Naive Bruteforce Implementation for Mortal Coil

hacker_coil.js

var username = "";
var password = "";
var DEBUG = false;

function request(x, y, path){
    var params = typeof x=="undefined" ? "": `&x=${x}&y=${y}&path=${path}`;
    // yeah yeah, I don't care about my account :P
    return $.get(`http://crossorigin.me/http://www.hacker.org/coil/index.php?name=${username}&password=${password}` + params);
}

function parse(res){
    var parts = $(res).find("param[name=FlashVars]").val()
    	.split("&");
    var x, y, boardStr;
    for(var i = 0; i < parts.length; i++){
        var param = parts[i].split("=");
        if(param[0] == "x") x = parseInt(param[1]);
        if(param[0] == "y") y = parseInt(param[1]);
        if(param[0] == "board") boardStr = param[1];
    }
    var board = [];
    for(var j = 0; j < y; j++){
        var arr = [];
        for(var k = 0; k < x; k++){
            arr.push(boardStr[j*x + k]);
        }
        board.push(arr);
    }
    return board;
}

function get(board, x, y){
    return board[y][x];
}

function log(){
    if(DEBUG){
        console.log.apply(console, arguments);
    }
}

function set(board, x, y, c){
    board[y][x] = c;
}

function clone(board){
    return $.extend(true, [], board);
}

function validate(board){
    var boardStr = board.map(e=>e.join("")).join("");
    log("Board string", boardStr);
    return boardStr.split(".").length == 1;
}

function replay(board, x, y, dirStr){
    log(board.map(e=>e.join('')).join('\n'));
    for(dir of [...dirStr]){
        log(dir);
        while(x >= 0 && x < board[0].length && y >= 0 && y < board.length && get(board, x, y) == "."){
            set(board, x, y, "C");
        	x = x + (dir == "R") - (dir == "L");
    		y = y + (dir == "D") - (dir == "U");
            log(x, y);
    	}
    
    	x = x - (dir == "R") + (dir == "L");
		y = y - (dir == "D") + (dir == "U");
        set(board, x, y, ".");
        log(x, y);
        log(board.map(e=>e.join('')).join('\n'));
    }
}

function step(board, x, y, dir, dirs){
    log(`=======Level ${dirs.length}=======`, arguments);
    dirs.push(dir);
    board = clone(board);
    var x1 = x + (dir == "R") - (dir == "L");
    var y1 = y + (dir == "D") - (dir == "U");
    log("New pos", x1, y1);
    if(x1 < 0 || x1 >= board[0].length || y1 < 0 || y1 >= board.length || get(board, x1, y1) != "."){
        log("Invalid move, checking board");
        if(validate(board)){
            log("valid!");
            return dirs.slice(0, dirs.length - 1);
        } else {
            log("Not valid");
            dirs.pop();
            return false;
        }
    }
    log("dir is", dir);
    while(x1 >= 0 && x1 < board[0].length && y1 >= 0 && y1 < board.length && get(board, x1, y1) == "."){
        set(board, x1, y1, "C");
        x1 = x1 + (dir == "R") - (dir == "L");
    	y1 = y1 + (dir == "D") - (dir == "U");
        log(x1, y1);
    }
    
    x1 = x1 - (dir == "R") + (dir == "L");
	y1 = y1 - (dir == "D") + (dir == "U");
    
    log("board is now", JSON.stringify(board));
    
    for(var dir1 of [..."LRDU"]){
        var res = step(board, x1, y1, dir1, dirs);
        if(!res){
            
        } else {
            return res;
        }
    }
    
    dirs.pop();
    return false;
}

//replay(JSON.parse('[[".",".",".",".","."],[".","X",".",".","."],[".",".",".","X","."]]'), 2, 0, "LDRURUL");

var lvlCount = 1;

function go(res){
    var board = parse(res);
    var solution = {x:-1, y:-1, steps:[]};
    outer:
    for(var x = 0; x < board[0].length; x++){
        for(var y = 0; y < board.length; y++){
            if(get(board, x, y) != ".") continue;
            for(var dir1 of [..."LRDU"]){
                var board0 = clone(board);
            	set(board0, x, y, "C");
        		var res = step(board0, x, y, dir1, []);
                if(res !== false){
                    solution.x = x;
                    solution.y = y;
                    solution.steps = res;
                    break outer;
                }
            }
        }
    }
    log(solution);
    request(solution.x, solution.y, solution.steps.join("")).then(function(res0){
        if(res0.contains("sucked")){
            console.warn("LEVEL FAILED!");
        } else {
            console.info("Completed ", ++lvlCount, " levels");
            setTimeout(function(){
                go(res0);
            }, 1);
        }
    });
}

request().then(go);