import logging
import os
import sys
import unittest
import nose.plugins
from optparse import OptionParser
import tempfile
from warnings import warn, filterwarnings, resetwarnings

from nose import SkipTest
from nose.pyversion import unbound_method
from nose.config import Config
from nose.plugins.attrib import AttributeSelector
from nose.plugins.base import Plugin
from nose.plugins.cover import Coverage
from nose.plugins.doctests import Doctest
from nose.plugins.failuredetail import FailureDetail
from nose.plugins.prof import Profile

from mock import *

class P(Plugin):
    """Plugin of destiny!"""    
    pass

class ErrPlugin(object):
    def load(self):
        raise Exception("Failed to load the plugin")
    
class ErrPkgResources(object):
    def iter_entry_points(self, ep):
        yield ErrPlugin()

        
# some plugins have 2.4-only features
compat_24 = sys.version_info >= (2, 4)


class TestBuiltinPlugins(unittest.TestCase):

    def setUp(self):
        self.p = sys.path[:]

    def tearDown(self):
        sys.path = self.p[:]
                
    def test_add_options(self):
        conf = Config()
        opt = Bucket()
        parser = MockOptParser()
        plug = P()

        plug.add_options(parser)
        o, d = parser.opts[0]
        # print d
        assert o[0] == '--with-p'
        assert d['action'] == 'store_true'
        assert not d['default']
        assert d['dest'] == 'enable_plugin_p'
        assert d['help'] == 'Enable plugin P: Plugin of destiny! [NOSE_WITH_P]'

        opt.enable_plugin_p = True
        plug.configure(opt, conf)
        assert plug.enabled

        
class TestDoctestPlugin(unittest.TestCase):

    def setUp(self):
        self.p = sys.path[:]

    def tearDown(self):
        sys.path = self.p[:]
    
    def test_add_options(self):
        # doctest plugin adds some options...
        conf = Config()
        opt = Bucket()
        parser = MockOptParser()
        plug = Doctest()
        
        plug.add_options(parser, {})
        o, d = parser.opts[0]
        assert o[0] == '--with-doctest'

        o2, d2 = parser.opts[1]
        assert o2[0] == '--doctest-tests'
        
        o3, d3 = parser.opts[2]
        assert o3[0] == '--doctest-extension'

    def test_config(self):
        # test that configuration works properly when both environment
        # and command line specify a doctest extension
        parser = OptionParser()
        env = {'NOSE_DOCTEST_EXTENSION':'ext'}
        argv = ['--doctest-extension', 'txt']
        dtp = Doctest()
        dtp.add_options(parser, env)
        options, args = parser.parse_args(argv)
        
        print(options)
        print(args)
        self.assertEqual(options.doctestExtension, ['ext', 'txt'])

        env = {}
        parser = OptionParser()
        dtp.add_options(parser, env)
        options, args = parser.parse_args(argv)
        print(options)
        print(args)
        self.assertEqual(options.doctestExtension, ['txt'])
            
    def test_want_file(self):
        # doctest plugin can select module and/or non-module files
        conf = Config()
        opt = Bucket()
        plug = Doctest()
        plug.can_configure = True
        plug.configure(opt, conf)
        
        assert plug.wantFile('foo.py')
        assert not plug.wantFile('bar.txt')
        assert not plug.wantFile('buz.rst')
        assert not plug.wantFile('bing.mov')
        
        plug.extension = ['.txt', '.rst']
        assert plug.wantFile('/path/to/foo.py')
        assert plug.wantFile('/path/to/bar.txt')
        assert plug.wantFile('/path/to/buz.rst')
        assert not plug.wantFile('/path/to/bing.mov')
        
    def test_matches(self):
        # doctest plugin wants tests from all NON-test modules
        conf = Config()
        opt = Bucket()
        plug = Doctest()
        plug.can_configure = True
        plug.configure(opt, conf)
        assert not plug.matches('test')
        assert plug.matches('foo')

    def test_collect_pymodule(self):
        here = os.path.dirname(__file__)
        support = os.path.join(here, 'support')
        if not support in sys.path:
            sys.path.insert(0, support)
        import foo.bar.buz
        
