feat(highscore): add methods for highscore handling

src/highscore.py

@@ -2,16 +2,46 @@ import json
 
 class Highscore:
     def __init__(self):
+        # fix path to json file with highscores
         self.path = "./highscore.json"
 
+        # check if file already exists, otherwise create it
+        try:
+            with open(self.path, "r") as f:
+                pass
+        except FileNotFoundError:
+            self.save_scores([])
+
     def load_scores(self):
-        pass
+        with open(self.path, "r") as f:
+            return json.load(f)
 
     def save_scores(self, scores):
-        pass
+        with open(self.path, "w") as file:
+            json.dump(scores, file, indent=4)
 
     def add_score(self, player_name, score_ects, time_survived, won):
-        pass
+        # load existing scores from file
+        scores = self.load_scores()
 
-    def get_top_scores(self, number_of_top_scores):
-        pass
+        # assign values from new score and append to existing scores
+        new_score = {
+            "name": player_name,
+            "ects": score_ects,
+            "time": time_survived,
+            "won": won
+        }
+        scores.append(new_score)
+
+        # sort by ects descending
+        scores.sort(key=lambda score: score["ects"], reverse=True)
+
+        # keep only top 50 elements
+        scores = scores[:50]
+
+        self.save_scores(scores)
+
+    def get_top_scores(self):
+        scores = self.load_scores()
+        scores.sort(key=lambda score: score["ects"], reverse=True)
+        return scores[:5]