# Copyright (C) 2012 Anaconda, Inc
# SPDX-License-Identifier: BSD-3-Clause

from __future__ import annotations

import collections
import functools
import json
import pathlib
from tempfile import TemporaryDirectory

import pytest

from ..exceptions import PackagesNotFoundError, ResolvePackageNotFound, UnsatisfiableError
from ..base.context import context
from ..core.solve import Solver
from ..models.channel import Channel
from ..models.records import PackageRecord
from ..models.match_spec import MatchSpec
from . import helpers


@functools.lru_cache()
def index_packages(num):
    """Get the index data of the ``helpers.get_index_r_*`` helpers."""
    # XXX: get_index_r_X should probably be refactored to avoid loading the environment like this.
    get_index = getattr(helpers, f"get_index_r_{num}")
    index, _ = get_index(context.subdir)
    return list(index.values())


def package_string(record):
    return f"{record.channel.name}::{record.name}-{record.version}-{record.build}"


def package_string_set(packages):
    """Transforms package container in package string set."""
    return {package_string(record) for record in packages}


def package_dict(packages):
    """Transforms package container into a dictionary."""
    return {record.name: record for record in packages}


class SimpleEnvironment:
    """Helper environment object."""

    REPO_DATA_KEYS = (
        "build",
        "build_number",
        "depends",
        "license",
        "md5",
        "name",
        "sha256",
        "size",
        "subdir",
        "timestamp",
        "version",
        "track_features",
        "features",
    )

    def __init__(self, path, solver_class, subdirs=context.subdirs):
        self._path = pathlib.Path(path)
        self._prefix_path = self._path / "prefix"
        self._channels_path = self._path / "channels"
        self._solver_class = solver_class
        self.subdirs = subdirs
        self.installed_packages = []
        # if repo_packages is a list, the packages will be put in a `test` channel
        # if it is a dictionary, it the keys are the channel name and the value
        # the channel packages
        self.repo_packages: list[str] | dict[str, list[str]] = []

    def solver(self, add, remove):
        """Writes ``repo_packages`` to the disk and creates a solver instance."""
        channels = []
        self._write_installed_packages()
        for channel_name, packages in self._channel_packages.items():
            self._write_repo_packages(channel_name, packages)
            channel = Channel(str(self._channels_path / channel_name))
            channels.append(channel)
        return self._solver_class(
            prefix=self._prefix_path,
            subdirs=self.subdirs,
            channels=channels,
            specs_to_add=add,
            specs_to_remove=remove,
        )

    def solver_transaction(self, add=(), remove=(), as_specs=False):
        packages = self.solver(add=add, remove=remove).solve_final_state()
        if as_specs:
            return packages
        return package_string_set(packages)

    def install(self, *specs, as_specs=False):
        return self.solver_transaction(add=specs, as_specs=as_specs)

    def remove(self, *specs, as_specs=False):
        return self.solver_transaction(remove=specs, as_specs=as_specs)

    @property
    def _channel_packages(self):
        """Helper that unfolds the ``repo_packages`` into a dictionary."""
        if isinstance(self.repo_packages, dict):
            return self.repo_packages
        return {"test": self.repo_packages}

    def _package_data(self, record):
        """Turn record into data, to be written in the JSON environment/repo files."""
        data = {key: value for key, value in vars(record).items() if key in self.REPO_DATA_KEYS}
        if "subdir" not in data:
            data["subdir"] = context.subdir
        return data

    def _write_installed_packages(self):
        if not self.installed_packages:
            return
        conda_meta = self._prefix_path / "conda-meta"
        conda_meta.mkdir(exist_ok=True, parents=True)
        # write record files
        for record in self.installed_packages:
            record_path = conda_meta / f"{record.name}-{record.version}-{record.build}.json"
            record_data = self._package_data(record)
            record_data["channel"] = record.channel.name
            record_path.write_text(json.dumps(record_data))
        # write history file
        history_path = conda_meta / "history"
        history_path.write_text(
            "\n".join(
                (
                    "==> 2000-01-01 00:00:00 <==",
                    *map(package_string, self.installed_packages),
                )
            )
        )

    def _write_repo_packages(self, channel_name, packages):
        """Write packages to the channel path."""
        # build package data
        package_data = collections.defaultdict(dict)
        for record in packages:
            package_data[record.subdir][record.fn] = self._package_data(record)
        # write repodata
        assert set(self.subdirs).issuperset(set(package_data.keys()))
        for subdir in self.subdirs:
            subdir_path = self._channels_path / channel_name / subdir
            subdir_path.mkdir(parents=True, exist_ok=True)
            subdir_path.joinpath("repodata.json").write_text(
                json.dumps(
                    {
                        "info": {
                            "subdir": subdir,
                        },
                        "packages": package_data.get(subdir, {}),
                    }
                )
            )


def empty_prefix():
    return TemporaryDirectory(prefix="conda-test-repo-")


@pytest.fixture()
def temp_simple_env(solver_class=Solver) -> SimpleEnvironment:
    with empty_prefix() as prefix:
        yield SimpleEnvironment(prefix, solver_class)


class SolverTests:
    """Tests for :py:class:`conda.core.solve.Solver` implementations."""

