pruncalc/ts/buy.ts

document.querySelector("#fetch")!.addEventListener("click", async () => {
	const username = (document.querySelector("#username") as HTMLInputElement).value;
	const apiKey = (document.querySelector("#api-key") as HTMLInputElement).value;
	const supplyForDays = parseInt((document.querySelector("#days") as HTMLInputElement).value, 10);
	const output = await calculate(username, apiKey, supplyForDays);
	console.log(output);
});

async function calculate(username: string, apiKey: string, supplyForDays: number): Promise<void> {
	const [prices, planets, warehouse, {bids, orders}] = await Promise.all([
		getPrices(),
		getPlanets(username, apiKey),
		warehouseInventory(username, apiKey),
		getBids(username, apiKey)
	]);
	const buy = new Map<string, number>();
	for (const planet of planets)
		for (const [mat, amount] of planet.supplyForDays(supplyForDays))
			buy.set(mat, (buy.get(mat) ?? 0) + amount);

	// what's left to buy
	const materials: Material[] = [];
	for (const [mat, amount] of buy) {
		const remaining = Math.max(amount - (bids.get(mat) ?? 0) - (warehouse.get(mat) ?? 0), 0);
		const price = prices.get(mat);
		if (!price || price.Bid === null || price.Ask === null) {
			console.log(mat, 'has no bid/ask');
			continue;
		}
		const spread = price.Ask - price.Bid;
		materials.push({
			ticker: mat,
			amount,
			bids: bids.get(mat) ?? 0,
			warehouse: warehouse.get(mat) ?? 0,
			spread,
			savings: spread * remaining,
		});
	}
	materials.sort((a, b) => b.savings - a.savings);

	const tbody = document.querySelector("tbody")!;
	tbody.innerHTML = '';
	const format= new Intl.NumberFormat(undefined, {maximumFractionDigits: 0}).format;
	for (const m of materials) {
		const tr = document.createElement("tr");
		const buyAmount = Math.max(m.amount - m.bids - m.warehouse, 0);
		tr.innerHTML = `
			<td>${m.ticker}</td>
			<td>${format(m.amount)}</td>
			<td>${format(m.bids)}</td>
			<td>${format(m.warehouse)}</td>
			<td>${format(buyAmount)}</td>
			<td>${format(m.spread)}</td>
			<td>${format(m.savings)}</td>
		`;
		tbody.appendChild(tr);
	}

	// deposits of current bids
	orders.sort((a, b) => (b.Limit * b.Amount) - (a.Limit * a.Amount));
	for (const order of orders) {
		const deposit = order.Limit * order.Amount;
		console.log(`${order.MaterialTicker.padEnd(4)} ${deposit}\n`);
	}
}

async function getPrices() {
	const rawPrices= await fetch('https://refined-prun.github.io/refined-prices/all.json').then(r => r.json());
	const prices = new Map<string, RawPrice>();
	for (const p of rawPrices)
		if (p.ExchangeCode === 'IC1')
			prices.set(p.MaterialTicker, p);
	return prices;
}

async function getPlanets(username: string, apiKey: string) {
	const fioBurns: FIOBurn[] = await fetch('https://rest.fnar.net/fioweb/burn/user/' + username,
		{headers: {'Authorization': apiKey}}).then(r => r.json());
	const planets = fioBurns.map(burn => new Planet(burn));
	return planets;
}

async function warehouseInventory(username: string, apiKey: string): Promise<Map<string, number>> {
	const warehouses: Warehouse[] = await fetch('https://rest.fnar.net/sites/warehouses/' + username,
		{headers: {'Authorization': apiKey}}).then(r => r.json());
	
	for (const warehouse of warehouses)
		if (warehouse.LocationNaturalId === 'HRT') {
			const storage: Storage = await fetch(`https://rest.fnar.net/storage/${username}/${warehouse.StoreId}`,
				{headers: {'Authorization': apiKey}}).then(r => r.json());
			const inventory = new Map<string, number>();
			for (const item of storage.StorageItems)
				inventory.set(item.MaterialTicker, item.MaterialAmount);
			return inventory;
		}
	throw new Error("couldn't find HRT warehouse");
}

async function getBids(username: string, apiKey: string) {
	const allOrders: ExchangeOrder[] = await fetch('https://rest.fnar.net/cxos/' + username,
		{headers: {'Authorization': apiKey}}).then(r => r.json());
	const orders = allOrders.filter(order =>
			order.OrderType === 'BUYING' && order.Status !== 'FILLED' && order.ExchangeCode === 'IC1');

	const bids = new Map<string, number>();
	for (const order of orders)
		bids.set(order.MaterialTicker, (bids.get(order.MaterialTicker) ?? 0) + order.Amount);
	return {bids, orders};
}

class Planet {
	name: string;
	inventory: Map<string, number>;
	netConsumption: Amount[];

	constructor(fioBurn: FIOBurn) {
		this.name = fioBurn.PlanetName || fioBurn.PlanetNaturalId;
		this.inventory = new Map();
		for (const item of fioBurn.Inventory)
			this.inventory.set(item.MaterialTicker, item.MaterialAmount);

		const producing = new Map<string, Amount>();
		for (const item of fioBurn.OrderProduction)
			producing.set(item.MaterialTicker, item);

		this.netConsumption = [];
		for (const c of [...fioBurn.OrderConsumption, ...fioBurn.WorkforceConsumption]) {
			let net = c.DailyAmount;
			const production = producing.get(c.MaterialTicker);
			if (production) {
				net -= production.DailyAmount;
				if (net < 0)
					continue;
			}
			c.netConsumption = net;
			this.netConsumption.push(c);
		}
	}

	supplyForDays(targetDays: number): Map<string, number> {
		const buy = new Map<string, number>();
		for (const consumption of this.netConsumption) {
			const ticker = consumption.MaterialTicker;
			const avail = this.inventory.get(ticker) ?? 0;
			const dailyConsumption = consumption.netConsumption!;
			const days = avail / dailyConsumption;
			if (days < targetDays)
				buy.set(ticker, Math.ceil((targetDays - days) * dailyConsumption));
		}
		return buy;
	}
}

interface Material {
	ticker: string;
	amount: number;
	bids: number;
	warehouse: number;
	spread: number;
	savings: number;
}

interface RawPrice {
	MaterialTicker: string;
	ExchangeCode: string;
	Bid: number | null;
	Ask: number | null;
	FullTicker: string;
}

interface ExchangeOrder {
	MaterialTicker: string;
	ExchangeCode: string;
	OrderType: 'SELLING' | 'BUYING';
	Status: 'FILLED' | 'PARTIALLY_FILLED';
	Amount: number;
	Limit: number;
}

interface StorageItem {
	MaterialTicker: string;
	MaterialAmount: number;
}

interface Storage {
	Name: string;
	StorageItems: StorageItem[];
	WeightLoad: number;
	VolumeLoad: number;
	Type: 'STORE' | 'WAREHOUSE_STORE' | 'FTL_FUEL_STORE' | 'STL_FUEL_STORE' | 'SHIP_STORE';
}

interface Warehouse {
	StoreId: string;
	LocationNaturalId: string;
}

interface Amount {
	MaterialTicker: string;
	DailyAmount: number;
	netConsumption?: number;
}

interface FIOBurn {
	PlanetName: string;
	PlanetNaturalId: string;
	Error: any;
	OrderConsumption: Amount[];
	WorkforceConsumption: Amount[];
	Inventory: StorageItem[];
	OrderProduction: Amount[];
}