from functools import lru_cache
from pathlib import Path

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    model_config = SettingsConfigDict(env_file=".env", env_file_encoding="utf-8", extra="ignore")

    app_name: str = "RF Propagation API"
    api_v1_prefix: str = "/api/v1"
    database_url: str = "postgresql+psycopg://radio:radio@postgis:5432/radio"
    redis_url: str = "redis://redis:6379/0"
    dem_path: Path = Field(default=Path("/data/dem"))
    landcover_path: Path = Field(default=Path("/data/landcover"))
    canopy_path: Path = Field(default=Path("/data/canopy"))
    buildings_query_limit: int = Field(default=5000, gt=0)
    p833_gamma_db_per_m: float = Field(default=0.15, ge=0)
    p833_max_attenuation_db: float = Field(default=25.0, gt=0)


@lru_cache
def get_settings() -> Settings:
    return Settings()