import io
from unittest.mock import patch

from django.core.exceptions import ImproperlyConfigured
from django.core.files.base import File
from django.test import TestCase

from storages.backends import ftp

USER = "foo"
PASSWORD = "b@r"
HOST = "localhost"
PORT = 2121
URL = "ftp://{user}:{passwd}@{host}:{port}/".format(
    user=USER, passwd=PASSWORD, host=HOST, port=PORT
)

LIST_FIXTURE = """drwxr-xr-x   2 ftp      nogroup      4096 Jul 27 09:46 dir
-rw-r--r--   1 ftp      nogroup      1024 Jul 27 09:45 fi
-rw-r--r--   1 ftp      nogroup      2048 Jul 27 09:50 fi2"""


def list_retrlines(cmd, func):
    for line in LIST_FIXTURE.splitlines():
        func(line)


class FTPTest(TestCase):
    def setUp(self):
        self.storage = ftp.FTPStorage(location=URL)

    def test_init_no_location(self):
        with self.assertRaises(ImproperlyConfigured):
            ftp.FTPStorage()

    @patch("storages.backends.ftp.setting", return_value=URL)
    def test_init_location_from_setting(self, mock_setting):
        storage = ftp.FTPStorage()
        self.assertTrue(mock_setting.called)
        self.assertEqual(storage.location, URL)

    def test_decode_location(self):
        config = self.storage._decode_location(URL)
        wanted_config = {
            "passwd": "b@r",
            "host": "localhost",
            "user": "foo",
            "active": False,
            "path": "/",
            "port": 2121,
        }
        self.assertEqual(config, wanted_config)
        # Test active FTP
        config = self.storage._decode_location("a" + URL)
        wanted_config = {
            "passwd": "b@r",
            "host": "localhost",
            "user": "foo",
            "active": True,
            "path": "/",
            "port": 2121,
        }
        self.assertEqual(config, wanted_config)

    def test_decode_location_error(self):
        with self.assertRaises(ImproperlyConfigured):
            self.storage._decode_location("foo")
        with self.assertRaises(ImproperlyConfigured):
            self.storage._decode_location("http://foo.pt")
        # TODO: Cannot not provide a port
        # with self.assertRaises(ImproperlyConfigured):
        #     self.storage._decode_location('ftp://')

    @patch("ftplib.FTP")
    def test_start_connection(self, mock_ftp):
        self.storage._start_connection()
        self.assertIsNotNone(self.storage._connection)
        # Start active
        storage = ftp.FTPStorage(location="a" + URL)
        storage._start_connection()

    @patch("ftplib.FTP", **{"return_value.pwd.side_effect": IOError()})
    def test_start_connection_timeout(self, mock_ftp):
        self.storage._start_connection()
        self.assertIsNotNone(self.storage._connection)

    @patch("ftplib.FTP", **{"return_value.connect.side_effect": IOError()})
    def test_start_connection_error(self, mock_ftp):
        with self.assertRaises(ftp.FTPStorageException):
            self.storage._start_connection()

    @patch("ftplib.FTP", **{"return_value.quit.return_value": None})
    def test_disconnect(self, mock_ftp_quit):
        self.storage._start_connection()
        self.storage.disconnect()
        self.assertIsNone(self.storage._connection)

    @patch("ftplib.FTP", **{"return_value.pwd.return_value": "foo"})
    def test_mkremdirs(self, mock_ftp):
        self.storage._start_connection()
        self.storage._mkremdirs("foo/bar")

    @patch("ftplib.FTP", **{"return_value.pwd.return_value": "foo"})
    def test_mkremdirs_n_subdirectories(self, mock_ftp):
        self.storage._start_connection()
        self.storage._mkremdirs("foo/bar/null")

    @patch(
        "ftplib.FTP",
        **{
            "return_value.pwd.return_value": "foo",
            "return_value.storbinary.return_value": None,
        },
    )
    def test_put_file(self, mock_ftp):
        self.storage._start_connection()
        self.storage._put_file("foo", File(io.BytesIO(b"foo"), "foo"))

    @patch(
        "ftplib.FTP",
        **{
            "return_value.pwd.return_value": "foo",
            "return_value.storbinary.side_effect": IOError(),
        },
    )
    def test_put_file_error(self, mock_ftp):
        self.storage._start_connection()
        with self.assertRaises(ftp.FTPStorageException):
            self.storage._put_file("foo", File(io.BytesIO(b"foo"), "foo"))

    def test_open(self):
        remote_file = self.storage._open("foo")
        self.assertIsInstance(remote_file, ftp.FTPStorageFile)

