import { ensureJssdkReady, normalizeJssdkPageUrl } from './jssdk';
import { getRuntimePlatform, isWechatBrowser } from './env';
import type { WeixinSdkConfig } from './types';

export type WechatShareData = {
  title: string;
  desc: string;
  link: string;
  imgUrl: string;
};

export function canUseWechatShare(): boolean {
  return isWechatBrowser() || getRuntimePlatform() === 'mini';
}

function applyShareData(data: WechatShareData): Promise<void> {
  return new Promise((resolve, reject) => {
    const wx = window.wx as
      | (NonNullable<typeof window.wx> & {
          onMenuShareAppMessage?: (opts: Record<string, unknown>) => void;
          onMenuShareTimeline?: (opts: Record<string, unknown>) => void;
          invoke?: (
            api: string,
            params: Record<string, unknown>,
            cb?: (res: { err_msg?: string; errMsg?: string }) => void,
          ) => void;
        })
      | undefined;

    if (!wx) {
      reject(new Error('微信 JSSDK 不可用'));
      return;
    }

    let pending = 0;
    let failed = false;
    const done = (err?: Error) => {
      if (err && !failed) {
        failed = true;
        reject(err);
        return;
      }
      pending -= 1;
      if (pending === 0 && !failed) resolve();
    };

    const payload = {
      title: data.title,
      desc: data.desc,
      link: data.link,
      imgUrl: data.imgUrl,
    };

    if (wx.updateAppMessageShareData) {
      pending += 1;
      wx.updateAppMessageShareData({
        ...payload,
        success: () => done(),
        fail: (res) => done(new Error(res.errMsg || '设置分享给朋友失败')),
      });
    }

    if (wx.updateTimelineShareData) {
      pending += 1;
      wx.updateTimelineShareData({
        title: data.title,
        link: data.link,
        imgUrl: data.imgUrl,
        success: () => done(),
        fail: (res) => done(new Error(res.errMsg || '设置分享到朋友圈失败')),
      });
    }

    // 兼容旧微信：同时挂旧版菜单分享（设置即生效，无 success 回调也可继续）
    if (wx.onMenuShareAppMessage) {
      wx.onMenuShareAppMessage({
        ...payload,
        success: () => {},
        cancel: () => {},
      });
    }
    if (wx.onMenuShareTimeline) {
      wx.onMenuShareTimeline({
        title: data.title,
        link: data.link,
        imgUrl: data.imgUrl,
        success: () => {},
        cancel: () => {},
      });
    }

    if (pending === 0) {
      if (wx.onMenuShareAppMessage || wx.onMenuShareTimeline) {
        resolve();
        return;
      }
      reject(new Error('当前微信版本不支持分享，请升级微信后重试'));
    }
  });
}

/** 尽量调起系统分享面板（部分微信版本支持；失败则仅完成卡片配置） */
export function tryInvokeSharePanel(data: WechatShareData): Promise<boolean> {
  return new Promise((resolve) => {
    const wx = window.wx as
      | {
          invoke?: (
            api: string,
            params: Record<string, unknown>,
            cb?: (res: { err_msg?: string; errMsg?: string }) => void,
          ) => void;
        }
      | undefined;
    if (!wx?.invoke) {
      resolve(false);
      return;
    }
    try {
      wx.invoke(
        'shareAppMessage',
        {
          title: data.title,
          desc: data.desc,
          link: data.link,
          img_url: data.imgUrl,
          imgUrl: data.imgUrl,
        },
        (res) => {
          const msg = `${res?.err_msg || res?.errMsg || ''}`;
          resolve(/:ok\b/i.test(msg));
        },
      );
    } catch {
      resolve(false);
    }
  });
}

/** 配置微信内分享卡片（好友 / 朋友圈） */
export async function setWechatShareData(
  config: WeixinSdkConfig,
  data: WechatShareData,
): Promise<void> {
  if (!canUseWechatShare()) return;

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

  await applyShareData(data);
}

/**
 * 配置分享并尝试调起分享面板。
 * @returns invoked=true 表示已弹出系统分享；否则需引导用户点右上角
 */
export async function shareViaWechatSdk(
  config: WeixinSdkConfig,
  data: WechatShareData,
): Promise<{ invoked: boolean }> {
  await setWechatShareData(config, data);
  const invoked = await tryInvokeSharePanel(data);
  return { invoked };
}

/** 获取当前页分享链接（去掉 hash、OAuth 回跳参数） */
export function getWechatShareLink(rawUrl?: string): string {
  if (typeof window === 'undefined') return rawUrl ?? '';
  return normalizeJssdkPageUrl(rawUrl ?? window.location.href);
}