import unittest
try:
    import google.cloud
except ImportError:
    raise unittest.SkipTest("google.cloud package not installed, skipping tests")

import mimetypes
from datetime import datetime, timedelta
from unittest import mock

from django.core.exceptions import ImproperlyConfigured
from django.core.files.base import ContentFile
from django.test import TestCase, override_settings
from django.utils import timezone
from google.cloud.exceptions import NotFound
from google.cloud.storage.blob import Blob

from storages.backends import gcloud


class GCloudTestCase(TestCase):
    def setUp(self):
        self.bucket_name = 'test_bucket'
        self.filename = 'test_file.txt'

        self.storage = gcloud.GoogleCloudStorage(bucket_name=self.bucket_name)

        self.client_patcher = mock.patch('storages.backends.gcloud.Client')
        self.client_patcher.start()

    def tearDown(self):
        self.client_patcher.stop()


class GCloudStorageTests(GCloudTestCase):

    def test_open_read(self):
        """
        Test opening a file and reading from it
        """
        data = b'This is some test read data.'

        f = self.storage.open(self.filename)
        self.storage._client.bucket.assert_called_with(self.bucket_name)
        self.storage._bucket.get_blob.assert_called_with(self.filename)

        f.blob.download_to_file = lambda tmpfile: tmpfile.write(data)
        self.assertEqual(f.read(), data)

    def test_open_read_num_bytes(self):
        data = b'This is some test read data.'
        num_bytes = 10

        f = self.storage.open(self.filename)
        self.storage._client.bucket.assert_called_with(self.bucket_name)
        self.storage._bucket.get_blob.assert_called_with(self.filename)

        f.blob.download_to_file = lambda tmpfile: tmpfile.write(data)
        self.assertEqual(f.read(num_bytes), data[0:num_bytes])

    def test_open_read_nonexistent(self):
        self.storage._bucket = mock.MagicMock()
        self.storage._bucket.get_blob.return_value = None

        self.assertRaises(FileNotFoundError, self.storage.open, self.filename)
        self.storage._bucket.get_blob.assert_called_with(self.filename)

    def test_open_read_nonexistent_unicode(self):
        filename = 'ủⓝï℅ⅆℇ.txt'

        self.storage._bucket = mock.MagicMock()
        self.storage._bucket.get_blob.return_value = None

        self.assertRaises(FileNotFoundError, self.storage.open, filename)

    @mock.patch('storages.backends.gcloud.Blob')
    def test_open_write(self, MockBlob):
        """
        Test opening a file and writing to it
        """
        data = 'This is some test write data.'

        # Simulate the file not existing before the write
        self.storage._bucket = mock.MagicMock()
        self.storage._bucket.get_blob.return_value = None
        self.storage.default_acl = 'projectPrivate'

        f = self.storage.open(self.filename, 'wb')
        MockBlob.assert_called_with(self.filename, self.storage._bucket, chunk_size=None)

        f.write(data)
        tmpfile = f._file
        # File data is not actually written until close(), so do that.
        f.close()

        MockBlob().upload_from_file.assert_called_with(
            tmpfile, rewind=True,
            content_type=mimetypes.guess_type(self.filename)[0],
            predefined_acl='projectPrivate')

    def test_save(self):
        data = 'This is some test content.'
        content = ContentFile(data)

        self.storage.save(self.filename, content)

        self.storage._client.bucket.assert_called_with(self.bucket_name)
        self.storage._bucket.get_blob().upload_from_file.assert_called_with(
            content, rewind=True, size=len(data), content_type=mimetypes.guess_type(self.filename)[0],
            predefined_acl=None)

    def test_save2(self):
        data = 'This is some test ủⓝï℅ⅆℇ content.'
        filename = 'ủⓝï℅ⅆℇ.txt'
        content = ContentFile(data)

        self.storage.save(filename, content)

        self.storage._client.bucket.assert_called_with(self.bucket_name)
        self.storage._bucket.get_blob().upload_from_file.assert_called_with(
            content, rewind=True, size=len(data), content_type=mimetypes.guess_type(filename)[0],
            predefined_acl=None)

    def test_save_with_default_acl(self):
        data = 'This is some test ủⓝï℅ⅆℇ content.'
        filename = 'ủⓝï℅ⅆℇ.txt'
        content = ContentFile(data)

