using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using System.Diagnostics;
using TakeoutSaaS.Shared.Abstractions.Diagnostics;

namespace TakeoutSaaS.Shared.Web.Middleware;

/// <summary>
/// 基础请求日志（方法、路径、耗时、状态码、TraceId）。
/// </summary>
public sealed class RequestLoggingMiddleware(RequestDelegate next, ILogger<RequestLoggingMiddleware> logger)
{
    /// <summary>
    /// 记录请求日志并调用后续中间件。
    /// </summary>
    /// <param name="context">HTTP 上下文。</param>
    public async Task InvokeAsync(HttpContext context)
    {
        // 1. 启动计时
        var stopwatch = Stopwatch.StartNew();
        try
        {
            await next(context);
        }
        finally
        {
            // 2. 结束计时并输出日志
            stopwatch.Stop();
            var traceId = TraceContext.TraceId ?? context.TraceIdentifier;
            var spanId = TraceContext.SpanId ?? Activity.Current?.SpanId.ToString() ?? string.Empty;
            logger.LogInformation(
                "HTTP {Method} {Path} => {StatusCode} ({Elapsed} ms) TraceId:{TraceId} SpanId:{SpanId}",
                context.Request.Method,
                context.Request.Path,
                context.Response.StatusCode,
                stopwatch.Elapsed.TotalMilliseconds,
                traceId,
                spanId);
        }
    }
}