import sys
import os
import tempfile
import shutil
from io import StringIO

from distutils.core import Extension, Distribution
from distutils.command.build_ext import build_ext
from distutils import sysconfig
from distutils.tests.support import TempdirManager
from distutils.tests.support import LoggingSilencer
from distutils.extension import Extension
from distutils.errors import UnknownFileError
from distutils.errors import CompileError

import unittest
from test import support

# http://bugs.python.org/issue4373
# Don't load the xx module more than once.
ALREADY_TESTED = False

def _get_source_filename():
    srcdir = sysconfig.get_config_var('srcdir')
    return os.path.join(srcdir, 'Modules', 'xxmodule.c')

class BuildExtTestCase(TempdirManager,
                       LoggingSilencer,
                       unittest.TestCase):
    def setUp(self):
        # Create a simple test environment
        # Note that we're making changes to sys.path
        super(BuildExtTestCase, self).setUp()
        self.tmp_dir = self.mkdtemp()
        self.sys_path = sys.path[:]
        sys.path.append(self.tmp_dir)
        shutil.copy(_get_source_filename(), self.tmp_dir)
        if sys.version > "2.6":
            import site
            self.old_user_base = site.USER_BASE
            site.USER_BASE = self.mkdtemp()
            from distutils.command import build_ext
            build_ext.USER_BASE = site.USER_BASE

    def test_build_ext(self):
        global ALREADY_TESTED
        xx_c = os.path.join(self.tmp_dir, 'xxmodule.c')
        xx_ext = Extension('xx', [xx_c])
        dist = Distribution({'name': 'xx', 'ext_modules': [xx_ext]})
        dist.package_dir = self.tmp_dir
        cmd = build_ext(dist)
        if os.name == "nt":
            # On Windows, we must build a debug version iff running
            # a debug build of Python
            cmd.debug = sys.executable.endswith("_d.exe")
        cmd.build_lib = self.tmp_dir
        cmd.build_temp = self.tmp_dir

        old_stdout = sys.stdout
        if not support.verbose:
            # silence compiler output
            sys.stdout = StringIO()
        try:
            cmd.ensure_finalized()
            cmd.run()
        finally:
            sys.stdout = old_stdout

        if ALREADY_TESTED:
            return
        else:
            ALREADY_TESTED = True

        import xx

        for attr in ('error', 'foo', 'new', 'roj'):
            self.assert_(hasattr(xx, attr))

        self.assertEquals(xx.foo(2, 5), 7)
        self.assertEquals(xx.foo(13,15), 28)
        self.assertEquals(xx.new().demo(), None)
        doc = 'This is a template module just for instruction.'
        self.assertEquals(xx.__doc__, doc)
        self.assert_(isinstance(xx.Null(), xx.Null))
        self.assert_(isinstance(xx.Str(), xx.Str))

    def tearDown(self):
        # Get everything back to normal
        support.unload('xx')
        sys.path = self.sys_path
        if sys.version > "2.6":
            import site
            site.USER_BASE = self.old_user_base
            from distutils.command import build_ext
            build_ext.USER_BASE = self.old_user_base
        super(BuildExtTestCase, self).tearDown()

    def test_solaris_enable_shared(self):
        dist = Distribution({'name': 'xx'})
        cmd = build_ext(dist)
        old = sys.platform

        sys.platform = 'sunos' # fooling finalize_options
        from distutils.sysconfig import  _config_vars
        old_var = _config_vars.get('Py_ENABLE_SHARED')
        _config_vars['Py_ENABLE_SHARED'] = 1
        try:
            cmd.ensure_finalized()
        finally:
            sys.platform = old
            if old_var is None:
                del _config_vars['Py_ENABLE_SHARED']
            else:
                _config_vars['Py_ENABLE_SHARED'] = old_var

        # make sur we get some lobrary dirs under solaris
        self.assert_(len(cmd.library_dirs) > 0)

    def test_user_site(self):
        # site.USER_SITE was introduced in 2.6
        if sys.version < '2.6':
            return

        import site
        dist = Distribution({'name': 'xx'})
        cmd = build_ext(dist)

        # making sure the suer option is there
        options = [name for name, short, lable in
                   cmd.user_options]
        self.assert_('user' in options)

        # setting a value
        cmd.user = 1

        # setting user based lib and include
        lib = os.path.join(site.USER_BASE, 'lib')
        incl = os.path.join(site.USER_BASE, 'include')
        os.mkdir(lib)
        os.mkdir(incl)

        # let's run finalize
        cmd.ensure_finalized()

        # see if include_dirs and library_dirs
        # were set
        self.assert_(lib in cmd.library_dirs)
        self.assert_(incl in cmd.include_dirs)

    def test_optional_extension(self):

        # this extension will fail, but let's ignore this failure
        # with the optional argument.
        modules = [Extension('foo', ['xxx'], optional=False)]
        dist = Distribution({'name': 'xx', 'ext_modules': modules})
        cmd = build_ext(dist)
        cmd.ensure_finalized()
        self.assertRaises((UnknownFileError, CompileError),
                          cmd.run)  # should raise an error

        modules = [Extension('foo', ['xxx'], optional=True)]
        dist = Distribution({'name': 'xx', 'ext_modules': modules})
        cmd = build_ext(dist)
        cmd.ensure_finalized()
        cmd.run()  # should pass

def test_suite():
    src = _get_source_filename()
    if not os.path.exists(src):
        if support.verbose:
            print('test_build_ext: Cannot find source code (test'
                  ' must run in python build dir)')
        return unittest.TestSuite()
    else: return unittest.makeSuite(BuildExtTestCase)

if __name__ == '__main__':
    support.run_unittest(test_suite())