import importlib.util
import json
import logging
import os
import sys

os.environ["PIP_PYTHON_PATH"] = str(sys.executable)


def _ensure_modules():
    spec = importlib.util.spec_from_file_location(
        "pipenv", location=os.path.join(os.path.dirname(__file__), "__init__.py")
    )
    pipenv = importlib.util.module_from_spec(spec)
    sys.modules["pipenv"] = pipenv
    spec.loader.exec_module(pipenv)


def get_parser():
    from argparse import ArgumentParser

    parser = ArgumentParser("pipenv-resolver")
    parser.add_argument("--pre", action="store_true", default=False)
    parser.add_argument("--clear", action="store_true", default=False)
    parser.add_argument("--verbose", "-v", action="count", default=False)
    parser.add_argument(
        "--category",
        metavar="category",
        action="store",
        default=None,
    )
    parser.add_argument("--debug", action="store_true", default=False)
    parser.add_argument("--system", action="store_true", default=False)
    parser.add_argument("--parse-only", action="store_true", default=False)
    parser.add_argument(
        "--pipenv-site",
        metavar="pipenv_site_dir",
        action="store",
        default=os.environ.get("PIPENV_SITE_DIR"),
    )
    parser.add_argument(
        "--requirements-dir",
        metavar="requirements_dir",
        action="store",
        default=os.environ.get("PIPENV_REQ_DIR"),
    )
    parser.add_argument(
        "--write",
        metavar="write",
        action="store",
        default=os.environ.get("PIPENV_RESOLVER_FILE"),
    )
    parser.add_argument(
        "--constraints-file",
        metavar="constraints_file",
        action="store",
        default=None,
    )
    parser.add_argument("packages", nargs="*")
    return parser


def which(*args, **kwargs):
    return sys.executable


def handle_parsed_args(parsed):
    if "PIPENV_VERBOSITY" in os.environ:
        parsed.verbose = int(os.getenv("PIPENV_VERBOSITY"))
    if parsed.debug:
        parsed.verbose = max(parsed.verbose, 2)
    if parsed.verbose > 1:
        logging.getLogger("pip").setLevel(logging.DEBUG)
    elif parsed.verbose > 0:
        logging.getLogger("pip").setLevel(logging.INFO)
        logger = logging.getLogger(
            "pipenv.patched.pip._internal.resolution.resolvelib.reporter"
        )
        logger.addHandler(logging.StreamHandler())
        logger.setLevel(logging.INFO)
        os.environ["PIP_RESOLVER_DEBUG"] = ""
    os.environ["PIPENV_VERBOSITY"] = str(parsed.verbose)
    if parsed.constraints_file:
        with open(parsed.constraints_file) as constraints:
            file_constraints = constraints.read().strip().split("\n")
        os.unlink(parsed.constraints_file)
        parsed.packages += sorted(file_constraints)
    return parsed


class Entry:
    """A resolved entry from a resolver run"""

    def __init__(
        self, name, entry_dict, project, resolver, reverse_deps=None, category=None
    ):
        super().__init__()
        from pipenv.utils.dependencies import (
            get_lockfile_section_using_pipfile_category,
        )
        from pipenv.vendor.requirementslib.models.utils import tomlkit_value_to_python

        self.name = name
        if isinstance(entry_dict, dict):
            self.entry_dict = self.clean_initial_dict(entry_dict)
        else:
            self.entry_dict = entry_dict
        self.project = project
        self.category = category
        self.lockfile_section = get_lockfile_section_using_pipfile_category(category)
        self.pipfile = tomlkit_value_to_python(project.parsed_pipfile.get(category, {}))
        self.lockfile = project.lockfile_content.get(self.lockfile_section, {})
        self.pipfile_dict = self.pipfile.get(self.pipfile_name, {})
        if self.category != "packages" and self.name in project.lockfile_content.get(
            "default", {}
        ):
            self.lockfile_dict = project.lockfile_content["default"][name]
        else:
            self.lockfile_dict = self.lockfile.get(name, entry_dict)
        self.resolver = resolver
        self.reverse_deps = reverse_deps
        self._original_markers = None
        self._markers = None
        self._entry = None
        self._lockfile_entry = None
        self._pipfile_entry = None
        self._parent_deps = []
        self._flattened_parents = []
        self._requires = None
        self._deptree = None
        self._parents_in_pipfile = []

