import React from 'react'
import PropTypes from 'prop-types'
import _ from 'lodash'
import * as filepicker from 'filestack-js/build/browser/filestack.min.js'

require('./FilePicker.scss')

class FilePicker extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      dragText: props.options.dragText,
      dropPaneId: _.uniqueId('filepicker-drag-drop-pane_')
    }
    this.onChange = this.onChange.bind(this)
  }

  onChange(event) {
    this.props.onSuccess(this.props.options.multiple ? event.fpfiles : event.fpfile)
  }

  componentWillReceiveProps(nextProps) {
    this.setState({dragText: nextProps.options.dragText})
  }

  componentDidMount() {

    const filepickerElement = this.refs.filepicker
    const filepickerProgress = this.refs.filepickerProgress

    const apikey = this.props.apiKey
    const clientOptions = {}
    if (this.props.options.cname) { clientOptions.cname = this.props.options.cname }
    const client = filepicker.init(apikey, clientOptions)

    const opts = {}
    opts.displayMode = 'dropPane'
    opts.container = this.state.dropPaneId
    opts.maxFiles = 4

    opts.storeTo = {}
    opts.storeTo.container = this.props.options.storeContainer
    opts.storeTo.region = 'us-east-1'

    opts.dropPane = {}
    opts.dropPane.customText = ' '
    opts.dropPane.overlay = false
    opts.dropPane.showIcon = false
    opts.dropPane.disableClick = true
    opts.dropPane.onDragEnter = () => {
      this.setState({dragText: 'Drop to upload'})
      filepickerElement.classList.add('drag-entered')
    }
    opts.dropPane.onDragLeave = () => {
      this.setState({dragText: this.props.options.dragText})
      filepickerElement.classList.remove('drag-entered')
    }
    opts.dropPane.onSuccess = (files) => {
      this.setState({dragText: this.props.options.dragText})
      filepickerElement.classList.remove('in-progress')
      this.props.onSuccess(this.props.options.multiple ? files : files[0])
    }
    opts.dropPane.onError = () => {
      filepickerElement.classList.remove('in-progress')
      this.setState({dragText: this.props.options.dragText})
    }
    opts.dropPane.onProgress = (percentage) => {
      filepickerElement.classList.remove('drag-entered')
      filepickerElement.classList.add('in-progress')
      filepickerProgress.style.width = percentage + '%'
    }
    opts.dropPane.onClick = () => {
      const overlayOpts = {}
      overlayOpts.maxFiles = opts.maxFiles
      overlayOpts.uploadInBackground = false
      overlayOpts.onFileUploadFinished = (files) => {
        this.props.onSuccess(this.props.options.multiple ? files : files[0])
      }
      overlayOpts.storeTo = opts.storeTo
      overlayOpts.fromSources = this.props.options.fromSources
      client.picker(overlayOpts).open()
    }

    client.picker(opts).open()

    filepickerElement.addEventListener('change', this.onChange, false)
  }

  componentWillUnmount() {
    if (this.refs.filepicker) {
      this.refs.filepicker.removeEventListener('change', this.onChange, false)
    }
  }

  render() {
    const {mode, options} = this.props
    const {dragText} = this.state

    // add data-fp- prefix to all keys
    const opts = _.mapKeys(options, (v, k) => {
      const hyphenated = k.replace(/([a-zA-Z])(?=[A-Z])/g, '$1-').toLowerCase()
      return `data-fp-${hyphenated}`
    })
    return (
      <div ref="filepicker" className="filepicker">
        <input type={mode} onChange={this.onChange} {...opts}/>
        <div className="filepicker-drag-drop-pane" id={this.state.dropPaneId} {...opts}>
          <span className="filepicker-drag-drop-text">{ dragText }</span>
          <button type="button" className="tc-btn tc-btn-secondary tc-btn-sm">Add File</button>
        </div>
        <div className="filepicker-progress" ref="filepickerProgress"></div>
      </div>
    )
  }
}

FilePicker.propTypes = {
  apiKey: PropTypes.string.isRequired,
  mode: PropTypes.string.isRequired,
  options: PropTypes.object.isRequired,
  onSuccess: PropTypes.func.isRequired
}

export default FilePicker