vanilla keybind override and config system

src/main/java/dev/isxander/controlify/config/ControlifyConfig.java

@@ -0,0 +1,81 @@
+package dev.isxander.controlify.config;
+
+import com.google.gson.*;
+import dev.isxander.controlify.controller.Controller;
+import dev.isxander.controlify.controller.ControllerConfig;
+import net.fabricmc.loader.api.FabricLoader;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+
+public class ControlifyConfig {
+    public static final Path CONFIG_PATH = FabricLoader.getInstance().getConfigDir().resolve("controlify.json");
+
+    private static final Gson GSON = new GsonBuilder()
+            .serializeNulls()
+            .setPrettyPrinting()
+            .setFieldNamingPolicy(FieldNamingPolicy.LOWER_CASE_WITH_UNDERSCORES)
+            .create();
+
+    private static JsonObject config = new JsonObject();
+
+    public static void save() {
+        try {
+            generateConfig();
+
+            Files.deleteIfExists(CONFIG_PATH);
+            Files.writeString(CONFIG_PATH, GSON.toJson(config), StandardOpenOption.CREATE_NEW, StandardOpenOption.TRUNCATE_EXISTING);
+        } catch (IOException e) {
+            throw new IllegalStateException("Failed to save config!", e);
+        }
+    }
+
+    public static void load() {
+        if (!Files.exists(CONFIG_PATH)) {
+            save();
+            return;
+        }
+
+        try {
+            applyConfig(GSON.fromJson(Files.readString(CONFIG_PATH), JsonObject.class));
+        } catch (IOException e) {
+            throw new IllegalStateException("Failed to load config!", e);
+        }
+    }
+
+    private static void generateConfig() {
+        JsonObject configCopy = config.deepCopy(); // we use the old config, so we don't lose disconnected controller data
+
+        for (var controller : Controller.CONTROLLERS.values()) {
+            // `add` replaces if already existing
+            configCopy.add(controller.guid(), generateControllerConfig(controller));
+        }
+
+        config = configCopy;
+    }
+
+    private static JsonObject generateControllerConfig(Controller controller) {
+        JsonObject object = new JsonObject();
+
+        object.add("config", GSON.toJsonTree(controller.config()));
+        object.add("bindings", controller.bindings().toJson());
+
+        return object;
+    }
+
+    private static void applyConfig(JsonObject object) {
+        for (var controller : Controller.CONTROLLERS.values()) {
+            var settings = object.getAsJsonObject(controller.guid());
+            if (settings != null) {
+                applyControllerConfig(controller, settings);
+            }
+        }
+    }
+
+    private static void applyControllerConfig(Controller controller, JsonObject object) {
+        controller.config().overwrite(GSON.fromJson(object.getAsJsonObject("config"), ControllerConfig.class));
+        controller.bindings().fromJson(object.getAsJsonObject("bindings"));
+    }
+}