    @property
    def solver_class(self) -> Type[Solver]:
        """Class under test."""
        raise NotImplementedError

    @property
    def tests_to_skip(self):
        return {}  # skip reason -> list of tests to skip

    @pytest.fixture(autouse=True)
    def skip_tests(self, request):
        for reason, skip_list in self.tests_to_skip.items():
            if request.node.name in skip_list:
                pytest.skip(reason)

    @pytest.fixture()
    def env(self):
        with TemporaryDirectory(prefix="conda-test-repo-") as tmpdir:
            self.env = SimpleEnvironment(tmpdir, self.solver_class)
            yield self.env
            self.env = None

    def find_package_in_list(self, packages, **kwargs):
        for record in packages:
            if all(getattr(record, key) == value for key, value in kwargs.items()):
                return record

    def find_package(self, **kwargs):
        if isinstance(self.env.repo_packages, dict):
            if "channel" not in kwargs:
                raise ValueError(
                    "Repo has multiple channels, the `channel` argument must be specified"
                )
            packages = self.env.repo_packages[kwargs["channel"]]
        else:
            packages = self.env.repo_packages
        return self.find_package_in_list(packages, **kwargs)

    def assert_unsatisfiable(self, exc_info, entries):
        """Helper to assert that a :py:class:`conda.exceptions.UnsatisfiableError`
        instance as a the specified set of unsatisfiable specifications."""
        assert issubclass(exc_info.type, UnsatisfiableError)
        if exc_info.type is UnsatisfiableError:
            assert (
                sorted(tuple(map(str, entries)) for entries in exc_info.value.unsatisfiable)
                == entries
            )

    def test_empty(self, env):
        env.repo_packages = index_packages(1)
        assert env.install() == set()

    def test_iopro_mkl(self, env):
        env.repo_packages = index_packages(1)
        assert env.install("iopro 1.4*", "python 2.7*", "numpy 1.7*") == {
            "test::iopro-1.4.3-np17py27_p0",
            "test::numpy-1.7.1-py27_0",
            "test::openssl-1.0.1c-0",
            "test::python-2.7.5-0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::unixodbc-2.3.1-0",
            "test::zlib-1.2.7-0",
            "test::distribute-0.6.36-py27_1",
            "test::pip-1.3.1-py27_1",
        }

    def test_iopro_nomkl(self, env):
        env.repo_packages = index_packages(1)
        assert env.install(
            "iopro 1.4*", "python 2.7*", "numpy 1.7*", MatchSpec(track_features="mkl")
        ) == {
            "test::iopro-1.4.3-np17py27_p0",
            "test::mkl-rt-11.0-p0",
            "test::numpy-1.7.1-py27_p0",
            "test::openssl-1.0.1c-0",
            "test::python-2.7.5-0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::unixodbc-2.3.1-0",
            "test::zlib-1.2.7-0",
            "test::distribute-0.6.36-py27_1",
            "test::pip-1.3.1-py27_1",
        }

    def test_mkl(self, env):
        env.repo_packages = index_packages(1)
        assert env.install("mkl") == env.install("mkl 11*", MatchSpec(track_features="mkl"))

    def test_accelerate(self, env):
        env.repo_packages = index_packages(1)
        assert env.install("accelerate") == env.install(
            "accelerate", MatchSpec(track_features="mkl")
        )

    def test_scipy_mkl(self, env):
        env.repo_packages = index_packages(1)
        records = env.install(
            "scipy",
            "python 2.7*",
            "numpy 1.7*",
            MatchSpec(track_features="mkl"),
            as_specs=True,
        )

        for record in records:
            if record.name in ("numpy", "scipy"):
                assert "mkl" in record.features

        assert "test::numpy-1.7.1-py27_p0" in package_string_set(records)
        assert "test::scipy-0.12.0-np17py27_p0" in package_string_set(records)

    def test_anaconda_nomkl(self, env):
        env.repo_packages = index_packages(1)
        records = env.install("anaconda 1.5.0", "python 2.7*", "numpy 1.7*")
        assert len(records) == 107
        assert "test::scipy-0.12.0-np17py27_0" in records

    def test_pseudo_boolean(self, env):
        env.repo_packages = index_packages(1)
        # The latest version of iopro, 1.5.0, was not built against numpy 1.5
        assert env.install("iopro", "python 2.7*", "numpy 1.5*") == {
            "test::iopro-1.4.3-np15py27_p0",
            "test::numpy-1.5.1-py27_4",
            "test::openssl-1.0.1c-0",
            "test::python-2.7.5-0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::unixodbc-2.3.1-0",
            "test::zlib-1.2.7-0",
            "test::distribute-0.6.36-py27_1",
            "test::pip-1.3.1-py27_1",
        }
        assert env.install(
            "iopro", "python 2.7*", "numpy 1.5*", MatchSpec(track_features="mkl")
        ) == {
            "test::iopro-1.4.3-np15py27_p0",
            "test::mkl-rt-11.0-p0",
            "test::numpy-1.5.1-py27_p4",
            "test::openssl-1.0.1c-0",
            "test::python-2.7.5-0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::unixodbc-2.3.1-0",
            "test::zlib-1.2.7-0",
            "test::distribute-0.6.36-py27_1",
            "test::pip-1.3.1-py27_1",
        }

    def test_unsat_from_r1(self, env):
        env.repo_packages = index_packages(1)

