import javax.swing.*;
import java.applet.Applet;
import java.awt.*;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;

/**
 * ************************************************************************
 * Copyright Slendy (c) 2018. All Right Reserved.
 * Any code contained within this document, and any associated APIs with similar branding
 * are the sole property of Slendy. Distribution, reproduction, taking snippets, or
 * claiming any contents as your own will break the terms of the license, and void any
 * agreements with you, the third party.
 * Thanks
 * ************************************************************************
 */
public class WordHunt extends Applet implements Runnable {

    private static ArrayList<String> words = new ArrayList<>();

    private TextField textField1;

    public static void main(String[] args) {
        File f = new File("words.txt");

        Scanner s = null;
        try {
            s = new Scanner(f);
        } catch (FileNotFoundException e) {
            JOptionPane.showMessageDialog(null, "You need to create a file called words.txt in the same directory");
        }
        ArrayList<String> words = new ArrayList<>();
        while(s.hasNext()){
            words.add(s.nextLine());
        }
        s.close();
        WordHunt wordHunt = new WordHunt(words);
        wordHunt.setPreferredSize(new Dimension(800, 800));
        wordHunt.init();

        JFrame mainFrame = new JFrame();
        mainFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        mainFrame.getContentPane().add(wordHunt);
        mainFrame.pack();
        mainFrame.setVisible(true);

        wordHunt.start();
    }

    private WordHunt(ArrayList<String> _words){
        words = _words;
    }

    public void init() {
        setFocusable(true);
        Label label1 = new Label("Word: ");
        textField1 = new TextField("");
        textField1.setColumns(50);
        Thread t = new Thread(this);
        t.start();


        add(label1);
        add(textField1);
    }

    @Override
    public void run() {
        for(;;){
            try {

                updateText();
                repaint();
                Thread.sleep(10);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public void paint(Graphics g){
        g.setFont(new Font("Arial", Font.PLAIN, 15));
        g.setColor(Color.black);
        int y = 60;
        int x = 0;
        int index = 0;
        int collumn = 0;
        int test = 0;
        for(String s : output.toString().split(";")){
            test++;
            index++;
            if(index > 45){
                index = 0;
                y = 60+15;
                collumn++;
            }

            g.drawString(s, (getWidth()/2 - (test > 1 ? 375 : 150)) + 85 * collumn, y);
            y+= 15;
        }
    }

    private Image i;

    public void update(Graphics g) {
        if ( i == null ) {
            i = createImage(getHeight(), getHeight());
        }
        Graphics g2 = i.getGraphics();

        g2.setColor(getBackground());
        g2.fillRect(0, 0, getWidth(), getHeight());

        g2.setColor(getForeground());
        paint(g2);
        g.drawImage(i, 0, 0, null);
    }



    private StringBuilder output = new StringBuilder();

    private void updateText(){
        String text = textField1.getText();
        ArrayList<String> possibleMatches = new ArrayList<>();
        for(String f : words){
            if(f.length() == text.length()){
                possibleMatches.add(f);
            }
        }
        ArrayList<String> matches = new ArrayList<>();
        for(String f : possibleMatches){
            int wildcards = 0;
            int matchingLetters = 0;
            for(int i = 0; i < f.length(); i++){
                if(text.charAt(i) != '_'){
                        if (text.charAt(i) == f.charAt(i)) {
                            matchingLetters++;
                        }
                } else {
                    wildcards++;
                }
            }

            if(wildcards == f.length()){
                matches.add(f);
            } else if(wildcards + matchingLetters == f.length()){
                matches.add(f);
            }
        }
        output = new StringBuilder();
        output.append("Found ").append(matches.size()).append(" matches;");
        for(String m : matches){
            output.append(m).append(";");
        }
        repaint();
    }
}