# Copyright 2010-2025 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

import bz2
import fnmatch
import subprocess
import tempfile
import portage

from itertools import permutations
from portage import os
from portage import shutil
from portage.const import (
    GLOBAL_CONFIG_PATH,
    PORTAGE_BIN_PATH,
    USER_CONFIG_PATH,
    SUPPORTED_GENTOO_BINPKG_FORMATS,
)
from portage.process import find_binary
from portage.dep import Atom, _repo_separator
from portage.dbapi.bintree import binarytree
from portage._sets import load_default_config
from portage._sets.base import InternalPackageSet
from portage.tests import cnf_path
from portage.util import ensure_dirs, normalize_path
from portage.versions import catsplit
from portage.exception import InvalidBinaryPackageFormat
from portage.gpg import GPG

import _emerge
from _emerge.actions import (
    _calc_depclean,
    binpkg_selection_config,
    expand_set_arguments,
)
from _emerge.Blocker import Blocker
from _emerge.create_depgraph_params import create_depgraph_params
from _emerge.DependencyArg import DependencyArg
from _emerge.depgraph import (
    _frozen_depgraph_config,
    backtrack_depgraph,
)
from _emerge.Package import Package
from _emerge.RootConfig import RootConfig


def _combine_repo_config(conf, lines):
    merged = lines.copy()
    for section in reversed(conf):
        header = f"[{section}]"
        if header in merged:
            index = merged.index(header) + 1
            conflicts = [any(l.startswith(k) for l in lines) for k in conf[section]]
            if any(conflicts):
                reserved = ",".join(conf[section].keys())
                raise AssertionError(
                    f"cannot override config attributes [{reserved}] set by ResolverPlayground"
                )
        else:
            merged.insert(0, header)
            index = 1
        for entry in conf[section].items():
            merged.insert(index, ("%s = %s" % entry))
            index += 1
    return merged


class ResolverPlayground:
    """
    This class helps to create the necessary files on disk and
    the needed settings instances, etc. for the resolver to do
    its work.
    """

    config_files = frozenset(
        (
            "eapi",
            "binrepos.conf",
            "layout.conf",
            "make.conf",
            "modules",
            "package.accept_keywords",
            "package.env",
            "package.keywords",
            "package.license",
            "package.mask",
            "package.properties",
            "package.provided",
            "packages",
            "package.unmask",
            "package.use",
            "package.use.force",
            "package.use.mask",
            "package.use.stable",
            "package.use.stable.force",
            "package.use.stable.mask",
            "repos.conf",
            "soname.provided",
            "use.force",
            "use.mask",
            "use.stable",
        )
    )

    metadata_xml_template = """<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
<pkgmetadata>
<maintainer type="person">
<email>maintainer-needed@gentoo.org</email>
<description>Description of the maintainership</description>
</maintainer>
<longdescription>Long description of the package</longdescription>
<use>
%(flags)s
</use>
</pkgmetadata>
"""

    portage_bin = (
        "ebuild",
        "egencache",
        "emerge",
        "emerge-webrsync",
        "emirrordist",
        "glsa-check",
        "portageq",
        "quickpkg",
    )

    portage_sbin = (
        "archive-conf",
        "dispatch-conf",
        "emaint",
        "env-update",
        "etc-update",
        "fixpackages",
        "regenworld",
    )

    def __init__(
        self,
        ebuilds={},
        binpkgs={},
        binrepos={},
        installed={},
        profile={},
        repo_configs={},
        user_config={},
        sets={},
        world=[],
        world_sets=[],
        distfiles={},
        eclasses={},
        eprefix=None,
        targetroot=False,
        debug=False,
    ):
        """
        ebuilds: cpv -> metadata mapping simulating available ebuilds.
        installed: cpv -> metadata mapping simulating installed packages.
                If a metadata key is missing, it gets a default value.
        profile: settings defined by the profile.
        """

        self.debug = debug
        if True:
            if eprefix is None:
                self.eprefix = normalize_path(tempfile.mkdtemp())
            else:
                self.eprefix = normalize_path(eprefix)

            # EPREFIX/bin is used by fake true_binaries. Real binaries goes into EPREFIX/usr/bin
            eubin = os.path.join(self.eprefix, "usr", "bin")
            ensure_dirs(eubin)
            os.symlink(portage._python_interpreter, os.path.join(eubin, "python"))
            for x in self.portage_bin:
                os.symlink(os.path.join(PORTAGE_BIN_PATH, x), os.path.join(eubin, x))

            eusbin = os.path.join(self.eprefix, "usr", "sbin")
            ensure_dirs(eusbin)
            for x in self.portage_sbin:
                os.symlink(os.path.join(PORTAGE_BIN_PATH, x), os.path.join(eusbin, x))

            essential_binaries = (
                "awk",
                "basename",
                "bash",
                "bzip2",
                "cat",
                "chgrp",
                "chmod",
                "chown",
                "comm",
                "cp",
                "egrep",
                "env",
                "find",
                "flock",
                "grep",
                "head",
                "install",
                "ln",
                "mkdir",
                "mkfifo",
                "mktemp",
                "mv",
                "readlink",
                "rm",
                "sed",
                "sort",
                "gtar",
                "tr",
                "uname",
                "uniq",
                "xargs",
                "zstd",
            )
            # Exclude internal wrappers from PATH lookup.
            orig_path = os.environ["PATH"]
            included_paths = []
            for path in orig_path.split(":"):
                if path and not fnmatch.fnmatch(path, "*/portage/*/ebuild-helpers*"):
                    included_paths.append(path)
            try:
                os.environ["PATH"] = ":".join(included_paths)
                for x in essential_binaries:
                    path = find_binary(x)
                    if path is None:
                        raise portage.exception.CommandNotFound(x)
                    os.symlink(path, os.path.join(eubin, x))
            finally:
                os.environ["PATH"] = orig_path

