Change methods for better indipendence

src/main/java/it/unibo/bombardero/map/api/BombarderoTimer.java

@@ -14,17 +14,23 @@ public interface BombarderoTimer {
     void startTimer();
 
     /**
-     * Checks if the time is over, if such it alerts the @manager 
-     * so the proper changes can be made to the map. 
+     * Updates the timer
      * This method is assumed to be called peiodically and after the @startTimer method
      * has been called at least once. 
      */
     void updateTimer();
 
+    /** 
+     * Returns the time left for the logic to check, no formatting is done
+     * @return the time left
+    */
+    long getTimeLeft();
+
     /**
-     * Formats the time properly for displaying as such: "MM:SS"
+     * Formats the time properly for displaying as such: "MM:SS" and 
+     * returns a String type
      * @return the properly formatted time
      */
-    String getTimeLeft();
+    String getFormattedTimeLeft();
 
 }

src/main/java/it/unibo/bombardero/map/impl/BombarderoTimerImpl.java

@@ -12,6 +12,7 @@ public class BombarderoTimerImpl implements BombarderoTimer {
     private final static String TIME_SEPARATOR = ":";
 
     private long startTime = 0l;
+    private long timeLeft = 0l;
     private final MapManager manager;
 
     public BombarderoTimerImpl(MapManager manager) {
@@ -25,13 +26,16 @@ public void startTimer() {
 
     @Override
     public void updateTimer() {
-        if(System.currentTimeMillis() - startTime >= Utils.GAME_TIME) {
-            manager.triggerArenaCollpse();
-        }
+        this.timeLeft = System.currentTimeMillis() - startTime;
+    }
+
+    public long getTimeLeft() {
+        updateTimer();
+        return this.timeLeft;
     }
 
     @Override
-    public String getTimeLeft() {
+    public String getFormattedTimeLeft() {
         double secondsLeft = (System.currentTimeMillis() - this.startTime)/SECONDS_TO_MILLIS;
         return Double.toString(Math.ceil(secondsLeft/BombarderoTimerImpl.MINUTES_TO_SECONDS)) + 
             BombarderoTimerImpl.TIME_SEPARATOR +