        # ACL Options
        # 'projectPrivate', 'bucketOwnerRead', 'bucketOwnerFullControl',
        # 'private', 'authenticatedRead', 'publicRead', 'publicReadWrite'
        self.storage.default_acl = 'publicRead'

        self.storage.save(filename, content)

        self.storage._client.bucket.assert_called_with(self.bucket_name)
        self.storage._bucket.get_blob().upload_from_file.assert_called_with(
            content, rewind=True, size=len(data), content_type=mimetypes.guess_type(filename)[0],
            predefined_acl='publicRead')

    def test_delete(self):
        self.storage.delete(self.filename)

        self.storage._client.bucket.assert_called_with(self.bucket_name)
        self.storage._bucket.delete_blob.assert_called_with(self.filename)

    def test_exists(self):
        self.storage._bucket = mock.MagicMock()
        self.assertTrue(self.storage.exists(self.filename))
        self.storage._bucket.get_blob.assert_called_with(self.filename)

        self.storage._bucket.reset_mock()
        self.storage._bucket.get_blob.return_value = None
        self.assertFalse(self.storage.exists(self.filename))
        self.storage._bucket.get_blob.assert_called_with(self.filename)

    def test_exists_no_bucket(self):
        # exists('') should return False if the bucket doesn't exist
        self.storage._client = mock.MagicMock()
        self.storage._client.get_bucket.side_effect = NotFound('dang')
        self.assertFalse(self.storage.exists(''))

    def test_exists_bucket(self):
        # exists('') should return True if the bucket exists
        self.assertTrue(self.storage.exists(''))

    def test_listdir(self):
        file_names = ["some/path/1.txt", "2.txt", "other/path/3.txt", "4.txt"]
        subdir = ""

        self.storage._bucket = mock.MagicMock()
        blobs, prefixes = [], []
        for name in file_names:
            directory = name.rsplit("/", 1)[0]+"/" if "/" in name else ""
            if directory == subdir:
                blob = mock.MagicMock(spec=Blob)
                blob.name = name.split("/")[-1]
                blobs.append(blob)
            else:
                prefixes.append(directory.split("/")[0]+"/")

        return_value = mock.MagicMock()
        return_value.__iter__ = mock.MagicMock(return_value=iter(blobs))
        return_value.prefixes = prefixes
        self.storage._bucket.list_blobs.return_value = return_value

        dirs, files = self.storage.listdir('')

        self.assertEqual(len(dirs), 2)
        for directory in ["some", "other"]:
            self.assertTrue(directory in dirs,
                            """ "{}" not in directory list "{}".""".format(
                                directory, dirs))

        self.assertEqual(len(files), 2)
        for filename in ["2.txt", "4.txt"]:
            self.assertTrue(filename in files,
                            """ "{}" not in file list "{}".""".format(
                                filename, files))

    def test_listdir_subdir(self):
        file_names = ["some/path/1.txt", "some/2.txt"]
        subdir = "some/"

        self.storage._bucket = mock.MagicMock()
        blobs, prefixes = [], []
        for name in file_names:
            directory = name.rsplit("/", 1)[0] + "/"
            if directory == subdir:
                blob = mock.MagicMock(spec=Blob)
                blob.name = name.split("/")[-1]
                blobs.append(blob)
            else:
                prefixes.append(directory.split(subdir)[1])

        return_value = mock.MagicMock()
        return_value.__iter__ = mock.MagicMock(return_value=iter(blobs))
        return_value.prefixes = prefixes
        self.storage._bucket.list_blobs.return_value = return_value

        dirs, files = self.storage.listdir(subdir)

        self.assertEqual(len(dirs), 1)
        self.assertTrue('path' in dirs,
                        """ "path" not in directory list "{}".""".format(dirs))

        self.assertEqual(len(files), 1)
        self.assertTrue('2.txt' in files,
                        """ "2.txt" not in files list "{}".""".format(files))

