/* global swal, axios, Dropzone, ClipboardJS, LazyLoad */

var page = {
  // user token
  token: localStorage.token,

  // configs from api/check
  private: null,
  enableUserAccounts: null,
  maxFileSize: null,
  chunkSize: null,

  // store album id that will be used with upload requests
  album: null,

  albumSelect: null,
  previewTemplate: null,

  dropzone: null,
  clipboardJS: null,
  lazyLoad: null
}

var imageExtensions = ['.webp', '.jpg', '.jpeg', '.bmp', '.gif', '.png']

page.checkIfPublic = function () {
  axios.get('api/check')
    .then(function (response) {
      page.private = response.data.private
      page.enableUserAccounts = response.data.enableUserAccounts
      page.maxFileSize = response.data.maxFileSize
      page.chunkSize = response.data.chunkSize
      page.preparePage()
    })
    .catch(function (error) {
      console.log(error)
      var button = document.getElementById('loginToUpload')
      button.classList.remove('is-loading')
      button.innerText = 'Error occurred. Reload the page?'
      return swal('An error occurred!', 'There was an error with the request, please check the console for more information.', 'error')
    })
}

page.preparePage = function () {
  if (page.private) {
    if (page.token) {
      return page.verifyToken(page.token, true)
    } else {
      var button = document.getElementById('loginToUpload')
      button.href = 'auth'
      button.classList.remove('is-loading')

      if (page.enableUserAccounts) {
        button.innerText = 'Anonymous upload is disabled. Log in to page.'
      } else {
        button.innerText = 'Running in private mode. Log in to page.'
      }
    }
  } else {
    return page.prepareUpload()
  }
}

page.verifyToken = function (token, reloadOnError) {
  if (reloadOnError === undefined) { reloadOnError = false }

  axios.post('api/tokens/verify', { token: token })
    .then(function (response) {
      if (response.data.success === false) {
        return swal({
          title: 'An error occurred!',
          text: response.data.description,
          icon: 'error'
        })
          .then(function () {
            if (!reloadOnError) { return }
            localStorage.removeItem('token')
            location.reload()
          })
      }

      localStorage.token = token
      page.token = token
      return page.prepareUpload()
    })
    .catch(function (error) {
      console.log(error)
      return swal('An error occurred!', 'There was an error with the request, please check the console for more information.', 'error')
    })
}

page.prepareUpload = function () {
  // I think this fits best here because we need to check for a valid token before we can get the albums
  if (page.token) {
    page.albumSelect = document.getElementById('albumSelect')

    page.albumSelect.addEventListener('change', function () {
      page.album = parseInt(page.albumSelect.value)
    })

    page.prepareAlbums()

    // Display the album selection
    document.getElementById('albumDiv').style.display = 'flex'
  }

  document.getElementById('maxFileSize').innerHTML = 'Maximum upload size per file is ' + page.maxFileSize
  document.getElementById('loginToUpload').style.display = 'none'

  if (!page.token && page.enableUserAccounts) {
    document.getElementById('loginLinkText').innerHTML = 'Create an account and keep track of your uploads'
  }

  var previewNode = document.querySelector('#tpl')
  page.previewTemplate = previewNode.innerHTML
  previewNode.parentNode.removeChild(previewNode)

  page.prepareDropzone()

  var tabs = document.getElementById('tabs')
  if (tabs) {
    tabs.style.display = 'flex'
    var items = tabs.getElementsByTagName('li')
    for (var i = 0; i < items.length; i++) {
      items[i].addEventListener('click', function () {
        page.setActiveTab(this.dataset.id)
      })
    }
    document.getElementById('uploadUrls').addEventListener('click', function () {
      page.uploadUrls(this)
    })
    page.setActiveTab('tab-files')
  } else {
    document.getElementById('tab-files').style.display = 'block'
  }
}

page.prepareAlbums = function () {
  var option = document.createElement('option')
  option.value = ''
  option.innerHTML = 'Upload to album'
  option.disabled = true
  option.selected = true
  page.albumSelect.appendChild(option)

  axios.get('api/albums', { headers: { token: page.token } })
    .then(function (response) {
      if (response.data.success === false) {
        return swal('An error occurred!', response.data.description, 'error')
      }

      // If the user doesn't have any albums we don't really need to display
      // an album selection
      if (!response.data.albums.length) { return }

