chnaged file to memory

src/main/java/cz/kamma/darts/App.java

@@ -16,7 +16,7 @@ import java.util.stream.Collectors;
 
 public class App {
     private static final Gson GSON = new Gson();
-    private static final String DATA_FILE = "stats.json";
+    private static final List<DartsGame> GAMES_CACHE = Collections.synchronizedList(new ArrayList<>());
     private static final long MAX_UPLOAD_SIZE = 5 * 1024 * 1024; // 5MB
 
     public static void main(String[] args) throws IOException {
@@ -26,6 +26,7 @@ public class App {
         server.createContext("/", new StaticHandler());
         server.createContext("/api/stats", new StatsHandler());
         server.createContext("/api/upload", new UploadHandler());
+        server.createContext("/api/clear", new ClearHandler());
         
         server.setExecutor(null);
         System.out.println("Server started on port " + port);
@@ -103,7 +104,8 @@ public class App {
                 List<RawGame> rawGames = GSON.fromJson(body, new TypeToken<List<RawGame>>(){}.getType());
                 List<DartsGame> convertedGames = convertRawToGames(rawGames);
                 
-                Files.writeString(Paths.get(DATA_FILE), GSON.toJson(convertedGames));
+                GAMES_CACHE.clear();
+                GAMES_CACHE.addAll(convertedGames);
                 
                 String response = "Upload successful";
                 byte[] responseBytes = response.getBytes(StandardCharsets.UTF_8);
@@ -181,8 +183,7 @@ public class App {
                 return;
             }
 
-            List<DartsGame> games = loadGames();
+            StatsResponse response = aggregateStats(new ArrayList<>(GAMES_CACHE));
-            StatsResponse response = aggregateStats(games);
             
             String json = GSON.toJson(response);
             byte[] bytes = json.getBytes(StandardCharsets.UTF_8);
@@ -194,19 +195,6 @@ public class App {
             os.close();
         }
 
-        private List<DartsGame> loadGames() {
-            try {
-                if (!Files.exists(Paths.get(DATA_FILE))) {
-                    return Collections.emptyList();
-                }
-                String content = Files.readString(Paths.get(DATA_FILE));
-                return GSON.fromJson(content, new TypeToken<List<DartsGame>>(){}.getType());
-            } catch (IOException e) {
-                e.printStackTrace();
-                return Collections.emptyList();
-            }
-        }
-
         private StatsResponse aggregateStats(List<DartsGame> games) {
             Map<String, List<DartsGame>> byPlayer = games.stream()
                     .collect(Collectors.groupingBy(DartsGame::getPlayer));
@@ -240,4 +228,22 @@ public class App {
                     .build();
         }
     }
+
+    static class ClearHandler implements HttpHandler {
+        @Override
+        public void handle(HttpExchange exchange) throws IOException {
+            if (!"POST".equals(exchange.getRequestMethod())) {
+                exchange.sendResponseHeaders(405, -1);
+                return;
+            }
+
+            GAMES_CACHE.clear();
+            String response = "Cache cleared";
+            byte[] responseBytes = response.getBytes(StandardCharsets.UTF_8);
+            exchange.sendResponseHeaders(200, responseBytes.length);
+            try (OutputStream os = exchange.getResponseBody()) {
+                os.write(responseBytes);
+            }
+        }
+    }
 }

src/main/resources/web/index.html

@@ -166,6 +166,7 @@
                 <h2 style="margin: 0 0 8px 0; font-size: 1.1rem">Upload Stats JSON</h2>
                 <input type="file" id="fileInput" accept=".json">
                 <button onclick="uploadFile()">Upload</button>
+                <button onclick="clearCache()" style="background: #475569; margin-left: 10px;">Clear Cache</button>
             </div>
             <span id="uploadStatus" style="font-weight: 600"></span>
         </div>
@@ -230,6 +231,22 @@
             reader.readAsText(file);
         }
 
+        async function clearCache() {
+            if (!confirm('Are you sure you want to clear all data?')) return;
+            const status = document.getElementById('uploadStatus');
+            try {
+                const response = await fetch('/api/clear', { method: 'POST' });
+                if (response.ok) {
+                    status.innerText = 'Cache cleared!';
+                    loadStats();
+                } else {
+                    status.innerText = 'Clear failed: ' + await response.text();
+                }
+            } catch (err) {
+                status.innerText = 'Error: ' + err.message;
+            }
+        }
+
         async function loadStats() {
             const response = await fetch('/api/stats');
             const data = await response.json();