/*
 * 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) {


            var corridor= 0;

            var exitsInCorridor = (entryPoint) => {
                var exits = 0;

                for (x=me.getX()+1; x<map.getWidth()-1; x++) {
                if(map.getObjectTypeAt(x, entryPoint) === 'block') {
                    break;
                }
                if(map.getAdjacentEmptyCells(x, entryPoint).length > 2) {
                    exits+=1;
                }
                }
                for (x=me.getX()-1; x>0; x--) {
                if(map.getObjectTypeAt(x, entryPoint) === 'block') {
                    break;
                }
                if(map.getAdjacentEmptyCells(x, entryPoint).length > 2) {
                    exits+=1;
                }
                }
                return exits;
            }

            // move randomly
            var moves = map.getAdjacentEmptyCells(me.getX(), me.getY());
            // getAdjacentEmptyCells gives array of ((x, y), direction) pairs

            var nextMove= 'right';

            console.log('length: ', moves.length)


            if(me.getX() === map.getWidth()-2 && me.getY()===9){
            console.log('nearKey');
                nextMove='down';
            }
            else if(moves.length === 1) {
                nextMove = moves[0][1];
            }
            else if(moves.length === 4 ||
            (moves.length === 2 && me.canMove('down'))) {
            console.log('must go down');
                nextMove='down';
                map.placeObject(me.getX(), me.getY(), 'block')
            }
            else if(me.canMove('up')) {
                var exitsUp = exitsInCorridor(me.getY()-2);
                console.log('up: ', exitsUp);
                if (exitsUp === 0) {
                map.placeObject(me.getX(), me.getY()+1, 'block')
                }
                else {
                 nextMove='up';
                }
            }
            else if (me.canMove('down')) {
                var exitsUp = exitsInCorridor(me.getY()+2);
                console.log('down: ', exitsUp);
                if (exitsUp === 0) {
                map.placeObject(me.getX(), me.getY()-1, 'block')
                }
                else {
                 nextMove='down';
                }
            }


            me.move(nextMove);

        }
    });

    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;
    }
}