#!/usr/bin/env python3
#
# (C) 2020-2021 by Harald Welte <laforge@osmocom.org>
#
# SPDX-License-Identifier: MIT
#
# This is a simplistic program to show how the REST API of osmo-cbc can be used to
# create and delete Cell Broadcast Messages
#
# A lot of the parameters are currently hard-coded, see the 'js' variable definitions
# below.

import sys
import argparse
import requests


def build_url(suffix):
    BASE_PATH= "/api/ecbe/v1"
    return "http://%s:%u%s%s" % (server_host, server_port, BASE_PATH, suffix)


def rest_post(suffix, js = None):
    url = build_url(suffix)
    if verbose:
        print("POST %s (%s)" % (url, str(js)))
    resp = requests.post(url, json=js)
    if verbose:
        print("-> %s" % (resp))
    if not resp.ok:
        print("POST failed")
    return resp

def rest_delete(suffix, js = None):
    url = build_url(suffix)
    if verbose:
        print("DELETE %s (%s)" % (url, str(js)))
    resp = requests.delete(url, json=js)
    if verbose:
        print("-> %s" % (resp))
    if not resp.ok:
        print("DELETE failed " + str(resp))
    return resp


def do_create_cbs(args):
    js = {
        'cbe_name': "cbc_apitool",
        'category': "normal",
        'repetition_period': args.repetition_period,
        'num_of_bcast': args.num_of_bcast,
        'scope': {
            'scope_plmn': { }
        },
        'smscb_message': {
            'message_id': args.msg_id,
            'serial_nr': {
                'serial_nr_decoded': {
                    'geo_scope': "plmn_wide",
                    'msg_code': args.msg_code,
                    'update_nr': args.update_nr
                }
            },
            'payload': {
                'payload_decoded': {
                    'character_set': args.character_set,
                    #'language': 'en',
                    'data_utf8': args.payload_data_utf8,
                    #'data_utf8': "Mahlzeit1 Mahlzeit2 Mahlzeit3 Mahlzeit4 Mahlzeit5 Mahlzeit6 Mahlzeit7 Mahlzeit8"
                    #'data_utf8': "Mahlzeit1 Mahlzeit2 Mahlzeit3 Mahlzeit4 Mahlzeit5 Mahlzeit6 Mahlzeit7 Mahlzeit8 Mahlzeit9 Mahlzeit10 Mahlzeti11 Mahlzeit12 Mahlzeit13 Mahlzeit14 Mahlzeit15 Mahlzeit16 Mahlzeit17 Mahlzeit18 Mahlzeit19 Mahlzeit20 Mahlzeit21 Mahlzeit22 Mahlzeit23 Mahlzeit24 Mahlzeit25 Mahlzeit26 Mahlzeit27 Mahlzeit28"
                }
            }
        }
    }
    rest_post("/message", js);

def do_create_etws(args):
    js = {
        'cbe_name': "cbc_apitool",
        'category': "normal",
        'repetition_period': args.repetition_period,
        'num_of_bcast': args.num_of_bcast,
        'scope': {
            'scope_plmn': { }
        },
        'smscb_message': {
            'message_id': args.msg_id,
            'serial_nr': {
                'serial_nr_decoded': {
                    'geo_scope': "plmn_wide",
                    'msg_code': args.msg_code,
                    'update_nr': args.update_nr
                }
            },
            'payload': {
                'payload_etws': {
                    'warning_type': {
                        'warning_type_decoded': 'earthquake'
                    },
                    'emergency_user_alert': True,
                    'popup_on_display': True
                }
            }
        }
    }
    rest_post("/message", js);


def do_delete(args):
    rest_delete("/message/%u" % (args.msg_id))

def main(argv):
    global server_port, server_host, verbose

    parser = argparse.ArgumentParser()
    parser.add_argument("-H", "--host", help="Host to connect to", default="localhost")
    parser.add_argument("-p", "--port", help="TCP port to connect to", type=int, default=12345)
    parser.add_argument("-v", "--verbose", help="increase output verbosity", action='count', default=0)

    subparsers = parser.add_subparsers(required=True)

    parser_c_cbs = subparsers.add_parser('create-cbs', help='Create a new CBS message')
    parser_c_cbs.add_argument("--msg-id", type=int, help='Message Identifier', required=True)
    parser_c_cbs.add_argument("--msg-code", type=int, help='Message Code', default=768)
    parser_c_cbs.add_argument("--update-nr", type=int, help='Update Number', default=0)
    parser_c_cbs.add_argument("--repetition-period", type=int, help='Repetition Period', default=5)
    parser_c_cbs.add_argument("--num-of-bcast", type=int, help='Number of Broadcasts', default=999)
    parser_c_cbs.add_argument("--payload-data-utf8", type=str, help='Payload Data in UTF8', required=True)
    parser_c_cbs.add_argument("--character-set", type=str, help='Character Set', default="gsm", choices=["gsm","ucs2","8bit"])
    parser_c_cbs.set_defaults(func=do_create_cbs)

    parser_c_etws = subparsers.add_parser('create-etws', help='Create a new ETWS message')
    parser_c_etws.add_argument("--msg-id", type=int, help='Message Identifier', required=True)
    parser_c_etws.add_argument("--msg-code", type=int, help='Message Code', default=768)
    parser_c_etws.add_argument("--update-nr", type=int, help='Update Number', default=0)
    parser_c_etws.add_argument("--repetition-period", type=int, help='Repetition Period', default=5)
    parser_c_etws.add_argument("--num-of-bcast", type=int, help='Number of Broadcasts', default=999)
    parser_c_etws.set_defaults(func=do_create_etws)

    parser_delete = subparsers.add_parser('delete', help='Delete a message')
    parser_delete.add_argument("--msg-id", type=int, help='Message Identifier', required=True)
    parser_delete.set_defaults(func=do_delete)

    argv = sys.argv
    if len(sys.argv) == 1:
        args = parser.parse_args(['-h'])
    else:
        args = parser.parse_args()

    server_host = args.host
    server_port = args.port
    verbose = args.verbose

    args.func(args)


if __name__ == "__main__":
    main(sys.argv)