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export interface MoneyInterface {
getAmount(): number;
getCurrency(): CurrencyInterface;
add(money: MoneyInterface): number;
substract(money: MoneyInterface): number;
multiply(multiplier: number): number;
divide(divider: number): number;
isEqualTo(money: MoneyInterface): boolean;
greaterThan(money: MoneyInterface): boolean;
greaterOrEqualThan(money: MoneyInterface): boolean;
lowerThan(money: MoneyInterface): boolean;
lowerOrEqualThan(money: MoneyInterface): boolean;
}
export class Money implements MoneyInterface {
protected amount: number;
protected currency: CurrencyInterface;
private readonly sameCurrencyError: string = "Operation is only permitted on same currency";
private readonly amountTooLowError: string = "Operation not possible, amount is not enough";
private readonly dividerShouldBeGreatherThanZero: string =
"Operation not possible, divider should be greater than 0";
public constructor(amount: number, currency: CurrencyInterface) {
this.amount = amount;
this.currency = currency;
}
public getAmount(): number {
return this.amount;
}
public getCurrency(): CurrencyInterface {
return this.currency;
}
public add(money: MoneyInterface): number {
this.checkCurrencies(this.currency, money.getCurrency());
this.amount += money.getAmount();
return this.amount;
}
public substract(money: MoneyInterface): number {
this.checkCurrencies(this.currency, money.getCurrency());
if (money.getAmount() > this.amount) {
throw new Error(this.amountTooLowError);
}
this.amount -= money.getAmount();
return this.amount;
}
public multiply(multiplier: number): number {
this.amount *= multiplier;
return this.amount;
}
public divide(divider: number): number {
if (divider <= 0) {
throw new Error(this.dividerShouldBeGreatherThanZero);
}
this.amount /= divider;
return this.amount;
}
public isEqualTo(money: MoneyInterface): boolean {
return this.amount === money.getAmount() && this.currency === money.getCurrency();
}
public greaterThan(money: MoneyInterface): boolean {
return this.amount > money.getAmount();
}
public greaterOrEqualThan(money: MoneyInterface): boolean {
return this.amount >= money.getAmount();
}
public lowerThan(money: MoneyInterface): boolean {
return this.amount < money.getAmount();
}
public lowerOrEqualThan(money: MoneyInterface): boolean {
return this.amount <= money.getAmount();
}
private checkCurrencies(currency1: CurrencyInterface, currency2: CurrencyInterface): void {
if (currency1 !== currency2) {
throw new TypeError(this.sameCurrencyError);
}
}
}
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