using System.Diagnostics.Metrics;

namespace YarpGateway.Metrics;

public class GatewayMetrics
{
    private readonly Counter<int> _requestsTotal;
    private readonly Histogram<double> _requestDuration;

    public GatewayMetrics(IMeterFactory meterFactory)
    {
        var meter = meterFactory.Create("fengling.gateway");
        _requestsTotal = meter.CreateCounter<int>(
            "gateway_requests_total",
            "Total number of requests");
        _requestDuration = meter.CreateHistogram<double>(
            "gateway_request_duration_seconds",
            "Request duration in seconds");
    }

    public void RecordRequest(string tenant, string service, int statusCode, double duration)
    {
        var tag = new KeyValuePair<string, object?>("tenant", tenant);
        var tag2 = new KeyValuePair<string, object?>("service", service);
        var tag3 = new KeyValuePair<string, object?>("status", statusCode.ToString());

        _requestsTotal.Add(1, tag, tag2, tag3);
        _requestDuration.Record(duration, tag, tag2);
    }
}