import { isWechatMiniProgramWebViewRuntime } from './authService';

const WECHAT_JS_SDK_URL = 'https://res.wx.qq.com/open/js/jweixin-1.6.0.js';
const SHARE_GRID_PAGE_URL = '/pages/share-grid/index';

function loadWechatMiniProgramBridge() {
  if (
    typeof window === 'undefined' ||
    !isWechatMiniProgramWebViewRuntime()
  ) {
    return Promise.reject(new Error('not_mini_program'));
  }

  if (window.wx?.miniProgram?.navigateTo) {
    return Promise.resolve(window.wx);
  }

  return new Promise<NonNullable<Window['wx']>>((resolve, reject) => {
    const existingScript = document.querySelector<HTMLScriptElement>(
      `script[src="${WECHAT_JS_SDK_URL}"]`,
    );
    const complete = () => {
      if (window.wx?.miniProgram?.navigateTo) {
        resolve(window.wx);
      } else {
        reject(new Error('wechat_js_sdk_unavailable'));
      }
    };

    if (existingScript) {
      existingScript.addEventListener('load', complete, { once: true });
      existingScript.addEventListener(
        'error',
        () => reject(new Error('wechat_js_sdk_load_failed')),
        { once: true },
      );
      complete();
      return;
    }

    const script = document.createElement('script');
    script.src = WECHAT_JS_SDK_URL;
    script.async = true;
    script.onload = complete;
    script.onerror = () => reject(new Error('wechat_js_sdk_load_failed'));
    document.head.appendChild(script);
  });
}

function buildAbsoluteUrl(value: string) {
  if (typeof window === 'undefined') {
    return value;
  }

  return new URL(value, window.location.origin).href;
}

export function canUseWechatMiniProgramShareGrid() {
  return isWechatMiniProgramWebViewRuntime();
}

export async function openWechatMiniProgramShareGridPage(params: {
  imageUrl: string;
  title: string;
  publicWorkCode: string;
}) {
  const imageUrl = params.imageUrl.trim();
  if (!imageUrl) {
    return false;
  }

  const wxBridge = await loadWechatMiniProgramBridge();
  const miniProgram = wxBridge.miniProgram;
  if (!miniProgram?.navigateTo) {
    return false;
  }

  const searchParams = new URLSearchParams({
    imageUrl: buildAbsoluteUrl(imageUrl),
    title: params.title.trim() || '我的作品',
    publicWorkCode: params.publicWorkCode.trim(),
  });
  const url = `${SHARE_GRID_PAGE_URL}?${searchParams.toString()}`;

  return await new Promise<boolean>((resolve) => {
    miniProgram.navigateTo?.({
      url,
      success() {
        resolve(true);
      },
      fail() {
        resolve(false);
      },
    });
  });
}