/*
 * Copyright 2017-present Open Networking Laboratory
 *
 * 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.pi.model;

import com.google.common.annotations.Beta;
import org.onosproject.net.driver.Behaviour;

import java.io.InputStream;
import java.util.Collection;
import java.util.Optional;

/**
 * Configuration of a protocol-independent pipeline that includes a pipeline model, a collection of
 * pipeline-specific behaviours implementation, and extensions.
 */
@Beta
public interface PiPipeconf {

    /**
     * Returns the identifier of this pipeline configuration.
     *
     * @return a identifier
     */
    PiPipeconfId id();

    /**
     * Returns the pipeline model.
     *
     * @return a pipeline model
     */
    PiPipelineModel pipelineModel();

    /**
     * Returns all pipeline-specific behaviour interfaces defined by this configuration.
     *
     * @return a collection of behaviours
     */
    Collection<Class<? extends Behaviour>> behaviours();

    /**
     * Returns the implementation class for the given behaviour, if present.
     *
     * @param behaviour behaviour interface
     * @return implementation class
     */
    Optional<Class<? extends Behaviour>> implementation(Class<? extends Behaviour> behaviour);

    /**
     * Indicates whether or not the pipeconf supports the specified class of behaviour.
     *
     * @param behaviourClass behaviour class
     * @return true if behaviour is supported
     */
    boolean hasBehaviour(Class<? extends Behaviour> behaviourClass);

    /**
     * Returns, if present, an input stream of ad device-specific or control
     * protocol-specific extension of this configuration. For example, if requesting a
     * target-specific P4 binary, this will return the same bytes produced by the P4 compiler.
     *
     * @param type extension type
     * @return extension input stream
     */
    // FIXME: this is a sloppy way of handling extensions.
    Optional<InputStream> extension(ExtensionType type);

    /**
     * Type of extension of a protocol-independent pipeline configuration.
     */
    enum ExtensionType {
        /**
         * The P4Info as returned by the p4c compiler in text format.
         */
        P4_INFO_TEXT,

        /**
         * BMv2 JSON configuration.
         */
        BMV2_JSON,

        /**
         * Barefoot's Tofino configuration binary.
         */
        TOFINO_BIN
    }
}