        # Tests may override portage.const.EPREFIX in order to
        # simulate a prefix installation. It's reasonable to do
        # this because tests should be self-contained such that
        # the "real" value of portage.const.EPREFIX is entirely
        # irrelevant (see bug #492932).
        self._orig_eprefix = portage.const.EPREFIX
        portage.const.EPREFIX = self.eprefix.rstrip(os.sep)

        self.eroot = self.eprefix + os.sep
        if targetroot:
            self.target_root = os.path.join(self.eroot, "target_root")
        else:
            self.target_root = os.sep
        self.distdir = os.path.join(self.eroot, "var", "portage", "distfiles")
        self.pkgdir = os.path.join(self.eprefix, "pkgdir")
        self.vdbdir = os.path.join(self.eroot, "var/db/pkg")
        os.makedirs(self.vdbdir)

        if not debug:
            portage.util.noiselimit = -2

        self._repositories = {}
        # Make sure the main repo is always created
        self._get_repo_dir("test_repo")

        self._binrepos = {}
        for binrepo in binrepos:
            self._get_binrepo_dir(binrepo)

        self._create_distfiles(distfiles)
        self._create_ebuilds(ebuilds)
        self._create_installed(installed)
        self._create_profile(
            ebuilds, eclasses, installed, profile, repo_configs, user_config, sets
        )
        self._create_world(world, world_sets)

        self.settings, self.trees = self._load_config()

        self.gpg = None
        self._create_binpkgs(self.pkgdir, binpkgs)
        self._create_ebuild_manifests(ebuilds)

        for binrepo, binpkgs in binrepos.items():
            binrepo_dir = self._get_binrepo_dir(binrepo)
            self._create_binpkgs(binrepo_dir, binpkgs)

        portage.util.noiselimit = 0

    def reload_config(self):
        """
        Reload configuration from disk, which is useful if it has
        been modified after the constructor has been called.
        """
        for eroot in self.trees:
            portdb = self.trees[eroot]["porttree"].dbapi
            portdb.close_caches()
        self.settings, self.trees = self._load_config()

    def _get_repo_dir(self, repo):
        """
        Create the repo directory if needed.
        """
        if repo not in self._repositories:
            if repo == "test_repo":
                self._repositories["DEFAULT"] = {"main-repo": repo}

            repo_path = os.path.join(self.eroot, "var", "repositories", repo)
            self._repositories[repo] = {"location": repo_path}
            profile_path = os.path.join(repo_path, "profiles")

            try:
                os.makedirs(profile_path)
            except OSError:
                pass

            repo_name_file = os.path.join(profile_path, "repo_name")
            with open(repo_name_file, "w") as f:
                f.write(f"{repo}\n")

        return self._repositories[repo]["location"]

    def _get_binrepo_dir(self, binrepo):
        """
        Create the binrepo directory if needed.
        """
        if binrepo not in self._binrepos:
            self._binrepos["DEFAULT"] = {"frozen": "yes"}

            repo_path = os.path.join(self.eroot, "var", "binrepos", binrepo)
            self._binrepos[binrepo] = {"sync-uri": repo_path}

            try:
                os.makedirs(repo_path)
            except OSError:
                pass

        return self._binrepos[binrepo]["sync-uri"]

    def _create_distfiles(self, distfiles):
        os.makedirs(self.distdir)
        for k, v in distfiles.items():
            with open(os.path.join(self.distdir, k), "wb") as f:
                f.write(v)

    def _create_ebuilds(self, ebuilds):
        for cpv in ebuilds:
            a = Atom("=" + cpv, allow_repo=True)
            repo = a.repo
            if repo is None:
                repo = "test_repo"

            metadata = ebuilds[cpv].copy()
            copyright_header = metadata.pop("COPYRIGHT_HEADER", None)
            eapi = metadata.pop("EAPI", "0")
            misc_content = metadata.pop("MISC_CONTENT", None)
            metadata.setdefault("DEPEND", "")
            metadata.setdefault("SLOT", "0")
            metadata.setdefault("KEYWORDS", "x86")
            metadata.setdefault("IUSE", "")

            unknown_keys = set(metadata).difference(portage.dbapi.dbapi._known_keys)
            if unknown_keys:
                raise ValueError(
                    "metadata of ebuild '%s' contains unknown keys: %s"
                    % (cpv, sorted(unknown_keys))
                )

            repo_dir = self._get_repo_dir(repo)
            ebuild_dir = os.path.join(repo_dir, a.cp)
            ebuild_path = os.path.join(ebuild_dir, a.cpv.split("/")[1] + ".ebuild")
            try:
                os.makedirs(ebuild_dir)
            except OSError:
                pass

