import os
import streamlit as st

from typing import List


data_dir = os.path.join(os.path.dirname(__file__), '..', 'data')
img_dir = os.path.join(os.path.dirname(__file__), '..', 'img')
config_dir = os.path.join(os.path.dirname(__file__), '..', 'config')


def hf_api_token() -> str:
    """
    Utility single access point to look up the hugging face access token.
    """
    token = st.secrets['hf_token']
    if token is None:
        raise ValueError('No HF access token found in streamlit secrets')
    return token


def join_items_comma_and(items: List[str]) -> str:
    """
    Utility to convert a list of items to lowercase strings, comma separated and ending with and
    """
    items = [str(i).strip() for i in items]
    string_count = len(items)
    if string_count == 0:
        return ""
    if string_count == 1:
        return items[0]
    return f"{', '.join(items[:-1])} and {items[-1]}"


def escape_dollars(text: str) -> str:
    """
    Convenience function to escape dollar signs for prices in markdown
    """
    if text is None:
        return text
    return text.replace("$", "\\$")