import logging
import os
from itertools import chain
from unittest.mock import Mock

import pytest

from validate_pyproject import api, formats

_chain_iter = chain.from_iterable

# The following examples were taken by inspecting some opensource projects in the python
# community
ENTRYPOINT_EXAMPLES = {
    "django": {
        "console_scripts": {
            "django-admin": "django.core.management:execute_from_command_line"
        }
    },
    "pandas": {
        "pandas_plotting_backends": {"matplotlib": "pandas:plotting._matplotlib"},
    },
    "PyScaffold": {
        "console_scripts": {"putup": "pyscaffold.cli:run"},
        "pyscaffold.cli": {
            "config": "pyscaffold.extensions.config:Config",
            "interactive": "pyscaffold.extensions.interactive:Interactive",
            "venv": "pyscaffold.extensions.venv:Venv",
            "namespace": "pyscaffold.extensions.namespace:Namespace",
            "no_skeleton": "pyscaffold.extensions.no_skeleton:NoSkeleton",
            "pre_commit": "pyscaffold.extensions.pre_commit:PreCommit",
            "no_tox": "pyscaffold.extensions.no_tox:NoTox",
            "gitlab": "pyscaffold.extensions.gitlab_ci:GitLab",
            "cirrus": "pyscaffold.extensions.cirrus:Cirrus",
            "no_pyproject": "pyscaffold.extensions.no_pyproject:NoPyProject",
        },
    },
    "setuptools-scm": {
        "distutils.setup_keywords": {
            "use_scm_version": "setuptools_scm.integration:version_keyword",
        },
        "setuptools.file_finders": {
            "setuptools_scm": "setuptools_scm.integration:find_files",
        },
        "setuptools.finalize_distribution_options": {
            "setuptools_scm": "setuptools_scm.integration:infer_version",
        },
        "setuptools_scm.files_command": {
            ".hg": "setuptools_scm.file_finder_hg:hg_find_files",
            ".git": "setuptools_scm.file_finder_git:git_find_files",
        },
        "setuptools_scm.local_scheme": {
            "node-and-date": "setuptools_scm.version:get_local_node_and_date",
            "node-and-timestamp": "setuptools_scm.version:get_local_node_and_timestamp",
            "dirty-tag": "setuptools_scm.version:get_local_dirty_tag",
            "no-local-version": "setuptools_scm.version:get_no_local_node",
        },
        "setuptools_scm.parse_scm": {
            ".hg": "setuptools_scm.hg:parse",
            ".git": "setuptools_scm.git:parse",
        },
        "setuptools_scm.parse_scm_fallback": {
            ".hg_archival.txt": "setuptools_scm.hg:parse_archival",
            "PKG-INFO": "setuptools_scm.hacks:parse_pkginfo",
            "pip-egg-info": "setuptools_scm.hacks:parse_pip_egg_info",
            "setup.py": "setuptools_scm.hacks:fallback_version",
        },
        "setuptools_scm.version_scheme": {
            "guess-next-dev": "setuptools_scm.version:guess_next_dev_version",
            "post-release": "setuptools_scm.version:postrelease_version",
            "python-simplified-semver": "setuptools_scm.version:simplified_semver_version",
            "release-branch-semver": "setuptools_scm.version:release_branch_semver_version",
            "no-guess-dev": "setuptools_scm.version:no_guess_dev_version",
            "calver-by-date": "setuptools_scm.version:calver_by_date",
        },
    },
    "anyio": {
        "pytest11": {
            "anyio": "anyio.pytest_plugin",
        },
    },
}


@pytest.mark.parametrize(
    "example", _chain_iter(v.keys() for v in ENTRYPOINT_EXAMPLES.values())
)
def test_entrypoint_group(example):
    assert formats.python_entrypoint_group(example)


@pytest.mark.parametrize(
    "example",
    _chain_iter(
        _chain_iter(e.keys() for e in v.values()) for v in ENTRYPOINT_EXAMPLES.values()
    ),
)
def test_entrypoint_name(example):
    assert formats.python_entrypoint_name(example)


@pytest.mark.parametrize("example", [" invalid", "=invalid", "[invalid]", "[invalid"])
def test_entrypoint_invalid_name(example):
    assert formats.python_entrypoint_name(example) is False


@pytest.mark.parametrize("example", ["val[id", "also valid"])
def test_entrypoint_name_not_recommended(example, caplog):
    caplog.set_level(logging.WARNING)
    assert formats.python_entrypoint_name(example) is True
    assert "does not follow recommended pattern" in caplog.text


@pytest.mark.parametrize(
    "example",
    _chain_iter(
        _chain_iter(e.values() for e in v.values())
        for v in ENTRYPOINT_EXAMPLES.values()
    ),
)
def test_entrypoint_references(example):
    assert formats.python_entrypoint_reference(example)
    assert formats.pep517_backend_reference(example)
    assert formats.pep517_backend_reference(example.replace(":", "."))


