let checkLine = function (color, board, y, x, length){
    if (length === 4){
        return true;
    } else if(y === board.length || x === board[1].length){
        return false
    }
    else if(board[y][x+1] === color){
        return checkLine(color, board,y, x+1, length + 1)
    } else {
        return false;
    }
}
let checkDownRight = function (color,board, y, x, length){
    if (length === 4){
        return true;
    } else if((y + 1) === board.length || (x + 1) === board[1].length){
        return false
    }
    else if(board[y+1][x+1] === color){
        return checkDownRight(color,board,y + 1, x + 1, length + 1)
    } else {
        return false;
    }
}
let checkDownLeft = function (color,board, y, x, length){
    if (length === 4){
        return true;
    } else if((y + 1) === board.length || (x - 1)< 0){
        return false
    }
    else if(board[y+1][x-1] === color){
        return checkDownLeft(color,board,y + 1, x - 1, length + 1)
    } else {
        return false;
    }
}

let checkDown = function (color,board, y, x, length){
    if (length === 4){
        return true;
    } else if((y + 1)=== board.length){
        return false
    }
    else if(board[y + 1][x] === color){
        return checkDown(color,board,y + 1, x, length + 1)
    } else {
        return false;
    }
}


let connect4Winner = function (color, board) {
    for(let y = 0; y < board.length; y++){
        for(let x = 0; x < board[y].length; x++){
            if(board[y][x] === color){
                if (checkLine(color,board,y,x,1) || checkDown(color,board,y,x,1) || checkDownRight(color,board,y,x,1) || checkDownLeft(color,board,y,x,1)){
                    console.log('win')
                    return true;
                }
            }
        }
    }
    return false;
}


module.exports = { connect4Winner }