# encoding: utf-8
"""Tests for IPython.utils.module_paths.py"""

#-----------------------------------------------------------------------------
#  Copyright (C) 2008-2011  The IPython Development Team
#
#  Distributed under the terms of the BSD License.  The full license is in
#  the file COPYING, distributed as part of this software.
#-----------------------------------------------------------------------------

#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------


import os
import shutil
import sys
import tempfile

from os.path import join, abspath, split

from IPython.testing.tools import make_tempfile

import IPython.utils.module_paths as mp

import nose.tools as nt

env = os.environ
TEST_FILE_PATH = split(abspath(__file__))[0]
TMP_TEST_DIR = tempfile.mkdtemp()
#
# Setup/teardown functions/decorators
#

old_syspath = sys.path

def make_empty_file(fname):
    f = open(fname, 'w')
    f.close()


def setup():
    """Setup testenvironment for the module:

    """
    # Do not mask exceptions here.  In particular, catching WindowsError is a
    # problem because that exception is only defined on Windows...
    os.makedirs(join(TMP_TEST_DIR, "xmod"))
    os.makedirs(join(TMP_TEST_DIR, "nomod"))
    make_empty_file(join(TMP_TEST_DIR, "xmod/__init__.py"))
    make_empty_file(join(TMP_TEST_DIR, "xmod/sub.py"))
    make_empty_file(join(TMP_TEST_DIR, "pack.py"))
    make_empty_file(join(TMP_TEST_DIR, "packpyc.pyc"))
    sys.path = [TMP_TEST_DIR]

def teardown():
    """Teardown testenvironment for the module:

            - Remove tempdir
            - restore sys.path
    """
    # Note: we remove the parent test dir, which is the root of all test
    # subdirs we may have created.  Use shutil instead of os.removedirs, so
    # that non-empty directories are all recursively removed.
    shutil.rmtree(TMP_TEST_DIR)
    sys.path = old_syspath

def test_find_mod_1():
    """
    Search for a directory's file path.
    Expected output: a path to that directory's __init__.py file.
    """
    modpath = join(TMP_TEST_DIR, "xmod", "__init__.py")
    nt.assert_equal(mp.find_mod("xmod"), modpath)

def test_find_mod_2():
    """
    Search for a directory's file path.
    Expected output: a path to that directory's __init__.py file.
    TODO: Confirm why this is a duplicate test.
    """
    modpath = join(TMP_TEST_DIR, "xmod", "__init__.py")
    nt.assert_equal(mp.find_mod("xmod"), modpath)

def test_find_mod_3():
    """
    Search for a directory + a filename without its .py extension
    Expected output: full path with .py extension.
    """
    modpath = join(TMP_TEST_DIR, "xmod", "sub.py")
    nt.assert_equal(mp.find_mod("xmod.sub"), modpath)

def test_find_mod_4():
    """
    Search for a filename without its .py extension
    Expected output: full path with .py extension
    """
    modpath = join(TMP_TEST_DIR, "pack.py")
    nt.assert_equal(mp.find_mod("pack"), modpath)

def test_find_mod_5():
    """
    Search for a filename with a .pyc extension
    Expected output: TODO: do we exclude or include .pyc files?
    """
    nt.assert_equal(mp.find_mod("packpyc"), None)
