/*	CS 352 helper class
 *      Author: Fan Zhang  
 *		Modified by: Tuan Phan	
 *      given.java
 *	a class with public method getnetwork to look into the routing 
 *	table, and to return the matching entries in the file
 */ 

import java.io.*;
import java.net.*;

public class given{
    /* currently, a max of 25 routes are possible */
    static public int MAX_ROUTES=25; 

    public target[] getnetwork (String file, int port)throws FileNotFoundException {
	RandomAccessFile in = new RandomAccessFile(file, "r"); //open file


	target[] temp = new target[this.MAX_ROUTES];	


	for(int j=0; j< this.MAX_ROUTES; j++)
	    temp[j] = new target();
	 	
	int i = 0;
	        
	try{
	    InetAddress me = InetAddress.getLocalHost();	
	    //get local machine InetAddress, i.e. "paul.rutgers.edu"
	    do {
		try{
		    //read file, line by line
				
		    String temp1 = new String(in.readLine());	
		    String temp2 = new String(in.readLine());
		    String temp3 = new String(in.readLine());
		    String temp4 = new String(in.readLine());
		    String temp5 = new String(in.readLine());
					
		    InetAddress address = InetAddress.getByName(temp1);
			InetAddress address2 = InetAddress.getByName(temp3);
				//get source machine InetAddress
						
		    if(me.equals(address)&&(port==Integer.parseInt(temp2)))
			//compare source machine name and local machine name, 
			//together with port number, to see if they match
			{		                               		
			    temp[i].set_sMachine(temp1);
			    temp[i].set_sPort(Integer.parseInt(temp2));
			    temp[i].set_tMachine(temp3);
			    temp[i].set_tPort(Integer.parseInt(temp4));
			    temp[i].set_Metric(Integer.parseInt(temp5));
			    i++;
			}
			else if(me.equals(address2)&&(port==Integer.parseInt(temp4)))
			{
				temp[i].set_sMachine(temp3);
			    temp[i].set_sPort(Integer.parseInt(temp4));
			    temp[i].set_tMachine(temp1);
			    temp[i].set_tPort(Integer.parseInt(temp2));
			    temp[i].set_Metric(Integer.parseInt(temp5));
			    i++;
			}			
							
		    String temp6 = new String(in.readLine());
				//read flag line
							       
		    if( !temp6.equals("") ) break;
		    //blank line seperate effective entries
		    //last line is "End"
			               
		}
					
		catch(UnknownHostException ioex){
		    System.out.println("Given: Cannot found host \n");
		}
		catch(IOException e){
		    System.out.println("Error Reading File \n");
		}
	    }
	    while(true);
	}
	catch(UnknownHostException e){
	    System.out.println("Local Host not Found !");
	}
						
	target[] result = new target[i];	//array to hold matching entries
		
	for( int j=0; j<i; j++)		//get matching entries
	    result[j] = new target(temp[j]);
		
	try{
	    in.close();
	}
	catch(IOException e){
	    System.out.println("Error Closing File \n");
	}
			
	return result;		//return matching result, in target array
    }


     public target[] getnetworkfromname (String hostname, String file, int port)throws FileNotFoundException {
        RandomAccessFile in = new RandomAccessFile(file, "r"); //open file


        target[] temp = new target[this.MAX_ROUTES];


        for(int j=0; j< this.MAX_ROUTES; j++)
            temp[j] = new target();

        int i = 0;

        try{
            InetAddress me = InetAddress.getByName(hostname);
            //get local machine InetAddress, i.e. "paul.rutgers.edu"
            do {
                try{
                    //read file, line by line

                    String temp1 = new String(in.readLine());
                    String temp2 = new String(in.readLine());
                    String temp3 = new String(in.readLine());
                    String temp4 = new String(in.readLine());
                    String temp5 = new String(in.readLine());

                    InetAddress address = InetAddress.getByName(temp1);
                        InetAddress address2 = InetAddress.getByName(temp3);
                                //get source machine InetAddress

                    if(me.equals(address)&&(port==Integer.parseInt(temp2)))
                        //compare source machine name and local machine name,
                        //together with port number, to see if they match
                        {
                            temp[i].set_sMachine(temp1);
                            temp[i].set_sPort(Integer.parseInt(temp2));
                            temp[i].set_tMachine(temp3);
                            temp[i].set_tPort(Integer.parseInt(temp4));
                            temp[i].set_Metric(Integer.parseInt(temp5));
                            i++;
                        }
                        else if(me.equals(address2)&&(port==Integer.parseInt(temp4)))
                        {
                                temp[i].set_sMachine(temp3);
                            temp[i].set_sPort(Integer.parseInt(temp4));
                            temp[i].set_tMachine(temp1);
                            temp[i].set_tPort(Integer.parseInt(temp2));
                            temp[i].set_Metric(Integer.parseInt(temp5));
                            i++;
                        }

                    String temp6 = new String(in.readLine());
			 if( !temp6.equals("") ) break;
                    //blank line seperate effective entries
                    //last line is "End"

                }

                catch(UnknownHostException ioex){
                    System.out.println("Given: Cannot found host \n");
                }
                catch(IOException e){
                    System.out.println("Error Reading File \n");
                }
            }
            while(true);
        }
        catch(UnknownHostException e){
            System.out.println("Local Host not Found !");
        }

        target[] result = new target[i];        //array to hold matching entries

        for( int j=0; j<i; j++)         //get matching entries
            result[j] = new target(temp[j]);

        try{
            in.close();
        }
        catch(IOException e){
            System.out.println("Error Closing File \n");
        }

        return result;          //return matching result, in target array
    }

     
}