    def test_size(self):
        size = 1234

        self.storage._bucket = mock.MagicMock()
        blob = mock.MagicMock()
        blob.size = size
        self.storage._bucket.get_blob.return_value = blob

        self.assertEqual(self.storage.size(self.filename), size)
        self.storage._bucket.get_blob.assert_called_with(self.filename)

    def test_size_no_file(self):
        self.storage._bucket = mock.MagicMock()
        self.storage._bucket.get_blob.return_value = None

        self.assertRaises(NotFound, self.storage.size, self.filename)

    def test_modified_time(self):
        naive_date = datetime(2017, 1, 2, 3, 4, 5, 678)
        aware_date = timezone.make_aware(naive_date, timezone.utc)

        self.storage._bucket = mock.MagicMock()
        blob = mock.MagicMock()
        blob.updated = aware_date
        self.storage._bucket.get_blob.return_value = blob

        with self.settings(TIME_ZONE='UTC'):
            mt = self.storage.modified_time(self.filename)
            self.assertTrue(timezone.is_naive(mt))
            self.assertEqual(mt, naive_date)
            self.storage._bucket.get_blob.assert_called_with(self.filename)

    def test_get_modified_time(self):
        naive_date = datetime(2017, 1, 2, 3, 4, 5, 678)
        aware_date = timezone.make_aware(naive_date, timezone.utc)

        self.storage._bucket = mock.MagicMock()
        blob = mock.MagicMock()
        blob.updated = aware_date
        self.storage._bucket.get_blob.return_value = blob

        with self.settings(TIME_ZONE='America/Montreal', USE_TZ=False):
            mt = self.storage.get_modified_time(self.filename)
            self.assertTrue(timezone.is_naive(mt))
            naive_date_montreal = timezone.make_naive(aware_date)
            self.assertEqual(mt, naive_date_montreal)
            self.storage._bucket.get_blob.assert_called_with(self.filename)

        with self.settings(TIME_ZONE='America/Montreal', USE_TZ=True):
            mt = self.storage.get_modified_time(self.filename)
            self.assertTrue(timezone.is_aware(mt))
            self.assertEqual(mt, aware_date)
            self.storage._bucket.get_blob.assert_called_with(self.filename)

    def test_get_created_time(self):
        naive_date = datetime(2017, 1, 2, 3, 4, 5, 678)
        aware_date = timezone.make_aware(naive_date, timezone.utc)

        self.storage._bucket = mock.MagicMock()
        blob = mock.MagicMock()
        blob.time_created = aware_date
        self.storage._bucket.get_blob.return_value = blob

        with self.settings(TIME_ZONE='America/Montreal', USE_TZ=False):
            mt = self.storage.get_created_time(self.filename)
            self.assertTrue(timezone.is_naive(mt))
            naive_date_montreal = timezone.make_naive(aware_date)
            self.assertEqual(mt, naive_date_montreal)
            self.storage._bucket.get_blob.assert_called_with(self.filename)

        with self.settings(TIME_ZONE='America/Montreal', USE_TZ=True):
            mt = self.storage.get_created_time(self.filename)
            self.assertTrue(timezone.is_aware(mt))
            self.assertEqual(mt, aware_date)
            self.storage._bucket.get_blob.assert_called_with(self.filename)

    def test_modified_time_no_file(self):
        self.storage._bucket = mock.MagicMock()
        self.storage._bucket.get_blob.return_value = None

        self.assertRaises(NotFound, self.storage.modified_time, self.filename)

    def test_url_public_object(self):
        url = 'https://example.com/mah-bukkit/{}'.format(self.filename)
        self.storage.default_acl = 'publicRead'

        self.storage._bucket = mock.MagicMock()
        blob = mock.MagicMock()
        blob.public_url = url
        blob.generate_signed_url = 'not called'
        self.storage._bucket.blob.return_value = blob

        self.assertEqual(self.storage.url(self.filename), url)
        self.storage._bucket.blob.assert_called_with(self.filename)

    def test_url_not_public_file(self):
        secret_filename = 'secret_file.txt'
        self.storage._bucket = mock.MagicMock()
        blob = mock.MagicMock()
        generate_signed_url = mock.MagicMock(return_value='http://signed_url')
        blob.public_url = 'http://this_is_public_url'
        blob.generate_signed_url = generate_signed_url
        self.storage._bucket.blob.return_value = blob

