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

dotenv.config();

const ConfigSchema = z.object({
  mcp: z.object({
    host: z.string().default('127.0.0.1'),
    port: z.number().default(19017),
    logLevel: z.enum(['debug', 'info', 'warn', 'error', 'silent']).default('info'),
  }),
  nats: z.object({
    url: z.string().default('nats://localhost:4222'),
    reconnectTimeWait: z.number().default(2000),
    maxReconnectAttempts: z.number().default(10),
  }),
  security: z.object({
    jwtSecret: z.string().min(32),
    authEnabled: z.boolean().default(true),
  }),
  modules: z.object({
    startupTimeout: z.number().default(5000),
    healthCheckInterval: z.number().default(30000),
  }),
});

type Config = z.infer<typeof ConfigSchema>;

function loadConfig(): Config {
  const config = {
    mcp: {
      host: process.env.MCP_HOST || '127.0.0.1',
      port: parseInt(process.env.MCP_PORT || '19017', 10),
      logLevel: process.env.MCP_LOG_LEVEL || 'info',
    },
    nats: {
      url: process.env.NATS_URL || 'nats://localhost:4222',
      reconnectTimeWait: parseInt(process.env.NATS_RECONNECT_TIME_WAIT || '2000', 10),
      maxReconnectAttempts: parseInt(process.env.NATS_MAX_RECONNECT_ATTEMPTS || '10', 10),
    },
    security: {
      jwtSecret: process.env.JWT_SECRET || 'development-secret-change-in-production-minimum-32-chars',
      authEnabled: process.env.AUTH_ENABLED !== 'false',
    },
    modules: {
      startupTimeout: parseInt(process.env.MODULE_STARTUP_TIMEOUT || '5000', 10),
      healthCheckInterval: parseInt(process.env.MODULE_HEALTH_CHECK_INTERVAL || '30000', 10),
    },
  };

  return ConfigSchema.parse(config);
}

export const config = loadConfig();