UI updates

python_app/orchestration/gui_session_state.py

@@ -0,0 +1,52 @@
+"""Persistent session-state helpers for GUI-only runtime preferences."""
+
+from __future__ import annotations
+
+from dataclasses import dataclass
+import json
+from pathlib import Path
+
+
+@dataclass(slots=True)
+class GuiSessionState:
+    """Small persisted GUI session state."""
+
+    last_profile_path: str = ""
+
+
+class GuiSessionStateStore:
+    """Atomic JSON store for GUI session-state file."""
+
+    def __init__(self, path: Path) -> None:
+        """Create store targeting `path`."""
+        self._path = path
+        self._path.parent.mkdir(parents=True, exist_ok=True)
+
+    @property
+    def path(self) -> Path:
+        """Return backing session-state file path."""
+        return self._path
+
+    def load(self) -> GuiSessionState:
+        """Load session-state from disk or return empty defaults when missing."""
+        if not self._path.exists():
+            return GuiSessionState()
+
+        payload = json.loads(self._path.read_text(encoding="utf-8"))
+        if not isinstance(payload, dict):
+            raise ValueError(f"GUI session-state root must be JSON object: {self._path}")
+
+        raw_path = payload.get("last_profile_path", "")
+        if not isinstance(raw_path, str):
+            raise ValueError("GUI session-state `last_profile_path` must be a string")
+        return GuiSessionState(last_profile_path=raw_path)
+
+    def write(self, state: GuiSessionState) -> Path:
+        """Atomically write session-state JSON file."""
+        temp_path = self._path.with_suffix(self._path.suffix + ".tmp")
+        temp_path.write_text(
+            json.dumps({"last_profile_path": state.last_profile_path}, indent=2),
+            encoding="utf-8",
+        )
+        temp_path.replace(self._path)
+        return self._path