import cgi
from mod_pywebsocket import common
from mod_pywebsocket import msgutil


def web_socket_do_extra_handshake(request):
    pass


def web_socket_transfer_data(request):
    send_payload = ''
    r = request.ws_resource.split('?', 1)
    if len(r) == 2:
        params = cgi.parse_qs(r[1])
        if 'payload' in params:
            send_payload = params['payload'][0]

    msgutil.send_ping(request, send_payload)

    # We need to use an internal function to detect a pong frame from the client.
    opcode, recv_payload, final, reserved1, reserved2, reserved3 = request.ws_stream._receive_frame()
    if opcode == common.OPCODE_PONG and recv_payload == send_payload and final and not reserved1 and not reserved2 and not reserved3:
        msgutil.send_message(request, 'PASS')
    else:
        msgutil.send_message(request,
                             'FAIL: Received unexpected frame: opcode = %r, payload = %r, final = %r, reserved1 = %r, reserved2 = %r, reserved3 = %r' %
                             (opcode, recv_payload, final, reserved1, reserved2, reserved3))