Finalize level API and new Json library

1 files changed, 81 insertions, 0 deletions

diff --git a/src/main/java/net/sowgro/npehero/levelapi/Leaderboard.java b/src/main/java/net/sowgro/npehero/levelapi/Leaderboard.java
new file mode 100644
index 0000000..bb1f30c
--- /dev/null
+++ b/src/main/java/net/sowgro/npehero/levelapi/Leaderboard.java
@@ -0,0 +1,81 @@
+package net.sowgro.npehero.levelapi;
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+
+import java.io.File;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.time.LocalDate;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class Leaderboard {
+
+    public final ObservableList<LeaderboardEntry> entries = FXCollections.observableArrayList();
+    private final Gson json = new GsonBuilder().serializeNulls().setPrettyPrinting().create();
+    private final File file;
+
+    public Leaderboard(File file) throws IOException{
+        this.file = file;
+        read();
+    }
+
+    /**
+     * Adds new leaderboardEntry to list and updates json file
+     * @param name: The players name
+     * @param score The players score
+     * @throws IOException If there is a problem updating the leaderboard file.
+     */
+    public void add(String name, int score) throws IOException {
+        entries.add(new LeaderboardEntry(name, score, LocalDate.now().toString()));
+        save();
+    }
+
+    /**
+     * Writes leaderboard to json file
+     * @throws IOException If there are problems writing to the file.
+     */
+    public void save() throws IOException {
+        file.createNewFile();
+        List<Map<String, Object>> data = json.fromJson(new FileReader(file), List.class);
+        for (LeaderboardEntry cur : entries) {
+            Map<String, Object> obj = new HashMap<>();
+            obj.put("name", cur.name);
+            obj.put("score", cur.score);
+            obj.put("date", cur.date);
+            data.add(obj);
+        }
+        FileWriter fileWriter = new FileWriter(file);
+        json.toJson(data, fileWriter);
+        fileWriter.close();
+    }
+
+    /**
+     * Reads in json leaderboard and assigns populates list with leaderboardEntries
+     * @throws IOException If there are problems reading the file
+     */
+    public void read() throws IOException {
+        if (!file.exists()) {
+            return;
+        }
+        List<Map<String, Object>> data = json.fromJson(new FileReader(file), List.class);
+        if (data == null) {
+            return;
+        }
+        for (Map<String, Object> cur: data) {
+            String name = (String) cur.getOrDefault("name", null);
+            int score = (int) (double) cur.getOrDefault("score", -1);
+            String date = (String) cur.getOrDefault("date", null);
+            if (name == null || score == -1 || date == null) {
+                System.out.println("dbg: bad entry skipped");
+                continue; // discard invalid entries
+            }
+            entries.add(new LeaderboardEntry(name, score, date));
+        }
+    }
+}