/**
 * This class implements the board for the game MineSweeper.
 * 
 * @author John Paxton
 * @version 1.1 (January 21, 2004)
 */

import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;

public class GameBoard
{
    GameBoard ()
    {
        board = new Tile [SIZE + 2][SIZE + 2];
        
        console = new BufferedReader (new InputStreamReader (System.in));
    }
    
    public void initialize()
    {
        mineHit = false;
        successfulGuesses = 0;
        
        for (int row = 0; row < SIZE + 2; row++)
        {
            for (int col = 0; col < SIZE + 2; col++)
            {
                board[row][col] = new Tile();
            }
        }
        
        placeMines();
        
        for (int row = 1; row <= SIZE; row++)
        {
            for (int col = 1; col <= SIZE; col++)
            {
                board[row][col].setSurroundingMines( calculateMines (row, col) );
            }
        }
    }
    
    private void placeMines()
    {
        int placed = 0;
        int row;
        int col;
        
        while (placed < MINES)
        {
            row =  (int) (Math.random() * SIZE) + 1;
            col = (int) (Math.random() * SIZE) + 1;
            if (!board[row][col].getMine())
            {
                board[row][col].setMine();
                placed++;
            }
        }
    }
    
    private int calculateMines (int row, int col)
    {
        int answer = 0;
        
        for (int r = row - 1; r <= row + 1; r++)
        {
            for (int c = col -1; c <= col + 1; c++)
            {
                if ( board[r][c].getMine() )
                {
                    answer++;
                }
            }
        }
        
        return answer;
    }
            
    public void print ()
    {
        System.out.println();  
        System.out.print("   ");
        for (int row = 1; row <= SIZE; row++)
        {
            System.out.print("  " + row + " ");
        }
        System.out.println();
        
        for (int row = 1; row <= SIZE; row++)
        {
            printLine();
            System.out.print(row + "  ");
            for (int col = 1; col <= SIZE; col++)
            {
                System.out.print("| " + board[row][col].getPrintString() + " ");
            }
            System.out.println("|");
        }
        printLine();
        System.out.println();
        
        if (gameWon())
        {
            System.out.println("Congratulations, you won!");
        }
        else if (gameLost())
        {
            System.out.println("Sorry, you lost!");
        }
    }
    
    private void printLine()
    {
        System.out.print("   ");
        for (int i = 0; i < SIZE; i++)
        {
            System.out.print("+---");
        }
        System.out.println("+");
    }
    
    public void makeGuess()
    {
        int row = getGuess("row");
        int col = getGuess("column");
        
        if (board[row][col].getMine())
        {
            mineHit = true;
        }
        else if (!board[row][col].getGuessed())
        {
            successfulGuesses++;
        }
        
        board[row][col].setGuessed();
    }
    
    private int getGuess(String message)
    {
        try
        {
            int result;
            System.out.print("Please enter the " + message + ": ");
            result = Integer.parseInt(console.readLine());
            while ((result < 1) || (result > SIZE))
            {
                System.out.print("Invalid, please reenter: ");
                result = Integer.parseInt(console.readLine());
            }
            return result;
        }
        catch (IOException e)
        {
            System.out.println("Error trying to read input");
            return 1;
        }
    }
    
    public boolean gameOver ()
    {
        return (gameLost() || gameWon());
    }
    
    private boolean gameLost ()
    {
        return mineHit;
    }
    
    private boolean gameWon ()
    {
        return ( SIZE * SIZE - MINES == successfulGuesses);
    }
    
    private static final int SIZE = 3;
    private static final int MINES = 2;
    
    private Tile [][] board;
    private boolean mineHit;
    private int successfulGuesses;
    private BufferedReader console;
}