# 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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#
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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
from webkitpy.common.system import logutils


class GetLoggerTest(unittest.TestCase):

    """Tests get_logger()."""

    def test_get_logger_in_webkitpy(self):
        logger = logutils.get_logger(__file__)
        self.assertEqual(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("/tools/test-webkitpy")
        self.assertEqual(logger.name, "test-webkitpy")

        logger = logutils.get_logger("/tools/test-webkitpy.py")
        self.assertEqual(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(["test message\n"])

    def test_debug_message(self):
        self._log.debug("test message")
        self._assert_log_messages([])

    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(["message1\n",
                                   "message2\n"])


class ConfigureLoggingVerboseTest(ConfigureLoggingTestBase):
    def _logging_level(self):
        return logging.DEBUG

    def test_info_message(self):
        self._log.info("test message")
        self._assert_log_messages(["unittest: [INFO] test message\n"])

    def test_debug_message(self):
        self._log.debug("test message")
        self._assert_log_messages(["unittest: [DEBUG] test message\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(["test message\n"])

    def test_below_threshold_message(self):
        self._log.log(self._level - 1, "test message")
        self._assert_log_messages([])