feat: Add saving and loading of animations and eases

src/main/java/me/topchetoeu/smoothchunks/ConfigManager.java

@@ -1,11 +1,74 @@
 package me.topchetoeu.smoothchunks;
 
 import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+
+import me.topchetoeu.smoothchunks.animation.Animation;
+import me.topchetoeu.smoothchunks.easing.Ease;
 
 public class ConfigManager {
     public final File configFile;
+    private final Manager<Animation> animation;
+    private final Manager<Ease> ease;
 
-    public ConfigManager(File configFile) {
+    private String readString(InputStreamReader reader) throws IOException {
+        String res = "";
+        int i;
+
+        while ((i = reader.read()) != 0) {
+            if (i == -1) break;
+            res += (char)i;
+        }
+
+        return res;
+    }
+    private void writeString(OutputStreamWriter writer, String str) throws IOException {
+        for (int i = 0; i < str.length(); i++) {
+            writer.write((char)str.charAt(i));
+        }
+        writer.write(0);
+    }
+
+    public void reload() {
+        try {
+            var reader = new FileReader(configFile);
+            String animation = readString(reader);
+            String ease = readString(reader);
+
+            reader.close();
+
+            this.animation.set(animation);
+            this.ease.set(ease);
+        }
+        catch (FileNotFoundException e) {
+            save();
+        }
+        catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    public void save() {
+        try {
+            var writer = new FileWriter(configFile);
+            writeString(writer, animation.get().getName());
+            writeString(writer, ease.get().getName());
+            writer.close();
+        }
+        catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public ConfigManager(File configFile, Manager<Animation> animation, Manager<Ease> ease) {
         this.configFile = configFile;
+        this.animation = animation;
+        this.ease = ease;
+
+        reload();
     }
 }