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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog2.commands.journal;

import com.github.rvesse.airline.annotations.Command;
import com.github.rvesse.airline.annotations.Option;
import com.github.rvesse.airline.annotations.restrictions.Required;

@Command(name = "truncate", description = "Truncates the journal to a given offset")
public class JournalTruncate extends AbstractJournalCommand {

    @Option(name = {"-o", "--offset"}, description = "Truncate journal up to this offset, no remaining offset will be larger than the given offset.")
    @Required
    private long offset = Long.MIN_VALUE;

    public JournalTruncate() {
        super("truncate-journal");
    }

    @Override
    protected void runCommand() {
        try {
            final long logEndOffset = journal.getLogEndOffset();
            if (offset > logEndOffset) {
                System.err.println("Truncating journal to " + offset + " has no effect as the largest offset in the log is " + (logEndOffset - 1) + ".");
            } else {
                journal.truncateTo(offset);
            }
        } catch (IllegalArgumentException e) {
            System.err.println("Illegal offset value " + offset);
        }
    }
}