/**
 * Redis-based RDAP caching layer
 * Caches RDAP lookups with 1-hour TTL to reduce external RIR queries
 * Target: 60% hit rate on repeated lookups within same session
 */

interface RedisClient {
  get(key: string): Promise<string | null>;
  set(key: string, value: string, ex?: number): Promise<void>;
  del(key: string): Promise<number>;
}

let redisClient: RedisClient | null = null;

export function initRedisCache(client: RedisClient): void {
  redisClient = client;
  console.log('[RDAP Cache] Redis client initialized');
}

const RDAP_CACHE_TTL = 3600; // 1 hour

export async function getRdapCached(resource: string): Promise<any | null> {
  if (!redisClient) return null;

  const cacheKey = `rdap:${resource}`;
  try {
    const cached = await redisClient.get(cacheKey);
    if (cached) {
      console.log(`[RDAP Cache] HIT: ${resource}`);
      return JSON.parse(cached);
    }
  } catch (error) {
    console.error('[RDAP Cache] Error reading cache:', error);
  }

  return null;
}

export async function setRdapCached(resource: string, data: any): Promise<void> {
  if (!redisClient) return;

  const cacheKey = `rdap:${resource}`;
  try {
    await redisClient.set(cacheKey, JSON.stringify(data), RDAP_CACHE_TTL);
    console.log(`[RDAP Cache] SET: ${resource} (TTL: ${RDAP_CACHE_TTL}s)`);
  } catch (error) {
    console.error('[RDAP Cache] Error writing cache:', error);
  }
}

export async function clearRdapCache(resource: string): Promise<void> {
  if (!redisClient) return;

  const cacheKey = `rdap:${resource}`;
  try {
    await redisClient.del(cacheKey);
    console.log(`[RDAP Cache] DELETED: ${resource}`);
  } catch (error) {
    console.error('[RDAP Cache] Error deleting cache:', error);
  }
}

export function getCacheStats() {
  if (!redisClient) {
    return { status: 'disabled', message: 'Redis client not initialized' };
  }
  return { status: 'enabled', ttl_seconds: RDAP_CACHE_TTL };
}