from functools import lru_cache
from pathlib import Path
from typing import Optional

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


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

    api_id: int = Field(..., alias="TELEGRAM_API_ID")
    api_hash: str = Field(..., alias="TELEGRAM_API_HASH")
    phone_number: Optional[str] = Field(default=None, alias="TELEGRAM_PHONE")
    session_name: str = Field(default="telegram", alias="TELEGRAM_SESSION_NAME")
    session_path: Path = Field(default=Path("data") / "telegram.session", alias="TELEGRAM_SESSION_PATH")
    database_path: Path = Field(default=Path("data") / "hooks.json", alias="DATABASE_PATH")
    base_url: str = Field(default="http://localhost:8000", alias="BASE_URL")
    hook_id_length: int = Field(default=8, alias="HOOK_ID_LENGTH")


@lru_cache
def get_settings() -> Settings:
    settings = Settings()
    settings.session_path.parent.mkdir(parents=True, exist_ok=True)
    settings.database_path.parent.mkdir(parents=True, exist_ok=True)
    return settings