        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("numpy 1.5*", "scipy 0.12.0b1")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("numpy=1.5",),
                ("scipy==0.12.0b1", "numpy[version='1.6.*|1.7.*']"),
            ],
        )

        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("numpy 1.5*", "python 3*")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("numpy=1.5", "nose", "python=3.3"),
                ("numpy=1.5", "python[version='2.6.*|2.7.*']"),
                ("python=3",),
            ],
        )

        with pytest.raises((ResolvePackageNotFound, PackagesNotFoundError)) as exc_info:
            env.install("numpy 1.5*", "numpy 1.6*")
        if exc_info.type is ResolvePackageNotFound:
            assert sorted(map(str, exc_info.value.bad_deps)) == [
                "numpy[version='1.5.*,1.6.*']",
            ]

    def test_unsat_simple(self, env):
        env.repo_packages = [
            helpers.record(name="a", depends=["c >=1,<2"]),
            helpers.record(name="b", depends=["c >=2,<3"]),
            helpers.record(name="c", version="1.0"),
            helpers.record(name="c", version="2.0"),
        ]
        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("a", "b")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("a", "c[version='>=1,<2']"),
                ("b", "c[version='>=2,<3']"),
            ],
        )

    def test_get_dists(self, env):
        env.repo_packages = index_packages(1)
        records = env.install("anaconda 1.4.0")
        assert "test::anaconda-1.4.0-np17py33_0" in records
        assert "test::freetype-2.4.10-0" in records

    def test_unsat_shortest_chain_1(self, env):
        env.repo_packages = [
            helpers.record(name="a", depends=["d", "c <1.3.0"]),
            helpers.record(name="b", depends=["c"]),
            helpers.record(
                name="c",
                version="1.3.6",
            ),
            helpers.record(
                name="c",
                version="1.2.8",
            ),
            helpers.record(name="d", depends=["c >=0.8.0"]),
        ]
        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("c=1.3.6", "a", "b")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("a", "c[version='<1.3.0']"),
                ("a", "d", "c[version='>=0.8.0']"),
                ("b", "c"),
                ("c=1.3.6",),
            ],
        )

    def test_unsat_shortest_chain_2(self, env):
        env.repo_packages = [
            helpers.record(name="a", depends=["d", "c >=0.8.0"]),
            helpers.record(name="b", depends=["c"]),
            helpers.record(
                name="c",
                version="1.3.6",
            ),
            helpers.record(
                name="c",
                version="1.2.8",
            ),
            helpers.record(name="d", depends=["c <1.3.0"]),
        ]
        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("c=1.3.6", "a", "b")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("a", "c[version='>=0.8.0']"),
                ("a", "d", "c[version='<1.3.0']"),
                ("b", "c"),
                ("c=1.3.6",),
            ],
        )

    def test_unsat_shortest_chain_3(self, env):
        env.repo_packages = [
            helpers.record(name="a", depends=["f", "e"]),
            helpers.record(name="b", depends=["c"]),
            helpers.record(
                name="c",
                version="1.3.6",
            ),
            helpers.record(
                name="c",
                version="1.2.8",
            ),
            helpers.record(name="d", depends=["c >=0.8.0"]),
            helpers.record(name="e", depends=["c <1.3.0"]),
            helpers.record(name="f", depends=["d"]),
        ]
        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("c=1.3.6", "a", "b")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("a", "e", "c[version='<1.3.0']"),
                ("b", "c"),
                ("c=1.3.6",),
            ],
        )

    def test_unsat_shortest_chain_4(self, env):
        env.repo_packages = [
            helpers.record(name="a", depends=["py =3.7.1"]),
            helpers.record(name="py_req_1"),
            helpers.record(name="py_req_2"),
            helpers.record(name="py", version="3.7.1", depends=["py_req_1", "py_req_2"]),
            helpers.record(name="py", version="3.6.1", depends=["py_req_1", "py_req_2"]),
        ]
        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("a", "py=3.6.1")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("a", "py=3.7.1"),
                ("py=3.6.1",),
            ],
        )

