import os
from pathlib import Path
from typing import Optional, Union

HERE = Path(__file__).parent

# Get directory of langchain package
PACKAGE_DIR = HERE.parent
SEPARATOR = os.sep


def get_relative_path(
    file: Union[Path, str], *, relative_to: Path = PACKAGE_DIR
) -> str:
    """Get the path of the file as a relative path to the package directory."""
    if isinstance(file, str):
        file = Path(file)
    return str(file.relative_to(relative_to))


def as_import_path(
    file: Union[Path, str],
    *,
    suffix: Optional[str] = None,
    relative_to: Path = PACKAGE_DIR,
) -> str:
    """Path of the file as a LangChain import exclude langchain top namespace."""
    if isinstance(file, str):
        file = Path(file)
    path = get_relative_path(file, relative_to=relative_to)
    if file.is_file():
        path = path[: -len(file.suffix)]
    import_path = path.replace(SEPARATOR, ".")
    if suffix:
        import_path += "." + suffix
    return import_path