/*
   Copyright (C) 2005-2012, by the President and Fellows of Harvard College.

   Licensed 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.

   Dataverse Network - A web application to share, preserve and analyze research data.
   Developed at the Institute for Quantitative Social Science, Harvard University.
   Version 3.0.
*/
package edu.harvard.iq.dvn.core.web.dataaccess;

import java.io.File;
import java.io.FileInputStream;
import java.io.OutputStream; 
import java.io.FileOutputStream; 
import java.io.IOException;

import edu.harvard.iq.dvn.core.study.Study;
import edu.harvard.iq.dvn.core.study.Metadata;

import edu.harvard.iq.dvn.core.util.StringUtil;

/**
 *
 * @author leonidandreev
 */
public class ExportTermsOfUse {
    private static String dvnTermsOfUse = null; 
    
    public ExportTermsOfUse() {
    } 
        
    public static FileAccessObject export (Study study) {
        return export (study, null);
    }
    
    public static FileAccessObject export (Study study, String dvnTermsOfUse) {
        String dvTermsOfUse = null;
        String studyTermsOfUse = null;
        FileAccessObject touDownload = null; 
        
        String termsOfUseExported = ""; 
        
        // Network level: 
        
        if (!StringUtil.isEmpty(dvnTermsOfUse)) {
            termsOfUseExported = "Dataverse Network-level Terms of Use:\n";
            termsOfUseExported = termsOfUseExported.concat( dvnTermsOfUse );
            termsOfUseExported = termsOfUseExported.concat("\n");            
        }
        
        // Dataverse level: 
        
        if (!study.isIsHarvested() ) {
            dvTermsOfUse = study.getOwner().isDownloadTermsOfUseEnabled() ? study.getOwner().getDownloadTermsOfUse() : null;
        }
        
        if (!StringUtil.isEmpty(dvTermsOfUse)) {
            termsOfUseExported = "Dataverse-level Terms of Use:\n";
            termsOfUseExported = termsOfUseExported.concat( dvTermsOfUse );
            termsOfUseExported = termsOfUseExported.concat("\n");  
        }
        
        // Study level: 
        
        if (study.getReleasedVersion() != null) {
            Metadata metadataReleased = study.getReleasedVersion().getMetadata();
            if ( metadataReleased != null) {
                studyTermsOfUse = metadataReleased.getTermsOfUseAsString();
            }
        }
        
        if (!StringUtil.isEmpty(studyTermsOfUse)) {
            termsOfUseExported = "Study-level Terms of Use:\n";
            termsOfUseExported = termsOfUseExported.concat( studyTermsOfUse );
            termsOfUseExported = termsOfUseExported.concat("\n");  
        }

        
        // Save as a temp file:
        
        if (!StringUtil.isEmpty(termsOfUseExported)) {
            try {
                File tempTOU = File.createTempFile("TermsOfUse.", ".txt");
                OutputStream outTOU = new FileOutputStream(tempTOU);
                outTOU.write(termsOfUseExported.getBytes());
                outTOU.close();
                
                touDownload = new FileAccessObject(); 
                
                touDownload.setInputStream(new FileInputStream(tempTOU));
                touDownload.setIsLocalFile(true);
                touDownload.setMimeType("text/plain");
                touDownload.setFileName(tempTOU.getName());                   
                touDownload.setNoVarHeader(true);
                touDownload.setVarHeader(null);

                
            } catch (IOException ex) {
                return null; 
            }
        }
                
        return touDownload;  
    }
    
}