/**
 * P6Spy
 *
 * Copyright (C) 2002 P6Spy
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.p6spy.engine.wrapper;

import java.sql.Array;
import java.sql.Blob;
import java.sql.CallableStatement;
import java.sql.Clob;
import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.NClob;
import java.sql.PreparedStatement;
import java.sql.SQLClientInfoException;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.SQLXML;
import java.sql.Savepoint;
import java.sql.Statement;
import java.sql.Struct;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;

import com.p6spy.engine.common.CallableStatementInformation;
import com.p6spy.engine.common.ConnectionInformation;
import com.p6spy.engine.common.PreparedStatementInformation;
import com.p6spy.engine.common.StatementInformation;
import com.p6spy.engine.event.JdbcEventListener;

/**
 * This implementation wraps a {@link Connection}  and notifies a {@link JdbcEventListener}
 * about certain method invocations.
 * <p>
 * This class implements the Wrapper or Decorator pattern. Methods default
 * to calling through to the wrapped request object.
 *
 * @see Connection
 */
public class ConnectionWrapper extends AbstractWrapper implements Connection {

  private final Connection delegate;
  private final JdbcEventListener jdbcEventListener;
  private final ConnectionInformation connectionInformation;

  public static ConnectionWrapper wrap(Connection delegate, JdbcEventListener eventListener, ConnectionInformation connectionInformation) {
    if (delegate == null) {
      return null;
    }
    final ConnectionWrapper connectionWrapper = new ConnectionWrapper(delegate, eventListener, connectionInformation);
    eventListener.onConnectionWrapped(connectionInformation);
    return connectionWrapper;
  }

  /**
   * Should only be called by {@link #wrap(Connection, JdbcEventListener, ConnectionInformation)}
   * <p>
   * Setting to protected instead of private, so that CGLIB can create a subclass/proxy
   * See also: {@code net.sf.cglib.proxy.Enhancer#filterConstructors} (protectedOk: true)
   */
  protected ConnectionWrapper(Connection delegate, JdbcEventListener jdbcEventListener, ConnectionInformation connectionInformation) {
    super(delegate);
    if (delegate == null) {
      throw new NullPointerException("Delegate must not be null");
    }
    this.delegate = delegate;
    this.connectionInformation = connectionInformation;
    this.jdbcEventListener = jdbcEventListener;
  }
  
  public JdbcEventListener getJdbcEventListener() {
    return this.jdbcEventListener;
  }

  public JdbcEventListener getEventListener() {
    return jdbcEventListener;
  }

  public Connection getDelegate() {
    return delegate;
  }

  public ConnectionInformation getConnectionInformation() {
    return connectionInformation;
  }

  @Override
  public Statement createStatement() throws SQLException {
    return StatementWrapper.wrap(delegate.createStatement(), new StatementInformation(connectionInformation), jdbcEventListener);
  }

  @Override
  public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
    return StatementWrapper.wrap(delegate.createStatement(resultSetType, resultSetConcurrency), new StatementInformation(connectionInformation), jdbcEventListener);
  }

  @Override
  public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
    return StatementWrapper.wrap(delegate.createStatement(resultSetType, resultSetConcurrency, resultSetHoldability), new StatementInformation(connectionInformation), jdbcEventListener);
  }

  @Override
  public PreparedStatement prepareStatement(String sql) throws SQLException {
    return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql), new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
  }

  @Override
  public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
    return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql, resultSetType, resultSetConcurrency), new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
  }

  @Override
  public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
    return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability), new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
  }

  @Override
  public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
    return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql, autoGeneratedKeys), new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
  }

  @Override
  public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
    return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql, columnIndexes), new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
  }

  @Override
  public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
    return PreparedStatementWrapper.wrap(delegate.prepareStatement(sql, columnNames), new PreparedStatementInformation(connectionInformation, sql), jdbcEventListener);
  }

  @Override
  public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws SQLException {
    return CallableStatementWrapper.wrap(delegate.prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability), new CallableStatementInformation(connectionInformation, sql), jdbcEventListener);
  }

  @Override
  public CallableStatement prepareCall(String sql) throws SQLException {
    return CallableStatementWrapper.wrap(delegate.prepareCall(sql), new CallableStatementInformation(connectionInformation, sql), jdbcEventListener);
  }

  @Override
  public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
    return CallableStatementWrapper.wrap(delegate.prepareCall(sql, resultSetType, resultSetConcurrency), new CallableStatementInformation(connectionInformation, sql), jdbcEventListener);
  }

  @Override
  public void commit() throws SQLException {
    SQLException e = null;
    long start = System.nanoTime();
    try {
      jdbcEventListener.onBeforeCommit(connectionInformation);
      delegate.commit();
    } catch (SQLException sqle) {
      e = sqle;
      throw e;
    } finally {
      jdbcEventListener.onAfterCommit(connectionInformation, System.nanoTime() - start, e);
    }
  }

  @Override
  public void rollback() throws SQLException {
    SQLException e = null;
    long start = System.nanoTime();
    try {
      jdbcEventListener.onBeforeRollback(connectionInformation);
      delegate.rollback();
    } catch (SQLException sqle) {
      e = sqle;
      throw e;
    } finally {
      jdbcEventListener.onAfterRollback(connectionInformation, System.nanoTime() - start, e);
    }
  }

