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/*
 * Copyright 2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file is distributed
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either
 * express or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

package com.amazonaws.services.iot.client.sample.shadow;

import com.amazonaws.services.iot.client.AWSIotConnectionStatus;
import com.amazonaws.services.iot.client.AWSIotDevice;
import com.amazonaws.services.iot.client.AWSIotException;
import com.amazonaws.services.iot.client.AWSIotMessage;
import com.amazonaws.services.iot.client.AWSIotMqttClient;
import com.amazonaws.services.iot.client.AWSIotQos;
import com.amazonaws.services.iot.client.sample.sampleUtil.CommandArguments;
import com.amazonaws.services.iot.client.sample.sampleUtil.SampleUtil;
import com.amazonaws.services.iot.client.sample.sampleUtil.SampleUtil.KeyStorePasswordPair;

/**
 * This example demonstrates how to use {@link AWSIotMqttClient} and a derived
 * {@link AWSIotDevice} to keep the device connected with its shadow in the
 * cloud. This is the recommended way of accessing a shadow and keeping it
 * synchronized with the device. The only thing the application needs to provide
 * in the derived class is the annotated device properties and their
 * corresponding getter and setter methods.
 */
public class ShadowSample {

    private static AWSIotMqttClient awsIotClient;

    public static void setClient(AWSIotMqttClient client) {
        awsIotClient = client;
    }

    private static void initClient(CommandArguments arguments) {
        String clientEndpoint = arguments.getNotNull("clientEndpoint", SampleUtil.getConfig("clientEndpoint"));
        String clientId = arguments.getNotNull("clientId", SampleUtil.getConfig("clientId"));

        String certificateFile = arguments.get("certificateFile", SampleUtil.getConfig("certificateFile"));
        String privateKeyFile = arguments.get("privateKeyFile", SampleUtil.getConfig("privateKeyFile"));
        if (awsIotClient == null && certificateFile != null && privateKeyFile != null) {
            String algorithm = arguments.get("keyAlgorithm", SampleUtil.getConfig("keyAlgorithm"));
            KeyStorePasswordPair pair = SampleUtil.getKeyStorePasswordPair(certificateFile, privateKeyFile, algorithm);

            awsIotClient = new AWSIotMqttClient(clientEndpoint, clientId, pair.keyStore, pair.keyPassword);
        }

        if (awsIotClient == null) {
            String awsAccessKeyId = arguments.get("awsAccessKeyId", SampleUtil.getConfig("awsAccessKeyId"));
            String awsSecretAccessKey = arguments.get("awsSecretAccessKey", SampleUtil.getConfig("awsSecretAccessKey"));
            String sessionToken = arguments.get("sessionToken", SampleUtil.getConfig("sessionToken"));

            if (awsAccessKeyId != null && awsSecretAccessKey != null) {
                awsIotClient = new AWSIotMqttClient(clientEndpoint, clientId, awsAccessKeyId, awsSecretAccessKey,
                        sessionToken);
            }
        }

        if (awsIotClient == null) {
            throw new IllegalArgumentException("Failed to construct client due to missing certificate or credentials.");
        }
    }

    public static void main(String args[]) throws InterruptedException, AWSIotException {
        CommandArguments arguments = CommandArguments.parse(args);
        initClient(arguments);

        awsIotClient.setWillMessage(new AWSIotMessage("client/disconnect", AWSIotQos.QOS0, awsIotClient.getClientId()));

        String thingName = arguments.getNotNull("thingName", SampleUtil.getConfig("thingName"));
        ConnectedWindow connectedWindow = new ConnectedWindow(thingName);

        awsIotClient.attach(connectedWindow);
        awsIotClient.connect();

        // Delete existing document if any
        connectedWindow.delete();

        AWSIotConnectionStatus status = AWSIotConnectionStatus.DISCONNECTED;
        while (true) {
            AWSIotConnectionStatus newStatus = awsIotClient.getConnectionStatus();
            if (!status.equals(newStatus)) {
                System.out.println(System.currentTimeMillis() + " Connection status changed to " + newStatus);
                status = newStatus;
            }

            Thread.sleep(1000);
        }
    }

}