var Clipboard = require('clipboard/dist/clipboard.min.js') // FIXME: workaround for browserify

var VueClipboardConfig = {
  autoSetContainer: false,
  appendToBody: true // This fixes IE, see #50
}

var VueClipboard = {
  install: function (Vue) {
    var globalPrototype = Vue.version.slice(0, 2) === '3.' ? Vue.config.globalProperties : Vue.prototype
    globalPrototype.$clipboardConfig = VueClipboardConfig
    globalPrototype.$copyText = function (text, container) {
      return new Promise(function (resolve, reject) {
        var fakeElement = document.createElement('button')
        var clipboard = new Clipboard(fakeElement, {
          text: function () { return text },
          action: function () { return 'copy' },
          container: typeof container === 'object' ? container : document.body
        })
        clipboard.on('success', function (e) {
          clipboard.destroy()
          resolve(e)
        })
        clipboard.on('error', function (e) {
          clipboard.destroy()
          reject(e)
        })
        if (VueClipboardConfig.appendToBody) document.body.appendChild(fakeElement)
        fakeElement.click()
        if (VueClipboardConfig.appendToBody) document.body.removeChild(fakeElement)
      })
    }

    Vue.directive('clipboard', {
      bind: function (el, binding, vnode) {
        if (binding.arg === 'success') {
          el._vClipboard_success = binding.value
        } else if (binding.arg === 'error') {
          el._vClipboard_error = binding.value
        } else {
          var clipboard = new Clipboard(el, {
            text: function () { return binding.value },
            action: function () { return binding.arg === 'cut' ? 'cut' : 'copy' },
            container: VueClipboardConfig.autoSetContainer ? el : undefined
          })
          clipboard.on('success', function (e) {
            var callback = el._vClipboard_success
            callback && callback(e)
          })
          clipboard.on('error', function (e) {
            var callback = el._vClipboard_error
            callback && callback(e)
          })
          el._vClipboard = clipboard
        }
      },
      update: function (el, binding) {
        if (binding.arg === 'success') {
          el._vClipboard_success = binding.value
        } else if (binding.arg === 'error') {
          el._vClipboard_error = binding.value
        } else {
          el._vClipboard.text = function () { return binding.value }
          el._vClipboard.action = function () { return binding.arg === 'cut' ? 'cut' : 'copy' }
        }
      },
      unbind: function (el, binding) {
        // FIXME: investigate why $element._vClipboard was missing
        if (!el._vClipboard) return
        if (binding.arg === 'success') {
          delete el._vClipboard_success
        } else if (binding.arg === 'error') {
          delete el._vClipboard_error
        } else {
          el._vClipboard.destroy()
          delete el._vClipboard
        }
      }
    })
  },
  config: VueClipboardConfig
}

if (typeof exports === 'object') {
  module.exports = VueClipboard
} else if (typeof define === 'function' && define.amd) {
  define([], function () {
    return VueClipboard
  })
}