  @Override
  public void rollback(Savepoint savepoint) throws SQLException {
    SQLException e = null;
    long start = System.nanoTime();
    try {
      jdbcEventListener.onBeforeRollback(connectionInformation);
      delegate.rollback(savepoint);
    } catch (SQLException sqle) {
      e = sqle;
      throw e;
    } finally {
      jdbcEventListener.onAfterRollback(connectionInformation, System.nanoTime() - start, e);
    }
  }

  @Override
  public String nativeSQL(String sql) throws SQLException {
    return delegate.nativeSQL(sql);
  }

  @Override
  public void setAutoCommit(boolean autoCommit) throws SQLException {
    SQLException e = null;
    boolean oldAutoCommit = delegate.getAutoCommit();
    try {
      jdbcEventListener.onBeforeSetAutoCommit(connectionInformation, autoCommit, oldAutoCommit);
      delegate.setAutoCommit(autoCommit);
    } catch (SQLException sqle){
      e = sqle;
      throw e;
    } finally {
      jdbcEventListener.onAfterSetAutoCommit(connectionInformation, autoCommit, oldAutoCommit, e);
    }
  }

  @Override
  public boolean getAutoCommit() throws SQLException {
    return delegate.getAutoCommit();
  }

  @Override
  public void close() throws SQLException {
    SQLException e = null;
    long start = System.nanoTime();
    try {
      delegate.close();
    } catch (SQLException sqle) {
      e = sqle;
      throw e;
    } finally {
      connectionInformation.setTimeToCloseConnectionNs(System.nanoTime() - start);
      jdbcEventListener.onAfterConnectionClose(connectionInformation, e);
    }
  }

  @Override
  public boolean isClosed() throws SQLException {
    return delegate.isClosed();
  }

  @Override
  public DatabaseMetaData getMetaData() throws SQLException {
    return delegate.getMetaData();
  }

  @Override
  public void setReadOnly(boolean readOnly) throws SQLException {
    delegate.setReadOnly(readOnly);
  }

  @Override
  public boolean isReadOnly() throws SQLException {
    return delegate.isReadOnly();
  }

  @Override
  public void setCatalog(String catalog) throws SQLException {
    delegate.setCatalog(catalog);
  }

  @Override
  public String getCatalog() throws SQLException {
    return delegate.getCatalog();
  }

  @Override
  public void setTransactionIsolation(int level) throws SQLException {
    delegate.setTransactionIsolation(level);
  }

  @Override
  public int getTransactionIsolation() throws SQLException {
    return delegate.getTransactionIsolation();
  }

  @Override
  public SQLWarning getWarnings() throws SQLException {
    return delegate.getWarnings();
  }

  @Override
  public void clearWarnings() throws SQLException {
    delegate.clearWarnings();
  }

  @Override
  public Map<String, Class<?>> getTypeMap() throws SQLException {
    return delegate.getTypeMap();
  }

  @Override
  public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
    delegate.setTypeMap(map);
  }

  @Override
  public void setHoldability(int holdability) throws SQLException {
    delegate.setHoldability(holdability);
  }

  @Override
  public int getHoldability() throws SQLException {
    return delegate.getHoldability();
  }

  @Override
  public Savepoint setSavepoint() throws SQLException {
    return delegate.setSavepoint();
  }

  @Override
  public Savepoint setSavepoint(String name) throws SQLException {
    return delegate.setSavepoint(name);
  }

  @Override
  public void releaseSavepoint(Savepoint savepoint) throws SQLException {
    delegate.releaseSavepoint(savepoint);
  }

  @Override
  public Clob createClob() throws SQLException {
    return delegate.createClob();
  }

  @Override
  public Blob createBlob() throws SQLException {
    return delegate.createBlob();
  }

  @Override
  public NClob createNClob() throws SQLException {
    return delegate.createNClob();
  }

  @Override
  public SQLXML createSQLXML() throws SQLException {
    return delegate.createSQLXML();
  }

  @Override
  public boolean isValid(int timeout) throws SQLException {
    return delegate.isValid(timeout);
  }

  @Override
  public void setClientInfo(String name, String value) throws SQLClientInfoException {
    delegate.setClientInfo(name, value);
  }

  @Override
  public void setClientInfo(Properties properties) throws SQLClientInfoException {
    delegate.setClientInfo(properties);
  }

  @Override
  public String getClientInfo(String name) throws SQLException {
    return delegate.getClientInfo(name);
  }

  @Override
  public Properties getClientInfo() throws SQLException {
    return delegate.getClientInfo();
  }

  @Override
  public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
    return delegate.createArrayOf(typeName, elements);
  }

  @Override
  public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
    return delegate.createStruct(typeName, attributes);
  }

  @Override
  public void setSchema(String schema) throws SQLException {
    delegate.setSchema(schema);
  }

  @Override
  public String getSchema() throws SQLException {
    return delegate.getSchema();
  }

  @Override
  public void abort(Executor executor) throws SQLException {
    delegate.abort(executor);
  }

  public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
    delegate.setNetworkTimeout(executor, milliseconds);
  }

  @Override
  public int getNetworkTimeout() throws SQLException {
    return delegate.getNetworkTimeout();
  }

}
