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package com.eightkdata.mongowp.mongoserver.pojos;

import com.google.common.primitives.UnsignedInteger;
import com.google.common.primitives.UnsignedInts;
import java.io.Serializable;
import org.bson.BsonTimestamp;
import org.threeten.bp.Instant;

/**
 * OpTime encompasses an Instant and a 64-bit Term
 * number. OpTime can be used to label every op in an oplog with a unique
 * identifier.
 */
public class OpTime implements Comparable, Serializable {

    public static final OpTime EPOCH = new OpTime(0, 0);
    private static final long serialVersionUID = 1L;

    private final int secs;
    private final int term;

    public OpTime(Instant instant) {
        this.secs = UnsignedInteger.valueOf(instant.getEpochSecond()).intValue();
        this.term = UnsignedInteger.valueOf(instant.getNano()).intValue();
    }

    public OpTime(Instant instant, UnsignedInteger term) {
        this.secs = UnsignedInteger.valueOf(instant.getEpochSecond()).intValue();
        this.term = term.intValue();
    }

    public OpTime(UnsignedInteger secs, UnsignedInteger term) {
        this.secs = secs.intValue();
        this.term = term.intValue();
    }

    /**
     *
     * @param secs secs since epoch, used as an unsigned int!
     * @param term arbitrary ordinal value, used as an unsigned int
     */
    public OpTime(int secs, int term) {
        this.secs = secs;
        this.term = term;
    }

    public UnsignedInteger getSecs() {
        return UnsignedInteger.fromIntBits(secs);
    }
    
    public UnsignedInteger getTerm() {
        return UnsignedInteger.fromIntBits(term);
    }

    public BsonTimestamp asBsonTimestamp() {
        return new BsonTimestamp(secs, term);
    }

    public long toEpochMilli() {
        return UnsignedInts.toLong(secs) * 1000;
    }

    @Override
    public int hashCode() {
        int hash = 3;
        hash = 59 * hash + this.secs;
        hash = 59 * hash + this.term;
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final OpTime other = (OpTime) obj;
        if (this.secs != other.secs) {
            return false;
        }
        if (this.term != other.term) {
            return false;
        }
        return true;
    }

    @Override
    public int compareTo(OpTime o) {
        int diff = UnsignedInts.compare(secs, o.secs);
        if (diff != 0) {
            return diff;
        }
        return UnsignedInts.compare(term, o.term);
    }

    @Override
    public String toString() {
        return "{t: " + UnsignedInteger.fromIntBits(secs) + ", i: "+ UnsignedInteger.fromIntBits(term) + "}";
    }
}