/*
Copyright 2008-2016 Gephi
Authors : Eduardo Ramos <eduardo.ramos@gephi.org>
Website : http://www.gephi.org

This file is part of Gephi.

DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.

Copyright 2016 Gephi Consortium. All rights reserved.

The contents of this file are subject to the terms of either the GNU
General Public License Version 3 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
http://gephi.org/about/legal/license-notice/
or /cddl-1.0.txt and /gpl-3.0.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 files at
/cddl-1.0.txt and /gpl-3.0.txt. If applicable, add the following below the
License Header, with the fields enclosed by brackets [] replaced by
your own identifying information:
"Portions Copyrighted [year] [name of copyright owner]"

If you wish your version of this file to be governed by only the CDDL
or only the GPL Version 3, indicate your decision by adding
"[Contributor] elects to include this software in this distribution
under the [CDDL or GPL Version 3] license." If you do not indicate a
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your version of this file under either the CDDL, the GPL Version 3 or
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However, if you add GPL Version 3 code and therefore, elected the GPL
Version 3 license, then the option applies only if the new code is
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Contributor(s):

Portions Copyrighted 2016 Gephi Consortium.
 */

package org.gephi.io.importer.plugin.file.spreadsheet;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.gephi.io.importer.plugin.file.spreadsheet.process.SpreadsheetGeneralConfiguration;
import org.gephi.io.importer.plugin.file.spreadsheet.sheet.EmptySheet;
import org.gephi.io.importer.plugin.file.spreadsheet.sheet.ErrorSheet;
import org.gephi.io.importer.plugin.file.spreadsheet.sheet.SheetParser;
import org.gephi.io.importer.plugin.file.spreadsheet.sheets.excel.ExcelSheetParser;

/**
 * @author Eduardo Ramos
 */
public class ImporterSpreadsheetExcel extends AbstractImporterSpreadsheet {

    private int sheetIndex = 0;

    @Override
    public SheetParser createParserWithoutHeaders() throws IOException {
        return createParser(false);
    }

    @Override
    public SheetParser createParser() throws IOException {
        boolean withFirstRecordAsHeader = generalConfig.getMode() == SpreadsheetGeneralConfiguration.Mode.NODES_TABLE ||
            generalConfig.getMode() == SpreadsheetGeneralConfiguration.Mode.EDGES_TABLE;
        return createParser(withFirstRecordAsHeader);
    }

    private SheetParser createParser(boolean withFirstRecordAsHeader) throws IOException {
        try {
            boolean readOnly = true;
            Workbook workbook = WorkbookFactory.create(file, null, readOnly);
            Sheet sheet = workbook.getSheetAt(sheetIndex);

            return new ExcelSheetParser(sheet, withFirstRecordAsHeader);
        } catch (Exception ex) {
            //Control and report old excel files are unsupported:
            //Control and report excel file blocked by another process (normally excel itself):

            if (report != null) {
                SpreadsheetUtils.logError(report, ex.getMessage(), null);
                return EmptySheet.INSTANCE;
            } else {
                return new ErrorSheet(ex.getMessage());
            }
        }
    }

    public String[] getAvailableSheetNames() {
        try (Workbook workbook = WorkbookFactory.create(file)) {
            int length = workbook.getNumberOfSheets();

            String[] names = new String[length];
            for (int i = 0; i < length; i++) {
                names[i] = workbook.getSheetName(i);
            }

            return names;
        } catch (Exception ex) {
            Logger.getLogger("").log(Level.SEVERE, ex.getMessage());
            return new String[] {"Error"};
        }
    }

    public int getSheetIndex() {
        return sheetIndex;
    }

    public void setSheetIndex(int sheetIndex) {
        this.sheetIndex = sheetIndex;
    }
}
