/**
 * API client for domain consensus plugin
 */

class APIClient {
  constructor() {
    this.baseUrl = window.location.origin;
    this.cache = new Map();
    this.cacheTimeout = 30000; // 30 seconds
  }

  /**
   * Make an API request
   */
  async request(endpoint, options = {}) {
    const url = `${this.baseUrl}/${endpoint}`;
    
    try {
      const response = await fetch(url, {
        ...options,
        headers: {
          'Content-Type': 'application/json',
          ...options.headers
        }
      });

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }

      const data = await response.json();
      return data;
    } catch (error) {
      console.error(`API request failed: ${endpoint}`, error);
      throw error;
    }
  }

  /**
   * Get overview data
   */
  async getOverview() {
    const cacheKey = 'overview';
    const cached = this.cache.get(cacheKey);
    
    if (cached && (Date.now() - cached.timestamp) < this.cacheTimeout) {
      return cached.data;
    }

    try {
      const data = await this.request('api/overview');
      this.cache.set(cacheKey, { data, timestamp: Date.now() });
      return data;
    } catch (error) {
      // Return cached data if available, even if expired
      if (cached) {
        return cached.data;
      }
      throw error;
    }
  }

  /**
   * Get all domains with consensus status
   */
  async getDomains() {
    const cacheKey = 'domains';
    const cached = this.cache.get(cacheKey);
    
    if (cached && (Date.now() - cached.timestamp) < this.cacheTimeout) {
      return cached.data;
    }

    try {
      const data = await this.request('api/domains');
      this.cache.set(cacheKey, { data, timestamp: Date.now() });
      return data;
    } catch (error) {
      if (cached) {
        return cached.data;
      }
      throw error;
    }
  }

  /**
   * Get detailed consensus state for a specific domain
   */
  async getDomainDetail(domain) {
    const cacheKey = `domain:${domain}`;
    const cached = this.cache.get(cacheKey);
    
    if (cached && (Date.now() - cached.timestamp) < this.cacheTimeout) {
      return cached.data;
    }

    try {
      const encodedDomain = encodeURIComponent(domain);
      const data = await this.request(`api/domain/${encodedDomain}`);
      this.cache.set(cacheKey, { data, timestamp: Date.now() });
      return data;
    } catch (error) {
      if (cached) {
        return cached.data;
      }
      throw error;
    }
  }

  /**
   * Get consensus metrics
   */
  async getMetrics() {
    const cacheKey = 'metrics';
    const cached = this.cache.get(cacheKey);
    
    if (cached && (Date.now() - cached.timestamp) < this.cacheTimeout) {
      return cached.data;
    }

    try {
      const data = await this.request('api/metrics');
      this.cache.set(cacheKey, { data, timestamp: Date.now() });
      return data;
    } catch (error) {
      if (cached) {
        return cached.data;
      }
      throw error;
    }
  }

  /**
   * Get peer information
   */
  async getPeers() {
    const cacheKey = 'peers';
    const cached = this.cache.get(cacheKey);
    
    if (cached && (Date.now() - cached.timestamp) < this.cacheTimeout) {
      return cached.data;
    }

    try {
      const data = await this.request('api/peers');
      this.cache.set(cacheKey, { data, timestamp: Date.now() });
      return data;
    } catch (error) {
      if (cached) {
        return cached.data;
      }
      throw error;
    }
  }

  /**
   * Invalidate cache for a specific key or all cache
   */
  invalidateCache(key = null) {
    if (key) {
      this.cache.delete(key);
    } else {
      this.cache.clear();
    }
  }
}

// Create singleton instance
window.apiClient = new APIClient();