/*****************************************************************************
  * ExampleClient: example client for TigerBook and Person (prog. midterm 2) 
  * author: Princeton COS 126 course staff, Spring 2013 
  * dependencies: Person, TigerBook, StdIn, StdOut
  * 
  * This is a sample test client for TigerBook and Person. It reads commands
  * from standard input one at a time. The accepted command formats are:
  *
  *  person1 registers       : construct/register a person with name/id person1
  *  person1 posts <message> : calls post(<message>)
  *  person1 reads           : calls listMessages(), which prints output
  *  person1 meets person2   : calls meet()
  *  person1 queries person2 : calls knows() and prints output
  *  // <comment>            : comment line
  *
  * The <message> or <comment> can have spaces, but "person1" and "person2" 
  * MUST NOT have spaces in their names.
  * 
  * This program is very basic. So use caution if you write your own inputs:
  * for example, putting extra words or not enough words on one line can
  * cause errors that may seem unusual at first, and typos can be disastrous.
  *
  ****************************************************************************/

public class ExampleClient {
    public static void main(String[] args) {
        
        TigerBook tb = new TigerBook(); 

        while (!StdIn.isEmpty()) {

            String first = StdIn.readString(); // first word on line
            
            if (first.startsWith("//")) { // is this line a comment?
                StdIn.readLine();         // if so, skip the rest of the line
                continue;                 // and don't try to read an action
            }

            String name = first;                // the first word is a person 
            String action = StdIn.readString(); // now, read the action

            // now translate the action to method calls
            if (action.equals("registers")) {
                Person newUser = new Person(name);
                tb.register(name, newUser);
            }
            else if (action.equals("meets")) {
                String name2 = StdIn.readString();
                Person user1 = tb.lookup(name);
                Person user2 = tb.lookup(name2);
                user1.meet(user2);
            }
            else if (action.equals("posts")) {
                String message = StdIn.readLine(); // read rest of line
                message = message.substring(1);    // get rid of space at start
                Person user = tb.lookup(name);
                user.post(message);
            }
            else if (action.equals("queries")) {
                String name2 = StdIn.readString();
                Person user1 = tb.lookup(name);
                Person user2 = tb.lookup(name2);
                StdOut.print("Are "+name+" and "+name2+" friends? ");
                boolean isFriend = user1.knows(user2);
                StdOut.println(isFriend);
            }
            else if (action.equals("reads")) {
                Person user = tb.lookup(name);
                user.listMessages();
            }
            else {
                // this case would be triggered by a line like "person1 coughs"
                // but could also be caused by typos, or putting too many words
                // on one line, or not enough words on one line, etc
                String msg = "ExampleClient doesn't know how to perform action";
                msg += " \""+action+"\"\n Your input is misformatted, ";
                msg += "see the ExampleClient header comment for help";
                throw new RuntimeException(msg);
            }
        }
    }    
}