/* jshint browser:true, jquery:true */
$(function () {
  var uploadInput = $('#upload-input')
    , uploadBtn = $('#upload-btn')
    , uploadFiles = $('#upload-filelist')

  var btnContent = ""

  if (!$.hasFileAPI()) {
    $('#no-file-api').show()
    uploadBtn.hide()
  }

  uploadBtn.cabinet(uploadInput)

  uploadBtn.on('dragenter', function (e) {
    if (this === e.target) {
      $(this).addClass('drop')
      btnContent = $(this).html()
      $(this).html('Drop it here~')
    }
  })

  uploadBtn.on('drop', function (e) {
    $(this).trigger('dragleave')
  })

  uploadBtn.on('dragleave', function (e) {
    node = e.target
    do {
      if (node === this) {
        $(this).removeClass('drop')
        $(this).html(btnContent)
        break
      }
    } while (node = node.parentNode)
  })

  var MAX_SIZE = (function (node) {
    var max = node.attr('data-max-size') || '120MiB'
    var num = parseInt(/([0-9,]+).*/.exec(max)[1].replace(',', ''))
    var unit = /(?:([KMGTPEZY])(i)?B|([BKMGTPEZY]))/.exec(max) || ["B","",""]

    var oneUnit = Math.pow(
      (unit[2] === "i" ? 1024 : 1000),
      'BKMGTPEZY'.indexOf(unit[1])
    )

    return num * oneUnit
  })(uploadInput)

  var createRow = function (filename, size, extra) {
    var rowItem = $('<li class=file>')
      , rowName = $('<span class=file-name>')
      , rowProg = $('<div class="file-progress progress-outer">')
      , rowSize = $('<span class=file-size>')
      , rowUrl  = $('<span class=file-url>')

    rowItem.addClass(extra || '')

    $('<div class=progress-inner>').appendTo(rowProg)

    rowItem.attr('data-filename', escape(filename))
    rowName.text(filename)
    rowSize.text(size)

    rowItem.append(rowName, rowProg, rowSize, rowUrl)

    return rowItem
  }

  uploadBtn.on('change', function (e) {
    uploadFiles.empty().removeClass('error completed')

    var files = uploadInput[0].filelist;

    files.forEach(function (file) {
      createRow(file.name, file.humanSize).appendTo(uploadFiles)
    })

    var totalRow = createRow('', files.humanSize, 'total')
    totalRow.appendTo(uploadFiles)

    if (files.size > MAX_SIZE) {
      uploadFiles.addClass('error')

      $('.file-name', totalRow).html('onii-chan y-your upload is t-too big&hellip;');
      return
    }

    var up = files.upload("upload.php")

    var eachRow = function (files, fn) {
      var hits = {}
      files.forEach(function (file) {
        ++hits[file.name] || (hits[file.name] = 0)
        var row = $($('li[data-filename="' + escape(file.name) + '"]')[hits[file.name] || 0])
        fn.call(row, row, file, files)
      })
    }

    var totalName = $('.file-name', totalRow)

    up.on('uploadprogress', function (e, files) {
      eachRow(files, function (row, file, files) {
        $('.progress-inner', row).width((file.percentUploaded * 100) + '%')
      })
      $('.progress-inner', totalRow).width((files.percentUploaded * 100) + '%')
    })

    up.on('uploadcomplete', function (e) {
      $('.progress-inner').width('100%')
      totalName.text('Grabbing URLs...')
    })

    up.on('load', function (e, res) {
      switch (e.target.status) {
        case 200:
          var res = JSON.parse(res)
          if (!res.success) {
            uploadFiles.addClass('error')
            $('.file-name', totalRow).text('Something went wrong; try again later.')
            break
          }
          eachRow(res.files, function (row, file, files) {
            var link = $('<a>')

              link.attr('href', file.url)
              .attr('target', '_BLANK')
              .text(file.url.replace("http://","").replace("https://",""))

            $('.file-url', row).append(link)
          })
          uploadFiles.addClass('completed')
          totalName.text('Done!')
          break
        case 413:
          uploadFiles.addClass('error completed')
          // Terrible work-around, but necessary since otherwise the '&hellip;' entity is left decoded
          totalName.html($('<div/>').html('onii-chan, y-your upload is t-too big&hellip;').text());
          break
        default:
          uploadFiles.addClass('error completed')
          totalName.text('Something went wrong; try again later.')
      }
    })
    up.upload()
  })
})