import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

/**
 * Hangman game GUI.
 * Variables/methods and comments in English.
 * User-facing texts remain in French.
 */
public class HangmanGUI extends JFrame {
    private final String[] words = {
        "ordinateur","voiture","maison","soleil","lumiere",
        "fromage","chocolat","montagne","riviere","plage",
        "oiseau","papillon","musique","chateau","livre",
        "telephone","aventure","mystere","foret","fleur",
        "chapeau","nuage","horloge","chaise","fenetre",
        "paysage","bouteille","parapluie","clavier","souris",
        "brouillard","village","histoire","cerise","pomme",
        "banane","poisson","arbre","cascade","cheval"
    };

    private String secretWord;
    private final Set<Character> found = new HashSet<>();
    private final Set<Character> tried = new HashSet<>();
    private int errors = 0;
    private static final int MAX_ERRORS = 8; // 8 steps: base, post, beam, rope, head, body, arms, legs
    private boolean gameOver = false;        // indicates if the game is finished

    private final JLabel wordLbl = new JLabel("", SwingConstants.CENTER);
    private final JLabel triedLbl = new JLabel("", SwingConstants.CENTER);
    private final JLabel infoLbl  = new JLabel("Entrez une lettre (a-z)", SwingConstants.CENTER);
    private final JTextField input = new JTextField();
    private final JButton guessBtn = new JButton("Proposer");
    private final HangPanel hangPanel = new HangPanel();

    /** Drawing panel for the hangman, progressive according to error count. */
    private static class HangPanel extends JPanel {
        private int errors = 0;

        public void setErrors(int e) {
            this.errors = Math.max(0, Math.min(e, MAX_ERRORS));
            repaint();
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D gg = (Graphics2D) g;
            gg.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);

            int w = getWidth(), h = getHeight();
            int baseY = h - 40; // ground level

            if (errors >= 1) gg.drawLine(50, baseY, w - 50, baseY);

            if (errors >= 2) gg.drawLine(100, baseY, 100, 60);

            if (errors >= 3) gg.drawLine(100, 60, 220, 60);

            if (errors >= 4) gg.drawLine(220, 60, 220, 90);

            if (errors >= 5) gg.drawOval(200, 90, 40, 40);

            if (errors >= 6) gg.drawLine(220, 130, 220, 200);

            if (errors >= 7) {
                gg.drawLine(220, 145, 190, 165); 
                gg.drawLine(220, 145, 250, 165);
            }

            if (errors >= 8) {
                gg.drawLine(220, 200, 200, 240); 
                gg.drawLine(220, 200, 240, 240); 
            }
        }
    }

    /** Entry point: create and show the game window. */
    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> {
            HangmanGUI app = new HangmanGUI();
            app.setVisible(true);
        });
    }

    /** Constructor: window setup, UI setup, and start the game. */
    public HangmanGUI() {
        super("Jeu du Pendu");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setSize(520, 520);
        setLocationRelativeTo(null);
        setupUI();
        startGame();
    }

    /** Prepare the layout and interactions. */
    private void setupUI() {
        wordLbl.setFont(new Font(Font.MONOSPACED, Font.BOLD, 28));
        triedLbl.setFont(new Font("SansSerif", Font.PLAIN, 14));
        infoLbl.setFont(new Font("SansSerif", Font.PLAIN, 14));

        JPanel top = new JPanel(new GridLayout(3, 1, 8, 8));
        top.add(wordLbl);
        top.add(triedLbl);
        top.add(infoLbl);

        JPanel controls = new JPanel(new BorderLayout(8, 8));
        controls.add(input, BorderLayout.CENTER);
        controls.add(guessBtn, BorderLayout.EAST);

        hangPanel.setPreferredSize(new Dimension(480, 300));
        JPanel center = new JPanel(new BorderLayout());
        center.add(hangPanel, BorderLayout.CENTER);

        JPanel main = new JPanel(new BorderLayout(10, 10));
        main.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
        main.add(top, BorderLayout.NORTH);
        main.add(center, BorderLayout.CENTER);
        main.add(controls, BorderLayout.SOUTH);

        setContentPane(main);

        guessBtn.addActionListener(e -> onGuess());
        input.addActionListener(e -> onGuess()); 
        addWindowListener(new WindowAdapter() {
            @Override public void windowOpened(WindowEvent e) { input.requestFocusInWindow(); }
        });
    }

