# vim: set fileencoding=utf-8 :
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# NOTE: The fileencoding comment on the first line of the file is
# important; without it, Python will choke while trying to parse the file,
# since it includes non-ASCII characters.

import os
import stat
import sys
import tempfile
import unittest

from filesystem import FileSystem


class GenericFileSystemTests(object):
    """Tests that should pass on either a real or mock filesystem."""
    def setup_generic_test_dir(self):
        fs = self.fs
        self.generic_test_dir = str(self.fs.mkdtemp())
        self.orig_cwd = fs.getcwd()
        fs.chdir(self.generic_test_dir)
        fs.write_text_file('foo.txt', 'foo')
        fs.write_text_file('foobar', 'foobar')
        fs.maybe_make_directory('foodir')
        fs.write_text_file(fs.join('foodir', 'baz'), 'baz')
        fs.chdir(self.orig_cwd)

    def teardown_generic_test_dir(self):
        self.fs.rmtree(self.generic_test_dir)
        self.fs.chdir(self.orig_cwd)
        self.generic_test_dir = None

    def test_glob__trailing_asterisk(self):
        self.fs.chdir(self.generic_test_dir)
        self.assertEqual(set(self.fs.glob('fo*')), set(['foo.txt', 'foobar', 'foodir']))

    def test_glob__leading_asterisk(self):
        self.fs.chdir(self.generic_test_dir)
        self.assertEqual(set(self.fs.glob('*xt')), set(['foo.txt']))

    def test_glob__middle_asterisk(self):
        self.fs.chdir(self.generic_test_dir)
        self.assertEqual(set(self.fs.glob('f*r')), set(['foobar', 'foodir']))

    def test_glob__period_is_escaped(self):
        self.fs.chdir(self.generic_test_dir)
        self.assertEqual(set(self.fs.glob('foo.*')), set(['foo.txt']))


class RealFileSystemTest(unittest.TestCase, GenericFileSystemTests):
    def setUp(self):
        self.fs = FileSystem()
        self.setup_generic_test_dir()

        self._this_dir = os.path.dirname(os.path.abspath(__file__))
        self._missing_file = os.path.join(self._this_dir, 'missing_file.py')
        self._this_file = os.path.join(self._this_dir, 'filesystem_unittest.py')

    def tearDown(self):
        self.teardown_generic_test_dir()
        self.fs = None

    def test_chdir(self):
        fs = FileSystem()
        cwd = fs.getcwd()
        newdir = '/'
        if sys.platform.startswith('win'):
            newdir = 'c:\\'
        fs.chdir(newdir)
        self.assertEqual(fs.getcwd(), newdir)
        fs.chdir(cwd)

    def test_chdir__notexists(self):
        fs = FileSystem()
        newdir = '/dirdoesnotexist'
        if sys.platform.startswith('win'):
            newdir = 'c:\\dirdoesnotexist'
        self.assertRaises(OSError, fs.chdir, newdir)

    def test_exists__true(self):
        fs = FileSystem()
        self.assertTrue(fs.exists(self._this_file))

    def test_exists__false(self):
        fs = FileSystem()
        self.assertFalse(fs.exists(self._missing_file))

    def test_getcwd(self):
        fs = FileSystem()
        self.assertTrue(fs.exists(fs.getcwd()))

    def test_isdir__true(self):
        fs = FileSystem()
        self.assertTrue(fs.isdir(self._this_dir))

    def test_isdir__false(self):
        fs = FileSystem()
        self.assertFalse(fs.isdir(self._this_file))

    def test_join(self):
        fs = FileSystem()
        self.assertEqual(fs.join('foo', 'bar'),
                         os.path.join('foo', 'bar'))

    def test_listdir(self):
        fs = FileSystem()
        with fs.mkdtemp(prefix='filesystem_unittest_') as d:
            self.assertEqual(fs.listdir(d), [])
            new_file = os.path.join(d, 'foo')
            fs.write_text_file(new_file, u'foo')
            self.assertEqual(fs.listdir(d), ['foo'])
            os.remove(new_file)

    def test_maybe_make_directory__success(self):
        fs = FileSystem()

        with fs.mkdtemp(prefix='filesystem_unittest_') as base_path:
            sub_path = os.path.join(base_path, "newdir")
            self.assertFalse(os.path.exists(sub_path))
            self.assertFalse(fs.isdir(sub_path))

            fs.maybe_make_directory(sub_path)
            self.assertTrue(os.path.exists(sub_path))
            self.assertTrue(fs.isdir(sub_path))

            # Make sure we can re-create it.
            fs.maybe_make_directory(sub_path)
            self.assertTrue(os.path.exists(sub_path))
            self.assertTrue(fs.isdir(sub_path))

            # Clean up.
            os.rmdir(sub_path)

        self.assertFalse(os.path.exists(base_path))
        self.assertFalse(fs.isdir(base_path))

    def test_maybe_make_directory__failure(self):
        # FIXME: os.chmod() doesn't work on Windows to set directories
        # as readonly, so we skip this test for now.
        if sys.platform.startswith('win') or sys.platform == 'cygwin':
            return

        fs = FileSystem()
        with fs.mkdtemp(prefix='filesystem_unittest_') as d:
            # Remove write permissions on the parent directory.
            os.chmod(d, stat.S_IRUSR)

