class CosmeticItem {
    static SLOTS_ENUM: any = {
        HAT: 0,
        HAIR: 1,
        EYES: 2
    };

    protected slotId: number = 0;

    public getSlotId() {
        return this.slotId;
    }
}


class CosmeticSlots {

    slots: CosmeticItem[] = [];

    hatSlot: CosmeticItem = null;
    hairSlot: CosmeticItem = null;
    eyesSlot: CosmeticItem = null;


    _addItemToSlot(slotId: number, item: CosmeticItem) {
        if (slotId == CosmeticItem.SLOTS_ENUM.HAT) {
            this.hatSlot = item;
        }
        else if (slotId == CosmeticItem.SLOTS_ENUM.HAIR) {
            this.hairSlot = item;
        }
        else if (slotId == CosmeticItem.SLOTS_ENUM.EYES) {
            this.eyesSlot = item;
        }
        this.slots.push(item);
    }

    //removeItemFromSlot

    addItem(item: CosmeticItem) {
        this._addItemToSlot(item.getSlotId(), item);
    }

    //removeItem

    getItems(): CosmeticItem[] {
        return this.slots;
    }

    getSlot(slotId: number) {
        if (slotId == CosmeticItem.SLOTS_ENUM.HAT) {
            return this.hatSlot;
        }
        else if (slotId == CosmeticItem.SLOTS_ENUM.HAIR) {
            return this.hairSlot;
        }
        else if (slotId == CosmeticItem.SLOTS_ENUM.EYES) {
            return this.eyesSlot;
        }
        return null;
    }
}


class CosmeticHat extends CosmeticItem {
    name: string = "";
    someHatSpecificThing: number = 9999;

    constructor(name: string = "") {
        super();
        this.slotId = CosmeticItem.SLOTS_ENUM.HAT;
        this.name = name;
    }
}


var mySlots: CosmeticSlots = new CosmeticSlots();

var myHat: CosmeticHat = new CosmeticHat("super duper hat of ownage");

mySlots.addItem(myHat);

mySlots.getSlot(CosmeticItem.SLOTS_ENUM.HAT); //returns the hat