import java.io.*;
import java.util.*;

class Command implements Runnable {
        FileSystem fSystem;
        String comd, theCommand;

                // Constructor to initialize the command
        Command( String c, FileSystem file_system) {
                comd = c;
                fSystem =  file_system;
        }
                // start up the command
        public void run(){
                         // if the comd is other than du, parse it further
                Parser another_parser = new Parser();
                another_parser.parse(comd, " ");
                ArrayList tmpList = another_parser.getTokens();
                theCommand = (String)tmpList.get(0);

                        // type exit to exit
                if (comd.compareTo("exit") == 0) fSystem.exitSystem();
                else if (comd.compareTo("du") == 0)
                        fSystem.DiskUsage();

                else if ((theCommand.compareTo("ln")==0)&&(tmpList.size()==4)){
                        String secComd = (String)tmpList.get(1);
                        String firstFileName = (String)tmpList.get(2);
                        String secFileName = (String)tmpList.get(3);
                        fSystem.MakeLink(firstFileName,secFileName);
                }
                else if ((theCommand.compareTo("rmdir")==0)&&(tmpList.size()==2)){
                        String file_name = (String)tmpList.get(1);
                        fSystem.RemoveDir(file_name);

                }
                else if((theCommand.compareTo("rm") == 0)&&(tmpList.size()==2)){
                        String file_name = (String)tmpList.get(1);
                        fSystem.RemoveSmFile(file_name);
                }
                else if((theCommand.compareTo("touch") == 0)
                    &&(tmpList.size()==2)){
                        String file_name = (String)tmpList.get(1);
                        fSystem.CreatEmpFile(file_name);

                }
                else if ((theCommand.compareTo("mkdir")==0)&&(tmpList.size()==2))
                        fSystem.MakeDirectory((String)tmpList.get(1));

                else if ((theCommand.compareTo("cd")==0)&&(tmpList.size()==2)) {
                        String postCommand = (String)tmpList.get(1);
                        if (postCommand.compareTo("..") == 0) {
                                fSystem.ChangeDirectoryUp();
                        }
                        else
                                fSystem.ChangeDirectoryDown(postCommand);
                }

                else
                        System.out.println(comd + ": Command not found.");
        } // end of run();
} // end of class command