorToCryptographicallyRandom()
             generator.ShouldBeOfType(typeof(CryptographicallyRandomCodeGenerator));
         }
 
+        [Test]
+        public void GeneratePatternedShortCode_GetsAPatternedShortCode()
+        {
+            var shortCode = ShortCode.GeneratePatternedShortCode();
+            Console.WriteLine(shortCode);
+            shortCode.ShouldNotBeNull();
+            shortCode.ShouldMatch(@"\w\w\w-\w\w\w-\w\w\w");
+        }
+
+        [Test]
+        public void SetPattern_ChangesThePattern()
+        {
+            ShortCode.SetPattern(new[]
+            {
+                new PatternPart(NamedCharacterSpaces.UpperLatinLetters, 2),
+                new PatternPart("-"),
+                new PatternPart(NamedCharacterSpaces.Digits, 4),
+                new PatternPart("-"),
+                new PatternPart(NamedCharacterSpaces.LowerLatinLetters, 2)
+            });
+            var shortCode = ShortCode.GeneratePatternedShortCode();
+            Console.WriteLine(shortCode);
+            shortCode.ShouldNotBeNull();
+            shortCode.ShouldMatch(@"[A-Z]{2}-[0-9]{4}-[a-z]{2}");
+        }
+        
         private static IEnumerable<int> Lengths()
         {
             for (int i = 1; i <= 9; i++)

src/Stravaig.ShortCode/PatternedEncoder.cs

@@ -56,14 +56,6 @@ private ulong BuildShortCode(ulong fullCode, PatternPart part, char[] code, int
         public int MaxLength()
         {
             throw new NotImplementedException();
-            int result = 0;
-            ulong remainingRange = ulong.MaxValue; 
-            foreach (var part in _parts)
-            {
-                result += (int)(Math.Log(remainingRange) / Math.Log(part.Length));
-            }
-
-            return result;
         }
 
         public string NamedCharacterSpace =>

src/Stravaig.ShortCode/ShortCode.cs

@@ -39,6 +39,12 @@ public static string GenerateRandomShortCode(int? length = null)
             return _encoder.Convert(code, length ?? _defaultLength);
         }
 
+        public static string GeneratePatternedShortCode()
+        {
+            ulong code = _randomGenerator.GetNextCode();
+            return _patternedEncoder.Convert(code);
+        }
+
         public static void SetSequentialSeed(ulong seed)
         {
             _sequentialCodeGenerator = new SequentialCodeGenerator(seed);