# Copyright (c) Twisted Matrix Laboratories.
# See LICENSE for details.

"""
Tests for parts of our release automation system.
"""


import os
import sys


from setuptools.dist import Distribution

from twisted.trial.unittest import TestCase

from twisted.python import dist
from twisted.python.dist import (get_setup_args, ConditionalExtension,
                                 build_scripts_twisted, _EXTRAS_REQUIRE)
from twisted.python.filepath import FilePath



class SetupTests(TestCase):
    """
    Tests for L{get_setup_args}.
    """
    def test_conditionalExtensions(self):
        """
        Passing C{conditionalExtensions} as a list of L{ConditionalExtension}
        objects to get_setup_args inserts a custom build_ext into the result
        which knows how to check whether they should be built.
        """
        good_ext = ConditionalExtension("whatever", ["whatever.c"],
                                        condition=lambda b: True)
        bad_ext = ConditionalExtension("whatever", ["whatever.c"],
                                        condition=lambda b: False)
        args = get_setup_args(conditionalExtensions=[good_ext, bad_ext])
        # ext_modules should be set even though it's not used.  See comment
        # in get_setup_args
        self.assertEqual(args["ext_modules"], [good_ext, bad_ext])
        cmdclass = args["cmdclass"]
        build_ext = cmdclass["build_ext"]
        builder = build_ext(Distribution())
        builder.prepare_extensions()
        self.assertEqual(builder.extensions, [good_ext])


    def test_win32Definition(self):
        """
        When building on Windows NT, the WIN32 macro will be defined as 1.
        """
        ext = ConditionalExtension("whatever", ["whatever.c"],
                                   define_macros=[("whatever", 2)])
        args = get_setup_args(conditionalExtensions=[ext])
        builder = args["cmdclass"]["build_ext"](Distribution())
        self.patch(os, "name", "nt")
        builder.prepare_extensions()
        self.assertEqual(ext.define_macros, [("whatever", 2), ("WIN32", 1)])



class OptionalDependenciesTests(TestCase):
    """
    Tests for L{_EXTRAS_REQUIRE}
    """

    def test_distributeTakesExtrasRequire(self):
        """
        Setuptools' Distribution object parses and stores its C{extras_require}
        argument as an attribute.
        """
        extras = dict(im_an_extra_dependency="thing")
        attrs = dict(extras_require=extras)
        distribution = Distribution(attrs)
        self.assertEqual(
            extras,
            distribution.extras_require
        )


    def test_extrasRequireDictContainsKeys(self):
        """
        L{_EXTRAS_REQUIRE} contains options for all documented extras: C{dev},
        C{tls}, C{conch}, C{soap}, C{serial}, C{all_non_platform},
        C{osx_platform}, and C{windows_platform}.
        """
        self.assertIn('dev', _EXTRAS_REQUIRE)
        self.assertIn('tls', _EXTRAS_REQUIRE)
        self.assertIn('conch', _EXTRAS_REQUIRE)
        self.assertIn('soap', _EXTRAS_REQUIRE)
        self.assertIn('serial', _EXTRAS_REQUIRE)
        self.assertIn('all_non_platform', _EXTRAS_REQUIRE)
        self.assertIn('osx_platform', _EXTRAS_REQUIRE)
        self.assertIn('windows_platform', _EXTRAS_REQUIRE)


    def test_extrasRequiresDevDeps(self):
        """
        L{_EXTRAS_REQUIRE}'s C{dev} extra contains setuptools requirements for
        the tools required for Twisted development.
        """
        deps = _EXTRAS_REQUIRE['dev']
        self.assertIn('twistedchecker >= 0.4.0', deps)
        self.assertIn('pyflakes >= 1.0.0', deps)
        self.assertIn('twisted-dev-tools >= 0.0.2', deps)
        self.assertIn('python-subunit', deps)
        self.assertIn('sphinx >= 1.3.1', deps)
        self.assertIn('pydoctor >= 15.0.0', deps)


    def test_extrasRequiresTlsDeps(self):
        """
        L{_EXTRAS_REQUIRE}'s C{tls} extra contains setuptools requirements for
        the packages required to make Twisted's transport layer security fully
        work for both clients and servers.
        """
        deps = _EXTRAS_REQUIRE['tls']
        self.assertIn('pyopenssl >= 0.13', deps)
        self.assertIn('service_identity', deps)
        self.assertIn('idna >= 0.6', deps)


    def test_extrasRequiresConchDeps(self):
        """
        L{_EXTRAS_REQUIRE}'s C{conch} extra contains setuptools requirements
        for the packages required to make Twisted Conch's secure shell server
        work.
        """
        deps = _EXTRAS_REQUIRE['conch']
        self.assertIn('gmpy', deps)
        self.assertIn('pyasn1', deps)
        self.assertIn('cryptography >= 0.9.1', deps)
        self.assertIn('appdirs >= 1.4.0', deps)


