/**
    * Copyright (C) 2008 Atlassian
    *
    * 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 com.atlassian.theplugin.commons.crucible.api.model;
  
  import java.io.Serializable;
  
  /**
   * @author Marek Went
   * @author Pawel Niewiadomski
   */
  @SuppressWarnings("serial")
  public class CrucibleVersionInfo implements Serializable, Comparable<CrucibleVersionInfo> {
  	private final String buildDate;
  
  	private final String releaseNumber;
  
  	private Integer major;
  	private Integer minor;
  	private Integer maintanance;
  	private String build;
  
  	public CrucibleVersionInfo(String releaseNumber, String buildDate) {
  		this.buildDate = buildDate;
  		this.releaseNumber = releaseNumber;
  		tokenizeVersionAndSetFields(releaseNumber);
  	}
  
  	public String getBuildDate() {
  		return buildDate;
  	}
  
  	public String getReleaseNumber() {
  		return releaseNumber;
  	}
  
  	public boolean isVersion2OrGreater() {
  		return (major != null && major >= 2);
  	}
  
  	public boolean isVersion21OrGreater() {
  		if (major == null || minor == null) {
  			return false;
  		}
  
  		if (major > 2 || (major == 2 && minor >= 1)) {
  			return true;
  		}
  
  		return false;
  	}
  
  	public boolean isVersion24OrGrater() {
  
  		if (major == null || minor == null) {
  			return false;
  		}
  
  		if (major > 2 || (major == 2 && minor >= 4)) {
  			return true;
  		}
  
  		return false;
  	}
  	private void tokenizeVersionAndSetFields(String number) {
  		String[] tokens = number.split("[.]");
  
  		major = null;
  		minor = null;
  		maintanance = null;
  		build = null;
  
  		try {
  			if (tokens.length > 0) {
  				major = Integer.valueOf(tokens[0]);
  				if (tokens.length > 1) {
  					minor = Integer.valueOf(tokens[1]);
  					if (tokens.length > 2) {
  						maintanance = Integer.valueOf(tokens[2]);
  						if (tokens.length > 3) {
  							build = tokens[3];
  						}
  					}
  				}
  			}
  		} catch (NumberFormatException e) {
 			// stop parsing
 		}
 	}
 
 	public Integer getMajor() {
 		return major;
 	}
 
 	public Integer getMinor() {
 		return minor;
 	}
 
 	public Integer getMaintanance() {
 		return maintanance;
 	}
 
 	public String getBuild() {
 		return build;
 	}
 
 	private int compareInts(Integer a, Integer b) {
 		if (a == null && b != null) {
 			return -1;
 		} else if (a != null && b == null) {
 			return 1;
 		} else if (a == null && b == null) {
 			return 0;
 		} else {
 			return a.compareTo(b);
 		}
 	}
 
 	public int compareTo(CrucibleVersionInfo o) {
 		int r = compareInts(major, o.major);
 		if (r == 0) {
 			r = compareInts(minor, o.minor);
 			if (r == 0) {
 				return compareInts(maintanance, o.maintanance);
 			} else {
 				return r;
 			}
 		} else {
 			return r;
 		}
 	}
 
 	@Override
 	public String toString() {
 		StringBuilder sb = new StringBuilder();
 		if (major != null) {
 			sb.append(major);
 			if (minor != null) {
 				sb.append(".");
 				sb.append(minor);
 				if (maintanance != null) {
 					sb.append(".");
 					sb.append(maintanance);
 					if (build != null) {
 						sb.append(".");
 						sb.append(build);
 					}
 				}
 			}
 		}
 		return sb.toString();
 	}
 }