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box/storage/box_store.py

@@ -0,0 +1,34 @@
+"""Box metadata storage (app-level, within box/data)."""
+
+from __future__ import annotations
+
+import json
+from pathlib import Path
+from typing import Any
+
+from core.identity import generate_box_id
+
+
+class BoxStore:
+    def __init__(self, base_dir: Path) -> None:
+        self._base_dir = base_dir
+        self._path = self._base_dir / "box.json"
+
+    @property
+    def path(self) -> Path:
+        return self._path
+
+    def load(self) -> dict[str, Any]:
+        if not self._path.exists():
+            return {}
+        return json.loads(self._path.read_text(encoding="utf-8"))
+
+    def save(self, data: dict[str, Any]) -> None:
+        self._path.write_text(json.dumps(data, indent=2), encoding="utf-8")
+
+    def ensure_box_id(self) -> str:
+        data = self.load()
+        if "box_id" not in data:
+            data["box_id"] = generate_box_id()
+            self.save(data)
+        return str(data["box_id"])