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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2014 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package org.glassfish.admin.rest.provider;

import com.sun.enterprise.util.StringUtils;
import java.io.IOException;
import java.io.OutputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.Provider;
import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import org.glassfish.api.admin.progress.ProgressStatusEvent;
import org.glassfish.api.admin.progress.ProgressStatusEventComplete;
import org.glassfish.api.admin.progress.ProgressStatusEventCreateChild;
import org.glassfish.api.admin.progress.ProgressStatusEventProgress;
import org.glassfish.api.admin.progress.ProgressStatusEventSet;

/**
 *
 * @author mmares
 */
@Provider
@Produces({MediaType.APPLICATION_JSON, "application/x-javascript"})
public class ProgressStatusEventJsonProvider extends BaseProvider {

    private static final JsonFactory factory = new JsonFactory();

    public ProgressStatusEventJsonProvider() {
        super(ProgressStatusEvent.class, MediaType.APPLICATION_JSON_TYPE, new MediaType("application", "x-javascript"));
    }

    @Override
    protected boolean isGivenTypeWritable(Class type, Type genericType) {
        return desiredType.isAssignableFrom(type);
    }

    @Override
    public void writeTo(ProgressStatusEvent proxy, Class type, Type genericType, Annotation[] annotations, MediaType mediaType,
            MultivaluedMap httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {
        JsonGenerator out = factory.createJsonGenerator(entityStream, JsonEncoding.UTF8);
        out.writeStartObject();
        writePSEvent(proxy, out);
        out.writeEndObject();
        out.flush();
    }

    private void writePSEvent(ProgressStatusEvent event, JsonGenerator out) throws IOException {
        if (event == null) {
            return;
        }
        out.writeObjectFieldStart("progress-status-event");
        out.writeStringField("id", event.getSourceId());
        if (event instanceof ProgressStatusEventProgress) {
            writePSEventProgress((ProgressStatusEventProgress) event, out);
        } else if (event instanceof ProgressStatusEventSet) {
            writePSEventSet((ProgressStatusEventSet) event, out);
        } else if (event instanceof ProgressStatusEventComplete) {
            writePSEventComplete((ProgressStatusEventComplete) event, out);
        } else if (event instanceof ProgressStatusEventCreateChild) {
            writePSEventCreateChild((ProgressStatusEventCreateChild) event, out);
        } else
        out.writeEndObject();
    }

    private void writePSEventSet(ProgressStatusEventSet event, JsonGenerator out) throws IOException {
        out.writeObjectFieldStart("set");
        if (event.getTotalStepCount() != null) {
            out.writeNumberField("total-step-count", event.getTotalStepCount());
        }
        if (event.getCurrentStepCount() != null) {
            out.writeNumberField("current-step-count", event.getCurrentStepCount());
        }
        out.writeEndObject();
    }

    private void writePSEventProgress(ProgressStatusEventProgress event, JsonGenerator out) throws IOException {
        out.writeObjectFieldStart("progres");
        out.writeNumberField("steps", event.getSteps());
        if (StringUtils.ok(event.getMessage())) {
            out.writeStringField("message", event.getMessage());
        }
        if (event.isSpinner()) {
            out.writeBooleanField("spinner", event.isSpinner());
        }
        out.writeEndObject();
    }

    private void writePSEventComplete(ProgressStatusEventComplete event, JsonGenerator out) throws IOException {
        out.writeObjectFieldStart("complete");
        if (StringUtils.ok(event.getMessage())) {
            out.writeStringField("message", event.getMessage());
        }
        out.writeEndObject();
    }

    private void writePSEventCreateChild(ProgressStatusEventCreateChild event, JsonGenerator out) throws IOException {
        out.writeObjectFieldStart("create-child");
        out.writeStringField("id", event.getChildId());
        out.writeNumberField("allocated-steps", event.getAllocatedSteps());
        out.writeNumberField("total-step-count", event.getTotalSteps());
        if (StringUtils.ok(event.getName())) {
            out.writeStringField("name", event.getName());
        }
        out.writeEndObject();
    }

    @Override
    public String getContent(ProgressStatusEvent proxy) {
        throw new UnsupportedOperationException("Not supported yet.");
    }

}