#!/usr/bin/env python

# --------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Licensed under the MIT License. See License.txt in the project root for license information.
# --------------------------------------------------------------------------------------------

"""
Example to show scheduling messages to and cancelling messages from a Service Bus Queue.
"""

import os
import datetime
from azure.servicebus import ServiceBusClient, ServiceBusMessage
from azure.identity import DefaultAzureCredential

FULLY_QUALIFIED_NAMESPACE = os.environ['SERVICEBUS_FULLY_QUALIFIED_NAMESPACE']
TOPIC_NAME = os.environ["SERVICEBUS_TOPIC_NAME"]


def schedule_single_message(sender):
    message = ServiceBusMessage("Message to be scheduled")
    scheduled_time_utc = datetime.datetime.utcnow() + datetime.timedelta(seconds=30)
    sequence_number = sender.schedule_messages(message, scheduled_time_utc)
    return sequence_number


def schedule_multiple_messages(sender):
    messages_to_schedule = []
    for _ in range(10):
        messages_to_schedule.append(ServiceBusMessage("Message to be scheduled"))

    scheduled_time_utc = datetime.datetime.utcnow() + datetime.timedelta(seconds=30)
    sequence_numbers = sender.schedule_messages(
        messages_to_schedule, scheduled_time_utc
    )
    return sequence_numbers


def main():
    credential = DefaultAzureCredential()
    servicebus_client = ServiceBusClient(
        FULLY_QUALIFIED_NAMESPACE, credential, logging_enable=True
    )
    with servicebus_client:
        sender = servicebus_client.get_topic_sender(topic_name=TOPIC_NAME)
        with sender:
            sequence_number = schedule_single_message(sender)
            print(
                "Single message is scheduled and sequence number is {}".format(
                    sequence_number
                )
            )
            sequence_numbers = schedule_multiple_messages(sender)
            print(
                "Multiple messages are scheduled and sequence numbers are {}".format(
                    sequence_numbers
                )
            )

            sender.cancel_scheduled_messages(sequence_number)
            sender.cancel_scheduled_messages(sequence_numbers)
            print("All scheduled messages are cancelled.")


if __name__ == "__main__":
    main()