    def test_unsat_chain(self, env):
        # a -> b -> c=1.x -> d=1.x
        # e      -> c=2.x -> d=2.x
        env.repo_packages = [
            helpers.record(name="a", depends=["b"]),
            helpers.record(name="b", depends=["c >=1,<2"]),
            helpers.record(name="c", version="1.0", depends=["d >=1,<2"]),
            helpers.record(name="d", version="1.0"),
            helpers.record(name="e", depends=["c >=2,<3"]),
            helpers.record(name="c", version="2.0", depends=["d >=2,<3"]),
            helpers.record(name="d", version="2.0"),
        ]
        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("a", "e")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("a", "b", "c[version='>=1,<2']"),
                ("e", "c[version='>=2,<3']"),
            ],
        )

    def test_unsat_any_two_not_three(self, env):
        # can install any two of a, b and c but not all three
        env.repo_packages = [
            helpers.record(name="a", version="1.0", depends=["d >=1,<2"]),
            helpers.record(name="a", version="2.0", depends=["d >=2,<3"]),
            helpers.record(name="b", version="1.0", depends=["d >=1,<2"]),
            helpers.record(name="b", version="2.0", depends=["d >=3,<4"]),
            helpers.record(name="c", version="1.0", depends=["d >=2,<3"]),
            helpers.record(name="c", version="2.0", depends=["d >=3,<4"]),
            helpers.record(name="d", version="1.0"),
            helpers.record(name="d", version="2.0"),
            helpers.record(name="d", version="3.0"),
        ]
        # a and b can be installed
        installed = env.install("a", "b", as_specs=True)
        assert any(k.name == "a" and k.version == "1.0" for k in installed)
        assert any(k.name == "b" and k.version == "1.0" for k in installed)
        # a and c can be installed
        installed = env.install("a", "c", as_specs=True)
        assert any(k.name == "a" and k.version == "2.0" for k in installed)
        assert any(k.name == "c" and k.version == "1.0" for k in installed)
        # b and c can be installed
        installed = env.install("b", "c", as_specs=True)
        assert any(k.name == "b" and k.version == "2.0" for k in installed)
        assert any(k.name == "c" and k.version == "2.0" for k in installed)
        # a, b and c cannot be installed
        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("a", "b", "c")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("a", "d[version='>=1,<2|>=2,<3']"),
                ("b", "d[version='>=1,<2|>=3,<4']"),
                ("c", "d[version='>=2,<3|>=3,<4']"),
            ],
        )

    def test_unsat_expand_single(self, env):
        env.repo_packages = [
            helpers.record(name="a", depends=["b", "c"]),
            helpers.record(name="b", depends=["d >=1,<2"]),
            helpers.record(name="c", depends=["d >=2,<3"]),
            helpers.record(name="d", version="1.0"),
            helpers.record(name="d", version="2.0"),
        ]
        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("a")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("b", "d[version='>=1,<2']"),
                ("c", "d[version='>=2,<3']"),
            ],
        )

    def test_unsat_missing_dep(self, env):
        env.repo_packages = [
            helpers.record(name="a", depends=["b", "c"]),
            helpers.record(name="b", depends=["c >=2,<3"]),
            helpers.record(name="c", version="1.0"),
        ]
        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("a", "b")
        self.assert_unsatisfiable(
            exc_info,
            [
                ("a", "b"),
                ("b",),
            ],
        )

    def test_nonexistent(self, env):
        with pytest.raises((ResolvePackageNotFound, PackagesNotFoundError)):
            env.install("notarealpackage 2.0*")
        with pytest.raises((ResolvePackageNotFound, PackagesNotFoundError)):
            env.install("numpy 1.5")

    def test_timestamps_and_deps(self, env):
        env.repo_packages = index_packages(1) + [
            helpers.record(
                name="mypackage",
                version="1.0",
                build="hash12_0",
                timestamp=1,
                depends=["libpng 1.2.*"],
            ),
            helpers.record(
                name="mypackage",
                version="1.0",
                build="hash15_0",
                timestamp=0,
                depends=["libpng 1.5.*"],
            ),
        ]
        # libpng 1.2
        records_12 = env.install("libpng 1.2.*", "mypackage")
        assert "test::libpng-1.2.50-0" in records_12
        assert "test::mypackage-1.0-hash12_0" in records_12
        # libpng 1.5
        records_15 = env.install("libpng 1.5.*", "mypackage")
        assert "test::libpng-1.5.13-1" in records_15
        assert "test::mypackage-1.0-hash15_0" in records_15
        # this is testing that previously installed reqs are not disrupted
        # by newer timestamps. regression test of sorts for
        #  https://github.com/conda/conda/issues/6271
        assert env.install("mypackage", *env.install("libpng 1.2.*", as_specs=True)) == records_12
        assert env.install("mypackage", *env.install("libpng 1.5.*", as_specs=True)) == records_15
        # unspecified python version should maximize libpng (v1.5),
        # even though it has a lower timestamp
        assert env.install("mypackage") == records_15

