import os
from dataclasses import dataclass
from functools import lru_cache

import yaml  # type: ignore


@dataclass(frozen=True)
class DBSettings:
    pg_user: str
    pg_pass: str
    pg_host: str
    pg_port: int
    pg_db: str

    @property
    def db_url(self) -> str:
        return "postgresql+asyncpg://{}:{}@{}:{}/{}".format(
            self.pg_user,
            self.pg_pass,
            self.pg_host,
            self.pg_port,
            self.pg_db,
        )


@dataclass(frozen=True)
class RedisSettings:
    redis_host: str
    redis_port: int


@dataclass(frozen=True)
class Settings:
    db: DBSettings
    redis: RedisSettings


@lru_cache
def get_settings():
    with open(os.getenv("CONFIG_PATH", "./config/api_config.yml")) as f:
        config_data: dict = yaml.safe_load(f)

    return Settings(
        db=DBSettings(**config_data["db"]),
        redis=RedisSettings(**config_data["redis"]),
    )