#!/usr/bin/env python3
from __future__ import absolute_import, division, unicode_literals

import contextlib
import socket
import sys
import os
import time

from future import utils
from future.backports.test import support

import future.moves.urllib.request as urllib_request
# import future.backports.email.message as email_message
# from future.backports.email.message import Message
import email.message as email_message
from email.message import Message

from future.tests.base import unittest, skip26
from future.builtins import int, open


class URLTimeoutTest(unittest.TestCase):
    # XXX this test doesn't seem to test anything useful.

    TIMEOUT = 30.0

    def setUp(self):
        socket.setdefaulttimeout(self.TIMEOUT)

    def tearDown(self):
        socket.setdefaulttimeout(None)

    def testURLread(self):
        with support.transient_internet("www.python.org"):
            f = urllib_request.urlopen("http://www.python.org/")
            x = f.read()


class urlopenNetworkTests(unittest.TestCase):
    """Tests urllib.request.urlopen using the network.

    These tests are not exhaustive.  Assuming that testing using files does a
    good job overall of some of the basic interface features.  There are no
    tests exercising the optional 'data' and 'proxies' arguments.  No tests
    for transparent redirection have been written.

    setUp is not used for always constructing a connection to
    http://www.python.org/ since there a few tests that don't use that address
    and making a connection is expensive enough to warrant minimizing unneeded
    connections.

    """

    @contextlib.contextmanager
    def urlopen(self, *args, **kwargs):
        resource = args[0]
        with support.transient_internet(resource):
            r = urllib_request.urlopen(*args, **kwargs)
            try:
                yield r
            finally:
                r.close()

    def test_basic(self):
        # Simple test expected to pass.
        with self.urlopen("http://www.python.org/") as open_url:
            for attr in ("read", "readline", "readlines", "fileno", "close",
                         "info", "geturl"):
                self.assertTrue(hasattr(open_url, attr), "object returned from "
                                "urlopen lacks the %s attribute" % attr)
            self.assertTrue(open_url.read(), "calling 'read' failed")

    def test_readlines(self):
        # Test both readline and readlines.
        with self.urlopen("http://www.python.org/") as open_url:
            self.assertIsInstance(open_url.readline(), bytes,
                                  "readline did not return a string")
            self.assertIsInstance(open_url.readlines(), list,
                                  "readlines did not return a list")

    @unittest.skipIf(utils.PY2, 'test not applicable on Py2')
    def test_info(self):
        # Test 'info'.
        with self.urlopen("http://www.python.org/") as open_url:
            info_obj = open_url.info()
            self.assertIsInstance(info_obj, email_message.Message,
                                  "object returned by 'info' is not an "
                                  "instance of email_message.Message")
            self.assertEqual(info_obj.get_content_subtype(), "html")

    def test_geturl(self):
        # Make sure same URL as opened is returned by geturl.
        URL = "https://www.python.org/"    # EJS: changed recently from http:// ?!
        with self.urlopen(URL) as open_url:
            gotten_url = open_url.geturl()
            self.assertEqual(gotten_url, URL)

    def test_getcode(self):
        # test getcode() with the fancy opener to get 404 error codes
        URL = "http://www.python.org/XXXinvalidXXX"
        with support.transient_internet(URL):
            open_url = urllib_request.FancyURLopener().open(URL)
            try:
                code = open_url.getcode()
            finally:
                open_url.close()
            self.assertEqual(code, 404)

    # On Windows, socket handles are not file descriptors; this
    # test can't pass on Windows.
    @unittest.skipIf(sys.platform in ('darwin', 'win32',), 'not appropriate for Windows')
    @unittest.skipIf(utils.PY36_PLUS, 'test not applicable on Python 3.5 and higher')
    @skip26
    def test_fileno(self):
        # Make sure fd returned by fileno is valid.
        with self.urlopen("http://www.python.org/", timeout=None) as open_url:
            fd = open_url.fileno()
            with os.fdopen(fd, 'rb') as f:
                self.assertTrue(f.read(), "reading from file created using fd "
                                          "returned by fileno failed")

