import { execSync } from "node:child_process";
import {
	compareSemver,
	fetchLatestVersionFromRegistry,
	resolveInstallCommand,
} from "./update-check.js";

const NPM_PACKAGE = "singularity-forge";

export async function runUpdate(): Promise<void> {
	const current = process.env.SF_VERSION || "0.0.0";
	const bold = "\x1b[1m";
	const dim = "\x1b[2m";
	const green = "\x1b[32m";
	const yellow = "\x1b[33m";
	const reset = "\x1b[0m";

	process.stdout.write(`${dim}Current version:${reset} v${current}\n`);
	process.stdout.write(`${dim}Checking npm registry...${reset}\n`);

	const latest = await fetchLatestVersionFromRegistry();
	if (!latest) {
		process.stderr.write(`${yellow}Failed to reach npm registry.${reset}\n`);
		process.exit(1);
	}

	process.stdout.write(`${dim}Latest version:${reset}  v${latest}\n`);

	if (compareSemver(latest, current) <= 0) {
		process.stdout.write(`${green}Already up to date.${reset}\n`);
		return;
	}

	process.stdout.write(
		`${dim}Updating:${reset} v${current} → ${bold}v${latest}${reset}\n`,
	);

	const installCmd = resolveInstallCommand(`${NPM_PACKAGE}@latest`);
	try {
		execSync(installCmd, {
			stdio: "inherit",
		});
		process.stdout.write(`\n${green}${bold}Updated to v${latest}${reset}\n`);
	} catch {
		process.stderr.write(
			`\n${yellow}Update failed. Try manually: ${installCmd}${reset}\n`,
		);
		process.exit(1);
	}
}