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

//The send command is an enhanced function of our simulator.
//Its functionality is to send a messaage to another user
//the command would be given by issuing a 'send username message' command

public class send extends VMachine {
    
    /** Creates new send */
    public send() {
    }
    
    public void run() {
        
        try{
            
		//if there is only one argument then assume that the argument is the username
		//to send the message to
            if(args.length == 1)
            {
			//set the username
                String username = args[0];
			//see if the user is logged in
                User user = sysapi.findUser(username);
			//if the user is logged in
                if(user != null)
                {
			//prompt sender for message
                    String input = sysapi.Read(IN);
			//accept message until a blank line is typed
			//send each line as it is typed
                    for(int i = 0; input.compareTo("") != 0; i++)
                    {
                        user.sendmsg(owner + " - " + input + "\n");
				//prompt user for more input
                        input = sysapi.Read(IN);
                    }
                }
                else
                { sysapi.Write(OUT,"User not logged in.\n"); }
            }
		//if there are more than one arguments then assume the first is the 
		//username and the others are messages
            else if(args.length > 1)
            {
			//set username
                String username = args[0];
			//find the user
                User user = sysapi.findUser(username);
			//if the user is logged in                
                if(user != null)
                {
                    String buffer = owner + " -";
                    //for each argument send them as the message
                    for(int i = 1; i < args.length; i++)
                    {
                        buffer = buffer + " " + args[i];
                    }
                    buffer = buffer + "\n";
                    user.sendmsg(buffer);
                }
                else
                { sysapi.Write(OUT,"User not logged in.\n"); }
            }
            else
            { sysapi.Write(OUT,"No user specified.\n"); }
        }
        catch(Exception ex)
        {
            System.out.println("Send threw Exception: " + ex);
        }
        sysapi.Exit(vmh,owner);
    }
}