import pytest

from urllib3._collections import HTTPHeaderDict
from urllib3._collections import RecentlyUsedContainer as Container
from urllib3.exceptions import InvalidHeader
import six

xrange = six.moves.xrange


class TestLRUContainer(object):
    def test_maxsize(self):
        d = Container(5)

        for i in xrange(5):
            d[i] = str(i)

        assert len(d) == 5

        for i in xrange(5):
            assert d[i] == str(i)

        d[i + 1] = str(i + 1)

        assert len(d) == 5
        assert 0 not in d
        assert (i + 1) in d

    def test_expire(self):
        d = Container(5)

        for i in xrange(5):
            d[i] = str(i)

        for i in xrange(5):
            d.get(0)

        # Add one more entry
        d[5] = "5"

        # Check state
        assert list(d.keys()) == [2, 3, 4, 0, 5]

    def test_same_key(self):
        d = Container(5)

        for i in xrange(10):
            d["foo"] = i

        assert list(d.keys()) == ["foo"]
        assert len(d) == 1

    def test_access_ordering(self):
        d = Container(5)

        for i in xrange(10):
            d[i] = True

        # Keys should be ordered by access time
        assert list(d.keys()) == [5, 6, 7, 8, 9]

        new_order = [7, 8, 6, 9, 5]
        for k in new_order:
            d[k]

        assert list(d.keys()) == new_order

    def test_delete(self):
        d = Container(5)

        for i in xrange(5):
            d[i] = True

        del d[0]
        assert 0 not in d

        d.pop(1)
        assert 1 not in d

        d.pop(1, None)

    def test_get(self):
        d = Container(5)

        for i in xrange(5):
            d[i] = True

        r = d.get(4)
        assert r is True

        r = d.get(5)
        assert r is None

        r = d.get(5, 42)
        assert r == 42

        with pytest.raises(KeyError):
            d[5]

    def test_disposal(self):
        evicted_items = []

        def dispose_func(arg):
            # Save the evicted datum for inspection
            evicted_items.append(arg)

        d = Container(5, dispose_func=dispose_func)
        for i in xrange(5):
            d[i] = i
        assert list(d.keys()) == list(xrange(5))
        assert evicted_items == []  # Nothing disposed

        d[5] = 5
        assert list(d.keys()) == list(xrange(1, 6))
        assert evicted_items == [0]

        del d[1]
        assert evicted_items == [0, 1]

        d.clear()
        assert evicted_items == [0, 1, 2, 3, 4, 5]

    def test_iter(self):
        d = Container()

        with pytest.raises(NotImplementedError):
            d.__iter__()


class NonMappingHeaderContainer(object):
    def __init__(self, **kwargs):
        self._data = {}
        self._data.update(kwargs)

    def keys(self):
        return self._data.keys()

    def __getitem__(self, key):
        return self._data[key]


@pytest.fixture()
def d():
    header_dict = HTTPHeaderDict(Cookie="foo")
    header_dict.add("cookie", "bar")
    return header_dict


class TestHTTPHeaderDict(object):
    def test_create_from_kwargs(self):
        h = HTTPHeaderDict(ab=1, cd=2, ef=3, gh=4)
        assert len(h) == 4
        assert "ab" in h

    def test_create_from_dict(self):
        h = HTTPHeaderDict(dict(ab=1, cd=2, ef=3, gh=4))
        assert len(h) == 4
        assert "ab" in h

    def test_create_from_iterator(self):
        teststr = "urllib3ontherocks"
        h = HTTPHeaderDict((c, c * 5) for c in teststr)
        assert len(h) == len(set(teststr))

    def test_create_from_list(self):
        headers = [
            ("ab", "A"),
            ("cd", "B"),
            ("cookie", "C"),
            ("cookie", "D"),
            ("cookie", "E"),
        ]
        h = HTTPHeaderDict(headers)
        assert len(h) == 3
        assert "ab" in h
        clist = h.getlist("cookie")
        assert len(clist) == 3
        assert clist[0] == "C"
        assert clist[-1] == "E"

    def test_create_from_headerdict(self):
        headers = [
            ("ab", "A"),
            ("cd", "B"),
            ("cookie", "C"),
            ("cookie", "D"),
            ("cookie", "E"),
        ]
        org = HTTPHeaderDict(headers)
        h = HTTPHeaderDict(org)
        assert len(h) == 3
        assert "ab" in h
        clist = h.getlist("cookie")
        assert len(clist) == 3
        assert clist[0] == "C"
        assert clist[-1] == "E"
        assert h is not org
        assert h == org

    def test_setitem(self, d):
        d["Cookie"] = "foo"
        assert d["cookie"] == "foo"
        d["cookie"] = "with, comma"
        assert d.getlist("cookie") == ["with, comma"]

    def test_update(self, d):
        d.update(dict(Cookie="foo"))
        assert d["cookie"] == "foo"
        d.update(dict(cookie="with, comma"))
        assert d.getlist("cookie") == ["with, comma"]

    def test_delitem(self, d):
        del d["cookie"]
        assert "cookie" not in d
        assert "COOKIE" not in d

    def test_add_well_known_multiheader(self, d):
        d.add("COOKIE", "asdf")
        assert d.getlist("cookie") == ["foo", "bar", "asdf"]
        assert d["cookie"] == "foo, bar, asdf"

    def test_add_comma_separated_multiheader(self, d):
        d.add("bar", "foo")
        d.add("BAR", "bar")
        d.add("Bar", "asdf")
        assert d.getlist("bar") == ["foo", "bar", "asdf"]
        assert d["bar"] == "foo, bar, asdf"

