"""
All the stuff that needs to run in a subprocess.
"""

from pathlib import Path
from . import utils
from . import bpkg
from . import messages
from .bpkg import exceptions as bpkg_exs
import logging

def download_and_install_package(pipe_to_blender, package: bpkg.Package, install_path: Path):
    """Downloads and installs the given package."""

    log = logging.getLogger(__name__ + '.download_and_install')

    from . import cache
    cache_dir = cache.cache_directory('downloads')

    try:
        package.install(install_path, cache_dir)
    except bpkg_exs.DownloadException as err:
        pipe_to_blender.send(messages.DownloadError(err))
        raise
    except bpkg_exs.InstallException as err:
        pipe_to_blender.send(messages.InstallError(err))
        raise

    pipe_to_blender.send(Success())


def uninstall_package(pipe_to_blender, package: bpkg.Package, install_path: Path):
    """Deletes the given package's files from the install directory"""
    #TODO: move package to cache and present an "undo" button to user, to give nicer UX on misclicks

    for pkgfile in [install_path / Path(p) for p in package.files]:
        if not pkgfile.exists():
            pipe_to_blender.send(messages.UninstallError("Could not find file owned by package: '%s'. Refusing to uninstall." % pkgfile))
            return None

    for pkgfile in [install_path / Path(p) for p in package.files]:
        bpkg.utils.rm(pkgfile)

    pipe_to_blender.send(Success())


def refresh_repository(pipe_to_blender, repo_storage_path: Path, repository_url: str):
    """Retrieves and stores the given repository"""

    log = logging.getLogger(__name__ + '.refresh')
    repository_url = utils.add_repojson_to_url(repository_url)

    repo_path = repo_storage_path / 'repo.json'
    if repo_path.exists():
        repo = bpkg.Repository.from_file(repo_path)
        if repo.url != repository_url:
            # We're getting a new repository
            repo = bpkg.Repository(repository_url)
    else:
        repo = bpkg.Repository(repository_url)

    try:
        repo.refresh()
    except bpkg_exs.DownloadException as err:
        pipe_to_blender.send(messages.DownloadError(err))
        raise
    except bpkg_exs.BadRepositoryException as err:
        pipe_to_blender.send(messages.BadRepositoryError(err))
        raise

    repo.to_file(repo_path) # TODO: this always writes even if repo wasn't changed
    pipe_to_blender.send(messages.RepositoryResult(repo))
    pipe_to_blender.send(messages.Success())