// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
#if NET9_0_OR_GREATER
 
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Diagnostics.Buffering;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
 
namespace Microsoft.AspNetCore.Diagnostics.Buffering;
 
internal sealed class PerRequestLogBufferManager : PerRequestLogBuffer
{
    internal readonly IOptionsMonitor<PerRequestLogBufferingOptions> Options;
 
    private readonly GlobalLogBuffer _globalBuffer;
    private readonly IHttpContextAccessor _httpContextAccessor;
    private readonly LogBufferingFilterRuleSelector _ruleSelector;
 
    public PerRequestLogBufferManager(
        GlobalLogBuffer globalBuffer,
        IHttpContextAccessor httpContextAccessor,
        LogBufferingFilterRuleSelector ruleSelector,
        IOptionsMonitor<PerRequestLogBufferingOptions> options)
    {
        _globalBuffer = globalBuffer;
        _httpContextAccessor = httpContextAccessor;
        _ruleSelector = ruleSelector;
        Options = options;
    }
 
    public override void Flush()
    {
        _httpContextAccessor.HttpContext?.RequestServices.GetService<IncomingRequestLogBufferHolder>()?.Flush();
        _globalBuffer.Flush();
    }
 
    public override bool TryEnqueue<TState>(IBufferedLogger bufferedLogger, in LogEntry<TState> logEntry)
    {
        HttpContext? httpContext = _httpContextAccessor.HttpContext;
        if (httpContext is null)
        {
            return _globalBuffer.TryEnqueue(bufferedLogger, logEntry);
        }
 
        string category = logEntry.Category;
        IncomingRequestLogBufferHolder? bufferHolder =
            httpContext.RequestServices.GetService<IncomingRequestLogBufferHolder>();
        IncomingRequestLogBuffer? buffer = bufferHolder?.GetOrAdd(category, _ =>
            new IncomingRequestLogBuffer(bufferedLogger, category, _ruleSelector, Options));
 
        if (buffer is null)
        {
            return _globalBuffer.TryEnqueue(bufferedLogger, logEntry);
        }
 
        return buffer.TryEnqueue(logEntry);
    }
}
#endif