            with open(ebuild_path, "w") as f:
                if copyright_header is not None:
                    f.write(copyright_header)
                f.write(f'EAPI="{eapi}"\n')
                for k, v in metadata.items():
                    f.write(f'{k}="{v}"\n')
                if misc_content is not None:
                    f.write(misc_content)

    def _create_ebuild_manifests(self, ebuilds):
        for repo_name in self._repositories:
            if repo_name == "DEFAULT":
                continue
            egencache_cmd = [
                "egencache",
                f"--repo={repo_name}",
                "--update",
                "--update-manifests",
                "--sign-manifests=n",
                "--strict-manifests=n",
                f"--repositories-configuration={self.settings['PORTAGE_REPOSITORIES']}",
                f"--jobs={portage.util.cpuinfo.get_cpu_count()}",
            ]
            result = subprocess.run(
                egencache_cmd,
                env=self.settings.environ(),
            )
            if result.returncode != os.EX_OK:
                raise AssertionError(
                    f"command failed with returncode {result.returncode}: {egencache_cmd}"
                )

    def _create_binpkgs(self, repo_dir, binpkgs):
        # When using BUILD_ID, there can be multiple instances for the
        # same cpv. Therefore, binpkgs may be an iterable instead of
        # a dict.
        items = getattr(binpkgs, "items", None)
        items = items() if items is not None else binpkgs
        binpkg_format = self.settings.get(
            "BINPKG_FORMAT", SUPPORTED_GENTOO_BINPKG_FORMATS[0]
        )
        if binpkg_format == "gpkg":
            if self.gpg is None:
                self.gpg = GPG(self.settings)
                self.gpg.unlock()
        for cpv, metadata in items:
            a = Atom("=" + cpv, allow_repo=True)
            repo = a.repo
            if repo is None:
                repo = "test_repo"

            pn = catsplit(a.cp)[1]
            cat, pf = catsplit(a.cpv)
            metadata = metadata.copy()
            metadata.setdefault("SLOT", "0")
            metadata.setdefault("KEYWORDS", "x86")
            metadata.setdefault("BUILD_TIME", "0")
            metadata["repository"] = repo
            metadata["CATEGORY"] = cat
            metadata["PF"] = pf
            metadata["BINPKG_FORMAT"] = binpkg_format

            category_dir = os.path.join(repo_dir, cat)
            if "BUILD_ID" in metadata:
                if binpkg_format == "xpak":
                    binpkg_path = os.path.join(
                        category_dir, pn, f"{pf}-{metadata['BUILD_ID']}.xpak"
                    )
                elif binpkg_format == "gpkg":
                    binpkg_path = os.path.join(
                        category_dir,
                        pn,
                        f"{pf}-{metadata['BUILD_ID']}.gpkg.tar",
                    )
                else:
                    raise InvalidBinaryPackageFormat(binpkg_format)
            else:
                if binpkg_format == "xpak":
                    binpkg_path = os.path.join(category_dir, pf + ".tbz2")
                elif binpkg_format == "gpkg":
                    binpkg_path = os.path.join(category_dir, pf + ".gpkg.tar")
                else:
                    raise InvalidBinaryPackageFormat(binpkg_format)

            ensure_dirs(os.path.dirname(binpkg_path))
            if binpkg_format == "xpak":
                t = portage.xpak.tbz2(binpkg_path)
                t.recompose_mem(portage.xpak.xpak_mem(metadata))
            elif binpkg_format == "gpkg":
                t = portage.gpkg.gpkg(self.settings, a.cpv, binpkg_path)
                t.compress(os.path.dirname(binpkg_path), metadata)
            else:
                raise InvalidBinaryPackageFormat(binpkg_format)

        bintree = binarytree(pkgdir=repo_dir, settings=self.settings)
        bintree.populate(force_reindex=True)

    def _create_installed(self, installed):
        for cpv in installed:
            a = Atom("=" + cpv, allow_repo=True)
            repo = a.repo
            if repo is None:
                repo = "test_repo"

            vdb_pkg_dir = os.path.join(self.vdbdir, a.cpv)
            try:
                os.makedirs(vdb_pkg_dir)
            except OSError:
                pass

            metadata = installed[cpv].copy()
            metadata.setdefault("SLOT", "0")
            metadata.setdefault("BUILD_TIME", "0")
            metadata.setdefault("COUNTER", "0")
            metadata.setdefault("KEYWORDS", "~x86")

            unknown_keys = set(metadata).difference(portage.dbapi.dbapi._known_keys)
            unknown_keys.discard("BUILD_TIME")
            unknown_keys.discard("BUILD_ID")
            unknown_keys.discard("COUNTER")
            unknown_keys.discard("repository")
            unknown_keys.discard("USE")
            unknown_keys.discard("PROVIDES")
            unknown_keys.discard("REQUIRES")
            if unknown_keys:
                raise ValueError(
                    "metadata of installed '%s' contains unknown keys: %s"
                    % (cpv, sorted(unknown_keys))
                )

