Berlin clock exercise - Dev Test

.gitignore

@@ -0,0 +1,7 @@
+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+.vs/
+bin
+obj
+packages

BDD/BerlinClockFeatureSteps.feature

@@ -48,4 +48,4 @@ RRRR
 RRRR
 OOOOOOOOOOO
 OOOO
-"""
+"""

BerlinClock.csproj

@@ -50,6 +50,9 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="BDD\BerlinClockFeatureSteps.cs" />
+    <Compile Include="Classes\Constants.cs" />
+    <Compile Include="Utils\StringUtils.cs" />
+    <Compile Include="Utils\TimeUtils.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="BDD\BerlinClockFeatureSteps.feature.cs">
       <AutoGen>True</AutoGen>

Classes/Constants.cs

@@ -0,0 +1,9 @@
+namespace BerlinClock.Classes
+{
+    public static class Constants
+    {
+        public const char SwitchedOffCharacter = 'O';
+        public const char SwitchedOnRedCharacter = 'R';
+        public const char SwitchedOnYellowCharacter = 'Y';
+    }
+}

Classes/ITimeConverter.cs

@@ -1,7 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
 
 namespace BerlinClock
 {

Classes/TimeConverter.cs

@@ -1,15 +1,81 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Text;
+using BerlinClock.Classes;
+using BerlinClock.Utils;
 
 namespace BerlinClock
 {
     public class TimeConverter : ITimeConverter
     {
         public string convertTime(string aTime)
         {
-            throw new NotImplementedException();
+            var result = new List<string>();
+
+            var timeForBerlinClock = TimeUtils.ConvertTimeStringTo24Format(aTime);
+
+            result.Add(GetLampForSeconds(timeForBerlinClock.Seconds));
+            result.Add(GetLampsForHours((int)timeForBerlinClock.TotalHours, 1));
+            result.Add(GetLampsForHours((int)timeForBerlinClock.TotalHours, 2));
+            result.Add(GetLampsForMinutesThirdRow(timeForBerlinClock.Minutes));
+            result.Add(GetLampsForMinutesFourthRow(timeForBerlinClock.Minutes));
+
+            return StringUtils.JoinStringLines(result.ToArray());
+        }
+
+        private string GetLampForSeconds(int seconds)
+        {
+            if ((seconds < 0) || (seconds > 59))
+                throw new ArgumentException("Parameter seconds must be between 0 and 59");
+
+            return seconds % 2 == 0 ? Constants.SwitchedOnYellowCharacter.ToString()
+            : Constants.SwitchedOffCharacter.ToString();
+        }
+
+        private string GetLampsForHours(int hours, int nRow)
+        {
+            if ((hours < 0) || (hours > 24))
+                throw new ArgumentException("Parameter hours must be between 0 and 24");
+
+            if ((nRow != 1) && (nRow != 2))
+                throw new ArgumentException("Parameter nRow must be 1 or 2");
+
+            // every switched on lamp count 5 hours
+            var lampsArray = Enumerable.Repeat(Constants.SwitchedOffCharacter, 4).ToArray();
+            var numberOfSwitchedOnLamps = nRow == 1 ? hours / 5 : hours % 5;
+            for (var nLamp = 0; nLamp < numberOfSwitchedOnLamps; nLamp++)
+                lampsArray[nLamp] = Constants.SwitchedOnRedCharacter;
+
+            return string.Join("", lampsArray);
+        }
+
+        private string GetLampsForMinutesThirdRow(int minutes)
+        {
+            if ((minutes < 0) || (minutes > 59))
+                throw new ArgumentException("Parameter minutes must be between 0 and 59");
+
+            // every switched on lamp count 5 minutes
+            var lampsArray = Enumerable.Repeat(Constants.SwitchedOffCharacter, 11).ToArray();
+            var numberOfSwitchedOnLamps = minutes / 5;
+            for (var nLamp = 0; nLamp < numberOfSwitchedOnLamps; nLamp++)
+                lampsArray[nLamp] = ((nLamp == 2) || (nLamp == 5) || (nLamp == 8)) ?
+                    Constants.SwitchedOnRedCharacter : Constants.SwitchedOnYellowCharacter;
+
+            return string.Join("", lampsArray);
+        }
+
+        private string GetLampsForMinutesFourthRow(int minutes)
+        {
+            if ((minutes < 0) || (minutes > 59))
+                throw new ArgumentException("Parameter minutes must be between 0 and 59");
+
+            // every switched on lamp count 1 minute
+            var lampsArray = Enumerable.Repeat(Constants.SwitchedOffCharacter, 4).ToArray();
+            var numberOfSwitchedOnLamps = minutes % 5;
+            for (var nLamp = 0; nLamp < numberOfSwitchedOnLamps; nLamp++)
+                lampsArray[nLamp] = Constants.SwitchedOnYellowCharacter;
+
+            return string.Join("", lampsArray);
         }
     }
 }

Utils/StringUtils.cs

@@ -0,0 +1,15 @@
+using System;
+
+namespace BerlinClock.Utils
+{
+    public static class StringUtils
+    {
+        public static string JoinStringLines(string[] lines)
+        {
+            if (lines.Length <= 0)
+                return String.Empty;
+
+            return String.Join(Environment.NewLine, lines);
+        }
+    }
+}

Utils/TimeUtils.cs

@@ -0,0 +1,18 @@
+using System;
+
+namespace BerlinClock.Utils
+{
+    public static class TimeUtils
+    {
+        public static TimeSpan ConvertTimeStringTo24Format(string time)
+        {
+            if (time.Equals("24:00:00")) // an exception (There is no "24th hour" support in the DateTime class)
+                return new TimeSpan(24, 0, 0);
+
+            if (!DateTime.TryParse(time, out DateTime dateConverted))
+                throw new ArgumentException("Parameter time can not be converted, because it is not valid");
+
+            return TimeSpan.Parse(dateConverted.ToString("HH:mm:ss"));
+        }
+    }
+}