import { authApi } from './auth';

// 设置token到localStorage
export const setToken = (token: string) => {
  if (typeof window !== 'undefined') {
    localStorage.setItem('token', token);
  }
};

// 获取token
export const getToken = (): string | null => {
  if (typeof window !== 'undefined') {
    return localStorage.getItem('token');
  }
  return null;
};

// 清除token
export const clearToken = () => {
  if (typeof window !== 'undefined') {
    localStorage.removeItem('token');
    localStorage.removeItem('userInfo');
    localStorage.removeItem('token_expired');
    localStorage.removeItem('s2_accountId');
  }
};

// 验证token是否有效
export const validateToken = async (): Promise<boolean> => {
  try {
    const response = await authApi.getUserInfo();
    return response.code === 200;
  } catch (error) {
    console.error('Token验证失败:', error);
    return false;
  }
};

// 刷新令牌
export const refreshAuthToken = async (): Promise<boolean> => {
  if (typeof window === 'undefined') {
    return false;
  }
  
  try {
    const response = await authApi.refreshToken();
    if (response.code === 200 && response.data?.token) {
      setToken(response.data.token);
      // 更新过期时间
      if (response.data.token_expired) {
        localStorage.setItem('token_expired', response.data.token_expired);
      }
      return true;
    }
    return false;
  } catch (error) {
    console.error('刷新Token失败:', error);
    return false;
  }
};

// 检查token是否即将过期
export const isTokenExpiringSoon = (): boolean => {
  if (typeof window === 'undefined') {
    return false;
  }
  
  const tokenExpired = localStorage.getItem('token_expired');
  if (!tokenExpired) return true;
  
  try {
    const expiredTime = new Date(tokenExpired).getTime();
    const currentTime = new Date().getTime();
    // 提前10分钟认为即将过期
    return currentTime >= (expiredTime - 10 * 60 * 1000);
  } catch (error) {
    console.error('解析token过期时间失败:', error);
    return true;
  }
};

// 检查token是否已过期
export const isTokenExpired = (): boolean => {
  if (typeof window === 'undefined') {
    return false;
  }
  
  const tokenExpired = localStorage.getItem('token_expired');
  if (!tokenExpired) return true;
  
  try {
    const expiredTime = new Date(tokenExpired).getTime();
    const currentTime = new Date().getTime();
    // 提前5分钟认为过期，给刷新留出时间
    return currentTime >= (expiredTime - 5 * 60 * 1000);
  } catch (error) {
    console.error('解析token过期时间失败:', error);
    return true;
  }
};

// 请求去重器
class RequestDeduplicator {
  private pendingRequests = new Map<string, Promise<any>>();

  async deduplicate<T>(key: string, requestFn: () => Promise<T>): Promise<T> {
    if (this.pendingRequests.has(key)) {
      return this.pendingRequests.get(key)!;
    }

    const promise = requestFn();
    this.pendingRequests.set(key, promise);

    try {
      const result = await promise;
      return result;
    } finally {
      this.pendingRequests.delete(key);
    }
  }

  getPendingCount(): number {
    return this.pendingRequests.size;
  }

  clear(): void {
    this.pendingRequests.clear();
  }
}

// 请求取消管理器
class RequestCancelManager {
  private abortControllers = new Map<string, AbortController>();

  createController(key: string): AbortController {
    // 取消之前的请求
    this.cancelRequest(key);
    
    const controller = new AbortController();
    this.abortControllers.set(key, controller);
    return controller;
  }

  cancelRequest(key: string): void {
    const controller = this.abortControllers.get(key);
    if (controller) {
      controller.abort();
      this.abortControllers.delete(key);
    }
  }

  cancelAllRequests(): void {
    this.abortControllers.forEach(controller => controller.abort());
    this.abortControllers.clear();
  }

  getController(key: string): AbortController | undefined {
    return this.abortControllers.get(key);
  }
}

// 导出单例实例
export const requestDeduplicator = new RequestDeduplicator();
export const requestCancelManager = new RequestCancelManager(); 

/**
 * 通用文件上传方法（支持图片、文件）
 * @param {File} file - 要上传的文件对象
 * @param {string} [uploadUrl='/v1/attachment/upload'] - 上传接口地址
 * @returns {Promise<string>} - 上传成功后返回文件url
 */
export async function uploadFile(file: File, uploadUrl: string = '/v1/attachment/upload'): Promise<string> {
  const formData = new FormData();
  formData.append('file', file);
  const token = typeof window !== 'undefined' ? localStorage.getItem('token') : '';
  const headers: Record<string, string> = {};
  if (token) headers['Authorization'] = `Bearer ${token}`;
  try {
    const response = await fetch(uploadUrl, {
      method: 'POST',
      headers,
      body: formData,
    });
    const res = await response.json();
    if (res?.url) {
      return res.url;
    }
    if (res?.data?.url) {
      return res.data.url;
    }
    throw new Error(res?.msg || '文件上传失败');
  } catch (e: any) {
    throw new Error(e?.message || '文件上传失败');
  }
}