/**
 * 统一请求封装（基于 Nuxt 内置 ofetch）
 *
 * 与 dashboard 后端约定响应格式：{ code, msg, data }
 * - code = 1：成功
 * - code = 0：业务错误
 * - code = 2：无数据
 */

import { resolveAssetUrls } from '~/utils/resolveAssetUrl';

export interface ApiResponse<T = unknown> {
  code: number;
  msg: string;
  data: T | null;
}

export class ApiError extends Error {
  code: number;
  constructor(msg: string, code: number) {
    super(msg);
    this.code = code;
  }
}

export function useRequest() {
  const config = useRuntimeConfig();
  const baseURL = config.public.apiBaseUrl as string;

  async function request<T = unknown>(url: string, options?: Parameters<typeof $fetch>[1]): Promise<T | null> {
    const res = await $fetch<ApiResponse<T>>(url, {
      baseURL,
      ...options
    });

    if (res.code === 0) {
      throw new ApiError(res.msg || '请求失败', res.code);
    }

    // code = 2（无数据）时 data 为 null，正常返回
    // 统一解析 *_url / *_path 字段中的相对路径（如 /uploads/...）为完整资源地址
    return resolveAssetUrls(res.data);
  }

  function get<T = unknown>(url: string, params?: Record<string, unknown>) {
    return request<T>(url, { method: 'GET', params });
  }

  function post<T = unknown>(url: string, body?: Record<string, unknown>) {
    return request<T>(url, { method: 'POST', body });
  }

  /** POST multipart/form-data（文件上传；ofetch 自动设置 boundary） */
  function postForm<T = unknown>(url: string, body: FormData) {
    return request<T>(url, { method: 'POST', body });
  }

  return { request, get, post, postForm };
}