      // Loop through the albums and create an option for each album
      for (var i = 0; i < response.data.albums.length; i++) {
        var album = response.data.albums[i]
        var option = document.createElement('option')
        option.value = album.id
        option.innerHTML = album.name
        page.albumSelect.appendChild(option)
      }
    })
    .catch(function (error) {
      console.log(error)
      return swal('An error occurred!', 'There was an error with the request, please check the console for more information.', 'error')
    })
}

page.setActiveTab = function (activeId) {
  var items = document.getElementById('tabs').getElementsByTagName('li')
  for (var i = 0; i < items.length; i++) {
    var tabId = items[i].dataset.id
    if (tabId === activeId) {
      items[i].classList.add('is-active')
      document.getElementById(tabId).style.display = 'block'
    } else {
      items[i].classList.remove('is-active')
      document.getElementById(tabId).style.display = 'none'
    }
  }
}

page.prepareDropzone = function () {
  var tabDiv = document.getElementById('tab-files')
  var div = document.createElement('div')
  div.className = 'control is-expanded'
  div.innerHTML =
    '<div id="dropzone" class="button is-danger is-fullwidth is-unselectable">\n' +
    '  <span class="icon">\n' +
    '    <i class="icon-upload-cloud"></i>\n' +
    '  </span>\n' +
    '  <span>Click here or drag and drop files</span>\n' +
    '</div>'

  tabDiv.getElementsByClassName('dz-container')[0].appendChild(div)

  var previewsContainer = tabDiv.getElementsByClassName('uploads')[0]
  page.dropzone = new Dropzone('#dropzone', {
    url: 'api/upload',
    paramName: 'files[]',
    maxFilesize: parseInt(page.maxFileSize),
    parallelUploads: 2,
    uploadMultiple: false,
    previewsContainer: previewsContainer,
    previewTemplate: page.previewTemplate,
    createImageThumbnails: false,
    maxFiles: 1000,
    autoProcessQueue: true,
    headers: { token: page.token },
    chunking: Boolean(page.chunkSize),
    chunkSize: parseInt(page.chunkSize) * 1000000, // 1000000 B = 1 MB,
    parallelChunkUploads: false, // when set to true, sometimes it often hangs with hundreds of parallel uploads
    chunksUploaded: function (file, done) {
      file.previewElement.querySelector('.progress').setAttribute('value', 100)
      file.previewElement.querySelector('.progress').innerHTML = '100%'

      // The API supports an array of multiple files
      return axios.post('api/upload/finishchunks',
        {
          files: [{
            uuid: file.upload.uuid,
            original: file.name,
            size: file.size,
            type: file.type,
            count: file.upload.totalChunkCount,
            albumid: page.album
          }]
        },
        {
          headers: {
            token: page.token
          }
        })
        .then(function (response) {
          file.previewElement.querySelector('.progress').style.display = 'none'

          if (response.data.success === false) {
            file.previewElement.querySelector('.error').innerHTML = response.data.description
          }

          if (response.data.files && response.data.files[0]) {
            page.updateTemplate(file, response.data.files[0])
          }
          return done()
        })
        .catch(function (error) {
          return {
            success: false,
            description: error.toString()
          }
        })
    }
  })

  page.dropzone.on('addedfile', function (file) {
    tabDiv.getElementsByClassName('uploads')[0].style.display = 'block'
    file.previewElement.querySelector('.name').innerHTML = file.name
  })

  // Add the selected albumid, if an album is selected, as a header
  page.dropzone.on('sending', function (file, xhr) {
    if (file.upload.chunked) { return }
    if (page.album) { xhr.setRequestHeader('albumid', page.album) }
  })

  // Update the total progress bar
  page.dropzone.on('uploadprogress', function (file, progress) {
    if (file.upload.chunked && progress === 100) { return }
    file.previewElement.querySelector('.progress').setAttribute('value', progress)
    file.previewElement.querySelector('.progress').innerHTML = progress + '%'
  })

  page.dropzone.on('success', function (file, response) {
    if (!response) { return }
    file.previewElement.querySelector('.progress').style.display = 'none'
    // file.previewElement.querySelector('.name').innerHTML = file.name

    if (response.success === false) {
      file.previewElement.querySelector('.error').innerHTML = response.description
    }

    if (response.files && response.files[0]) {
      page.updateTemplate(file, response.files[0])
    }
  })

  page.dropzone.on('error', function (file, error) {
    file.previewElement.querySelector('.progress').style.display = 'none'
    file.previewElement.querySelector('.name').innerHTML = file.name
    file.previewElement.querySelector('.error').innerHTML = error
  })

  if (typeof page.prepareShareX === 'function') { page.prepareShareX() }
}

page.uploadUrls = function (button) {
  var tabDiv = document.getElementById('tab-urls')
  if (!tabDiv) { return }

  if (button.classList.contains('is-loading')) { return }
  button.classList.add('is-loading')

  function done (error) {
    if (error) { swal('An error occurred!', error, 'error') }
    button.classList.remove('is-loading')
  }

  function run () {
    var albumid = page.album
    var previewsContainer = tabDiv.getElementsByClassName('uploads')[0]
    var urls = document.getElementById('urls').value
      .split(/\r?\n/)
      .filter(function (url) { return url.trim().length })
    document.getElementById('urls').value = urls.join('\n')

    if (!urls.length) {
      // eslint-disable-next-line prefer-promise-reject-errors
      return done('You have not entered any URLs.')
    }