    def test_nonexistent_deps(self, env):
        env.repo_packages = index_packages(1) + [
            helpers.record(
                name="mypackage",
                version="1.0",
                depends=["nose", "python 3.3*", "notarealpackage 2.0*"],
            ),
            helpers.record(
                name="mypackage",
                version="1.1",
                depends=["nose", "python 3.3*"],
            ),
            helpers.record(
                name="anotherpackage",
                version="1.0",
                depends=["nose", "mypackage 1.1"],
            ),
            helpers.record(
                name="anotherpackage",
                version="2.0",
                depends=["nose", "mypackage"],
            ),
        ]
        # XXX: missing find_matches and reduced_index
        assert env.install("mypackage") == {
            "test::mypackage-1.1-0",
            "test::nose-1.3.0-py33_0",
            "test::openssl-1.0.1c-0",
            "test::python-3.3.2-0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
            "test::distribute-0.6.36-py33_1",
            "test::pip-1.3.1-py33_1",
        }
        assert env.install("anotherpackage 1.0") == {
            "test::anotherpackage-1.0-0",
            "test::mypackage-1.1-0",
            "test::nose-1.3.0-py33_0",
            "test::openssl-1.0.1c-0",
            "test::python-3.3.2-0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
            "test::distribute-0.6.36-py33_1",
            "test::pip-1.3.1-py33_1",
        }
        assert env.install("anotherpackage") == {
            "test::anotherpackage-2.0-0",
            "test::mypackage-1.1-0",
            "test::nose-1.3.0-py33_0",
            "test::openssl-1.0.1c-0",
            "test::python-3.3.2-0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
            "test::distribute-0.6.36-py33_1",
            "test::pip-1.3.1-py33_1",
        }

        # This time, the latest version is messed up
        env.repo_packages = index_packages(1) + [
            helpers.record(
                name="mypackage",
                version="1.0",
                depends=["nose", "python 3.3*"],
            ),
            helpers.record(
                name="mypackage",
                version="1.1",
                depends=["nose", "python 3.3*", "notarealpackage 2.0*"],
            ),
            helpers.record(
                name="anotherpackage",
                version="1.0",
                depends=["nose", "mypackage 1.0"],
            ),
            helpers.record(
                name="anotherpackage",
                version="2.0",
                depends=["nose", "mypackage"],
            ),
        ]
        # XXX: missing find_matches and reduced_index
        assert env.install("mypackage") == {
            "test::mypackage-1.0-0",
            "test::nose-1.3.0-py33_0",
            "test::openssl-1.0.1c-0",
            "test::python-3.3.2-0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
            "test::distribute-0.6.36-py33_1",
            "test::pip-1.3.1-py33_1",
        }
        # TODO: We need UnsatisfiableError here because mamba does not
        # have more granular exceptions yet.
        with pytest.raises((ResolvePackageNotFound, UnsatisfiableError)):
            env.install("mypackage 1.1")
        assert env.install("anotherpackage 1.0") == {
            "test::anotherpackage-1.0-0",
            "test::mypackage-1.0-0",
            "test::nose-1.3.0-py33_0",
            "test::openssl-1.0.1c-0",
            "test::python-3.3.2-0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
            "test::distribute-0.6.36-py33_1",
            "test::pip-1.3.1-py33_1",
        }

        # If recursive checking is working correctly, this will give
        # anotherpackage 2.0, not anotherpackage 1.0
        assert env.install("anotherpackage") == {
            "test::anotherpackage-2.0-0",
            "test::mypackage-1.0-0",
            "test::nose-1.3.0-py33_0",
            "test::openssl-1.0.1c-0",
            "test::python-3.3.2-0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
            "test::distribute-0.6.36-py33_1",
            "test::pip-1.3.1-py33_1",
        }

    def test_install_package_with_feature(self, env):
        env.repo_packages = index_packages(1) + [
            helpers.record(
                name="mypackage",
                version="1.0",
                depends=["python 3.3*"],
                features="feature",
            ),
            helpers.record(
                name="feature",
                version="1.0",
                depends=["python 3.3*"],
                track_features="feature",
            ),
        ]
        # should not raise
        env.install("mypackage", "feature 1.0")

    def test_unintentional_feature_downgrade(self, env):
        # See https://github.com/conda/conda/issues/6765
        # With the bug in place, this bad build of scipy
        # will be selected for install instead of a later
        # build of scipy 0.11.0.
        good_rec_match = MatchSpec("channel-1::scipy==0.11.0=np17py33_3")
        good_rec = next(prec for prec in index_packages(1) if good_rec_match.match(prec))
        bad_deps = tuple(d for d in good_rec.depends if not d.startswith("numpy"))
        bad_rec = PackageRecord.from_objects(
            good_rec,
            channel="test",
            build=good_rec.build.replace("_3", "_x0"),
            build_number=0,
            depends=bad_deps,
            fn=good_rec.fn.replace("_3", "_x0"),
            url=good_rec.url.replace("_3", "_x0"),
        )

