131 lines
3.2 KiB
TypeScript
131 lines
3.2 KiB
TypeScript
import { Result } from "@repo/rdx-utils";
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import * as z from "zod/v4";
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import { ValueObject } from "./value-object";
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const DEFAULT_SCALE = 2;
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const DEFAULT_MIN_SCALE = 0;
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const DEFAULT_MAX_SCALE = 2;
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export interface QuantityProps {
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amount: number;
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scale: number;
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}
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export class Quantity extends ValueObject<QuantityProps> {
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protected static validate(values: QuantityProps) {
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const schema = z.object({
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amount: z.number().int(),
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scale: z.number().int().min(Quantity.MIN_SCALE).max(Quantity.MAX_SCALE),
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});
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return schema.safeParse(values);
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}
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static DEFAULT_SCALE = DEFAULT_SCALE;
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static MIN_SCALE = DEFAULT_MIN_SCALE;
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static MAX_SCALE = DEFAULT_MAX_SCALE;
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static create({ amount, scale }: QuantityProps) {
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const props = {
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amount: Number(amount),
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scale: scale ?? Quantity.DEFAULT_SCALE,
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};
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const checkProps = Quantity.validate(props);
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if (!checkProps.success) {
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return Result.fail(new Error(checkProps.error.issues[0].message));
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}
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return Result.ok(new Quantity({ ...(checkProps.data as QuantityProps) }));
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}
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get amount(): number {
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return this.props.amount;
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}
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get scale(): number {
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return this.props.scale;
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}
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getValue(): QuantityProps {
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return this.props;
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}
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toPrimitive() {
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return this.getValue();
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}
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toNumber(): number {
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return this.amount / 10 ** this.scale; // ** => Math.pow
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}
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toString(): string {
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return this.toNumber().toFixed(this.scale);
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}
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isZero(): boolean {
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return this.amount === 0;
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}
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isPositive(): boolean {
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return this.amount > 0;
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}
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isNegative(): boolean {
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return this.amount < 0;
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}
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increment(anotherQuantity?: Quantity): Result<Quantity, Error> {
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if (!anotherQuantity) {
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return Quantity.create({
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amount: Number(this.amount) + 1,
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scale: this.scale,
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});
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}
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if (!this.hasSameScale(anotherQuantity)) {
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return Result.fail(Error("No se pueden sumar cantidades con diferentes escalas."));
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}
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return Quantity.create({
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amount: Number(this.amount) + Number(anotherQuantity.amount),
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scale: this.scale,
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});
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}
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decrement(anotherQuantity?: Quantity): Result<Quantity, Error> {
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if (!anotherQuantity) {
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return Quantity.create({
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amount: Number(this.amount) - 1,
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scale: this.scale,
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});
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}
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if (!this.hasSameScale(anotherQuantity)) {
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return Result.fail(Error("No se pueden restar cantidades con diferentes escalas."));
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}
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return Quantity.create({
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amount: Number(this.amount) - Number(anotherQuantity.amount),
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scale: this.scale,
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});
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}
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hasSameScale(otherQuantity: Quantity): boolean {
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return this.scale === otherQuantity.scale;
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}
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convertScale(newScale: number): Result<Quantity, Error> {
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if (newScale < Quantity.MIN_SCALE || newScale > Quantity.MAX_SCALE) {
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return Result.fail(new Error(`Scale out of range: ${newScale}`));
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}
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const oldFactor = 10 ** this.scale; // ** => Math.pow
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const value = Number(this.amount) / oldFactor;
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const newFactor = 10 ** newScale; // ** => Math.pow
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const newValue = Math.round(value * newFactor);
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return Quantity.create({ amount: newValue, scale: newScale });
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}
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}
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