pruncalc/src/main.ts

interface Recipe {
	RecipeId: string;
	BuildingTicker: string;
	RecipeName: string;
	TimeMs: number;
	Inputs: Array<{Ticker: string; Amount: number}>;
	Outputs: Array<{Ticker: string; Amount: number}>;
}

interface Price {
	MaterialTicker: string;
	ExchangeCode: string;
	PriceAverage: number;
}

async function fetchData(): Promise<{recipes: Recipe[]; prices: Price[]}> {
	const [recipesResponse, exchangesResponse] = await Promise.all([
		fetch('https://api.prunplanner.org/data/recipes'),
		fetch('https://api.prunplanner.org/data/exchanges'),
	]);
	const [recipes, prices] = await Promise.all([
		recipesResponse.json(),
		exchangesResponse.json(),
	]);
	return {recipes, prices};
}

function render({recipes, prices}: {recipes: Recipe[], prices: Price[]}) {
	const priceMap = new Map<string, number>();
	for (const price of prices)
		if (price.ExchangeCode == 'PP7D_IC1')
			priceMap.set(price.MaterialTicker, price.PriceAverage);

	const fmt = new Intl.NumberFormat(undefined, {maximumFractionDigits: 2});

	const tbody = document.querySelector('tbody') as HTMLTableSectionElement;
	tbody.innerHTML = '';
	for (const recipe of recipes) {
		if (recipe.BuildingTicker !== 'FRM')
			continue;
		const runsPerDay = 1000 * 60 * 60 * 24 / recipe.TimeMs;

		const revenuePerRun = recipe.Outputs.reduce((sum, output) => {
			const price = priceMap.get(output.Ticker);
			if (price === undefined)
				throw new Error(`missing price for ${output.Ticker}`);
			return sum + price * output.Amount;
		}, 0);

		const costPerRun = recipe.Inputs.reduce((sum, input) => {
			const price = priceMap.get(input.Ticker);
			if (price === undefined)
				throw new Error(`missing price for ${input.Ticker}`);
			return sum + price * input.Amount;
		}, 0);

		const row = document.createElement('tr');
		row.innerHTML = `
			<td>${recipe.RecipeName}</td>
			<td>${fmt.format(revenuePerRun * runsPerDay)}</td>
			<td>${fmt.format(costPerRun * runsPerDay)}</td>
			<td>${fmt.format((revenuePerRun - costPerRun) * runsPerDay)}</td>
		`;
		tbody.appendChild(row);
	}
}

fetchData().then(render);