        env.repo_packages = index_packages(1) + [bad_rec]
        records = env.install("scipy 0.11.0")
        assert "test::scipy-0.11.0-np17py33_x0" not in records
        assert "test::scipy-0.11.0-np17py33_3" in records

    def test_circular_dependencies(self, env):
        env.repo_packages = index_packages(1) + [
            helpers.record(
                name="package1",
                depends=["package2"],
            ),
            helpers.record(
                name="package2",
                depends=["package1"],
            ),
        ]
        assert (
            env.install("package1", "package2")
            == env.install("package1")
            == env.install("package2")
        )

    def test_irrational_version(self, env):
        env.repo_packages = index_packages(1)
        assert env.install("pytz 2012d", "python 3*") == {
            "test::distribute-0.6.36-py33_1",
            "test::openssl-1.0.1c-0",
            "test::pip-1.3.1-py33_1",
            "test::python-3.3.2-0",
            "test::pytz-2012d-py33_0",
            "test::readline-6.2-0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
        }

    def test_no_features(self, env):
        env.repo_packages = index_packages(1)

        assert env.install("python 2.6*", "numpy 1.6*", "scipy 0.11*") == {
            "test::distribute-0.6.36-py26_1",
            "test::numpy-1.6.2-py26_4",
            "test::openssl-1.0.1c-0",
            "test::pip-1.3.1-py26_1",
            "test::python-2.6.8-6",
            "test::readline-6.2-0",
            "test::scipy-0.11.0-np16py26_3",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
        }
        assert env.install(
            "python 2.6*", "numpy 1.6*", "scipy 0.11*", MatchSpec(track_features="mkl")
        ) == {
            "test::distribute-0.6.36-py26_1",
            "test::mkl-rt-11.0-p0",
            "test::numpy-1.6.2-py26_p4",
            "test::openssl-1.0.1c-0",
            "test::pip-1.3.1-py26_1",
            "test::python-2.6.8-6",
            "test::readline-6.2-0",
            "test::scipy-0.11.0-np16py26_p3",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
        }

        env.repo_packages += [
            helpers.record(
                name="pandas",
                version="0.12.0",
                build="np16py27_0",
                depends=[
                    "dateutil",
                    "numpy 1.6*",
                    "python 2.7*",
                    "pytz",
                ],
            ),
            helpers.record(
                name="numpy",
                version="1.6.2",
                build="py27_p5",
                build_number=0,
                depends=[
                    "mkl-rt 11.0",
                    "python 2.7",
                ],
                features="mkl",
            ),
        ]
        assert env.install("pandas 0.12.0 np16py27_0", "python 2.7*") == {
            "test::dateutil-2.1-py27_1",
            "test::distribute-0.6.36-py27_1",
            "test::numpy-1.6.2-py27_4",
            "test::openssl-1.0.1c-0",
            "test::pandas-0.12.0-np16py27_0",
            "test::pip-1.3.1-py27_1",
            "test::python-2.7.5-0",
            "test::pytz-2013b-py27_0",
            "test::readline-6.2-0",
            "test::six-1.3.0-py27_0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
        }
        assert env.install(
            "pandas 0.12.0 np16py27_0", "python 2.7*", MatchSpec(track_features="mkl")
        ) == {
            "test::dateutil-2.1-py27_1",
            "test::distribute-0.6.36-py27_1",
            "test::mkl-rt-11.0-p0",
            "test::numpy-1.6.2-py27_p4",
            "test::openssl-1.0.1c-0",
            "test::pandas-0.12.0-np16py27_0",
            "test::pip-1.3.1-py27_1",
            "test::python-2.7.5-0",
            "test::pytz-2013b-py27_0",
            "test::readline-6.2-0",
            "test::six-1.3.0-py27_0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
        }

    @pytest.mark.xfail(reason="CONDA_CHANNEL_PRIORITY does not seem to have any effect")
    def test_channel_priority_1(self, monkeypatch, env):
        # XXX: Test is skipped because CONDA_CHANNEL_PRIORITY does not seems to
        #      have any effect. I have also tried conda.common.io.env_var like
        #      the other tests but no luck.
        env.repo_packages = collections.OrderedDict()
        env.repo_packages["channel-A"] = []
        env.repo_packages["channel-1"] = index_packages(1)

        pandas_0 = self.find_package(
            channel="channel-1",
            name="pandas",
            version="0.10.1",
            build="np17py27_0",
        )
        env.repo_packages["channel-A"].append(pandas_0)

        # channel-1 has pandas np17py27_1, channel-A only has np17py27_0
        # when priority is set, it channel-A should take precedence and
        # np17py27_0 be installed, otherwise np17py27_1 should be installed as
        # it has a higher build version
        monkeypatch.setenv("CONDA_CHANNEL_PRIORITY", "True")
        assert "channel-A::pandas-0.11.0-np16py27_0" in env.install(
            "pandas", "python 2.7*", "numpy 1.6*"
        )
        monkeypatch.setenv("CONDA_CHANNEL_PRIORITY", "False")
        assert "channel-1::pandas-0.11.0-np16py27_1" in env.install(
            "pandas", "python 2.7*", "numpy 1.6*"
        )
        # now lets revert the channels
        env.repo_packages = collections.OrderedDict(reversed(env.repo_packages.items()))
        monkeypatch.setenv("CONDA_CHANNEL_PRIORITY", "True")
        assert "channel-1::pandas-0.11.0-np16py27_1" in env.install(
            "pandas", "python 2.7*", "numpy 1.6*"
        )

