/*
 * Lightbox window
 */
// import Events from './_events'
const W = window

class MetaWindow {
  state = {
    content: '',
    type: ['empty'],
    shown: false,
    loading: false,
    error: false,
    embed: false,
    collections: [],
    current: null,
    target: null,
    extraClass: null,
  }

  cleanLinks () {
    document.querySelectorAll('[data-toggle="lightbox"]')
      .forEach((el) => {
        el.classList.remove('loading')
      })
  }

  collectGaleries (gallery) {
    const ui = this

    if (!gallery) {
      return
    }

    ui.state.collections[gallery] = []
    document
      .querySelectorAll(
        `[data-toggle="lightbox"][data-gallery="${gallery}"]`
      )
      .forEach((el) => {
        ui.state.collections[gallery].push(el)
      })
  }

  toggle (el) {
    const ui = this

    ui.cleanLinks()

    const link = el.getAttribute('href') || el.getAttribute('data-href')
    const embed = el.getAttribute('data-embed')
    el.classList.add('loading')
    ui.state.current = el

    const title = el.getAttribute('data-title')
    if (title) {
      ui.setCaption(title)
    }

    if (embed) {
      ui.embed(link)
    } else {
      ui.load(link)
    }

    ui.addExtraClass(el.getAttribute('data-lightbox-class'))
  }

  init () {
    const ui = this
    console.log('MetaWindow: [links] init')

    document
      .querySelectorAll('[data-toggle="lightbox"],[data-gallery]')
      .forEach((el) => {
        const gallery = el.getAttribute('data-gallery')
        ui.collectGaleries(gallery)

        // click handler
        el.addEventListener('click', (e) => {
          e.preventDefault()
          console.log('MetaWindow: [link] click')

          const el = e.currentTarget
          ui.toggle(el)
        })
      })
  }

  constructor (
    state = {
      shown: false,
    },
    action
  ) {
    const ui = this

    ui.name = ui.constructor.name
    console.log(`${ui.name}: init`)

    ui.setState(state)
    switch (action) {
      case 'show':
        ui.hide()
        break
      case 'hide':
        ui.hide()
        break
    }

    W.dispatchEvent(new Event('{ui.name}.init'))
  }

  show = () => {
    const ui = this
    console.log(`${ui.name}: show`)

    ui.setState({
      shown: true,
    })

    W.dispatchEvent(new Event('{ui.name}.show'))
  }

  hide = () => {
    const ui = this

    console.log(`${ui.name}: hide`)
    ui.setState({
      shown: false,
    })
    W.dispatchEvent(new Event('{ui.name}.hide'))
  }

  next = () => {
    const ui = this
    const el = ui.state.current
    const gallery = el.getAttribute('data-gallery')

    let i = ui._currIndex()
    if (i < ui.state.collections[gallery].length - 1) {
      i++
    } else {
      i = 0
    }

    ui.state.collections[gallery][i].click()

    console.log(`${ui.name}: next`)
    W.dispatchEvent(new Event('{ui.name}.next'))
  }

  prev = () => {
    const ui = this
    const el = ui.state.current
    const gallery = el.getAttribute('data-gallery')

    let i = ui._currIndex()
    if (i > 0) {
      i--
    } else {
      i = ui.state.collections[gallery].length - 1
    }

    ui.state.collections[gallery][i].click()

    console.log(`${ui.name}: prev`)
    W.dispatchEvent(new Event('{ui.name}.prev'))
  }

  reset = () => {
    const ui = this

    ui.setState({
      content: '',
      type: ['empty'],
      shown: false,
      loading: false,
      error: false,
      embed: false,
      // collections: [],
      // current: null,
      // target: null,
    })
  }

  load = (link) => {
    const ui = this

    ui.reset()
    ui.setState({
      loading: true,
    })
    ui.show()

    window.fetch(link).then((resp) => {
      // handle success
      const type = resp.headers.get('content-type')
      console.log(resp)

