/**
 * API 调用封装
 * 统一处理与后端 REST 接口的交互，返回解析后的数据或抛出错误
 */
const API = {
  /**
   * 通用请求方法
   * @param {string} url - 请求路径
   * @param {Object} options - fetch 选项
   * @returns {Promise<any>} 响应数据
   */
  async request(url, options = {}) {
    const headers = { "Content-Type": "application/json" };
    // 自动携带认证 token
    const token = localStorage.getItem("registry_token");
    if (token) {
      headers["Authorization"] = `Bearer ${token}`;
    }
    const opts = { headers, ...options };
    if (opts.body && typeof opts.body !== "string") {
      opts.body = JSON.stringify(opts.body);
    }
    const res = await fetch(url, opts);
    // 401 未登录，跳转登录页
    if (res.status === 401 && !url.includes("/api/auth/")) {
      localStorage.removeItem("registry_token");
      localStorage.removeItem("registry_user");
      window.location.href = "/login.html";
      throw new Error("登录已过期，请重新登录");
    }
    const json = await res.json();
    if (!json.success) {
      throw new Error(json.message || "请求失败");
    }
    return json.data;
  },

  // ========== 认证 ==========

  login(username, password) {
    return this.request("/api/auth/login", { method: "POST", body: { username, password } });
  },

  logout() {
    return this.request("/api/auth/logout", { method: "POST" });
  },

  getMe() {
    return this.request("/api/auth/me");
  },

  // ========== 项目 ==========

  getProjects() {
    return this.request("/api/projects");
  },

  getProject(id) {
    return this.request(`/api/projects/${id}`);
  },

  createProject(data) {
    return this.request("/api/projects", { method: "POST", body: data });
  },

  deleteProject(id) {
    return this.request(`/api/projects/${id}`, { method: "DELETE" });
  },

  updateMappings(id, mappings) {
    return this.request(`/api/projects/${id}/mappings`, { method: "PUT", body: mappings });
  },

  // ========== 配置 ==========

  getConfigs(projectId) {
    return this.request(`/api/projects/${projectId}/configs`);
  },

  createConfig(projectId, data) {
    return this.request(`/api/projects/${projectId}/configs`, { method: "POST", body: data });
  },

  updateConfig(projectId, configId, data) {
    return this.request(`/api/projects/${projectId}/configs/${configId}`, { method: "PUT", body: data });
  },

  deleteConfig(projectId, configId) {
    return this.request(`/api/projects/${projectId}/configs/${configId}`, { method: "DELETE" });
  },

  // ========== 模式 ==========

  getMode() {
    return this.request("/api/mode");
  },

  setMode(mode) {
    return this.request("/api/mode", { method: "PUT", body: { mode } });
  },

  // ========== 用户管理 ==========

  getUsers() {
    return this.request("/api/users");
  },

  createUser(data) {
    return this.request("/api/users", { method: "POST", body: data });
  },

  updateUser(id, data) {
    return this.request(`/api/users/${id}`, { method: "PUT", body: data });
  },

  resetPassword(id, password) {
    return this.request(`/api/users/${id}/password`, { method: "PUT", body: { password } });
  },

  deleteUser(id) {
    return this.request(`/api/users/${id}`, { method: "DELETE" });
  },

  // ========== Token 管理 ==========

  getTokens() {
    return this.request("/api/tokens");
  },

  createToken(data) {
    return this.request("/api/tokens", { method: "POST", body: data });
  },

  updateToken(id, data) {
    return this.request(`/api/tokens/${id}`, { method: "PUT", body: data });
  },

  revokeToken(id) {
    return this.request(`/api/tokens/${id}/revoke`, { method: "PUT" });
  },

  deleteToken(id) {
    return this.request(`/api/tokens/${id}`, { method: "DELETE" });
  },
};