def test_entrypoint_references_with_extras():
    example = "test.module:func [invalid"
    assert formats.python_entrypoint_reference(example) is False

    example = "test.module:func [valid]"
    assert formats.python_entrypoint_reference(example)
    assert formats.pep517_backend_reference(example) is False

    example = "test.module:func [valid, extras]"
    assert formats.python_entrypoint_reference(example)

    example = "test.module:func [??inva#%@!lid??]"
    assert formats.python_entrypoint_reference(example) is False


@pytest.mark.parametrize("example", ["module", "invalid-module"])
def test_invalid_entrypoint_references(example):
    result = example == "module"
    assert formats.python_entrypoint_reference(example) is result


@pytest.mark.parametrize("example", ["λ", "a", "_"])
def test_valid_python_identifier(example):
    assert formats.python_identifier(example)


@pytest.mark.parametrize("example", ["a.b", "x+y", " a", "☺"])
def test_invalid_python_identifier(example):
    assert formats.python_identifier(example) is False


@pytest.mark.parametrize(
    "example",
    [
        "0.9.10",
        "1988.12",
        "1.01rc1",
        "0.99a9",
        "3.14b5",
        "1.42.post0",
        "1.73a2.post0",
        "2.23.post6.dev0",
        "3!6.0",
        "1.0+abc.7",
        "v4.0.1",
    ],
)
def test_valid_pep440(example):
    assert formats.pep440(example)


@pytest.mark.parametrize(
    "example",
    [
        "0-9-10",
        "v4.0.1.mysuffix",
        "p4.0.2",
    ],
)
def test_invalid_pep440(example):
    assert formats.pep440(example) is False


@pytest.mark.parametrize(
    "example",
    [
        "~= 0.9, >= 1.0, != 1.3.4.*, < 2.0",
        ">= 1.4.5, == 1.4.*",
        "~= 2.2.post3",
        "!= 1.1.post1",
    ],
)
def test_valid_pep508_versionspec(example):
    assert formats.pep508_versionspec(example)


@pytest.mark.parametrize(
    "example",
    [
        "~ 0.9, ~> 1.0, - 1.3.4.*",
        "- 1.3.4.*",
        "~> 1.0",
        "~ 0.9",
        "@ file:///localbuilds/pip-1.3.1.zip",
        'v1.0; python_version<"2.7"',
    ],
)
def test_invalid_pep508_versionspec(example):
    assert formats.pep508_versionspec(example) is False


@pytest.mark.parametrize(
    "example",
    [
        "https://python.org",
        "http://python.org",
        "http://localhost:8000",
        "ftp://python.org",
        "scheme://netloc/path;parameters?query#fragment",
    ],
)
def test_valid_url(example):
    assert formats.url(example)


@pytest.mark.parametrize(
    "example",
    [
        "",
        42,
        "p@python.org",
        "http:python.org",
        "/python.org",
    ],
)
def test_invalid_url(example):
    assert formats.url(example) is False


@pytest.mark.parametrize(
    "example",
    [
        "ab",
        "ab.c.d",
        "abc._d.λ",
    ],
)
def test_valid_module_name(example):
    assert formats.python_module_name(example) is True


@pytest.mark.parametrize(
    "example",
    [
        "-",
        " ",
        "ab-cd",
        ".example",
    ],
)
def test_invalid_module_name(example):
    assert formats.python_module_name(example) is False


@pytest.mark.parametrize(
    "example",
    [
        "pip-run",
        "abc-d-λ",
        "abc-d-λ.xyz-e",
        "abc-d.λ-xyz-e",
    ],
)
def test_valid_module_name_relaxed(example):
    assert formats.python_module_name_relaxed(example) is True


@pytest.mark.parametrize(
    "example",
    [
        "pip run",
        "-pip-run",
        "pip-run-",
        "pip-run-stubs",
    ],
)
def test_invalid_module_name_relaxed(example):
    assert formats.python_module_name_relaxed(example) is False


@pytest.mark.parametrize(
    "example",
    [
        "MIT",
        "Bsd-3-clause",
        "mit and (apache-2.0 or bsd-2-clause)",
        "MIT OR GPL-2.0-or-later OR (FSFUL AND BSD-2-Clause)",
        "GPL-3.0-only WITH Classpath-exception-2.0 OR BSD-3-Clause",
        "LicenseRef-Special-License OR CC0-1.0 OR Unlicense",
        "LicenseRef-Public-Domain",
        "licenseref-proprietary",
        "LicenseRef-Beerware-4.2",
        "(LicenseRef-Special-License OR LicenseRef-OtherLicense) OR Unlicense",
    ],
)
def test_valid_pep639_license_expression(example):
    assert formats.SPDX(example) is True


@pytest.mark.parametrize(
    "example",
    [
        "",
        "Use-it-after-midnight",
        "LicenseRef-License with spaces",
        "LicenseRef-License_with_underscores",
        "or",
        "and",
        "with",
        "mit or",
        "mit and",
        "mit with",
        "or mit",
        "and mit",
        "with mit",
        "(mit",
        "mit)",
        "mit or or apache-2.0",
        # Missing an operator before `(`.
        "mit or apache-2.0 (bsd-3-clause and MPL-2.0)",
        # "2-BSD-Clause is not a valid license.
        "Apache-2.0 OR 2-BSD-Clause",
    ],
)
def test_invalid_pep639_license_expression(example):
    assert formats.SPDX(example) is False


class TestClassifiers:
    """The ``_TroveClassifier`` class and ``_download_classifiers`` are part of the
    private API and therefore need to be tested.

