Update GaCy-GO

internal/common/facecam.go

@@ -0,0 +1,56 @@
+package common
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+// FaceCamSettings is shared by the SDK and the game heartbeat. Distance is in
+// world units; changing this setting never changes the Freecam enabled state.
+type FaceCamSettings struct {
+	Mode     string  `json:"mode"`
+	Distance float64 `json:"distance"`
+}
+
+func ReadFaceCamSettings() (FaceCamSettings, error) {
+	settings := FaceCamSettings{Mode: "freecam", Distance: 2}
+	root, err := readCurrencyWarsPersistentRoot()
+	if err != nil {
+		return settings, err
+	}
+	if raw, ok := root["camera_settings"]; ok {
+		if err := json.Unmarshal(raw, &settings); err != nil {
+			return settings, err
+		}
+	}
+	return settings, settings.Validate()
+}
+
+func (s FaceCamSettings) Validate() error {
+	if (s.Mode != "freecam" && s.Mode != "facecam") || !(s.Distance >= 0.5 && s.Distance <= 5) {
+		return fmt.Errorf("invalid camera mode or distance")
+	}
+	return nil
+}
+
+func SaveFaceCamSettings(settings FaceCamSettings) error {
+	if err := settings.Validate(); err != nil {
+		return err
+	}
+	persistentWriteMu.Lock()
+	defer persistentWriteMu.Unlock()
+	unlock, err := lockPersistentFile()
+	if err != nil {
+		return err
+	}
+	defer unlock()
+	root, err := readCurrencyWarsPersistentRoot()
+	if err != nil {
+		return err
+	}
+	root["camera_settings"], err = json.Marshal(settings)
+	if err != nil {
+		return err
+	}
+	return writeJSONAtomic("persistent", root)
+}