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/*
   D-Bus Java Viewer
   Copyright (c) 2006 Peter Cox

   This program is free software; you can redistribute it and/or modify it
   under the terms of either the GNU Lesser General Public License Version 2 or the
   Academic Free Licence Version 2.1.

   Full licence texts are included in the COPYING file with this program.
*/
package org.freedesktop.dbus.viewer;

import static org.freedesktop.dbus.Gettext._;

import java.awt.Component;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Iterator;

import javax.swing.JOptionPane;

final class FileSaver implements Runnable
{
	private static final String CANCEL = "Cancel";

	private static final String SKIP_ALL = "Skip All";

	private static final String SKIP = "Skip";

	private static final String OVERWRITE = "Overwrite";

	private static final String OVERWRITE_ALL = "Overwrite All";

	private final File parentDirectory;

	private final Component parentComponent;

	private final Iterable textFiles;

	FileSaver(Component parentComponent, File parentDirectory,
			Iterable files)
	{
		this.parentComponent = parentComponent;
		this.parentDirectory = parentDirectory;
		this.textFiles = files;
	}

	/** {@inheritDoc} */
	public void run()
	{
		saveFiles();
	}

	private void saveFiles()
	{
		String overwritePolicy = null;
		final Iterator iterator = textFiles.iterator();
		while (iterator.hasNext())
		{
			final TextFile textFile = iterator.next();
			String fileName = textFile.getFileName();
			File fileToSave = new File(parentDirectory, fileName);
			File parentFile = fileToSave.getParentFile();
			if (parentFile.exists() || parentFile.mkdirs())
			{
				boolean doSave = !fileToSave.exists()
						|| OVERWRITE_ALL.equals(overwritePolicy);
				if (!doSave && !SKIP_ALL.equals(overwritePolicy))
				{
					String[] selectionValues;
					if (iterator.hasNext())
					{
						selectionValues = new String[] { OVERWRITE,
								OVERWRITE_ALL, SKIP, SKIP_ALL, CANCEL };
					}
					else
					{
						selectionValues = new String[] { OVERWRITE, CANCEL };
					}
					int option = JOptionPane.showOptionDialog(parentComponent,
							"File exists: " + fileName, "Save",
							JOptionPane.YES_NO_CANCEL_OPTION,
							JOptionPane.QUESTION_MESSAGE, null,
							selectionValues, null);
					if (option == -1)
					{
						break;
					}
					overwritePolicy = selectionValues[option];
					if (CANCEL.equals(overwritePolicy))
					{
						break;
					}

					doSave = OVERWRITE.equals(overwritePolicy)
							|| OVERWRITE_ALL.equals(overwritePolicy);
				}
				if (doSave)
				{
					try
					{
						String contents = textFile.getContents();
						writeFile(fileToSave, contents);
					}
					catch (final IOException ex)
					{
						/* Can't access parent directory for saving */
						final String errorMessage = "Could not save "
								+ fileName + ": " + ex.getLocalizedMessage();
						if (iterator.hasNext())
						{

							int confirm = JOptionPane.showConfirmDialog(
									parentComponent, errorMessage
											+ ".\n"+_("Try saving other files?"),
									_("Save Failed"),
									JOptionPane.OK_CANCEL_OPTION,
									JOptionPane.ERROR_MESSAGE);
							if (confirm != JOptionPane.OK_OPTION)
							{
								break;
							}
						}
						else
						{
							JOptionPane.showMessageDialog(parentComponent,
									errorMessage + ".", _("Save Failed"),
									JOptionPane.ERROR_MESSAGE);
						}
					}
				}
			}
			else
			{

				final String errorMessage = _("Could not access parent directory for ")
						+ fileName;
				if (iterator.hasNext())
				{

					int confirm = JOptionPane.showConfirmDialog(
							parentComponent, errorMessage
									+ ".\n"+_("Try saving other files?"),
							_("Save Failed"), JOptionPane.OK_CANCEL_OPTION,
							JOptionPane.ERROR_MESSAGE);
					if (confirm != JOptionPane.OK_OPTION)
					{
						break;
					}
				}
				else
				{
					JOptionPane.showMessageDialog(parentComponent, errorMessage
							+ ".", _("Save Failed"), JOptionPane.ERROR_MESSAGE);
				}
			}
		}
	}

	/**
	 * @param fileToSave
	 * @param contents
	 * @throws IOException
	 */
	private void writeFile(File fileToSave, String contents) throws IOException
	{
		FileWriter fileWriter = null;
		try
		{
			fileWriter = new FileWriter(fileToSave);
			BufferedWriter writer = new BufferedWriter(fileWriter);
			writer.append(contents);
			writer.flush();
		}
		finally
		{
			if (fileWriter != null)
			{
				try
				{
					fileWriter.close();
				}
				catch (IOException e1)
				{
				}
			}
		}
	}
}