import chalk from 'chalk';
import packageJson from '../../package.json';
import { CLIError, ExitCodes } from '../errors/platform-error';

const oldestSupportNodeMajorVersion = 20;

// True only when `current` is strictly behind `latest` (semver numeric compare).
// A local/unreleased build that is ahead of (or equal to) the published latest is
// NOT out of date — strict `!==` wrongly blocked devs running a newer local link.
// Unparseable versions can't be compared, so we never block on them.
export const isWorkbenchOutdated = (current: string, latest: string): boolean => {
  const c = current.split('.').map((n) => Number.parseInt(n, 10));
  const l = latest.split('.').map((n) => Number.parseInt(n, 10));
  if ([...c, ...l].some(Number.isNaN)) return false;
  for (let i = 0; i < Math.max(c.length, l.length); i += 1) {
    const a = c[i] ?? 0;
    const b = l[i] ?? 0;
    if (a !== b) return a < b;
  }
  return false;
};

export const checkPackageAndNodeVersion = async (shouldLog = true) => {
  try {
    // Check Node.js version
    const nodeMajorVersion = Number.parseInt(process.version.replace('v', '').split('.')[0], 10);
    const nodeOutdated = nodeMajorVersion < oldestSupportNodeMajorVersion;
    if (nodeOutdated && shouldLog) {
      throw new CLIError(
        `Your Node.js version is no longer supporter by Root Workbench.\n\n` +
          `Current version: ${process.version}\n` +
          `Oldest supported version: v${oldestSupportNodeMajorVersion}\n` +
          `Please install version ${oldestSupportNodeMajorVersion} or later. See https://nodejs.org/ for more.\n\n` +
          `Contact support@root.co.za for assistance.`,
        ExitCodes.VERSION_MISMATCH,
      );
    }

    // Fetch latest from NPM registry
    const response = await fetch('https://registry.npmjs.org/@rootplatform/cli');
    const data = (await response.json()) as Record<string, any>;
    const latestVersion = data['dist-tags'].latest as string;

    // Read local version
    const currentVersion = packageJson.version;
    const workbenchOutdated = isWorkbenchOutdated(currentVersion, latestVersion);
    if (workbenchOutdated && shouldLog) {
      throw new CLIError(
        `Your Root Workbench version is out of date.\n\n` +
          `Current version: ${currentVersion}\n` +
          `Latest version: ${latestVersion}\n\n` +
          `Please install the latest version using ${chalk.bold('npm i -g @rootplatform/cli')}\n\n` +
          `Contact support@root.co.za for assistance.`,
        ExitCodes.VERSION_MISMATCH,
      );
    }

    return {
      latest: latestVersion,
      current: currentVersion,
    };
  } catch (error) {
    console.log(
      chalk.red(
        'Version check failed. Please update your npm package to the latest version or contact support@root.co.za.',
      ),
    );

    throw error;
  }
};