/*
 * Copyright © 2019 AT&T and others.  All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 */
package org.opendaylight.transportpce.renderer.provisiondevice;

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ForkJoinTask;
import java.util.concurrent.atomic.AtomicBoolean;

import org.opendaylight.transportpce.common.crossconnect.CrossConnect;
import org.opendaylight.transportpce.common.device.DeviceTransactionManager;
import org.opendaylight.transportpce.common.openroadminterfaces.OpenRoadmInterfaceException;
import org.opendaylight.transportpce.common.openroadminterfaces.OpenRoadmInterfaces;
import org.opendaylight.transportpce.renderer.openroadminterface.OpenRoadmInterfaceFactory;
import org.opendaylight.yang.gen.v1.http.org.opendaylight.transportpce.renderer.device.rev200128.OtnServicePathInput;
import org.opendaylight.yang.gen.v1.http.org.opendaylight.transportpce.renderer.device.rev200128.OtnServicePathOutput;
import org.opendaylight.yang.gen.v1.http.org.opendaylight.transportpce.renderer.device.rev200128.OtnServicePathOutputBuilder;
import org.opendaylight.yang.gen.v1.http.org.openroadm.device.rev181019.interfaces.grp.Interface;
import org.opendaylight.yang.gen.v1.http.org.transportpce.common.types.rev200128.node.interfaces.NodeInterface;
import org.opendaylight.yang.gen.v1.http.org.transportpce.common.types.rev200128.node.interfaces.NodeInterfaceBuilder;
import org.opendaylight.yang.gen.v1.http.org.transportpce.common.types.rev200128.node.interfaces.NodeInterfaceKey;
import org.opendaylight.yang.gen.v1.http.org.transportpce.common.types.rev200128.otn.renderer.input.Nodes;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class OtnDeviceRendererServiceImpl implements OtnDeviceRendererService {
    private static final Logger LOG = LoggerFactory.getLogger(OtnDeviceRendererServiceImpl.class);
    private final OpenRoadmInterfaceFactory openRoadmInterfaceFactory;
    private final CrossConnect crossConnect;
    private final OpenRoadmInterfaces openRoadmInterfaces;
    private final DeviceTransactionManager deviceTransactionManager;


    public OtnDeviceRendererServiceImpl(OpenRoadmInterfaceFactory openRoadmInterfaceFactory, CrossConnect crossConnect,
                                        OpenRoadmInterfaces openRoadmInterfaces,
                                        DeviceTransactionManager deviceTransactionManager) {
        this.openRoadmInterfaceFactory = openRoadmInterfaceFactory;
        this.crossConnect = crossConnect;
        this.openRoadmInterfaces = openRoadmInterfaces;
        this.deviceTransactionManager = deviceTransactionManager;
    }

    @Override
    public OtnServicePathOutput setupOtnServicePath(OtnServicePathInput input) {
        LOG.info("Calling setup service path");
        boolean success = true;
        List<NodeInterface> nodeInterfaces = new ArrayList<>();
        List<String> results = new ArrayList<>();
        if (input.getServiceType().equals("Ethernet")) {
            try {
                LOG.info("Calling Node interfaces {} {} {} {} {} {} {}",
                        input.getServiceRate(),input.getEthernetEncoding(),
                        input.getServiceType(),input.getOperation(),input.getTribPortNumber(),
                        input.getTribSlot(),input.getNodes());
                nodeInterfaces = createInterface(input);
                LOG.info("Node interfaces created just fine ");
            }
            catch (OpenRoadmInterfaceException e) {
                //handle exception
                LOG.warn("Set up service path failed {}", e.toString());
                success = false;
            }

        }
        if (success) {
            LOG.info("Result is success");
            for (NodeInterface nodeInterface: nodeInterfaces) {
                results.add("Otn Service path was set up successfully for node :" + nodeInterface.getNodeId());
            }
            //TODO Add otn topology links
        }
        OtnServicePathOutputBuilder otnServicePathOutputBuilder = new OtnServicePathOutputBuilder()
                .setSuccess(success)
                .setNodeInterface(nodeInterfaces)
                .setResult(String.join("\n", results));
        return otnServicePathOutputBuilder.build();
    }

