(function() {
"use strict";

var FactorySystem = function() {
    this.initialize();
}
var p = FactorySystem.prototype = new creatine.System();

    p.initialize = function() {

    }

    p._getSpawnArea = function() {
        var positions = [];
        var spawn = registry.map.getLayerByName('area_spawn');
        for (var x=0; x<spawn.width; x++) {
            for (var y=0; y<spawn.height; y++) {
                if (getTile(spawn, x, y)) {
                    var cx = x*registry.map.tileWidth;
                    var cy = y*registry.map.tileHeight;
                    positions.push([cx, cy]);
                }
            }
        }
        return positions;
    }

    p.createSheeps = function(amount, ignoreRespawn) {
        var sheeps = [];
        var positions = this._getSpawnArea();

        for (var i=0; i<amount; i++) {
            var sheep = new SheepEntity();

            if (ignoreRespawn) {
                sheep.display.x = Math.random()*800;
                sheep.display.y = Math.random()*600;
            } else {
                var pos = positions[getRandomInt(0, positions.length-1)];
                sheep.display.x = pos[0] + Math.random()*registry.map.tileWidth;
                sheep.display.y = pos[1] + Math.random()*registry.map.tileHeight;
            }

            sheeps.push(sheep);
            // this.layerObject.addChild(sheep.display);
        }
        
        return sheeps;
    }

    p.createPredator = function(boids, fdelta) {
        if (registry.wolfSpawnCooldown > 0) {
            registry.wolfSpawnCooldown -= fdelta;
            return;
        }

        for (var i=0; i<boids.length; i++) {
            var b = boids[i];
            var tx = toCoordX(b.display.x);
            var ty = toCoordY(b.display.y);
            var enemy = registry.map.getLayerByName('area_enemy');

            if (getTile(enemy, tx, ty) && Math.random()<WOLF_SPAWN_CHANCE) {
                registry.wolfSpawnCooldown = WOLF_SPAWN_COOLDOWN;
                var wolf = new WolfEntity();
                var predator = wolf.getComponent('Predator');
                predator.target = b;
                

                if (b.display.x < canvas.width/3) {
                    predator.spawnX = -50;
                } else if (b.display.x > 2*canvas.width/3){
                    predator.spawnX = canvas.width+50;
                } else {
                    predator.spawnX = b.display.x;
                }

                if (b.display.y < canvas.height/3) {
                    predator.spawnY = -50;
                } else if (b.display.y > 2*canvas.height/3){
                    predator.spawnY = canvas.height+50;
                } else {
                    predator.spawnY = b.display.y;
                }

                wolf.display.x = predator.spawnX;
                wolf.display.y = predator.spawnY;

                return wolf;
            }
        }

        return;
    }

window.FactorySystem = FactorySystem;

})();