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/*******************************************************************************
 Copyright (c) Microsoft Open Technologies (Shanghai) Company Limited.  All rights reserved.

 The MIT License (MIT)

 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
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package com.sitewhere.azure.device.communication.client;

import org.apache.qpid.amqp_1_0.client.Connection;
import org.apache.qpid.amqp_1_0.client.ConnectionErrorException;
import org.apache.qpid.amqp_1_0.client.ConnectionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class EventHubClient {

    private static final String DefaultConsumerGroupName = "$default";
    private static final Logger logger = LoggerFactory.getLogger(EventHubClient.class);
    private static final long ConnectionSyncTimeout = 60000L;

    private final String connectionString;
    private final String entityPath;
    private final Connection connection;

    private EventHubClient(String connectionString, String entityPath) throws EventHubException {
        this.connectionString = connectionString;
        this.entityPath = entityPath;
        this.connection = this.createConnection();
    }

    /**
     * creates a new instance of EventHubClient using the supplied connection string and entity path.
     *
     * @param connectionString connection string to the namespace of event hubs. connection string format:
     *                         amqps://{userId}:{password}@{namespaceName}.servicebus.windows.net
     * @param entityPath       the name of event hub entity.
     * @return EventHubClient
     * @throws EventHubException
     */
    public static EventHubClient create(String connectionString, String entityPath) throws EventHubException {
        return new EventHubClient(connectionString, entityPath);
    }

    public EventHubSender createPartitionSender(String partitionId) throws Exception {
        return new EventHubSender(this.connection.createSession(), this.entityPath, partitionId);
    }

    public EventHubConsumerGroup getDefaultConsumerGroup() {
        return new EventHubConsumerGroup(this.connection, this.entityPath, DefaultConsumerGroupName);
    }

    public void close() {
        try {
            this.connection.close();
        } catch (ConnectionErrorException e) {
            logger.error(e.toString());
        }
    }

    private Connection createConnection() throws EventHubException {
        ConnectionStringBuilder connectionStringBuilder = new ConnectionStringBuilder(this.connectionString);
        Connection clientConnection;

        try {
            clientConnection = new Connection(
                    connectionStringBuilder.getHost(),
                    connectionStringBuilder.getPort(),
                    connectionStringBuilder.getUserName(),
                    connectionStringBuilder.getPassword(),
                    connectionStringBuilder.getHost(),
                    connectionStringBuilder.getSsl());
        } catch (ConnectionException e) {
            logger.error(e.toString());
            throw new EventHubException(e);
        }
        clientConnection.getEndpoint().setSyncTimeout(ConnectionSyncTimeout);
        SelectorFilterWriter.register(clientConnection.getEndpoint().getDescribedTypeRegistry());
        return clientConnection;
    }
}