    @staticmethod
    def make_requirement(name=None, entry=None, from_ireq=False):
        from pipenv.vendor.requirementslib.models.requirements import Requirement

        if from_ireq:
            return Requirement.from_ireq(entry)
        return Requirement.from_pipfile(name, entry)

    @classmethod
    def clean_initial_dict(cls, entry_dict):
        if not entry_dict.get("version", "").startswith("=="):
            entry_dict["version"] = cls.clean_specifier(entry_dict.get("version", ""))
        if "name" in entry_dict:
            del entry_dict["name"]
        return entry_dict

    @classmethod
    def parse_pyparsing_exprs(cls, expr_iterable):
        from pipenv.vendor.pyparsing import Literal, MatchFirst

        keys = []
        expr_list = []
        expr = expr_iterable.copy()
        if isinstance(expr, Literal) or (expr.__class__.__name__ == Literal.__name__):
            keys.append(expr.match)
        elif isinstance(expr, MatchFirst) or (
            expr.__class__.__name__ == MatchFirst.__name__
        ):
            expr_list = expr.exprs
        elif isinstance(expr, list):
            expr_list = expr
        if expr_list:
            for part in expr_list:
                keys.extend(cls.parse_pyparsing_exprs(part))
        return keys

    @classmethod
    def get_markers_from_dict(cls, entry_dict):
        from pipenv.patched.pip._vendor.packaging import markers as packaging_markers
        from pipenv.vendor.requirementslib.models.markers import normalize_marker_str

        marker_keys = cls.parse_pyparsing_exprs(packaging_markers.VARIABLE)
        markers = set()
        keys_in_dict = [k for k in marker_keys if k in entry_dict]
        markers = {normalize_marker_str(f"{k} {entry_dict.pop(k)}") for k in keys_in_dict}
        if "markers" in entry_dict:
            markers.add(normalize_marker_str(entry_dict["markers"]))
        if None in markers:
            markers.remove(None)
        if markers:
            entry_dict["markers"] = " and ".join(list(markers))
        else:
            markers = None
        return markers, entry_dict

    @property
    def markers(self):
        self._markers, self.entry_dict = self.get_markers_from_dict(self.entry_dict)
        return self._markers

    @markers.setter
    def markers(self, markers):
        if not markers:
            marker_str = self.marker_to_str(markers)
            if marker_str:
                self._entry = self.entry.merge_markers(marker_str)
                self._markers = self.marker_to_str(self._entry.markers)
                entry_dict = self.entry_dict.copy()
                entry_dict["markers"] = self.marker_to_str(self._entry.markers)
                self.entry_dict = entry_dict

    @property
    def original_markers(self):
        original_markers, lockfile_dict = self.get_markers_from_dict(self.lockfile_dict)
        self.lockfile_dict = lockfile_dict
        self._original_markers = self.marker_to_str(original_markers)
        return self._original_markers

    @staticmethod
    def marker_to_str(marker):
        from pipenv.vendor.requirementslib.models.markers import normalize_marker_str

        if not marker:
            return None
        from collections.abc import Mapping

        marker_str = None
        if isinstance(marker, Mapping):
            marker_dict, _ = Entry.get_markers_from_dict(marker)
            if marker_dict:
                marker_str = f"{marker_dict.popitem()[1]}"
        elif isinstance(marker, (list, set, tuple)):
            marker_str = " and ".join([normalize_marker_str(m) for m in marker if m])
        elif isinstance(marker, str):
            marker_str = f"{normalize_marker_str(marker)}"
        if isinstance(marker_str, str):
            return marker_str
        return None

    def get_cleaned_dict(self, keep_outdated=False):
        if keep_outdated and self.is_updated:
            self.validate_constraints()
            self.ensure_least_updates_possible()
        elif not keep_outdated:
            self.validate_constraints()
        if self.entry.extras != self.lockfile_entry.extras:
            entry_extras = list(self.entry.extras)
            if self.lockfile_entry.extras:
                entry_extras.extend(list(self.lockfile_entry.extras))
            self._entry.req.extras = entry_extras
            self.entry_dict["extras"] = self.entry.extras
        if self.original_markers and not self.markers:
            original_markers = self.marker_to_str(self.original_markers)
            self.markers = original_markers
            self.entry_dict["markers"] = self.marker_to_str(original_markers)
        entry_hashes = set(self.entry.hashes)
        locked_hashes = set(self.lockfile_entry.hashes)
        if entry_hashes != locked_hashes and not self.is_updated:
            self.entry_dict["hashes"] = sorted(entry_hashes | locked_hashes)
        self.entry_dict["name"] = self.name
        if "version" in self.entry_dict:
            self.entry_dict["version"] = self.strip_version(self.entry_dict["version"])
        _, self.entry_dict = self.get_markers_from_dict(self.entry_dict)
        return self.entry_dict