    @patch("ftplib.FTP", **{"return_value.pwd.return_value": "foo"})
    def test_read(self, mock_ftp):
        self.storage._start_connection()
        self.storage._read("foo")

    @patch("ftplib.FTP", **{"return_value.pwd.side_effect": IOError()})
    def test_read2(self, mock_ftp):
        self.storage._start_connection()
        with self.assertRaises(ftp.FTPStorageException):
            self.storage._read("foo")

    @patch(
        "ftplib.FTP",
        **{
            "return_value.pwd.return_value": "foo",
            "return_value.storbinary.return_value": None,
        },
    )
    def test_save(self, mock_ftp):
        self.storage._save("foo", File(io.BytesIO(b"foo"), "foo"))

    @patch("ftplib.FTP", **{"return_value.retrlines": list_retrlines})
    def test_listdir(self, mock_retrlines):
        dirs, files = self.storage.listdir("/")
        self.assertEqual(len(dirs), 1)
        self.assertEqual(dirs, ["dir"])
        self.assertEqual(len(files), 2)
        self.assertEqual(sorted(files), sorted(["fi", "fi2"]))

    @patch("ftplib.FTP", **{"return_value.retrlines.side_effect": IOError()})
    def test_listdir_error(self, mock_ftp):
        with self.assertRaises(ftp.FTPStorageException):
            self.storage.listdir("/")

    @patch("ftplib.FTP", **{"return_value.nlst.return_value": ["foo", "foo2"]})
    def test_exists(self, mock_ftp):
        self.assertTrue(self.storage.exists("foo"))
        self.assertFalse(self.storage.exists("bar"))

    @patch("ftplib.FTP", **{"return_value.nlst.side_effect": IOError()})
    def test_exists_error(self, mock_ftp):
        with self.assertRaises(ftp.FTPStorageException):
            self.storage.exists("foo")

    @patch(
        "ftplib.FTP",
        **{
            "return_value.delete.return_value": None,
            "return_value.nlst.return_value": ["foo", "foo2"],
        },
    )
    def test_delete(self, mock_ftp):
        self.storage.delete("foo")
        self.assertTrue(mock_ftp.return_value.delete.called)

    @patch("ftplib.FTP", **{"return_value.retrlines": list_retrlines})
    def test_size(self, mock_ftp):
        self.assertEqual(1024, self.storage.size("fi"))
        self.assertEqual(2048, self.storage.size("fi2"))
        self.assertEqual(0, self.storage.size("bar"))

    @patch("ftplib.FTP", **{"return_value.retrlines.side_effect": IOError()})
    def test_size_error(self, mock_ftp):
        self.assertEqual(0, self.storage.size("foo"))

    def test_url(self):
        with self.assertRaises(ValueError):
            self.storage._base_url = None
            self.storage.url("foo")
        self.storage = ftp.FTPStorage(location=URL, base_url="http://foo.bar/")
        self.assertEqual("http://foo.bar/foo", self.storage.url("foo"))


class FTPStorageFileTest(TestCase):
    def setUp(self):
        self.storage = ftp.FTPStorage(location=URL)

    @patch("ftplib.FTP", **{"return_value.retrlines": list_retrlines})
    def test_size(self, mock_ftp):
        file_ = ftp.FTPStorageFile("fi", self.storage, "wb")
        self.assertEqual(file_.size, 1024)

    @patch("ftplib.FTP", **{"return_value.pwd.return_value": "foo"})
    @patch("storages.backends.ftp.FTPStorage._read", return_value=io.BytesIO(b"foo"))
    def test_readlines(self, mock_ftp, mock_storage):
        file_ = ftp.FTPStorageFile("fi", self.storage, "wb")
        self.assertEqual([b"foo"], file_.readlines())

    @patch("ftplib.FTP", **{"return_value.pwd.return_value": "foo"})
    @patch("storages.backends.ftp.FTPStorage._read", return_value=io.BytesIO(b"foo"))
    def test_read(self, mock_ftp, mock_storage):
        file_ = ftp.FTPStorageFile("fi", self.storage, "wb")
        self.assertEqual(b"foo", file_.read())

    def test_write(self):
        file_ = ftp.FTPStorageFile("fi", self.storage, "wb")
        file_.write(b"foo")
        file_.seek(0)
        self.assertEqual(file_.file.read(), b"foo")

    @patch("ftplib.FTP", **{"return_value.pwd.return_value": "foo"})
    @patch("storages.backends.ftp.FTPStorage._read", return_value=io.BytesIO(b"foo"))
    def test_close(self, mock_ftp, mock_storage):
        file_ = ftp.FTPStorageFile("fi", self.storage, "wb")
        file_.is_dirty = True
        file_.read()
        file_.close()
