/**
 * FACTORY METHOD 2
 */

abstract class PrepaymentCreator {
    public abstract prepaymentFactory(): IPrepayment;

    public addToDb(): string {
        const prepayment = this.prepaymentFactory();

        return `ABSTRACT FACTORY: The prepayment for  ${prepayment.getDate()} with amount ${prepayment.getAmount()} has been saved to database.`;
    }

    public getDate(): string {
        const prepayment = this.prepaymentFactory();

        const month = prepayment.getDate().split('.')[0];
        const year = prepayment.getDate().split('.')[1];

        return `ABSTACT FACTORY: Month is ${month}, year is ${year}`;
    }
}

interface IPrepayment {
    getAmount(): number;
    getDate(): string;
}

class ConcretePrepayament extends PrepaymentCreator {
    constructor(
        amount: number,
        date: string
    ) {
        super();
        this.amount = amount;
        this.date = date;
    }

    private amount: number;
    private date: string;

    public prepaymentFactory(): IPrepayment {
        return new Prepayment(this.amount, this.date);
    }
}

class Prepayment implements IPrepayment {
    constructor(
        amount: number,
        date: string
    ) {
        this.amount = amount;
        this.date = date;
    }

    private amount: number;
    private date: string;

    public getAmount(): number {
        return this.amount;
    }

    public getDate(): string {
        return this.date;
    }
}


/**
 * CLIENT CODE
 */

const prepayment = new ConcretePrepayament(10000, '04.2019');

console.log(prepayment.addToDb());
console.log(prepayment.getDate());