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to you under the Apache License, Version 2.0 (the
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  http://www.apache.org/licenses/LICENSE-2.0

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package org.apache.edgent.samples.connectors.iotp;

import java.io.File;
import java.io.FileReader;
import java.util.Arrays;
import java.util.List;
import java.util.Properties;
import java.util.Random;
import java.util.concurrent.TimeUnit;

import org.apache.edgent.connectors.iot.QoS;
import org.apache.edgent.connectors.iotp.IotpDevice;
import org.apache.edgent.providers.direct.DirectProvider;
import org.apache.edgent.topology.TStream;
import org.apache.edgent.topology.Topology;

import com.google.gson.JsonObject;
import com.ibm.iotf.client.device.DeviceClient;
import com.ibm.iotf.devicemgmt.DeviceData;
import com.ibm.iotf.devicemgmt.device.ManagedDevice;

/**
 * Send device events and subscribe to device commands as a registered IoT device
 * using a standard IBM Watson IoT Platform service instance.
 * <P>
 * Use {@link IotpAppClient} to print published events and generate a command
 * (start this app before running IotpAppClient). 
 * <P>
 * This sample demonstrates:
 * <UL>
 * <LI>Using the IotpDevice connector</LI>
 * <LI>Initializing the IotpDevice connector using the WIoTP API objects</LI>
 * <LI>Publishing and subscribing to device events and commands</LI>
 * </UL>
 * <p>
 * This connects to your IBM Watson IoT Platform service
 * as the Device defined in a device config file.
 * The file format is the standard one for IBM Watson IoT Platform.
 *
 * <p>See {@code scripts/connectors/iotp/README} for information about a
 * prototype device configuration file and running the sample.
 */
public class IotpDeviceSample {
    private static final String usage = "[useDeviceClient|useManagedDevice] [useHttp] <device-cfg-path>";

    public static void main(String[] args) throws Exception {
        if (args.length == 0)
          throw new Exception("Usage: " + usage);
        List<String> argList = Arrays.asList(args);
        boolean useDeviceClient = argList.contains("useDeviceClient");
        boolean useManagedDevice = argList.contains("useManagedDevice");
        boolean useInternalDeviceClient = !(useDeviceClient || useManagedDevice);
        boolean useHttp = argList.contains("useHttp");
        String deviceCfgPath = argList.get(argList.size() - 1);

        DirectProvider tp = new DirectProvider();
        Topology topology = tp.newTopology("IotpDeviceSample");
        
        Properties cfgProps = new Properties();
        cfgProps.load(new FileReader(new File(deviceCfgPath)));
        
        String iotpOrg = getProperty(cfgProps, "Organization-ID", "org");
        String iotpDevType = getProperty(cfgProps, "Device-Type", "type");
        String iotpDevId = getProperty(cfgProps, "Device-ID", "id");
        System.out.println("org:  " + iotpOrg);
        System.out.println("DeviceType: " + iotpDevType);
        System.out.println("DeviceId:   " + iotpDevId);
        
        // System.out.println("mosquitto_pub -u <api-auth-key> -P <api-quth-token> -h "+iotpOrg+".messaging.internetofthings.ibmcloud.com -p 1883 -i a:"+iotpOrg+":appId1 -t iot-2/type/"+iotpDevType+"/id/"+iotpDevId+"/cmd/cmd-1/fmt/json -m '{}'");
        // System.out.println("mosquitto_sub -d -u <api-auth-key> -P <api-quth-token> -h "+iotpOrg+".messaging.internetofthings.ibmcloud.com -p 1883 -i a:"+iotpOrg+":appId2 -t iot-2/type/+/id/+/evt/+/fmt/+");
        
        IotpDevice device;
        if (useInternalDeviceClient) {
          System.out.println("Using internal DeviceClient");
          device = new IotpDevice(topology, cfgProps);
        }
        else if (useDeviceClient) {
          System.out.println("Using WIoTP DeviceClient");
          device = new IotpDevice(topology, new DeviceClient(cfgProps));
        }
        else if (useManagedDevice) {
          System.out.println("Using WIoTP ManagedDevice");
          DeviceData deviceData = new DeviceData.Builder().build();
          device = new IotpDevice(topology, new ManagedDevice(cfgProps, deviceData));
        }
        else
          throw new Exception("woops");
             
        Random r = new Random();
        TStream<double[]> raw = topology.poll(() -> {
            double[]  v = new double[3];
            
            v[0] = r.nextGaussian() * 10.0 + 40.0;
            v[1] = r.nextGaussian() * 10.0 + 50.0;
            v[2] = r.nextGaussian() * 10.0 + 60.0;
            
            return v;
        }, 3, TimeUnit.SECONDS);
        
        TStream<JsonObject> json = raw.map(v -> {
            JsonObject j = new JsonObject();
            j.addProperty("temp", v[0]);
            j.addProperty("humidity", v[1]);
            j.addProperty("objectTemp", v[2]);
            return j;
        });
        
        if (!useHttp) {
          device.events(json, "sensors", QoS.FIRE_AND_FORGET);
        }
        else {
          System.out.println("Publishing events using HTTP");
          device.httpEvents(json, "sensors");
        }
        
        // subscribe to / report device cmds 
        device.commands().sink(jo -> System.out.println("Received cmd: " + jo));

        tp.submit(topology);
    }
    
    private static String getProperty(Properties props, String... keys) {
      for (String key : keys) {
        String val = props.getProperty(key);
        if (val != null)
          return val;
      }
      return null;
    }
}