    def test_extrasRequiresSoapDeps(self):
        """
        L{_EXTRAS_REQUIRE}' C{soap} extra contains setuptools requirements for
        the packages required to make the C{twisted.web.soap} module function.
        """
        self.assertIn(
            'soappy',
            _EXTRAS_REQUIRE['soap']
        )


    def test_extrasRequiresSerialDeps(self):
        """
        L{_EXTRAS_REQUIRE}'s C{serial} extra contains setuptools requirements
        for the packages required to make Twisted's serial support work.
        """
        self.assertIn(
            'pyserial',
            _EXTRAS_REQUIRE['serial']
        )


    def test_extrasRequiresAllNonPlatformDeps(self):
        """
        L{_EXTRAS_REQUIRE}'s C{all_non_platform} extra contains setuptools
        requirements for all of Twisted's optional dependencies which work on
        all supported operating systems.
        """
        deps = _EXTRAS_REQUIRE['all_non_platform']
        self.assertIn('pyopenssl >= 0.13', deps)
        self.assertIn('service_identity', deps)
        self.assertIn('idna >= 0.6', deps)
        self.assertIn('gmpy', deps)
        self.assertIn('pyasn1', deps)
        self.assertIn('cryptography >= 0.9.1', deps)
        self.assertIn('soappy', deps)
        self.assertIn('pyserial', deps)
        self.assertIn('appdirs >= 1.4.0', deps)


    def test_extrasRequiresOsxPlatformDeps(self):
        """
        L{_EXTRAS_REQUIRE}'s C{osx_platform} extra contains setuptools
        requirements for all of Twisted's optional dependencies usable on the
        Mac OS X platform.
        """
        deps = _EXTRAS_REQUIRE['osx_platform']
        self.assertIn('pyopenssl >= 0.13', deps)
        self.assertIn('service_identity', deps)
        self.assertIn('idna >= 0.6', deps)
        self.assertIn('gmpy', deps)
        self.assertIn('pyasn1', deps)
        self.assertIn('cryptography >= 0.9.1', deps)
        self.assertIn('soappy', deps)
        self.assertIn('pyserial', deps)
        self.assertIn('pyobjc', deps)


    def test_extrasRequiresWindowsPlatformDeps(self):
        """
        L{_EXTRAS_REQUIRE}'s C{windows_platform} extra contains setuptools
        requirements for all of Twisted's optional dependencies usable on the
        Microsoft Windows platform.
        """
        deps = _EXTRAS_REQUIRE['windows_platform']
        self.assertIn('pyopenssl >= 0.13', deps)
        self.assertIn('service_identity', deps)
        self.assertIn('idna >= 0.6', deps)
        self.assertIn('gmpy', deps)
        self.assertIn('pyasn1', deps)
        self.assertIn('cryptography >= 0.9.1', deps)
        self.assertIn('soappy', deps)
        self.assertIn('pyserial', deps)
        self.assertIn('pypiwin32', deps)



class GetVersionTests(TestCase):
    """
    Tests for L{dist.getVersion}.
    """

    def setUp(self):
        self.dirname = self.mktemp()
        os.mkdir(self.dirname)

    def test_getVersionCore(self):
        """
        Test that getting the version of core reads from the
        [base]/_version.py file.
        """
        f = open(os.path.join(self.dirname, "_version.py"), "w")
        f.write("""
from twisted.python import versions
version = versions.Version("twisted", 0, 1, 2)
""")
        f.close()
        self.assertEqual(dist.getVersion(base=self.dirname), "0.1.2")



class GetScriptsTests(TestCase):
    """
    Tests for L{dist.getScripts} which returns the scripts which should be
    included in the distribution of a project.
    """

    def test_excludedPreamble(self):
        """
        L{dist.getScripts} includes neither C{"_preamble.py"} nor
        C{"_preamble.pyc"}.
        """
        basedir = FilePath(self.mktemp())
        bin = basedir.child('bin')
        bin.makedirs()
        bin.child('_preamble.py').setContent('some preamble code\n')
        bin.child('_preamble.pyc').setContent('some preamble byte code\n')
        bin.child('program').setContent('good program code\n')
        scripts = dist.getScripts(basedir=basedir.path)
        self.assertEqual(scripts, [bin.child('program').path])


    def test_scriptsInRelease(self):
        """
        getScripts should return the scripts associated with a project
        in the context of a released subproject tarball.
        """
        basedir = self.mktemp()
        os.mkdir(basedir)
        os.mkdir(os.path.join(basedir, 'bin'))
        f = open(os.path.join(basedir, 'bin', 'exy'), 'w')
        f.write('yay')
        f.close()
        scripts = dist.getScripts(basedir=basedir)
        self.assertEqual(len(scripts), 1)
        self.assertEqual(os.path.basename(scripts[0]), 'exy')


