using Microsoft.ApplicationInsights.Channel;
using Microsoft.ApplicationInsights.DataContracts;
using Microsoft.ApplicationInsights.Extensibility;

namespace gehGassi.Web.Helper
{
    /// <summary>
    /// Ausfiltern von unerwünschten Events des Azure-Storage und SignalR für Application-Insights
    /// </summary>
    public class ApplicationInsightsTelemetryProcessor : ITelemetryProcessor
    {
        private ITelemetryProcessor Next { get; set; }

        public ApplicationInsightsTelemetryProcessor(ITelemetryProcessor next)
        {
            Next = next;
        }

        public void Process(ITelemetry item)
        {
            if (item is RequestTelemetry request && !string.IsNullOrWhiteSpace(request.Name))
            {
                var requestName = request.Name.ToLower();

                if (requestName.Contains("signalr"))
                    return;
                if (requestName.Contains("negotiate"))
                    return;
                if ((requestName.StartsWith("get api") || requestName.StartsWith("post api")) && requestName.Contains("/"))
                {
                    if (!VerifyRequestIsValid(item))
                        return;
                }
            }

            if (!VerifyDepdendencyIsValid(item))
                return;

            Next.Process(item);
        }

        private bool VerifyDepdendencyIsValid(ITelemetry item)
        {
            var dependency = item as DependencyTelemetry;


            if (dependency == null)
                return true;

            //Filter
            if (dependency.Success == false)
            {
                if (dependency.ResultCode is "409" or "404")
                    dependency.Success = true;
                if (dependency.Type.ToLower() == "azure blob" && dependency.ResultCode is "409" or "404")
                    dependency.Success = true;
                if (dependency.Type.ToLower() == "http" && dependency.ResultCode is "409")
                    dependency.Success = true;
                if (dependency.Type.ToLower() == "inproc | microsoft.storage" && dependency.Name == "BlobContainerClient.Create")
                    dependency.Success = true;
                if (dependency.Type.ToLower() == "inproc | microsoft.storage" && dependency.Name == "ShareClient.CreateIfNotExists")
                    dependency.Success = true;
            }

            return dependency.Success != true;
        }

        private bool VerifyRequestIsValid(ITelemetry item)
        {
            var request = item as RequestTelemetry;

            if (request == null)
                return true;

            //Filter
            if (request.Success == false)
            {
                if (request.ResponseCode is "400" or "401" or "404")
                    request.Success = true;
            }
            return request.Success != true;
        }
    }
}