﻿/*
 * 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 Abstractions;
using Events;
using System;
using System.Collections.Concurrent;
using System.Linq;
using System.Threading.Tasks;

public sealed class ProcessManager : IRegisterEvent, IAsyncDisposable
{
    private readonly ConcurrentDictionary<Guid, IProcess> _processes;
    private readonly IConnectionPool _connectionPool;

    public ProcessManager(IConnectionPool connectionPool)
    {
        _processes = new ConcurrentDictionary<Guid, IProcess>();
        _connectionPool = connectionPool;
    }

    public async ValueTask DisposeAsync()
    {
        foreach (var proc in _processes.Values.ToArray())
            await proc.DisposeAsync().ConfigureAwait(false);

        await _connectionPool.DisposeAsync().ConfigureAwait(false);
    }

    public void Add(IProcess process)
        => _processes[process.CorrelationId] = process;

    private async void Remove(Guid correlationId)
    {
        if (_processes.TryRemove(correlationId, out var process))
            await process.DisposeAsync().ConfigureAwait(false);
    }

    public void Register(IEvent e)
    {
        switch (e)
        {
            case ConsumerCreated _:
                DotPulsarMeter.ConsumerCreated();
                break;
            case ConsumerDisposed consumerDisposed:
                Remove(consumerDisposed.CorrelationId);
                DotPulsarMeter.ConsumerDisposed();
                break;
            case ProducerCreated _:
                DotPulsarMeter.ProducerCreated();
                break;
            case ProducerDisposed producerDisposed:
                Remove(producerDisposed.CorrelationId);
                DotPulsarMeter.ProducerDisposed();
                break;
            case ReaderCreated _:
                DotPulsarMeter.ReaderCreated();
                break;
            case ReaderDisposed readerDisposed:
                Remove(readerDisposed.CorrelationId);
                DotPulsarMeter.ReaderDisposed();
                break;
            default:
                if (_processes.TryGetValue(e.CorrelationId, out var process))
                    process.Handle(e);
                break;
        }
    }
}