import logging
import os
import tempfile
from south.tests import unittest
import StringIO
import sys

from django.conf import settings
from django.db import connection, models

from south.db import db
from south.logger import close_logger

class TestLogger(unittest.TestCase):

    """
    Tests if the logging is working reasonably. Some tests ignored if you don't
    have write permission to the disk.
    """
    
    def setUp(self):
        db.debug = False
        self.test_path = tempfile.mkstemp(suffix=".south.log")[1]
    
    def test_db_execute_logging_nofile(self):
        "Does logging degrade nicely if SOUTH_LOGGING_ON not set?"
        settings.SOUTH_LOGGING_ON = False     # this needs to be set to False
                                              # to avoid issues where other tests
                                              # set this to True. settings is shared
                                              # between these tests.
        db.create_table("test9", [('email_confirmed', models.BooleanField(default=False))])

    def test_db_execute_logging_off_with_basic_config(self):
        """
        Does the south logger avoid outputing debug information with
        south logging turned off and python logging configured with
        a basic config?"
        """
        settings.SOUTH_LOGGING_ON = False

        # Set root logger to capture WARNING and worse
        logging_stream = StringIO.StringIO()
        logging.basicConfig(stream=logging_stream, level=logging.WARNING)

        db.create_table("test12", [('email_confirmed', models.BooleanField(default=False))])

        # since south logging is off, and our root logger is at WARNING
        # we should not find DEBUG info in the log
        self.assertEqual(logging_stream.getvalue(), '')

    def test_db_execute_logging_validfile(self):
        "Does logging work when passing in a valid file?"
        settings.SOUTH_LOGGING_ON = True
        settings.SOUTH_LOGGING_FILE = self.test_path
        # Check to see if we can make the logfile
        try:
            fh = open(self.test_path, "w")
        except IOError:
            # Permission was denied, ignore the test.
            return
        else:
            fh.close()
        # Do an action which logs
        db.create_table("test10", [('email_confirmed', models.BooleanField(default=False))])
        # Close the logged file
        close_logger()
        try:
            os.remove(self.test_path)
        except:
            # It's a tempfile, it's not vital we remove it.
            pass

    def test_db_execute_logging_missingfilename(self):
        "Does logging raise an error if there is a missing filename?"
        settings.SOUTH_LOGGING_ON = True
        settings.SOUTH_LOGGING_FILE = None
        self.assertRaises(
            IOError,
            db.create_table,
            "test11",
            [('email_confirmed', models.BooleanField(default=False))],
        )
