﻿/*
 * 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 DotPulsar.Extensions;
using DotPulsar.Internal.Extensions;
using System.Collections.Generic;
using System.Diagnostics;

public static class DotPulsarActivitySource
{
    static DotPulsarActivitySource()
    {
        ActivitySource = new(Constants.ClientName, Constants.ClientVersion);
    }

    public static ActivitySource ActivitySource { get; }

    public static Activity? StartConsumerActivity(IMessage message, string operationName, KeyValuePair<string, object?>[] tags)
    {
        if (!ActivitySource.HasListeners())
            return null;

        return StartActivity(operationName, ActivityKind.Consumer, tags, message.GetConversationId());
    }

    public static Activity? StartProducerActivity(MessageMetadata metadata, string operationName, KeyValuePair<string, object?>[] tags)
    {
        if (!ActivitySource.HasListeners())
            return null;

        return StartActivity(operationName, ActivityKind.Producer, tags, metadata.GetConversationId());
    }

    private static Activity? StartActivity(string operationName, ActivityKind kind, KeyValuePair<string, object?>[] tags, string? conversationId)
    {
        var activity = ActivitySource.StartActivity(operationName, kind);

        if (activity is not null && activity.IsAllDataRequested)
        {
            for (var i = 0; i < tags.Length; ++i)
            {
                var tag = tags[i];
                activity.SetTag(tag.Key, tag.Value);
            }

            if (conversationId is not null)
                activity.SetConversationId(conversationId);
        }

        return activity;
    }
}