Pricing service

Usage

The whole thing is based on the MoneyAmount class that is used to represent financial amounts.

const { MoneyAmount } = require("./pricing")

// Financial amounts are represented by the class MoneyAmount
let price = new MoneyAmount(1.02)
// Money amounts can be rounded to n centimes (here 5)
console.log(price.round(5)) // 1.02 => 1
// and converted to display format string
console.log(price.display(5)) // 1.02 => 1 => '1.00'

// Money amounts can be added together
const p1 = new MoneyAmount(1.02)
const p2 = new MoneyAmount(2.07)
console.log(p1 + p2) // 3.09

// to be able to further work with the sum as a MoneyAmount, use the MoneyAmount constructor
const total = new MoneyAmount(p1 + p2)
console.log(total.display()) // 3.09 => ... => '3.10'

ProductVariantPrice class

To hande product prices, instantiate the ProductVariantPrice class passing the grossCostPrice as an argument. All other conversions can then be accessed automatically through properties that are automatically updated accordingly.

const {PricingPolicy, ProductVariantPrice} = require("./pricing")

const price = new ProductVariantPrice(12.532)
price.round(centimes=1) // 12.53
price.round(centimes=5) // 12.55
price.producerIncomeInclVat.round() // 12.532 * 0.85
price.budzonneryIncomeInclVat.round() // 12.532 * 0.15
price.rexIncomeInclVat.round() // 12.532 * 0.05

The properties are also writable an will affect the property grossCostPrice which all other properties are based upon:

const {PricingPolicy, ProductVariantPrice} = require("./pricing")

const price = new ProductVariantPrice(100)
price.round() // 100.00
price.rexIncomeInclVat.round() // 5.00
price.producerIncomeInclVat = 120
// all prices are automagically recomputed
price.rexIncomeInclVat.round() // = 120 / 0.85 * 0.05 = 7.06

Custom pricing policy

The same can be done with a custom earning shares policy

const {PricingPolicy, ProductVariantPrice} = require("./pricing")

const customPricingPolicy = new PricingPolicy(
    managerIncomeRate=0.04,
    rexIncomeRate=0.06, 
    softozorIncomeRate=0.07
)
console.log(customPricingPolicy.budzonneryIncomeRate) // 0.17
console.log(customPricingPolicy.rexIncomeRate) // 0.06

const price2 = new ProductVariantPrice(100, customPricingPolicy)
console.log(price2.budzonneryIncomeInclVat.round()) // 17
console.log(price2.producerIncomeInclVat.round()) // 83
console.log(price2.rexIncomeInclVat.round()) // 6