            # Now try to create a sub directory - should fail.
            sub_dir = fs.join(d, 'subdir')
            self.assertRaises(OSError, fs.maybe_make_directory, sub_dir)

            # Clean up in case the test failed and we did create the
            # directory.
            if os.path.exists(sub_dir):
                os.rmdir(sub_dir)

    def test_read_and_write_text_file(self):
        fs = FileSystem()
        text_path = None

        unicode_text_string = u'\u016An\u012Dc\u014Dde\u033D'
        try:
            text_path = tempfile.mktemp(prefix='tree_unittest_')
            file = fs.open_text_file_for_writing(text_path)
            file.write(unicode_text_string)
            file.close()

            file = fs.open_text_file_for_reading(text_path)
            read_text = file.read()
            file.close()

            self.assertEqual(read_text, unicode_text_string)
        finally:
            if text_path and fs.isfile(text_path):
                os.remove(text_path)

    def test_append_to_text_file(self):
        fs = FileSystem()
        text_path = None

        unicode_text_string1 = u'\u016An\u012Dc\u014Dde\u033D'
        unicode_text_string2 = 'Hello'
        try:
            text_path = tempfile.mktemp(prefix='tree_unittest_')
            file = fs.open_text_file_for_writing(text_path)
            file.write(unicode_text_string1)
            file.close()

            file = fs.open_text_file_for_writing(text_path, should_append=True)
            file.write(unicode_text_string2)
            file.close()

            file = fs.open_text_file_for_reading(text_path)
            read_text = file.read()
            file.close()

            self.assertEqual(read_text, unicode_text_string1 + unicode_text_string2)
        finally:
            if text_path and fs.isfile(text_path):
                os.remove(text_path)

    def test_read_and_write_file(self):
        fs = FileSystem()
        text_path = None
        binary_path = None

        unicode_text_string = u'\u016An\u012Dc\u014Dde\u033D'
        hex_equivalent = '\xC5\xAA\x6E\xC4\xAD\x63\xC5\x8D\x64\x65\xCC\xBD'
        malformed_text_hex = '\x4D\x69\x63\x72\x6F\x73\x6F\x66\x74\xAE\x20\x56\x69\x73\x75\x61\x6C\x20\x53\x74\x75\x64\x69\x6F\xAE\x20\x32\x30\x31\x30\x0D\x0A'
        malformed_ignored_text_hex = '\x4D\x69\x63\x72\x6F\x73\x6F\x66\x74\x20\x56\x69\x73\x75\x61\x6C\x20\x53\x74\x75\x64\x69\x6F\x20\x32\x30\x31\x30\x0D\x0A'
        try:
            text_path = tempfile.mktemp(prefix='tree_unittest_')
            binary_path = tempfile.mktemp(prefix='tree_unittest_')
            fs.write_text_file(text_path, unicode_text_string)
            contents = fs.read_binary_file(text_path)
            self.assertEqual(contents, hex_equivalent)

            fs.write_binary_file(binary_path, hex_equivalent)
            text_contents = fs.read_text_file(binary_path)
            self.assertEqual(text_contents, unicode_text_string)

            self.assertRaises(ValueError, fs.write_text_file, binary_path, malformed_text_hex)
            fs.write_binary_file(binary_path, malformed_text_hex)
            self.assertRaises(ValueError, fs.read_text_file, binary_path)
            text_contents = fs.read_binary_file(binary_path).decode('utf8', 'ignore')
            self.assertEquals(text_contents, malformed_ignored_text_hex)
            fs.open_text_file_for_reading(binary_path, 'replace').readline()

        finally:
            if text_path and fs.isfile(text_path):
                os.remove(text_path)
            if binary_path and fs.isfile(binary_path):
                os.remove(binary_path)

    def test_read_binary_file__missing(self):
        fs = FileSystem()
        self.assertRaises(IOError, fs.read_binary_file, self._missing_file)

    def test_read_text_file__missing(self):
        fs = FileSystem()
        self.assertRaises(IOError, fs.read_text_file, self._missing_file)

    def test_remove_file_with_retry(self):
        RealFileSystemTest._remove_failures = 2

        def remove_with_exception(filename):
            RealFileSystemTest._remove_failures -= 1
            if RealFileSystemTest._remove_failures >= 0:
                try:
                    raise WindowsError
                except NameError:
                    raise FileSystem._WindowsError

        fs = FileSystem()
        self.assertTrue(fs.remove('filename', remove_with_exception))
        self.assertEqual(-1, RealFileSystemTest._remove_failures)

    def test_sep(self):
        fs = FileSystem()

        self.assertEqual(fs.sep, os.sep)
        self.assertEqual(fs.join("foo", "bar"),
                          os.path.join("foo", "bar"))

    def test_dirs_under(self):
        fs = FileSystem()
        parentDir = fs.normpath(fs.join(self._this_dir, ".."))

        self.assertTrue(self._this_dir in fs.dirs_under(parentDir))

        def filter_no_dir(fs, dirpath):
            return False
        self.assertEqual(len(fs.dirs_under(parentDir, filter_no_dir)), 0)

        def filter_this_dir(fs, dirpath):
            return dirpath != self._this_dir
        self.assertFalse(self._this_dir in fs.dirs_under(parentDir, filter_this_dir))
