rag-v2-improved

export interface MemoryEntry {
  topic: string;
  summary: string;
  timestamp: number;
}

export class MemoryService {
  private static memory = new Map<string, MemoryEntry[]>();

  public static save(topic: string, summary: string): void {
    const entry: MemoryEntry = {
      topic,
      summary,
      timestamp: Date.now(),
    };

    const existing = this.memory.get(topic) || [];
    existing.push(entry);
    this.memory.set(topic, existing);
  }

  public static retrieve(topic: string): string {
    const entries = this.memory.get(topic);

    if (!entries || entries.length === 0) {
      return "";
    }

    return entries
      .slice(-3)
      .map(entry => `- ${entry.summary}`)
      .join("\n");
  }
}