/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * 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
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.configuration.helpers;

import java.time.Duration;
import java.util.Objects;
import org.neo4j.annotations.api.PublicApi;
import org.neo4j.internal.helpers.TimeUtil;

/**
 * Duration Range derived from configuration.
 * This class wraps two durations, which are non-negative and maximum is not longer than minimum.
 */
@PublicApi
public class DurationRange {
    private final Duration min;
    private final Duration max;

    public DurationRange(Duration min, Duration max) {
        this.min = min;
        this.max = max;
        if (min.toNanos() > max.toNanos()) {
            throw new IllegalArgumentException("min may not be longer than max");
        }
    }

    public static DurationRange fromSeconds(int min, int max) {
        return new DurationRange(Duration.ofSeconds(min), Duration.ofSeconds(max));
    }

    public static DurationRange parse(String value) {
        var parts = value.trim().replaceAll("^\\[", "").replaceAll("\\]$", "").split("-");
        if (parts.length != 2 || parts[0].isEmpty() || parts[1].isEmpty()) {
            throw new IllegalArgumentException(
                    "must be in format <min>-<max>, where min and max are non-negative durations");
        }
        var min = Duration.ofMillis(TimeUtil.parseTimeMillis.apply(parts[0]));
        var max = Duration.ofMillis(TimeUtil.parseTimeMillis.apply(parts[1]));
        return new DurationRange(min, max);
    }

    public Duration getMin() {
        return min;
    }

    public Duration getMax() {
        return max;
    }

    /**
     * @return returns the difference between minimum and maximum
     */
    public Duration getDelta() {
        return max.minus(min);
    }

    public String valueToString() {
        return TimeUtil.nanosToString(min.toNanos()) + '-' + TimeUtil.nanosToString(max.toNanos());
    }

    @Override
    public String toString() {
        return '[' + min.toString() + '-' + max + ']';
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        DurationRange that = (DurationRange) o;
        return min.equals(that.min) && max.equals(that.max);
    }

    @Override
    public int hashCode() {
        return Objects.hash(min, max);
    }
}
