import { z } from 'zod';
import dotenv from 'dotenv';

dotenv.config();

const envSchema = z.object({
  NODE_ENV: z.enum(['development', 'production', 'test']).default('development'),
  PORT: z.coerce.number().default(3000),
  APP_URL: z.string().url().default('http://localhost:3000'),

  SESSION_SECRET: z.string().min(32),
  SESSION_TTL_DAYS: z.coerce.number().default(30),
  CSRF_SECRET: z.string().min(32),

  ARGON2_MEMORY: z.coerce.number().default(65536),
  ARGON2_ITERATIONS: z.coerce.number().default(3),
  ARGON2_PARALLELISM: z.coerce.number().default(4),

  GROQ_API_KEY: z.string().min(1),
  GROQ_MODELS: z.string().default('llama-3.1-70b-versatile,llama-3.1-8b-instant,gemma2-9b-it'),

  SCRAPER_RATE_LIMIT: z.coerce.number().default(10),
  SCRAPER_INTERVAL_MS: z.coerce.number().default(6000),
  WHATSAPP_CHANNEL_REGEX: z.string().default('^https://chat\\.whatsapp\\.com/[A-Za-z0-9]{22}$'),

  IPAPI_KEY: z.string().optional(),
  VPN_DETECTION_ENABLED: z.coerce.boolean().default(true),

  CAPTCHA_PROVIDER: z.enum(['hcaptcha', 'turnstile']).default('hcaptcha'),
  CAPTCHA_SECRET_KEY: z.string().optional(),
  CAPTCHA_SITE_KEY: z.string().optional(),

  ADMIN_INIT_USERNAME: z.string().default('admin'),
  ADMIN_INIT_PASSWORD: z.string().default('changeme'),

  LOG_LEVEL: z.enum(['trace', 'debug', 'info', 'warn', 'error']).default('info'),
  LOG_DIR: z.string().default('./data/logs'),
  DATA_DIR: z.string().default('./data'),
});

export type Env = z.infer<typeof envSchema>;

let env: Env;

try {
  env = envSchema.parse(process.env);
} catch (error) {
  if (error instanceof z.ZodError) {
    console.error('❌ Invalid environment variables:');
    error.errors.forEach(e => console.error(`  ${e.path.join('.')}: ${e.message}`));
    process.exit(1);
  }
  throw error;
}

export const config = {
  ...env,
  groqModels: env.GROQ_MODELS.split(',').map(m => m.trim()),
  whatsappChannelRegex: new RegExp(env.WHATSAPP_CHANNEL_REGEX),
  sessionTtlMs: env.SESSION_TTL_DAYS * 24 * 60 * 60 * 1000,
};