        conf = Config()
        opt = Bucket()
        plug = Doctest()
        plug.can_configure = True
        plug.configure(opt, conf)
        suite = plug.loadTestsFromModule(foo.bar.buz)        
        expect = ['[afunc (foo.bar.buz)]']
        for test in suite:
            self.assertEqual(str(test), expect.pop(0))

    def test_addresses(self):
        here = os.path.dirname(__file__)
        support = os.path.join(here, 'support')
        if not support in sys.path:
            sys.path.insert(0, support)
        import foo.bar.buz
        
        conf = Config()
        opt = Bucket()
        plug = Doctest()
        plug.can_configure = True
        plug.configure(opt, conf)
        suite = plug.loadTestsFromModule(foo.bar.buz)
        for test in suite:
            print(test.address())
            file, mod, call = test.address()
            self.assertEqual(mod, 'foo.bar.buz')
            self.assertEqual(call, None)
            for case in test:
                print(case.address())
                file, mod, call = case.address()
                self.assertEqual(mod, 'foo.bar.buz')
                self.assertEqual(call, 'afunc')
            
    def test_collect_txtfile(self):
        here = os.path.abspath(os.path.dirname(__file__))
        support = os.path.join(here, 'support')
        fn = os.path.join(support, 'foo', 'doctests.txt')
        
        conf = Config()        
        opt = Bucket()
        plug = Doctest()
        plug.can_configure = True
        plug.configure(opt, conf)
        plug.extension = ['.txt']
        suite = plug.loadTestsFromFile(fn)
        for test in suite:
            assert str(test).endswith('doctests.txt')
            assert test.address(), "Test %s has no address"
        
    def test_collect_no_collect(self):
        # bug http://nose.python-hosting.com/ticket/55 
        # we got "iteration over non-sequence" when no files match
        here = os.path.abspath(os.path.dirname(__file__))
        support = os.path.join(here, 'support')
        plug = Doctest()
        for test in plug.loadTestsFromFile(os.path.join(support, 'foo')):
            self.fail("Expected no tests, got %s" % test)


class TestAttribPlugin(unittest.TestCase):

    def test_add_options(self):
        plug = AttributeSelector()
        parser = MockOptParser()
        plug.add_options(parser)

        expect = [(('-a', '--attr'),
                   {'dest': 'attr', 'action': 'append', 'default': None,
                    'metavar': 'ATTR',
                    'help': 'Run only tests that have attributes '
                    'specified by ATTR [NOSE_ATTR]'})]

        if compat_24:
            expect.append(
                (('-A', '--eval-attr'),
                 {'dest': 'eval_attr', 'action': 'append',
                  'default': None, 'metavar': 'EXPR',
                  'help': 'Run only tests for whose attributes the '
                  'Python expression EXPR evaluates to True '
                  '[NOSE_EVAL_ATTR]'}))
        self.assertEqual(parser.opts, expect)

        opt = Bucket()
        opt.attr = ['!slow']
        plug.configure(opt, Config())
        assert plug.enabled
        self.assertEqual(plug.attribs, [[('slow', False)]])

        opt.attr = ['fast,quick', 'weird=66']
        plug.configure(opt, Config())
        self.assertEqual(plug.attribs, [[('fast', True),
                                         ('quick', True)],
                                        [('weird', '66')]])

        # don't die on trailing ,
        opt.attr = [ 'something,' ]
        plug.configure(opt, Config())
        self.assertEqual(plug.attribs, [[('something', True)]] )
        
        if compat_24:
            opt.attr = None
            opt.eval_attr = [ 'weird >= 66' ]
            plug.configure(opt, Config())
            self.assertEqual(plug.attribs[0][0][0], 'weird >= 66')
            assert callable(plug.attribs[0][0][1])
                       
    def test_basic_attr(self):
        def f():
            pass
        f.a = 1

        def g():
            pass
    
        plug = AttributeSelector()
        plug.attribs = [[('a', True)]]
        assert plug.wantFunction(f) is not False
        assert not plug.wantFunction(g)

