package org.kuali.common.devops.jenkins.archive;
   
   import static com.google.common.base.Preconditions.checkNotNull;
   import static java.nio.file.Files.isDirectory;
   import static java.nio.file.Files.isRegularFile;
   import static java.nio.file.Files.isSymbolicLink;
   import static org.kuali.common.core.io.Paths.getRealPath;
   
   import java.nio.file.Path;
  import java.nio.file.Paths;
  
  import org.kuali.common.core.build.ValidatingBuilder;
  import org.kuali.common.core.validate.annotation.IdiotProofImmutable;
  
  import com.google.common.base.Predicate;
  
  @IdiotProofImmutable
  public final class JenkinsBuildPredicate implements Predicate<Path> {
  
  	private final int requiredLength;
  	private final String requiredPrefix;
  	private final String buildXml;
  
  	@Override
  	public boolean apply(Path dir) {
  		checkNotNull(dir);
  
  		// skip symbolic links and anything that's not a directory
  		if (isSymbolicLink(dir) || !isDirectory(dir)) {
  			return false;
  		}
  
  		// Extract the name of the directory
  		String name = dir.getFileName().toString();
  
  		// Make sure it has the required prefix
  		boolean hasPrefix = name.startsWith(requiredPrefix);
  
  		// Make sure it is the required length
  		boolean properLength = name.length() == requiredLength;
  
  		// Make sure this directory contains a file called build.xml
  		boolean hasBuildXml = isRegularFile(Paths.get(getRealPath(dir).toString() + "/" + buildXml));
  
  		// If it's got the right prefix, proper length, and has a build.xml, we are good to go
  		return hasPrefix && properLength && hasBuildXml;
  
  	}
  
  	private JenkinsBuildPredicate(Builder builder) {
  		this.requiredLength = builder.requiredLength;
  		this.requiredPrefix = builder.requiredPrefix;
  		this.buildXml = builder.buildXml;
  	}
  
  	public static JenkinsBuildPredicate build() {
  		return builder().build();
  	}
  
  	public static Builder builder() {
  		return new Builder();
  	}
  
  	public static class Builder extends ValidatingBuilder<JenkinsBuildPredicate> {
  
  		private int requiredLength = "2014-08-20_18-34-13".length();
  		private String requiredPrefix = "20";
  		private String buildXml = "build.xml";
  
  		public Builder withRequiredLength(int requiredLength) {
  			this.requiredLength = requiredLength;
  			return this;
  		}
  
  		public Builder withRequiredPrefix(String requiredPrefix) {
  			this.requiredPrefix = requiredPrefix;
  			return this;
  		}
  
  		public Builder withBuildXml(String buildXml) {
  			this.buildXml = buildXml;
  			return this;
  		}
  
  		@Override
  		public JenkinsBuildPredicate build() {
  			return validate(new JenkinsBuildPredicate(this));
  		}
  	}
  
  	public int getRequiredLength() {
  		return requiredLength;
  	}
  
  	public String getRequiredPrefix() {
  		return requiredPrefix;
  	}
  
  	public String getBuildXml() {
 		return buildXml;
 	}
 
 }