import * as puppeteer from 'puppeteer'; // eslint-disable-line

import {DataCache} from '../dataCache'; // eslint-disable-line
import {fetchResult, fetchOptions} from '../typings'; // eslint-disable-line

export default function unsplash(options: fetchOptions) {
  return new Promise<fetchResult>(async (resolve, reject) => {
    const {page, searchWord} = options;
    const host = 'https://ja.wikipedia.org';
    const encodedWord = encodeURI(searchWord);

    const dataCacheInstance = DataCache.getInstance();
    const dataCache = await dataCacheInstance.readData();

    const url = `${host}/wiki/${encodedWord}`;

    if (dataCache[url]) {
      resolve(dataCache[url]);
      return;
    }

    await page.goto(url);

    let entryHandle;
    try {
      await page.waitForSelector('.infobox img', {
        timeout: 10000,
      });
      entryHandle = await page.$('.infobox img');
    } catch (err) {}

    if (!entryHandle) {
      resolve({});
      return;
    }

    const copyright = `<a href="${page.url()}">Wikipedia</a>`;

    try {
      let thumbUrl = await page.evaluate((entry: Element) => {
        if (!entry) {
          return;
        }
        return entry.getAttribute('src').replace(/[0-9]+px-/, '1000px-');
      }, entryHandle);

      entryHandle.dispose();

      if (thumbUrl) {
        thumbUrl = `https:${thumbUrl}`;
      }

      dataCache[url] = {thumbUrl, copyright};
      dataCacheInstance.updateCacheFile();

      resolve(dataCache[url]);
    } catch (err) {
      reject(err);
    }
  });
}