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/*
 * Copyright (C) 2010, 2012 Chris Aniszczyk  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.openrewrite.jgit.api;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

import org.openrewrite.jgit.api.errors.GitAPIException;
import org.openrewrite.jgit.api.errors.JGitInternalException;
import org.openrewrite.jgit.api.errors.NoFilepatternException;
import org.openrewrite.jgit.dircache.DirCache;
import org.openrewrite.jgit.dircache.DirCacheBuildIterator;
import org.openrewrite.jgit.dircache.DirCacheBuilder;
import org.openrewrite.jgit.events.WorkingTreeModifiedEvent;
import org.openrewrite.jgit.internal.JGitText;
import org.openrewrite.jgit.lib.Constants;
import org.openrewrite.jgit.lib.FileMode;
import org.openrewrite.jgit.lib.Repository;
import org.openrewrite.jgit.treewalk.TreeWalk;
import org.openrewrite.jgit.treewalk.filter.PathFilterGroup;

/**
 * Remove files from the index and working directory (or optionally only from
 * the index).
 * 
 * It has setters for all supported options and arguments of this command and a
 * {@link #call()} method to finally execute the command. Each instance of this
 * class should only be used for one invocation of the command (means: one call
 * to {@link #call()}).
 * 

 * Examples (git is a {@link org.openrewrite.jgit.api.Git} instance):
 * 

 * Remove file "test.txt" from both index and working directory:
 *
 * 
 * git.rm().addFilepattern("test.txt").call();
 * 
 * 
 * Remove file "new.txt" from the index (but not from the working directory):
 *
 * 
 * git.rm().setCached(true).addFilepattern("new.txt").call();
 * 
 *
 * @see Git documentation about Rm
 */
public class RmCommand extends GitCommand {

	private Collection filepatterns;

	/** Only remove files from index, not from working directory */
	private boolean cached = false;

	/**
	 * Constructor for RmCommand.
	 *
	 * @param repo
	 *            the {@link org.openrewrite.jgit.lib.Repository}
	 */
	public RmCommand(Repository repo) {
		super(repo);
		filepatterns = new LinkedList<>();
	}

	/**
	 * Add file name pattern of files to be removed
	 *
	 * @param filepattern
	 *            repository-relative path of file to remove (with
	 *            / as separator)
	 * @return {@code this}
	 */
	public RmCommand addFilepattern(String filepattern) {
		checkCallable();
		filepatterns.add(filepattern);
		return this;
	}

	/**
	 * Only remove the specified files from the index.
	 *
	 * @param cached
	 *            {@code true} if files should only be removed from index,
	 *            {@code false} if files should also be deleted from the working
	 *            directory
	 * @return {@code this}
	 * @since 2.2
	 */
	public RmCommand setCached(boolean cached) {
		checkCallable();
		this.cached = cached;
		return this;
	}

	/**
	 * {@inheritDoc}
	 * 
	 * Executes the {@code Rm} command. Each instance of this class should only
	 * be used for one invocation of the command. Don't call this method twice
	 * on an instance.
	 */
	@Override
	public DirCache call() throws GitAPIException,
			NoFilepatternException {

		if (filepatterns.isEmpty())
			throw new NoFilepatternException(JGitText.get().atLeastOnePatternIsRequired);
		checkCallable();
		DirCache dc = null;

		List actuallyDeletedFiles = new ArrayList<>();
		try (TreeWalk tw = new TreeWalk(repo)) {
			dc = repo.lockDirCache();
			DirCacheBuilder builder = dc.builder();
			tw.reset(); // drop the first empty tree, which we do not need here
			tw.setRecursive(true);
			tw.setFilter(PathFilterGroup.createFromStrings(filepatterns));
			tw.addTree(new DirCacheBuildIterator(builder));

			while (tw.next()) {
				if (!cached) {
					final FileMode mode = tw.getFileMode(0);
					if (mode.getObjectType() == Constants.OBJ_BLOB) {
						String relativePath = tw.getPathString();
						final File path = new File(repo.getWorkTree(),
								relativePath);
						// Deleting a blob is simply a matter of removing
						// the file or symlink named by the tree entry.
						if (delete(path)) {
							actuallyDeletedFiles.add(relativePath);
						}
					}
				}
			}
			builder.commit();
			setCallable(false);
		} catch (IOException e) {
			throw new JGitInternalException(
					JGitText.get().exceptionCaughtDuringExecutionOfRmCommand, e);
		} finally {
			try {
				if (dc != null) {
					dc.unlock();
				}
			} finally {
				if (!actuallyDeletedFiles.isEmpty()) {
					repo.fireEvent(new WorkingTreeModifiedEvent(null,
							actuallyDeletedFiles));
				}
			}
		}

		return dc;
	}

	private boolean delete(File p) {
		boolean deleted = false;
		while (p != null && !p.equals(repo.getWorkTree()) && p.delete()) {
			deleted = true;
			p = p.getParentFile();
		}
		return deleted;
	}

}