    @property
    def lockfile_entry(self):
        if self._lockfile_entry is None:
            self._lockfile_entry = self.make_requirement(self.name, self.lockfile_dict)
        return self._lockfile_entry

    @lockfile_entry.setter
    def lockfile_entry(self, entry):
        self._lockfile_entry = entry

    @property
    def pipfile_entry(self):
        if self._pipfile_entry is None:
            self._pipfile_entry = self.make_requirement(
                self.pipfile_name, self.pipfile_dict
            )
        return self._pipfile_entry

    @property
    def entry(self):
        if self._entry is None:
            self._entry = self.make_requirement(self.name, self.entry_dict)
        return self._entry

    @property
    def normalized_name(self):
        return self.entry.normalized_name

    @property
    def pipfile_name(self):
        return self.project.get_package_name_in_pipfile(self.name, category=self.category)

    @property
    def is_in_pipfile(self):
        return True if self.pipfile_name else False

    @property
    def pipfile_packages(self):
        return self.project.pipfile_package_names[self.category]

    def create_parent(self, name, specifier="*"):
        parent = self.create(
            name, specifier, self.project, self.resolver, self.reverse_deps, self.category
        )
        parent._deptree = self.deptree
        return parent

    @property
    def deptree(self):
        if not self._deptree:
            self._deptree = self.project.environment.get_package_requirements()
        return self._deptree

    @classmethod
    def create(
        cls, name, entry_dict, project, resolver, reverse_deps=None, category=None
    ):
        return cls(name, entry_dict, project, resolver, reverse_deps, category)

    @staticmethod
    def clean_specifier(specifier):
        from pipenv.patched.pip._vendor.packaging.specifiers import Specifier

        if not any(specifier.startswith(k) for k in Specifier._operators.keys()):
            if specifier.strip().lower() in ["any", "<any>", "*"]:
                return "*"
            specifier = f"=={specifier}"
        elif specifier.startswith("==") and specifier.count("=") > 3:
            specifier = "=={}".format(specifier.lstrip("="))
        return specifier

    @staticmethod
    def strip_version(specifier):
        from pipenv.patched.pip._vendor.packaging.specifiers import Specifier

        op = next(
            iter(k for k in Specifier._operators.keys() if specifier.startswith(k)), None
        )
        if op:
            specifier = specifier[len(op) :]
        while op:
            op = next(
                iter(k for k in Specifier._operators.keys() if specifier.startswith(k)),
                None,
            )
            if op:
                specifier = specifier[len(op) :]
        return specifier

    @property
    def parent_deps(self):
        if not self._parent_deps:
            self._parent_deps = self.get_parent_deps(unnest=False)
        return self._parent_deps

    @property
    def flattened_parents(self):
        if not self._flattened_parents:
            self._flattened_parents = self.get_parent_deps(unnest=True)
        return self._flattened_parents

    @property
    def parents_in_pipfile(self):
        if not self._parents_in_pipfile:
            self._parents_in_pipfile = [
                p
                for p in self.flattened_parents
                if p.normalized_name in self.pipfile_packages
            ]
        return self._parents_in_pipfile

    @property
    def is_updated(self):
        return self.entry.specifiers != self.lockfile_entry.specifiers

    @property
    def requirements(self):
        if not self._requires:
            self._requires = next(
                iter(self.project.environment.get_package_requirements(self.name)), {}
            )
        return self._requires

    @property
    def updated_version(self):
        version = self.entry.specifiers
        return self.strip_version(version)

    @property
    def updated_specifier(self) -> str:
        return self.entry.specifiers

    @property
    def original_specifier(self) -> str:
        return self.lockfile_entry.specifiers

