/*
 * Copyright (c) 2016 Ericsson India Global Services Pvt Ltd. 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.vpnservice.elan.cli;

import org.apache.karaf.shell.commands.Argument;
import org.apache.karaf.shell.commands.Command;
import org.apache.karaf.shell.console.OsgiCommandSupport;
import org.opendaylight.elanmanager.api.IElanService;
import org.opendaylight.vpnservice.elan.utils.ElanCLIUtils;
import org.opendaylight.vpnservice.interfacemgr.globals.InterfaceInfo;
import org.opendaylight.vpnservice.interfacemgr.interfaces.IInterfaceManager;
import org.opendaylight.yang.gen.v1.urn.opendaylight.vpnservice.elan.rev150602.elan.instances.ElanInstance;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.List;

@Command(scope = "elanInterface", name = "show", description = "display Elan Interfaces for the ElanInstance")
public class ElanInterfaceGet extends OsgiCommandSupport {

    private static final Logger logger = LoggerFactory.getLogger(ElanInterfaceGet.class);

    @Argument(index = 0, name = "elanName", description = "ELAN-NAME", required = false, multiValued = false)
    private String elanName;
    private IInterfaceManager interfaceManager;
    public static int MAX_LENGTH = 31;
    private IElanService elanProvider;
    public static boolean isDisplay = true;

    public void setElanProvider(IElanService elanServiceProvider) {
        this.elanProvider = elanServiceProvider;
    }

    public void setInterfaceManager(IInterfaceManager interfaceManager) {
        this.interfaceManager = interfaceManager;
    }

    @Override
    protected Object doExecute() {
        try {
            logger.debug("Executing Get ElanInterface command for the corresponding Elan Instance" + "\t" + elanName +  "\t");
            if(elanName != null) {
                ElanInstance elanInstance = elanProvider.getElanInstance(elanName);
                List<String> elanInterfaces = elanProvider.getElanInterfaces(elanName);
                if (elanInterfaces == null) {
                    System.out.println("No Elan Interfaces present for ELan Instance:" + elanName);
                    return null;
                }
                System.out.println(getElanInterfaceHeaderOutput());
                displayInterfaces(elanInstance, elanInterfaces);

            } else {
                List<ElanInstance> elanInstances = elanProvider.getElanInstances();
                if(!elanInstances.isEmpty()) {
                    System.out.println(getElanInterfaceHeaderOutput());
                    for(ElanInstance elanInstance : elanInstances) {
                        List<String> elanInterfaces = elanProvider.getElanInterfaces(elanInstance.getElanInstanceName());
                        displayInterfaces(elanInstance, elanInterfaces);
                        System.out.println("\n");
                    }
                }

            }
        } catch (Exception e) {
            logger.error("Elan Instance failed to get {}", e);
            e.printStackTrace();
        }
        return null;
    }

    private Object getElanInterfaceHeaderOutput() {
        StringBuilder headerBuilder = new StringBuilder();
        headerBuilder.append(String.format(ElanCLIUtils.ELAN_INTERFACE_CLI_FORMAT, "ElanInstance/Tag", "ElanInterface/Tag", "OpState" , "AdminState"));
        headerBuilder.append('\n');
        headerBuilder.append(ElanCLIUtils.HEADER_UNDERLINE);
        return headerBuilder.toString();
    }

    private void displayInterfaces(ElanInstance elanInstance, List<String> interfaceList) {
        if(!interfaceList.isEmpty()) {
            for (String elanInterface : interfaceList)
            {
                InterfaceInfo interfaceInfo = interfaceManager.getInterfaceInfo(elanInterface);
                if (interfaceInfo != null) {
                    System.out.println(String.format(ElanCLIUtils.ELAN_INTERFACE_CLI_FORMAT, elanInstance.getElanInstanceName()+"/"+elanInstance.getElanTag(), elanInterface+"/"+interfaceInfo.getInterfaceTag(), interfaceInfo.getOpState(), interfaceInfo.getAdminState()));
                }
            }
        }
    }
}