Update GaCy-GO

internal/common/inventory_material_patch.go

@@ -0,0 +1,52 @@
+package common
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+// nil resets an override. Merge only the edited item keys, so a simultaneous
+// game-side gacha grant cannot be erased by an SDK inventory edit.
+func PatchMaterialOverrides(updates map[uint32]*uint32) (map[uint32]uint32, error) {
+	for id := range updates {
+		if id == 0 {
+			return nil, fmt.Errorf("invalid material ID")
+		}
+	}
+	persistentWriteMu.Lock()
+	defer persistentWriteMu.Unlock()
+	unlock, err := lockPersistentFile()
+	if err != nil {
+		return nil, err
+	}
+	defer unlock()
+	raw, err := readResourceFile("freesr-data.json")
+	if err != nil {
+		return nil, err
+	}
+	var root map[string]json.RawMessage
+	if err = json.Unmarshal(raw, &root); err != nil || root == nil {
+		return nil, fmt.Errorf("invalid FreeSR import")
+	}
+	materials := map[uint32]uint32{}
+	if value, exists := root["materials"]; exists {
+		if err = json.Unmarshal(value, &materials); err != nil {
+			return nil, err
+		}
+		if materials == nil {
+			materials = map[uint32]uint32{}
+		}
+	}
+	for id, count := range updates {
+		if count == nil {
+			delete(materials, id)
+		} else {
+			materials[id] = *count
+		}
+	}
+	root["materials"], err = json.Marshal(materials)
+	if err != nil {
+		return nil, err
+	}
+	return materials, writeJSONAtomic("freesr-data.json", root)
+}