import http
import logging
import socket
import socketserver
import ssl
import threading
import time
import unittest

from websockets.exceptions import (
    InvalidHandshake,
    InvalidMessage,
    InvalidStatus,
    InvalidURI,
)
from websockets.extensions.permessage_deflate import PerMessageDeflate
from websockets.sync.client import *

from ..utils import (
    CLIENT_CONTEXT,
    MS,
    SERVER_CONTEXT,
    DeprecationTestCase,
    temp_unix_socket_path,
)
from .server import get_uri, run_server, run_unix_server


class ClientTests(unittest.TestCase):
    def test_connection(self):
        """Client connects to server and the handshake succeeds."""
        with run_server() as server:
            with connect(get_uri(server)) as client:
                self.assertEqual(client.protocol.state.name, "OPEN")

    def test_existing_socket(self):
        """Client connects using a pre-existing socket."""
        with run_server() as server:
            with socket.create_connection(server.socket.getsockname()) as sock:
                # Use a non-existing domain to ensure we connect to the right socket.
                with connect("ws://invalid/", sock=sock) as client:
                    self.assertEqual(client.protocol.state.name, "OPEN")

    def test_additional_headers(self):
        """Client can set additional headers with additional_headers."""
        with run_server() as server:
            with connect(
                get_uri(server), additional_headers={"Authorization": "Bearer ..."}
            ) as client:
                self.assertEqual(client.request.headers["Authorization"], "Bearer ...")

    def test_override_user_agent(self):
        """Client can override User-Agent header with user_agent_header."""
        with run_server() as server:
            with connect(get_uri(server), user_agent_header="Smith") as client:
                self.assertEqual(client.request.headers["User-Agent"], "Smith")

    def test_remove_user_agent(self):
        """Client can remove User-Agent header with user_agent_header."""
        with run_server() as server:
            with connect(get_uri(server), user_agent_header=None) as client:
                self.assertNotIn("User-Agent", client.request.headers)

    def test_compression_is_enabled(self):
        """Client enables compression by default."""
        with run_server() as server:
            with connect(get_uri(server)) as client:
                self.assertEqual(
                    [type(ext) for ext in client.protocol.extensions],
                    [PerMessageDeflate],
                )

    def test_disable_compression(self):
        """Client disables compression."""
        with run_server() as server:
            with connect(get_uri(server), compression=None) as client:
                self.assertEqual(client.protocol.extensions, [])

    def test_logger(self):
        """Client accepts a logger argument."""
        logger = logging.getLogger("test")
        with run_server() as server:
            with connect(get_uri(server), logger=logger) as client:
                self.assertEqual(client.logger.name, logger.name)

    def test_custom_connection_factory(self):
        """Client runs ClientConnection factory provided in create_connection."""

        def create_connection(*args, **kwargs):
            client = ClientConnection(*args, **kwargs)
            client.create_connection_ran = True
            return client

        with run_server() as server:
            with connect(
                get_uri(server), create_connection=create_connection
            ) as client:
                self.assertTrue(client.create_connection_ran)

    def test_invalid_uri(self):
        """Client receives an invalid URI."""
        with self.assertRaises(InvalidURI):
            with connect("http://localhost"):  # invalid scheme
                self.fail("did not raise")

    def test_tcp_connection_fails(self):
        """Client fails to connect to server."""
        with self.assertRaises(OSError):
            with connect("ws://localhost:54321"):  # invalid port
                self.fail("did not raise")

    def test_handshake_fails(self):
        """Client connects to server but the handshake fails."""

        def remove_accept_header(self, request, response):
            del response.headers["Sec-WebSocket-Accept"]

        # The connection will be open for the server but failed for the client.
        # Use a connection handler that exits immediately to avoid an exception.
        with run_server(process_response=remove_accept_header) as server:
            with self.assertRaises(InvalidHandshake) as raised:
                with connect(get_uri(server) + "/no-op", close_timeout=MS):
                    self.fail("did not raise")
            self.assertEqual(
                str(raised.exception),
                "missing Sec-WebSocket-Accept header",
            )

    def test_timeout_during_handshake(self):
        """Client times out before receiving handshake response from server."""
        gate = threading.Event()

        def stall_connection(self, request):
            gate.wait()

