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/**
 * Copyright (c) 2013, impossibl.com
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  * Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *  * Neither the name of impossibl.com nor the names of its contributors may
 *    be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package com.impossibl.postgres.protocol.v30;

import com.impossibl.postgres.protocol.FieldFormat;
import com.impossibl.postgres.protocol.FieldFormatRef;
import com.impossibl.postgres.protocol.Notice;
import com.impossibl.postgres.protocol.RequestExecutor.ExtendedQueryHandler;
import com.impossibl.postgres.protocol.ResultField;
import com.impossibl.postgres.protocol.RowDataSet;
import com.impossibl.postgres.protocol.TransactionStatus;
import com.impossibl.postgres.protocol.TypeRef;
import com.impossibl.postgres.protocol.v30.ProtocolHandler.CommandComplete;
import com.impossibl.postgres.protocol.v30.ProtocolHandler.CommandError;
import com.impossibl.postgres.protocol.v30.ProtocolHandler.DataRow;
import com.impossibl.postgres.protocol.v30.ProtocolHandler.EmptyQuery;
import com.impossibl.postgres.protocol.v30.ProtocolHandler.NoData;
import com.impossibl.postgres.protocol.v30.ProtocolHandler.PortalSuspended;
import com.impossibl.postgres.protocol.v30.ProtocolHandler.ReadyForQuery;
import com.impossibl.postgres.protocol.v30.ProtocolHandler.ReportNotice;
import com.impossibl.postgres.protocol.v30.ProtocolHandler.RowDescription;
import com.impossibl.postgres.system.NoticeException;

import static com.impossibl.postgres.protocol.FieldFormats.REQUEST_ALL_TEXT;
import static com.impossibl.postgres.protocol.ServerObjectType.Portal;
import static com.impossibl.postgres.system.Empty.EMPTY_FIELDS;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import static java.lang.Integer.min;

import io.netty.buffer.ByteBuf;

import static io.netty.util.ReferenceCountUtil.release;


class ExecutePortalRequest implements ServerRequest {

  private String portalName;
  private int maxRows;
  private ExtendedQueryHandler handler;
  private ResultField[] describedResultFields;
  private RowDataSet rows;
  private List notices;

  ExecutePortalRequest(String portalName, int maxRows, ExtendedQueryHandler handler) {
    this.portalName = portalName;
    this.maxRows = maxRows;
    this.handler = handler;
    this.describedResultFields = EMPTY_FIELDS;
    this.rows = new RowDataSet();
    this.notices = new ArrayList<>();
  }

  private boolean isSynchronized() {
    return maxRows == 0;
  }

  private class Handler implements RowDescription, NoData, DataRow, EmptyQuery, PortalSuspended, CommandComplete, ReportNotice, CommandError, ReadyForQuery {

    @Override
    public String toString() {
      return "Execute Portal";
    }

    @Override
    public Action notice(Notice notice) {
      notices.add(notice);
      return Action.Resume;
    }

    @Override
    public Action rowDescription(ResultField[] fields) {
      describedResultFields = fields;

      // Fix formats to match what was sent in the execute request

      FieldFormatRef[] effectiveFormats = REQUEST_ALL_TEXT;

      for (int idx = 0; idx < describedResultFields.length; ++idx) {
        FieldFormat format = effectiveFormats[min(idx, effectiveFormats.length - 1)].getFormat();
        describedResultFields[idx].setFormat(format);
      }


      return Action.Resume;
    }

    @Override
    public Action rowData(ByteBuf data) {
      rows.add(new BufferRowData(data.retain()));
      return Action.Resume;
    }

    @Override
    public Action noData() {
      return Action.Resume;
    }

    @Override
    public Action portalSuspended() throws IOException {

      try {
        handler.handleSuspend(new TypeRef[0], describedResultFields, rows, notices);
      }
      finally {
        release(rows);
      }

      return Action.Complete;
    }

    @Override
    public Action emptyQuery() throws IOException {
      return commandComplete(null, null, null);
    }

    @Override
    public Action commandComplete(String command, Long rowsAffected, Long insertedOid) throws IOException {

      try {
        handler.handleComplete(command, rowsAffected, insertedOid, new TypeRef[0], describedResultFields, rows, notices);
      }
      finally {
        release(rows);
      }

      return isSynchronized() ? Action.Resume : Action.Complete;
    }

    @Override
    public Action error(Notice error) throws IOException {

      try {
        handler.handleError(new NoticeException(error), notices);
      }
      finally {
        release(rows);
      }

      return isSynchronized() ? Action.Resume : Action.Complete;
    }

    @Override
    public Action readyForQuery(TransactionStatus txnStatus) throws IOException {
      handler.handleReady(txnStatus);
      return Action.Complete;
    }

    @Override
    public void exception(Throwable cause) throws IOException {

      try {
        handler.handleError(cause, notices);
      }
      finally {
        release(rows);
      }
    }

  }

  @Override
  public ProtocolHandler createHandler() {
    return new Handler();
  }

  @Override
  public void execute(ProtocolChannel channel) throws IOException {

    channel
        .writeDescribe(Portal, portalName)
        .writeExecute(portalName, maxRows);

    if (!isSynchronized()) {
      channel.writeFlush();
    }
    else {
      channel.writeSync();
    }

    channel.flush();

  }

}