// CSE 143, Winter 2010, Marty Stepp
// Homework 4: Affection
//
// Instructor-provided testing program.

import java.io.*;
import java.util.*;

/** Class AffectionMain is the main client program for assassin game management.
    It reads names from a file names.txt, shuffles them, and uses them to
    start the game.  The user is asked for the name of the next sweetheart until
    the game is over. */
public class AffectionMain {
    /** input file name from which to read data */
    public static final String INPUT_FILENAME = "names.txt";
    
    /** true for different results every run; false for predictable results */
    public static final boolean RANDOM = true;
    
    /** If not random, use this value to guide the sequence of numbers
        that will be generated by the Random object. */
    public static final int SEED = 42;


    public static void main(String[] args) throws FileNotFoundException {
        // read names into a Set to eliminate duplicates
        File inputFile = new File(INPUT_FILENAME);
        if (!inputFile.canRead()) {
            System.out.println("Required input file not found; exiting.\n" + inputFile.getAbsolutePath());
            System.exit(1);
        }
        Scanner input = new Scanner(inputFile);
        
        Set<String> names = new TreeSet<String>(String.CASE_INSENSITIVE_ORDER);
        while (input.hasNextLine()) {
            String name = input.nextLine().trim().intern();
            if (name.length() > 0) {
                names.add(name);
            }
        }

        // transfer to an ArrayList, shuffle and build an AffectionManager
        List<String> nameList = new ArrayList<String>(names);
        Random rand = (RANDOM) ? new Random() : new Random(SEED);
        Collections.shuffle(nameList, rand);
        
        AffectionManager manager = new AffectionManager(nameList);

        // prompt the user for sweethearts until the game is over
        Scanner console = new Scanner(System.in);
        while (!manager.isGameOver()) {
            oneKiss(console, manager);
        }

        // report who won
        System.out.println("Game was won by " + manager.winner());
        System.out.println("Final schoolyard is as follows:");
        manager.printSchoolyard();
    }

    /** Handles the details of recording one sweetheart.  Shows the current kiss
        ring and schoolyard to the user, prompts for a name and records the
        kiss if the name is legal. */
    public static void oneKiss(Scanner console, AffectionManager manager) {
        // print both linked lists
        System.out.println("Current kiss ring:");
        manager.printKissRing();
        System.out.println("Current schoolyard:");
        manager.printSchoolyard();
        
        // prompt for next sweetheart to kiss
        System.out.println();
        System.out.print("next sweetheart? ");
        String name = console.nextLine().trim();
        
        // kiss the sweetheart, if possible
        if (manager.schoolyardContains(name)) {
            System.out.println(name + " is already kissed.");
        } else if (!manager.kissRingContains(name)) {
            System.out.println("Unknown person.");
        } else {
            manager.kiss(name);
        }
        System.out.println();
    }
}