    def test_class_attr(self):
        class TestP:
            foo = True
            def h():
                pass

        def i():
            pass
        
        plug = AttributeSelector()
        plug.attribs = [[('foo', True)]]
        assert plug.wantMethod(unbound_method(TestP, TestP.h)) is not False
        assert plug.wantFunction(i) is False
        
    def test_eval_attr(self):
        if not compat_24:
            warn("No support for eval attributes in python versions older"
                 " than 2.4")
            return
        def f():
            pass
        f.monkey = 2
        
        def g():
            pass
        g.monkey = 6

        def h():
            pass
        h.monkey = 5
        
        cnf = Config()
        opt = Bucket()
        opt.eval_attr = "monkey > 5"
        plug = AttributeSelector()
        plug.configure(opt, cnf)

        assert not plug.wantFunction(f)
        assert plug.wantFunction(g) is not False
        assert not plug.wantFunction(h)

    def test_attr_a_b(self):
        def f1():
            pass
        f1.tags = ['a', 'b']

        def f2():
            pass
        f2.tags = ['a', 'c']

        def f3():
            pass
        f3.tags = ['b', 'c']

        def f4():
            pass
        f4.tags = ['c', 'd']
        
        cnf = Config()
        parser = OptionParser()
        plug = AttributeSelector()

        plug.add_options(parser)

        # OR
        opt, args = parser.parse_args(['test', '-a', 'tags=a',
                                       '-a', 'tags=b'])
        print(opt)
        plug.configure(opt, cnf)

        assert plug.wantFunction(f1) is None
        assert plug.wantFunction(f2) is None
        assert plug.wantFunction(f3) is None
        assert not plug.wantFunction(f4)

        # AND
        opt, args = parser.parse_args(['test', '-a', 'tags=a,tags=b'])
        print(opt)
        plug.configure(opt, cnf)

        assert plug.wantFunction(f1) is None
        assert not plug.wantFunction(f2)
        assert not plug.wantFunction(f3)
        assert not plug.wantFunction(f4)
        

class TestFailureDetailPlugin(unittest.TestCase):

    def test_formatFailure(self):
        class DummyError(Exception):
            pass

        try:
            raise DummyError
        except DummyError:
            exc_info = sys.exc_info()

        plug = FailureDetail()
        (ec, ev, tb) = plug.formatFailure(self, exc_info)
        assert exc_info[0] is ec
        assert exc_info[2] is tb
        assert self.tbinfo is not None

        exc_info = (exc_info[0], exc_info[1], None) # Try without traceback
        (ec, ev, tb) = plug.formatFailure(self, exc_info)
        assert self.tbinfo is None


class TestProfPlugin(unittest.TestCase):

    def setUp(self):        
        if not Profile.available():
            raise SkipTest('profile plugin not available; skipping')

    def test_options(self):
        parser = OptionParser()
        conf = Config()
        plug = Profile()

        plug.add_options(parser, {})
        opts = [ o._long_opts[0] for o in parser.option_list ]
        assert '--profile-sort' in opts
        assert '--profile-stats-file' in opts
        assert '--with-profile' in opts
        assert '--profile-restrict' in opts

    def test_begin(self):
        plug = Profile()
        plug.pfile = tempfile.mkstemp()[1]
        try:
            plug.begin()
            assert plug.prof
        finally:
            plug.finalize(None)

    def test_prepare_test(self):
        r = {}
        class dummy:
            def runcall(self, f, r):
                r[1] = f(), "wrapped"
        def func():
            return "func"
        
        plug = Profile()
        plug.prof = dummy()
        result = plug.prepareTest(func)
        try:
            result(r)
            assert r[1] == ("func", "wrapped")
        finally:
            plug.finalize(None)

    def test_finalize(self):
        def func():
            pass

        plug = Profile()
        plug.begin()
        plug.prepareTest(func)
        pfile = plug.pfile
        try:
            assert os.path.exists(pfile)
        finally:
            plug.finalize(None)
        assert not os.path.exists(pfile), \
               "finalize did not remove temp file %s" % pfile

if __name__ == '__main__':
    unittest.main()