    @Override
    public OtnServicePathOutput deleteOtnServicePath(OtnServicePathInput input) {
        List<Nodes> nodes = input.getNodes();
        AtomicBoolean success = new AtomicBoolean(true);
        ConcurrentLinkedQueue<String> results = new ConcurrentLinkedQueue<>();
        ForkJoinPool forkJoinPool = new ForkJoinPool();
        ForkJoinTask forkJoinTask = forkJoinPool.submit(() -> nodes.parallelStream().forEach(node -> {
            List<String> interfacesToDelete = new LinkedList<>();
            String nodeId = node.getNodeId();
            LOG.info("Deleting service setup on node {}", nodeId);
            String srcTp = node.getClientTp();
            String destTp = node.getNetworkTp();
            if ((srcTp == null) || (destTp == null) || input.getServiceRate() == null) {
                LOG.error("Source ({}) or destination ({}) termination point is null.", srcTp, destTp);
                return;
            }
            // if the node is currently mounted then proceed.
            if (this.deviceTransactionManager.isDeviceMounted(nodeId)) {
                String connectionNumber = "";
                switch (input.getServiceRate()) {
                    case("10G"):
                        connectionNumber = srcTp + "-ODU2e-" + input.getServiceName() + "-x-" + destTp
                            + "-ODU2e-" + input.getServiceName();
                        break;
                    case("1G"):
                        connectionNumber = srcTp + "-ODU0-" + input.getServiceName() + "-x-" + destTp
                            + "-ODU2e-" + input.getServiceName();
                        break;
                    default:
                        LOG.error("service rate {} not managed yet", input.getServiceRate());
                        String result = input.getServiceRate() + " is not supported";
                        results.add(result);
                        success.set(false);
                        return;
                }
                List<String> intToDelete = this.crossConnect.deleteCrossConnect(nodeId, connectionNumber, true);
                if (intToDelete != null) {
                    for (String interf : intToDelete) {
                        if (!this.openRoadmInterfaceFactory.isUsedbyOtnXc(nodeId, interf, connectionNumber,
                            this.deviceTransactionManager)) {
                            interfacesToDelete.add(interf);
                            if (!getSupportedInterface(nodeId, interf).contains("ODU4")) {
                                interfacesToDelete.add(getSupportedInterface(nodeId, interf));
                            }
                        }
                    }
                }
            } else {
                String result = nodeId + " is not mounted on the controller";
                results.add(result);
                success.set(false);
                LOG.warn(result);
                forkJoinPool.shutdown();
                return;
                //TODO should deletion end here?
            }
            for (String interfaceId : interfacesToDelete) {
                try {
                    this.openRoadmInterfaces.deleteInterface(nodeId, interfaceId);
                } catch (OpenRoadmInterfaceException e) {
                    String result = String.format("Failed to delete interface %s on node %s!", interfaceId, nodeId);
                    success.set(false);
                    LOG.error(result, e);
                    results.add(result);
                }
            }
        }));
        try {
            forkJoinTask.get();
        } catch (InterruptedException | ExecutionException e) {
            LOG.error("Error while deleting service paths!", e);
        }
        forkJoinPool.shutdown();
        OtnServicePathOutputBuilder delServBldr = new OtnServicePathOutputBuilder();
        delServBldr.setSuccess(success.get());
        if (results.isEmpty()) {
            return delServBldr.setResult("Request processed").build();
        } else {
            return delServBldr.setResult(String.join("\n", results)).build();
        }

