/*
 * Copyright 2016-present Open Networking Foundation
 *
 * 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.cli.net;

import com.google.common.collect.Collections2;
import org.apache.karaf.shell.commands.Argument;
import org.apache.karaf.shell.commands.Command;
import org.onosproject.cli.AbstractShellCommand;
import org.onosproject.net.DeviceId;
import org.onosproject.net.meter.Meter;
import org.onosproject.net.meter.MeterId;
import org.onosproject.net.meter.MeterService;

import java.util.Collection;

import static com.google.common.base.Strings.isNullOrEmpty;

/**
 * Lists all meters.
 */
@Command(scope = "onos", name = "meters",
        description = "Shows meters")
public class MetersListCommand extends AbstractShellCommand {

    @Argument(index = 0, name = "uri", description = "Device ID",
            required = false, multiValued = false)
    String uri = null;

    @Argument(index = 1, name = "meter", description = "Meter ID",
            required = false, multiValued = false)
    String meterstr = null;

    MeterId meterId = null;

    @Override
    protected void execute() {

        if (!isNullOrEmpty(meterstr)) {
            meterId = MeterId.meterId(Long.parseLong(meterstr));
        }

        MeterService service = get(MeterService.class);

        if (meterId != null && uri != null) {
            Meter m = service.getMeter(DeviceId.deviceId(uri), meterId);
            if (m != null) {
                print("%s", m);
            } else {
                error("Meter %s not found for device %s", meterId, uri);
            }
        } else {
            Collection<Meter> meters = service.getAllMeters();
            if (uri == null) {
                printMeters(meters);
            } else {
                printMeters(Collections2.filter(meters,
                        m -> m.deviceId().equals(DeviceId.deviceId(uri))));
            }
        }
    }

    private void printMeters(Collection<Meter> meters) {
        meters.forEach(m -> print(" %s", m));
    }
}