/*
    * Copyright 2009-2010 the original author or authors.
    *
    * 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.
   */
  package org.springframework.batch.admin.service;
  
  import java.io.Serializable;
  import java.text.SimpleDateFormat;
  import java.util.Date;
  
  import org.springframework.util.StringUtils;
  
  /**
   * @author Dave Syer
   * 
   */
  @SuppressWarnings("serial")
  public class FileInfo implements Comparable<FileInfo>, Serializable {
  
  	private final static String TIMESTAMP_PATTERN = ".*\\.[0-9]*\\.[0-9]*";
  
  	private final String timestamp;
  
  	private final String path;
  
  	private final String shortPath;
  
  	private final boolean local;
  
  	public FileInfo(String path) {
  		this(path, null, true);
  	}
  
  	public FileInfo(String path, String timestamp, boolean local) {
  		super();
  		this.path = path.replace("\\", "/");
  		this.shortPath = extractPath(path, timestamp);
  		this.timestamp = extractTimestamp(path, timestamp);
  		this.local = local;
  	}
  	
  	public FileInfo shortPath() {
  		FileInfo info = new FileInfo(shortPath, timestamp, local);
  		return info;
  	}
  	
  	public String getPattern() {
  		if (path.matches(TIMESTAMP_PATTERN)) {
  			return path;
  		}
  		String extension = StringUtils.getFilenameExtension(path);
  		String prefix = extension == null ? path : path.substring(0, path.length() - extension.length() - 1);
  		if (prefix.matches(TIMESTAMP_PATTERN)) {
  			return path;
  		}
  		return prefix + ".*.*" + (extension==null ? "" : "." + extension);
  	}
  
  	private String extractPath(String path, String timestamp) {
  		if (path.matches(TIMESTAMP_PATTERN)) {
  			return path.substring(0, path.length() - 16);
  		}
  		String extension = StringUtils.getFilenameExtension(path);
  		String prefix = extension == null ? path : path.substring(0, path.length() - extension.length() - 1);
  		if (prefix.matches(TIMESTAMP_PATTERN)) {
  			return prefix.substring(0, prefix.length() - 16) + "." + extension;
  		}
  		return path;
  	}
  
  	private String extractTimestamp(String path, String timestamp) {
  		if (timestamp != null) {
  			return timestamp;
  		}
  		if (path.matches(TIMESTAMP_PATTERN)) {
  			return path.substring(path.length() - 15, path.length());
  		}
  		String extension = StringUtils.getFilenameExtension(path);
  		String prefix = extension == null ? path : path.substring(0, path.length() - extension.length() - 1);
  		if (prefix.matches(TIMESTAMP_PATTERN)) {
  			return prefix.substring(prefix.length() - 15, prefix.length());
  		}
  		return new SimpleDateFormat("yyyyMMdd.HHmmss").format(new Date());
  	}
  
  	/**
  	 * @return the local
  	 */
 	public boolean isLocal() {
 		return local;
 	}
 
 	/**
 	 * @return the locator
 	 */
 	public String getTimestamp() {
 		return timestamp;
 	}
 
 	public String getPath() {
 		return path;
 	}
 
 	public String getFileName() {
 		if (path.matches(TIMESTAMP_PATTERN)) {
 			return path;
 		}
 		String extension = StringUtils.getFilenameExtension(path);
 		String prefix = extension == null ? path : path.substring(0, path.length() - extension.length() - 1);
 		if (prefix.matches(TIMESTAMP_PATTERN)) {
 			return path;
 		}
 		return prefix + getSuffix() + (extension == null ? "" : "." + extension);
 	}
 
 	private String getSuffix() {
 		return "." + timestamp;
 	}
 
 	public int compareTo(FileInfo o) {
 		return shortPath.equals(o.shortPath) ? -timestamp.compareTo(o.timestamp) : path.compareTo(o.path);
 	}
 
 	public String toString() {
 		return "FileInfo [path=" + path + ", timestamp=" + timestamp + ", local=" + local + "]";
 	}
 
 }