/*
 * Copyright 2018-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.
 *
 * This work was partially supported by EC H2020 project METRO-HAUL (761727).
 */
package org.onosproject.drivers.odtn.tapi;

import org.onosproject.net.ChannelSpacing;

/**
 * Tapi 2.1 OLS device related helpers.
 */
public final class TapiDeviceHelper {

    public static final String SERVICE_INTERFACE_POINT = "service-interface-point";
    public static final String UUID = "uuid";
    public static final String MEDIA_CHANNEL_SERVICE_INTERFACE_POINT_SPEC =
            "media-channel-service-interface-point-spec";
    public static final String MC_POOL = "mc-pool";
    public static final String LAYER_PROTOCOL_NAME = "layer-protocol-name";
    public static final String PHOTONIC_MEDIA = "PHOTONIC_MEDIA";
    public static final String SUPPORTED_LAYER_PROTOCOL_QUALIFIER = "supported-layer-protocol-qualifier";
    public static final String PHOTONIC_LAYER_QUALIFIER_NMC = "PHOTONIC_LAYER_QUALIFIER_NMC";
    public static final String FREQUENCY_CONSTRAINT = "frequency-constraint";
    public static final String GRID_TYPE = "grid-type";
    public static final String ADJUSTMENT_GRANULARITY = "adjustment-granularity";
    public static final String UPPER_FREQUENCY = "upper-frequency";
    public static final String LOWER_FREQUENCY = "lower-frequency";
    public static final String AVAILABLE_SPECTRUM = "available-spectrum";
    public static final long BASE_FREQUENCY = 193100000;   //Working in Mhz

    private TapiDeviceHelper(){}

    /**
     * Returns the slot granularity corresponding to a channelSpacing.
     *
     * @param chSpacing      OchSingal channel spacing {@link ChannelSpacing}
     * @return OchSignal slot width granularity
     */
    public static int getSlotGranularity(ChannelSpacing chSpacing) {
        if (chSpacing.equals(ChannelSpacing.CHL_100GHZ)) {
            return 8;
        } else if (chSpacing.equals(ChannelSpacing.CHL_50GHZ)) {
            return 4;
        } else if (chSpacing.equals(ChannelSpacing.CHL_25GHZ)) {
            return 2;
        } else if (chSpacing.equals(ChannelSpacing.CHL_12P5GHZ)) {
            return 1;
        } else {
            return 0;
        }
    }

    /**
     * Returns the ChannelSpacing corresponding to an adjustmentGranularity.
     *
     * @param adjustmentGranularity {@link String}
     * @return OchSingnal ChannelSpacing {@link ChannelSpacing}
     */
    public static ChannelSpacing getChannelSpacing(String adjustmentGranularity) {
        switch (adjustmentGranularity) {
            case "G_100GHZ ":
                return ChannelSpacing.CHL_100GHZ;
            case "G_50GHZ":
                return ChannelSpacing.CHL_50GHZ;
            case "G_25GHZ":
                return ChannelSpacing.CHL_25GHZ;
            case "G_12_5GHZ ":
                return ChannelSpacing.CHL_12P5GHZ;
            case "G_6_25GHZ ":
                return ChannelSpacing.CHL_6P25GHZ;
            default:
                return ChannelSpacing.CHL_0GHZ;
        }
    }

    /**
     *  To Mbps conversion from Hz.
     *
     *  @param speed the speed in Hz
     *  @return the speed in Mbps
     */
    public static long toMbpsFromHz(long speed) {
        return speed / 1000000;
    }
}