import Taro from '@tarojs/taro';
import { BRAND_LOGO_URL } from '@dukang/shared-types';
import type { WechatShareData } from '@dukang/weixin-sdk';
import { getWechatShareLink, isWechatBrowser, isMiniProgram } from '@dukang/weixin-sdk';
import { toast } from './api';
import { isWechatEnv, weixinSdk } from './weixin';

export const DEFAULT_SHARE_TITLE = '你吃饭，杜康买单';
export const DEFAULT_SHARE_DESC = '杜康好客 · 买美酒，享好礼，全城门店可用';
export const WECHAT_SHARE_HINT = '请点击右上角 ··· 分享给好友';

export function getDefaultShareImageUrl(): string {
  return BRAND_LOGO_URL;
}

export function buildDefaultShareData(
  overrides?: Partial<WechatShareData>,
): WechatShareData {
  let link = overrides?.link;
  if (!link) {
    if (process.env.TARO_ENV === 'h5' && typeof window !== 'undefined') {
      link = getWechatShareLink();
    } else {
      link = '';
    }
  }
  return {
    title: overrides?.title ?? DEFAULT_SHARE_TITLE,
    desc: overrides?.desc ?? DEFAULT_SHARE_DESC,
    link,
    imgUrl: overrides?.imgUrl ?? getDefaultShareImageUrl(),
  };
}

/** 配置 H5 微信内右上角分享卡片 */
export async function applyWechatShare(
  overrides?: Partial<WechatShareData>,
): Promise<void> {
  if (process.env.TARO_ENV !== 'h5') return;
  if (!isWechatBrowser()) return;
  await weixinSdk.setShare(buildDefaultShareData(overrides));
}

export type PageSharePayload = {
  title?: string;
  desc?: string;
  /** 小程序分享 path，如 /pages/product-detail/index?id=1 */
  path?: string;
  imgUrl?: string;
  /** H5 自定义分享 link，默认当前页 */
  link?: string;
};

/**
 * 点击「分享」按钮。
 * H5：走微信 JSSDK 配置分享卡片，并尝试 invoke 调起面板；否则返回需展示引导蒙层。
 */
export async function handleShareButtonClick(
  payload?: PageSharePayload,
): Promise<{ showGuide: boolean }> {
  if (process.env.TARO_ENV === 'weapp' || isMiniProgram()) {
    try {
      await Taro.showShareMenu({ withShareTicket: true, showShareItems: ['shareAppMessage', 'shareTimeline'] });
    } catch {
      try {
        await Taro.showShareMenu({ withShareTicket: true });
      } catch {
        /* ignore */
      }
    }
    toast(WECHAT_SHARE_HINT);
    return { showGuide: false };
  }

  if (!isWechatEnv()) {
    toast('请在微信内打开后分享');
    return { showGuide: false };
  }

  const data = buildDefaultShareData({
    title: payload?.title,
    desc: payload?.desc,
    imgUrl: payload?.imgUrl,
    link: payload?.link,
  });

  try {
    const result = await weixinSdk.share(data);
    if (result.invoked) {
      return { showGuide: false };
    }
    toast(WECHAT_SHARE_HINT);
    return { showGuide: true };
  } catch (e) {
    toast(e instanceof Error ? e.message : '分享配置失败，请刷新后重试');
    return { showGuide: true };
  }
}

/** 供 useShareAppMessage 使用的标题/路径/图 */
export function toWeappShareMessage(payload?: PageSharePayload) {
  return {
    title: payload?.title || DEFAULT_SHARE_TITLE,
    path: payload?.path || '/pages/home/index',
    imageUrl: payload?.imgUrl || getDefaultShareImageUrl(),
  };
}