import path from "node:path";
import { createPiSession } from "../../../test/fixture/create-pi-session.ts";
import { findNu } from "../runtime.ts";

const rounds = Number(process.env["NUSHELL_BENCH_ROUNDS"] ?? 25);
const warmups = Number(process.env["NUSHELL_BENCH_WARMUPS"] ?? 3);
if (
	!Number.isSafeInteger(rounds) ||
	rounds < 1 ||
	!Number.isSafeInteger(warmups) ||
	warmups < 0
)
	throw new Error(
		"Benchmark rounds must be positive integers; warmups may be zero",
	);
if (!findNu()) throw new Error("nu executable missing on PATH");

const session = await createPiSession({
	cwd: process.cwd(),
	extensionPaths: [path.resolve(import.meta.dirname, "../index.ts")],
});
try {
	const runner = session.session.extensionRunner;
	const fresh = session.extensions[0]?.tools.get("nu")?.definition;
	if (!fresh) throw new Error("Nushell fresh tool not registered");
	const exec = async () => {
		const result = await fresh.execute(
			"bench",
			{ command: "1 + 2" },
			undefined,
			undefined,
			runner.createToolContext("bench", undefined),
		);
		if (
			!result.content.some(
				(part: { type: string; text?: string }) =>
					part.type === "text" && (part.text?.includes("3") ?? false),
			)
		)
			throw new Error("Incorrect benchmark output");
	};
	const measure = async (record: boolean) => {
		const start = process.hrtime.bigint();
		await exec();
		if (record)
			console.log(
				`BenchmarkNuFresh\t1\t${process.hrtime.bigint() - start} ns/op`,
			);
	};
	console.log(`goos: ${process.platform}`);
	console.log(`goarch: ${process.arch}`);
	console.log("pkg: pi-ext/nushell");
	console.log(`node: ${process.version}`);
	for (let index = -warmups; index < rounds; index++) await measure(index >= 0);
} finally {
	await session.dispose();
}