/**
 * Monitoring configuration using envalid
 * Prometheus metrics, Grafana visualization, and Loki logging
 */
import { cleanEnv, str, port, bool, num } from 'envalid';

/**
 * Prometheus configuration with validation and defaults
 */
export const prometheusConfig = cleanEnv(process.env, {
  // Prometheus Server
  PROMETHEUS_HOST: str({ default: 'localhost', desc: 'Prometheus host' }),
  PROMETHEUS_PORT: port({ default: 9090, desc: 'Prometheus port' }),
  PROMETHEUS_URL: str({ default: '', desc: 'Complete Prometheus URL (overrides host/port)' }),
  
  // Authentication
  PROMETHEUS_USERNAME: str({ default: '', desc: 'Prometheus username (if auth enabled)' }),
  PROMETHEUS_PASSWORD: str({ default: '', desc: 'Prometheus password (if auth enabled)' }),
  
  // Metrics Collection
  PROMETHEUS_SCRAPE_INTERVAL: str({ default: '15s', desc: 'Default scrape interval' }),
  PROMETHEUS_EVALUATION_INTERVAL: str({ default: '15s', desc: 'Rule evaluation interval' }),
  PROMETHEUS_RETENTION_TIME: str({ default: '15d', desc: 'Data retention time' }),
  
  // TLS Settings
  PROMETHEUS_TLS_ENABLED: bool({ default: false, desc: 'Enable TLS for Prometheus' }),
  PROMETHEUS_TLS_INSECURE: bool({ default: false, desc: 'Skip TLS verification' }),
});

/**
 * Grafana configuration with validation and defaults
 */
export const grafanaConfig = cleanEnv(process.env, {
  // Grafana Server
  GRAFANA_HOST: str({ default: 'localhost', desc: 'Grafana host' }),
  GRAFANA_PORT: port({ default: 3000, desc: 'Grafana port' }),
  GRAFANA_URL: str({ default: '', desc: 'Complete Grafana URL (overrides host/port)' }),
  
  // Authentication
  GRAFANA_ADMIN_USER: str({ default: 'admin', desc: 'Grafana admin username' }),
  GRAFANA_ADMIN_PASSWORD: str({ default: 'admin', desc: 'Grafana admin password' }),
  
  // Security Settings
  GRAFANA_ALLOW_SIGN_UP: bool({ default: false, desc: 'Allow user sign up' }),
  GRAFANA_SECRET_KEY: str({ default: '', desc: 'Grafana secret key for encryption' }),
  
  // Database Settings
  GRAFANA_DATABASE_TYPE: str({ 
    default: 'sqlite3', 
    choices: ['mysql', 'postgres', 'sqlite3'],
    desc: 'Grafana database type' 
  }),
  GRAFANA_DATABASE_URL: str({ default: '', desc: 'Grafana database URL' }),
  
  // Feature Flags
  GRAFANA_DISABLE_GRAVATAR: bool({ default: true, desc: 'Disable Gravatar avatars' }),
  GRAFANA_ENABLE_GZIP: bool({ default: true, desc: 'Enable gzip compression' }),
});

// Export typed configuration objects
export type PrometheusConfig = typeof prometheusConfig;
export type GrafanaConfig = typeof grafanaConfig;

// Export individual config values for convenience
export const {
  PROMETHEUS_HOST,
  PROMETHEUS_PORT,
  PROMETHEUS_URL,
  PROMETHEUS_USERNAME,
  PROMETHEUS_PASSWORD,
  PROMETHEUS_SCRAPE_INTERVAL,
  PROMETHEUS_EVALUATION_INTERVAL,
  PROMETHEUS_RETENTION_TIME,
  PROMETHEUS_TLS_ENABLED,
  PROMETHEUS_TLS_INSECURE,
} = prometheusConfig;

export const {
  GRAFANA_HOST,
  GRAFANA_PORT,
  GRAFANA_URL,
  GRAFANA_ADMIN_USER,
  GRAFANA_ADMIN_PASSWORD,
  GRAFANA_ALLOW_SIGN_UP,
  GRAFANA_SECRET_KEY,
  GRAFANA_DATABASE_TYPE,
  GRAFANA_DATABASE_URL,
  GRAFANA_DISABLE_GRAVATAR,
  GRAFANA_ENABLE_GZIP,
} = grafanaConfig;