import asyncio
import socket
import unittest

from uvloop import _testbase as tb


def patched_getaddrinfo(*args, **kwargs):
    # corrected socket.getaddrinfo() behavior: ai_canonname always follows the
    # flag AI_CANONNAME, even if `host` is an IP
    rv = []
    result = socket.getaddrinfo(*args, **kwargs)
    for af, sk, proto, canon_name, addr in result:
        if kwargs.get('flags', 0) & socket.AI_CANONNAME:
            if not canon_name:
                canon_name = args[0]
                if not isinstance(canon_name, str):
                    canon_name = canon_name.decode('ascii')
        elif canon_name:
            canon_name = ''
        rv.append((af, sk, proto, canon_name, addr))
    return rv


class BaseTestDNS:

    def _test_getaddrinfo(self, *args, _patch=False, **kwargs):
        err = None
        try:
            if _patch:
                a1 = patched_getaddrinfo(*args, **kwargs)
            else:
                a1 = socket.getaddrinfo(*args, **kwargs)
        except (socket.gaierror, UnicodeError) as ex:
            err = ex

        try:
            a2 = self.loop.run_until_complete(
                self.loop.getaddrinfo(*args, **kwargs))
        except (socket.gaierror, UnicodeError) as ex:
            if err is not None:
                self.assertEqual(ex.args, err.args)
            else:
                ex.__context__ = err
                raise ex
        except OSError as ex:
            ex.__context__ = err
            raise ex
        else:
            if err is not None:
                raise err

            self.assertEqual(a1, a2)

    def _test_getnameinfo(self, *args, **kwargs):
        err = None
        try:
            a1 = socket.getnameinfo(*args, **kwargs)
        except Exception as ex:
            err = ex

        try:
            a2 = self.loop.run_until_complete(
                self.loop.getnameinfo(*args, **kwargs))
        except Exception as ex:
            if err is not None:
                if ex.__class__ is not err.__class__:
                    print(ex, err)
                self.assertIs(ex.__class__, err.__class__)
                self.assertEqual(ex.args, err.args)
            else:
                raise
        else:
            if err is not None:
                raise err

            self.assertEqual(a1, a2)

    def test_getaddrinfo_1(self):
        self._test_getaddrinfo('example.com', 80)
        self._test_getaddrinfo('example.com', 80, type=socket.SOCK_STREAM)

    def test_getaddrinfo_2(self):
        self._test_getaddrinfo('example.com', 80, flags=socket.AI_CANONNAME)

    def test_getaddrinfo_3(self):
        self._test_getaddrinfo('a' + '1' * 50 + '.wat', 800)

    def test_getaddrinfo_4(self):
        self._test_getaddrinfo('example.com', 80, family=-1)
        self._test_getaddrinfo('example.com', 80, type=socket.SOCK_STREAM,
                               family=-1)

    def test_getaddrinfo_5(self):
        self._test_getaddrinfo('example.com', '80')
        self._test_getaddrinfo('example.com', '80', type=socket.SOCK_STREAM)

    def test_getaddrinfo_6(self):
        self._test_getaddrinfo(b'example.com', b'80')
        self._test_getaddrinfo(b'example.com', b'80', type=socket.SOCK_STREAM)

    def test_getaddrinfo_7(self):
        self._test_getaddrinfo(None, 0)
        self._test_getaddrinfo(None, 0, type=socket.SOCK_STREAM)

    def test_getaddrinfo_8(self):
        self._test_getaddrinfo('', 0)
        self._test_getaddrinfo('', 0, type=socket.SOCK_STREAM)

    def test_getaddrinfo_9(self):
        self._test_getaddrinfo(b'', 0)
        self._test_getaddrinfo(b'', 0, type=socket.SOCK_STREAM)

    def test_getaddrinfo_10(self):
        self._test_getaddrinfo(None, None)
        self._test_getaddrinfo(None, None, type=socket.SOCK_STREAM)

    def test_getaddrinfo_11(self):
        self._test_getaddrinfo(b'example.com', '80')
        self._test_getaddrinfo(b'example.com', '80', type=socket.SOCK_STREAM)

    def test_getaddrinfo_12(self):
        # musl always returns ai_canonname but we don't
        patch = self.implementation != 'asyncio'

        self._test_getaddrinfo('127.0.0.1', '80')
        self._test_getaddrinfo('127.0.0.1', '80', type=socket.SOCK_STREAM,
                               _patch=patch)

    def test_getaddrinfo_13(self):
        # musl always returns ai_canonname but we don't
        patch = self.implementation != 'asyncio'

