gameEngine.java

package oving7.sudoku;
import java.util.Scanner;
import java.util.Random;
import java.util.Stack;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.PrintWriter;
import java.util.ArrayList;

import oving7.sudoku.Board;

public class SudokuGame {
	Scanner inputScan = new Scanner(System.in);
	SudokuBoard sudokuBoard = new SudokuBoard(game_getSudokuGame());
	String inputString;
	static private ArrayList <String> gameMoves = new ArrayList <String>();
	static private Stack <String> regretMoves = new Stack <String>();
	private boolean play = true;
	
	void game_runGame() throws FileNotFoundException{
		game_displayGameInfo();
		while( play ){
			sudokuBoard.printBoard();
			inputString = inputScan.nextLine().toLowerCase();
			
			switch ( inputString ) {
			case "save":
				game_saveGame();
				System.out.println("game saved.");
				break;
			case "regret": {
				String regretMove = gameMoves.get( gameMoves.size() - 1 );
				char[] toChar = Character.toChars( Integer.parseInt(regretMove.substring(1, 2)) + 97 /*UTF-16 has 97 for letter 'a' */ );
				inputString = "-" + Integer.parseInt(regretMove.substring( 0, 1 ) ) + Character.toString(toChar[0]);
				game_addToRegretMoves( regretMove );
				break;
			}
			case "forward": {
				if ( ! regretMoves.isEmpty() ) {
					String stringCopy = regretMoves.pop();
					char[] toChar = Character.toChars( Integer.parseInt(stringCopy.substring(1, 2)) + 97 /*UTF-16 has 97 for letter 'a' */ );
					inputString = stringCopy.substring(0, 1) + Character.toString(toChar[0]) + stringCopy.substring(2, 3);
					
				} else {
					System.out.println("no forward action possible");
				}
				break;
			}
			case "quit":
				play = false;
				break;
			}
			if ( inputString.charAt(0) == '-' ) {
				int inputRow = Integer.parseInt( inputString.substring(1,2) );
				int inputColumn = Character.getNumericValue( inputString.charAt(2) ) - 10;
				
				// updates the saveFile
				int entryToBeReplaced = 0;
				try {
					if ( sudokuBoard.getEntry(inputRow, inputColumn) != "." ) {
						entryToBeReplaced = Integer.parseInt(sudokuBoard.getEntry( inputRow, inputColumn ).substring(0, 1) );
						int index = gameMoves.indexOf(Integer.toString(inputRow) + Integer.toString(inputColumn) + Integer.toString(entryToBeReplaced ) );
						gameMoves.remove(index);
					}
				} catch (Exception e){ System.out.println("something went wrong");}
				
				sudokuBoard.sudoku_clearEntry( inputRow, inputColumn );
				
			} else if ( inputString.length() == 3 ) {
				int inputRow = Integer.parseInt(inputString.substring(0, 1));
				int inputColumn = Character.getNumericValue(inputString.charAt(1)) - 10;	//API is being a fuck up here. remove 10.
				int inputValue = Integer.parseInt(inputString.substring(2,3));
				sudokuBoard.sudoku_overwriteEntry(inputRow, inputColumn, inputValue);
				game_addToGameMoves(Integer.toString(inputRow) + Integer.toString(inputColumn) + Integer.toString(inputValue) );
			} else {
				System.out.println("no furher action.");
			} 
			sudokuBoard.checkAnyInconsistentNumber(9, 9);
			game_clearScreen();
			
		}
	}
	static void game_addToGameMoves( String newMove ) {
		gameMoves.add( newMove );
	}
	static void game_addToRegretMoves ( String newMove ) {
		regretMoves.push( newMove );
	}
	static void game_saveGame () throws FileNotFoundException {
		File file = new File ("C:/Users/Mikael-pc/workspace/oop/src/oving7/sudoku/saveFile.txt");
	    PrintWriter printWriter = new PrintWriter ( file );
		for ( int i = 0; i < gameMoves.size(); i++ ) {
			printWriter.println ( gameMoves.get(i) );
		}
		printWriter.close();
	    System.out.println("done");
	}
	
	void game_displayGameInfo(){
		System.out.println("row = [NUM 1 - 9], column = [a - i] value = [NUM 1 - 9]");
		System.out.println("Game is zero-indexed.");
	}
	String game_getSudokuGame(){
		String[] gamePick = {".....2..38.273.45....6..87.9.8..5367..6...1..4513..9.8.84..3....79.512.62..8.....",
				".68.257.3..........71..39..61.35.2...8.....4...3.64.95..76..58..........8.653.42.",
				".....59.4.8..9.6.5..6....3..3.7.145...8.4.7...742.6.9..6....3..8.1.6..7.3.98.....",
				"...6...513....2..66...3..89..4.2.6...3.418.2...8.7.1..59..6...38..3....241...9..."
		};
		Random randomVal = new Random();
		return gamePick[randomVal.nextInt(4)];
	}
	void game_clearScreen() {
		for ( int i = 0; i < 25; i++ ) {
			System.out.println("\n");
		}
	}
	
}