/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you 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.hadoop.chukwa.database;
  
  import java.io.*;
  import java.sql.*;
  import java.util.*;
  import org.apache.hadoop.chukwa.util.ExceptionUtil;
  import org.apache.hadoop.chukwa.util.DatabaseWriter;
  import org.apache.hadoop.chukwa.database.TableCreator;
  
  public class DatabaseSetup {
    public long[] timeWindow = {7, 30, 91, 365, 3650};
    public String[] tables = {"system_metrics","disk","cluster_system_metrics","cluster_disk","mr_job","mr_task","dfs_namenode","dfs_datanode","dfs_fsnamesystem","dfs_throughput","hadoop_jvm","hadoop_mapred","hdfs_usage"};
    public String cluster = "demo";
    public long current = Calendar.getInstance().getTimeInMillis();
  
    public void setUpDatabase() throws Exception {
      System.setProperty("CLUSTER","demo");
      DatabaseWriter db = new DatabaseWriter(cluster);
      String buffer = "";
      File aFile = new File(System.getenv("CHUKWA_CONF_DIR")
          + File.separator + "database_create_tables.sql");
      buffer = readFile(aFile);
      String tables[] = buffer.split(";");
      for(String table : tables) {
        if(table.length()>5) {
          db.execute(table);
        }
      }
      db.close();
      for(int i=0;i<timeWindow.length;i++) {
        TableCreator tc = new TableCreator();
        long start = current;
        long end = current + (timeWindow[i]*1440*60*1000);
        tc.createTables(start, end);
      }
    }
  
    public void tearDownDatabase() {
      DatabaseWriter db = null;
      try {
        db = new DatabaseWriter(cluster);
        ResultSet rs = db.query("show tables");
        ArrayList<String> list = new ArrayList<String>();
        while(rs.next()) {
          String table = rs.getString(1);
          list.add(table);
        }
        for(String table : list) {
          db.execute("drop table "+table);
        }
      } catch(Throwable ex) {
      } finally {
        if(db!=null) {
          db.close();
        }
      }
    }
  
    public String readFile(File aFile) {
      StringBuffer contents = new StringBuffer();
      try {
        BufferedReader input = new BufferedReader(new FileReader(aFile));
        try {
          String line = null; // not declared within while loop
          while ((line = input.readLine()) != null) {
            contents.append(line);
            contents.append(System.getProperty("line.separator"));
          }
        } finally {
          input.close();
        }
      } catch (IOException ex) {
        ex.printStackTrace();
      }
      return contents.toString();
    }
      
  }