import cStringIO
import json
import logging

from nova import context
from nova import flags
from nova import log
from nova import test

FLAGS = flags.FLAGS


def _fake_context():
    return context.RequestContext(1, 1)


class LoggerTestCase(test.TestCase):
    def setUp(self):
        super(LoggerTestCase, self).setUp()
        self.log = log.getLogger()

    def test_handlers_have_nova_formatter(self):
        formatters = []
        for h in self.log.logger.handlers:
            f = h.formatter
            if isinstance(f, log.LegacyNovaFormatter):
                formatters.append(f)
        self.assert_(formatters)
        self.assertEqual(len(formatters), len(self.log.logger.handlers))

    def test_handles_context_kwarg(self):
        self.log.info("foo", context=_fake_context())
        self.assert_(True)  # didn't raise exception

    def test_audit_handles_context_arg(self):
        self.log.audit("foo", context=_fake_context())
        self.assert_(True)  # didn't raise exception

    def test_will_be_verbose_if_verbose_flag_set(self):
        self.flags(verbose=True)
        log.setup()
        self.assertEqual(logging.DEBUG, self.log.logger.getEffectiveLevel())

    def test_will_not_be_verbose_if_verbose_flag_not_set(self):
        self.flags(verbose=False)
        log.setup()
        self.assertEqual(logging.INFO, self.log.logger.getEffectiveLevel())

    def test_no_logging_via_module(self):
        for func in ('critical', 'error', 'exception', 'warning', 'warn',
                     'info', 'debug', 'log', 'audit'):
            self.assertRaises(AttributeError, getattr, log, func)


class LogHandlerTestCase(test.TestCase):
    def test_log_path_logdir(self):
        self.flags(logdir='/some/path', logfile=None)
        self.assertEquals(log._get_log_file_path(binary='foo-bar'),
                         '/some/path/foo-bar.log')

    def test_log_path_logfile(self):
        self.flags(logfile='/some/path/foo-bar.log')
        self.assertEquals(log._get_log_file_path(binary='foo-bar'),
                         '/some/path/foo-bar.log')

    def test_log_path_none(self):
        self.flags(logdir=None, logfile=None)
        self.assertTrue(log._get_log_file_path(binary='foo-bar') is None)

    def test_log_path_logfile_overrides_logdir(self):
        self.flags(logdir='/some/other/path',
                   logfile='/some/path/foo-bar.log')
        self.assertEquals(log._get_log_file_path(binary='foo-bar'),
                         '/some/path/foo-bar.log')


class NovaFormatterTestCase(test.TestCase):
    def setUp(self):
        super(NovaFormatterTestCase, self).setUp()
        self.flags(logging_context_format_string="HAS CONTEXT "
                                                 "[%(request_id)s]: "
                                                 "%(message)s",
                   logging_default_format_string="NOCTXT: %(message)s",
                   logging_debug_format_suffix="--DBG")
        self.log = log.getLogger()
        self.stream = cStringIO.StringIO()
        self.handler = logging.StreamHandler(self.stream)
        self.handler.setFormatter(log.LegacyNovaFormatter())
        self.log.logger.addHandler(self.handler)
        self.level = self.log.logger.getEffectiveLevel()
        self.log.logger.setLevel(logging.DEBUG)

    def tearDown(self):
        self.log.logger.setLevel(self.level)
        self.log.logger.removeHandler(self.handler)
        super(NovaFormatterTestCase, self).tearDown()

    def test_uncontextualized_log(self):
        self.log.info("foo")
        self.assertEqual("NOCTXT: foo\n", self.stream.getvalue())

    def test_contextualized_log(self):
        ctxt = _fake_context()
        self.log.info("bar", context=ctxt)
        expected = "HAS CONTEXT [%s]: bar\n" % ctxt.request_id
        self.assertEqual(expected, self.stream.getvalue())

    def test_debugging_log(self):
        self.log.debug("baz")
        self.assertEqual("NOCTXT: baz --DBG\n", self.stream.getvalue())


class NovaLoggerTestCase(test.TestCase):
    def setUp(self):
        super(NovaLoggerTestCase, self).setUp()
        levels = FLAGS.default_log_levels
        levels.append("nova-test=AUDIT")
        self.flags(default_log_levels=levels,
                   verbose=True)
        log.setup()
        self.log = log.getLogger('nova-test')

    def test_has_level_from_flags(self):
        self.assertEqual(logging.AUDIT, self.log.logger.getEffectiveLevel())

    def test_child_log_has_level_of_parent_flag(self):
        l = log.getLogger('nova-test.foo')
        self.assertEqual(logging.AUDIT, l.logger.getEffectiveLevel())


class JSONFormatterTestCase(test.TestCase):
    def setUp(self):
        super(JSONFormatterTestCase, self).setUp()
        self.log = log.getLogger('test-json')
        self.stream = cStringIO.StringIO()
        handler = logging.StreamHandler(self.stream)
        handler.setFormatter(log.JSONFormatter())
        self.log.logger.addHandler(handler)
        self.log.logger.setLevel(logging.DEBUG)

    def test_json(self):
        test_msg = 'This is a %(test)s line'
        test_data = {'test': 'log'}
        self.log.debug(test_msg, test_data)

        data = json.loads(self.stream.getvalue())
        self.assertTrue(data)
        self.assertTrue('extra' in data)
        self.assertEqual('test-json', data['name'])

        self.assertEqual(test_msg % test_data, data['message'])
        self.assertEqual(test_msg, data['msg'])
        self.assertEqual(test_data, data['args'])

        self.assertEqual('test_log.py', data['filename'])
        self.assertEqual('test_json', data['funcname'])

        self.assertEqual('DEBUG', data['levelname'])
        self.assertEqual(logging.DEBUG, data['levelno'])
        self.assertFalse(data['traceback'])

    def test_json_exception(self):
        test_msg = 'This is %s'
        test_data = 'exceptional'
        try:
            raise Exception('This is exceptional')
        except Exception:
            self.log.exception(test_msg, test_data)

        data = json.loads(self.stream.getvalue())
        self.assertTrue(data)
        self.assertTrue('extra' in data)
        self.assertEqual('test-json', data['name'])

        self.assertEqual(test_msg % test_data, data['message'])
        self.assertEqual(test_msg, data['msg'])
        self.assertEqual([test_data], data['args'])

        self.assertEqual('ERROR', data['levelname'])
        self.assertEqual(logging.ERROR, data['levelno'])
        self.assertTrue(data['traceback'])