feat: Implement Garmin sync, login improvements, and utility scripts

backend/src/services/garmin_auth_service.py

@@ -0,0 +1,46 @@
+import logging
+import asyncio # Import asyncio for sleep
+from typing import Optional
+
+from garminconnect import Garmin
+from tenacity import retry, stop_after_attempt, wait_exponential, retry_if_exception_type
+
+from ..schemas import GarminCredentials
+
+# Configure debug logging for garminconnect
+logging.basicConfig(level=logging.DEBUG)
+logger = logging.getLogger(__name__)
+
+# Define a retry strategy for Garmin login
+GARMIN_LOGIN_RETRY_STRATEGY = retry(
+    stop=stop_after_attempt(10), # Increased attempts
+    wait=wait_exponential(multiplier=1, min=10, max=60), # Increased min and max wait times
+    retry=retry_if_exception_type(Exception), # Retry on any exception for now
+    reraise=True
+)
+
+class GarminAuthService:
+    def __init__(self):
+        pass
+
+    @GARMIN_LOGIN_RETRY_STRATEGY # Apply retry strategy here
+    async def _perform_login(self, username: str, password: str) -> Garmin:
+        """Helper to perform the actual garminconnect login with retry."""
+        client = Garmin(username, password)
+        client.login()
+        return client
+
+    async def initial_login(self, username: str, password: str) -> Optional[GarminCredentials]:
+        """Performs initial login to Garmin Connect and returns GarminCredentials."""
+        try:
+            client = await self._perform_login(username, password) # Use the retried login helper
+
+            logger.info(f"Successful Garmin login for {username}")
+
+            return GarminCredentials(
+                garmin_username=username,
+                garmin_password_plaintext=password, # Storing plaintext as per user requirement
+            )
+        except Exception as e:
+            logger.error(f"Garmin initial login failed for {username}: {e}")
+            return None