import re
import sys
import string
import subprocess
import venv
from tempfile import TemporaryDirectory

from path import Path


def remove_all(paths):
    for path in paths:
        path.rmtree() if path.isdir() else path.remove()


def update_vendored():
    update_pkg_resources()
    update_setuptools()


def rewrite_packaging(pkg_files, new_root):
    """
    Rewrite imports in packaging to redirect to vendored copies.
    """
    for file in pkg_files.glob('*.py'):
        text = file.text()
        text = re.sub(r' (pyparsing)', rf' {new_root}.\1', text)
        text = text.replace(
            'from six.moves.urllib import parse',
            'from urllib import parse',
        )
        file.write_text(text)


def rewrite_jaraco_text(pkg_files, new_root):
    """
    Rewrite imports in jaraco.text to redirect to vendored copies.
    """
    for file in pkg_files.glob('*.py'):
        text = file.read_text()
        text = re.sub(r' (jaraco\.)', rf' {new_root}.\1', text)
        text = re.sub(r' (importlib_resources)', rf' {new_root}.\1', text)
        # suppress loading of lorem_ipsum; ref #3072
        text = re.sub(r'^lorem_ipsum.*\n$', '', text, flags=re.M)
        file.write_text(text)


def rewrite_jaraco(pkg_files, new_root):
    """
    Rewrite imports in jaraco.functools to redirect to vendored copies.
    """
    for file in pkg_files.glob('*.py'):
        text = file.read_text()
        text = re.sub(r' (more_itertools)', rf' {new_root}.\1', text)
        file.write_text(text)
    # required for zip-packaged setuptools #3084
    pkg_files.joinpath('__init__.py').write_text('')


def rewrite_importlib_resources(pkg_files, new_root):
    """
    Rewrite imports in importlib_resources to redirect to vendored copies.
    """
    for file in pkg_files.glob('*.py'):
        text = file.read_text().replace('importlib_resources.abc', '.abc')
        text = text.replace('zipp', '..zipp')
        file.write_text(text)


def rewrite_importlib_metadata(pkg_files, new_root):
    """
    Rewrite imports in importlib_metadata to redirect to vendored copies.
    """
    for file in pkg_files.glob('*.py'):
        text = file.read_text().replace('typing_extensions', '..typing_extensions')
        text = text.replace('import zipp', 'from .. import zipp')
        file.write_text(text)


def rewrite_more_itertools(pkg_files: Path):
    """
    Defer import of concurrent.futures. Workaround for #3090.
    """
    more_file = pkg_files.joinpath('more.py')
    text = more_file.read_text()
    text = re.sub(r'^.*concurrent.futures.*?\n', '', text, flags=re.MULTILINE)
    text = re.sub(
        'ThreadPoolExecutor',
        '__import__("concurrent.futures").futures.ThreadPoolExecutor',
        text,
    )
    more_file.write_text(text)


def rewrite_nspektr(pkg_files: Path, new_root):
    for file in pkg_files.glob('*.py'):
        text = file.read_text()
        text = re.sub(r' (more_itertools)', rf' {new_root}.\1', text)
        text = re.sub(r' (jaraco\.\w+)', rf' {new_root}.\1', text)
        text = re.sub(r' (packaging)', rf' {new_root}.\1', text)
        text = re.sub(r' (importlib_metadata)', rf' {new_root}.\1', text)
        file.write_text(text)


def clean(vendor):
    """
    Remove all files out of the vendor directory except the meta
    data (as pip uninstall doesn't support -t).
    """
    remove_all(
        path
        for path in vendor.glob('*')
        if path.basename() != 'vendored.txt'
    )


def install(vendor):
    clean(vendor)
    install_args = [
        sys.executable,
        '-m', 'pip',
        'install',
        '-r', str(vendor / 'vendored.txt'),
        '-t', str(vendor),
    ]
    subprocess.check_call(install_args)
    (vendor / '__init__.py').write_text('')


def update_pkg_resources():
    vendor = Path('pkg_resources/_vendor')
    install(vendor)
    rewrite_packaging(vendor / 'packaging', 'pkg_resources.extern')
    rewrite_jaraco_text(vendor / 'jaraco/text', 'pkg_resources.extern')
    rewrite_jaraco(vendor / 'jaraco', 'pkg_resources.extern')
    rewrite_importlib_resources(vendor / 'importlib_resources', 'pkg_resources.extern')
    rewrite_more_itertools(vendor / "more_itertools")


def update_setuptools():
    vendor = Path('setuptools/_vendor')
    install(vendor)
    install_validate_pyproject(vendor)
    rewrite_packaging(vendor / 'packaging', 'setuptools.extern')
    rewrite_jaraco_text(vendor / 'jaraco/text', 'setuptools.extern')
    rewrite_jaraco(vendor / 'jaraco', 'setuptools.extern')
    rewrite_importlib_resources(vendor / 'importlib_resources', 'setuptools.extern')
    rewrite_importlib_metadata(vendor / 'importlib_metadata', 'setuptools.extern')
    rewrite_more_itertools(vendor / "more_itertools")
    rewrite_nspektr(vendor / "nspektr", 'setuptools.extern')


def install_validate_pyproject(vendor):
    """``validate-pyproject`` can be vendorized to remove all dependencies"""
    req = next(
        (x for x in (vendor / "vendored.txt").lines() if 'validate-pyproject' in x),
        "validate-pyproject[all]"
    )

    pkg, _, _ = req.strip(string.whitespace + "#").partition("#")
    pkg = pkg.strip()

    opts = {}
    if sys.version_info[:2] >= (3, 10):
        opts["ignore_cleanup_errors"] = True

    with TemporaryDirectory(**opts) as tmp:
        env_builder = venv.EnvBuilder(with_pip=True)
        env_builder.create(tmp)
        context = env_builder.ensure_directories(tmp)
        venv_python = getattr(context, 'env_exec_cmd', context.env_exe)

        subprocess.check_call([venv_python, "-m", "pip", "install", pkg])
        cmd = [
            venv_python,
            "-m",
            "validate_pyproject.vendoring",
            f"--output-dir={vendor / '_validate_pyproject' !s}",
            "--enable-plugins",
            "setuptools",
            "distutils",
            "--very-verbose"
        ]
        subprocess.check_call(cmd)


__name__ == '__main__' and update_vendored()