    /** Start a  game. */
    private void startGame() {
        secretWord = pickWord();
        found.clear();
        tried.clear();
        errors = 0;
        gameOver = false;

        input.setText("");
        input.setEditable(true);
        guessBtn.setEnabled(true);
        infoLbl.setText("Entrez une lettre (a-z)");
        updateUIState();
    }

    /** Handle a guess: validate input, update state, check for end of game. */
    private void onGuess() {
        if (gameOver) return; // block input after game end

        String s = input.getText().trim().toLowerCase(Locale.ROOT);
        if (s.length() != 1 || s.charAt(0) < 'a' || s.charAt(0) > 'z') {
            infoLbl.setText("Veuillez entrer une seule lettre (a-z).");
            input.selectAll();
            input.requestFocusInWindow();
            return;
        }
        char c = s.charAt(0);
        if (tried.contains(c)) {
            infoLbl.setText("Lettre déjà essayée : " + c);
            input.selectAll();
            input.requestFocusInWindow();
            return;
        }

        tried.add(c);
        boolean hit = false;
        for (int i = 0; i < secretWord.length(); i++) {
            if (Character.toLowerCase(secretWord.charAt(i)) == c) {
                found.add(c);
                hit = true;
            }
        }
        if (!hit) {
            errors++;
            infoLbl.setText("Mauvaise lettre : " + c);
        } else {
            infoLbl.setText("Bonne lettre : " + c);
        }

        updateUIState();
        input.selectAll();
        input.requestFocusInWindow();
    }

    /** Refresh labels/drawing and handle end-of-game. */
    private void updateUIState() {
        wordLbl.setText(maskWord(secretWord, found));
        triedLbl.setText("Lettres essayées : " + joinChars(tried));
        hangPanel.setErrors(errors);

        if (isWin(secretWord, found)) {
            infoLbl.setText("Bravo ! Vous avez trouvé le mot : " + secretWord);
            wordLbl.setText(spaced(secretWord)); // pretty display of the word
            gameOver = true;
            disableInput();
        } else if (errors >= MAX_ERRORS) {
            infoLbl.setText("Perdu ! Le mot était : " + secretWord);
            wordLbl.setText(spaced(secretWord));
            gameOver = true;
            disableInput();
        }

        // force UI refresh
        revalidate();
        repaint();
    }

    /** Disable controls after the game ends. */
    private void disableInput() {
        input.setEditable(false);
        guessBtn.setEnabled(false);
    }

    /** Pick a random word. */
    private String pickWord() {
        Random rnd = new Random();
        return words[rnd.nextInt(words.length)].toLowerCase(Locale.ROOT);
    }

    /** Build the masked word based on found letters. */
    private String maskWord(String secret, Set<Character> foundSet) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < secret.length(); i++) {
            char ch = secret.charAt(i);
            char lc = Character.toLowerCase(ch);
            if (Character.isLetter(lc) && !foundSet.contains(lc)) sb.append('_');
            else sb.append(ch);
            if (i < secret.length() - 1) sb.append(' ');
        }
        return sb.toString();
    }

    /** True if all letters have been found. */
    private boolean isWin(String secret, Set<Character> foundSet) {
        for (int i = 0; i < secret.length(); i++) {
            char lc = Character.toLowerCase(secret.charAt(i));
            if (Character.isLetter(lc) && !foundSet.contains(lc)) return false;
        }
        return true;
    }

    /** Sort and join letters for display. */
    private String joinChars(Set<Character> set) {
        java.util.List<Character> list = new ArrayList<>(set);
        Collections.sort(list);
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < list.size(); i++) {
            sb.append(list.get(i));
            if (i < list.size() - 1) sb.append(' ');
        }
        return sb.toString();
    }

    /** Add spaces between letters for nicer reading. */
    private String spaced(String s) {
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < s.length(); i++) {
            sb.append(s.charAt(i));
            if (i < s.length() - 1) sb.append(' ');
        }
        return sb.toString();
    }
}