    @property
    def original_version(self):
        if self.original_specifier:
            return self.strip_version(self.original_specifier)
        return None

    def validate_specifiers(self):
        if self.is_in_pipfile and not self.pipfile_entry.editable:
            return self.pipfile_entry.requirement.specifier.contains(self.updated_version)
        return True

    def get_dependency(self, name):
        if self.requirements:
            return next(
                iter(
                    dep
                    for dep in self.requirements.get("dependencies", [])
                    if dep and dep.get("package_name", "") == name
                ),
                {},
            )
        return {}

    def get_parent_deps(self, unnest=False):
        from pipenv.patched.pip._vendor.packaging.specifiers import Specifier

        parents = []
        for spec in self.reverse_deps.get(self.normalized_name, {}).get("parents", set()):
            spec_match = next(iter(c for c in Specifier._operators if c in spec), None)
            name = spec
            parent = None
            if spec_match is not None:
                spec_index = spec.index(spec_match)
                specifier = self.clean_specifier(
                    spec[spec_index : len(spec_match)]
                ).strip()
                name_start = spec_index + len(spec_match)
                name = spec[name_start:].strip()
                parent = self.create_parent(name, specifier)
            else:
                name = spec
                parent = self.create_parent(name)
            if parent is not None:
                parents.append(parent)
            if not unnest or parent.pipfile_name is not None:
                continue
            if self.reverse_deps.get(parent.normalized_name, {}).get("parents", set()):
                parents.extend(parent.flattened_parents)
        return parents

    def ensure_least_updates_possible(self):
        """
        Mutate the current entry to ensure that we are making the smallest amount of
        changes possible to the existing lockfile -- this will keep the old locked
        versions of packages if they satisfy new constraints.

        :return: None
        """
        constraints = self.get_constraints()
        can_use_original = True
        can_use_updated = True
        satisfied_by_versions = set()
        for constraint in constraints:
            if not constraint.specifier.contains(self.original_version):
                self.can_use_original = False
            if not constraint.specifier.contains(self.updated_version):
                self.can_use_updated = False
            satisfied_by_value = getattr(constraint, "satisfied_by", None)
            if satisfied_by_value:
                satisfied_by = "{}".format(
                    self.clean_specifier(str(satisfied_by_value.version))
                )
                satisfied_by_versions.add(satisfied_by)
        if can_use_original:
            self.entry_dict = self.lockfile_dict.copy()
        elif can_use_updated:
            if len(satisfied_by_versions) == 1:
                self.entry_dict["version"] = next(
                    iter(sat_by for sat_by in satisfied_by_versions if sat_by), None
                )
                hashes = None
                if self.lockfile_entry.specifiers == satisfied_by:
                    ireq = self.lockfile_entry.as_ireq()
                    if (
                        not self.lockfile_entry.hashes
                        and self.resolver._should_include_hash(ireq)
                    ):
                        hashes = self.resolver.get_hash(ireq)
                    else:
                        hashes = self.lockfile_entry.hashes
                else:
                    if self.resolver._should_include_hash(constraint):
                        hashes = self.resolver.get_hash(constraint)
                if hashes:
                    self.entry_dict["hashes"] = list(hashes)
                    self._entry.hashes = frozenset(hashes)
        else:
            # check for any parents, since they depend on this and the current
            # installed versions are not compatible with the new version, so
            # we will need to update the top level dependency if possible
            self.check_flattened_parents()

    def get_constraints(self):
        """
        Retrieve all of the relevant constraints, aggregated from the pipfile, resolver,
        and parent dependencies and their respective conflict resolution where possible.

        :return: A set of **InstallRequirement** instances representing constraints
        :rtype: Set
        """
        constraints = {
            c for c in self.resolver.parsed_constraints if c and c.name == self.entry.name
        }
        pipfile_constraint = self.get_pipfile_constraint()
        if pipfile_constraint and not (
            self.pipfile_entry.editable or pipfile_constraint.editable
        ):
            constraints.add(pipfile_constraint)
        return constraints

    def get_pipfile_constraint(self):
        """
        Retrieve the version constraint from the pipfile if it is specified there,
        otherwise check the constraints of the parent dependencies and their conflicts.

        :return: An **InstallRequirement** instance representing a version constraint
        """
        if self.is_in_pipfile:
            return self.pipfile_entry.as_ireq()

    def validate_constraints(self):
        """
        Retrieves the full set of available constraints and iterate over them, validating
        that they exist and that they are not causing unresolvable conflicts.

