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/*
 * This file is part of Log4Jdbc.
 *
 * Log4Jdbc is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Log4Jdbc is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Log4Jdbc.  If not, see .
 *
 */
package fr.ms.log4jdbc.messagefactory;

import java.lang.reflect.Method;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;

import fr.ms.log4jdbc.invocationhandler.MessageFactory;
import fr.ms.log4jdbc.invocationhandler.MessageInvocationHandler.MessageInvocationContext;
import fr.ms.log4jdbc.invocationhandler.TimeInvocation;
import fr.ms.log4jdbc.message.MessageHandlerImpl;
import fr.ms.log4jdbc.message.resultset.CellImpl;
import fr.ms.log4jdbc.message.resultset.ResultSetCollectorImpl;
import fr.ms.log4jdbc.sql.Query;

/**
 * 
 * @see Marco4J
 * 
 * 
 * @author Marco Semiao
 * 
 */
public class ResultSetHandler implements MessageFactory {

  private final Query query;

  private final ResultSetCollectorImpl resultSetCollector;

  private final ResultSet rs;

  private int position = 0;

  private CellImpl lastCell;

  public ResultSetHandler(final Query query, final ResultSet rs) {
    this.query = query;
    this.rs = rs;
    this.resultSetCollector = (ResultSetCollectorImpl) query.getResultSetCollector();
  }

  public MessageHandlerImpl transformMessage(final Object proxy, final Method method, final Object[] args,
      final MessageInvocationContext mic, final MessageHandlerImpl message) {
    final TimeInvocation timeInvocation = mic.getInvokeTime();

    final Object invoke = timeInvocation.getInvoke();
    final Throwable targetException = timeInvocation.getTargetException();
    final String nameMethod = method.getName();

    final boolean nextMethod = nameMethod.equals("next") && invoke != null && ((Boolean) invoke).booleanValue();
    if (nextMethod) {
      if (position == -1) {
        try {
          if (targetException == null) {
            position = rs.getRow();
          } else {
            position = Integer.MAX_VALUE;
          }
        } catch (final Throwable e) {
          position = Integer.MAX_VALUE;
        }
      } else {
        position++;
      }

      if (!resultSetCollector.isClosed()) {
        message.setQuery(query);
      }

      return message;
    }

    final boolean previousMethod = nameMethod.equals("previous") && invoke != null && ((Boolean) invoke).booleanValue();
    if (previousMethod) {
      if (position == -1) {
        try {
          if (targetException == null) {
            position = rs.getRow();
          } else {
            position = Integer.MAX_VALUE;
          }
        } catch (final Throwable e) {
          position = Integer.MAX_VALUE;
        }
      } else {
        position--;
      }

      if (!resultSetCollector.isClosed()) {
        message.setQuery(query);
      }

      return message;
    }

    final boolean firstMethod = nameMethod.equals("first") && invoke != null && ((Boolean) invoke).booleanValue();
    if (firstMethod) {
      position = 1;

      if (!resultSetCollector.isClosed()) {
        message.setQuery(query);
      }

      return message;
    }

    final boolean lastMethod = nameMethod.equals("last") && invoke != null && ((Boolean) invoke).booleanValue();
    if (lastMethod) {
      try {
        if (targetException == null) {
          position = rs.getRow();
        } else {
          position = Integer.MAX_VALUE;
        }
      } catch (final Throwable e) {
        position = Integer.MAX_VALUE;
      }

      if (!resultSetCollector.isClosed()) {
        message.setQuery(query);
      }

      return message;
    }

    final boolean beforeFirstMethod = nameMethod.equals("beforeFirst");
    if (beforeFirstMethod) {
      position = 0;

      if (!resultSetCollector.isClosed()) {
        message.setQuery(query);
      }

      return message;
    }

    final boolean afterLastMethod = nameMethod.equals("afterLast");
    if (afterLastMethod) {
      position = -1;

      if (!resultSetCollector.isClosed()) {
        message.setQuery(query);
      }

      return message;
    }

    final boolean wasNullMethod = nameMethod.equals("wasNull") && lastCell != null && invoke != null
        && ((Boolean) invoke).booleanValue();
    if (wasNullMethod) {
      lastCell.wasNull();
      return message;
    }

    final boolean getMetaDataMethod = nameMethod.startsWith("getMetaData") && invoke != null;
    if (getMetaDataMethod) {

      if (resultSetCollector.getColumns().length == 0) {
        final ResultSetMetaData resultSetMetaData = (ResultSetMetaData) invoke;
        resultSetCollector.setColumnsDetail(resultSetMetaData);
      }
      return message;
    }

    final boolean closeMethod = nameMethod.startsWith("close") && !resultSetCollector.isClosed();
    if (closeMethod) {
      message.setQuery(query);
      resultSetCollector.close();
      return message;
    }

    final boolean getValueColumn = nameMethod.startsWith("get") && targetException == null && args != null
        && args.length > 0;
    if (getValueColumn) {
      final Class arg0Type = method.getParameterTypes()[0];
      if (Integer.class.equals(arg0Type) || Integer.TYPE.equals(arg0Type)) {
        final Integer arg = (Integer) args[0];
        lastCell = resultSetCollector.addValueColumn(position, invoke, arg.intValue());
      } else if (String.class.equals(arg0Type)) {
        final String arg = (String) args[0];
        lastCell = resultSetCollector.addValueColumn(position, invoke, arg);
      }
      return message;
    }

    return message;
  }

  public Object wrap(final Object invoke, final Object[] args, final MessageInvocationContext mic) {
    return invoke;
  }
}