/*
 * This file is part of LanternServer, licensed under the MIT License (MIT).
 *
 * Copyright (c) LanternPowered <https://www.lanternpowered.org>
 * Copyright (c) SpongePowered <https://www.spongepowered.org>
 * Copyright (c) contributors
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the Software), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
package org.lanternpowered.server.console.launch;

import static com.google.common.base.Preconditions.checkNotNull;

import org.apache.logging.log4j.Level;
import org.apache.logging.log4j.Logger;

import java.io.ByteArrayOutputStream;
import java.io.IOException;

final class LoggingOutputStream extends ByteArrayOutputStream {

    private static final String SEPARATOR = System.getProperty("line.separator");

    private final Logger logger;
    private final Level level;

    boolean flush = true;

    LoggingOutputStream(Logger logger, Level level) {
        this.logger = checkNotNull(logger, "logger");
        this.level = checkNotNull(level, "level");
    }

    @Override
    public void flush() throws IOException {
        if (!this.flush) {
            return;
        }

        String message = this.toString();
        this.reset();

        if (this.logger.isEnabled(this.level) && !message.isEmpty() && !message.equals(SEPARATOR)) {
            if (message.endsWith(SEPARATOR)) {
                message = message.substring(0, message.length() - SEPARATOR.length());
            }

            if (message.charAt(message.length() - 1) == '\n') {
                message = message.substring(0, message.length() - 1);
            }

            this.logger.log(this.level, message);
        }
    }

}