# -*- coding: utf-8 -*-
import os
import shutil
import sys
import tempfile
import time
from datetime import datetime, timedelta
try:
    from cStringIO import StringIO
except ImportError:
    from StringIO import StringIO

try:
    import threading
except ImportError:
    import dummy_threading as threading

from django.conf import settings
from django.core.exceptions import SuspiciousOperation, ImproperlyConfigured
from django.core.files.base import ContentFile, File
from django.core.files.images import get_image_dimensions
from django.core.files.storage import FileSystemStorage, get_storage_class
from django.core.files.uploadedfile import UploadedFile
from django.utils import unittest

# Try to import PIL in either of the two ways it can end up installed.
# Checking for the existence of Image is enough for CPython, but
# for PyPy, you need to check for the underlying modules
try:
    from PIL import Image, _imaging
except ImportError:
    try:
        import Image, _imaging
    except ImportError:
        Image = None


class GetStorageClassTests(unittest.TestCase):
    def assertRaisesErrorWithMessage(self, error, message, callable,
        *args, **kwargs):
        self.assertRaises(error, callable, *args, **kwargs)
        try:
            callable(*args, **kwargs)
        except error, e:
            self.assertEqual(message, str(e))

    def test_get_filesystem_storage(self):
        """
        get_storage_class returns the class for a storage backend name/path.
        """
        self.assertEqual(
            get_storage_class('django.core.files.storage.FileSystemStorage'),
            FileSystemStorage)

    def test_get_invalid_storage_module(self):
        """
        get_storage_class raises an error if the requested import don't exist.
        """
        self.assertRaisesErrorWithMessage(
            ImproperlyConfigured,
            "NonExistingStorage isn't a storage module.",
            get_storage_class,
            'NonExistingStorage')

    def test_get_nonexisting_storage_class(self):
        """
        get_storage_class raises an error if the requested class don't exist.
        """
        self.assertRaisesErrorWithMessage(
            ImproperlyConfigured,
            'Storage module "django.core.files.storage" does not define a '\
                '"NonExistingStorage" class.',
            get_storage_class,
            'django.core.files.storage.NonExistingStorage')

    def test_get_nonexisting_storage_module(self):
        """
        get_storage_class raises an error if the requested module don't exist.
        """
        # Error message may or may not be the fully qualified path.
        self.assertRaisesRegexp(
            ImproperlyConfigured,
            ('Error importing storage module django.core.files.non_existing_'
                'storage: "No module named .*non_existing_storage"'),
            get_storage_class,
            'django.core.files.non_existing_storage.NonExistingStorage'
        )

class FileStorageTests(unittest.TestCase):
    storage_class = FileSystemStorage

    def setUp(self):
        self.temp_dir = tempfile.mktemp()
        os.makedirs(self.temp_dir)
        self.storage = self.storage_class(location=self.temp_dir,
            base_url='/test_media_url/')

    def tearDown(self):
        shutil.rmtree(self.temp_dir)

    def test_file_access_options(self):
        """
        Standard file access options are available, and work as expected.
        """
        self.assertFalse(self.storage.exists('storage_test'))
        f = self.storage.open('storage_test', 'w')
        f.write('storage contents')
        f.close()
        self.assert_(self.storage.exists('storage_test'))

        f = self.storage.open('storage_test', 'r')
        self.assertEqual(f.read(), 'storage contents')
        f.close()

        self.storage.delete('storage_test')
        self.assertFalse(self.storage.exists('storage_test'))

    def test_file_accessed_time(self):
        """
        File storage returns a Datetime object for the last accessed time of
        a file.
        """
        self.assertFalse(self.storage.exists('test.file'))

        f = ContentFile('custom contents')
        f_name = self.storage.save('test.file', f)
        atime = self.storage.accessed_time(f_name)

        self.assertEqual(atime, datetime.fromtimestamp(
            os.path.getatime(self.storage.path(f_name))))
        self.assertTrue(datetime.now() - self.storage.accessed_time(f_name) < timedelta(seconds=2))
        self.storage.delete(f_name)

    def test_file_created_time(self):
        """
        File storage returns a Datetime object for the creation time of
        a file.
        """
        self.assertFalse(self.storage.exists('test.file'))

        f = ContentFile('custom contents')
        f_name = self.storage.save('test.file', f)
        ctime = self.storage.created_time(f_name)

        self.assertEqual(ctime, datetime.fromtimestamp(
            os.path.getctime(self.storage.path(f_name))))
        self.assertTrue(datetime.now() - self.storage.created_time(f_name) < timedelta(seconds=2))

        self.storage.delete(f_name)

    def test_file_modified_time(self):
        """
        File storage returns a Datetime object for the last modified time of
        a file.
        """
        self.assertFalse(self.storage.exists('test.file'))

        f = ContentFile('custom contents')
        f_name = self.storage.save('test.file', f)
        mtime = self.storage.modified_time(f_name)

