from functools import lru_cache

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")

    telegram_bot_token: str = Field(alias="TELEGRAM_BOT_TOKEN")
    border_status_url: str = Field(
        default="https://gpk.gov.by/situation-at-the-border/",
        alias="BORDER_STATUS_URL",
    )
    ai_base_url: str | None = Field(default=None, alias="AI_BASE_URL")
    ai_api_key: str | None = Field(default=None, alias="AI_API_KEY")
    ai_model: str = Field(default="gpt-5.5", alias="AI_MODEL")
    request_timeout_seconds: float = Field(default=20.0, alias="REQUEST_TIMEOUT_SECONDS")


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