using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using AopAlliance.Intercept;
using System.Threading;
using HeuristicLab.Hive.Server.LINQDataAccess;
using System.Transactions;
using HeuristicLab.Hive.Contracts;
using HeuristicLab.Tracing;
using System.Reflection;
using HeuristicLab.Hive.Server.Core;

namespace HeuristicLab.Hive.Server {
  internal class ServiceCallInterception : IMethodInterceptor {
    private const bool UseTransactions = true;

    public object Invoke(IMethodInvocation invocation) {
      bool userTransaction = false;

      DateTime start = DateTime.Now;
      Logger.Info("Entering Method: " + invocation.Method.Name);

      if (!ContextFactory.IsContextNull()) {
        Logger.Info("Not null context found - why wasn't this disposed?");
        try {
          Logger.Info("Trying to dispose");
          ContextFactory.Context.Dispose();
        }
        catch (Exception e) {
          Logger.Error(e);
        }
        ContextFactory.Context = null;
      }
      Logger.Info("Context info: Timeout: " + ContextFactory.Context.Connection.ConnectionTimeout + " | " +
                  ContextFactory.Context.Connection.State + " | Conn: " + ContextFactory.Context + " | HashCode is: " +
                  ContextFactory.Context.Connection.GetHashCode());
      Object obj = null;

      Object[] attributes = invocation.Method.GetCustomAttributes(typeof(SpringTransaction), true);
      foreach (Object o in attributes) {
        SpringTransaction st = (SpringTransaction)o;
        userTransaction = st.UserTransaction;
      }
      if (UseTransactions && !userTransaction) {
        using (
          TransactionScope scope = new TransactionScope(TransactionScopeOption.Required, new TransactionOptions { IsolationLevel = ApplicationConstants.ISOLATION_LEVEL_SCOPE })) {
          try {
            Logger.Debug("Current Transaction Isolation level is: " + Transaction.Current.IsolationLevel);
            obj = invocation.Proceed();
            scope.Complete();
          }
          catch (Exception e) {
            Logger.Error("Exception occured during method invocation", e);
            Logger.Error("Inner Exception: ", e.InnerException);
          }
          finally {
            ContextFactory.Context.Dispose();
            Logger.Debug("Disposed Context");
            ContextFactory.Context = null;
            Logger.Debug("Set Context Null");
          }
        }
      } else {
        try {
          obj = invocation.Proceed();
        }
        catch (Exception e) {
          Logger.Error("Exception occured during method invocation", e);
        }
        finally {
          ContextFactory.Context.Dispose();
          Logger.Debug("Disposed Context");
          ContextFactory.Context = null;
          Logger.Debug("Set Context Null");
        }
      }
   
      TimeSpan ts = DateTime.Now - start;
      if (ts.Seconds > 2) {
        Logger.Warn("Invocation took: " + ts);
      } else if (ts.Seconds > 10) {
        Logger.Error("Invocation took: " + ts);
      } else {
        Logger.Info("Invocation took: " + ts);
        ;
      }
      Logger.Info("Leaving Method: " + invocation.Method.Name);

      return obj;
    }
  }
}