    @pytest.mark.xfail(reason="CONDA_CHANNEL_PRIORITY does not seem to have any effect")
    def test_unsat_channel_priority(self, monkeypatch, env):
        # XXX: Test is skipped because CONDA_CHANNEL_PRIORITY does not seems to
        #      have any effect. I have also tried conda.common.io.env_var like
        #      the other tests but no luck.
        env.repo_packages = collections.OrderedDict()
        # higher priority
        env.repo_packages["channel-1"] = [
            helpers.record(
                name="a",
                version="1.0",
                depends=["c"],
            ),
            helpers.record(
                name="b",
                version="1.0",
                depends=["c >=2,<3"],
            ),
            helpers.record(
                name="c",
                version="1.0",
            ),
        ]
        # lower priority, missing c 2.0
        env.repo_packages["channel-2"] = [
            helpers.record(
                name="a",
                version="2.0",
                depends=["c"],
            ),
            helpers.record(
                name="b",
                version="2.0",
                depends=["c >=2,<3"],
            ),
            helpers.record(
                name="c",
                version="1.0",
            ),
            helpers.record(
                name="c",
                version="2.0",
            ),
        ]

        monkeypatch.setenv("CONDA_CHANNEL_PRIORITY", "True")
        records = env.install("a", "b", as_specs=True)
        # channel-1 a and b packages (1.0) installed
        assert any(k.name == "a" and k.version == "1.0" for k in records)
        assert any(k.name == "b" and k.version == "1.0" for k in records)

        monkeypatch.setenv("CONDA_CHANNEL_PRIORITY", "False")
        records = env.install("a", "b", as_specs=True)
        # no channel priority, largest version of a and b (2.0) installed
        assert any(k.name == "a" and k.version == "2.0" for k in records)
        assert any(k.name == "b" and k.version == "2.0" for k in records)

        monkeypatch.setenv("CONDA_CHANNEL_PRIORITY", "True")
        with pytest.raises(UnsatisfiableError) as exc_info:
            env.install("a", "b")
        self.assert_unsatisfiable(exc_info, [("b", "c[version='>=2,<3']")])

    @pytest.mark.xfail(
        reason="There is some weird global state making "
        "this test fail when the whole test suite is run"
    )
    def test_remove(self, env):
        env.repo_packages = index_packages(1)
        records = env.install("pandas", "python 2.7*", as_specs=True)
        assert package_string_set(records) == {
            "test::dateutil-2.1-py27_1",
            "test::distribute-0.6.36-py27_1",
            "test::numpy-1.7.1-py27_0",
            "test::openssl-1.0.1c-0",
            "test::pandas-0.11.0-np17py27_1",
            "test::pip-1.3.1-py27_1",
            "test::python-2.7.5-0",
            "test::pytz-2013b-py27_0",
            "test::readline-6.2-0",
            "test::scipy-0.12.0-np17py27_0",
            "test::six-1.3.0-py27_0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
        }

        env.installed_packages = records
        assert env.remove("pandas") == {
            "test::dateutil-2.1-py27_1",
            "test::distribute-0.6.36-py27_1",
            "test::numpy-1.7.1-py27_0",
            "test::openssl-1.0.1c-0",
            "test::pip-1.3.1-py27_1",
            "test::python-2.7.5-0",
            "test::pytz-2013b-py27_0",
            "test::readline-6.2-0",
            "test::scipy-0.12.0-np17py27_0",
            "test::six-1.3.0-py27_0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
        }
        assert env.remove("numpy") == {
            "test::dateutil-2.1-py27_1",
            "test::distribute-0.6.36-py27_1",
            "test::openssl-1.0.1c-0",
            "test::pip-1.3.1-py27_1",
            "test::python-2.7.5-0",
            "test::pytz-2013b-py27_0",
            "test::readline-6.2-0",
            "test::six-1.3.0-py27_0",
            "test::sqlite-3.7.13-0",
            "test::system-5.8-1",
            "test::tk-8.5.13-0",
            "test::zlib-1.2.7-0",
        }

    def test_surplus_features_1(self, env):
        env.repo_packages += [
            helpers.record(
                name="feature",
                track_features="feature",
            ),
            helpers.record(
                name="package1",
                features="feature",
            ),
            helpers.record(
                name="package2",
                version="1.0",
                features="feature",
                depends=["package1"],
            ),
            helpers.record(
                name="package2",
                version="2.0",
                features="feature",
            ),
        ]
        assert env.install("package2", "feature") == {
            "test::package2-2.0-0",
            "test::feature-1.0-0",
        }

