//data-location: Row, Height from the Top Left Corner! Starts at 1
"use strict";
var ISRED = true;
//var PieceTypes = ['Pawn','Castle','Knight','Bishop','Queen','King','Bishop','Knight','Castle'];
var PieceTypes = ['♟','♖','♘','♗','♕','♔','♗','♘','♖'];
//K-King,R-Rook/Castle,N-Knight,B-Bishop
var g_Player = ['black','white'];
var Click = (function(){
var counter=0;
return function(){return counter+=1;}})(); //Closure statements that counts the number of clicks
var PieceSelected;
var PieceSelectedId;
var chessState = [];
function startGame()
{
var chessBoard = "
";
var headers = "";
var chessBoardRows = "";
var chessBoardRow = "";
var isRed = true;
var color = 'red';
var pieceName = '';
for(var i=1;i<=8;i++){
headers += "
"+i+"
";
for(var j=1;j<=8;j++)
{
if(i == 2 || i== 7) //Second Row of Chess Pieces// Pawns
{
pieceName = g_Player[(i-1)%6]+PieceTypes[0];
}else
if(i==1 || i==8){ //First Row Find a way to swap the order between king and queen for i=8 i==8&&j==5?4;
pieceName = g_Player[i%8]+PieceTypes[j];
}else
{
pieceName = '';
}
chessState[i-1] = [];
chessState[i-1][j-1] = pieceName;
color = cellColor(isRed);
chessBoardRow += "
";
document.getElementById("test1").innerHTML = chessBoard;
} //Check using the splice method to swap them out
function button(row,height,color,pieceName)
{
var location = "'"+row+"_"+height+"'";
var javaMethodName = "btnPressed("+row+","+height+")";
var string_Button = "";
return string_Button;
}
function cellColor(p1){
var clr = 'black';
if(ISRED)
{
clr = 'red';
}
ISRED = !ISRED;
return clr;
}
function nextLine(p1,row)
{
ISRED = !ISRED;
row = "
"+p1+"
" + row;
return row;
}
var chessPieceSelected = {row:-1, column: -1,type:"",id:"",player:""};
function btnPressed(row,column)
{
//1= first Click 2=SecondClick
var turn = Click()%2;
var id = row+"_"+column;
var btn = document.getElementById(id);
//First Click Save the Button Name and state
if(turn == 1){
chessPieceSelected.type = btn.innerHTML;
chessPieceSelected.id = id;
chessPieceSelected.row = row;
chessPieceSelected.column = column;
}else
{
if(validateMove(row,column))
{
document.getElementById(chessPieceSelected.id).innerHTML = ""; //move the piece
btn.innerHTML = chessPieceSelected.type;
}else
{
window.alert("Error: Invalid Move");
}
}
}
function validateMove(row,column){
var pieceType = getPieceType(chessPieceSelected.type);
var isValid = false;
var isTopPlayer;
switch(pieceType)
{
case PieceTypes[0]: //Pawn
isTopPlayer = getPlayerColor(chessPieceSelected.type) === 'white';
isValid = PawnValidMoves(chessPieceSelected.row,chessPieceSelected.column,row,column,isTopPlayer);
break;
case PieceTypes[2]: //Knight
isValid = HorseValidMoves(chessPieceSelected.row,chessPieceSelected.column,row,column);
break;
case PieceTypes[1]://Rook
isValid = CastleValidMoves(chessPieceSelected.row,chessPieceSelected.column,row,column);
break;
case PieceTypes[3]: //Bishop
isValid = BishopValidMoves(chessPieceSelected.row,chessPieceSelected.column,row,column);
break;
case PieceTypes[4]: //Queen
isValid = QueenValidMoves(chessPieceSelected.row,chessPieceSelected.column,row,column);
break;
case PieceTypes[5]: //King
isValid = KingValidMoves(chessPieceSelected.row,chessPieceSelected.column,row,column);
break;
}
return isValid;
}
//ChessPieces Validations - SingleMove and DoubleMove Forward
function PawnValidMoves(rowBefore,columnBefore, rowAfter,columnAfter,isTopPlayer)
{
var i = -1;
var doubleSpace = NaN;
if(isTopPlayer){
i = 1;
}
if (rowBefore === 2 || rowBefore === 7 )
{
doubleSpace = i*2;
}
return ((rowBefore+i) === rowAfter || (rowBefore+doubleSpace === rowAfter)) && columnBefore === columnAfter;
}
function HorseValidMoves(rowBefore,columnBefore, rowAfter,columnAfter)
{
var shortDistanceSquarted = Pythagores(rowBefore,columnBefore,rowAfter,columnAfter);
return shortDistanceSquarted === 5;
}
function CastleValidMoves(rowBefore,columnBefore,rowAfter,columnAfter)
{
return (rowBefore === rowAfter && columnBefore !== columnAfter) || (rowBefore !== rowAfter && columnBefore === columnAfter);
}
function BishopValidMoves(rowBefore,columnBefore,rowAfter,columnAfter)
{
return Math.abs(rowAfter-rowBefore) === Math.abs(columnAfter-columnBefore);
}
function QueenValidMoves(rowBefore,columnBefore,rowAfter,columnAfter)
{
return BishopValidMoves(rowBefore,columnBefore,rowAfter,columnAfter) || CastleValidMoves(rowBefore,columnBefore,rowAfter,columnAfter);
}
function KingValidMoves(rowBefore,columnBefore,rowAfter,columnAfter)
{
var queenValidMove = QueenValidMoves(rowBefore,columnBefore,rowAfter,columnAfter);
return queenValidMove && (Math.abs(rowAfter - rowBefore) <= 1 && Math.abs(columnAfter - columnBefore) <=1)
}
//Helper Functions
function Pythagores(x1,y1,x2,y2)
{
return Math.pow((x1-x2),2) + Math.pow((y1-y2),2);
}
function bothTypes(typeIndex, pieceType)
{
return (g_Player[0]+PieceTypes[typeIndex]) === pieceType || (g_player[typeIndex]+PieceTypes[i]) === pieceType;
}
function getPieceType(pieceName)
{
return pieceName.substring(pieceName.length-8,pieceName.length-7);
}
function getPlayerColor(pieceName){
return pieceName.substring(pieceName.length-13,pieceName.length-8);
}