            metadata["repository"] = repo
            for k, v in metadata.items():
                with open(os.path.join(vdb_pkg_dir, k), "w") as f:
                    f.write(f"{v}\n")

            ebuild_path = os.path.join(vdb_pkg_dir, a.cpv.split("/")[1] + ".ebuild")
            with open(ebuild_path, "w") as f:
                f.write(f"EAPI=\"{metadata.pop('EAPI', '0')}\"\n")
                for k, v in metadata.items():
                    f.write(f'{k}="{v}"\n')

            env_path = os.path.join(vdb_pkg_dir, "environment.bz2")
            with bz2.BZ2File(env_path, mode="w") as f:
                with open(ebuild_path, "rb") as inputfile:
                    f.write(inputfile.read())

    def _create_profile(
        self, ebuilds, eclasses, installed, profile, repo_configs, user_config, sets
    ):
        user_config_dir = os.path.join(self.eroot, USER_CONFIG_PATH)

        try:
            os.makedirs(user_config_dir)
        except OSError:
            pass

        for repo in self._repositories:
            if repo == "DEFAULT":
                continue

            repo_dir = self._get_repo_dir(repo)
            profile_dir = os.path.join(repo_dir, "profiles")
            metadata_dir = os.path.join(repo_dir, "metadata")
            os.makedirs(metadata_dir)

            # Create $REPO/profiles/categories
            categories = set()
            for cpv in ebuilds:
                ebuilds_repo = Atom("=" + cpv, allow_repo=True).repo
                if ebuilds_repo is None:
                    ebuilds_repo = "test_repo"
                if ebuilds_repo == repo:
                    categories.add(catsplit(cpv)[0])

            categories_file = os.path.join(profile_dir, "categories")
            with open(categories_file, "w") as f:
                for cat in categories:
                    f.write(cat + "\n")

            # Create $REPO/profiles/license_groups
            license_file = os.path.join(profile_dir, "license_groups")
            with open(license_file, "w") as f:
                f.write("EULA TEST\n")

            repo_config = repo_configs.get(repo)
            if repo_config:
                for config_file, lines in repo_config.items():
                    if config_file not in self.config_files and not any(
                        fnmatch.fnmatch(config_file, os.path.join(x, "*"))
                        for x in self.config_files
                    ):
                        raise ValueError(f"Unknown config file: '{config_file}'")

                    if config_file in ("layout.conf",):
                        file_name = os.path.join(repo_dir, "metadata", config_file)
                    else:
                        file_name = os.path.join(profile_dir, config_file)
                        if "/" in config_file and not os.path.isdir(
                            os.path.dirname(file_name)
                        ):
                            os.makedirs(os.path.dirname(file_name))
                    with open(file_name, "w") as f:
                        for line in lines:
                            f.write(f"{line}\n")
                        # Temporarily write empty value of masters until it becomes default.
                        # TODO: Delete all references to "# use implicit masters" when empty value becomes default.
                        if config_file == "layout.conf" and not any(
                            line.startswith(("masters =", "# use implicit masters"))
                            for line in lines
                        ):
                            f.write("masters =\n")

            # Create $profile_dir/eclass (we fail to digest the ebuilds if it's not there)
            eclass_dir = os.path.join(repo_dir, "eclass")
            os.makedirs(eclass_dir)

            for eclass_name, eclass_content in eclasses.items():
                with open(os.path.join(eclass_dir, f"{eclass_name}.eclass"), "w") as f:
                    if isinstance(eclass_content, str):
                        eclass_content = [eclass_content]
                    for line in eclass_content:
                        f.write(f"{line}\n")

            # Temporarily write empty value of masters until it becomes default.
            if not repo_config or "layout.conf" not in repo_config:
                layout_conf_path = os.path.join(repo_dir, "metadata", "layout.conf")
                with open(layout_conf_path, "w") as f:
                    f.write("masters =\n")

            if repo == "test_repo":
                # Create a minimal profile in /var/db/repos/gentoo
                sub_profile_dir = os.path.join(
                    profile_dir, "default", "linux", "x86", "test_profile"
                )
                os.makedirs(sub_profile_dir)

                if not (profile and "eapi" in profile):
                    eapi_file = os.path.join(sub_profile_dir, "eapi")
                    with open(eapi_file, "w") as f:
                        f.write("0\n")

                make_defaults_file = os.path.join(sub_profile_dir, "make.defaults")
                with open(make_defaults_file, "w") as f:
                    f.write('ARCH="x86"\n')
                    f.write('ACCEPT_KEYWORDS="x86"\n')

                use_force_file = os.path.join(sub_profile_dir, "use.force")
                with open(use_force_file, "w") as f:
                    f.write("x86\n")

                parent_file = os.path.join(sub_profile_dir, "parent")
                with open(parent_file, "w") as f:
                    f.write("..\n")

                if profile:
                    for config_file, lines in profile.items():
                        if config_file not in self.config_files:
                            raise ValueError(f"Unknown config file: '{config_file}'")

                        file_name = os.path.join(sub_profile_dir, config_file)
                        with open(file_name, "w") as f:
                            for line in lines:
                                f.write(f"{line}\n")