        self.assertEqual(mtime, datetime.fromtimestamp(
            os.path.getmtime(self.storage.path(f_name))))
        self.assertTrue(datetime.now() - self.storage.modified_time(f_name) < timedelta(seconds=2))

        self.storage.delete(f_name)

    def test_file_save_without_name(self):
        """
        File storage extracts the filename from the content object if no
        name is given explicitly.
        """
        self.assertFalse(self.storage.exists('test.file'))

        f = ContentFile('custom contents')
        f.name = 'test.file'

        storage_f_name = self.storage.save(None, f)

        self.assertEqual(storage_f_name, f.name)

        self.assert_(os.path.exists(os.path.join(self.temp_dir, f.name)))

        self.storage.delete(storage_f_name)

    def test_file_path(self):
        """
        File storage returns the full path of a file
        """
        self.assertFalse(self.storage.exists('test.file'))

        f = ContentFile('custom contents')
        f_name = self.storage.save('test.file', f)

        self.assertEqual(self.storage.path(f_name),
            os.path.join(self.temp_dir, f_name))

        self.storage.delete(f_name)

    def test_file_url(self):
        """
        File storage returns a url to access a given file from the Web.
        """
        self.assertEqual(self.storage.url('test.file'),
            '%s%s' % (self.storage.base_url, 'test.file'))

        self.storage.base_url = None
        self.assertRaises(ValueError, self.storage.url, 'test.file')

    def test_file_with_mixin(self):
        """
        File storage can get a mixin to extend the functionality of the
        returned file.
        """
        self.assertFalse(self.storage.exists('test.file'))

        class TestFileMixin(object):
            mixed_in = True

        f = ContentFile('custom contents')
        f_name = self.storage.save('test.file', f)

        self.assert_(isinstance(
            self.storage.open('test.file', mixin=TestFileMixin),
            TestFileMixin
        ))

        self.storage.delete('test.file')

    def test_listdir(self):
        """
        File storage returns a tuple containing directories and files.
        """
        self.assertFalse(self.storage.exists('storage_test_1'))
        self.assertFalse(self.storage.exists('storage_test_2'))
        self.assertFalse(self.storage.exists('storage_dir_1'))

        f = self.storage.save('storage_test_1', ContentFile('custom content'))
        f = self.storage.save('storage_test_2', ContentFile('custom content'))
        os.mkdir(os.path.join(self.temp_dir, 'storage_dir_1'))

        dirs, files = self.storage.listdir('')
        self.assertEqual(set(dirs), set([u'storage_dir_1']))
        self.assertEqual(set(files),
                         set([u'storage_test_1', u'storage_test_2']))

        self.storage.delete('storage_test_1')
        self.storage.delete('storage_test_2')
        os.rmdir(os.path.join(self.temp_dir, 'storage_dir_1'))

    def test_file_storage_prevents_directory_traversal(self):
        """
        File storage prevents directory traversal (files can only be accessed if
        they're below the storage location).
        """
        self.assertRaises(SuspiciousOperation, self.storage.exists, '..')
        self.assertRaises(SuspiciousOperation, self.storage.exists, '/etc/passwd')

class CustomStorage(FileSystemStorage):
    def get_available_name(self, name):
        """
        Append numbers to duplicate files rather than underscores, like Trac.
        """
        parts = name.split('.')
        basename, ext = parts[0], parts[1:]
        number = 2
        while self.exists(name):
            name = '.'.join([basename, str(number)] + ext)
            number += 1

        return name

class CustomStorageTests(FileStorageTests):
    storage_class = CustomStorage

    def test_custom_get_available_name(self):
        first = self.storage.save('custom_storage', ContentFile('custom contents'))
        self.assertEqual(first, 'custom_storage')
        second = self.storage.save('custom_storage', ContentFile('more contents'))
        self.assertEqual(second, 'custom_storage.2')
        self.storage.delete(first)
        self.storage.delete(second)

class UnicodeFileNameTests(unittest.TestCase):
    def test_unicode_file_names(self):
        """
        Regression test for #8156: files with unicode names I can't quite figure
        out the encoding situation between doctest and this file, but the actual
        repr doesn't matter; it just shouldn't return a unicode object.
        """
        uf = UploadedFile(name=u'¿Cómo?',content_type='text')
        self.assertEqual(type(uf.__repr__()), str)

# Tests for a race condition on file saving (#4948).
# This is written in such a way that it'll always pass on platforms
# without threading.