    }

    private String getSupportedInterface(String nodeId, String interf) {
        Optional<Interface> supInterfOpt;
        try {
            supInterfOpt = this.openRoadmInterfaces.getInterface(nodeId, interf);
            if (supInterfOpt.isPresent()) {
                return supInterfOpt.get().getSupportingInterface();
            } else {
                return null;
            }
        } catch (OpenRoadmInterfaceException e) {
            LOG.error("error getting Supported Interface of {} - {}", interf, nodeId, e);
            return null;
        }
    }

    private List<NodeInterface> createInterface(OtnServicePathInput input) throws OpenRoadmInterfaceException {
        List<NodeInterface> nodeInterfaces = new ArrayList<>();
        LOG.info("Calling Create Interface entry for OTN service path");
        if (input.getServiceRate() == null
            || !("1G".equals(input.getServiceRate()) || "10G".equals(input.getServiceRate()))) {
            LOG.error("Service rate {} not managed yet", input.getServiceRate());
        } else {
            createLowOrderInterfaces(input, nodeInterfaces);
        }
        return nodeInterfaces;
    }

    private Optional<String> postCrossConnect(List<String> createdOduInterfaces, Nodes node)
            throws OpenRoadmInterfaceException {
        return this.crossConnect.postOtnCrossConnect(createdOduInterfaces,node);
    }

    private void createLowOrderInterfaces(OtnServicePathInput input, List<NodeInterface> nodeInterfaces)
        throws OpenRoadmInterfaceException {
        for (Nodes node: input.getNodes()) {
            //check if the node is mounted or not?
            List<String> createdEthInterfaces = new ArrayList<>();
            List<String> createdOduInterfaces = new ArrayList<>();
            switch (input.getServiceRate()) {
                case("1G"):
                    LOG.info("Input service is 1G");
                    createdEthInterfaces.add(
                        openRoadmInterfaceFactory.createOpenRoadmEth1GInterface(node.getNodeId(), node.getClientTp()));
                    createdOduInterfaces.add(
                        //suppporting interface?, payload ?
                        openRoadmInterfaceFactory.createOpenRoadmOdu0Interface(node.getNodeId(), node.getClientTp(),
                            input.getServiceName(), "07", false, input.getTribPortNumber(), input.getTribSlot()));
                    createdOduInterfaces.add(
                        openRoadmInterfaceFactory.createOpenRoadmOdu0Interface(node.getNodeId(), node.getNetworkTp(),
                            input.getServiceName(), "07", true, input.getTribPortNumber(), input.getTribSlot()));
                    break;
                case("10G"):
                    LOG.info("Input service is 10G");
                    createdEthInterfaces.add(
                        openRoadmInterfaceFactory.createOpenRoadmEth10GInterface(node.getNodeId(), node.getClientTp()));
                    createdOduInterfaces.add(
                        //suppporting interface?, payload ?
                        openRoadmInterfaceFactory.createOpenRoadmOdu2eInterface(node.getNodeId(), node.getClientTp(),
                            input.getServiceName(),"03", false ,input.getTribPortNumber(),input.getTribSlot()));
                    createdOduInterfaces.add(
                        // supporting interface? payload ?
                        openRoadmInterfaceFactory.createOpenRoadmOdu2eInterface(node.getNodeId(), node.getNetworkTp(),
                            input.getServiceName(),"03" , true ,input.getTribPortNumber(),input.getTribSlot()));
                    break;
                default:
                    LOG.error("service rate {} not managed yet", input.getServiceRate());
                    return;
            }

            //implement cross connect
            List<String> createdConnections = new ArrayList<>();
            if (!createdOduInterfaces.isEmpty()) {
                Optional<String> connectionNameOpt = postCrossConnect(createdOduInterfaces, node);
                createdConnections.add(connectionNameOpt.get());
                LOG.info("Created cross connects");
            }
            NodeInterfaceBuilder nodeInterfaceBuilder = new NodeInterfaceBuilder()
                    .withKey(new NodeInterfaceKey(input.getServiceName() + "-" + node.getNodeId()))
                    .setNodeId(input.getServiceName() + "-" + node.getNodeId())
                    .setConnectionId(createdConnections)
                    .setEthInterfaceId(createdEthInterfaces)
                    .setOduInterfaceId(createdOduInterfaces);
            nodeInterfaces.add(nodeInterfaceBuilder.build());
        }
    }
}