                # Create profile symlink
                os.symlink(
                    sub_profile_dir, os.path.join(user_config_dir, "make.profile")
                )

        gpg_test_path = os.environ["PORTAGE_GNUPGHOME"]

        make_conf = {
            "ACCEPT_KEYWORDS": "x86",
            "BINPKG_GPG_SIGNING_BASE_COMMAND": f"flock {gpg_test_path}/portage-binpkg-gpg.lock /usr/bin/gpg --sign --armor --yes --pinentry-mode loopback --passphrase GentooTest [PORTAGE_CONFIG]",
            "BINPKG_GPG_SIGNING_GPG_HOME": gpg_test_path,
            "BINPKG_GPG_SIGNING_KEY": "0x5D90EA06352177F6",
            "BINPKG_GPG_VERIFY_GPG_HOME": gpg_test_path,
            "CLEAN_DELAY": "0",
            "DISTDIR": self.distdir,
            "EMERGE_WARNING_DELAY": "0",
            "FEATURES": "${FEATURES} binpkg-signing gpg-keepalive",
            "PKGDIR": self.pkgdir,
            "PORTAGE_INST_GID": str(portage.data.portage_gid),
            "PORTAGE_INST_UID": str(portage.data.portage_uid),
            "PORTAGE_TMPDIR": os.path.join(self.eroot, "var/tmp"),
        }

        # Pass along PORTAGE_USERNAME and PORTAGE_GRPNAME since they
        # need to be inherited by ebuild subprocesses.
        if "PORTAGE_USERNAME" in os.environ:
            make_conf["PORTAGE_USERNAME"] = os.environ["PORTAGE_USERNAME"]
        if "PORTAGE_GRPNAME" in os.environ:
            make_conf["PORTAGE_GRPNAME"] = os.environ["PORTAGE_GRPNAME"]

        make_conf_lines = []
        for k_v in make_conf.items():
            make_conf_lines.append('%s="%s"' % k_v)

        if "make.conf" in user_config:
            make_conf_lines.extend(user_config["make.conf"])
            if "BINPKG_FORMAT=gpkg" in user_config["make.conf"]:
                make_conf_lines.append(
                    'FEATURES="${FEATURES} binpkg-request-signature"'
                )

        if not portage.process.sandbox_capable or os.environ.get("SANDBOX_ON") == "1":
            # avoid problems from nested sandbox instances
            make_conf_lines.append('FEATURES="${FEATURES} -sandbox -usersandbox"')

        configs = user_config.copy()
        configs["make.conf"] = make_conf_lines

        repos_conf_lines = list(user_config.get("repos.conf", ()))
        configs["repos.conf"] = _combine_repo_config(
            self._repositories, repos_conf_lines
        )

        if self._binrepos:
            binrepos_conf_lines = list(user_config.get("binrepos.conf", ()))
            configs["binrepos.conf"] = _combine_repo_config(
                self._binrepos, binrepos_conf_lines
            )

        for config_file, lines in configs.items():
            if config_file not in self.config_files:
                raise ValueError(f"Unknown config file: '{config_file}'")

            file_name = os.path.join(user_config_dir, config_file)
            with open(file_name, "w") as f:
                for line in lines:
                    f.write(f"{line}\n")

        # Create /usr/share/portage/config/make.globals
        make_globals_path = os.path.join(
            self.eroot, GLOBAL_CONFIG_PATH.lstrip(os.sep), "make.globals"
        )
        ensure_dirs(os.path.dirname(make_globals_path))
        os.symlink(os.path.join(str(cnf_path), "make.globals"), make_globals_path)

        # Create /usr/share/portage/config/sets/portage.conf
        default_sets_conf_dir = os.path.join(
            self.eroot, "usr/share/portage/config/sets"
        )

        try:
            os.makedirs(default_sets_conf_dir)
        except OSError:
            pass

        provided_sets_portage_conf = os.path.join(str(cnf_path), "sets", "portage.conf")
        os.symlink(
            provided_sets_portage_conf,
            os.path.join(default_sets_conf_dir, "portage.conf"),
        )

        set_config_dir = os.path.join(user_config_dir, "sets")

        try:
            os.makedirs(set_config_dir)
        except OSError:
            pass

        for sets_file, lines in sets.items():
            file_name = os.path.join(set_config_dir, sets_file)
            with open(file_name, "w") as f:
                for line in lines:
                    f.write(f"{line}\n")

    def _create_world(self, world, world_sets):
        # Create /var/lib/portage/world
        var_lib_portage = os.path.join(self.eroot, "var", "lib", "portage")
        os.makedirs(var_lib_portage)

        world_file = os.path.join(var_lib_portage, "world")
        world_set_file = os.path.join(var_lib_portage, "world_sets")

        with open(world_file, "w") as f:
            for atom in world:
                f.write(f"{atom}\n")

        with open(world_set_file, "w") as f:
            for atom in world_sets:
                f.write(f"{atom}\n")

    def _load_config(self):
        create_trees_kwargs = {}
        if self.target_root != os.sep:
            create_trees_kwargs["target_root"] = self.target_root

        path = f"{self.eprefix}/usr/sbin:{self.eprefix}/usr/bin:{os.environ['PATH']}"
        env = {"PATH": path}
        with open(os.path.join(self.eprefix, USER_CONFIG_PATH, "repos.conf")) as f:
            env["PORTAGE_REPOSITORIES"] = f.read()