class SlowFile(ContentFile):
    def chunks(self):
        time.sleep(1)
        return super(ContentFile, self).chunks()

class FileSaveRaceConditionTest(unittest.TestCase):
    def setUp(self):
        self.storage_dir = tempfile.mkdtemp()
        self.storage = FileSystemStorage(self.storage_dir)
        self.thread = threading.Thread(target=self.save_file, args=['conflict'])

    def tearDown(self):
        shutil.rmtree(self.storage_dir)

    def save_file(self, name):
        name = self.storage.save(name, SlowFile("Data"))

    def test_race_condition(self):
        self.thread.start()
        name = self.save_file('conflict')
        self.thread.join()
        self.assert_(self.storage.exists('conflict'))
        self.assert_(self.storage.exists('conflict_1'))
        self.storage.delete('conflict')
        self.storage.delete('conflict_1')

class FileStoragePermissions(unittest.TestCase):
    def setUp(self):
        self.old_perms = settings.FILE_UPLOAD_PERMISSIONS
        settings.FILE_UPLOAD_PERMISSIONS = 0666
        self.storage_dir = tempfile.mkdtemp()
        self.storage = FileSystemStorage(self.storage_dir)

    def tearDown(self):
        settings.FILE_UPLOAD_PERMISSIONS = self.old_perms
        shutil.rmtree(self.storage_dir)

    def test_file_upload_permissions(self):
        name = self.storage.save("the_file", ContentFile("data"))
        actual_mode = os.stat(self.storage.path(name))[0] & 0777
        self.assertEqual(actual_mode, 0666)


class FileStoragePathParsing(unittest.TestCase):
    def setUp(self):
        self.storage_dir = tempfile.mkdtemp()
        self.storage = FileSystemStorage(self.storage_dir)

    def tearDown(self):
        shutil.rmtree(self.storage_dir)

    def test_directory_with_dot(self):
        """Regression test for #9610.

        If the directory name contains a dot and the file name doesn't, make
        sure we still mangle the file name instead of the directory name.
        """

        self.storage.save('dotted.path/test', ContentFile("1"))
        self.storage.save('dotted.path/test', ContentFile("2"))

        self.assertFalse(os.path.exists(os.path.join(self.storage_dir, 'dotted_.path')))
        self.assert_(os.path.exists(os.path.join(self.storage_dir, 'dotted.path/test')))
        self.assert_(os.path.exists(os.path.join(self.storage_dir, 'dotted.path/test_1')))

    def test_first_character_dot(self):
        """
        File names with a dot as their first character don't have an extension,
        and the underscore should get added to the end.
        """
        self.storage.save('dotted.path/.test', ContentFile("1"))
        self.storage.save('dotted.path/.test', ContentFile("2"))

        self.assert_(os.path.exists(os.path.join(self.storage_dir, 'dotted.path/.test')))
        # Before 2.6, a leading dot was treated as an extension, and so
        # underscore gets added to beginning instead of end.
        if sys.version_info < (2, 6):
            self.assert_(os.path.exists(os.path.join(self.storage_dir, 'dotted.path/_1.test')))
        else:
            self.assert_(os.path.exists(os.path.join(self.storage_dir, 'dotted.path/.test_1')))

class DimensionClosingBug(unittest.TestCase):
    """
    Test that get_image_dimensions() properly closes files (#8817)
    """
    @unittest.skipUnless(Image, "PIL not installed")
    def test_not_closing_of_files(self):
        """
        Open files passed into get_image_dimensions() should stay opened.
        """
        empty_io = StringIO()
        try:
            get_image_dimensions(empty_io)
        finally:
            self.assert_(not empty_io.closed)

    @unittest.skipUnless(Image, "PIL not installed")
    def test_closing_of_filenames(self):
        """
        get_image_dimensions() called with a filename should closed the file.
        """
        # We need to inject a modified open() builtin into the images module
        # that checks if the file was closed properly if the function is
        # called with a filename instead of an file object.
        # get_image_dimensions will call our catching_open instead of the
        # regular builtin one.

        class FileWrapper(object):
            _closed = []
            def __init__(self, f):
                self.f = f
            def __getattr__(self, name):
                return getattr(self.f, name)
            def close(self):
                self._closed.append(True)
                self.f.close()

        def catching_open(*args):
            return FileWrapper(open(*args))

        from django.core.files import images
        images.open = catching_open
        try:
            get_image_dimensions(os.path.join(os.path.dirname(__file__), "test1.png"))
        finally:
            del images.open
        self.assert_(FileWrapper._closed)

class InconsistentGetImageDimensionsBug(unittest.TestCase):
    """
    Test that get_image_dimensions() works properly after various calls
    using a file handler (#11158)
    """
    @unittest.skipUnless(Image, "PIL not installed")
    def test_multiple_calls(self):
        """
        Multiple calls of get_image_dimensions() should return the same size.
        """
        from django.core.files.images import ImageFile

        img_path = os.path.join(os.path.dirname(__file__), "test.png")
        image = ImageFile(open(img_path, 'rb'))
        image_pil = Image.open(img_path)
        size_1, size_2 = get_image_dimensions(image), get_image_dimensions(image)
        self.assertEqual(image_pil.size, size_1)
        self.assertEqual(size_1, size_2)
