import javax.swing.*;
import java.io.*;

public class SudokuGenerator {
    public static int[][] generateGrid() {
        // grille par défaut
        int[][] grid = {
            {0, 0, 0, 9, 0, 5, 0, 0, 4},
            {5, 0, 3, 0, 0, 4, 0, 8, 7},
            {0, 0, 0, 7, 0, 0, 6, 0, 3},
            {9, 0, 0, 0, 3, 4, 0, 8, 0},
            {0, 4, 0, 0, 1, 0, 0, 7, 0},
            {0, 2, 0, 5, 7, 0, 0, 0, 6},
            {4, 0, 9, 0, 0, 2, 0, 0, 0},
            {6, 0, 7, 9, 0, 3, 0, 2, 1},
            {2, 0, 0, 6, 5, 0, 0, 0, 0}
        };

        return grid;
    }

    public static int[][] readGridFromFile() {
        int[][] grid = new int[9][9];
        JFileChooser fileChooser = new JFileChooser();
        int result = fileChooser.showOpenDialog(null);
        if (result == JFileChooser.APPROVE_OPTION) {
            File selectedFile = fileChooser.getSelectedFile();
            try (BufferedReader reader = new BufferedReader(new FileReader(selectedFile))) {
                for (int i = 0; i < 9; i++) {
                    String line = reader.readLine();
                    // Vérifier la longueur de la ligne lue
                    if (line.length() != 9) {
                        JOptionPane.showMessageDialog(null, "Invalid file format. Please select a file with correct Sudoku grid format.");
                        return generateGrid(); // Charger la grille par défaut en cas d'erreur
                    }
                    for (int j = 0; j < 9; j++) {
                        char ch = line.charAt(j);
                        if (ch >= '1' && ch <= '9') {
                            grid[i][j] = Character.getNumericValue(ch);
                        } else {
                            grid[i][j] = 0;
                        }
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return grid;
    }
}