All files / libs/patterns/src/money account.ts

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import { CurrencyInterface } from "./currency";
import { MoneyInterface } from "./money";
 
export interface AccountInterface {
    getId(): number;
    getBalance(currency: CurrencyInterface): number;
    deposit(monye: MoneyInterface): number;
}
 
export class Account implements AccountInterface {
    protected id: number;
    protected balances: Map<CurrencyInterface, number>;
 
    public constructor(id: number) {
        this.id = id;
        this.balances = new Map<CurrencyInterface, number>();
    }
 
    public getId(): number {
        return this.id;
    }
 
    public getBalance(currency: CurrencyInterface): number {
        return this.balances.has(currency) && null != this.balances.get(currency)
            ? Number(this.balances.get(currency))
            : 0;
    }
 
    public deposit(money: MoneyInterface): number {
        if (!this.balances.has(money.getCurrency())) {
            this.balances.set(money.getCurrency(), 0);
        }
 
        this.balances.set(money.getCurrency(), Number(this.balances.get(money.getCurrency())) + money.getAmount());
 
        return Number(this.balances.get(money.getCurrency()));
    }
 
    public withdraw(money: MoneyInterface): number {
        if (!this.balances.has(money.getCurrency())) {
            throw new Error(`This account has no currency ${money.getCurrency().getStringRepresentation()}`);
        }
 
        if (Number(this.balances.get(money.getCurrency())) < money.getAmount()) {
            throw new Error("Balance is not enough for this withdraw");
        }
 
        this.balances.set(money.getCurrency(), Number(this.balances.get(money.getCurrency())) - money.getAmount());
 
        return Number(this.balances.get(money.getCurrency()));
    }
}