using System;
using System.Collections.Generic;
using System.Configuration;
using System.Linq;
using System.ServiceModel.Channels;
using System.ServiceModel.Dispatcher;
using System.ServiceModel;
using System.Text;
using System.Threading.Tasks;
using BeWo.Data;
using BeWo.Service.Attributes;
using BeWo.Service.Core;
using System.Runtime.Remoting.Channels;
using DevExpress.PivotGrid.OLAP;
using BeWo.Service.ServiceUtils;

namespace BeWo.Service.ServiceBehavior
{
	public class AdminServiceMessageInspector : IDispatchMessageInspector
	{
		public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
		{
			ValidateIP(ref request, channel);

			ValidateApiKey(ref request, channel);

			return null; // Keine Zustandsinformationen erforderlich
		}

		public void BeforeSendReply(ref Message reply, object correlationState)
		{
			// Keine zusätzliche Logik erforderlich vor dem Senden der Antwort
		}

		public void ValidateIP(ref Message request, IClientChannel channel)
		{
			var (inter, method) = ServiceHelper.GetInterfaceAndMethodASP(request, channel);

			var attr = ServiceHelper.GetCustomAttribute<RequireIPAddressAttribute>(inter, method);

			if (attr is null)
				return;

			// Extrahiere die RemoteEndpoint-IP-Adresse
			string remoteIP = request.Properties.ContainsKey(RemoteEndpointMessageProperty.Name)
				? ((RemoteEndpointMessageProperty)request.Properties[RemoteEndpointMessageProperty.Name]).Address
				: null;

			if (remoteIP == null)
			{
				throw new UnauthorizedAccessException($"Zugriff verweigert. Remote IP ({remoteIP ?? "Unbekannt"}) ist nicht erlaubt.");
			}

			var ipList = attr.IPAddressList;
			var allowedIPs = ConfigReader.GetIPAddressList(ipList);

			if(allowedIPs is null ||allowedIPs.Count == 0)
			{
				throw new UnauthorizedAccessException($"Zugriff verweigert. Konfigurationsfehler.");
			}

			if(allowedIPs.All(x => !string.Equals(remoteIP, x, StringComparison.OrdinalIgnoreCase)))
			{
				throw new UnauthorizedAccessException($"Zugriff verweigert. Remote IP ({remoteIP ?? "Unbekannt"}) ist nicht erlaubt.");
			}
		}

		public void ValidateApiKey(ref Message request, IClientChannel channel)
		{
			ValidateMethodApiKey(ref request, channel);
		}

		//public void ValidateServiceApiKey(ref Message request)
		//{
		//	//// Hole erlaubten API Key aus den appSettings
		//	//string allowedApikey = MergedConfig.GetSecretSetting(WebSecretConfigSetting.AdminServiceAPIKey);

		//	//// Extrahiert den API Key von Remote
		//	//var prop = (HttpRequestMessageProperty)request.Properties[HttpRequestMessageProperty.Name];
		//	//var remoteApikey = prop?.Headers["admin-service-api-key"];

		//	//// Vergleicht die API Keys
		//	//if (remoteApikey == null || !string.Equals(remoteApikey, allowedApikey, StringComparison.Ordinal))
		//	//{
		//	//	throw new UnauthorizedAccessException($"Zugriff verweigert. API Key ({remoteApikey ?? "Unbekannt"}) ist nicht erlaubt.");
		//	//}
		//}

		public void ValidateMethodApiKey(ref Message request, IClientChannel channel)
		{
			var (inter, method) = ServiceHelper.GetInterfaceAndMethodASP(request, channel);

			var attr = ServiceHelper.GetCustomAttribute<RequireApiKeyAttribute>(inter, method);

			if (attr is null)
				return;

			var api_key_name = attr.ApiKeyName;

			// Hole erlaubten API Key aus den appSettings
			string allowedApikey = MergedConfig.GetSecretSetting(api_key_name);

			if (string.IsNullOrEmpty(allowedApikey))
			{
				return;

				throw new UnauthorizedAccessException($"Zugriff verweigert. Api Key kann nicht geladen werden.");
			}

			// Extrahiert den API Key von Remote
			var prop = (HttpRequestMessageProperty)request.Properties[HttpRequestMessageProperty.Name];
			var remoteApikey = prop?.Headers[api_key_name.ToString()];

			// Vergleicht die API Keys
			if (remoteApikey == null || !string.Equals(remoteApikey, allowedApikey, StringComparison.Ordinal))
			{
				throw new UnauthorizedAccessException($"Zugriff verweigert. API Key ({remoteApikey ?? "Unbekannt"}) ist nicht erlaubt.");
			}
		}
	}
}