        if self.debug:
            env["PORTAGE_DEBUG"] = "1"

        trees = portage.create_trees(
            env=env, eprefix=self.eprefix, **create_trees_kwargs
        )

        for root, root_trees in trees.items():
            settings = root_trees["vartree"].settings
            settings._init_dirs()
            setconfig = load_default_config(settings, root_trees)
            root_trees["root_config"] = RootConfig(settings, root_trees, setconfig)

        return trees[trees._target_eroot]["vartree"].settings, trees

    def run(self, atoms, options={}, action=None):
        options = options.copy()
        options["--pretend"] = True
        if self.debug:
            options["--debug"] = True

        if action is None:
            if options.get("--depclean"):
                action = "depclean"
            elif options.get("--prune"):
                action = "prune"

        if options.get("--getbinpkgonly") is True:
            options["--getbinpkg"] = True
            options["--usepkgonly"] = True

        if options.get("--getbinpkg") is True:
            options["--usepkg"] = True

        if options.get("--usepkgonly") is True:
            options["--usepkg"] = True

        binpkg_selection_config(options, self.settings)

        global_noiselimit = portage.util.noiselimit
        global_emergelog_disable = _emerge.emergelog._disable
        try:
            if not self.debug:
                portage.util.noiselimit = -2
            _emerge.emergelog._disable = True

            if self._binrepos:
                self.trees[self.eroot]["bintree"].populate(
                    getbinpkgs=options.get("--getbinpkg", False),
                    getbinpkg_exclude=options.get("--getbinpkg-exclude", None),
                    getbinpkg_include=options.get("--getbinpkg-include", None),
                    pretend=options.get("--pretend", False),
                )

            # NOTE: frozen_config could be cached and reused if options and params were constant.
            params_action = (
                "remove" if action in ("dep_check", "depclean", "prune") else action
            )
            params = create_depgraph_params(options, params_action)
            frozen_config = _frozen_depgraph_config(
                self.settings, self.trees, options, params, None
            )

            atoms, retval = expand_set_arguments(
                atoms, action, self.trees[self.eroot]["root_config"]
            )
            if retval != os.EX_OK:
                raise AssertionError(
                    f"expand_set_arguments failed with retval {retval}"
                )

            if params_action == "remove":
                depclean_result = _calc_depclean(
                    self.settings,
                    self.trees,
                    None,
                    options,
                    action,
                    InternalPackageSet(initial_atoms=atoms, allow_wildcard=True),
                    None,
                    frozen_config=frozen_config,
                )
                result = ResolverPlaygroundDepcleanResult(
                    atoms,
                    depclean_result.returncode,
                    depclean_result.cleanlist,
                    depclean_result.ordered,
                    depclean_result.req_pkg_count,
                    depclean_result.depgraph,
                )
            else:
                success, depgraph, favorites = backtrack_depgraph(
                    self.settings,
                    self.trees,
                    options,
                    params,
                    action,
                    atoms,
                    None,
                    frozen_config=frozen_config,
                )
                depgraph._show_merge_list()
                depgraph.display_problems()
                result = ResolverPlaygroundResult(atoms, success, depgraph, favorites)
        finally:
            portage.util.noiselimit = global_noiselimit
            _emerge.emergelog._disable = global_emergelog_disable

        return result

    def run_TestCase(self, test_case):
        if not isinstance(test_case, ResolverPlaygroundTestCase):
            raise TypeError("ResolverPlayground needs a ResolverPlaygroundTestCase")
        for atoms in test_case.requests:
            result = self.run(atoms, test_case.options, test_case.action)
            if not test_case.compare_with_result(result):
                return

    def cleanup(self):
        if self.gpg is not None:
            self.gpg.stop()
        for eroot in self.trees:
            portdb = self.trees[eroot]["porttree"].dbapi
            portdb.close_caches()
        if self.debug:
            print(f"\nEROOT={self.eroot}")
        else:
            shutil.rmtree(self.eroot)
        if hasattr(self, "_orig_eprefix"):
            portage.const.EPREFIX = self._orig_eprefix


class ResolverPlaygroundTestCase:
    def __init__(self, request, **kwargs):
        self.all_permutations = kwargs.pop("all_permutations", False)
        self.ignore_mergelist_order = kwargs.pop("ignore_mergelist_order", False)
        self.ignore_cleanlist_order = kwargs.pop("ignore_cleanlist_order", False)
        self.ambiguous_merge_order = kwargs.pop("ambiguous_merge_order", False)
        self.ambiguous_slot_collision_solutions = kwargs.pop(
            "ambiguous_slot_collision_solutions", False
        )
        self.check_repo_names = kwargs.pop("check_repo_names", False)
        self.merge_order_assertions = kwargs.pop("merge_order_assertions", False)

        if self.all_permutations:
            self.requests = list(permutations(request))
        else:
            self.requests = [request]

        self.options = kwargs.pop("options", {})
        self.action = kwargs.pop("action", None)
        self.test_success = True
        self.fail_msg = None
        self._checks = kwargs.copy()

