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package com.enonic.xp.node;

import java.time.Instant;

import com.enonic.xp.annotation.PublicApi;
import com.enonic.xp.context.ContextAccessor;
import com.enonic.xp.security.PrincipalKey;
import com.enonic.xp.security.User;
import com.enonic.xp.security.auth.AuthenticationInfo;

@PublicApi
public class NodeCommitEntry
    implements Comparable
{
    private final NodeCommitId nodeCommitId;

    private final String message;

    private final Instant timestamp;

    private final PrincipalKey committer;

    private NodeCommitEntry( Builder builder )
    {
        nodeCommitId = builder.nodeCommitId;
        message = builder.message == null ? "" : builder.message;
        timestamp = builder.timestamp == null ? Instant.now() : builder.timestamp;
        committer = builder.committer == null ? getCurrentUserKey() : builder.committer;
    }

    public NodeCommitId getNodeCommitId()
    {
        return nodeCommitId;
    }

    public String getMessage()
    {
        return message;
    }

    public Instant getTimestamp()
    {
        return timestamp;
    }

    public PrincipalKey getCommitter()
    {
        return committer;
    }

    @Override
    public int compareTo( final NodeCommitEntry o )
    {
        if ( this.timestamp.equals( o.timestamp ) )
        {
            return 0;
        }

        if ( this.timestamp.isBefore( o.timestamp ) )
        {
            return 1;
        }

        return -1;
    }

    private PrincipalKey getCurrentUserKey()
    {
        final AuthenticationInfo authInfo = ContextAccessor.current().getAuthInfo();
        if ( authInfo != null )
        {
            final User user = authInfo.getUser();
            if ( user != null )
            {
                return user.getKey();
            }
        }
        return PrincipalKey.ofAnonymous();
    }

    public static Builder create()
    {
        return new Builder();
    }

    public static Builder create( NodeCommitEntry nodeCommitEntry )
    {
        return new Builder( nodeCommitEntry );
    }

    public static final class Builder
    {

        private NodeCommitId nodeCommitId;

        private String message;

        private Instant timestamp;

        private PrincipalKey committer;

        private Builder()
        {
        }

        private Builder( NodeCommitEntry nodeCommitEntry )
        {
            nodeCommitId = nodeCommitEntry.nodeCommitId;
            message = nodeCommitEntry.message;
            timestamp = nodeCommitEntry.timestamp;
            committer = nodeCommitEntry.committer;
        }

        public Builder nodeCommitId( final NodeCommitId nodeCommitId )
        {
            this.nodeCommitId = nodeCommitId;
            return this;
        }

        public Builder message( final String message )
        {
            this.message = message;
            return this;
        }

        public Builder timestamp( final Instant timestamp )
        {
            this.timestamp = timestamp;
            return this;
        }

        public Builder committer( final PrincipalKey committer )
        {
            this.committer = committer;
            return this;
        }

        public NodeCommitEntry build()
        {
            return new NodeCommitEntry( this );
        }
    }

    @Override
    public boolean equals( final Object o )
    {
        if ( this == o )
        {
            return true;
        }
        if ( o == null || getClass() != o.getClass() )
        {
            return false;
        }

        final NodeCommitEntry that = (NodeCommitEntry) o;

        if ( nodeCommitId != null ? !nodeCommitId.equals( that.nodeCommitId ) : that.nodeCommitId != null )
        {
            return false;
        }
        if ( message != null ? !message.equals( that.message ) : that.message != null )
        {
            return false;
        }
        if ( timestamp != null ? !timestamp.equals( that.timestamp ) : that.timestamp != null )
        {
            return false;
        }
        return !( committer != null ? !committer.equals( that.committer ) : that.committer != null );
    }

    @Override
    public int hashCode()
    {
        int result = nodeCommitId != null ? nodeCommitId.hashCode() : 0;
        result = 31 * result + ( message != null ? message.hashCode() : 0 );
        result = 31 * result + ( timestamp != null ? timestamp.hashCode() : 0 );
        result = 31 * result + ( committer != null ? committer.hashCode() : 0 );
        return result;
    }
}