﻿/*
 * 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.Internal;

using DotPulsar.Abstractions;
using System;
using System.Buffers;
using System.Collections.Generic;

public sealed class Message<TValue> : IMessage<TValue>
{
    private readonly ISchema<TValue> _schema;

    internal Message(
        MessageId messageId,
        ReadOnlySequence<byte> data,
        string producerName,
        ulong sequenceId,
        uint redeliveryCount,
        ulong eventTime,
        ulong publishTime,
        IReadOnlyDictionary<string, string> properties,
        bool hasBase64EncodedKey,
        string? key,
        byte[]? orderingKey,
        byte[]? schemaVersion,
        ISchema<TValue> schema)
    {
        MessageId = messageId;
        Data = data;
        ProducerName = producerName;
        SequenceId = sequenceId;
        RedeliveryCount = redeliveryCount;
        EventTime = eventTime;
        PublishTime = publishTime;
        Properties = properties;
        HasBase64EncodedKey = hasBase64EncodedKey;
        Key = key;
        OrderingKey = orderingKey;
        SchemaVersion = schemaVersion;
        _schema = schema;
    }

    public MessageId MessageId { get; }

    public ReadOnlySequence<byte> Data { get; }

    public string ProducerName { get; }

    public byte[]? SchemaVersion { get; }

    public ulong SequenceId { get; }

    public uint RedeliveryCount { get; }

    public bool HasEventTime => EventTime != 0;

    public ulong EventTime { get; }

    public DateTime EventTimeAsDateTime => EventTimeAsDateTimeOffset.UtcDateTime;

    public DateTimeOffset EventTimeAsDateTimeOffset => DateTimeOffset.FromUnixTimeMilliseconds((long) EventTime);

    public bool HasBase64EncodedKey { get; }

    public bool HasKey => Key is not null;

    public string? Key { get; }

    public byte[]? KeyBytes => Key is not null ? Convert.FromBase64String(Key) : null;

    public bool HasOrderingKey => OrderingKey is not null;

    public byte[]? OrderingKey { get; }

    public ulong PublishTime { get; }

    public DateTime PublishTimeAsDateTime => PublishTimeAsDateTimeOffset.UtcDateTime;

    public DateTimeOffset PublishTimeAsDateTimeOffset => DateTimeOffset.FromUnixTimeMilliseconds((long) PublishTime);

    public IReadOnlyDictionary<string, string> Properties { get; }

    public TValue Value() => _schema.Decode(Data);
}