import axios from 'axios';
import type { GraphData, Node, Edge } from '../types/graph';
import { API_BASE_URL, API_TIMEOUT } from '../config/constants';

/**
 * API 客户端实例
 * 统一配置了 base URL、超时时间和默认请求头
 */
const apiClient = axios.create({
  baseURL: API_BASE_URL,
  timeout: API_TIMEOUT,
  headers: {
    'Content-Type': 'application/json',
  },
});

/**
 * 知识图谱 API 服务
 * 提供与后端交互的所有图谱相关接口
 */
export const graphApi = {
  /**
   * 获取完整的知识图谱数据
   * @returns 节点和边的集合
   */
  async getData(): Promise<GraphData> {
    try {
      const response = await apiClient.get<GraphData>('/graph');
      return response.data;
    } catch (error) {
      console.error('Failed to fetch graph data:', error);
      return { nodes: [], edges: [] };
    }
  },

  /**
   * 搜索节点（后端搜索）
   * @param query 搜索关键词
   * @returns 匹配的节点列表
   */
  async searchNodes(query: string): Promise<Node[]> {
    try {
      const response = await apiClient.get<Node[]>(`/search?q=${encodeURIComponent(query)}`);
      return response.data;
    } catch (error) {
      console.error('Failed to search nodes:', error);
      return [];
    }
  },

  /**
   * 根据 ID 获取节点详情
   * @param id 节点 ID
   * @returns 节点对象或 null
   */
  async getNodeById(id: string): Promise<Node | null> {
    try {
      const response = await apiClient.get<Node>(`/nodes/${id}`);
      return response.data;
    } catch (error) {
      console.error('Failed to fetch node:', error);
      return null;
    }
  },

  /**
   * 获取节点的邻居节点和连接边
   * @param nodeId 节点 ID
   * @returns 包含邻居节点和边的对象
   */
  async getNeighbors(nodeId: string): Promise<{ nodes: Node[]; edges: Edge[] }> {
    try {
      const response = await apiClient.get(`/nodes/${nodeId}/neighbors`);
      return response.data;
    } catch (error) {
      console.error('Failed to fetch neighbors:', error);
      return { nodes: [], edges: [] };
    }
  },
};

export default apiClient;