package com.pms.util;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * 執行 linux命令
 *
 * @author mars
 *
 */
public class ExecuteLinux {

 // log4j例項名
 private static final Log log = LogFactory.getLog(ExecuteLinux.class
   .getCanonicalName());

 /**
  * 執行linux命令，並輸出結果
  *
  * @param cmd
  * @throws RuntimeException
  * @throws IOException
  */
 public static void execute(String[] cmd) throws Exception {
  InputStream errorStream = null;
  InputStream inputStream = null ;
  Process ps = null;
  try {
   // String[] cmd = new String[] { "/bin/sh", "-c", "ls" };
   ps = Runtime.getRuntime().exec(cmd);
   log.debug("開始執行本地執行緒");
   
   errorStream = ps.getErrorStream(); // 正確結果的流
   inputStream = ps.getInputStream(); // 錯誤結果的流
   printError(errorStream);
   printInfo(inputStream);
   
  } catch (Exception e) {
   log.error("execute linux command error...", e);
   throw new Exception("execute linux command error...");
  }finally{
   if(errorStream != null){
    errorStream.close();
   }
   if(inputStream != null){
    inputStream.close();
   }
   
   ps.destroy();
  }
  
 }
 
 /**
  * 列印  正確資訊
  * @param errorStream
  * @throws IOException
  */
 private static void printInfo(InputStream inputStream) throws IOException{
  
  StringBuffer sb = new StringBuffer();
  int line=0;
  while ((line = inputStream.read(new byte[1024])) != -1) {
   sb.append((char)line).append("\n");
  }
  String result = sb.toString();
  System.out.println("#####正確資訊######:"+result);
  log.debug("#####正確資訊LOG######:"+result);
 }
 
 /**
  * 列印錯誤資訊
  * @param errorStream
  * @throws IOException
  */
 private static void printError(InputStream errorStream) throws IOException{
  
  StringBuffer sb = new StringBuffer();
  int line=0;
  while ((line = errorStream.read(new byte[1024])) != -1) {
   sb.append((char)line).append("\n");
  }
  String result = sb.toString();
  System.out.println("#####錯誤資訊######:"+result);
  log.debug("#####錯誤資訊LOG######:"+result);
 }
 
 /**
  * 獲得 wgrib2 切割的linux命令,將grib2切割為二進位制 bin 檔案
  * @param pathName 檔案路徑名
  * @param fileName 檔名
  * @param savePath 要儲存到的路徑名
  * @param lists 條件集合（必不為空，因為從資料庫獲得，而存入資料庫時，前臺有校驗不為空）
  * @return
  */
 public static String[] getLinuxCommand(String pathName, String fileName, String savePath, List<String> lists){
  
  //"/bin/sh", "-c",
  String[] cmd = new String[3];
  cmd[0] = "/bin/sh";
  cmd[1] = "-c";
  
  StringBuffer condition_bf = new StringBuffer();
  for (String str : lists) {
   condition_bf.append(str+" mb|");
  }
  // 將最後一個 '|' 符號截掉
  String condition_str = condition_bf.toString().substring(0, condition_bf.toString().length()-1);
  //wgrib2 -s Z_NAFP_C_BABJ_20120508000000_P_CNPC-T639-GMFS-HNEHE-00300.grib2 | grep -E "(\bHGT:20\b)|(\bHGT:30\b)" | wgrib2 -i Z_NAFP_C_BABJ_20120508000000_P_CNPC-T639-GMFS-HNEHE-00300.grib2 -no_header -bin data5.bin
  StringBuffer bf = new StringBuffer();
  bf.append("wgrib2 -s ");
  bf.append(pathName+"/"+fileName);
  bf.append(" | grep -E ");
  bf.append("\""+condition_str+"\"");
  bf.append(" | wgrib2 -i ");
  bf.append(pathName+"/"+fileName);
  bf.append(" -no_header -bin ");
  String newName = fileName.substring(0, fileName.indexOf(".")); // 去掉 .grib2 的檔名
  bf.append(savePath+"/"+newName+".bin");
  cmd[2] = bf.toString();
  
  return cmd;
 }
 
 public static void main(String[] args) {
//  String str = "new.grib2";
//  System.out.println(str.substring(0, str.indexOf(".")));
//  
//  String pathName = "/home/ftp/cwfs";
//  String fileName = "new_003.grib2";
//  String savePath ="/home/ftp/cwfs";
//  
//  List<String> lists = new ArrayList<String>();
//  lists.add("HET:20");
//  String[] command = getLinuxCommand(pathName, fileName, savePath, lists);
//  
//  System.out.println(command[2]);
  
//  File file = new File("E:temp");
//  System.out.println(file.getParent());
//  File[] listFiles = file.listFiles();
//  if(listFiles != null && listFiles.length > 0){
//   for (File f : listFiles) {
//    f.delete();
//   }
//  }
  
//  File[] list = file.listFiles();
//  for (File s : list) {
//   System.out.println(s.getPath());
//  }
  
 }
}