99 lines
2.6 KiB
TypeScript
99 lines
2.6 KiB
TypeScript
import uuid from "react-native-uuid";
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import convert, { Area, Length } from "convert";
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export type Id = string;
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export type Currency = "USD";
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export type ProductAttributes = {
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id?: string,
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name?: string,
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image?: string,
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description?: string,
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depth?: string,
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currency?: Currency,
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// [index:string]: any,
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}
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export type ProductData = {
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id?: Id,
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pricePerUnit: number,
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measurement: {
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unit: string,
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value: number,
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dimension: number,
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},
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attributes?: ProductAttributes,
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};
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export type length_t = {
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l: number, u: Length
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}
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export type area_t = length_t & {
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w: number,
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}
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export type dimensions_t = area_t | length_t;
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export type product_type_t = "area" | "length";
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export const isArea = (d: dimensions_t) => ("width" in d);
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export const isLength = (d: dimensions_t) => (!("width" in d));
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export const dimensionType = (d: dimensions_t) => isArea(d) ? "area" : "length"
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export class Product {
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public id: string;
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public area?: area_t;
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public length?: length_t;
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public presentUnits: Length;
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constructor(public pricePerUnit: number, dimensions: dimensions_t, public attributes: ProductAttributes = {},) {
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this.id = attributes.id || uuid.v4().toString();
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this.presentUnits = dimensions.u;
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if ("w" in dimensions) {
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this.area = {
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l: convert(dimensions.l, dimensions.u).to("meter"),
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w: convert(dimensions.w, dimensions.u).to("meter"),
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u: "meter"
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}
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} else {
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this.length = {
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l: convert(dimensions.l, dimensions.u).to("meter"),
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u: "meter"
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};
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}
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}
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public priceFor(dimensions: dimensions_t): number {
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if (this.area && "w" in dimensions) {
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const thisA = this.area.l * this.area.w;
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const otherA = convert(
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dimensions.w,
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dimensions.u
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).to("meter") * convert(
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dimensions.l,
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dimensions.u
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).to("meter");
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return (otherA / thisA) * this.pricePerUnit;
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} if (this.length) {
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const thisL = this.length.l;
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const otherL = convert(
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dimensions.l,
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dimensions.u
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).to("meter");
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return (otherL / thisL) * this.pricePerUnit;
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}
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throw new Error(`Invalid dimensions: ${dimensions}`);
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}
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get attributesAsList() {
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return Object.entries(this.attributes).map(([key, value]) => {
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return { key, value }
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})
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}
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public removeAttribute(key: string) {
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delete this.attributes[key];
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}
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} |