/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 org.apache.maven.surefire.api.util;

import java.io.File;
import java.util.Objects;
import java.util.stream.Stream;

/**
 * Centralized file management of temporary files in surefire.<br>
 * Files are deleted on VM exit.
 *
 * @author Markus Spann
 */
public final class SureFireFileManager {

    private static TempFileManager instance = create();

    private static TempFileManager create() {
        String subDirName = "surefire";

        // create directory name suffix from legal chars in the current user name
        // or a timestamp with millisecond resolution as fallback
        String userSuffix = Stream.of("user.name", "USER", "USERNAME")
                .map(System::getProperty)
                .filter(Objects::nonNull)
                .findFirst()
                .map(u -> u.replaceAll("[^A-Za-z0-9\\-_]", ""))
                .map(u -> u.isEmpty() ? null : u)
                .orElse(Long.toString(System.currentTimeMillis()));

        if (userSuffix != null) {
            subDirName += "-" + userSuffix;
        }

        TempFileManager tfm = TempFileManager.instance(subDirName);
        tfm.setDeleteOnExit(true);
        return tfm;
    }

    public static File createTempFile(String prefix, String suffix) {
        return instance.createTempFile(prefix, suffix);
    }
}
