package org.simantics.help.base.internal;

import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLDecoder;

import org.eclipse.core.runtime.FileLocator;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.Status;
import org.eclipse.help.search.IHelpSearchIndex;
import org.eclipse.help.search.ISearchDocument;
import org.eclipse.help.search.SearchParticipant;
import org.osgi.framework.Bundle;

/**
 * An abstract search participants for adding XML documents to the search index. Subclass it
 * and implement or override protected methods to handle parsing of the document.
 *
 * @since 1.20.0
 */
public class PDFSearchParticipant extends SearchParticipant {

    @Override
    public IStatus addDocument(IHelpSearchIndex index, String pluginId, String name, URL url, String id, ISearchDocument doc) {
        try {
            //System.out.println("PDFSearchParticipant.addDocument(" + index + ", " + pluginId + ", " + name + ", " + url + ", " + id + ", " + doc + ")");
            Bundle bundle = Platform.getBundle(pluginId);
            if (bundle == null)
                return new Status(IStatus.ERROR, pluginId, "Failed to find bundle " + bundle + " from the platform.");

            // Need to decode path because it will fail to resolve if it contains %20 (=' ').
            IPath path = new Path(URLDecoder.decode(name, "UTF-8"));
            path = path.removeFirstSegments(1);
            URL bundleUrl = FileLocator.find(bundle, path, null);
            if (bundleUrl == null)
                return new Status(IStatus.ERROR, pluginId, "Failed to find file " + name + " from bundle " + pluginId + ".");

            URL fileUrl = FileLocator.toFileURL(bundleUrl);
            if (!fileUrl.getProtocol().equals("file"))
                return new Status(IStatus.ERROR, pluginId, "Failed to make " + url + " available as a file");

            File f = new File(URLDecoder.decode(fileUrl.getPath(), "UTF-8")).getCanonicalFile();
            PDFUtil.stripText(f, doc);
            return Status.OK_STATUS;
        } catch (IOException e) {
            return new Status(IStatus.ERROR, pluginId, "Failed to strip text from PDF document " + url + ".", e);
        }
    }

}