/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.
 *
 */

/* $Id$  */

package org.apache.lenya.cms.cocoon.components.modules.input;

import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.Iterator;
import java.util.Map;

import org.apache.avalon.framework.configuration.Configuration;
import org.apache.avalon.framework.configuration.ConfigurationException;
import org.apache.cocoon.environment.ObjectModelHelper;
import org.apache.cocoon.environment.Request;
import org.apache.commons.lang.StringUtils;
import org.apache.lenya.cms.publication.Document;
import org.apache.lenya.cms.publication.DocumentBuildException;
import org.apache.lenya.cms.publication.DocumentLocator;
import org.apache.lenya.cms.publication.PageEnvelope;
import org.apache.lenya.cms.publication.Publication;
import org.apache.lenya.cms.publication.ResourceType;
import org.apache.lenya.cms.site.SiteException;
import org.apache.lenya.util.ServletHelper;

/**
 * Input module wrapping the page envelope. This module provides publication
 * related information such as document-uuid, area, publication-id.
 * 
 * @see org.apache.lenya.cms.publication.PageEnvelope
 * @deprecated use DocumentInfoModule instead.
 */
public class PageEnvelopeModule extends AbstractPageEnvelopeModule {

    protected static final String URI_PARAMETER_DOCTYPE = "doctype";
    
    /**
     * @see org.apache.cocoon.components.modules.input.InputModule#getAttribute(java.lang.String,
     *      org.apache.avalon.framework.configuration.Configuration,
     *      java.util.Map)
     */
    public Object getAttribute(final String attributeName, Configuration modeConf, Map objectModel)
            throws ConfigurationException {

        final String name = getAttributeName(attributeName);

        if (!Arrays.asList(PageEnvelope.PARAMETER_NAMES).contains(name)) {
            throw new ConfigurationException("The attribute [" + name + "] is not supported!");
        }

        PageEnvelope envelope = getEnvelope(objectModel, attributeName);
        Object value = null;

        try {
            if (name.equals(PageEnvelope.AREA)) {
                value = envelope.getArea();
            } else if (name.equals(PageEnvelope.CONTEXT)) {
                value = envelope.getContext();
            } else if (name.equals(PageEnvelope.IS_PUBLICATION)) {
                value = Boolean.toString(envelope.getPublication() != null);
            } else if (name.equals(PageEnvelope.PUBLICATION_ID)) {
                Publication pub = envelope.getPublication();
                value = pub != null ? pub.getId() : "";
            } else if (name.equals(PageEnvelope.PUBLICATION)) {
                value = envelope.getPublication();
            } else if (name.equals(PageEnvelope.PUBLICATION_LANGUAGES_CSV)) {
                value = StringUtils.join(envelope.getPublication().getLanguages(), ',');
            } else if (name.equals(PageEnvelope.DEFAULT_LANGUAGE)) {
                value = envelope.getPublication().getDefaultLanguage();
            } else if (name.equals(PageEnvelope.LANGUAGE)) {
                value = envelope.getLanguage();
            } else if (name.equals(PageEnvelope.BREADCRUMB_PREFIX)) {
                value = envelope.getPublication().getBreadcrumbPrefix();
            } else if (name.equals(PageEnvelope.DOCUMENT_PATH)) {
                value = getPath(envelope, objectModel);
            } else {
                Document document = envelope.getDocument();
                if (document != null) {
                    if (name.equals(PageEnvelope.DOCUMENT)) {
                        value = document;
                    } else if (name.equals(PageEnvelope.DOCUMENT_ID)) {
                        getLogger().warn(
                                "This attribute [ " + name + " ] is deprecated."
                                        + " Use document-path or document-uuid instead!");
                        value = document.getUUID();
                    } else if (name.equals(PageEnvelope.DOCUMENT_PARENT)) {
                        value = document.getLocator().getParent().getPath();
                    } else if (name.equals(PageEnvelope.DOCUMENT_NAME)) {
                        value = document.getName();
                    } else if (name.equals(PageEnvelope.DOCUMENT_LABEL)) {
                        value = document.getLink().getLabel();
                    } else if (name.equals(PageEnvelope.DOCUMENT_URL)) {
                        value = document.getCanonicalDocumentURL();
                    } else if (name.equals(PageEnvelope.DOCUMENT_URL_WITHOUT_LANGUAGE)) {
                        value = document.getCanonicalWebappURL();
                    } else if (name.equals(PageEnvelope.DOCUMENT_FILE)) {
                        value = document.getFile();
                    } else if (name.equals(PageEnvelope.DOCUMENT_EXTENSION)) {
                        value = document.getExtension();
                    } else if (name.equals(PageEnvelope.DOCUMENT_SOURCE_EXTENSION)) {
                        value = document.getSourceExtension();
                    } else if (name.equals(PageEnvelope.DOCUMENT_UUID)) {
                        value = document.getUUID();
                    } else if (name.equals(PageEnvelope.DOCUMENT_LANGUAGE)) {
                        value = document.getLanguage();
                    } else if (name.equals(PageEnvelope.DOCUMENT_LANGUAGES)) {
                        value = document.getLanguages();
                    } else if (name.equals(PageEnvelope.DOCUMENT_LANGUAGES_CSV)) {
                        value = StringUtils.join(document.getLanguages(), ',');
                    } else if (name.equals(PageEnvelope.DOCUMENT_LASTMODIFIED)) {
                        Date date = new Date(document.getLastModified());
                        value = new SimpleDateFormat(DATE_FORMAT).format(date);
                    } else if (name.equals(PageEnvelope.DOCUMENT_TYPE)) {
                        ResourceType resourceType = document.getResourceType();
                        if (resourceType == null) {
                            value = null;
                        } else {
                            value = resourceType.getName();
                        }
                    }
                }
            }
        } catch (final Exception e) {
            throw new ConfigurationException("Getting attribute for name [" + name + "] failed: ",
                    e);
        }

        if (getLogger().isDebugEnabled()) {
            getLogger().debug("Returning [" + name + "] = [" + value + "]");
        }

        return value;
    }

    protected String getPath(PageEnvelope envelope, Map objectModel) throws SiteException {
        String path;
        Document doc = envelope.getDocument();
        if (doc == null) {
            Publication pub = envelope.getPublication();
            Request request = ObjectModelHelper.getRequest(objectModel);
            String url = ServletHelper.getWebappURI(request);
            DocumentLocator loc;
            try {
                loc = pub.getDocumentBuilder().getLocator(pub.getFactory(), url);
            } catch (DocumentBuildException e) {
                throw new SiteException(e);
            }
            path = loc.getPath();
        } else {
            path = doc.getLocator().getPath();
        }
        return path;
    }

    /**
     * <code>DATE_FORMAT</code> The date format
     */
    public static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss Z";

    /**
     * @see org.apache.cocoon.components.modules.input.InputModule#getAttributeNames(org.apache.avalon.framework.configuration.Configuration,
     *      java.util.Map)
     */
    public Iterator getAttributeNames(Configuration modeConf, Map objectModel)
            throws ConfigurationException {
        return Arrays.asList(PageEnvelope.PARAMETER_NAMES).iterator();
    }

    /**
     * @see org.apache.cocoon.components.modules.input.InputModule#getAttributeValues(java.lang.String,
     *      org.apache.avalon.framework.configuration.Configuration,
     *      java.util.Map)
     */
    public Object[] getAttributeValues(String name, Configuration modeConf, Map objectModel)
            throws ConfigurationException {
        Object[] objects = { getAttribute(name, modeConf, objectModel) };

        return objects;
    }

}