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/*
 * Copyright 2015-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.net.meter;

import com.google.common.collect.ImmutableSet;
import org.onosproject.core.ApplicationId;
import org.onosproject.net.AbstractAnnotated;
import org.onosproject.net.Annotations;
import org.onosproject.net.DeviceId;

import java.util.Collection;
import java.util.Optional;

import static com.google.common.base.MoreObjects.toStringHelper;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;

/**
 * A default implementation of a meter.
 */
public final class DefaultMeterRequest extends AbstractAnnotated implements MeterRequest {

    private final ApplicationId appId;
    private final Meter.Unit unit;
    private final boolean burst;
    private final Collection bands;
    private final DeviceId deviceId;
    private final Optional context;
    private final Type op;
    private final MeterScope scope;
    private final Optional index;

    private DefaultMeterRequest(DeviceId deviceId, ApplicationId appId,
                                Meter.Unit unit, boolean burst,
                                Collection bands, MeterContext context,
                                Type op, MeterScope scope, Optional index,
                                Annotations... annotations) {
        super(annotations);
        this.deviceId = deviceId;
        this.appId = appId;
        this.unit = unit;
        this.burst = burst;
        this.bands = bands;
        this.context = Optional.ofNullable(context);
        this.op = op;
        this.scope = scope;
        this.index = index;
    }

    @Override
    public DeviceId deviceId() {
        return deviceId;
    }


    @Override
    public ApplicationId appId() {
        return appId;
    }

    @Override
    public Meter.Unit unit() {
        return unit;
    }

    @Override
    public boolean isBurst() {
        return burst;
    }

    @Override
    public Collection bands() {
        return bands;
    }

    @Override
    public Optional context() {
        return context;
    }

    @Override
    public MeterScope scope() {
        return scope;
    }

    @Override
    public Optional index() {
        return index;
    }

    public static Builder builder() {
        return new Builder();
    }

    @Override
    public String toString() {
        return toStringHelper(this)
                .add("device", deviceId)
                .add("appId", appId.name())
                .add("unit", unit)
                .add("isBurst", burst)
                .add("bands", bands)
                .add("scope", scope)
                .add("desired index", index.orElse(null))
                .add("annotations", annotations())
                .toString();
    }

    public static final class Builder implements MeterRequest.Builder {
        // Relevant only for delete
        private static final Band DUMMY_BAND = new DefaultBand(Band.Type.DROP, 0L, 0L, (short) 0);

        private ApplicationId appId;
        private Meter.Unit unit = Meter.Unit.KB_PER_SEC;
        private boolean burst = false;
        private Collection bands;
        private DeviceId deviceId;
        private MeterContext context;
        private Annotations annotations;
        private MeterScope scope = MeterScope.globalScope();
        private Optional desiredIndex = Optional.empty();

        @Override
        public MeterRequest.Builder forDevice(DeviceId deviceId) {
            this.deviceId = deviceId;
            return this;
        }

        @Override
        public MeterRequest.Builder fromApp(ApplicationId appId) {
            this.appId = appId;
            return this;
        }

        @Override
        public MeterRequest.Builder withUnit(Meter.Unit unit) {
            this.unit = unit;
            return this;
        }

        @Override
        public MeterRequest.Builder burst() {
            this.burst = true;
            return this;
        }

        @Override
        public MeterRequest.Builder withBands(Collection bands) {
            this.bands = ImmutableSet.copyOf(bands);
            return this;
        }

        @Override
        public MeterRequest.Builder withContext(MeterContext context) {
            this.context = context;
            return this;
        }

        @Override
        public MeterRequest.Builder withAnnotations(Annotations annotations) {
            this.annotations = annotations;
            return this;
        }

        @Override
        public MeterRequest.Builder withScope(MeterScope scope) {
            this.scope = scope;
            return this;
        }

        @Override
        public MeterRequest.Builder withIndex(Long index) {
            this.desiredIndex = Optional.ofNullable(index);
            return this;
        }

        @Override
        public MeterRequest add() {
            validate();
            return new DefaultMeterRequest(deviceId, appId, unit, burst, bands, context,
                                           Type.ADD, scope, desiredIndex, annotations);
        }

        @Override
        public MeterRequest remove() {
            // Allow to create the removal request without specifying bands
            if (bands == null || bands.isEmpty()) {
                bands = ImmutableSet.of(DUMMY_BAND);
            }

            validate();
            return new DefaultMeterRequest(deviceId, appId, unit, burst, bands, context,
                                           Type.REMOVE, scope, desiredIndex, annotations);
        }

        private void validate() {
            checkNotNull(deviceId, "Must specify a device");
            checkNotNull(bands, "Must have bands.");
            checkArgument(!bands.isEmpty(), "Must have at least one band.");
            checkNotNull(appId, "Must have an application id");
            if (desiredIndex.isPresent()) {
                checkArgument(desiredIndex.get() >= 0, "Desired index cannot be negative");
            }
        }


    }
}