From 0beaa71fdc61c4158259f704a9bfd17b9020275b Mon Sep 17 00:00:00 2001
From: Sebastien Lavoie <github@lavoie.sl>
Date: Sun, 29 Mar 2026 08:44:43 -0400
Subject: [PATCH] feat: add DknCloudNaClient stub

---
 custom_components/dkncloudna/api.py | 125 ++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 custom_components/dkncloudna/api.py

diff --git a/custom_components/dkncloudna/api.py b/custom_components/dkncloudna/api.py
new file mode 100644
index 0000000..773defd
--- /dev/null
+++ b/custom_components/dkncloudna/api.py
@@ -0,0 +1,125 @@
+"""DKN Cloud NA API client stub.
+
+Real HTTP calls are implemented in a future phase. This stub defines the
+interface and returns hardcoded data so the rest of the integration can be
+developed and tested without live credentials.
+"""
+
+from __future__ import annotations
+
+from typing import Any
+
+from aiohttp import ClientSession
+
+from .const import LOGGER
+
+
+class DknAuthError(Exception):
+    """Raised when authentication fails (401)."""
+
+
+class DknConnectionError(Exception):
+    """Raised when the API cannot be reached."""
+
+
+class DknCloudNaClient:
+    """Async client for the DKN Cloud NA REST API.
+
+    Instantiated once per config entry. Password is cleared after login and
+    never stored beyond the initial token exchange.
+    """
+
+    def __init__(
+        self,
+        username: str,
+        session: ClientSession,
+        *,
+        password: str | None = None,
+        token: str | None = None,
+        refresh_token: str | None = None,
+    ) -> None:
+        self._username = username
+        self._session = session
+        self._password = password
+        self.token = token
+        self.refresh_token = refresh_token
+
+    def clear_password(self) -> None:
+        """Discard password from memory after token exchange."""
+        self._password = None
+
+    async def login(self) -> None:
+        """Exchange email+password for access and refresh tokens.
+
+        Sets self.token and self.refresh_token on success.
+        Raises DknAuthError on bad credentials, DknConnectionError on network failure.
+        """
+        # TODO: implement real POST to API_LOGIN
+        LOGGER.debug("DknCloudNaClient.login() stub called for %s", self._username)
+        raise NotImplementedError("login() not yet implemented")
+
+    async def is_logged_in(self) -> bool:
+        """Return True if the current token is still valid."""
+        # TODO: implement real GET to API_IS_LOGGED_IN
+        raise NotImplementedError("is_logged_in() not yet implemented")
+
+    async def refresh_access_token(self) -> None:
+        """Use the refresh token to obtain a new access token.
+
+        Updates self.token on success.
+        Raises DknAuthError if the refresh token is also expired.
+        """
+        # TODO: implement real GET to API_REFRESH_TOKEN
+        raise NotImplementedError("refresh_access_token() not yet implemented")
+
+    async def fetch_installations(self) -> list[dict[str, Any]]:
+        """Return all installations and their devices.
+
+        Each installation contains a list of DeviceInfo dicts.
+        Returns stub data for scaffolding.
+        """
+        LOGGER.debug("DknCloudNaClient.fetch_installations() stub — returning fake data")
+        return [
+            {
+                "_id": "stub-installation-1",
+                "name": "My Home",
+                "devices": [
+                    {
+                        "mac": "aa:bb:cc:dd:ee:ff",
+                        "name": "Living Room AC",
+                        "power": False,
+                        "mode": 1,
+                        "real_mode": 1,
+                        "work_temp": 22.0,
+                        "ext_temp": 18.0,
+                        "units": 0,
+                        "setpoint_air_auto": 22.0,
+                        "setpoint_air_cool": 24.0,
+                        "setpoint_air_heat": 20.0,
+                        "range_sp_auto_air_min": 16,
+                        "range_sp_auto_air_max": 32,
+                        "range_sp_cool_air_min": 16,
+                        "range_sp_cool_air_max": 32,
+                        "range_sp_hot_air_min": 16,
+                        "range_sp_hot_air_max": 32,
+                        "speed_state": 0,
+                        "speed_available": [0, 2, 3, 4, 5, 6],
+                        "slats_vertical_1": 0,
+                        "machineready": True,
+                        "isConnected": True,
+                        "tsensor_error": False,
+                        "stat_rssi": -65,
+                        "stat_ssid": "MyWiFi",
+                        "version": "1.0.0",
+                        "error_value": 0,
+                        "error_ascii1": "",
+                        "error_ascii2": "",
+                    }
+                ],
+            }
+        ]
+
+    def __repr__(self) -> str:
+        first = self._username[0] if self._username else "?"
+        token_state = "set" if self.token else "none"
+        return f"DknCloudNaClient(u={first}***, token={token_state})"