        # The connection will be open for the server but failed for the client.
        # Use a connection handler that exits immediately to avoid an exception.
        with run_server(process_request=stall_connection) as server:
            try:
                with self.assertRaises(TimeoutError) as raised:
                    with connect(get_uri(server) + "/no-op", open_timeout=2 * MS):
                        self.fail("did not raise")
                self.assertEqual(
                    str(raised.exception),
                    "timed out during handshake",
                )
            finally:
                gate.set()

    def test_connection_closed_during_handshake(self):
        """Client reads EOF before receiving handshake response from server."""

        def close_connection(self, request):
            self.socket.shutdown(socket.SHUT_RDWR)
            self.socket.close()

        with run_server(process_request=close_connection) as server:
            with self.assertRaises(InvalidMessage) as raised:
                with connect(get_uri(server)):
                    self.fail("did not raise")
            self.assertEqual(
                str(raised.exception),
                "did not receive a valid HTTP response",
            )
            self.assertIsInstance(raised.exception.__cause__, EOFError)
            self.assertEqual(
                str(raised.exception.__cause__),
                "connection closed while reading HTTP status line",
            )

    def test_http_response(self):
        """Client reads HTTP response."""

        def http_response(connection, request):
            return connection.respond(http.HTTPStatus.OK, "👌")

        with run_server(process_request=http_response) as server:
            with self.assertRaises(InvalidStatus) as raised:
                with connect(get_uri(server)):
                    self.fail("did not raise")

        self.assertEqual(raised.exception.response.status_code, 200)
        self.assertEqual(raised.exception.response.body.decode(), "👌")

    def test_http_response_without_content_length(self):
        """Client reads HTTP response without a Content-Length header."""

        def http_response(connection, request):
            response = connection.respond(http.HTTPStatus.OK, "👌")
            del response.headers["Content-Length"]
            return response

        with run_server(process_request=http_response) as server:
            with self.assertRaises(InvalidStatus) as raised:
                with connect(get_uri(server)):
                    self.fail("did not raise")

        self.assertEqual(raised.exception.response.status_code, 200)
        self.assertEqual(raised.exception.response.body.decode(), "👌")

    def test_junk_handshake(self):
        """Client closes the connection when receiving non-HTTP response from server."""

        class JunkHandler(socketserver.BaseRequestHandler):
            def handle(self):
                time.sleep(MS)  # wait for the client to send the handshake request
                self.request.send(b"220 smtp.invalid ESMTP Postfix\r\n")
                self.request.recv(4096)  # wait for the client to close the connection
                self.request.close()

        server = socketserver.TCPServer(("localhost", 0), JunkHandler)
        host, port = server.server_address
        with server:
            thread = threading.Thread(target=server.serve_forever, args=(MS,))
            thread.start()
            try:
                with self.assertRaises(InvalidMessage) as raised:
                    with connect(f"ws://{host}:{port}"):
                        self.fail("did not raise")
                self.assertEqual(
                    str(raised.exception),
                    "did not receive a valid HTTP response",
                )
                self.assertIsInstance(raised.exception.__cause__, ValueError)
                self.assertEqual(
                    str(raised.exception.__cause__),
                    "unsupported protocol; expected HTTP/1.1: "
                    "220 smtp.invalid ESMTP Postfix",
                )
            finally:
                server.shutdown()
                thread.join()


class SecureClientTests(unittest.TestCase):
    def test_connection(self):
        """Client connects to server securely."""
        with run_server(ssl=SERVER_CONTEXT) as server:
            with connect(get_uri(server), ssl=CLIENT_CONTEXT) as client:
                self.assertEqual(client.protocol.state.name, "OPEN")
                self.assertEqual(client.socket.version()[:3], "TLS")

    def test_set_server_hostname_implicitly(self):
        """Client sets server_hostname to the host in the WebSocket URI."""
        with temp_unix_socket_path() as path:
            with run_unix_server(path, ssl=SERVER_CONTEXT):
                with unix_connect(
                    path, ssl=CLIENT_CONTEXT, uri="wss://overridden/"
                ) as client:
                    self.assertEqual(client.socket.server_hostname, "overridden")

    def test_set_server_hostname_explicitly(self):
        """Client sets server_hostname to the value provided in argument."""
        with temp_unix_socket_path() as path:
            with run_unix_server(path, ssl=SERVER_CONTEXT):
                with unix_connect(
                    path, ssl=CLIENT_CONTEXT, server_hostname="overridden"
                ) as client:
                    self.assertEqual(client.socket.server_hostname, "overridden")

    def test_reject_invalid_server_certificate(self):
        """Client rejects certificate where server certificate isn't trusted."""
        with run_server(ssl=SERVER_CONTEXT) as server:
            with self.assertRaises(ssl.SSLCertVerificationError) as raised:
                # The test certificate isn't trusted system-wide.
                with connect(get_uri(server)):
                    self.fail("did not raise")
            self.assertIn(
                "certificate verify failed: self signed certificate",
                str(raised.exception).replace("-", " "),
            )