    def test_extend_from_list(self, d):
        d.extend([("set-cookie", "100"), ("set-cookie", "200"), ("set-cookie", "300")])
        assert d["set-cookie"] == "100, 200, 300"

    def test_extend_from_dict(self, d):
        d.extend(dict(cookie="asdf"), b="100")
        assert d["cookie"] == "foo, bar, asdf"
        assert d["b"] == "100"
        d.add("cookie", "with, comma")
        assert d.getlist("cookie") == ["foo", "bar", "asdf", "with, comma"]

    def test_extend_from_container(self, d):
        h = NonMappingHeaderContainer(Cookie="foo", e="foofoo")
        d.extend(h)
        assert d["cookie"] == "foo, bar, foo"
        assert d["e"] == "foofoo"
        assert len(d) == 2

    def test_extend_from_headerdict(self, d):
        h = HTTPHeaderDict(Cookie="foo", e="foofoo")
        d.extend(h)
        assert d["cookie"] == "foo, bar, foo"
        assert d["e"] == "foofoo"
        assert len(d) == 2

    @pytest.mark.parametrize("args", [(1, 2), (1, 2, 3, 4, 5)])
    def test_extend_with_wrong_number_of_args_is_typeerror(self, d, args):
        with pytest.raises(TypeError) as err:
            d.extend(*args)
        assert "extend() takes at most 1 positional arguments" in err.value.args[0]

    def test_copy(self, d):
        h = d.copy()
        assert d is not h
        assert d == h

    def test_getlist(self, d):
        assert d.getlist("cookie") == ["foo", "bar"]
        assert d.getlist("Cookie") == ["foo", "bar"]
        assert d.getlist("b") == []
        d.add("b", "asdf")
        assert d.getlist("b") == ["asdf"]

    def test_getlist_after_copy(self, d):
        assert d.getlist("cookie") == HTTPHeaderDict(d).getlist("cookie")

    def test_equal(self, d):
        b = HTTPHeaderDict(cookie="foo, bar")
        c = NonMappingHeaderContainer(cookie="foo, bar")
        assert d == b
        assert d == c
        assert d != 2

    def test_not_equal(self, d):
        b = HTTPHeaderDict(cookie="foo, bar")
        c = NonMappingHeaderContainer(cookie="foo, bar")
        assert not (d != b)
        assert not (d != c)
        assert d != 2

    def test_pop(self, d):
        key = "Cookie"
        a = d[key]
        b = d.pop(key)
        assert a == b
        assert key not in d
        with pytest.raises(KeyError):
            d.pop(key)
        dummy = object()
        assert dummy is d.pop(key, dummy)

    def test_discard(self, d):
        d.discard("cookie")
        assert "cookie" not in d
        d.discard("cookie")

    def test_len(self, d):
        assert len(d) == 1
        d.add("cookie", "bla")
        d.add("asdf", "foo")
        # len determined by unique fieldnames
        assert len(d) == 2

    def test_repr(self, d):
        rep = "HTTPHeaderDict({'Cookie': 'foo, bar'})"
        assert repr(d) == rep

    def test_items(self, d):
        items = d.items()
        assert len(items) == 2
        assert items[0][0] == "Cookie"
        assert items[0][1] == "foo"
        assert items[1][0] == "Cookie"
        assert items[1][1] == "bar"

    def test_dict_conversion(self, d):
        # Also tested in connectionpool, needs to preserve case
        hdict = {
            "Content-Length": "0",
            "Content-type": "text/plain",
            "Server": "TornadoServer/1.2.3",
        }
        h = dict(HTTPHeaderDict(hdict).items())
        assert hdict == h
        assert hdict == dict(HTTPHeaderDict(hdict))

    def test_string_enforcement(self, d):
        # This currently throws AttributeError on key.lower(), should
        # probably be something nicer
        with pytest.raises(Exception):
            d[3] = 5
        with pytest.raises(Exception):
            d.add(3, 4)
        with pytest.raises(Exception):
            del d[3]
        with pytest.raises(Exception):
            HTTPHeaderDict({3: 3})

    @pytest.mark.skipif(
        not six.PY2, reason="python3 has a different internal header implementation"
    )
    def test_from_httplib_py2(self):
        msg = """
Server: nginx
Content-Type: text/html; charset=windows-1251
Connection: keep-alive
X-Some-Multiline: asdf
 asdf\t
\t asdf
Set-Cookie: bb_lastvisit=1348253375; expires=Sat, 21-Sep-2013 18:49:35 GMT; path=/
Set-Cookie: bb_lastactivity=0; expires=Sat, 21-Sep-2013 18:49:35 GMT; path=/
www-authenticate: asdf
www-authenticate: bla

"""
        buffer = six.moves.StringIO(msg.lstrip().replace("\n", "\r\n"))
        msg = six.moves.http_client.HTTPMessage(buffer)
        d = HTTPHeaderDict.from_httplib(msg)
        assert d["server"] == "nginx"
        cookies = d.getlist("set-cookie")
        assert len(cookies) == 2
        assert cookies[0].startswith("bb_lastvisit")
        assert cookies[1].startswith("bb_lastactivity")
        assert d["x-some-multiline"] == "asdf asdf asdf"
        assert d["www-authenticate"] == "asdf, bla"
        assert d.getlist("www-authenticate") == ["asdf", "bla"]
        with_invalid_multiline = """\tthis-is-not-a-header: but it has a pretend value
Authorization: Bearer 123

"""
        buffer = six.moves.StringIO(with_invalid_multiline.replace("\n", "\r\n"))
        msg = six.moves.http_client.HTTPMessage(buffer)
        with pytest.raises(InvalidHeader):
            HTTPHeaderDict.from_httplib(msg)