src/lib/server-utils.ts

import { randomUUID } from 'crypto';
import { APP_CONFIG } from '../config/constants';

/**
 * Generates a unique ID with a prefix
 * Uses crypto.randomUUID() for guaranteed uniqueness
 * Server-side only (Node.js crypto module)
 */
export function generateId(prefix: keyof typeof APP_CONFIG.idPrefixes): string {
  const prefixStr = APP_CONFIG.idPrefixes[prefix];
  const uuid = randomUUID();
  return `${prefixStr}-${uuid.slice(0, 8)}`;
}

/**
 * Validates environment variables at startup
 * Server-side only (process.env)
 */
export function validateEnv(): { missing: string[]; warnings: string[] } {
  const missing: string[] = [];
  const warnings: string[] = [];

  if (!process.env.OPENROUTER_API_KEY && (!process.env.GEMINI_API_KEY || process.env.GEMINI_API_KEY === 'MY_GEMINI_API_KEY')) {
    warnings.push('No AI provider configured (OPENROUTER_API_KEY or GEMINI_API_KEY) — chat will use offline fallback');
  }

  if (!process.env.BETTER_AUTH_SECRET) {
    missing.push('BETTER_AUTH_SECRET');
  }

  if (!process.env.APP_URL) {
    warnings.push('APP_URL not configured — using http://localhost:3000');
  }

  if (!process.env.GITHUB_CLIENT_ID || !process.env.GITHUB_CLIENT_SECRET) {
    warnings.push('GitHub OAuth credentials not configured — GitHub login will fail');
  }

  if (!process.env.GOOGLE_CLIENT_ID || !process.env.GOOGLE_CLIENT_SECRET) {
    warnings.push('Google OAuth credentials not configured — Google login will fail');
  }

  return { missing, warnings };
}