        :return: True if the constraints are satisfied by the resolution provided
        :raises: :exc:`pipenv.exceptions.DependencyConflict` if the constraints dont exist
        """
        from pipenv.exceptions import DependencyConflict

        constraints = self.get_constraints()
        pinned_version = self.updated_version
        for constraint in constraints:
            if not constraint.req:
                continue
            if pinned_version and not constraint.req.specifier.contains(
                str(pinned_version), prereleases=True
            ):
                if self.project.s.is_verbose():
                    print(f"Tried constraint: {constraint!r}", file=sys.stderr)
                msg = (
                    "Cannot resolve conflicting version {}{} while {}{} is "
                    "locked.".format(
                        self.name,
                        constraint.req.specifier,
                        self.name,
                        self.updated_specifier,
                    )
                )
                raise DependencyConflict(msg)
        return True

    def check_flattened_parents(self):
        for parent in self.parents_in_pipfile:
            if not parent.updated_specifier:
                continue
            if not parent.validate_specifiers():
                from pipenv.exceptions import DependencyConflict

                msg = (
                    "Cannot resolve conflicting versions: (Root: {}) {}{} (Pipfile) "
                    "Incompatible with {}{} (resolved)\n".format(
                        self.name,
                        parent.pipfile_name,
                        parent.pipfile_entry.requirement.specifiers,
                        parent.name,
                        parent.updated_specifiers,
                    )
                )
                raise DependencyConflict(msg)

    def __getattribute__(self, key):
        result = None
        old_version = ["was_", "had_", "old_"]
        new_version = ["is_", "has_", "new_"]
        if any(key.startswith(v) for v in new_version):
            entry = Entry.__getattribute__(self, "entry")
            try:
                keystart = key.index("_") + 1
                try:
                    result = getattr(entry, key[keystart:])
                except AttributeError:
                    result = getattr(entry, key)
            except AttributeError:
                result = super().__getattribute__(key)
            return result
        if any(key.startswith(v) for v in old_version):
            lockfile_entry = Entry.__getattribute__(self, "lockfile_entry")
            try:
                keystart = key.index("_") + 1
                try:
                    result = getattr(lockfile_entry, key[keystart:])
                except AttributeError:
                    result = getattr(lockfile_entry, key)
            except AttributeError:
                result = super().__getattribute__(key)
            return result
        return super().__getattribute__(key)


def clean_results(results, resolver, project, category):
    from pipenv.utils.dependencies import (
        get_lockfile_section_using_pipfile_category,
        translate_markers,
    )

    if not project.lockfile_exists:
        return results
    lockfile = project.lockfile_content
    lockfile_section = get_lockfile_section_using_pipfile_category(category)
    reverse_deps = project.environment.reverse_dependencies()
    new_results = [
        r for r in results if r["name"] not in lockfile.get(lockfile_section, {})
    ]
    for result in results:
        name = result.get("name")
        entry_dict = result.copy()
        entry = Entry(
            name,
            entry_dict,
            project,
            resolver,
            reverse_deps=reverse_deps,
            category=category,
        )
        entry_dict = translate_markers(entry.get_cleaned_dict(keep_outdated=False))
        new_results.append(entry_dict)
    return new_results


def clean_outdated(results, resolver, project, category):
    from pipenv.utils.dependencies import get_lockfile_section_using_pipfile_category

    if not project.lockfile_exists:
        return results
    lockfile = project.lockfile_content
    lockfile_section = get_lockfile_section_using_pipfile_category(category)
    reverse_deps = project.environment.reverse_dependencies()
    new_results = [r for r in results if r["name"] not in lockfile[lockfile_section]]
    for result in results:
        name = result.get("name")
        entry_dict = result.copy()
        entry = Entry(
            name,
            entry_dict,
            project,
            resolver,
            reverse_deps=reverse_deps,
            category=category,
        )
        # The old entry was editable but this one isnt; prefer the old one
        # TODO: Should this be the case for all locking?
        if entry.was_editable and not entry.is_editable:
            continue
        lockfile_entry = lockfile[lockfile_section].get(name, None)
        if not lockfile_entry:
            if name in lockfile[lockfile_section]:
                lockfile_entry = lockfile[lockfile_section][name]
        if lockfile_entry and not entry.is_updated:
            old_markers = next(
                iter(
                    m
                    for m in (
                        entry.lockfile_entry.markers,
                        lockfile_entry.get("markers", None),
                    )
                    if m is not None
                ),
                None,
            )
            new_markers = entry_dict.get("markers", None)
            if old_markers:
                old_markers = Entry.marker_to_str(old_markers)
            if old_markers and not new_markers:
                entry.markers = old_markers
            elif new_markers and not old_markers:
                del entry.entry_dict["markers"]
                entry._entry.req.req.marker = None
                entry._entry.markers = None
            # if the entry has not changed versions since the previous lock,
            # don't introduce new markers since that is more restrictive
            # if entry.has_markers and not entry.had_markers and not entry.is_updated:
            # do make sure we retain the original markers for entries that are not changed
        entry_dict = entry.get_cleaned_dict(keep_outdated=True)
        new_results.append(entry_dict)
    return new_results


