/*
 *
 *  * Copyright 2016 Open Networking Laboratory
 *  *
 *  * Licensed 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.onosproject.driver.rest;

import com.google.common.collect.Lists;
import org.apache.commons.configuration.HierarchicalConfiguration;
import org.onosproject.driver.XmlConfigParser;
import org.onosproject.net.AnnotationKeys;
import org.onosproject.net.CltSignalType;
import org.onosproject.net.DefaultAnnotations;
import org.onosproject.net.DeviceId;
import org.onosproject.net.PortNumber;
import org.onosproject.net.SparseAnnotations;
import org.onosproject.net.behaviour.PortDiscovery;
import org.onosproject.net.device.OduCltPortDescription;
import org.onosproject.net.device.PortDescription;
import org.onosproject.net.driver.AbstractHandlerBehaviour;
import org.onosproject.net.driver.DriverHandler;
import org.onosproject.protocol.rest.RestSBController;

import java.util.ArrayList;
import java.util.List;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Discovers the ports from a Ciena WaveServer Rest device.
 */
public class PortDiscoveryCienaWaveserverImpl extends AbstractHandlerBehaviour
        implements PortDiscovery {

    private static final String SPEED = "speed";
    private static final String GBPS = "Gbps";
    private static final String PORT_ID = "port-id";
    private static final String XML = "xml";
    private static final String ENABLED = "enabled";
    private static final String EMPTY_STRING = "";
    private static final String NAME = "name";
    private static final String ADMIN_STATE = "admin-state";

    private static final ArrayList<String> LINESIDE = Lists.newArrayList(
            "1.1", "1.2", "12.1", "12.2");

    private static final String GENERAL_PORT_REQUEST =
            "yang-api/datastore/ws-ports?config=true&format=xml&depth=unbounded";
    private static final String SPECIFIC_PORT_PATH = "yang-api/datastore/ws-ptps/ptp/";
    private static final String SPECIFIC_PORT_CONFIG =
            "/ptp-config?config=true&format=xml&depth=unbounded";


    @Override
    public List<PortDescription> getPorts() {
        List<PortDescription> ports = Lists.newArrayList();
        DriverHandler handler = handler();
        RestSBController controller = checkNotNull(handler.get(RestSBController.class));
        DeviceId deviceId = handler.data().deviceId();


        HierarchicalConfiguration config = XmlConfigParser.
                loadXml(controller.get(deviceId, GENERAL_PORT_REQUEST, XML));
        List<HierarchicalConfiguration> portsConfig =
                XmlConfigParser.parseWaveServerCienaPorts(config);

        portsConfig.stream().forEach(sub -> {
            String name = sub.getString(NAME);
            SparseAnnotations annotations = DefaultAnnotations.builder()
                    .set(AnnotationKeys.NAME, String.valueOf(name)).build();
            if (LINESIDE.contains(name)) {
                String wsportInfoRequest = SPECIFIC_PORT_PATH + sub.getLong(PORT_ID) +
                        SPECIFIC_PORT_CONFIG;
                ports.add(XmlConfigParser.parseWaveServerCienaOCHPorts(
                        sub.getLong(PORT_ID),
                        toGbps(Long.parseLong(sub.getString(SPEED).replace(GBPS, EMPTY_STRING))),
                        XmlConfigParser.loadXml(controller.get(deviceId, wsportInfoRequest, XML)),
                        annotations));
            } else {
                //FIXME change when all optical types have two way information methods, see jira tickets
                final int speed100GbpsinMbps = 100000;
                CltSignalType cltType = toGbps(Long.parseLong(
                        sub.getString(SPEED).replace(GBPS, EMPTY_STRING))) == speed100GbpsinMbps ?
                        CltSignalType.CLT_100GBE : null;
                ports.add(new OduCltPortDescription(PortNumber.portNumber(sub.getLong(PORT_ID)),
                                                    sub.getString(ADMIN_STATE).equals(ENABLED),
                                                    cltType, annotations));
            }
        });
        return ports;
    }

    //FIXME remove when all optical types have two way information methods, see jira tickets
    private long toGbps(long speed) {
        return speed * 1000;
    }
}