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/*
 * 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.
 */
package org.apache.tika.parser.microsoft;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Date;

import org.apache.poi.hpsf.CustomProperties;
import org.apache.poi.hpsf.DocumentSummaryInformation;
import org.apache.poi.hpsf.MarkUnsupportedException;
import org.apache.poi.hpsf.NoPropertySetStreamException;
import org.apache.poi.hpsf.PropertySet;
import org.apache.poi.hpsf.SummaryInformation;
import org.apache.poi.hpsf.UnexpectedPropertySetTypeException;
import org.apache.poi.poifs.filesystem.DocumentEntry;
import org.apache.poi.poifs.filesystem.DocumentInputStream;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.PagedText;
import org.apache.tika.metadata.Property;

/**
 * Outlook Message Parser.
 */
class SummaryExtractor {

    private static final String SUMMARY_INFORMATION =
        SummaryInformation.DEFAULT_STREAM_NAME;

    private static final String DOCUMENT_SUMMARY_INFORMATION =
        DocumentSummaryInformation.DEFAULT_STREAM_NAME;

    private final Metadata metadata;

    public SummaryExtractor(Metadata metadata) {
        this.metadata = metadata;
    }

    public void parseSummaries(POIFSFileSystem filesystem)
            throws IOException, TikaException {
        parseSummaryEntryIfExists(filesystem, SUMMARY_INFORMATION);
        parseSummaryEntryIfExists(filesystem, DOCUMENT_SUMMARY_INFORMATION);
    }

    private void parseSummaryEntryIfExists(
            POIFSFileSystem filesystem, String entryName)
            throws IOException, TikaException {
        try {
            DocumentEntry entry =
                (DocumentEntry) filesystem.getRoot().getEntry(entryName);
            PropertySet properties =
                new PropertySet(new DocumentInputStream(entry));
            if (properties.isSummaryInformation()) {
                parse(new SummaryInformation(properties));
            }
            if (properties.isDocumentSummaryInformation()) {
                parse(new DocumentSummaryInformation(properties));
            }
        } catch (FileNotFoundException e) {
            // entry does not exist, just skip it
        } catch (NoPropertySetStreamException e) {
            throw new TikaException("Not a HPSF document", e);
        } catch (UnexpectedPropertySetTypeException e) {
            throw new TikaException("Unexpected HPSF document", e);
        } catch (MarkUnsupportedException e) {
            throw new TikaException("Invalid DocumentInputStream", e);
        }
    }

    private void parse(SummaryInformation summary) {
        set(Metadata.TITLE, summary.getTitle());
        set(Metadata.AUTHOR, summary.getAuthor());
        set(Metadata.KEYWORDS, summary.getKeywords());
        set(Metadata.SUBJECT, summary.getSubject());
        set(Metadata.LAST_AUTHOR, summary.getLastAuthor());
        set(Metadata.COMMENTS, summary.getComments());
        set(Metadata.TEMPLATE, summary.getTemplate());
        set(Metadata.APPLICATION_NAME, summary.getApplicationName());
        set(Metadata.REVISION_NUMBER, summary.getRevNumber());
        set(Metadata.CREATION_DATE, summary.getCreateDateTime());
        set(Metadata.CHARACTER_COUNT, summary.getCharCount());
        set(Metadata.EDIT_TIME, summary.getEditTime());
        set(Metadata.LAST_SAVED, summary.getLastSaveDateTime());
        set(Metadata.PAGE_COUNT, summary.getPageCount());
        if (summary.getPageCount() > 0) {
            metadata.set(PagedText.N_PAGES, summary.getPageCount());
        }
        set(Metadata.SECURITY, summary.getSecurity());
        set(Metadata.WORD_COUNT, summary.getWordCount());
        set(Metadata.LAST_PRINTED, summary.getLastPrinted());
    }

    private void parse(DocumentSummaryInformation summary) {
        set(Metadata.COMPANY, summary.getCompany());
        set(Metadata.MANAGER, summary.getManager());
        set(Metadata.LANGUAGE, getLanguage(summary));
        set(Metadata.CATEGORY, summary.getCategory());
        set(Metadata.SLIDE_COUNT, summary.getSlideCount());
        if (summary.getSlideCount() > 0) {
            metadata.set(PagedText.N_PAGES, summary.getSlideCount());
        }
    }

    private String getLanguage(DocumentSummaryInformation summary) {
        CustomProperties customProperties = summary.getCustomProperties();
        if (customProperties != null) {
            Object value = customProperties.get("Language");
            if (value instanceof String) {
                return (String) value;
            }
        }
        return null;
    }

    private void set(String name, String value) {
        if (value != null) {
            metadata.set(name, value);
        }
    }

    private void set(Property property, Date value) {
        if (value != null) {
            metadata.set(property, value.toString());
        }
    }

    private void set(String name, Date value) {
        if (value != null) {
            metadata.set(name, value.toString());
        }
    }

    private void set(String name, long value) {
        if (value > 0) {
            metadata.set(name, Long.toString(value));
        }
    }

}