import { Router, Request, Response } from 'express';
import { readFileSync } from 'fs';
import { join } from 'path';

const router = Router();

// Read package.json version at startup
let packageVersion = 'unknown';
try {
  const packageJson = JSON.parse(readFileSync(join(__dirname, '../../package.json'), 'utf-8'));
  packageVersion = packageJson.version || 'unknown';
} catch {
  // Fallback if package.json not found
}

/**
 * GET /api/version
 * Returns build version information for display in admin UI
 */
router.get('/', async (req: Request, res: Response) => {
  try {
    const gitSha = process.env.APP_GIT_SHA || 'unknown';
    const versionInfo = {
      version: packageVersion,
      build_version: process.env.APP_BUILD_VERSION?.slice(0, 8) || 'dev',
      git_sha: gitSha.slice(0, 8) || 'unknown',
      git_sha_full: gitSha,
      build_time: process.env.APP_BUILD_TIME || 'unknown',
      image_tag: process.env.CONTAINER_IMAGE_TAG?.slice(0, 8) || 'local',
    };

    res.json(versionInfo);
  } catch (error: any) {
    console.error('Error fetching version info:', error);
    res.status(500).json({ error: 'Failed to fetch version info' });
  }
});

export default router;