import { spawn } from "node:child_process";
import { mkdtemp, readFile, rm } from "node:fs/promises";
import { tmpdir } from "node:os";
import { join } from "node:path";

const snapshot = "src/shared/api/spec/openapi.json";
const generated = "src/shared/api/generated/schema.d.ts";
const directory = await mkdtemp(join(tmpdir(), "wealth-ledger-openapi-"));
const expected = join(directory, "schema.d.ts");

try {
	await new Promise((resolve, reject) => {
		const child = spawn(
			"npx",
			["--no-install", "openapi-typescript", snapshot, "-o", expected],
			{
				stdio: "inherit",
			},
		);
		child.on("error", reject);
		child.on("exit", (code) =>
			code === 0
				? resolve()
				: reject(new Error(`openapi-typescript exited with ${code}`)),
		);
	});
	if (
		(await readFile(expected, "utf8")) !== (await readFile(generated, "utf8"))
	) {
		throw new Error(
			"Generated OpenAPI types drift from src/shared/api/spec/openapi.json. Run npm run openapi:generate.",
		);
	}
} finally {
	await rm(directory, { recursive: true, force: true });
}