/*
 * Copyright 2016-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.yangutils.translator.tojava.javamodel;

import java.io.IOException;

import org.onosproject.yangutils.datamodel.YangNotification;
import org.onosproject.yangutils.translator.exception.TranslatorException;
import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;

import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_CLASS;
import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_LISTENER_INTERFACE;
import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_INTERFACE_WITH_BUILDER;
import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfNode;

/**
 * Represents notification information extended to support java code generation.
 */
public class YangJavaNotification
        extends YangNotification
        implements JavaCodeGenerator, JavaCodeGeneratorInfo {

    /**
     * Contains information of the java file being generated.
     */
    private JavaFileInfo javaFileInfo;

    /**
     * File handle to maintain temporary java code fragments as per the code
     * snippet types.
     */
    private TempJavaCodeFragmentFiles tempFileHandle;

    /**
     * Creates an instance of java Notification.
     */
    public YangJavaNotification() {
        super();
        setJavaFileInfo(new JavaFileInfo());
        getJavaFileInfo().setGeneratedFileTypes(GENERATE_INTERFACE_WITH_BUILDER
                | GENERATE_EVENT_CLASS | GENERATE_EVENT_LISTENER_INTERFACE);
    }

    /**
     * Returns the generated java file information.
     *
     * @return generated java file information
     */
    @Override
    public JavaFileInfo getJavaFileInfo() {

        if (javaFileInfo == null) {
            throw new TranslatorException("Missing java info in java datamodel node");
        }
        return javaFileInfo;
    }

    /**
     * Sets the java file info object.
     *
     * @param javaInfo java file info object
     */
    @Override
    public void setJavaFileInfo(JavaFileInfo javaInfo) {
        javaFileInfo = javaInfo;
    }

    /**
     * Returns the temporary file handle.
     *
     * @return temporary file handle
     */
    @Override
    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
        return tempFileHandle;
    }

    /**
     * Sets temporary file handle.
     *
     * @param fileHandle temporary file handle
     */
    @Override
    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
        tempFileHandle = fileHandle;
    }

    /**
     * Prepare the information for java code generation corresponding to YANG
     * notification info.
     *
     * @param yangPlugin YANG plugin config
     * @throws IOException IO operation fail
     */
    @Override
    public void generateCodeEntry(YangPluginConfig yangPlugin)
            throws IOException {

        /*
         * As part of the notification support the following files needs to be generated.
         * 1) Subject of the notification(event), this is simple interface with builder class.
         * 2) Event class extending "AbstractEvent" and defining event type enum.
         * 3) Event listener interface extending "EventListener".
         *
         * The manager class needs to extend the ListenerRegistry.
         */
        generateCodeOfNode(this, yangPlugin);
    }

    /**
     * Creates a java file using the YANG notification info.
     *
     * @throws IOException input output operation fail
     */
    @Override
    public void generateCodeExit()
            throws IOException {
        /*
         * As part of the notification support the following files needs to be generated.
         * 1) Subject of the notification(event), this is simple interface with builder class.
         * 2) Event class extending "AbstractEvent" and defining event type enum.
         * 3) Event listener interface extending "EventListener".
         *
         * The manager class needs to extend the "ListenerRegistry".
         */
        getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_INTERFACE_WITH_BUILDER
                | GENERATE_EVENT_CLASS | GENERATE_EVENT_LISTENER_INTERFACE, this);

    }
}