const m = require('mithril')
const ApiArticle = require('../api/article.p')
const Authentication = require('../authentication')
const Fileinfo = require('../widgets/fileinfo')
const EditorBlock = require('../widgets/editorblock')

const Article = {
  oninit: function(vnode) {
    this.error = ''
    this.loading = false
    this.showLoading = null
    this.data = {
      article: null,
      files: [],
      pictureFallback: null,
      pictureJpeg: null,
      pictureAvif: null,
      pictureCover: null,
    }
    this.showcomments = false

    if (window.__nfpdata) {
      this.path = m.route.param('id')
      this.data.article = window.__nfpdata
      window.__nfpdata = null
    } else {
      this.fetchArticle(vnode)
    }
  },

  onbeforeupdate: function(vnode) {
    if (this.path !== m.route.param('id')) {
      this.fetchArticle(vnode)
    }
  },

  fetchArticle: function(vnode) {
    this.error = ''
    this.path = m.route.param('id')
    this.showcomments = false

    if (this.showLoading) {
      clearTimeout(this.showLoading)
    }

    if (this.data.article) {
      this.showLoading = setTimeout(() => {
        this.showLoading = null
        this.loading = true
        m.redraw()
      }, 150)
    } else {
      this.loading = true
    }

    ApiArticle.getArticle(this.path)
    .then((result) => {
      this.data = result

      if (this.data.article.media_alt_prefix) {
        this.data.article.pictureFallback = this.data.article.media_alt_prefix + '_small.jpg'
        this.data.article.pictureJpeg = this.data.article.media_alt_prefix + '_small.jpg' + ' 720w, '
                        + this.data.article.media_alt_prefix + '_medium.jpg' + ' 1300w, '
                        + this.data.article.media_alt_prefix + '_large.jpg  1920w'
        this.data.article.pictureAvif = this.data.article.media_alt_prefix + '_small.avif' + ' 720w, '
                        + this.data.article.media_alt_prefix + '_medium.avif' + ' 1300w, '
                        + this.data.article.media_alt_prefix + '_large.avif 1920w'
  
        this.data.article.pictureCover = '(max-width: 840px) calc(100vw - 82px), '
                        + '758px'
      } else {
        this.data.article.pictureFallback = null
        this.data.article.pictureJpeg = null
        this.data.article.pictureAvif = null
        this.data.article.pictureCover = null
      }

      if (!this.data.article) {
        this.error = 'Article not found'
      }
    }, (err) => {
      this.error = err.message
    })
    .then(() => {
      clearTimeout(this.showLoading)
      this.showLoading = null
      this.loading = false
      m.redraw()
    })
  },

  view: function(vnode) {
    let article = this.data.article
    return (
      this.loading ?
        m('article.article', m('div.loading-spinner'))
      : this.error
        ? m('div.error-wrapper', m('div.error', {
            onclick: function() {
              vnode.state.error = ''
              vnode.state.fetchArticle(vnode)
            },
          }, 'Article error: ' + this.error))
        : m('article.article', [
            article.page_path
              ? m('div.goback', ['« ', m(m.route.Link, { href: '/page/' + article.page_path }, article.page_name)])
              : null,
            m('header', m('h1', article.name)),
            m('.fr-view', [
              article.pictureFallback
                ? m('a.cover', {
                    rel: 'noopener',
                    href: article.media_path,
                  }, [
                    m('picture', [
                      m('source', {
                        srcset: article.pictureAvif,
                        sizes: article.pictureCover,
                        type: 'image/avif',
                      }),
                      m('img', {
                        srcset: article.pictureJpeg,
                        sizes: article.pictureCover,
                        alt: 'Image for news item ' + article.name,
                        src: article.pictureFallback,
                      }),
                    ]),
                  ])
                : null,
              article.content.blocks.map(block => {
                return m(EditorBlock, { block: block })
              }),
              this.data.files.map(function(file) {
                return m(Fileinfo, { file: file })
              }),
              m('div.entrymeta', [
                'Posted ',
                article.page_path
                  ? [
                      'in',
                      m(m.route.Link, { href: '/page/' + article.page_path }, article.page_name)
                    ]
                  : '',
                'at ' + (article.publish_at.replace('T', ' ').split('.')[0]).substr(0, 16),
                ' by ' + (article.admin_name || 'Admin'),
              ]),
            ]),
            Authentication.currentUser
              ? m('div.admin-actions', [
                m('span', 'Admin controls:'),
                m(m.route.Link, { href: '/admin/articles/' + article.path }, 'Edit article'),
              ])
              : null,
            this.showcomments
              ? m('div.commentcontainer', [
                  m('div#disqus_thread', { oncreate: function() {
                    let fullhost = window.location.protocol + '//' + window.location.host
                    /*eslint-disable */
                    window.disqus_config = function () {
                      this.page.url = fullhost + '/article/' + vnode.state.article.path
                      this.page.identifier = 'article-' + vnode.state.article.id
                    };
                    (function() { // DON'T EDIT BELOW THIS LINE
                      var d = document, s = d.createElement('script');
                      s.src = 'https://nfp-moe.disqus.com/embed.js';
                      s.setAttribute('data-timestamp', +new Date());
                      (d.head || d.body).appendChild(s);
                    })()
                    /*eslint-enable */
                  }}, m('div.loading-spinner')),
                ])
              : m('button.opencomments', {
                  onclick: function() { vnode.state.showcomments = true },
                }, 'Open comment discussion'),
          ])
    )
  },
}

module.exports = Article

/*
<div id="disqus_thread"></div>
<script>

/**
*  RECOMMENDED CONFIGURATION VARIABLES: EDIT AND UNCOMMENT THE SECTION BELOW TO INSERT DYNAMIC VALUES FROM YOUR PLATFORM OR CMS.
*  LEARN WHY DEFINING THESE VARIABLES IS IMPORTANT: https://disqus.com/admin/universalcode/#configuration-variables*/
/*
var disqus_config = function () {
this.page.url = PAGE_URL;  // Replace PAGE_URL with your page's canonical URL variable
this.page.identifier = PAGE_IDENTIFIER; // Replace PAGE_IDENTIFIER with your page's unique identifier variable
};
/
(function() { // DON'T EDIT BELOW THIS LINE
var d = document, s = d.createElement('script');
s.src = 'https://nfp-moe.disqus.com/embed.js';
s.setAttribute('data-timestamp', +new Date());
(d.head || d.body).appendChild(s);
})();
</script>
<noscript>Please enable JavaScript to view the <a href="https://disqus.com/?ref_noscript">comments powered by Disqus.</a></noscript>
*/