/*
 * Copyright 2011 Alibaba Group.
 *
 * 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.alibaba.druid.proxy.jdbc;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.SQLWarning;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import com.alibaba.druid.filter.FilterChain;
import com.alibaba.druid.filter.FilterChainImpl;

/**
 * 
 * @author shaojin.wensj
 *
 */
public class StatementProxyImpl extends WrapperProxyImpl implements StatementProxy {
	private final ConnectionProxy connection;
	private final Statement statement;

	// 通过CounterEventListener来维护
	protected long lastExecuteStartTime;
	protected long lastExecuteStartNano;
	protected long lastExecuteCompleteTime;
	protected long lastExecuteCompleteNano;
	protected String lastExecuteSql;

	protected ArrayList<String> batchSqlList;

	public StatementProxyImpl(ConnectionProxy connection, Statement statement, long id) {
		super(statement, id);
		this.connection = connection;
		this.statement = statement;
	}

	public ConnectionProxy getConnectionProxy() {
		return connection;
	}

	public Statement getStatementRaw() {
		return this.statement;
	}

	public FilterChain createChain() {
		return new FilterChainImpl(this.connection.getDirectDataSource());
	}

	@Override
	public void addBatch(String sql) throws SQLException {
		if (batchSqlList == null) {
			batchSqlList  = new ArrayList<String>();
		}
		
		createChain().statement_addBatch(this, sql);
		batchSqlList.add(sql);
	}

	@Override
	public void cancel() throws SQLException {
		createChain().statement_cancel(this);
	}

	@Override
	public void clearBatch() throws SQLException {
		if (batchSqlList == null) {
			batchSqlList  = new ArrayList<String>();
		}
		
		createChain().statement_clearBatch(this);
		batchSqlList.clear();
	}

	@Override
	public void clearWarnings() throws SQLException {
		createChain().statement_clearWarnings(this);
	}

	@Override
	public void close() throws SQLException {
		createChain().statement_close(this);
	}

	@Override
	public boolean execute(String sql) throws SQLException {
		lastExecuteSql = sql;
		return createChain().statement_execute(this, sql);
	}

	@Override
	public boolean execute(String sql, int autoGeneratedKeys) throws SQLException {
		lastExecuteSql = sql;
		return createChain().statement_execute(this, sql, autoGeneratedKeys);
	}

	@Override
	public boolean execute(String sql, int[] columnIndexes) throws SQLException {
		lastExecuteSql = sql;
		return createChain().statement_execute(this, sql, columnIndexes);
	}

	@Override
	public boolean execute(String sql, String[] columnNames) throws SQLException {
		lastExecuteSql = sql;
		return createChain().statement_execute(this, sql, columnNames);
	}

	@Override
	public int[] executeBatch() throws SQLException {
		return createChain().statement_executeBatch(this);
	}

	@Override
	public ResultSet executeQuery(String sql) throws SQLException {
		lastExecuteSql = sql;
		return createChain().statement_executeQuery(this, sql);
	}

	@Override
	public int executeUpdate(String sql) throws SQLException {
		lastExecuteSql = sql;
		return createChain().statement_executeUpdate(this, sql);
	}

	@Override
	public int executeUpdate(String sql, int autoGeneratedKeys) throws SQLException {
		lastExecuteSql = sql;
		return createChain().statement_executeUpdate(this, sql, autoGeneratedKeys);
	}

	@Override
	public int executeUpdate(String sql, int[] columnIndexes) throws SQLException {
		lastExecuteSql = sql;
		return createChain().statement_executeUpdate(this, sql, columnIndexes);
	}

	@Override
	public int executeUpdate(String sql, String[] columnNames) throws SQLException {
		lastExecuteSql = sql;
		return createChain().statement_executeUpdate(this, sql, columnNames);
	}

	@Override
	public Connection getConnection() throws SQLException {
		return createChain().statement_getConnection(this);
	}

	@Override
	public int getFetchDirection() throws SQLException {
		return createChain().statement_getFetchDirection(this);
	}

	@Override
	public int getFetchSize() throws SQLException {
		return createChain().statement_getFetchSize(this);
	}

	@Override
	public ResultSet getGeneratedKeys() throws SQLException {
		return createChain().statement_getGeneratedKeys(this);
	}

	@Override
	public int getMaxFieldSize() throws SQLException {
		return createChain().statement_getMaxFieldSize(this);
	}

	@Override
	public int getMaxRows() throws SQLException {
		return createChain().statement_getMaxRows(this);
	}

	@Override
	public boolean getMoreResults() throws SQLException {
		return createChain().statement_getMoreResults(this);
	}

	@Override
	public boolean getMoreResults(int current) throws SQLException {
		return createChain().statement_getMoreResults(this, current);
	}

	@Override
	public int getQueryTimeout() throws SQLException {
		return createChain().statement_getQueryTimeout(this);
	}

	@Override
	public ResultSet getResultSet() throws SQLException {
		return createChain().statement_getResultSet(this);
	}

	@Override
	public int getResultSetConcurrency() throws SQLException {
		return createChain().statement_getResultSetConcurrency(this);
	}

	@Override
	public int getResultSetHoldability() throws SQLException {
		return createChain().statement_getResultSetHoldability(this);
	}

	@Override
	public int getResultSetType() throws SQLException {
		return createChain().statement_getResultSetType(this);
	}

	@Override
	public int getUpdateCount() throws SQLException {
		return createChain().statement_getUpdateCount(this);
	}

	@Override
	public SQLWarning getWarnings() throws SQLException {
		return createChain().statement_getWarnings(this);
	}

	@Override
	public boolean isClosed() throws SQLException {
		return createChain().statement_isClosed(this);
	}

	@Override
	public boolean isPoolable() throws SQLException {
		return createChain().statement_isPoolable(this);
	}

	@Override
	public void setCursorName(String name) throws SQLException {
		createChain().statement_setCursorName(this, name);
	}

	@Override
	public void setEscapeProcessing(boolean enable) throws SQLException {
		createChain().statement_setEscapeProcessing(this, enable);
	}

	@Override
	public void setFetchDirection(int direction) throws SQLException {
		createChain().statement_setFetchDirection(this, direction);
	}

	@Override
	public void setFetchSize(int rows) throws SQLException {
		createChain().statement_setFetchSize(this, rows);
	}

	@Override
	public void setMaxFieldSize(int max) throws SQLException {
		createChain().statement_setMaxFieldSize(this, max);
	}

	@Override
	public void setMaxRows(int max) throws SQLException {
		createChain().statement_setMaxRows(this, max);
	}

	@Override
	public void setPoolable(boolean poolable) throws SQLException {
		createChain().statement_setPoolable(this, poolable);
	}

	@Override
	public void setQueryTimeout(int seconds) throws SQLException {
		createChain().statement_setQueryTimeout(this, seconds);
	}

	@Override
	public List<String> getBatchSqlList() {
		if (batchSqlList == null) {
			batchSqlList  = new ArrayList<String>();
		}
		
		return batchSqlList;
	}

	@Override
	public String getBatchSql() {
		List<String> sqlList = getBatchSqlList();
		StringBuffer buf = new StringBuffer();
		for (String item : sqlList) {
			if (buf.length() > 0) {
				buf.append("\n;\n");
			}
			buf.append(item);
		}
		return buf.toString();
	}

	public String getLastExecuteSql() {
		return lastExecuteSql;
	}
}