// Writes src/shared/version.gen.ts (gitignored) with the "Build n" version:
// n = commit count since the repo root, Sublime Text style. Regenerated by
// postinstall and by every dev/build/release script — never committed, since
// committing it would bump the very count it records.
import path from "node:path";

function git(args: string[]): string | null {
	try {
		const proc = Bun.spawnSync(["git", ...args], {
			cwd: import.meta.dir,
			stdout: "pipe",
			stderr: "ignore",
		});
		if (!proc.success) return null;
		return proc.stdout.toString().trim() || null;
	} catch {
		return null;
	}
}

const number = Number(git(["rev-list", "--count", "HEAD"]) ?? 0);
const commit = git(["rev-parse", "--short", "HEAD"]) ?? "dev";
const date = new Date().toISOString().slice(0, 10);

let electrobun = "unknown";
try {
	const pkg = await Bun.file(
		path.join(import.meta.dir, "..", "node_modules", "electrobun", "package.json"),
	).json();
	electrobun = pkg.version;
} catch {
	// not installed yet (postinstall ordering) — fine
}

const out = `// GENERATED by scripts/gen-version.ts — do not edit, do not commit.
export const BUILD = {
	number: ${number},
	commit: ${JSON.stringify(commit)},
	date: ${JSON.stringify(date)},
	electrobun: ${JSON.stringify(electrobun)},
} as const;
`;

const target = path.join(import.meta.dir, "..", "src", "shared", "version.gen.ts");
await Bun.write(target, out);
console.log(`[version] Build ${number} (${commit}) -> ${path.relative(process.cwd(), target)}`);