        self._test_getaddrinfo(b'127.0.0.1', b'80')
        self._test_getaddrinfo(b'127.0.0.1', b'80', type=socket.SOCK_STREAM,
                               _patch=patch)

    def test_getaddrinfo_14(self):
        # musl always returns ai_canonname but we don't
        patch = self.implementation != 'asyncio'

        self._test_getaddrinfo(b'127.0.0.1', b'http')
        self._test_getaddrinfo(b'127.0.0.1', b'http', type=socket.SOCK_STREAM,
                               _patch=patch)

    def test_getaddrinfo_15(self):
        # musl always returns ai_canonname but we don't
        patch = self.implementation != 'asyncio'

        self._test_getaddrinfo('127.0.0.1', 'http')
        self._test_getaddrinfo('127.0.0.1', 'http', type=socket.SOCK_STREAM,
                               _patch=patch)

    def test_getaddrinfo_16(self):
        self._test_getaddrinfo('localhost', 'http')
        self._test_getaddrinfo('localhost', 'http', type=socket.SOCK_STREAM)

    def test_getaddrinfo_17(self):
        self._test_getaddrinfo(b'localhost', 'http')
        self._test_getaddrinfo(b'localhost', 'http', type=socket.SOCK_STREAM)

    def test_getaddrinfo_18(self):
        self._test_getaddrinfo('localhost', b'http')
        self._test_getaddrinfo('localhost', b'http', type=socket.SOCK_STREAM)

    def test_getaddrinfo_19(self):
        # musl always returns ai_canonname while macOS never return for IPs,
        # but we strictly follow the docs to use the AI_CANONNAME flag in a
        # shortcut __static_getaddrinfo_pyaddr()
        patch = self.implementation != 'asyncio'

        self._test_getaddrinfo('::1', 80)
        self._test_getaddrinfo('::1', 80, type=socket.SOCK_STREAM,
                               _patch=patch)
        self._test_getaddrinfo('::1', 80, type=socket.SOCK_STREAM,
                               flags=socket.AI_CANONNAME, _patch=patch)

    def test_getaddrinfo_20(self):
        # musl always returns ai_canonname while macOS never return for IPs,
        # but we strictly follow the docs to use the AI_CANONNAME flag in a
        # shortcut __static_getaddrinfo_pyaddr()
        patch = self.implementation != 'asyncio'

        self._test_getaddrinfo('127.0.0.1', 80)
        self._test_getaddrinfo('127.0.0.1', 80, type=socket.SOCK_STREAM,
                               _patch=patch)
        self._test_getaddrinfo('127.0.0.1', 80, type=socket.SOCK_STREAM,
                               flags=socket.AI_CANONNAME, _patch=patch)

    # https://github.com/libuv/libuv/security/advisories/GHSA-f74f-cvh7-c6q6
    # See also: https://github.com/MagicStack/uvloop/pull/600
    def test_getaddrinfo_21(self):
        payload = f'0x{"0" * 246}7f000001.example.com'.encode('ascii')
        self._test_getaddrinfo(payload, 80)
        self._test_getaddrinfo(payload, 80, type=socket.SOCK_STREAM)

    def test_getaddrinfo_22(self):
        payload = f'0x{"0" * 246}7f000001.example.com'
        self._test_getaddrinfo(payload, 80)
        self._test_getaddrinfo(payload, 80, type=socket.SOCK_STREAM)

    ######

    def test_getnameinfo_1(self):
        self._test_getnameinfo(('127.0.0.1', 80), 0)

    def test_getnameinfo_2(self):
        self._test_getnameinfo(('127.0.0.1', 80, 1231231231213), 0)

    def test_getnameinfo_3(self):
        self._test_getnameinfo(('127.0.0.1', 80, 0, 0), 0)

    def test_getnameinfo_4(self):
        self._test_getnameinfo(('::1', 80), 0)

    def test_getnameinfo_5(self):
        self._test_getnameinfo(('localhost', 8080), 0)


class Test_UV_DNS(BaseTestDNS, tb.UVTestCase):

    def test_getaddrinfo_close_loop(self):
        # Test that we can close the loop with a running
        # DNS query.

        try:
            # Check that we have internet connection
            socket.getaddrinfo('example.com', 80)
        except socket.error:
            raise unittest.SkipTest

        async def run():
            fut = self.loop.create_task(
                self.loop.getaddrinfo('example.com', 80))
            await asyncio.sleep(0)
            fut.cancel()
            self.loop.stop()

        try:
            self.loop.run_until_complete(run())
        finally:
            self.loop.close()


class Test_AIO_DNS(BaseTestDNS, tb.AIOTestCase):
    pass