// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Logging.Testing;
 
namespace Microsoft.AspNetCore.SignalR.Tests;
 
// TestSink does not have an event
internal sealed class LogSinkProvider : ILoggerProvider
{
    private readonly ConcurrentQueue<LogRecord> _logs = new ConcurrentQueue<LogRecord>();
 
    public event Action<LogRecord> RecordLogged;
 
    public ILogger CreateLogger(string categoryName)
    {
        return new LogSinkLogger(categoryName, this);
    }
 
    public void Dispose()
    {
    }
 
    public IList<LogRecord> GetLogs() => _logs.ToList();
 
    public void Log<TState>(string categoryName, LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
    {
        var record = new LogRecord(
            DateTime.Now,
            new WriteContext
            {
                LoggerName = categoryName,
                LogLevel = logLevel,
                EventId = eventId,
                State = state,
                Exception = exception,
                Formatter = (o, e) => formatter((TState)o, e),
            });
        _logs.Enqueue(record);
 
        RecordLogged?.Invoke(record);
    }
 
    private sealed class LogSinkLogger : ILogger
    {
        private readonly string _categoryName;
        private readonly LogSinkProvider _logSinkProvider;
 
        public LogSinkLogger(string categoryName, LogSinkProvider logSinkProvider)
        {
            _categoryName = categoryName;
            _logSinkProvider = logSinkProvider;
        }
 
        public IDisposable BeginScope<TState>(TState state)
        {
            return null;
        }
 
        public bool IsEnabled(LogLevel logLevel)
        {
            return true;
        }
 
        public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter)
        {
            _logSinkProvider.Log(_categoryName, logLevel, eventId, state, exception, formatter);
        }
    }
}