import React from 'react'; import * as gf from '../src/genfuns'; import * as m from './Model'; class Summary { constructor(wrapper = 'span') { this.wrapper = wrapper; } } class Detail { } const total_receipt = items => items.reduce((acc, item) => acc + item.subtotal, 0); const subtotal = items => items.reduce((acc, item) => acc + item.price, 0); const total_tax = items => items.reduce((acc, item) => acc + item.tax, 0); const display_money = amount => amount.toFixed(2); const ItemLabel = ({ desc, amount, wrapper, ...restProps }) => React.createElement(wrapper, restProps, [ <span className="desc" key="0"> {desc}: </span>, <span className="price" key="1">{display_money(amount)}</span> ] ); export const Items = gf.defgeneric("Items", "animaltorender") .primary([gf.Shape("items", "view")], ({ items, view }) => Items(items, view)) .primary([Array, Summary], (items, view) => ( <> <ItemLabel desc="Subtotal" amount={subtotal(items)} wrapper={view.wrapper} /> <ItemLabel desc="Tax" amount={total_tax(items)} wrapper={view.wrapper} /> <ItemLabel desc="Total" amount={total_receipt(items)} wrapper={view.wrapper} /> </> )) .primary([Array, Detail], items => ( <ul> {items.map((a, idx) => <Item item={a} key={idx} />, items)} <Items items={items} view={new Summary('li')} /> </ul> )) .fn; export const Item = gf.defgeneric("Item", "itemtorender") .primary([gf.Shape("item")], ({ item }) => Item(item)) .around([m.Item], function (_) { const [desc, price] = this.call_next_method(); return <ItemLabel desc={desc} amount={price} wrapper='li' />; }) .primary([m.NonFood], item => ["Non-food Item", item.price]) .primary([m.NormalFood], item => ["Food", item.price]) .primary([m.AlcoholicBeverage], item => ["Alcohol", item.price]) .fn; export const Receipt = ({items}) => ( <div> <h1><Items {...{ items }} view={new Summary()} /></h1> <Items {...{ items }} view={new Detail()} /> </div> );