import { AxiosInstance, AxiosResponse } from 'axios';
/**
 * Configuration options for the BaseApiClient.
 *
 * @interface BaseApiClientConfig
 * @property {string} baseUrl - The base URL for all API requests
 * @property {string} [urlPrefix] - Optional URL prefix to append to baseUrl (e.g., '/v1' for versioning)
 *
 * @example
 * const config: BaseApiClientConfig = {
 *   baseUrl: 'https://api.example.com',
 *   urlPrefix: '/v1'
 * };
 */
export interface BaseApiClientConfig {
    baseUrl: string;
    urlPrefix?: string;
}
/**
 * Base API client class providing common request handling functionality.
 * All specific API clients should extend this class.
 *
 * This class manages HTTP requests using axios and maintains custom headers
 * that are sent with every request. Headers are stored in the client instance
 * (not in axios defaults) for better reliability and explicit control.
 *
 * @abstract
 * @class BaseApiClient
 *
 * @example
 * class UserApiClient extends BaseApiClient {
 *   async getUser(id: number) {
 *     return this.request({
 *       path: `/users/${id}`,
 *       method: 'GET'
 *     });
 *   }
 * }
 *
 * const client = new UserApiClient({
 *   baseUrl: 'https://api.example.com',
 *   urlPrefix: '/v1'
 * });
 *
 * client.setHeaders({ 'Authorization': 'Bearer token123' });
 * const user = await client.getUser(1);
 */
export declare abstract class BaseApiClient {
    protected config: BaseApiClientConfig;
    protected axiosInstance: AxiosInstance;
    protected customHeaders: Record<string, string>;
    /**
     * Creates a new base API client instance.
     *
     * Initializes the axios instance with the provided configuration and
     * sets up default headers (Content-Type: application/json).
     * Headers are managed in the client instance for explicit control.
     *
     * @param {BaseApiClientConfig} config - The configuration options for the API client
     * @param {string} config.baseUrl - The base URL for all API requests
     * @param {string} [config.urlPrefix] - Optional URL prefix (e.g., '/v1')
     *
     * @example
     * constructor(config: BaseApiClientConfig) {
     *   super(config);
     * }
     */
    constructor(config: BaseApiClientConfig);
    /**
     * Sets headers for all subsequent requests.
     *
     * Headers are stored in the client instance and passed explicitly with each request.
     * This provides better reliability compared to using axios default headers.
     * Headers set to null will be deleted.
     *
     * @param {Record<string, string | null>} headers - Object containing headers to set.
     *        Use null as a value to delete a header.
     *
     * @example
     * // Set custom headers
     * client.setHeaders({
     *   'X-Request-Id': 'req-123',
     *   'Authorization': 'Bearer token123'
     * });
     *
     * // Remove a header
     * client.setHeaders({ 'X-Request-Id': null });
     */
    setHeaders(headers: Record<string, string | null>): void;
    /**
     * Gets the current headers.
     *
     * Returns a copy of all current headers stored in the client instance.
     * This includes default headers (Content-Type) and any custom headers set via setHeaders().
     *
     * @returns {Record<string, string>} A copy of all current headers
     *
     * @example
     * const headers = client.getHeaders();
     * console.log(headers['Content-Type']); // 'application/json'
     * console.log(headers['Authorization']); // 'Bearer token123' (if set)
     */
    getHeaders(): Record<string, string>;
    /**
     * Makes an HTTP request to the API.
     *
     * Sends a request to the API with the specified configuration and current headers.
     * Headers are explicitly passed with each request for reliable header management.
     * Handles both successful responses and axios errors.
     *
     * When an error occurs, the full response data is bound to the Error instance via the
     * `response` property, allowing access to structured error information from the server.
     *
     * @template T The expected response data type
     * @param {Object} options - Request configuration options
     * @param {string} options.path - The API endpoint path (e.g., '/users/1')
     * @param {Record<string, string | number | undefined>} [options.query] - Optional query parameters
     * @param {any} [options.body] - Optional request body for POST/PUT/PATCH requests
     * @param {string} [options.method='GET'] - HTTP method (GET, POST, PUT, PATCH, DELETE)
     * @returns {Promise<T>} The parsed response data
     * @throws {Error} If the request fails, returns an error status code, or response has success: false.
     *         The error object will have a `response` property containing the full error response data.
     *
     * @example
     * // GET request
     * const user = await this.request({
     *   path: '/users/1',
     *   method: 'GET'
     * });
     *
     * // Handling errors with structured error data
     * try {
     *   await this.request({ path: '/users', method: 'POST', body: data });
     * } catch (error: any) {
     *   console.log(error.message);           // 'Validation Error'
     *   console.log(error.response.code);     // 'VALIDATION_ERROR'
     *   console.log(error.response.errors);   // array of field errors
     * }
     *
     * // GET with query parameters
     * const users = await this.request({
     *   path: '/users',
     *   method: 'GET',
     *   query: { page: 1, limit: 10 }
     * });
     */
    protected request<T>(options: {
        path: string;
        query?: Record<string, string | number | undefined>;
        body?: any;
        method?: "GET" | "POST" | "PUT" | "PATCH" | "DELETE";
    }): Promise<T>;
    /**
     * Handles API response parsing and error checking.
     *
     * Validates the response status code and checks for error indicators in the response data.
     * Supports two error patterns:
     * 1. HTTP error status codes (< 200 or >= 300)
     * 2. JSON response with success: false field
     *
     * Priority for error messages: error field > message field > statusText
     *
     * When an error is thrown, the response data is bound to the Error instance via the
     * `response` property, making the full error details accessible to callers.
     *
     * @template T The expected response data type
     * @param {AxiosResponse} response - The axios Response object
     * @returns {T} The parsed and validated response data
     * @throws {Error} If the response indicates an error or has success: false.
     *         The error object will have a `response` property containing the response data.
     *
     * @example
     * // Successful response
     * const data = handleResponse({ status: 200, data: { id: 1, name: 'John' } });
     *
     * // Error with success: false
     * // throws Error('Operation failed') with error.response = { success: false, error: 'Operation failed', ... }
     * const data = handleResponse({
     *   status: 200,
     *   data: { success: false, error: 'Operation failed' }
     * });
     *
     * // HTTP error status
     * // throws Error('Not Found') with error.response = { error: 'Resource not found', code: 'NOT_FOUND', ... }
     * const data = handleResponse({
     *   status: 404,
     *   statusText: 'Not Found',
     *   data: { error: 'Resource not found', code: 'NOT_FOUND' }
     * });
     *
     * // Usage:
     * // try {
     * //   await client.getUser(1);
     * // } catch (error: any) {
     * //   console.log(error.message); // 'Not Found'
     * //   console.log(error.response); // { error: 'Resource not found', code: 'NOT_FOUND', ... }
     * // }
     */
    protected handleResponse<T>(response: AxiosResponse): T;
}