def parse_packages(packages, pre, clear, system, requirements_dir=None):
    from pipenv.utils.indexes import parse_indexes
    from pipenv.vendor.requirementslib.models.requirements import Requirement
    from pipenv.vendor.vistir.contextmanagers import cd, temp_path

    parsed_packages = []
    for package in packages:
        *_, line = parse_indexes(package)
        line = " ".join(line)
        pf = {}
        req = Requirement.from_line(line)
        if not req.name:
            with temp_path(), cd(req.req.setup_info.base_dir):
                sys.path.insert(0, req.req.setup_info.base_dir)
                req.req._setup_info.get_info()
                req.update_name_from_path(req.req.setup_info.base_dir)
        try:
            name, entry = req.pipfile_entry
        except Exception:
            continue
        else:
            if name is not None and entry is not None:
                pf[name] = entry
                parsed_packages.append(pf)
    print("RESULTS:")
    if parsed_packages:
        print(json.dumps(parsed_packages))
    else:
        print(json.dumps([]))


def resolve_packages(
    pre, clear, verbose, system, write, requirements_dir, packages, category
):
    from pipenv.utils.internet import create_mirror_source, replace_pypi_sources
    from pipenv.utils.resolver import resolve_deps

    pypi_mirror_source = (
        create_mirror_source(os.environ["PIPENV_PYPI_MIRROR"])
        if "PIPENV_PYPI_MIRROR" in os.environ
        else None
    )

    def resolve(
        packages, pre, project, sources, clear, system, category, requirements_dir=None
    ):
        return resolve_deps(
            packages,
            which,
            project=project,
            pre=pre,
            category=category,
            sources=sources,
            clear=clear,
            allow_global=system,
            req_dir=requirements_dir,
        )

    from pipenv.project import Project

    project = Project()
    sources = (
        replace_pypi_sources(project.pipfile_sources(), pypi_mirror_source)
        if pypi_mirror_source
        else project.pipfile_sources()
    )
    keep_outdated = os.environ.get("PIPENV_KEEP_OUTDATED", False)
    results, resolver = resolve(
        packages,
        pre=pre,
        category=category,
        project=project,
        sources=sources,
        clear=clear,
        system=system,
        requirements_dir=requirements_dir,
    )
    if keep_outdated:
        results = clean_outdated(results, resolver, project, category)
    else:
        results = clean_results(results, resolver, project, category)
    if write:
        with open(write, "w") as fh:
            if not results:
                json.dump([], fh)
            else:
                json.dump(results, fh)
    else:
        print("RESULTS:")
        if results:
            print(json.dumps(results))
        else:
            print(json.dumps([]))


def _main(
    pre,
    clear,
    verbose,
    system,
    write,
    requirements_dir,
    packages,
    parse_only=False,
    category=None,
):
    os.environ["PIPENV_REQUESTED_PYTHON_VERSION"] = ".".join(
        [str(s) for s in sys.version_info[:3]]
    )
    os.environ["PIP_PYTHON_PATH"] = str(sys.executable)
    if parse_only:
        parse_packages(
            packages,
            pre=pre,
            clear=clear,
            system=system,
            requirements_dir=requirements_dir,
        )
    else:
        resolve_packages(
            pre, clear, verbose, system, write, requirements_dir, packages, category
        )


def main(argv=None):
    parser = get_parser()
    parsed, remaining = parser.parse_known_args(argv)
    _ensure_modules()
    import warnings

    from pipenv.vendor.click.utils import get_text_stream

    warnings.simplefilter("ignore", category=ResourceWarning)
    sys.stdout = get_text_stream("stdout")
    sys.stderr = get_text_stream("stderr")
    os.environ["PIP_DISABLE_PIP_VERSION_CHECK"] = "1"
    os.environ["PYTHONIOENCODING"] = "utf-8"
    os.environ["PYTHONUNBUFFERED"] = "1"
    parsed = handle_parsed_args(parsed)
    _main(
        parsed.pre,
        parsed.clear,
        parsed.verbose,
        parsed.system,
        parsed.write,
        parsed.requirements_dir,
        parsed.packages,
        parse_only=parsed.parse_only,
        category=parsed.category,
    )


if __name__ == "__main__":
    main()
