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

import java.io.File;

public class cd extends VMachine {
    
    /** Creates new cd */
    public cd() {
    }
    
    public void run() {
        
        if(args.length == 1)				// I there is only 1 argument which is expected properly change directories
        {
            String path = args[0];
            
            try
            {
                File tfile;
                User curuser = sysapi.findUser(owner);
                if(args[0].trim().compareTo("..")==0)			// Test for ".." and return to parent directory if found
                {
                    tfile = new File(curuser.getcurrentPath());
                    tfile = new File(tfile.getParent());
                    if(tfile.isDirectory())
                    {
                        curuser.setcurrentPath(tfile.getPath() + "\\");
                    }
                else
                    {
                        sysapi.Write(OUT,"Path is not a directory.\n");
                    }
                }
                else if (args[0].trim().compareTo(".")==0)
                {
                    
                }

                else
                {
                    
                    tfile = new File(curuser.getcurrentPath() + path + "\\");		// Get current path and add the arguments path
                    if(tfile.isDirectory())
                    {
                        curuser.setcurrentPath(tfile.getPath() + "\\");			// Set the path.
                    }
                    else
                    {
                        sysapi.Write(OUT,"Path is not a directory.\n");			// Error statement if argument is not a directory
                    }
                }
                
            }
            catch(Exception ex)
            {
                try
                {
                    sysapi.Write(OUT,"Path not Found.\n");					
                }
                catch(Exception ex1)
                {
                    System.out.println(ex1);
                }
            }
        }
        else if(args.length == 0)
        {
            try
            {
                sysapi.Write(OUT,"No path provided.\n");				// Error for having no arguments
            }
            catch(Exception ex1)
            {
                System.out.println(ex1);
            }
        }
        else
        {
            try
            {
                sysapi.Write(OUT,"Too many arguments.\n");				// Error for having to many arguments
            }
            catch(Exception ex1)
            {
                System.out.println(ex1);
            }
        }
        sysapi.Exit(vmh,owner);								
    }
    
}