vendor transformations separated

apps/abstraction/vendors/shelly.py

@@ -0,0 +1,38 @@
+"""Shelly vendor transformations."""
+
+import logging
+from typing import Any
+
+logger = logging.getLogger(__name__)
+
+
+def transform_relay_to_vendor(payload: dict[str, Any]) -> str:
+    """Transform abstract relay payload to Shelly format.
+    
+    Shelly expects plain text 'on' or 'off' (not JSON).
+    
+    Example:
+    - Abstract: {'power': 'on'}
+    - Shelly: 'on'
+    """
+    power = payload.get("power", "off")
+    return power
+
+
+def transform_relay_to_abstract(payload: str) -> dict[str, Any]:
+    """Transform Shelly relay payload to abstract format.
+    
+    Shelly sends plain text 'on' or 'off'.
+    
+    Example:
+    - Shelly: 'on'
+    - Abstract: {'power': 'on'}
+    """
+    return {"power": payload.strip()}
+
+
+# Registry of handlers for this vendor
+HANDLERS = {
+    ("relay", "to_vendor"): transform_relay_to_vendor,
+    ("relay", "to_abstract"): transform_relay_to_abstract,
+}