    def test_getScriptsTopLevel(self):
        """
        getScripts returns scripts that are (only) in the top level bin
        directory.
        """
        basedir = FilePath(self.mktemp())
        basedir.createDirectory()
        bindir = basedir.child("bin")
        bindir.createDirectory()
        included = bindir.child("included")
        included.setContent("yay included")
        subdir = bindir.child("subdir")
        subdir.createDirectory()
        subdir.child("not-included").setContent("not included")

        scripts = dist.getScripts(basedir=basedir.path)
        self.assertEqual(scripts, [included.path])



class DummyCommand:
    """
    A fake Command.
    """
    def __init__(self, **kwargs):
        for kw, val in kwargs.items():
            setattr(self, kw, val)

    def ensure_finalized(self):
        pass



class BuildScriptsTests(TestCase):
    """
    Tests for L{dist.build_scripts_twisted}.
    """

    def setUp(self):
        self.source = FilePath(self.mktemp())
        self.target = FilePath(self.mktemp())
        self.source.makedirs()
        self.addCleanup(os.chdir, os.getcwd())
        os.chdir(self.source.path)


    def buildScripts(self):
        """
        Write 3 types of scripts and run the L{build_scripts_twisted}
        command.
        """
        self.writeScript(self.source, "script1",
                          ("#! /usr/bin/env python2.7\n"
                           "# bogus script w/ Python sh-bang\n"
                           "pass\n"))

        self.writeScript(self.source, "script2.py",
                        ("#!/usr/bin/python\n"
                         "# bogus script w/ Python sh-bang\n"
                         "pass\n"))

        self.writeScript(self.source, "shell.sh",
                        ("#!/bin/sh\n"
                         "# bogus shell script w/ sh-bang\n"
                         "exit 0\n"))

        expected = ['script1', 'script2.py', 'shell.sh']
        cmd = self.getBuildScriptsCmd(self.target,
                                     [self.source.child(fn).path
                                      for fn in expected])
        cmd.finalize_options()
        cmd.run()

        return self.target.listdir()


    def getBuildScriptsCmd(self, target, scripts):
        """
        Create a distutils L{Distribution} with a L{DummyCommand} and wrap it
        in L{build_scripts_twisted}.

        @type target: L{FilePath}
        """
        dist = Distribution()
        dist.scripts = scripts
        dist.command_obj["build"] = DummyCommand(
            build_scripts = target.path,
            force = 1,
            executable = sys.executable
        )
        return build_scripts_twisted(dist)


    def writeScript(self, dir, name, text):
        """
        Write the script to disk.
        """
        with open(dir.child(name).path, "w") as f:
            f.write(text)


    def test_notWindows(self):
        """
        L{build_scripts_twisted} does not rename scripts on non-Windows
        platforms.
        """
        self.patch(os, "name", "twisted")
        built = self.buildScripts()
        for name in ['script1', 'script2.py', 'shell.sh']:
            self.assertTrue(name in built)


    def test_windows(self):
        """
        L{build_scripts_twisted} renames scripts so they end with '.py' on
        the Windows platform.
        """
        self.patch(os, "name", "nt")
        built = self.buildScripts()
        for name in ['script1.py', 'script2.py', 'shell.sh.py']:
            self.assertTrue(name in built)



class FakeModule(object):
    """
    A fake module, suitable for dependency injection in testing.
    """
    def __init__(self, attrs):
        """
        Initializes a fake module.

        @param attrs: The attrs that will be accessible on the module.
        @type attrs: C{dict} of C{str} (Python names) to objects
        """
        self._attrs = attrs


    def __getattr__(self, name):
        """
        Gets an attribute of this fake module from its attrs.

        @raise AttributeError: When the requested attribute is missing.
        """
        try:
            return self._attrs[name]
        except KeyError:
            raise AttributeError()



fakeCPythonPlatform = FakeModule({"python_implementation": lambda: "CPython"})
fakeOtherPlatform = FakeModule({"python_implementation": lambda: "lvhpy"})



class WithPlatformTests(TestCase):
    """
    Tests for L{_checkCPython} when used with a (fake) C{platform} module.
    """
    def test_cpython(self):
        """
        L{_checkCPython} returns C{True} when C{platform.python_implementation}
        says we're running on CPython.
        """
        self.assertTrue(dist._checkCPython(platform=fakeCPythonPlatform))


    def test_other(self):
        """
        L{_checkCPython} returns C{False} when C{platform.python_implementation}
        says we're not running on CPython.
        """
        self.assertFalse(dist._checkCPython(platform=fakeOtherPlatform))
