import shutil

from django.core.cache import cache

from django.core.files.base import ContentFile

from django.core.files.uploadedfile import SimpleUploadedFile

from django.test import TestCase

from models import Storage, temp_storage, temp_storage_location

class FileTests(TestCase):

    def tearDown(self):

        shutil.rmtree(temp_storage_location)

    def test_files(self):

        # Attempting to access a FileField from the class raises a descriptive

        # error

        self.assertRaises(AttributeError, lambda: Storage.normal)

        # An object without a file has limited functionality.

        obj1 = Storage()

        self.assertEqual(obj1.normal.name, "")

        self.assertRaises(ValueError, lambda: obj1.normal.size)

        # Saving a file enables full functionality.

        obj1.normal.save("django_test.txt", ContentFile("content"))

        self.assertEqual(obj1.normal.name, "tests/django_test.txt")

        self.assertEqual(obj1.normal.size, 7)

        self.assertEqual(obj1.normal.read(), "content")

        # File objects can be assigned to FileField attributes, but shouldn't

        # get committed until the model it's attached to is saved.

        obj1.normal = SimpleUploadedFile("assignment.txt", "content")

        dirs, files = temp_storage.listdir("tests")

        self.assertEqual(dirs, [])

        self.assertEqual(sorted(files), ["default.txt", "django_test.txt"])

        obj1.save()

        dirs, files = temp_storage.listdir("tests")

        self.assertEqual(

            sorted(files), ["assignment.txt", "default.txt", "django_test.txt"]

        )

        # Files can be read in a little at a time, if necessary.

        obj1.normal.open()

        self.assertEqual(obj1.normal.read(3), "con")

        self.assertEqual(obj1.normal.read(), "tent")

        self.assertEqual(list(obj1.normal.chunks(chunk_size=2)), ["co", "nt", "en", "t"])

        # Save another file with the same name.

        obj2 = Storage()

        obj2.normal.save("django_test.txt", ContentFile("more content"))

        self.assertEqual(obj2.normal.name, "tests/django_test_1.txt")

        self.assertEqual(obj2.normal.size, 12)

        # Push the objects into the cache to make sure they pickle properly

        cache.set("obj1", obj1)

        cache.set("obj2", obj2)

        self.assertEqual(cache.get("obj2").normal.name, "tests/django_test_1.txt")

        # Deleting an object deletes the file it uses, if there are no other

        # objects still using that file.

        obj2.delete()

        obj2.normal.save("django_test.txt", ContentFile("more content"))

        self.assertEqual(obj2.normal.name, "tests/django_test_1.txt")

        # Multiple files with the same name get _N appended to them.

        objs = [Storage() for i in range(3)]

        for o in objs:

            o.normal.save("multiple_files.txt", ContentFile("Same Content"))

        self.assertEqual(

            [o.normal.name for o in objs],

            ["tests/multiple_files.txt", "tests/multiple_files_1.txt", "tests/multiple_files_2.txt"]

        )

        for o in objs:

            o.delete()

        # Default values allow an object to access a single file.

        obj3 = Storage.objects.create()

        self.assertEqual(obj3.default.name, "tests/default.txt")

        self.assertEqual(obj3.default.read(), "default content")

        # But it shouldn't be deleted, even if there are no more objects using

        # it.

        obj3.delete()

        obj3 = Storage()

        self.assertEqual(obj3.default.read(), "default content")

        # Verify the fix for #5655, making sure the directory is only

        # determined once.

        obj4 = Storage()

        obj4.random.save("random_file", ContentFile("random content"))

        self.assertTrue(obj4.random.name.endswith("/random_file"))

        # Clean up the temporary files and dir.

        obj1.normal.delete()

        obj2.normal.delete()

        obj3.default.delete()

        obj4.random.delete()