# CorrelationExample.py
from __future__ import print_function
from __future__ import absolute_import

from optparse import OptionParser

import os
import platform as plat
import sys
if sys.version_info >= (3, 8) and plat.system().lower() == "windows":
    # pylint: disable=no-member
    with os.add_dll_directory(os.getenv('BLPAPI_LIBDIR')):
        import blpapi
else:
    import blpapi

class Window(object):
    def __init__(self, name):
        self.name = name

    def displaySecurityInfo(self, msg):
        print("%s: %s" % (self.name, msg))


def parseCmdLine():
    parser = OptionParser(description="Retrieve reference data.")
    parser.add_option("-a",
                      "--ip",
                      dest="host",
                      help="server name or IP (default: %default)",
                      metavar="ipAddress",
                      default="localhost")
    parser.add_option("-p",
                      dest="port",
                      type="int",
                      help="server port (default: %default)",
                      metavar="tcpPort",
                      default=8194)

    (options, args) = parser.parse_args()

    return options


def startSession(session):
    if not session.start():
        print("Failed to connect!")
        return False

    if not session.openService("//blp/refdata"):
        print("Failed to open //blp/refdata")
        session.stop()
        return False

    return True


def main():
    global options
    options = parseCmdLine()

    # Fill SessionOptions
    sessionOptions = blpapi.SessionOptions()
    sessionOptions.setServerHost(options.host)
    sessionOptions.setServerPort(options.port)

    print("Connecting to %s:%d" % (options.host, options.port))

    # Create a Session
    session = blpapi.Session(sessionOptions)

    # Start a Session
    if not startSession(session):
        return

    refDataService = session.getService("//blp/refdata")
    request = refDataService.createRequest("ReferenceDataRequest")
    request.append("securities", "IBM US Equity")
    request.append("fields", "PX_LAST")
    request.append("fields", "DS002")

    secInfoWindow = Window("SecurityInfo")
    cid = blpapi.CorrelationId(secInfoWindow)

    print("Sending Request:", request)
    session.sendRequest(request, correlationId=cid)

    try:
        # Process received events
        while(True):
            # We provide timeout to give the chance to Ctrl+C handling:
            event = session.nextEvent(500)
            for msg in event:
                if event.eventType() == blpapi.Event.RESPONSE or \
                        event.eventType() == blpapi.Event.PARTIAL_RESPONSE:
                    window = msg.correlationIds()[0].value()
                    window.displaySecurityInfo(msg)

            # Response completely received, so we could exit
            if event.eventType() == blpapi.Event.RESPONSE:
                break
    finally:
        # Stop the session
        session.stop()

if __name__ == "__main__":
    print("CorrelationExample")
    try:
        main()
    except KeyboardInterrupt:
        print("Ctrl+C pressed. Stopping...")

__copyright__ = """
Copyright 2012. Bloomberg Finance L.P.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to
deal in the Software without restriction, including without limitation the
rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:  The above
copyright notice and this permission notice shall be included in all copies
or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN THE SOFTWARE.
"""