"""
Central configuration for the Garmin Health Lab Flask backend.

Reads settings from a `.env` file (backend/.env) and the process environment.
The same code runs against SQLite (local dev) or MariaDB (NAS production)
by switching DB_TYPE — business code never branches on the backend.
"""
import os

from dotenv import load_dotenv

# Load .env from the backend directory (falls back to cwd / parent search).
_BACKEND_DIR = os.path.dirname(os.path.abspath(__file__))
_ENV_PATH = os.path.join(_BACKEND_DIR, ".env")
if os.path.exists(_ENV_PATH):
    load_dotenv(_ENV_PATH)
else:
    load_dotenv()  # walk up from cwd

# --- Database selection -----------------------------------------------------
DB_TYPE = (os.environ.get("DB_TYPE") or "sqlite").lower()

# SQLite (default, zero-config local development)
SQLITE_PATH = os.environ.get("DATABASE_PATH") or os.path.join(
    _BACKEND_DIR, "data", "health.db"
)

# MariaDB (production, runs on the NAS)
MARIADB_SOCKET = os.environ.get("MARIADB_SOCKET") or ""
MARIADB_HOST = os.environ.get("MARIADB_HOST") or "127.0.0.1"
MARIADB_PORT = int(os.environ.get("MARIADB_PORT") or 3306)
MARIADB_USER = os.environ.get("MARIADB_USER") or "root"
MARIADB_PASSWORD = os.environ.get("MARIADB_PASSWORD") or ""
MARIADB_DATABASE = os.environ.get("MARIADB_DATABASE") or "garmin_health_lab"

# --- Auth -------------------------------------------------------------------
JWT_SECRET = os.environ.get("JWT_SECRET") or "dev_secret_change_me"
JWT_EXPIRY_DAYS = int(os.environ.get("JWT_EXPIRY_DAYS") or 7)

# Who may create an account.
#   "auto"  - only while no user exists yet (first-run setup, then closed).
#   "true"  - always open.
#   "false" - never; accounts must be created out of band.
# "auto" is the default because this deployment is reachable from the public
# internet, where an open registration endpoint would let anyone create an
# account and start pulling health data.
ALLOW_REGISTRATION = (os.environ.get("ALLOW_REGISTRATION") or "auto").lower()

# --- Static UI --------------------------------------------------------------
# Directory holding the built React app. When set and populated, the Flask
# process serves the UI too, so a deployment is one port and one service.
STATIC_DIR = os.environ.get("STATIC_DIR") or os.path.join(_BACKEND_DIR, "static")

# --- Server -----------------------------------------------------------------
# BACKEND_PORT wins over PORT: `PORT` is set by many dev tools and PaaS
# runtimes for the *frontend*, and letting it through made Flask seize the
# React dev server's port during `npm run dev`.
PORT = int(os.environ.get("BACKEND_PORT") or os.environ.get("PORT") or 5000)

# Comma-separated list of allowed front-end origins (CORS).
_CORS_RAW = os.environ.get("CORS_ORIGIN") or "http://localhost:3000,http://localhost:5173"
CORS_ORIGINS = [o.strip() for o in _CORS_RAW.split(",") if o.strip()]