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

const baseUrl = process.env.VITE_API_BASE_URL ?? "http://localhost:3000";
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 nextSnapshot = join(directory, "openapi.json");
const nextGenerated = join(directory, "schema.d.ts");

try {
	const response = await fetch(`${baseUrl}/api/docs-json`, {
		headers: { Accept: "application/json" },
	});
	if (!response.ok)
		throw new Error(
			`OpenAPI sync failed: ${response.status} ${response.statusText}`,
		);
	const document = await response.json();
	if (!document || typeof document !== "object")
		throw new Error("OpenAPI sync failed: endpoint did not return an object");
	await writeFile(nextSnapshot, `${JSON.stringify(document, null, 2)}\n`);
	await new Promise((resolve, reject) => {
		const child = spawn(
			"npx",
			["--no-install", "openapi-typescript", nextSnapshot, "-o", nextGenerated],
			{
				stdio: "inherit",
			},
		);
		child.on("error", reject);
		child.on("exit", (code) =>
			code === 0
				? resolve()
				: reject(new Error(`openapi-typescript exited with ${code}`)),
		);
	});
	await rename(nextSnapshot, snapshot);
	await rename(nextGenerated, generated);
} finally {
	await rm(directory, { recursive: true, force: true });
}