    By constantly testing them we can make sure the URL used to download classifiers and
    the format they are presented are still supported by PyPI.

    If at any point these tests start to fail, we know that we need to change strategy.
    """

    VALID_CLASSIFIERS = (
        "Development Status :: 5 - Production/Stable",
        "Framework :: Django",
        "Operating System :: POSIX",
        "Programming Language :: Python :: 3 :: Only",
        "private :: not really a classifier",
    )

    def test_does_not_break_public_function_detection(self):
        # See https://github.com/abravalheri/validate-pyproject/issues/12

        # When `trove_classifiers` is defined from the dependency package
        # it will be a function.
        # When it is defined based on the download, it will be a custom object.

        # In both cases the `_TroveClassifier` class should not be made public,
        # but the instance should

        trove_classifier = formats._TroveClassifier()
        _formats = Mock(
            _TroveClassifier=formats._TroveClassifier,
            trove_classifiers=trove_classifier,
        )
        fns = api._get_public_functions(_formats)
        assert fns == {"trove-classifier": trove_classifier}

        # Make sure the object and the function have the same name
        assert "trove-classifier" in api.FORMAT_FUNCTIONS
        normalized_name = trove_classifier.__name__.replace("_", "-")
        assert normalized_name == "trove-classifier"
        assert normalized_name in api.FORMAT_FUNCTIONS

        func_name = trove_classifier.__name__
        assert getattr(formats, func_name) in api.FORMAT_FUNCTIONS.values()

    def test_download(self):
        try:
            classifiers = formats._download_classifiers()
        except Exception as ex:
            pytest.xfail(f"Error with download: {ex.__class__.__name__} - {ex}")
        assert isinstance(classifiers, str)
        assert bytes(classifiers, "utf-8")

    @pytest.mark.skip(reason="no downloads allowed while package build")
    def test_downloaded(self, monkeypatch):
        if os.name != "posix":
            # Mock on Windows (problems with SSL)
            downloader = Mock(return_value="\n".join(self.VALID_CLASSIFIERS))
            monkeypatch.setattr(formats, "_download_classifiers", downloader)

        validator = formats._TroveClassifier()
        assert validator("Made Up :: Classifier") is False
        assert validator.downloaded is not None
        assert validator.downloaded is not False
        assert len(validator.downloaded) > 3

    def test_valid_download_only_once(self, monkeypatch):
        if os.name == "posix":
            # Really download to make sure the API is still exposed by PyPI
            downloader = Mock(side_effect=formats._download_classifiers)
        else:
            # Mock on Windows (problems with SSL)
            downloader = Mock(return_value="\n".join(self.VALID_CLASSIFIERS))

        monkeypatch.setattr(formats, "_download_classifiers", downloader)
        validator = formats._TroveClassifier()
        for classifier in self.VALID_CLASSIFIERS:
            assert validator(classifier) is True
        downloader.assert_called_once()

    @pytest.mark.parametrize(
        "no_network", ("NO_NETWORK", "VALIDATE_PYPROJECT_NO_NETWORK")
    )
    def test_always_valid_with_no_network(self, monkeypatch, no_network):
        monkeypatch.setenv(no_network, "1")
        validator = formats._TroveClassifier()
        assert validator("Made Up :: Classifier") is True
        assert not validator.downloaded
        assert validator("Other Made Up :: Classifier") is True
        assert not validator.downloaded

    def test_always_valid_with_skip_download(self):
        validator = formats._TroveClassifier()
        validator._disable_download()
        assert validator("Made Up :: Classifier") is True
        assert not validator.downloaded
        assert validator("Other Made Up :: Classifier") is True
        assert not validator.downloaded

    def test_always_valid_after_download_error(self, monkeypatch):
        def _failed_download():
            raise OSError()

        monkeypatch.setattr(formats, "_download_classifiers", _failed_download)
        validator = formats._TroveClassifier()
        assert validator("Made Up :: Classifier") is True
        assert not validator.downloaded
        assert validator("Other Made Up :: Classifier") is True
        assert not validator.downloaded


@pytest.mark.skip(reason="no downloads allowed while package build")
def test_private_classifier():
    assert formats.trove_classifier("private :: Keep Off PyPI") is True
    assert formats.trove_classifier("private:: Keep Off PyPI") is False