    def compare_with_result(self, result):
        checks = dict.fromkeys(result.checks)
        for key, value in self._checks.items():
            if not key in checks:
                raise KeyError(f"Not an available check: '{key}'")
            checks[key] = value

        fail_msgs = []
        for key, value in checks.items():
            got = getattr(result, key)
            expected = value

            if key in result.optional_checks and expected is None:
                continue

            if key == "mergelist":
                if not self.check_repo_names:
                    # Strip repo names if we don't check them
                    if got:
                        new_got = []
                        for cpv in got:
                            if cpv[:1] == "!":
                                new_got.append(cpv)
                                continue
                            new_got.append(cpv.split(_repo_separator)[0])
                        got = new_got
                    if expected:
                        new_expected = []
                        for obj in expected:
                            if isinstance(obj, str):
                                if obj[:1] == "!":
                                    new_expected.append(obj)
                                    continue
                                new_expected.append(obj.split(_repo_separator)[0])
                                continue
                            new_expected.append(set())
                            for cpv in obj:
                                if cpv[:1] != "!":
                                    cpv = cpv.split(_repo_separator)[0]
                                new_expected[-1].add(cpv)
                        expected = new_expected
                if self.ignore_mergelist_order and got is not None:
                    got = set(got)
                    expected = set(expected)

                if self.ambiguous_merge_order and got:
                    expected_stack = list(reversed(expected))
                    got_stack = list(reversed(got))
                    new_expected = []
                    match = True
                    while got_stack and expected_stack:
                        got_token = got_stack.pop()
                        expected_obj = expected_stack.pop()
                        if isinstance(expected_obj, str):
                            new_expected.append(expected_obj)
                            if got_token == expected_obj:
                                continue
                            # result doesn't match, so stop early
                            match = False
                            break
                        expected_obj = set(expected_obj)
                        try:
                            expected_obj.remove(got_token)
                        except KeyError:
                            # result doesn't match, so stop early
                            match = False
                            break
                        new_expected.append(got_token)
                        while got_stack and expected_obj:
                            got_token = got_stack.pop()
                            try:
                                expected_obj.remove(got_token)
                            except KeyError:
                                match = False
                                break
                            new_expected.append(got_token)
                        if not match:
                            # result doesn't match, so stop early
                            break
                        if expected_obj:
                            # result does not match, so stop early
                            match = False
                            new_expected.append(tuple(expected_obj))
                            break
                    if expected_stack:
                        # result does not match, add leftovers to new_expected
                        match = False
                        expected_stack.reverse()
                        new_expected.extend(expected_stack)
                    expected = new_expected

                    if match and self.merge_order_assertions:
                        for node1, node2 in self.merge_order_assertions:
                            if not got.index(node1) < got.index(node2):
                                fail_msgs.append(
                                    "atoms: ("
                                    + ", ".join(result.atoms)
                                    + "), key: "
                                    + (
                                        "merge_order_assertions, expected: %s"
                                        % str((node1, node2))
                                    )
                                    + ", got: "
                                    + str(got)
                                )

            elif key == "cleanlist" and self.ignore_cleanlist_order:
                got = set(got)
                expected = set(expected)

            elif (
                key == "slot_collision_solutions"
                and self.ambiguous_slot_collision_solutions
            ):
                # Tests that use all_permutations can have multiple
                # outcomes here.
                for x in expected:
                    if x == got:
                        expected = x
                        break
            elif (
                key
                in (
                    "unstable_keywords",
                    "needed_p_mask_changes",
                    "unsatisfied_deps",
                    "required_use_unsatisfied",
                )
                and expected is not None
            ):
                # unsatisfied_deps can be a dict for depclean-like actions
                expected = expected if isinstance(expected, dict) else set(expected)

            elif key == "forced_rebuilds" and expected is not None:
                expected = {k: set(v) for k, v in expected.items()}

            if got != expected:
                fail_msgs.append(
                    "atoms: ("
                    + ", ".join(result.atoms)
                    + "), key: "
                    + key
                    + ", expected: "
                    + str(expected)
                    + ", got: "
                    + str(got)
                )
        if fail_msgs:
            self.test_success = False
            self.fail_msg = "\n".join(fail_msgs)
            return False
        return True


def _mergelist_str(x, depgraph):
    if isinstance(x, DependencyArg):
        mergelist_str = x.arg
    elif isinstance(x, Blocker):
        mergelist_str = x.atom
    else:
        repo_str = ""
        if x.repo != "test_repo":
            repo_str = _repo_separator + x.repo
        build_id_str = ""
        if x.type_name == "binary" and x.cpv.build_id is not None:
            build_id_str = f"-{x.cpv.build_id}"
        mergelist_str = x.cpv + build_id_str + repo_str
        if x.built:
            if x.operation == "merge":
                desc = [x.type_name]
            else:
                desc = [x.operation]
            if x.remote:
                desc.append("remote")
            desc = ",".join(desc)
            mergelist_str = f"[{desc}]{mergelist_str}"
        if x.root != depgraph._frozen_config._running_root.root:
            mergelist_str += "{targetroot}"
    return mergelist_str


