/**
    *    Copyright 2009-2019 the original author or authors.
    *
    *    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 org.apache.ibatis.jdbc;
  
  import static org.junit.jupiter.api.Assertions.*;
  
  import java.sql.Connection;
  import java.sql.PreparedStatement;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Properties;
  import java.util.concurrent.TimeUnit;
  
  import org.apache.ibatis.BaseDataTest;
  import org.apache.ibatis.datasource.pooled.PooledDataSource;
  import org.hsqldb.jdbc.JDBCConnection;
  import org.junit.jupiter.api.Disabled;
  import org.junit.jupiter.api.Test;
  
  class PooledDataSourceTest extends BaseDataTest {
  
    @Test
    void shouldProperlyMaintainPoolOf3ActiveAnd2IdleConnections() throws Exception {
      PooledDataSource ds = createPooledDataSource(JPETSTORE_PROPERTIES);
      try {
        runScript(ds, JPETSTORE_DDL);
        ds.setDefaultAutoCommit(false);
        ds.setDriverProperties(new Properties() {
          {
            setProperty("username", "sa");
            setProperty("password", "");
          }
        });
        ds.setPoolMaximumActiveConnections(3);
        ds.setPoolMaximumIdleConnections(2);
        ds.setPoolMaximumCheckoutTime(10000);
        ds.setPoolPingConnectionsNotUsedFor(1);
        ds.setPoolPingEnabled(true);
        ds.setPoolPingQuery("SELECT * FROM PRODUCT");
        ds.setPoolTimeToWait(10000);
        ds.setLogWriter(null);
        List<Connection> connections = new ArrayList<>();
        for (int i = 0; i < 3; i++) {
          connections.add(ds.getConnection());
        }
        assertEquals(3, ds.getPoolState().getActiveConnectionCount());
        for (Connection c : connections) {
          c.close();
        }
        assertEquals(2, ds.getPoolState().getIdleConnectionCount());
        assertEquals(4, ds.getPoolState().getRequestCount());
        assertEquals(0, ds.getPoolState().getBadConnectionCount());
        assertEquals(0, ds.getPoolState().getHadToWaitCount());
        assertEquals(0, ds.getPoolState().getAverageOverdueCheckoutTime());
        assertEquals(0, ds.getPoolState().getClaimedOverdueConnectionCount());
        assertEquals(0, ds.getPoolState().getAverageWaitTime());
        assertNotNull(ds.getPoolState().toString());
      } finally {
        ds.forceCloseAll();
      }
    }
  
    @Test
    void shouldNotFailCallingToStringOverAnInvalidConnection() throws Exception {
      PooledDataSource ds = createPooledDataSource(JPETSTORE_PROPERTIES);
      Connection c = ds.getConnection();
      c.close();
      c.toString();
    }
  
    @Test
    void ShouldReturnRealConnection() throws Exception {
      PooledDataSource ds = createPooledDataSource(JPETSTORE_PROPERTIES);
      Connection c = ds.getConnection();
      JDBCConnection realConnection = (JDBCConnection) PooledDataSource.unwrapConnection(c);
      c.close();
    }
  
    @Disabled("See the comments")
    @Test
    void shouldReconnectWhenServerKilledLeakedConnection() throws Exception {
      // See #748
      // Requirements:
      // 1. MySQL JDBC driver dependency.
     // 2. MySQL server instance with the following.
     //  - CREATE DATABASE `test`;
     //  - SET GLOBAL wait_timeout=3;
     // 3. Tweak the connection info below.
     final String URL = "jdbc:mysql://localhost:3306/test";
     final String USERNAME = "admin";
     final String PASSWORD = "";
 
     PooledDataSource ds = new PooledDataSource();
     ds.setDriver("com.mysql.jdbc.Driver");
     ds.setUrl(URL);
     ds.setUsername(USERNAME);
     ds.setPassword(PASSWORD);
     ds.setPoolMaximumActiveConnections(1);
     ds.setPoolMaximumIdleConnections(1);
     ds.setPoolTimeToWait(1000);
     ds.setPoolMaximumCheckoutTime(2000);
     ds.setPoolPingEnabled(true);
     ds.setPoolPingQuery("select 1");
     ds.setDefaultAutoCommit(true);
     // MySQL wait_timeout * 1000 or less. (unit:ms)
     ds.setPoolPingConnectionsNotUsedFor(1000);
 
     Connection con = ds.getConnection();
     exexuteQuery(con);
     // Simulate connection leak by not closing.
     // con.close();
 
     // Wait for disconnected from mysql...
     Thread.sleep(TimeUnit.SECONDS.toMillis(3));
 
     con.close();
 
     // Should return usable connection.
     con = ds.getConnection();
     exexuteQuery(con);
     con.close();
   }
 
   private void exexuteQuery(Connection con) throws SQLException {
     try (PreparedStatement st = con.prepareStatement("select 1");
          ResultSet rs = st.executeQuery()) {
       while (rs.next()) {
         assertEquals(1, rs.getInt(1));
       }
     }
   }
 }