    def test_reject_invalid_server_hostname(self):
        """Client rejects certificate where server hostname doesn't match."""
        with run_server(ssl=SERVER_CONTEXT) as server:
            with self.assertRaises(ssl.SSLCertVerificationError) as raised:
                # This hostname isn't included in the test certificate.
                with connect(
                    get_uri(server), ssl=CLIENT_CONTEXT, server_hostname="invalid"
                ):
                    self.fail("did not raise")
            self.assertIn(
                "certificate verify failed: Hostname mismatch",
                str(raised.exception),
            )


@unittest.skipUnless(hasattr(socket, "AF_UNIX"), "this test requires Unix sockets")
class UnixClientTests(unittest.TestCase):
    def test_connection(self):
        """Client connects to server over a Unix socket."""
        with temp_unix_socket_path() as path:
            with run_unix_server(path):
                with unix_connect(path) as client:
                    self.assertEqual(client.protocol.state.name, "OPEN")

    def test_set_host_header(self):
        """Client sets the Host header to the host in the WebSocket URI."""
        # This is part of the documented behavior of unix_connect().
        with temp_unix_socket_path() as path:
            with run_unix_server(path):
                with unix_connect(path, uri="ws://overridden/") as client:
                    self.assertEqual(client.request.headers["Host"], "overridden")


@unittest.skipUnless(hasattr(socket, "AF_UNIX"), "this test requires Unix sockets")
class SecureUnixClientTests(unittest.TestCase):
    def test_connection(self):
        """Client connects to server securely over a Unix socket."""
        with temp_unix_socket_path() as path:
            with run_unix_server(path, ssl=SERVER_CONTEXT):
                with unix_connect(path, ssl=CLIENT_CONTEXT) as client:
                    self.assertEqual(client.protocol.state.name, "OPEN")
                    self.assertEqual(client.socket.version()[:3], "TLS")

    def test_set_server_hostname(self):
        """Client sets server_hostname to the host in the WebSocket URI."""
        # This is part of the documented behavior of unix_connect().
        with temp_unix_socket_path() as path:
            with run_unix_server(path, ssl=SERVER_CONTEXT):
                with unix_connect(
                    path, ssl=CLIENT_CONTEXT, uri="wss://overridden/"
                ) as client:
                    self.assertEqual(client.socket.server_hostname, "overridden")


class ClientUsageErrorsTests(unittest.TestCase):
    def test_ssl_without_secure_uri(self):
        """Client rejects ssl when URI isn't secure."""
        with self.assertRaises(ValueError) as raised:
            connect("ws://localhost/", ssl=CLIENT_CONTEXT)
        self.assertEqual(
            str(raised.exception),
            "ssl argument is incompatible with a ws:// URI",
        )

    def test_unix_without_path_or_sock(self):
        """Unix client requires path when sock isn't provided."""
        with self.assertRaises(ValueError) as raised:
            unix_connect()
        self.assertEqual(
            str(raised.exception),
            "missing path argument",
        )

    def test_unix_with_path_and_sock(self):
        """Unix client rejects path when sock is provided."""
        sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
        self.addCleanup(sock.close)
        with self.assertRaises(ValueError) as raised:
            unix_connect(path="/", sock=sock)
        self.assertEqual(
            str(raised.exception),
            "path and sock arguments are incompatible",
        )

    def test_invalid_subprotocol(self):
        """Client rejects single value of subprotocols."""
        with self.assertRaises(TypeError) as raised:
            connect("ws://localhost/", subprotocols="chat")
        self.assertEqual(
            str(raised.exception),
            "subprotocols must be a list, not a str",
        )

    def test_unsupported_compression(self):
        """Client rejects incorrect value of compression."""
        with self.assertRaises(ValueError) as raised:
            connect("ws://localhost/", compression=False)
        self.assertEqual(
            str(raised.exception),
            "unsupported compression: False",
        )


class BackwardsCompatibilityTests(DeprecationTestCase):
    def test_ssl_context_argument(self):
        """Client supports the deprecated ssl_context argument."""
        with run_server(ssl=SERVER_CONTEXT) as server:
            with self.assertDeprecationWarning("ssl_context was renamed to ssl"):
                with connect(get_uri(server), ssl_context=CLIENT_CONTEXT):
                    pass
