import { getApiConfig } from '../config/api';

interface ApiEnvelope<T> {
    code: number;
    message: string;
    data: T;
    requestId?: string;
}

/** 保留有限的状态用于页面反馈，不把服务器原始响应或凭证输出到界面。 */
export class ApiRequestError extends Error {
    constructor(
        message: string,
        readonly statusCode: number = 0,
    ) {
        super(message);
        this.name = 'ApiRequestError';
    }
}

/** 新后端统一请求层：校验 HTTP 与业务状态，旧云函数/CDN 请求保持独立。 */
export async function apiRequest<T>(
    path: string,
    options: {
        method?: 'GET' | 'POST' | 'PUT' | 'DELETE';
        data?: Record<string, unknown>;
        header?: Record<string, string>;
    } = {},
): Promise<T> {
    const config = getApiConfig();
    if (!path.startsWith('/') || path.startsWith('//'))
        throw new Error('接口路径不正确');
    return new Promise((resolve, reject) => {
        wx.request<ApiEnvelope<T>>({
            url: `${config.baseUrl}${path}`,
            method: options.method || 'GET',
            data: options.data,
            header: { 'Content-Type': 'application/json', ...options.header },
            timeout: config.timeout,
            success(res) {
                if (res.statusCode < 200 || res.statusCode >= 300) {
                    reject(
                        new ApiRequestError(
                            res.statusCode === 404
                                ? '内容暂不可用'
                                : '接口请求失败，请稍后重试',
                            res.statusCode,
                        ),
                    );
                    return;
                }
                if (
                    !res.data ||
                    res.data.code !== 0 ||
                    !Object.prototype.hasOwnProperty.call(res.data, 'data')
                ) {
                    reject(
                        new ApiRequestError(
                            '接口返回异常，请稍后重试',
                            res.statusCode,
                        ),
                    );
                    return;
                }
                resolve(res.data.data);
            },
            fail() {
                reject(
                    new ApiRequestError('连接失败，请确认后端已启动及网络配置'),
                );
            },
        });
    });
}