Main.java

import java.util.*;

public class Main {
    private static void showInstructions() {
        System.out.println("🧩 Welcome to Sudoku Console Edition!");
        System.out.println("\nGeneral Rules:");
        System.out.println("1. Fill each row, column, and 3x3 grid with numbers 1-9 without duplicates.");
        System.out.println("2. You cannot change original (pre-filled) values.");
        System.out.println("3. Choose a cell by entering its row and column (0-8), followed by a number (1-9).");
        System.out.println("4. Difficulty level will determine feedback, lives, and re-editing rules.");
        System.out.println("5. Game ends when the board is completely and correctly filled.");
        System.out.println("6. Leaderboards are stored by difficulty in the 'results' folder.\n");
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        showInstructions();

        System.out.print("Enter your name: ");
        String playerName = scanner.nextLine();

        System.out.println("Choose difficulty (easy / medium / hard / extreme): ");
        String levelInput = scanner.nextLine().toUpperCase();
        Difficulty level;

        try {
            level = Difficulty.valueOf(levelInput);
        } catch (IllegalArgumentException e) {
            System.out.println("Invalid difficulty. Defaulting to EASY.");
            level = Difficulty.EASY;
        }

        Player player = new Player(playerName, level);

        System.out.println("\n📘 Selected Difficulty: " + level);

        switch (level) {
            case EASY:
                System.out.println("  Mode: EASY");
                System.out.println("    Unlimited lives");
                System.out.println("    Feedback: Shows if input is correct or wrong");
                System.out.println("    You can re-edit your inputs freely\n");
                break;

            case MEDIUM:
                System.out.println("  Mode: MEDIUM");
                System.out.println("    Unlimited lives");
                System.out.println("    No feedback on correctness");
                System.out.println("    You can re-edit your inputs freely\n");
                break;

            case HARD:
                System.out.println("  Mode: HARD");
                System.out.println("    5 lives");
                System.out.println("    No feedback on correctness");
                System.out.println("    You can re-edit inputs, but wrong answers cost a life\n");
                break;

            case EXTREME:
                System.out.println("  Mode: EXTREME");
                System.out.println("    3 lives");
                System.out.println("    No feedback on correctness");
                System.out.println("    No re-editing allowed — wrong moves lock the cell");
                System.out.println("    Game over after 3 wrong attempts\n");
                break;
        }

        SudokuGenerator generator = new SudokuGenerator();
        int[][] fullBoard = generator.generateFullBoard();
        int[][] puzzleBoard = generator.generatePuzzleBoard(level);

        long startTime = System.currentTimeMillis();

        GameManager gameManager = new GameManager();
        gameManager.startGame(scanner, fullBoard, puzzleBoard, player);

        long endTime = System.currentTimeMillis();
        long timeTaken = (endTime - startTime) / 1000;
        player.setTimeTakenInSeconds(timeTaken);

        System.out.println("\n🎉 Congratulations " + playerName + "!");
        System.out.println(" Difficulty: " + level);
        System.out.println("⏱ Time taken: " + timeTaken + " seconds");
    }
}