/*
 * robotMaze.js
 *
 * The blue key is inside a labyrinth, and extracting
 * it will not be easy.
 *
 * It's a good thing that you're a AI expert, or
 * we would have to leave empty-handed.
 */

function startLevel(map) {
    // Hint: you can press R or 5 to "rest" and not move the
    // player, while the robot moves around.

    map.getRandomInt = function(min, max) {
        return Math.floor(Math.random() * (max - min + 1)) + min;
    }

    map.placePlayer(map.getWidth()-1, map.getHeight()-1);
    var player = map.getPlayer();

    map.defineObject('robot', {
        'type': 'dynamic',
        'symbol': 'R',
        'color': 'gray',
        'onCollision': function (player, me) {
            me.giveItemTo(player, 'blueKey');
        },
        'behavior': function (me) {

                 // move randomly
            var moves = map.getAdjacentEmptyCells(me.getX(), me.getY());
            // getAdjacentEmptyCells gives array of ((x, y), direction) pairs
            //me.move(moves[map.getRandomInt(0, moves.length - 1)][1]);
            if (typeof( me.direction ) === 'undefined') {
              me.direction = 'up';
              me.dmx = {}
              me.dmx['up'] = [0, -1];
              me.dmx['right'] = [1, 0];
              me.dmx['down'] = [0, 1];
              me.dmx['left'] = [-1, 0];

              me.cwmx = {}
              me.cwmx['up'] = 'right';
              me.cwmx['right'] = 'down';
              me.cwmx['down'] = 'left';
              me.cwmx['left'] = 'up';
              me.ccwmx = {}
              me.ccwmx['up'] = 'left';
              me.ccwmx['right'] = 'up';
              me.ccwmx['down'] = 'right';
              me.ccwmx['left'] = 'down';

                me.getLeft = function() {
                xy = me.dmx[ me.ccwmx[ me.direction ] ];
                //xy = me.dmx[ 'up' ];
                //alert(me.direction+"xy = " + xy[0] + ", " + xy[1]);
                xy = [me.getX() + xy[0], me.getY() + xy[1]];
                r = map.getObjectTypeAt( xy[0], xy[1] );
                //alert("l = " + r + " at " + xy[0] + ", " + xy[1] + ":" + xy);
                return r;
              }
                me.getFront = function() {
                xy = me.dmx[ me.direction ];
                xy = [me.getX() + xy[0], me.getY() + xy[1]];
                r = map.getObjectTypeAt( xy[0], xy[1] );
                //alert("r = " + r + " at " + xy[0] + ", " + xy[1]);
                return r;
              }
            }
            if ('empty' === me.getLeft()) {
              // turn left
              me.direction = me.ccwmx[ me.direction ];
            } else if ('empty' !== me.getFront() &&
                       'barrier' !== me.getFront()) {
              // turn right
              console.log('front = '+me.getFront());
              me.direction = me.cwmx[ me.direction ];
            }
            me.move( me.direction );




        }
    });

    map.defineObject('barrier', {
        'symbol': '░',
        'color': 'purple',
        'impassable': true,
        'passableFor': ['robot']
    });

    map.placeObject(0, map.getHeight() - 1, 'exit');
    map.placeObject(1, 1, 'robot');
    map.placeObject(map.getWidth() - 2, 8, 'blueKey');
    map.placeObject(map.getWidth() - 2, 9, 'barrier');

    var autoGeneratedMaze = new ROT.Map.DividedMaze(map.getWidth(), 10);
    autoGeneratedMaze.create( function (x, y, mapValue) {
        // don't write maze over robot or barrier
        if ((x == 1 && y == 1) || (x == map.getWidth() - 2 && y >= 8)) {
            return 0;
        } else if (mapValue === 1) { //0 is empty space 1 is wall
            map.placeObject(x,y, 'block');
        } else {
            map.placeObject(x,y,'empty');
        }
    });
}

function validateLevel(map) {
    map.validateExactlyXManyObjects(1, 'exit');
    map.validateExactlyXManyObjects(1, 'robot');
    map.validateAtMostXObjects(1, 'blueKey');
}

function onExit(map) {
    if (!map.getPlayer().hasItem('blueKey')) {
        map.writeStatus("We need to get that key!");
        return false;
    } else {
        return true;
    }
}