//File:  mv.java
//CS 471 - Operating Systems Project
//Dennis Pereira, Ely Soto, John Cavalieri

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

// This file moves a file to a certain directoy or renames the file if the directory doesn't exist.

public class mv extends VMachine
{
    public mv()
    {
    }
    
    public void run()
    {
        
        try
        {
            String currentFile = "";			// initialize variables
            String newFile = "";
            File fileObject, newName;
            
            StringTokenizer tokens;
            boolean flagged = false;
            
            if(args.length < 2)				// mv requires two arguments
            {
                sysapi.Write(OUT,"Error -- Not enough parameters\n");
                flagged = true;
            }
            else if(args.length > 2)			
            {
                sysapi.Write(OUT,"Error - Too many parameters\n");
            }
            else
            {
                tokens = new StringTokenizer(args[0]);
                currentFile = args[0];			// set current file
                newFile = args[1];				// set new file
            }
            
            
            fileObject = new File(sysapi.findUser(owner).getcurrentPath() + currentFile);	// Get current path and add file name
            newName = new File(sysapi.findUser(owner).getcurrentPath() + newFile);		// Assign it its new name or directory
            
            if(newName.isDirectory())		// move the file to the new directory path
            {
                newName = new File(sysapi.findUser(owner).getcurrentPath() + newFile + "/" + currentFile);
            }
            
            if(fileObject.exists())			// If the directory is not found rename it and keep in same directory
            {
                fileObject.renameTo(newName);
            }
            else						// Error statement if the file doesn't exist.
            {
                sysapi.Write(OUT, "Error -- File or directory does not exist.\n");
            }
            
            
            sysapi.Exit(vmh,owner);
            
        }
        catch (Exception err)
        {
            System.out.println("mv threw an Exception.\n");
        }
        
    }
    
}