    def test_surplus_features_2(self, env):
        env.repo_packages += [
            helpers.record(
                name="feature",
                track_features="feature",
            ),
            helpers.record(
                name="package1",
                features="feature",
            ),
            helpers.record(
                name="package2",
                version="1.0",
                build_number=0,
                features="feature",
                depends=["package1"],
            ),
            helpers.record(
                name="package2",
                version="1.0",
                build_number=1,
                features="feature",
            ),
        ]
        assert env.install("package2", "feature") == {
            "test::package2-1.0-0",
            "test::feature-1.0-0",
        }

    def test_get_reduced_index_broadening_with_unsatisfiable_early_dep(self, env):
        # Test that spec broadening reduction doesn't kill valid solutions
        #    In other words, the order of packages in the index should not affect the
        #    overall result of the reduced index.
        # see discussion at https://github.com/conda/conda/pull/8117#discussion_r249249815
        env.repo_packages += [
            helpers.record(
                name="a",
                version="1.0",
                # not satisfiable. This record should come first, so that its c==2
                # constraint tries to mess up the inclusion of the c record below,
                # which should be included as part of b's deps, but which is
                # broader than this dep.
                depends=["b", "c==2"],
            ),
            helpers.record(
                name="a",
                version="2.0",
                depends=["b"],
            ),
            helpers.record(
                name="b",
                depends=["c"],
            ),
            helpers.record(
                name="c",
            ),
        ]
        assert env.install("a") == {
            "test::a-2.0-0",
            "test::b-1.0-0",
            "test::c-1.0-0",
        }

    def test_get_reduced_index_broadening_preferred_solution(self, env):
        # test that order of index reduction does not eliminate what should be a preferred solution
        #    https://github.com/conda/conda/pull/8117#discussion_r249216068
        env.repo_packages += [
            helpers.record(
                name="top",
                version="1.0",
                # this is the first processed record, and imposes a broadening constraint on bottom
                #    if things are overly restricted, we'll end up with bottom 1.5 in our solution
                #    instead of the preferred (latest) 2.5
                depends=["middle", "bottom==1.5"],
            ),
            helpers.record(
                name="top",
                version="2.0",
                depends=["middle"],
            ),
            helpers.record(
                name="middle",
                depends=["bottom"],
            ),
            helpers.record(
                name="bottom",
                version="1.5",
            ),
            helpers.record(
                name="bottom",
                version="2.5",
            ),
        ]
        for record in env.install("top", as_specs=True):
            if record.name == "top":
                assert (
                    record.version == "2.0"
                ), f"top version should be 2.0, but is {record.version}"
            elif record.name == "bottom":
                assert (
                    record.version == "2.5"
                ), f"bottom version should be 2.5, but is {record.version}"

    def test_arch_preferred_over_noarch_when_otherwise_equal(self, env):
        env.repo_packages += [
            helpers.record(
                name="package1",
                subdir="noarch",
            ),
            helpers.record(
                name="package1",
            ),
        ]
        records = env.install("package1", as_specs=True)
        assert len(records) == 1
        assert records[0].subdir == context.subdir

    def test_noarch_preferred_over_arch_when_version_greater(self, env):
        env.repo_packages += [
            helpers.record(
                name="package1",
                version="2.0",
                subdir="noarch",
            ),
            helpers.record(
                name="package1",
                version="1.0",
            ),
        ]
        records = env.install("package1", as_specs=True)
        assert len(records) == 1
        assert records[0].subdir == "noarch"

    def test_noarch_preferred_over_arch_when_version_greater_dep(self, env):
        env.repo_packages += [
            helpers.record(
                name="package1",
                version="1.0",
            ),
            helpers.record(
                name="package1",
                version="2.0",
                subdir="noarch",
            ),
            helpers.record(
                name="package2",
                depends=["package1"],
            ),
        ]
        records = env.install("package2", as_specs=True)
        package1 = self.find_package_in_list(records, name="package1")
        assert package1.subdir == "noarch"

    def test_noarch_preferred_over_arch_when_build_greater(self, env):
        env.repo_packages += [
            helpers.record(
                name="package1",
                build_number=0,
            ),
            helpers.record(
                name="package1",
                build_number=1,
                subdir="noarch",
            ),
        ]
        records = env.install("package1", as_specs=True)
        assert len(records) == 1
        assert records[0].subdir == "noarch"

    def test_noarch_preferred_over_arch_when_build_greater_dep(self, env):
        env.repo_packages += [
            helpers.record(
                name="package1",
                build_number=0,
            ),
            helpers.record(
                name="package1",
                build_number=1,
                subdir="noarch",
            ),
            helpers.record(
                name="package2",
                depends=["package1"],
            ),
        ]
        records = env.install("package2", as_specs=True)
        package1 = self.find_package_in_list(records, name="package1")
        assert package1.subdir == "noarch"
