using System;
using System.Collections;
using System.Reflection;

using BCG.Utilities;

namespace BCG {
   // if a table needs to be fired, it can be wrapped around this
   public class BlueTableStream : ViewStream {
      private IBlueRowCollection _rows;
      public BlueTableStream(IBlueRowCollection rows) {
         _rows = rows;
      }

      protected override void myOnFirstSubscriber() {
         var dp_out = BlueDataUtility.build_dp_inc(_rows, myLastValue as DataPacket);
         myFireEvent(dp_out);
      }
   }

   [DataStreamUserRespresentation(false)]
   public class BlueRowCollectionStaticStream : ViewStream {
      public BlueRowCollectionStaticStream() { }

      public BlueRowCollectionStaticStream(IBlueRowCollection rows) { loadCollection(rows); }

      public void loadCollection(IBlueRowCollection rows) {
         myFireEvent(new DataPacket(rows, rows, myLastValue != null ?
                                                   new BlueTable((myLastValue as DataPacket).newRows) : new BlueTable(rows.schema)));
      }

      public void crush_with_single_row(IBlueRow r) {
         BlueTable t = new BlueTable(r.schema);
         t.addRow(r);
         loadCollection(t);
      }

      public void loadPacket(DataPacket dp) { myFireEvent(dp); }

      /// <summary>
      /// Will work with streams that take ViewStream as first argument ex project, filter, distinct etc
      /// The other arguments are provided by the user.
      /// </summary>
      /// <param name="rows"></param>
      /// <param name="streamType"></param>
      /// <param name="args"></param>
      /// <returns></returns>
      public static IBlueRowCollection statelessOp(IBlueRowCollection rows, Type streamType, params object[] args) {
         ArrayList totArgs = new ArrayList(args);
         BlueRowCollectionStaticStream v1 = new BlueRowCollectionStaticStream();
         totArgs.Insert(0, v1);
         ViewStream retVal = Activator.CreateInstance(streamType, totArgs.ToArray()) as ViewStream;
         v1.loadCollection(rows);
         return retVal.rows;
      }

   }


}