// Zorah Fung, CSE 142
// This program reads an address book and asks the user for a domain name to spam.
// If an email with the domain name is found in the address book, the user is asked
// whether the person's name and email should be added to the "spam list"

import java.util.*; // For Scanner
import java.io.*; // For Files

/*
   Each line of the file is guaranteed to start with the last name and then the first name
   followed by an arbitrary number of tokens
   <last name> <first name> ....
   Ex: Fung Zorah CSE 446 Paul G. Allen Center zorahtheexplorer@gmail.com zorahf@cs.washington.edu
*/

public class Spammer {
   public static void main(String[] args) throws FileNotFoundException {
      Scanner fileScan = new Scanner(new File("address_book.txt"));
      Scanner console = new Scanner(System.in);
      PrintStream spamList = new PrintStream(new File("spam_list.txt"));
      
      System.out.print("Email domain to spam? ");
      String domain = console.nextLine();
      
      while (fileScan.hasNextLine()) {
         // Read a single contact
         String line = fileScan.nextLine();
         readContact(line, domain, console, spamList);
      }
   }
   
   // Processing a contact on the given line, looking for an email with the given domain.
   // If an email with the domain is found, the user is asked whether they want the first name,
   // last name and email printed to the given PrintStream
   public static void readContact(String line, String domain, Scanner console, PrintStream spamList) {
      Scanner tokens = new Scanner(line);
      
      // Each line guaranteed to start with <last-name> <first-name>
      String lastName = tokens.next();
      String firstName = tokens.next();
      while (tokens.hasNext()) {
         String token = tokens.next();
         if (token.endsWith(domain)) {
            // Found an email!
            System.out.print("Would you like to spam " + token +"? ");
            String response = console.nextLine();
            if (response.toLowerCase().startsWith("y")) {
               spamList.println(firstName + " " + lastName + " <" + token + ">");
            }
         }
      }
   }
}