/*
    * Copyright (C) 2011, Ketan Padegaonkar <KetanPadegaonkar@gmail.com> and others
    *
    * This program and the accompanying materials are made available under the
    * terms of the Eclipse Distribution License v. 1.0 which is available at
    * https://www.eclipse.org/org/documents/edl-v10.php.
    *
    * SPDX-License-Identifier: BSD-3-Clause
    */
  package org.eclipse.jgit.ant.tasks;
  
  import java.io.File;
  import java.io.IOException;
  
  import org.apache.tools.ant.BuildException;
  import org.apache.tools.ant.Project;
  import org.apache.tools.ant.Task;
  import org.apache.tools.ant.types.DirSet;
  import org.apache.tools.ant.types.FileSet;
  import org.apache.tools.ant.types.resources.Union;
  import org.eclipse.jgit.api.AddCommand;
  import org.eclipse.jgit.api.Git;
  import org.eclipse.jgit.api.errors.GitAPIException;
  import org.eclipse.jgit.lib.Repository;
  import org.eclipse.jgit.lib.RepositoryCache;
  import org.eclipse.jgit.storage.file.FileRepositoryBuilder;
  import org.eclipse.jgit.util.FS;
  
  /**
   * Adds a file to the git index.
   *
   * @see <a href="http://www.kernel.org/pub/software/scm/git/docs/git-add.html"
   *      >git-add(1)</a>
   */
  public class GitAddTask extends Task {
  
  	private File src;
  	private Union path;
  
  	/**
  	 * <p>Set the field <code>src</code>.</p>
  	 *
  	 * @param src
  	 *            the src to set
  	 */
  	public void setSrc(File src) {
  		this.src = src;
  	}
  
  	/**
  	 * Add a set of files to add.
  	 *
  	 * @param set
  	 *            a set of files to add.
  	 */
  	public void addFileset(FileSet set) {
  		getPath().add(set);
  	}
  
  	/**
  	 * Add a set of files to add.
  	 *
  	 * @param set
  	 *            a set of files to add.
  	 */
  	public void addDirset(DirSet set) {
  		getPath().add(set);
  	}
  
  	private synchronized Union getPath() {
  		if (path == null) {
  			path = new Union();
  			path.setProject(getProject());
  		}
  		return path;
  	}
  
  	/** {@inheritDoc} */
  	@Override
  	public void execute() throws BuildException {
  		if (src == null) {
  			throw new BuildException("Repository path not specified.");
  		}
  		if (!RepositoryCache.FileKey.isGitRepository(new File(src, ".git"),
  				FS.DETECTED)) {
  			throw new BuildException("Specified path (" + src
  					+ ") is not a git repository.");
  		}
  
  		AddCommand gitAdd;
  		try (Repository repo = new FileRepositoryBuilder().readEnvironment()
  				.findGitDir(src).build();
  			Git git = new Git(repo);) {
  			gitAdd = git.add();
  		} catch (IOException e) {
  			throw new BuildException("Could not access repository " + src, e);
  		}
  
  		try {
 			String prefix = src.getCanonicalPath();
 			String[] allFiles = getPath().list();
 
 			for (String file : allFiles) {
 				String toAdd = translateFilePathUsingPrefix(file, prefix);
 				log("Adding " + toAdd, Project.MSG_VERBOSE);
 				gitAdd.addFilepattern(toAdd);
 			}
 			gitAdd.call();
 		} catch (IOException | GitAPIException e) {
 			throw new BuildException("Could not add files to index." + src, e);
 		}
 
 	}
 
 	private String translateFilePathUsingPrefix(String file, String prefix)
 			throws IOException {
 		if (file.equals(prefix)) {
 			return ".";
 		}
 		return new File(file).getCanonicalPath().substring(prefix.length() + 1);
 	}
 
 }