        url = self.storage.url(secret_filename)
        self.storage._bucket.blob.assert_called_with(secret_filename)
        self.assertEqual(url, 'http://signed_url')
        blob.generate_signed_url.assert_called_with(timedelta(seconds=86400))

    def test_url_not_public_file_with_custom_expires(self):
        secret_filename = 'secret_file.txt'
        self.storage._bucket = mock.MagicMock()
        blob = mock.MagicMock()
        generate_signed_url = mock.MagicMock(return_value='http://signed_url')
        blob.generate_signed_url = generate_signed_url
        self.storage._bucket.blob.return_value = blob

        self.storage.expiration = timedelta(seconds=3600)

        url = self.storage.url(secret_filename)
        self.storage._bucket.blob.assert_called_with(secret_filename)
        self.assertEqual(url, 'http://signed_url')
        blob.generate_signed_url.assert_called_with(timedelta(seconds=3600))

    def test_custom_endpoint(self):
        self.storage.custom_endpoint = "https://example.com"

        self.storage.default_acl = 'publicRead'
        url = "{}/{}".format(self.storage.custom_endpoint, self.filename)
        self.assertEqual(self.storage.url(self.filename), url)

        signed_url = 'https://signed_url'
        self.storage.default_acl = 'projectPrivate'
        self.storage._bucket = mock.MagicMock()
        blob = mock.MagicMock()
        generate_signed_url = mock.MagicMock(return_value=signed_url)
        blob.generate_signed_url = generate_signed_url
        self.storage._bucket.blob.return_value = blob
        self.assertEqual(self.storage.url(self.filename), signed_url)

    def test_get_available_name(self):
        self.storage.file_overwrite = True
        self.assertEqual(self.storage.get_available_name(
            self.filename), self.filename)

        self.storage._bucket = mock.MagicMock()
        self.storage._bucket.get_blob.return_value = None
        self.storage.file_overwrite = False
        self.assertEqual(self.storage.get_available_name(
            self.filename), self.filename)
        self.storage._bucket.get_blob.assert_called_with(self.filename)

    def test_get_available_name_unicode(self):
        filename = 'ủⓝï℅ⅆℇ.txt'
        self.assertEqual(self.storage.get_available_name(filename), filename)

    def test_cache_control(self):
        data = 'This is some test content.'
        filename = 'cache_control_file.txt'
        content = ContentFile(data)
        cache_control = 'public, max-age=604800'

        self.storage.cache_control = cache_control
        self.storage.save(filename, content)

        bucket = self.storage.client.bucket(self.bucket_name)
        blob = bucket.get_blob(filename)
        self.assertEqual(blob.cache_control, cache_control)

    def test_location_leading_slash(self):
        msg = (
            "GoogleCloudStorage.location cannot begin with a leading slash. "
            "Found '/'. Use '' instead."
        )
        with self.assertRaises(ImproperlyConfigured, msg=msg):
            gcloud.GoogleCloudStorage(location='/')

    def test_override_settings(self):
        with override_settings(GS_LOCATION='foo1'):
            storage = gcloud.GoogleCloudStorage()
            self.assertEqual(storage.location, 'foo1')
        with override_settings(GS_LOCATION='foo2'):
            storage = gcloud.GoogleCloudStorage()
            self.assertEqual(storage.location, 'foo2')

    def test_override_class_variable(self):
        class MyStorage1(gcloud.GoogleCloudStorage):
            location = 'foo1'

        storage = MyStorage1()
        self.assertEqual(storage.location, 'foo1')

        class MyStorage2(gcloud.GoogleCloudStorage):
            location = 'foo2'

        storage = MyStorage2()
        self.assertEqual(storage.location, 'foo2')

    def test_override_init_argument(self):
        storage = gcloud.GoogleCloudStorage(location='foo1')
        self.assertEqual(storage.location, 'foo1')
        storage = gcloud.GoogleCloudStorage(location='foo2')
        self.assertEqual(storage.location, 'foo2')