PliWould/lib/product.ts

import {length as en_length, area as en_area} from "enheter"
import {Measure, LengthUnit, AreaUnit, } from "enheter"
import uuid from "react-native-uuid";
export type Id = string;

export type Currency = "USD";

export const CURRENCY_SYMBOLS : Map<"USD", string> = {
    "USD": "$",
};

export class Price {
    constructor(public currency : Currency, public value : number) {}
    public toString() {
        const sym = CURRENCY_SYMBOLS.get(this.currency);
        return `${sym} ${Math.round(this.value)}`;
    }
}

export type ProductAttributes = {
    id?: string,
    name?: string,
    image?: string,
    description?: string,
    depth?: string,
    currency?: Currency,
    [key:string]: any,
}

export class Product {
    public id : string;
    constructor(public pricePerUnit : number, public measurement : Measure<"length" | "area">, public attributes : ProductAttributes = {}) {
        this.id = attributes.id || uuid.v4().toString();
    }

    public priceFor(measurement : Measure<"length" | "area">): number {
        const ratio = measurement.convertTo(this.measurement.unit).divideBy(this.measurement).value;
        return this.pricePerUnit * ratio
    }

    get isArea() {
        return this.measurement.unit.dimension.length === 2;
    }

    get isLength() {
        return this.measurement.unit.dimension.length === 1;
    }

    get attributesAsList() {
        return Object.entries(this.attributes).map(([key, value]) => {
            return {key, value}
        })
    }

    public removeAttribute(key : string) {
        delete this.attributes[key]
    }
}