﻿/*
 * 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.
 */

namespace DotPulsar.Abstractions;

using System;
using System.Buffers;
using System.Collections.Generic;

/// <summary>
/// A message abstraction.
/// </summary>
public interface IMessage
{
    /// <summary>
    /// The id of the message.
    /// </summary>
    MessageId MessageId { get; }

    /// <summary>
    /// The raw payload of the message.
    /// </summary>
    ReadOnlySequence<byte> Data { get; }

    /// <summary>
    /// The name of the producer who produced the message.
    /// </summary>
    string ProducerName { get; }

    /// <summary>
    /// The schema version of the message.
    /// </summary>
    byte[]? SchemaVersion { get; }

    /// <summary>
    /// The sequence id of the message.
    /// </summary>
    ulong SequenceId { get; }

    /// <summary>
    /// The redelivery count (maintained by the broker) of the message.
    /// </summary>
    uint RedeliveryCount { get; }

    /// <summary>
    /// Check whether the message has an event time.
    /// </summary>
    bool HasEventTime { get; }

    /// <summary>
    /// The event time of the message as unix time in milliseconds.
    /// </summary>
    ulong EventTime { get; }

    /// <summary>
    /// The event time of the message as an UTC DateTime.
    /// </summary>
    public DateTime EventTimeAsDateTime { get; }

    /// <summary>
    /// The event time of the message as a DateTimeOffset with an offset of 0.
    /// </summary>
    public DateTimeOffset EventTimeAsDateTimeOffset { get; }

    /// <summary>
    /// Check whether the key been base64 encoded.
    /// </summary>
    bool HasBase64EncodedKey { get; }

    /// <summary>
    /// Check whether the message has a key.
    /// </summary>
    bool HasKey { get; }

    /// <summary>
    /// The key as a string.
    /// </summary>
    string? Key { get; }

    /// <summary>
    /// The key as bytes.
    /// </summary>
    byte[]? KeyBytes { get; }

    /// <summary>
    /// Check whether the message has an ordering key.
    /// </summary>
    bool HasOrderingKey { get; }

    /// <summary>
    /// The ordering key of the message.
    /// </summary>
    byte[]? OrderingKey { get; }

    /// <summary>
    /// The publish time of the message as unix time in milliseconds.
    /// </summary>
    ulong PublishTime { get; }

    /// <summary>
    /// The publish time of the message as an UTC DateTime.
    /// </summary>
    public DateTime PublishTimeAsDateTime { get; }

    /// <summary>
    /// The publish time of the message as a DateTimeOffset with an offset of 0.
    /// </summary>
    public DateTimeOffset PublishTimeAsDateTimeOffset { get; }

    /// <summary>
    /// The properties of the message.
    /// </summary>
    public IReadOnlyDictionary<string, string> Properties { get; }
}