package org.openslx.taskmanager.tasks;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.compress.archivers.ArchiveEntry;
import org.apache.commons.compress.archivers.ArchiveException;
import org.apache.commons.compress.archivers.ArchiveInputStream;
import org.apache.commons.io.FilenameUtils;
import org.openslx.satserver.util.Archive;
import org.openslx.satserver.util.Util;
import org.openslx.taskmanager.api.AbstractTask;

import com.google.gson.annotations.Expose;

public class ListArchive extends AbstractTask
{

	@Expose
	private String file;

	/*
	 * Own vars/constants not being deserialized
	 */

	protected static final String[] ALLOWED_DIRS =
	{ "/tmp/", "/opt/openslx/" };

	private Output status = new Output();

	/*
	 * Code
	 */

	@Override
	protected boolean execute()
	{
		ArchiveInputStream archive;
		try {
			archive = Archive.getArchiveInputStream( this.file );
		} catch ( FileNotFoundException e1 ) {
			status.error = e1.getMessage();
			status.errorCode = Output.ErrorCode.NOT_FOUND;
			return false;
		} catch ( IllegalArgumentException e1 ) {
			status.error = e1.getMessage();
			status.errorCode = Output.ErrorCode.UNKNOWN_ERROR;
			return false;
		} catch ( ArchiveException e1 ) {
			status.error = e1.getMessage();
			status.errorCode = Output.ErrorCode.UNKNOWN_FORMAT;
			return false;
		}

		List<Output.Entry> entries = new ArrayList<>();

		ArchiveEntry archiveEntry;
		try {
			// Iterate over every entry
			while ( ( archiveEntry = archive.getNextEntry() ) != null ) {
				if ( !archive.canReadEntryData( archiveEntry ) )
					continue;
				Output.Entry entry = new Output.Entry();
				entry.name = archiveEntry.getName();
				entry.isdir = archiveEntry.isDirectory();
				entry.size = archiveEntry.getSize();
				entries.add( entry );
			}
		} catch ( IOException e ) {
			return false;
		}
		status.entries = entries;
		return true;
	}

	@Override
	protected boolean initTask()
	{
		this.setStatusObject( this.status );
		if ( this.file == null || this.file.length() == 0 || this.file.charAt( 0 ) != '/' ) {
			status.error = "Need absolute path.";
			status.errorCode = Output.ErrorCode.INVALID_DIRECTORY;
			return false;
		}
		this.file = FilenameUtils.normalize( this.file );
		if ( this.file == null || !Util.startsWith( this.file, ALLOWED_DIRS ) ) {
			status.error = "File not in allowed directory";
			status.errorCode = Output.ErrorCode.INVALID_DIRECTORY;
			return false;
		}
		return true;
	}

	@SuppressWarnings( "unused" )
	private static class Output
	{
		protected String error = null;

		protected enum ErrorCode
		{
			NOT_FOUND, UNKNOWN_FORMAT, UNKNOWN_ERROR, INVALID_DIRECTORY
		};

		protected ErrorCode errorCode = null;
		protected List<Entry> entries = null;

		public static class Entry
		{
			protected String name = null;
			protected boolean isdir = false;
			protected long size = -1;
		}
	}

}