from pydantic_settings import BaseSettings, SettingsConfigDict
from pathlib import Path

# Determina il percorso del file .env (nella root del progetto)
BASE_DIR = Path(__file__).resolve().parent.parent.parent
ENV_FILE = BASE_DIR / ".env"


class Settings(BaseSettings):
    """Configurazione applicazione caricata da variabili d'ambiente"""

    # Database
    DATABASE_URL: str = "postgresql://user:password@localhost:5432/terrain_monitor"

    # JWT
    SECRET_KEY: str
    ALGORITHM: str = "HS256"
    ACCESS_TOKEN_EXPIRE_MINUTES: int = 30

    # MQTT
    MQTT_BROKER_HOST: str = "localhost"
    MQTT_BROKER_PORT: int = 1883
    # Topic pattern: terrain/{cliente_id}/{sito_id}/alarms
    # Wildcards: + (single level), # (multi level)
    MQTT_TOPIC_ALARMS: str = "terrain/+/+/alarms"
    MQTT_TOPIC_TELEMETRY: str = "terrain/+/+/telemetry"  # Dati sensori periodici
    MQTT_TOPIC_STATUS: str = "terrain/+/+/status"  # Stato sensori/gateway
    MQTT_USERNAME: str = ""
    MQTT_PASSWORD: str = ""

    # Firebase
    FIREBASE_CREDENTIALS_PATH: str = "./firebase-credentials.json"

    # Application
    DEBUG: bool = False
    APP_NAME: str = "Terrain Monitor API"

    model_config = SettingsConfigDict(
        env_file=str(ENV_FILE),
        env_file_encoding='utf-8'
    )


settings = Settings()