class ResolverPlaygroundResult:
    checks = (
        "success",
        "mergelist",
        "use_changes",
        "license_changes",
        "unstable_keywords",
        "slot_collision_solutions",
        "circular_dependency_solutions",
        "needed_p_mask_changes",
        "unsatisfied_deps",
        "forced_rebuilds",
        "required_use_unsatisfied",
        "graph_order",
        "virtual_cycle",
    )
    optional_checks = (
        "forced_rebuilds",
        "required_use_unsatisfied",
        "unsatisfied_deps",
        "graph_order",
    )

    def __init__(self, atoms, success, mydepgraph, favorites):
        self.atoms = atoms
        self.success = success
        self.depgraph = mydepgraph
        self.favorites = favorites
        self.mergelist = None
        self.use_changes = None
        self.license_changes = None
        self.unstable_keywords = None
        self.needed_p_mask_changes = None
        self.slot_collision_solutions = None
        self.circular_dependency_solutions = None
        self.unsatisfied_deps = frozenset()
        self.forced_rebuilds = None
        self.required_use_unsatisfied = None
        self.virtual_cycle = None

        self.graph_order = [
            _mergelist_str(node, self.depgraph)
            for node in self.depgraph._dynamic_config.digraph
        ]

        if self.depgraph._dynamic_config._serialized_tasks_cache is not None:
            self.mergelist = []
            for x in self.depgraph._dynamic_config._serialized_tasks_cache:
                self.mergelist.append(_mergelist_str(x, self.depgraph))

        if self.depgraph._dynamic_config._needed_use_config_changes:
            self.use_changes = {}
            for (
                pkg,
                needed_use_config_changes,
            ) in self.depgraph._dynamic_config._needed_use_config_changes.items():
                new_use, changes = needed_use_config_changes
                self.use_changes[pkg.cpv] = changes

        if self.depgraph._dynamic_config._needed_unstable_keywords:
            self.unstable_keywords = set()
            for pkg in self.depgraph._dynamic_config._needed_unstable_keywords:
                self.unstable_keywords.add(pkg.cpv)

        if self.depgraph._dynamic_config._needed_p_mask_changes:
            self.needed_p_mask_changes = set()
            for pkg in self.depgraph._dynamic_config._needed_p_mask_changes:
                self.needed_p_mask_changes.add(pkg.cpv)

        if self.depgraph._dynamic_config._needed_license_changes:
            self.license_changes = {}
            for (
                pkg,
                missing_licenses,
            ) in self.depgraph._dynamic_config._needed_license_changes.items():
                self.license_changes[pkg.cpv] = missing_licenses

        if self.depgraph._dynamic_config._slot_conflict_handler is not None:
            self.slot_collision_solutions = []
            handler = self.depgraph._dynamic_config._slot_conflict_handler

            for change in handler.changes:
                new_change = {}
                for pkg in change:
                    new_change[pkg.cpv] = change[pkg]
                self.slot_collision_solutions.append(new_change)

        if self.depgraph._dynamic_config._circular_dependency_handler is not None:
            handler = self.depgraph._dynamic_config._circular_dependency_handler
            sol = handler.solutions
            self.circular_dependency_solutions = dict(
                zip([x.cpv for x in sol.keys()], sol.values())
            )

        if self.depgraph._dynamic_config._unsatisfied_deps_for_display:
            self.unsatisfied_deps = {
                dep_info[0][1]
                for dep_info in self.depgraph._dynamic_config._unsatisfied_deps_for_display
            }

        if self.depgraph._forced_rebuilds:
            self.forced_rebuilds = {
                child.cpv: {parent.cpv for parent in parents}
                for child_dict in self.depgraph._forced_rebuilds.values()
                for child, parents in child_dict.items()
            }

        required_use_unsatisfied = []
        for (
            pargs,
            kwargs,
        ) in self.depgraph._dynamic_config._unsatisfied_deps_for_display:
            if "show_req_use" in kwargs:
                required_use_unsatisfied.append(pargs[1])
        if required_use_unsatisfied:
            self.required_use_unsatisfied = set(required_use_unsatisfied)

        if self.depgraph._virtual_cycle:
            self.virtual_cycle = {pkg.cpv for pkg in self.depgraph._virtual_cycle}


class ResolverPlaygroundDepcleanResult:
    checks = (
        "success",
        "cleanlist",
        "ordered",
        "req_pkg_count",
        "graph_order",
        "unsatisfied_deps",
    )
    optional_checks = (
        "cleanlist",
        "ordered",
        "req_pkg_count",
        "graph_order",
        "unsatisfied_deps",
    )

    def __init__(self, atoms, rval, cleanlist, ordered, req_pkg_count, depgraph):
        self.atoms = atoms
        self.success = rval == 0
        self.cleanlist = cleanlist
        self.ordered = ordered
        self.req_pkg_count = req_pkg_count
        self.graph_order = [
            _mergelist_str(node, depgraph) for node in depgraph._dynamic_config.digraph
        ]
        self.unsatisfied_deps = {}
        for dep in depgraph._dynamic_config._initially_unsatisfied_deps:
            if isinstance(dep.parent, Package):
                parent_repr = dep.parent.cpv
            else:
                parent_repr = dep.parent.arg
            self.unsatisfied_deps.setdefault(parent_repr, set()).add(dep.atom)
