// src/services/query-cache.js

const queries = new Map();

export const queryCache = {
  /**
   * Get cached query result
   * @param {string} queryId - Query identifier (e.g., "timeline", "profile:handle")
   * @returns {{ uris: string[], cursor: string|null, hasMore: boolean }|undefined}
   */
  get(queryId) {
    return queries.get(queryId);
  },

  /**
   * Set query result (replaces existing)
   * @param {string} queryId - Query identifier
   * @param {{ uris: string[], cursor: string|null, hasMore: boolean }} result
   */
  set(queryId, result) {
    queries.set(queryId, {
      uris: result.uris || [],
      cursor: result.cursor || null,
      hasMore: result.hasMore ?? true,
      fetchedAt: Date.now()
    });
  },

  /**
   * Append to existing query result (for pagination)
   * @param {string} queryId - Query identifier
   * @param {{ uris: string[], cursor: string|null, hasMore: boolean }} result
   */
  append(queryId, result) {
    const existing = queries.get(queryId);
    if (existing) {
      queries.set(queryId, {
        uris: [...existing.uris, ...(result.uris || [])],
        cursor: result.cursor || null,
        hasMore: result.hasMore ?? true,
        fetchedAt: existing.fetchedAt // preserve original fetch time
      });
    } else {
      this.set(queryId, result);
    }
  },

  /**
   * Check if query is cached
   * @param {string} queryId - Query identifier
   * @returns {boolean}
   */
  has(queryId) {
    return queries.has(queryId);
  },

  /**
   * Clear all query cache (useful for logout or refresh)
   */
  clear() {
    queries.clear();
  }
};