class PandoraScroll extends HTMLElement {
  constructor() {
    super()

    if (this.attributes.src && this.attributes.src.value) {
        const attributes = parseIframeURL(this.attributes.src.value)
        Object.keys(attributes).forEach(key => {
            if (key[0] != '_') {
                this.setAttribute(key, attributes[key])
            }
        })
    }
    const shadow = this.attachShadow({mode: 'open'})
    const link = document.createElement('link')
    link.rel = 'stylesheet'
    link.href = document.head.querySelector('link[rel="stylesheet"]').href
    const style = document.createElement('style')
    const body = document.createElement('div')
    body.classList.add('pandora-scroll')
    shadow.appendChild(link)
    shadow.appendChild(style)
    shadow.appendChild(body)
    window.addEventListener('resize', () => {
        this._resize()
    }, false)

    this.mute = function() {
        shadow.querySelectorAll('video').forEach(video => {
            video.muted = true
        })
    }
  }


    static get observedAttributes() { return ['muted']; }

    connectedCallback() {
      this._loadAnnotations()
      this._updateStyle()
    }
    disconnectedCallback() {
      //console.log('scroll disconnected')
    }
    adoptedCallback() {
      //console.log('element moved to new page.');
    }

    attributeChangedCallback(name, oldValue, newValue) {
      //console.log('value changed', name, oldValue, newValue);
      this._updateStyle()
    }
    _updateStyle() {
        const shadow = this.shadowRoot;
        const childNodes = shadow.childNodes;
        for (const node of childNodes) {
          if (node.nodeName === 'STYLE') {
            node.textContent = `
              .pandora-scroll {
                  position: relative;
                  display: block;
              }
            `
          }
        }
    }

    _config() {
      var config = {}
      for (var i=0; i<this.attributes.length; i++) {
          var a = this.attributes[i]
          config[a.name] = a.value
          if (a.name == 'layers') {
              config[a.name] = a.value.split(' ')
          } else if (['in', 'out'].indexOf(a.name) > -1) {
              config[a.name] = parseTime(a.value)
          } else {
              config[a.name] = a.value
          }
      }
      return config
    }
    _loadAnnotations() {
          var config = this._config()
          config.root = this.shadowRoot.querySelector('.pandora-scroll')
          config.video = document.querySelector('video')
          loadAnnotations(config).then(config => {
            config.annotations.forEach(annotation => {
                annotation.src = `${streamPrefix}/${annotation.id.split('/')[0]}/480p.webm`
                renderAnnotation(window.config, config.video, config.root, annotation)
            })
          })
    }

    _resize() {
        var video = this.shadowRoot.querySelector('video')
        if (video && video._frame) {
            var rect = video._frame.getBoundingClientRect(),
                root_rect = video._root.getBoundingClientRect(),
                top = rect.top - root_rect.top;
            video.style.top = top + 'px'
        }
    }
}

class PandoraItem extends HTMLElement {
  constructor() {
    super()
    }
}
class PandoraEdit extends HTMLElement {
  constructor() {
    super()
    }
}

customElements.define("pandora-scroll", PandoraScroll);
customElements.define("pandora-item", PandoraItem);
customElements.define("pandora-edit", PandoraEdit);


function parseIframeURL(value) {
    var config = {}
    value = value.replace('/player/', '/')
    value = value.replace('/editor/', '/')
    var data = value.split('#embed?')
    function decodeValue(value) {
        return decodeURIComponent(value)
            .replace(/_/g, ' ').replace(/\t/g, '_')
            .replace(/\x0E/g, '<').replace(/\x0F/g, '>');
    }
    var args = data[1].replace('&amp;', '&').split('&').map(kv => {
        kv = kv.split('=')
        //console.log(kv, decodeValue(kv[1]))
        return [kv[0], JSON.parse(decodeValue(kv[1]))]
    }).reduce((k, v) =>  {
        k[v[0]]  = v[1]
        return k
    }, {})
    var parts = data[0].split('/')
    config.item = parts[3]
    var ts = parts[4].split(',')
    config['in'] = ts[0]
    config['out'] = ts[1]
    config._args = args
    if (args.showLayers) {
        config.layers = args.showLayers.join(' ')
    }
    if (args.showTimeline) {
        config.timeline = "slitscan"
    }
    return config
}