test pass

PlaylistChallenge.iml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module org.jetbrains.idea.maven.project.MavenProjectsManager.isMavenModule="true" type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_5">
+    <output url="file://$MODULE_DIR$/target/classes" />
+    <output-test url="file://$MODULE_DIR$/target/test-classes" />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src/main/java" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/src/test/java" isTestSource="true" />
+      <excludeFolder url="file://$MODULE_DIR$/target" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" scope="TEST" name="Maven: junit:junit:4.12" level="project" />
+    <orderEntry type="library" scope="TEST" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
+    <orderEntry type="library" name="Maven: org.apache.commons:commons-lang3:3.9" level="project" />
+  </component>
+</module>

pom.xml

@@ -16,5 +16,11 @@
             <version>4.12</version>
             <scope>test</scope>
         </dependency>
+
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>3.9</version>
+        </dependency>
     </dependencies>
 </project>

src/main/java/io/zipcoder/Music.java

@@ -1,14 +1,144 @@
 package io.zipcoder;
+import org.apache.commons.lang3.ArrayUtils;
+import java.lang.Math;
+import java.lang.reflect.Array;
+
 
 public class Music {
 
     private String[] playList;
 
-    public Music(String[] playList){
+    public Music(String[] playList) {
         this.playList = playList;
     }
 
-    public Integer selection(Integer startIndex, String selection){
-        return null;
+    public Integer selection(Integer startIndex, String selection) {
+
+
+
+        int fwdCount = 0;
+        int bwdCount = 0;
+
+        int newSongIndex = ArrayUtils.indexOf(playList, selection);
+
+        if (newSongIndex > startIndex)
+        {
+
+        }
+
+
+        for (int i = startIndex; i < playList.length; i++) {
+
+            if (playList[i].equals(selection))
+                {break;}
+
+            fwdCount++;
+
+            if(i == (playList.length-1))
+            {
+                i = -1;   //because we have to include another click to go from the end to the beginning
+            }
+        }
+
+        for (int j = startIndex; j >= 0; j--) {
+            if (playList[j].equals(selection)) {
+                break;}
+             bwdCount++;
+             if (j == 0) {
+                j = playList.length;  //because we have to do another click from the beginning back to the end.
+            }
+
+        }
+
+        if (bwdCount < fwdCount) {
+            return bwdCount;
+        } else {
+            return fwdCount;
+        }
     }
 }
+
+//            for (int j = startIndex; j < startIndex + playList.length - 1; j--) {
+//                if (!playList[playList.length + i % playList.length].equals(selection)) {
+//                    bwdCount++;
+//                    break;
+
+
+//
+//        int newSongIndex = ArrayUtils.indexOf(playList, selection);
+//        int check = checkPlaylist(playList, startIndex, newSongIndex);
+//
+//        int newSongIndex2 = checkForDuplicateIndex(playList,  selection);
+//        //int newSongIndex2 = ArrayUtils.indexOf(playList, selection, newSongIndex);
+//        int check2 = checkPlaylist(playList, startIndex, newSongIndex2);
+//        int result = shorterClicks(check, check2);
+//
+//
+//        return result;
+//    }
+//
+//    public int checkPlaylist (String[] playList, Integer startIndex, int newSongIndex)
+//    {
+//
+//        int clicksFwd=0;
+//        int clicksBwd=0;
+//        int loopsAround=0;
+//        if (newSongIndex > startIndex)
+//        {
+//            clicksFwd = newSongIndex - startIndex;
+//            loopsAround = (startIndex) + ((playList.length) - newSongIndex+1);
+//
+//            if (clicksFwd < loopsAround)
+//            {return clicksFwd;}
+//            else if (loopsAround < clicksFwd)
+//            {return loopsAround;}
+//
+//        }
+//        else if (newSongIndex < startIndex)
+//        {
+//            clicksBwd = startIndex - newSongIndex;
+//            loopsAround= (newSongIndex) + ((playList.length)-startIndex);
+//            if (clicksBwd < loopsAround)
+//            {return clicksBwd;}
+//            else if (loopsAround < clicksBwd)
+//            {return loopsAround;}
+//        }
+//        return 0;
+//    }
+//    public int  checkForDuplicateIndex (String[] playList, String selection)
+//    {
+//        int newSongIndex2=0;
+//
+//            for (int i=playList.length-1; i>= 0; i--)
+//                {
+//
+//                    if(playList[i].equals(selection))
+//                    {
+//                        newSongIndex2 = i;
+//
+//                        return newSongIndex2;
+//
+//                    }
+//                }
+//
+//
+//        return newSongIndex2;
+//    }
+//
+//    public int shorterClicks (int check, int check2)
+//    {
+//        if (check < check2)
+//        {
+//            return check;
+//        }
+//        else if (check2 < check)
+//        {
+//            return check2;
+//        }
+//        return check;
+//    }
+
+
+
+
+