/*
 * Copyright 2015-2022 the original author or authors.
 *
 * All rights reserved. This program and the accompanying materials are
 * made available under the terms of the Eclipse Public License v2.0 which
 * accompanies this distribution and is available at
 *
 * https://www.eclipse.org/legal/epl-v20.html
 */

package org.junit.platform.engine.discovery;

import static org.apiguardian.api.API.Status.STABLE;

import java.io.File;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Objects;
import java.util.Optional;

import org.apiguardian.api.API;
import org.junit.platform.commons.util.ToStringBuilder;
import org.junit.platform.engine.DiscoverySelector;

/**
 * A {@link DiscoverySelector} that selects a file so that
 * {@link org.junit.platform.engine.TestEngine TestEngines}
 * can discover tests or containers based on files in the
 * file system.
 *
 * @since 1.0
 * @see DiscoverySelectors#selectFile(String)
 * @see DiscoverySelectors#selectFile(File)
 * @see DirectorySelector
 * @see #getFile()
 * @see #getPath()
 * @see #getRawPath()
 */
@API(status = STABLE, since = "1.0")
public class FileSelector implements DiscoverySelector {

	private final String path;
	private final FilePosition position;

	FileSelector(String path, FilePosition position) {
		this.path = path;
		this.position = position;
	}

	/**
	 * Get the selected file as a {@link java.io.File}.
	 *
	 * @see #getPath()
	 * @see #getRawPath()
	 */
	public File getFile() {
		return new File(this.path);
	}

	/**
	 * Get the selected file as a {@link java.nio.file.Path} using the
	 * {@linkplain FileSystems#getDefault default} {@link FileSystem}.
	 *
	 * @see #getFile()
	 * @see #getRawPath()
	 */
	public Path getPath() {
		return Paths.get(this.path);
	}

	/**
	 * Get the selected file as a <em>raw path</em>.
	 *
	 * @see #getFile()
	 * @see #getPath()
	 */
	public String getRawPath() {
		return this.path;
	}

	/**
	 * Get the selected position within the file as a {@link FilePosition}.
	 */
	public Optional<FilePosition> getPosition() {
		return Optional.ofNullable(this.position);
	}

	/**
	 * @since 1.3
	 */
	@API(status = STABLE, since = "1.3")
	@Override
	public boolean equals(Object o) {
		if (this == o) {
			return true;
		}
		if (o == null || getClass() != o.getClass()) {
			return false;
		}
		FileSelector that = (FileSelector) o;
		return Objects.equals(this.path, that.path) && Objects.equals(this.position, that.position);
	}

	/**
	 * @since 1.3
	 */
	@API(status = STABLE, since = "1.3")
	@Override
	public int hashCode() {
		return Objects.hash(path, position);
	}

	@Override
	public String toString() {
		return new ToStringBuilder(this).append("path", this.path).append("position", this.position).toString();
	}

}
