import readlinePromises from 'readline/promises';
import { existsSync } from 'fs';
import { mkdir, writeFile } from 'fs/promises';

const mapper = (inVal) => {
  const { data } = inVal;
  const outVal = {};

  // handle list basic fields
  outVal.title = data.title;
  
  // handle list entries
  outVal.entries = {};
  data.entries.forEach(entry => {
    // give it an id
    const id = `${(entry.date || '').replace(/ /gm,'_')}_${(entry.title || '').replace(/ /gm, '_')}_${entry.documentId}`;

    // copy all values at first...
    outVal.entries[id] = {...entry};

    // ...then delete strapi fields (as there are more to copy than delete)
    delete outVal.entries[id].id;
    delete outVal.entries[id].documentId;
    delete outVal.entries[id].createdAt;
    delete outVal.entries[id].updatedAt;
    delete outVal.entries[id].publishedAt;
    delete outVal.entries[id].locale;

    // ...then handle variants
    outVal.entries[id].variants = entry.variants.map(variant => ({
      alternativeText: variant.alternativeText,
      caption: variant.caption,
      // the images will currently be mapped to strapi, to be handled with file grabber
      url: variant.url,
      thumbnailUrl: variant.formats['thumbnail'].url, // TBD: non-image assets
    }));

    // ...also post-process tags into an array
    outVal.entries[id].tags = (outVal.entries[id].tags || '').split(/,| |;/).filter(val => val !== '');
  });

  return outVal;
};

(async () => {
  const rl = readlinePromises.createInterface(process.stdin, process.stdout);
  let fetchUrl = '';
  try {
    fetchUrl = await rl.question('Enter the URL to fetch from: ');
  } catch (err) {
    console.error('There was an error: ', err);
  } finally {
    if (!fetchUrl) {
      console.log('Invalid URL. Quitting...');
      rl.close();
      return;
    } else if (!fetchUrl.includes('?')) {
      fetchUrl += '?populate[0]=entries&populate[1]=entries.variants&populate[2]=tags&populate[3]=tags.value'
    }
  }

  let destination = '';
  try {
    destination = await rl.question('Enter the directory to save the response (note: start from sites/{your-site-here} for relative pathing): ');
  } catch (err) {
    console.error('There was an error: ', err);
  } finally {
    rl.close();
    if (!destination) {
      console.log('Invalid path. Quitting...');
      return;
    } else {
      if (!existsSync(destination)) {
        await mkdir(destination);
      }
    }
  }

  let res = {};
  try {
    res = await (await fetch(fetchUrl, {
      method: 'GET',
      headers: {
        'Content-Type': 'application/json',
      },
    })).json();
  } catch (err) {
    console.error('There was an error: ', err);
  }

  console.log('Writing...');
  try {
    await writeFile(`${destination}/in.json`, JSON.stringify(res, null, 2));
    let list = mapper(res);
    await writeFile(`${destination}/out.json`, JSON.stringify(list, null, 2));
  } catch (err) {
    console.error('There was an error: ', err)
  }
})();