const { Podcast } = require('podcast');
const music_metadata = require('music-metadata');
const fs = require('fs');

async function getMp3Duration(filePath) {
  try {
      const metadata = await music_metadata.parseFile(filePath);
      console.log('Duration:', metadata.format.duration, 'seconds');
      return metadata.format.duration; // Duration in seconds
  } catch (error) {
      console.error('Error reading file:', error.message);
      return null;
  }
}

class PodcastFeed {
  data() {
		return {
			// Writes to "/my-permalink/hello/index.html"
			permalink: (data) => `${data.page.filePathStem}.xml`,
		};
	}

  async render(data) {
		const feed = new Podcast({
      title: data.title,
      description: data.description,
      customNamespaces: {podcast:"https://github.com/Podcastindex-org/podcast-namespace/blob/main/docs/1.0.md"},
      feedUrl: `${data.site.url}${data.page.filePathStem}.xml`,
      siteUrl: data.site.url,
      imageUrl: data.site.imageUrl || `${data.site.url}${data.page.filePathStem}.jpg`,
      author: data.author || `${data.site.author.name}`,
      copyright: data.copyright || `${new Date().getFullYear()} ${data.site.author.name}`,
      language: 'en',
      categories: data.categories,
      pubDate: data.page.date,
      ttl: 60,
      itunesAuthor: data.itunes?.author || `${data.site.author.name}`,
      itunesSubtitle: data.itunes?.subtitle || '',
      itunesSummary: data.itunes?.summary || '',
      itunesOwner: { 
        name: data.itunes?.owner?.name || `${data.site.author.name}`,
        email: data.itunes?.owner?.email ||`${data.site.author.email}` 
      },
      itunesExplicit: data.itunes?.explicit || false,
      itunesCategory: [],
      itunesImage: data.itunes?.image || data.site.imageUrl || `${data.site.url}${data.page.filePathStem}.jpg`
    });

    const items = data.collections[data.episodeCollection]?.filter(episode=>episode.data.podcast!=false)
    var item
    items.forEach(episode=>{
      // const duration = getMp3Duration(`../episodes/s${zero_pad_season}/s${zero_pad_season}e${episode.data.episode}.mp3`)
       /* loop over data and add to feed */
      item = {
        title:  `${episode.data.podcast.title}`,
        description: episode.content,
        url: data.site.url+this.url(episode.url), // link to the item
        guid: episode.url, // optional - defaults to url
        date: episode.data.date, // any format that js Date can parse.
        enclosure : {url:`${episode.data.podcast.enclosureUrl}`}, // optional enclosure
        customElements: []
        // itunesDuration: duration,
      }
      if (episode.data.podcast.transcriptUrl) {
        item.customElements.push({ 'podcast:transcript': {_attr:{
          url:`${episode.data.podcast.transcriptUrl}`,
          type:"application/srt",
          language:"en-us"
        }}
      })
      console.log()
    }
      item = feed.addItem(item);

    })
   
  
    // cache the xml to send to clients
    const xml = feed.buildXml();
    return xml.replace('></podcast:transcript>',' />')
	}
}

module.exports = PodcastFeed