    tabDiv.getElementsByClassName('uploads')[0].style.display = 'block'
    var files = urls.map(function (url) {
      var previewTemplate = document.createElement('template')
      previewTemplate.innerHTML = page.previewTemplate.trim()
      var previewElement = previewTemplate.content.firstChild
      previewElement.querySelector('.name').innerHTML = url
      previewsContainer.appendChild(previewElement)
      return {
        url: url,
        previewElement: previewElement
      }
    })

    function post (i) {
      if (i === files.length) { return done() }

      var file = files[i]

      function posted (result) {
        file.previewElement.querySelector('.progress').style.display = 'none'
        if (result.success) {
          page.updateTemplate(file, result.files[0])
        } else {
          file.previewElement.querySelector('.error').innerHTML = result.description
        }
        return post(i + 1)
      }

      axios.post('api/upload',
        {
          urls: [file.url]
        },
        {
          headers: {
            token: page.token,
            albumid: albumid
          }
        })
        .then(function (response) {
          return posted(response.data)
        })
        .catch(function (error) {
          return posted({
            success: false,
            description: error.toString()
          })
        })
    }
    return post(0)
  }
  return run()
}

page.updateTemplate = function (file, response) {
  if (!response.url) { return }

  var a = file.previewElement.querySelector('.link > a')
  var clipboard = file.previewElement.querySelector('.clipboard-mobile > .clipboard-js')
  a.href = a.innerHTML = clipboard.dataset['clipboardText'] = response.url
  clipboard.parentElement.style.display = 'block'

  var exec = /.[\w]+(\?|$)/.exec(response.url)
  if (exec && exec[0] && imageExtensions.includes(exec[0].toLowerCase())) {
    var img = file.previewElement.querySelector('img')
    img.setAttribute('alt', response.name || '')
    img.dataset['src'] = response.url
    img.onerror = function () { this.style.display = 'none' } // hide webp in firefox and ie
    page.lazyLoad.update(file.previewElement.querySelectorAll('img'))
  }
}

page.createAlbum = function () {
  var div = document.createElement('div')
  div.innerHTML =
    '<div class="field">\n' +
    '  <label class="label">Album name</label>\n' +
    '  <div class="controls">\n' +
    '    <input id="_name" class="input" type="text" placeholder="My super album">\n' +
    '  </div>\n' +
    '</div>\n' +
    '<div class="field">\n' +
    '  <div class="control">\n' +
    '    <label class="checkbox">\n' +
    '      <input id="_download" type="checkbox" checked>\n' +
    '      Enable download\n' +
    '    </label>\n' +
    '  </div>\n' +
    '</div>\n' +
    '<div class="field">\n' +
    '  <div class="control">\n' +
    '    <label class="checkbox">\n' +
    '      <input id="_public" type="checkbox" checked>\n' +
    '      Enable public link\n' +
    '    </label>\n' +
    '  </div>\n' +
    '</div>'

  swal({
    title: 'Create new album',
    icon: 'info',
    content: div,
    buttons: {
      cancel: true,
      confirm: {
        closeModal: false
      }
    }
  })
    .then(function (value) {
      if (!value) { return }

      var name = document.getElementById('_name').value
      axios.post('api/albums', {
        name: name,
        download: document.getElementById('_download').checked,
        public: document.getElementById('_public').checked
      }, { headers: { token: page.token } })
        .then(function (response) {
          if (response.data.success === false) {
            return swal('An error occurred!', response.data.description, 'error')
          }

          var option = document.createElement('option')
          option.value = response.data.id
          option.innerHTML = name
          page.albumSelect.appendChild(option)

          swal('Woohoo!', 'Album was created successfully', 'success')
        })
        .catch(function (error) {
          console.log(error)
          return swal('An error occurred!', 'There was an error with the request, please check the console for more information.', 'error')
        })
    })
}

// Handle image paste event
window.addEventListener('paste', function (event) {
  var items = (event.clipboardData || event.originalEvent.clipboardData).items
  for (var index in items) {
    var item = items[index]
    if (item.kind === 'file') {
      var blob = item.getAsFile()
      var file = new File([blob], 'pasted-image.' + blob.type.match(/(?:[^/]*\/)([^;]*)/)[1])
      file.type = blob.type
      page.dropzone.addFile(file)
    }
  }
})

window.onload = function () {
  page.checkIfPublic()

  page.clipboardJS = new ClipboardJS('.clipboard-js')

  page.clipboardJS.on('success', function () {
    return swal('Copied!', 'The link has been copied to clipboard.', 'success')
  })

  page.clipboardJS.on('error', function (event) {
    console.error(event)
    return swal('An error occurred!', 'There was an error when trying to copy the link to clipboard, please check the console for more information.', 'error')
  })

  page.lazyLoad = new LazyLoad()

  document.getElementById('createAlbum').addEventListener('click', function () {
    page.createAlbum()
  })
}