      console.log(
        `${ui.name}: response content-type: ${type}`
      )
      const json = false

      switch (type) {
        case 'image/jpeg':
        case 'image/png':
        case 'image/svg+xml':
        case 'image/bmp':
        case 'image/gif':
        case 'image/tiff':
        case 'image/webp':
        case 'image/jpg':
        case 'image/svg':
          // json = JSON.parse(ui._abToString(resp.data));
          resp.arrayBuffer().then((buffer) => {
            ui.setContent(
              `<img src="data:${type};base64,${ui._imageEncode(buffer)}" />`,
              `meta-${ui.name}--image`
            )
          })
          break
        case 'application/json':
        case 'application/ld+json':
        case 'application/json; charset=UTF-8':
          ui.setContent(`${json.Content}`, [
            `meta-${ui.name}--text`,
            `meta-${ui.name}--html`,
            `meta-${ui.name}--json`,
          ])

          break
        case 'video/mp4':
          ui.setContent(`<video controls autoplay><source src="${link}" type="video/mp4">Your browser does not support the video tag.</video>`, [
            `meta-${ui.name}--image`,
            `meta-${ui.name}--video`,
          ])
          break
        case 'text/html':
        case 'application/xhtml+xml':
        case 'text/plain':
        case 'text/html; charset=UTF-8':
        case 'application/xhtml+xml; charset=UTF-8':
        case 'text/plain; charset=UTF-8':
          ui.setContent(resp.data, [
            `meta-${ui.name}--text`,
            `meta-${ui.name}--html`,
            `meta-${ui.name}--pajax`,
          ])
          break
        default:
          console.warn(`${ui.name}: Unknown response content-type!`)
          break
      }

      W.dispatchEvent(new Event('{ui.name}.loaded'))
    })
      .catch((error) => {
        console.error(error)

        let msg = ''

        if (error.response) {
          switch (error.response.status) {
            case 404:
              msg = 'Not Found.'
              break
            case 500:
              msg = 'Server issue, please try again latter.'
              break
            default:
              msg = 'Something went wrong.'
              break
          }
        } else if (error.request) {
          msg = 'No response received'
        } else {
          console.warn('Error', error.message)
        }

        ui.setState({
          error: msg,
        })

        W.dispatchEvent(new Event('{ui.name}.error'))
      })
      .then(() => {
        ui.setState({
          loading: false,
        })

        setTimeout(() => {
          ui.state.current.classList.remove('loading')
        }, 1000)
      })
  }

  _currIndex = () => {
    const ui = this
    const el = ui.state.current
    const gallery = el.getAttribute('data-gallery')

    return ui.state.collections[gallery].indexOf(el)
  }

  embed = (link) => {
    const ui = this
    console.log(`${ui.name}: embed`)

    ui.reset()
    ui.setState({
      embed: link,
      loading: false,
      type: [`meta-${ui.name}--embed`, `meta-${ui.name}--video`],
    })

    ui.show()
  }

  setCaption = (title) => {
    const ui = this
    console.log(`${ui.name}: setCaption`)

    ui.state.caption = title
  }

  addExtraClass = (cls) => {
    const ui = this

    if (!cls || !cls.length) {
      return
    }

    console.log(`${ui.name}: addExtraClass(${cls})`)
    ui.state.extraClass = cls
  }

  getCaption = () => {
    const ui = this
    return ui.state.caption
  }

  /* _abToString = (arrayBuffer) => {
    return String.fromCharCode.apply(null, new Uint8Array(arrayBuffer));
  }; */

