# pylint: skip-file
from __future__ import absolute_import

from errno import EALREADY, EINPROGRESS, EISCONN, ECONNRESET
import socket
import time

import pytest

from kafka.conn import BrokerConnection, ConnectionStates
from kafka.protocol.api import RequestHeader
from kafka.protocol.metadata import MetadataRequest

import kafka.common as Errors


@pytest.fixture
def _socket(mocker):
    socket = mocker.MagicMock()
    socket.connect_ex.return_value = 0
    mocker.patch('socket.socket', return_value=socket)
    return socket


@pytest.fixture
def conn(_socket):
    conn = BrokerConnection('localhost', 9092, socket.AF_INET)
    return conn


@pytest.mark.parametrize("states", [
  (([EINPROGRESS, EALREADY], ConnectionStates.CONNECTING),),
  (([EALREADY, EALREADY], ConnectionStates.CONNECTING),),
  (([0], ConnectionStates.CONNECTED),),
  (([EINPROGRESS, EALREADY], ConnectionStates.CONNECTING),
   ([ECONNRESET], ConnectionStates.DISCONNECTED)),
  (([EINPROGRESS, EALREADY], ConnectionStates.CONNECTING),
   ([EALREADY], ConnectionStates.CONNECTING),
   ([EISCONN], ConnectionStates.CONNECTED)),
])
def test_connect(_socket, conn, states):
    assert conn.state is ConnectionStates.DISCONNECTED

    for errno, state in states:
        _socket.connect_ex.side_effect = errno
        conn.connect()
        assert conn.state is state


def test_connect_timeout(_socket, conn):
    assert conn.state is ConnectionStates.DISCONNECTED

    # Initial connect returns EINPROGRESS
    # immediate inline connect returns EALREADY
    # second explicit connect returns EALREADY
    # third explicit connect returns EALREADY and times out via last_attempt
    _socket.connect_ex.side_effect = [EINPROGRESS, EALREADY, EALREADY, EALREADY]
    conn.connect()
    assert conn.state is ConnectionStates.CONNECTING
    conn.connect()
    assert conn.state is ConnectionStates.CONNECTING
    conn.last_attempt = 0
    conn.connect()
    assert conn.state is ConnectionStates.DISCONNECTED


def test_blacked_out(conn):
    assert conn.blacked_out() is False
    conn.last_attempt = time.time()
    assert conn.blacked_out() is True


def test_connected(conn):
    assert conn.connected() is False
    conn.state = ConnectionStates.CONNECTED
    assert conn.connected() is True


def test_connecting(conn):
    assert conn.connecting() is False
    conn.state = ConnectionStates.CONNECTING
    assert conn.connecting() is True
    conn.state = ConnectionStates.CONNECTED
    assert conn.connecting() is False


def test_send_disconnected(conn):
    conn.state = ConnectionStates.DISCONNECTED
    f = conn.send('foobar')
    assert f.failed() is True
    assert isinstance(f.exception, Errors.ConnectionError)


def test_send_connecting(conn):
    conn.state = ConnectionStates.CONNECTING
    f = conn.send('foobar')
    assert f.failed() is True
    assert isinstance(f.exception, Errors.NodeNotReadyError)


def test_send_max_ifr(conn):
    conn.state = ConnectionStates.CONNECTED
    max_ifrs = conn.config['max_in_flight_requests_per_connection']
    for _ in range(max_ifrs):
        conn.in_flight_requests.append('foo')
    f = conn.send('foobar')
    assert f.failed() is True
    assert isinstance(f.exception, Errors.TooManyInFlightRequests)


def test_send_no_response(_socket, conn):
    conn.connect()
    assert conn.state is ConnectionStates.CONNECTED
    req = MetadataRequest[0]([])
    header = RequestHeader(req, client_id=conn.config['client_id'])
    payload_bytes = len(header.encode()) + len(req.encode())
    third = payload_bytes // 3
    remainder = payload_bytes % 3
    _socket.send.side_effect = [4, third, third, third, remainder]

    assert len(conn.in_flight_requests) == 0
    f = conn.send(req, expect_response=False)
    assert f.succeeded() is True
    assert f.value is None
    assert len(conn.in_flight_requests) == 0


def test_send_response(_socket, conn):
    conn.connect()
    assert conn.state is ConnectionStates.CONNECTED
    req = MetadataRequest[0]([])
    header = RequestHeader(req, client_id=conn.config['client_id'])
    payload_bytes = len(header.encode()) + len(req.encode())
    third = payload_bytes // 3
    remainder = payload_bytes % 3
    _socket.send.side_effect = [4, third, third, third, remainder]

    assert len(conn.in_flight_requests) == 0
    f = conn.send(req)
    assert f.is_done is False
    assert len(conn.in_flight_requests) == 1


def test_send_error(_socket, conn):
    conn.connect()
    assert conn.state is ConnectionStates.CONNECTED
    req = MetadataRequest[0]([])
    try:
        _socket.send.side_effect = ConnectionError
    except NameError:
        _socket.send.side_effect = socket.error
    f = conn.send(req)
    assert f.failed() is True
    assert isinstance(f.exception, Errors.ConnectionError)
    assert _socket.close.call_count == 1
    assert conn.state is ConnectionStates.DISCONNECTED


def test_can_send_more(conn):
    assert conn.can_send_more() is True
    max_ifrs = conn.config['max_in_flight_requests_per_connection']
    for _ in range(max_ifrs):
        assert conn.can_send_more() is True
        conn.in_flight_requests.append('foo')
    assert conn.can_send_more() is False


def test_recv_disconnected():
    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock.bind(('127.0.0.1', 0))
    port = sock.getsockname()[1]
    sock.listen(5)

    conn = BrokerConnection('127.0.0.1', port, socket.AF_INET)
    timeout = time.time() + 1
    while time.time() < timeout:
        conn.connect()
        if conn.connected():
            break
    else:
        assert False, 'Connection attempt to local socket timed-out ?'

    conn.send(MetadataRequest[0]([]))

    # Disconnect server socket
    sock.close()

    # Attempt to receive should mark connection as disconnected
    assert conn.connected()
    conn.recv()
    assert conn.disconnected()


def test_recv_disconnected_too(_socket, conn):
    conn.connect()
    assert conn.connected()

    req = MetadataRequest[0]([])
    header = RequestHeader(req, client_id=conn.config['client_id'])
    payload_bytes = len(header.encode()) + len(req.encode())
    _socket.send.side_effect = [4, payload_bytes]
    conn.send(req)

    # Empty data on recv means the socket is disconnected
    _socket.recv.return_value = b''

    # Attempt to receive should mark connection as disconnected
    assert conn.connected()
    conn.recv()
    assert conn.disconnected()


def test_recv(_socket, conn):
    pass # TODO


def test_close(conn):
    pass # TODO