/**
 * This file Copyright (c) 2014 Magnolia International
 * Ltd.  (http://www.magnolia-cms.com). All rights reserved.
 *
 *
 * This file is dual-licensed under both the Magnolia
 * Network Agreement and the GNU General Public License.
 * You may elect to use one or the other of these licenses.
 *
 * This file is distributed in the hope that it will be
 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
 * implied warranty of MERCHANTABILITY or FITNESS FOR A
 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
 * Redistribution, except as permitted by whichever of the GPL
 * or MNA you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or
 * modify this file under the terms of the GNU General
 * Public License, Version 3, as published by the Free Software
 * Foundation.  You should have received a copy of the GNU
 * General Public License, Version 3 along with this program;
 * if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * 2. For the Magnolia Network Agreement (MNA), this file
 * and the accompanying materials are made available under the
 * terms of the MNA which accompanies this distribution, and
 * is available at http://www.magnolia-cms.com/mna.html
 *
 * Any modifications to this file must keep this entire header
 * intact.
 *
 */
package info.magnolia.dam.core.util;

import com.google.common.net.MediaType;
import info.magnolia.dam.api.Asset;
import info.magnolia.dam.api.AssetRenderer;
import info.magnolia.dam.api.AssetRendition;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * An {@link AssetRenderer} which does nothing to the Asset (i.e returns an {@link AssetRendition} which just delegates
 * to the original asset, but can configured to support only certain mimetypes.
 * It can thus be configured to "bypass" other renderers for certain types.
 */
public class NoOpAssetRenderer implements AssetRenderer {
    private List<MediaType> mediaTypes = new ArrayList<MediaType>();
    private List<MediaType> outputMediaTypes = new ArrayList<MediaType>();

    @Override
    public boolean supports(MediaType from, MediaType to) {
        return mediaTypes.contains(from) || outputMediaTypes.contains(to);
    }

    @Override
    public boolean canRender(Asset asset, MediaType to) {
        return supports(MediaType.parse(asset.getMimeType()), to);
    }

    @Override
    public AssetRendition render(Asset asset, MediaType to, String renditionName) {
        return new NoOpAssetRendition(asset);
    }


    // ----- Configuration methods ------
    public List<MediaType> getMediaTypes() {
        return mediaTypes;
    }

    public void setMediaTypes(List<MediaType> mediaTypes) {
        this.mediaTypes = mediaTypes;
    }

    public List<MediaType> getOutputMediaTypes() {
        return outputMediaTypes;
    }

    public void setOutputMediaTypes(List<MediaType> outputMediaTypes) {
        this.outputMediaTypes = outputMediaTypes;
    }

    private static class NoOpAssetRendition implements AssetRendition {
        private final Asset asset;

        public NoOpAssetRendition(Asset asset) {
            this.asset = asset;
        }

        @Override
        public String getLink() {
            return asset.getLink();
        }

        @Override
        public String getRenditionName() {
            return "no-op";
        }

        @Override
        public String getMimeType() {
            return asset.getMimeType();
        }

        @Override
        public InputStream getStream() {
            return asset.getContentStream();
        }

        @Override
        public Asset getAsset() {
            return asset;
        }
    }
}