import { ensureJssdkReady } from './jssdk';
import type { WeixinSdkConfig } from './types';

export function isHttpImageUrl(url?: string | null): url is string {
  return !!url && /^https?:\/\//i.test(url.trim());
}

/** 微信内预览图片，便于长按保存到相册（须是可公网访问的 http(s) 地址） */
export async function previewWechatImage(config: WeixinSdkConfig, url: string): Promise<void> {
  const href = url.trim();
  if (!isHttpImageUrl(href)) {
    throw new Error('图片地址无效');
  }

  await ensureJssdkReady({
    apiBase: config.apiBase ?? '/api/v1',
    clientApp: config.clientApp,
    getAccessToken: config.getAccessToken,
  });

  if (!window.wx?.previewImage) {
    throw new Error('微信预览图片不可用');
  }

  await new Promise<void>((resolve, reject) => {
    window.wx!.previewImage!({
      current: href,
      urls: [href],
      success: () => resolve(),
      fail: (res) => reject(new Error(res?.errMsg || '预览失败')),
    });
  });
}