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// Copyright 2015-2018 The NATS Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at:
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package io.nats.client.impl;

import io.nats.client.support.DateTimeUtils;
import java.time.ZonedDateTime;

/**
 * Jetstream meta data about a message, when applicable.
 */
public class NatsJetStreamMetaData {

    private final String prefix;
    private final String domain;
    private final String accountHash;
    private final String stream;
    private final String consumer;
    private final long delivered;
    private final long streamSeq;
    private final long consumerSeq;
    private final ZonedDateTime timestamp;
    private final long pending;
    @Override
    public String toString() {
        return "NatsJetStreamMetaData{" +
            "prefix='" + prefix + '\'' +
            ", domain='" + domain + '\'' +
            ", stream='" + stream + '\'' +
            ", consumer='" + consumer + '\'' +
            ", delivered=" + delivered +
            ", streamSeq=" + streamSeq +
            ", consumerSeq=" + consumerSeq +
            ", timestamp=" + timestamp +
            ", pending=" + pending +
            '}';
    }


    /*
    v0 .ACK......
    v1 .ACK.......
    v2 .ACK.........
     */

    public NatsJetStreamMetaData(NatsMessage natsMessage) {
        if (!natsMessage.isJetStream()) {
            throw new IllegalArgumentException(notAJetStreamMessage(natsMessage.getReplyTo()));
        }

        String[] parts = natsMessage.getReplyTo().split("\\.");
        if (parts.length < 8 || !"ACK".equals(parts[1])) {
            throw new IllegalArgumentException(notAJetStreamMessage(natsMessage.getReplyTo()));
        }

        int streamIndex;
        boolean hasPending;
        boolean hasDomainAndHash;
        if (parts.length == 8) {
            streamIndex = 2;
            hasPending = false;
            hasDomainAndHash = false;
        }
        else if (parts.length == 9) {
            streamIndex = 2;
            hasPending = true;
            hasDomainAndHash = false;
        }
        else if (parts.length >= 11) {
            streamIndex = 4;
            hasPending = true;
            hasDomainAndHash = true;
        }
        else {
            throw new IllegalArgumentException(notAJetStreamMessage(natsMessage.getReplyTo()));
        }

        try {
            prefix = parts[0];
            // "ack" = parts[1]
            domain = hasDomainAndHash ? parts[2] : null;
            accountHash = hasDomainAndHash ? parts[3] : null;
            stream = parts[streamIndex];
            consumer = parts[streamIndex + 1];
            delivered = Long.parseLong(parts[streamIndex + 2]);
            streamSeq = Long.parseLong(parts[streamIndex + 3]);
            consumerSeq = Long.parseLong(parts[streamIndex + 4]);
            timestamp = DateTimeUtils.parseDateTimeNanos(parts[streamIndex + 5]);
            pending = hasPending ? Long.parseLong(parts[streamIndex + 6]) : -1L;
        }
        catch (Exception e) {
            throw new IllegalArgumentException(notAJetStreamMessage(natsMessage.getReplyTo()));
        }
    }

    /**
     * Get the domain for the message. Might be null
     * @return the domain
     */
    public String getDomain() {
        return domain;
    }

    /**
     * Gets the stream the message is from.
     *
     * @return the stream.
     */
    public String getStream() {
        return stream;
    }

    /**
     * Gets the consumer that generated this message.
     *
     * @return the consumer.
     */
    public String getConsumer() {
        return consumer;
    }

    /**
     * Gets the number of times this message has been delivered.
     *
     * @return delivered count.
     */
    public long deliveredCount() {
        return delivered;
    }

    /**
     * Gets the stream sequence number of the message.
     *
     * @return sequence number
     */
    public long streamSequence() {
        return streamSeq;
    }

    /**
     * Gets consumer sequence number of this message.
     *
     * @return sequence number
     */
    public long consumerSequence() {
        return consumerSeq;
    }

    /**
     * Gets the pending count of the consumer.
     *
     * @return pending count
     */
    public long pendingCount() {
        return pending;
    }

    /**
     * Gets the timestamp of the message.
     *
     * @return the timestamp
     */
    public ZonedDateTime timestamp() {
        return timestamp;
    }

    String getAccountHash() {
        return accountHash;
    }

    private String notAJetStreamMessage(String reply) {
        return "Message is not a JetStream message.  ReplySubject: <" + reply + ">";
    }
}