var FactorySystem = {};

FactorySystem = {};

FactorySystem._weightedChoice = function(list) {    
    var elegibleData = [];
    var totalWeight = 0;

    var levelScore = registry.levelScore;
    
    for (var i=0; i<list.length; i++) {
        var element = list[i];
        if (element.minscore <= levelScore) {
            elegibleData.push(element);
            totalWeight += element.weight;
        }
    }

    var ticket = Math.random()*totalWeight;
    var m_ticket = 0;

    for (var i=0; i<elegibleData.length; i++) {
        m_ticket += elegibleData[i].weight;
        if (ticket < m_ticket) {
            return elegibleData[i];
        }
    }

    return null;
}

FactorySystem.createCreep = function() {
    var creepData = FactorySystem._weightedChoice(CREEPS);

    var min_x = 20;
    var max_x = canvas.width-20;

    var creep = new Creep(creepData);
    creep.x = Math.random()*(max_x-min_x) + min_x;
    creep.y = canvas.height-30;
    creep.alpha = 0;

    createjs.Tween.get(creep).to({alpha:1}, 2000);

    return creep;
}

FactorySystem.createBullet = function() {
    var weapon = registry.levelShipWeapons[registry.levelShipWeapons.length-1];
    var weaponData = weapon.data;

    var bullet = new Bullet(weaponData);
    bullet.x = registry.levelShip.x;
    bullet.y = registry.levelShip.y + bullet.image.height/2;

    weapon.ammunition -= 1;
    weapon.heat = creatine.clip(weapon.heat+weapon.cooldown, 0, WEAPONS_MAX_HEAT);

    return bullet;
}

FactorySystem.createWeaponBox = function() {
    var weaponData = FactorySystem._weightedChoice(WEAPONS);

    if (!weaponData)
        return null;

    var min_x = 20;
    var max_x = canvas.width-20;

    var weapon = new createjs.Bitmap(loader.getResult(weaponData.box));
    weapon.hw = weapon.image.width/2
    weapon.hh = weapon.image.height/2
    weapon.regX = weapon.hw;
    weapon.regY = weapon.hh;
    weapon.x = Math.random()*(max_x-min_x) + min_x;
    weapon.y = -WEAPONBOX_SPEED;
    weapon.data = weaponData;

    return weapon;
}