# Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

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# 1.  Redistributions of source code must retain the above copyright

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#     documentation and/or other materials provided with the distribution.

#

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"""Unit tests for logutils.py."""

import logging

import os

import unittest

from webkitpy.common.system.logtesting import LogTesting

from webkitpy.common.system.logtesting import TestLogStream

import webkitpy.common.system.logutils as logutils

class GetLoggerTest(unittest.TestCase):

    """Tests get_logger()."""

    def test_get_logger_in_webkitpy(self):

        logger = logutils.get_logger(__file__)

        self.assertEquals(logger.name, "webkitpy.common.system.logutils_unittest")

    def test_get_logger_not_in_webkitpy(self):

        # Temporarily change the working directory so that we

        # can test get_logger() for a path outside of webkitpy.

        working_directory = os.getcwd()

        root_dir = "/"

        os.chdir(root_dir)

        logger = logutils.get_logger("/WebKitTools/Scripts/test-webkitpy")

        self.assertEquals(logger.name, "test-webkitpy")

        logger = logutils.get_logger("/WebKitTools/Scripts/test-webkitpy.py")

        self.assertEquals(logger.name, "test-webkitpy")

        os.chdir(working_directory)

class ConfigureLoggingTestBase(unittest.TestCase):

    """Base class for configure_logging() unit tests."""

    def _logging_level(self):

        raise Exception("Not implemented.")

    def setUp(self):

        log_stream = TestLogStream(self)

        # Use a logger other than the root logger or one prefixed with

        # "webkitpy." so as not to conflict with test-webkitpy logging.

        logger = logging.getLogger("unittest")

        # Configure the test logger not to pass messages along to the

        # root logger.  This prevents test messages from being

        # propagated to loggers used by test-webkitpy logging (e.g.

        # the root logger).

        logger.propagate = False

        logging_level = self._logging_level()

        self._handlers = logutils.configure_logging(logging_level=logging_level,

                                                    logger=logger,

                                                    stream=log_stream)

        self._log = logger

        self._log_stream = log_stream

    def tearDown(self):

        """Reset logging to its original state.

        This method ensures that the logging configuration set up

        for a unit test does not affect logging in other unit tests.

        """

        logger = self._log

        for handler in self._handlers:

            logger.removeHandler(handler)

    def _assert_log_messages(self, messages):

        """Assert that the logged messages equal the given messages."""

        self._log_stream.assertMessages(messages)

class ConfigureLoggingTest(ConfigureLoggingTestBase):

    """Tests configure_logging() with the default logging level."""

    def _logging_level(self):

        return None

    def test_info_message(self):

        self._log.info("test message")

        self._assert_log_messages(["unittest: [INFO] test message\n"])

    def test_below_threshold_message(self):

        # We test the boundary case of a logging level equal to 19.

        # In practice, we will probably only be calling log.debug(),

        # which corresponds to a logging level of 10.

        level = logging.INFO - 1  # Equals 19.

        self._log.log(level, "test message")

        self._assert_log_messages([])

    def test_two_messages(self):

        self._log.info("message1")

        self._log.info("message2")

        self._assert_log_messages(["unittest: [INFO] message1\n",

                                   "unittest: [INFO] message2\n"])

class ConfigureLoggingCustomLevelTest(ConfigureLoggingTestBase):

    """Tests configure_logging() with a custom logging level."""

    _level = 36

    def _logging_level(self):

        return self._level

    def test_logged_message(self):

        self._log.log(self._level, "test message")

        self._assert_log_messages(["unittest: [Level 36] test message\n"])

    def test_below_threshold_message(self):

        self._log.log(self._level - 1, "test message")

        self._assert_log_messages([])