  _imageEncode = (buffer) => {
    let binary = ''
    const bytes = [].slice.call(new Uint8Array(buffer))
    bytes.forEach((b) => {
      binary += String.fromCharCode(b)
    })
    return window.btoa(binary)
  }

  setContent = (html, type) => {
    const ui = this
    console.log(`${ui.name}: setContent`)

    let typeArr = type || [`meta-${ui.name}--html`, `meta-${ui.name}--text`]
    if (!Array.isArray(typeArr)) {
      typeArr = type.split(' ')
    }

    ui.setState({
      content: html,
      type: typeArr,
    })
  }

  getHtml = () => {
    const ui = this

    if (ui.state.embed) {
      const youtubeEmbed = require('youtube-embed')
      const embedLink = youtubeEmbed(ui.state.embed)
      ui.state.content = `<iframe width="600" height="380" src="${embedLink}" frameborder="0"></iframe>`
    }

    return ui.state.content
  }

  setState (state) {
    const ui = this
    ui.state = Object.assign({}, ui.state, state)
    ui.render()
  }

  render () {
    const ui = this
    const name = ui.name
    const el = ui.state.current

    ui.state.target.innerHTML = ''
    const meta = document.createElement('div')
    meta.classList.add(`meta-${name}`)
    meta.classList.add(...ui.state.type)
    ui.state.target.append(meta)

    const metaOverlay = document.createElement('div')
    metaOverlay.classList.add(`meta-${name}-overlay`)
    if (ui.state.shown) {
      metaOverlay.classList.add(`meta-${name}-overlay--open`)
    }

    if (ui.state.loading) {
      metaOverlay.classList.add(`meta-${name}-overlay--loading`)
    }

    if (ui.state.error) {
      metaOverlay.classList.add(`meta-${name}-overlay--error`)
    }

    meta.append(metaOverlay)

    const metaContent = document.createElement('div')
    metaContent.classList.add('meta-content')
    metaOverlay.append(metaContent)

    const btnClose = document.createElement('button')
    btnClose.classList.add('meta-nav', 'meta-close', 'a')
    btnClose.innerHTML =
      '<i class="icon fa fas fa-times"></i>' +
      ' <span class="visually-hidden">Close</span>'
    btnClose.addEventListener('click', (e) => {
      e.preventDefault()
      ui.hide()
    })
    metaContent.append(btnClose)

    if (el) {
      const gallery = el.getAttribute('data-gallery')
      if (gallery && ui.state.collections[gallery].length > 1) {
        const navs = document.createElement('nav')
        navs.classList.add('meta-navs')

        const prevBtn = document.createElement('button')
        prevBtn.classList.add(
          'meta-nav',
          'meta-nav-arrow',
          'meta-nav-arrow__prev',
          'a'
        )
        prevBtn.innerHTML =
          '<i class="icon fa fas fa-chevron-left"></i>' +
          ' <span class="visually-hidden">Previous</span>'
        prevBtn.addEventListener('click', (e) => {
          e.preventDefault()
          ui.prev()
        })
        navs.append(prevBtn)

        const nextBtn = document.createElement('button')
        nextBtn.classList.add(
          'meta-nav',
          'meta-nav-arrow',
          'meta-nav-arrow__next',
          'a'
        )
        nextBtn.innerHTML =
          '<i class="icon fa fas fa-chevron-right"></i>' +
          ' <span class="visually-hidden">Next</span>'
        nextBtn.addEventListener('click', (e) => {
          e.preventDefault()
          ui.next()
        })
        navs.append(nextBtn)

        metaContent.append(navs)
      }
    }

    const content = document.createElement('section')
    content.classList.add('meta-wrap', 'typography')
    if (ui.state.extraClass) {
      content.classList.add(ui.state.extraClass)
    }

    content.innerHTML = ui.getHtml()
    metaContent.append(content)

    if (ui.state.error) {
      const error = document.createElement('div')
      error.classList.add('meta-error')
      error.innerHTML = ui.state.error
      metaContent.append(error)
    } else if (ui.state.caption) {
      const caption = document.createElement('div')
      caption.classList.add('meta-caption')
      caption.innerHTML = ui.getCaption()
      metaContent.append(caption)
    }

    // update fontawesome dome
    if (typeof window.FontAwesome !== 'undefined') {
      window.FontAwesome.dom.i2svg()
    }

    return ui
  }
}

export default MetaWindow