/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License 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 org.apache.streampipes.connect.adapters.netio;

import com.google.gson.Gson;
import org.apache.http.HttpHost;
import org.apache.http.client.HttpResponseException;
import org.apache.http.client.fluent.Executor;
import org.apache.http.client.fluent.Request;
import org.apache.streampipes.connect.adapter.Adapter;
import org.apache.streampipes.connect.adapter.sdk.ParameterExtractor;
import org.apache.streampipes.connect.adapter.util.PollingSettings;
import org.apache.streampipes.connect.adapters.PullAdapter;
import org.apache.streampipes.connect.adapters.netio.model.NetioAllPowerOutputs;
import org.apache.streampipes.connect.adapters.netio.model.NetioPowerOutput;
import org.apache.streampipes.connect.api.exception.AdapterException;
import org.apache.streampipes.model.AdapterType;
import org.apache.streampipes.model.connect.adapter.SpecificAdapterStreamDescription;
import org.apache.streampipes.model.connect.guess.GuessSchema;
import org.apache.streampipes.sdk.StaticProperties;
import org.apache.streampipes.sdk.builder.adapter.SpecificDataStreamAdapterBuilder;
import org.apache.streampipes.sdk.helpers.Labels;
import org.apache.streampipes.sdk.helpers.Locales;
import org.apache.streampipes.sdk.utils.Assets;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;

public class NetioRestAdapter extends PullAdapter {

    /**
     * A unique id to identify the adapter type
     */
    public static final String ID = "org.apache.streampipes.connect.iiot.adapters.netio.rest";

    /**
     * Keys of user configuration parameters
     */
    private static final String NETIO_IP = "NETIO_IP";
    private static final String NETIO_USERNAME = "NETIO_USERNAME";
    private static final String NETIO_PASSWORD = "NETIO_PASSWORD";
    private static final String NETIO_POLLING_INTERVAL = "NETIO_POLLING_INTERVAL";

    /**
     * Values of user configuration parameters
     */
    private String ip;
    private String username;
    private String passowrd;
    private int pollingInterval;

    /**
     * Empty constructor and a constructor with SpecificAdapterStreamDescription are mandatory
     */
    public NetioRestAdapter() {
    }

    public NetioRestAdapter(SpecificAdapterStreamDescription adapterDescription) {
        super(adapterDescription);
    }


    /**
     * Describe the adapter adapter and define what user inputs are required. Currently users can just select one node, this will be extended in the future
     * @return
     */
    @Override
    public SpecificAdapterStreamDescription declareModel() {

        SpecificAdapterStreamDescription description = SpecificDataStreamAdapterBuilder.create(ID)
                .withLocales(Locales.EN)
                .withAssets(Assets.DOCUMENTATION, Assets.ICON)
                .category(AdapterType.Energy)
                .requiredTextParameter(Labels.withId(NETIO_IP))
                .requiredIntegerParameter(Labels.withId(NETIO_POLLING_INTERVAL), 2)
                .requiredTextParameter(Labels.withId(NETIO_USERNAME))
                .requiredStaticProperty(StaticProperties.secretValue(Labels.withId(NETIO_PASSWORD)))
                .build();
        description.setAppId(ID);


        return description;
    }

    /**
     * Takes the user input and creates the event schema. The event schema describes the properties of the event stream.
     * @param adapterDescription
     * @return
     * @throws AdapterException
     */
    @Override
    public GuessSchema getSchema(SpecificAdapterStreamDescription adapterDescription) throws AdapterException {
        getConfigurations(adapterDescription);

        try {
            requestData();

            return NetioUtils.getNetioSchema();
        } catch (IOException e) {
            if (e instanceof HttpResponseException && ((HttpResponseException) e).getStatusCode() == 401) {
                throw new AdapterException("Unauthorized! Could not connect to NETIO sensor: " + this.ip + " with username " + this.username);
            } else {
                throw new AdapterException("Could not connect to NETIO sensor: " + this.ip + " with username " + this.username);
            }
        }

    }

    /**
     * This method is executed when the adapter is started. A connection to the PLC is initialized
     * @throws AdapterException
     */
    @Override
    protected void before() throws AdapterException {
        // Extract user input
        getConfigurations(adapterDescription);

    }

    /**
     * pullData is called iteratively according to the polling interval defined in getPollInterval.
     */
    @Override
    protected void pullData() {
        try {
            NetioAllPowerOutputs allPowerOutputs = requestData();

            for (NetioPowerOutput output : allPowerOutputs.getPowerOutputs()) {
                Map<String, Object> event = NetioUtils.getEvent(allPowerOutputs.getGobalMeasure(), output);
                this.adapterPipeline.process(event);
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private NetioAllPowerOutputs requestData() throws IOException {
        Executor executor = Executor.newInstance()
                .auth(new HttpHost(this.ip, 80), this.username, this.passowrd);

        String response = executor.execute(Request.Get("http://" + this.ip + "/netio.json"))
                .returnContent().asString();

        NetioAllPowerOutputs allPowerOutputs = new Gson().fromJson(response, NetioAllPowerOutputs.class);

        return allPowerOutputs;
    }

    /**
     * Define the polling interval of this adapter. Default is to poll every second
     * @return
     */
    @Override
    protected PollingSettings getPollingInterval() {
        return PollingSettings.from(TimeUnit.SECONDS, this.pollingInterval);
    }

    /**
     * Required by StreamPipes return a new adapter instance by calling the constructor with SpecificAdapterStreamDescription
     * @param adapterDescription
     * @return
     */
    @Override
    public Adapter getInstance(SpecificAdapterStreamDescription adapterDescription) {
        return new NetioRestAdapter(adapterDescription);
    }


    /**
     * Required by StreamPipes. Return the id of the adapter
     * @return
     */
    @Override
    public String getId() {
        return ID;
    }

    /**
     * Extracts the user configuration from the SpecificAdapterStreamDescription and sets the local variales
     * @param adapterDescription
     */
    private void getConfigurations(SpecificAdapterStreamDescription adapterDescription) {
        ParameterExtractor extractor = new ParameterExtractor(adapterDescription.getConfig());

        this.ip = extractor.singleValue(NETIO_IP, String.class);
        this.username = extractor.singleValue(NETIO_USERNAME, String.class);
        this.passowrd = extractor.secretValue(NETIO_PASSWORD);
        this.pollingInterval = extractor.singleValue(NETIO_POLLING_INTERVAL, Integer.class);
    }

}
