class Equipment {
    private price: number = 0;
    private name: string = '';

    getPrice() {
        return this.price || 0;
    }

    getName() {
        return this.name;
    }

    setName(name: string) {
        this.name = name;
    }

    setPrice(price: number) {
        this.price = price;
    }
}

class Engine extends Equipment {
    constructor() {
        super();
        this.setName('Engine');
        this.setPrice(800);
    }
}

class Body extends Equipment {
    constructor() {
        super();
        this.setName('Body');
        this.setPrice(3000);
    }
}

class Tools extends Equipment {
    constructor() {
        super();
        this.setName('Tools');
        this.setPrice(4000);
    }
}

class Composite extends Equipment {
    private equipments: Equipment[];
    constructor() {
        super();
        this.equipments = [];
    }

    add(equipment: Equipment) {
        this.equipments.push(equipment);
        return this;
    }

    getPrice() {
        return this.equipments
            .map(equipment => equipment.getPrice())
            .reduce((a, b) => a + b);
    }
}

class Car extends Composite {
    constructor() {
        super();
        this.setName('Audi');
    }
}

const myCar = new Car().add(new Engine()).add(new Body()).add(new Tools());

console.log(`${myCar.getName()} price is ${myCar.getPrice()}`);