/*
 * Copyright (c) 2010-2011 The Regents of the University of California.
 * All rights reserved.
 *
 * '$Author: crawl $'
 * '$Date: 2012-11-26 22:22:04 +0000 (Mon, 26 Nov 2012) $' 
 * '$Revision: 31121 $'
 * 
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and its documentation for any purpose, provided that the above
 * copyright notice and the following two paragraphs appear in all copies
 * of this software.
 *
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY
 * FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
 * THE UNIVERSITY OF CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE
 * PROVIDED HEREUNDER IS ON AN "AS IS" BASIS, AND THE UNIVERSITY OF
 * CALIFORNIA HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES,
 * ENHANCEMENTS, OR MODIFICATIONS.
 *
 */

package org.kepler.objectmanager.repository;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Frame;
import java.io.File;

import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JProgressBar;

import org.kepler.kar.karxml.KarXml;

/**
 * Created by IntelliJ IDEA.
 * User: sean
 * Date: Mar 24, 2010
 * Time: 11:48:05 AM
 */

public class KARDownloader {
        
        private String karPath = null;
        private String karName = null;
        private static KARDownloader instance = null;
        private JDialog dialog;
        private JProgressBar progressBar;
        private long downloadedByteTotal = 0;
        private long karFileSize;

        public static KARDownloader getInstance() {
                if (instance == null) {
                        instance = new KARDownloader();
                }
                return instance;
        }
        
        private KARDownloader() {
                setupProgressBar();
        }
        
        private void setupProgressBar() {
                progressBar = new JProgressBar(0, 100);
                progressBar.setPreferredSize(new Dimension(175, 20));
                progressBar.setString("Downloading");
                progressBar.setStringPainted(false);
                progressBar.setValue(0);
                
                JLabel label = new JLabel("Progress: ");
                JPanel panel = new JPanel();
                
                panel.add(label);
                panel.add(progressBar);
                
                dialog = new JDialog((Frame) null, "Downloading...", false);
                dialog.getContentPane().add(panel, BorderLayout.CENTER);
                dialog.pack();
        }

        public void updateDownloadProgress(int bytes) {
                if (bytes == -1) {
                        // The stream is over
                        progressBar.setValue(100);
                        dialog.setVisible(false);
//                      dialog.dispose();
                        return;
                }
                
                // Update downloaded total
                downloadedByteTotal += bytes;
                progressBar.setValue((int) ((downloadedByteTotal * 100) / karFileSize));                
        }
        
        /**
         * Download a KAR. 
         * @param karLSID
         * @param karSize
         * @param repositoryName
         * @return downloaded File, or null.
         */
        public File download(String karLSID, Long karSize, String repositoryName, boolean authenticate){

                karFileSize = karSize;
                dialog.setLocationRelativeTo(null);
                dialog.setVisible(true);
                
                if (karLSID == null || karLSID.length()==0 || 
                                repositoryName == null || repositoryName.length()==0){
                        System.out.println("KARDownloader download(karLSID, karSize, repositoryName) got null or empty lsid " +
                                        "or repositoryName!");
                        return null;
                }
                
                try {
                        progressBar.setValue(0);
                        EcogridRepositoryResults result = new EcogridRepositoryResults(karLSID, repositoryName, authenticate);
                        result.setDownloader(this);
                        File local = result.cacheKAR(authenticate);
                        return local;
                }
                catch(RepositoryException ex) {
                        System.out.println("Caught repository exception!");
                        dialog.setVisible(false);
                        ex.printStackTrace();
                }
                
                return null;
        }
        
        /**
         * Given karXML for a KAR, download KAR.
         * @see download(String karLSID, Long karSize, String repositoryName) for alternative 
         * you may want to use to avoid having to download karXml.
         * @param karXml
         * @return kar File
         */
        public File download(KarXml karXml, boolean authenticate) {
                
                karFileSize = karXml.getSize();
                
                dialog.setLocationRelativeTo(null);
                dialog.setVisible(true);

                String lsid = karXml.getLsid();
                String repositoryName = karXml.getRepositoryName();
                
                if (lsid == null || lsid.length()==0 || 
                                repositoryName == null || repositoryName.length()==0){
                        System.out.println("KARDownloader download(karxml) got null or empty lsid " +
                                        "or repositoryName from karXml!");
                        return null;
                }
                
                try {
                        progressBar.setValue(0);
                        EcogridRepositoryResults result = 
                                new EcogridRepositoryResults(lsid, repositoryName, authenticate);
                        result.setDownloader(this);
                        File local = result.cacheKAR(authenticate);
                        return local;
                }
                catch(RepositoryException ex) {
                        System.out.println("Caught repository exception!");
                        ex.printStackTrace();
                }
                
                return null;
        }

        public void setKarPath(String karPath) {
                System.out.println("KARDownloader setKarPath() - " + karPath);
                this.karPath = karPath;
        }

        public String getKarPath() {
                return karPath;
        }
        
        public void setKarName(String karName) {
                System.out.println("KARDownloader setKarName() - " + karName);
                this.karName = karName;
        }
        
        public String getKarName() {
                return karName;
        }
}