Genarrative/src/services/wechatMiniProgramShareTarget.ts

import { setHostShareTarget } from './host-bridge/hostBridge';

const MESSAGE_TYPE = 'genarrative:share-target';

export type WechatMiniProgramShareTarget = {
  targetPath: '/works/detail';
  work: string;
  title?: string | null;
};

function normalizeShareTarget(
  target: WechatMiniProgramShareTarget | null | undefined,
) {
  const work = target?.work?.trim() ?? '';
  if (!work) {
    return null;
  }

  return {
    targetPath: '/works/detail' as const,
    work,
    title: target?.title?.trim() || undefined,
  };
}

export function buildWechatMiniProgramShareTargetMessage(
  target: WechatMiniProgramShareTarget | null | undefined,
) {
  const normalizedTarget = normalizeShareTarget(target);
  return normalizedTarget
    ? {
        type: MESSAGE_TYPE,
        payload: normalizedTarget,
      }
    : null;
}

export function postWechatMiniProgramShareTarget(
  target: WechatMiniProgramShareTarget | null | undefined,
) {
  const message = buildWechatMiniProgramShareTargetMessage(target);
  if (!message) {
    return false;
  }

  // 中文注释：微信 web-view 会在分享等时机把 postMessage 数据交给原生页，
  // 小程序页据此把右上角系统分享指向当前推荐作品。
  return setHostShareTarget(message);
}