import re
import subprocess
import sys
import toml


REGEX_PKG = re.compile("^([\w\.\[\],_-]+)")
REGEX_SINGLE = re.compile("([\w\._-]+)")


def get_pip_freeze_list():
    freeze_text = subprocess.check_output(
        [sys.executable, '-m', 'pip', 'list', '-l', '--format=freeze']
    )
    freeze_text = freeze_text.decode("utf-8")
    return freeze_text.strip().splitlines()

def get_raw_packages_from_pyproject_file(filename="pyproject.toml"):
    pyproject = toml.load(filename)
    _flit = pyproject["tool"]["flit"]["metadata"]
    pyproject_pkgs = _flit["requires"]
    pyproject_pkgs += _flit["requires-extra"]["test"]
    pyproject_pkgs += _flit["requires-extra"]["dev"]
    return pyproject_pkgs


def _parse_package_names(toml_pkgs):
    for pkg in toml_pkgs:
        group = REGEX_PKG.match(pkg)[0]
        yield from REGEX_SINGLE.finditer(group)

def get_package_names(filename="pyproject.toml"):
    toml_pkgs = get_raw_packages_from_pyproject_file(filename)
    as_string = (m.group() for m in _parse_package_names(toml_pkgs))
    lowercased = (item.lower() for item in as_string)
    return {item.replace("_", "-") for item in lowercased}

def filter_toml_pkgs_from_freeze_list(freeze_list, toml_pkgs):
    for line in freeze_list:
        freeze_pkg, _ = line.split("=", 1)
        if freeze_pkg.lower() in toml_pkgs:
            yield line

def main(toml_file="pyproject.toml"):
    freeze_list = get_pip_freeze_list()
    toml_pkgs = get_package_names(toml_file)
    return filter_toml_pkgs_from_freeze_list(freeze_list, toml_pkgs)


if __name__ == "__main__":
    print("\n".join(sorted(main(), key=lambda x: x.lower())))