import os
from pathlib import Path

_setup_hint = "You may be able to solve this error by running 'ttfrog setup' or specifying the --root parameter."


def database():
    path = Path(os.environ['DATA_PATH']).expanduser()
    if not path.exists() or not path.is_dir():
        raise RuntimeError(
            f"DATA_PATH {path} doesn't exist or isn't a directory.\n\n{_setup_hint}"
        )
    return path / Path('tabletop-frog.db')


def assets():
    return Path(__file__).parent / 'assets'


def templates():
    try:
        return Path(os.environ['TEMPLATES_PATH'])
    except KeyError:
        return assets() / 'templates'


def static_files():
    try:
        return Path(os.environ['STATIC_FILES_PATH'])
    except KeyError:
        return assets() / 'public'