import type { SearchResult } from "./providers/types.js";

export function deduplicateResults(results: SearchResult[]): SearchResult[] {
  const seen = new Set<string>();
  return results.filter((r) => {
    const key = r.url || r.title;
    if (seen.has(key)) return false;
    seen.add(key);
    return true;
  });
}

export class SafeMemoryCache<T> {
  private cache = new Map<string, { value: T; expiry: number }>();
  constructor(private ttlMs: number, private maxSize: number) {}

  get(key: string): T | undefined {
    const entry = this.cache.get(key);
    if (!entry) return undefined;
    if (Date.now() > entry.expiry) {
      this.cache.delete(key);
      return undefined;
    }
    return entry.value;
  }

  set(key: string, value: T): void {
    if (this.cache.size >= this.maxSize) {
      const firstKey = this.cache.keys().next().value;
      if (firstKey) this.cache.delete(firstKey);
    }
    this.cache.set(key, { value, expiry: Date.now() + this.ttlMs });
  }
}