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from typing import List, Optional

from .base import BaseDistribution, BaseEnvironment, FilesystemWheel, MemoryWheel, Wheel

__all__ = [
    "BaseDistribution",
    "BaseEnvironment",
    "FilesystemWheel",
    "MemoryWheel",
    "Wheel",
    "get_default_environment",
    "get_environment",
    "get_wheel_distribution",
]


def get_default_environment() -> BaseEnvironment:
    """Get the default representation for the current environment.

    This returns an Environment instance from the chosen backend. The default
    Environment instance should be built from ``sys.path`` and may use caching
    to share instance state accorss calls.
    """
    from .pkg_resources import Environment

    return Environment.default()


def get_environment(paths: Optional[List[str]]) -> BaseEnvironment:
    """Get a representation of the environment specified by ``paths``.

    This returns an Environment instance from the chosen backend based on the
    given import paths. The backend must build a fresh instance representing
    the state of installed distributions when this function is called.
    """
    from .pkg_resources import Environment

    return Environment.from_paths(paths)


def get_wheel_distribution(wheel: Wheel, canonical_name: str) -> BaseDistribution:
    """Get the representation of the specified wheel's distribution metadata.

    This returns a Distribution instance from the chosen backend based on
    the given wheel's ``.dist-info`` directory.

    :param canonical_name: Normalized project name of the given wheel.
    """
    from .pkg_resources import Distribution

    return Distribution.from_wheel(wheel, canonical_name)