    def test_bad_address(self):
        # Make sure proper exception is raised when connecting to a bogus
        # address.
        bogus_domain = "sadflkjsasf.i.nvali.d"
        try:
            socket.gethostbyname(bogus_domain)
        except (OSError, socket.error):     # for Py3 and Py2 respectively
            # socket.gaierror is too narrow, since getaddrinfo() may also
            # fail with EAI_SYSTEM and ETIMEDOUT (seen on Ubuntu 13.04),
            # i.e. Python's TimeoutError.
            pass
        else:
            # This happens with some overzealous DNS providers such as OpenDNS
            self.skipTest("%r should not resolve for test to work" % bogus_domain)
        self.assertRaises(IOError,
                          # SF patch 809915:  In Sep 2003, VeriSign started
                          # highjacking invalid .com and .net addresses to
                          # boost traffic to their own site.  This test
                          # started failing then.  One hopes the .invalid
                          # domain will be spared to serve its defined
                          # purpose.
                          # urllib.urlopen, "http://www.sadflkjsasadf.com/")
                          urllib_request.urlopen,
                          "http://sadflkjsasf.i.nvali.d/")


class urlretrieveNetworkTests(unittest.TestCase):
    """Tests urllib_request.urlretrieve using the network."""

    @contextlib.contextmanager
    def urlretrieve(self, *args, **kwargs):
        resource = args[0]
        with support.transient_internet(resource):
            file_location, info = urllib_request.urlretrieve(*args, **kwargs)
            try:
                yield file_location, info
            finally:
                support.unlink(file_location)

    def test_basic(self):
        # Test basic functionality.
        with self.urlretrieve("http://www.python.org/") as (file_location, info):
            self.assertTrue(os.path.exists(file_location), "file location returned by"
                            " urlretrieve is not a valid path")
            with open(file_location, 'rb') as f:
                self.assertTrue(f.read(), "reading from the file location returned"
                                " by urlretrieve failed")

    def test_specified_path(self):
        # Make sure that specifying the location of the file to write to works.
        with self.urlretrieve("http://www.python.org/",
                              support.TESTFN) as (file_location, info):
            self.assertEqual(file_location, support.TESTFN)
            self.assertTrue(os.path.exists(file_location))
            with open(file_location, 'rb') as f:
                self.assertTrue(f.read(), "reading from temporary file failed")

    @unittest.skipIf(utils.PY2, 'test not applicable on Py2')
    def test_header(self):
        # Make sure header returned as 2nd value from urlretrieve is good.
        with self.urlretrieve("http://www.python.org/") as (file_location, info):
            self.assertIsInstance(info, email_message.Message,
                                  "info is not an instance of email_message.Message")

    logo = "http://www.python.org/static/community_logos/python-logo-master-v3-TM.png"

    def test_data_header(self):
        with self.urlretrieve(self.logo) as (file_location, fileheaders):
            datevalue = fileheaders.get('Date')
            dateformat = '%a, %d %b %Y %H:%M:%S GMT'
            try:
                time.strptime(datevalue, dateformat)
            except ValueError:
                self.fail('Date value not in %r format', dateformat)

    def test_reporthook(self):
        records = []
        def recording_reporthook(blocks, block_size, total_size):
            records.append((blocks, block_size, total_size))

        with self.urlretrieve(self.logo, reporthook=recording_reporthook) as (
                file_location, fileheaders):
            expected_size = int(fileheaders['Content-Length'])

        records_repr = repr(records)  # For use in error messages.
        self.assertGreater(len(records), 1, msg="There should always be two "
                           "calls; the first one before the transfer starts.")
        self.assertEqual(records[0][0], 0)
        self.assertGreater(records[0][1], 0,
                           msg="block size can't be 0 in %s" % records_repr)
        self.assertEqual(records[0][2], expected_size)
        self.assertEqual(records[-1][2], expected_size)

        block_sizes = set(block_size for _, block_size, _ in records)
        self.assertEqual(set([records[0][1]]), block_sizes,
                         msg="block sizes in %s must be equal" % records_repr)
        self.assertGreaterEqual(records[-1][0]*records[0][1], expected_size,
                                msg="number of blocks * block size must be"
                                " >= total size in %s" % records_repr)


def test_main():
    # support.requires('network')
    support.run_unittest(URLTimeoutTest,
                         urlopenNetworkTests,
                         urlretrieveNetworkTests)

if __name__ == "__main__":
    test_main()
