#!/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 sending message(s) to a Service Bus Topic.
"""

import os
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 send_single_message(sender):
    message = ServiceBusMessage("Single Message")
    sender.send_messages(message)


def send_a_list_of_messages(sender):
    messages = [ServiceBusMessage("Message in list") for _ in range(10)]
    sender.send_messages(messages)


def send_batch_message(sender):
    batch_message = sender.create_message_batch()
    for _ in range(10):
        try:
            batch_message.add_message(ServiceBusMessage("Message inside ServiceBusMessageBatch"))
        except ValueError:
            # ServiceBusMessageBatch object reaches max_size.
            # New ServiceBusMessageBatch object can be created here to send more data.
            break
    sender.send_messages(batch_message)


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:
        send_single_message(sender)
        send_a_list_of_messages(sender)
        send_batch_message(sender)

print("Send message is done.")