import { execSync, spawn } from 'node:child_process';
import { mkdtempSync, mkdirSync } from 'node:fs';
import { tmpdir } from 'node:os';
import { join } from 'node:path';

const FA2JSON = new URL('../../build/fa2json', import.meta.url).pathname;

export async function setup() {
	// Create image file and format
	const img = execSync('mktemp /tmp/fa2json-test-XXXXXX.img').toString().trim();
	execSync(`truncate -s 10M ${img}`);
	execSync(`mkfs.ext4 -q ${img}`);

	// Create mount point and mount
	const mnt = execSync('mktemp -d /tmp/fa2json-mnt-XXXXXX').toString().trim();
	execSync(`sudo mount ${img} ${mnt}`);

	// Hand ownership to current user, then sync before fa2json starts
	execSync(`sudo chown ${process.getuid()} ${mnt}`);
	execSync('sync');

	async function teardown() {
		try { execSync(`sudo umount ${mnt}`); } catch {}
		try { execSync(`rm -f ${img}`); } catch {}
		try { execSync(`rmdir ${mnt}`); } catch {}
	}

	return { img, mnt, teardown };
}

export function spawnFa2json(mnt) {
	const proc = spawn('sudo', [FA2JSON, mnt], { stdio: ['ignore', 'pipe', 'inherit'] });
	return proc;
}