import React from 'react'
import PropTypes from 'prop-types'
import LoadingModal from './LoadingModal'
import Modal from './Modal'
import Button from '../Button'
import FileReaderInput from 'react-file-reader-input'
import request from 'request'

import FileUploadIcon from 'react-icons/lib/md/file-upload'
import AddIcon from 'react-icons/lib/md/add-circle-outline'

import style from '../../libs/style.js'
import publicStyles from '../../config/styles.json'

class PublicStyle extends React.Component {
  static propTypes = {
    url: PropTypes.string.isRequired,
    thumbnailUrl: PropTypes.string.isRequired,
    title: PropTypes.string.isRequired,
    onSelect: PropTypes.func.isRequired,
  }

  render() {
    return <div className="maputnik-public-style">
      <Button
        className="maputnik-public-style-button"
        aria-label={this.props.title}
        onClick={() => this.props.onSelect(this.props.url)}
      >
        <header className="maputnik-public-style-header">
          <h4>{this.props.title}</h4>
          <span className="maputnik-space" />
          <AddIcon />
        </header>
        <div
          className="maputnik-public-style-thumbnail"
          style={{
            backgroundImage: `url(${this.props.thumbnailUrl})`
          }}
        ></div>
      </Button>
    </div>
  }
}

class OpenModal extends React.Component {
  static propTypes = {
    isOpen: PropTypes.bool.isRequired,
    onOpenToggle: PropTypes.func.isRequired,
    onStyleOpen: PropTypes.func.isRequired,
  }

  constructor(props) {
    super(props);
    this.state = {};
  }

  clearError() {
    this.setState({
      error: null
    })
  }

  onCancelActiveRequest(e) {
    // Else the click propagates to the underlying modal
    if(e) e.stopPropagation();

    if(this.state.activeRequest) {
      this.state.activeRequest.abort();
      this.setState({
        activeRequest: null,
        activeRequestUrl: null
      });
    }
  }

  onStyleSelect(styleUrl) {
    this.clearError();

    const reqOpts = {
      url: styleUrl,
      withCredentials: false,
    }

    const activeRequest = request(reqOpts, (error, response, body) => {
      this.setState({
        activeRequest: null,
        activeRequestUrl: null
      });

        if (!error && response.statusCode == 200) {
          const mapStyle = style.ensureStyleValidity(JSON.parse(body))
          console.log('Loaded style ', mapStyle.id)
          this.props.onStyleOpen(mapStyle)
          this.onOpenToggle()
        } else {
          console.warn('Could not open the style URL', styleUrl)
        }
    })

    this.setState({
      activeRequest: activeRequest,
      activeRequestUrl: reqOpts.url
    })
  }

  onOpenUrl() {
    const url = this.styleUrlElement.value;
    this.onStyleSelect(url);
  }

  onUpload(_, files) {
    const [e, file] = files[0];
    const reader = new FileReader();

    this.clearError();

    reader.readAsText(file, "UTF-8");
    reader.onload = e => {
      let mapStyle;
      try {
        mapStyle = JSON.parse(e.target.result)
      }
      catch(err) {
        this.setState({
          error: err.toString()
        });
        return;
      }
      mapStyle = style.ensureStyleValidity(mapStyle)
      this.props.onStyleOpen(mapStyle);
      this.onOpenToggle();
    }
    reader.onerror = e => console.log(e.target);
  }

  onOpenToggle() {
    this.clearError();
    this.props.onOpenToggle();
  }

  render() {
    const styleOptions = publicStyles.map(style => {
      return <PublicStyle
        key={style.id}
        url={style.url}
        title={style.title}
        thumbnailUrl={style.thumbnail}
        onSelect={this.onStyleSelect.bind(this)}
      />
    })

    let errorElement;
    if(this.state.error) {
      errorElement = (
        <div className="maputnik-modal-error">
          {this.state.error}
          <a href="#" onClick={() => this.clearError()} className="maputnik-modal-error-close">×</a>
        </div>
      );
    }

    return <Modal
      data-wd-key="open-modal"
      isOpen={this.props.isOpen}
      onOpenToggle={() => this.onOpenToggle()}
      title={'Open Style'}
    >
      {errorElement}
      <section className="maputnik-modal-section">
        <h2>Upload Style</h2>
        <p>Upload a JSON style from your computer.</p>
        <FileReaderInput onChange={this.onUpload.bind(this)} tabIndex="-1">
          <Button className="maputnik-upload-button"><FileUploadIcon /> Upload</Button>
        </FileReaderInput>
      </section>

      <section className="maputnik-modal-section">
        <h2>Load from URL</h2>
        <p>
          Load from a URL. Note that the URL must have <a href="https://enable-cors.org" target="_blank" rel="noopener noreferrer">CORS enabled</a>.
        </p>
        <input data-wd-key="open-modal.url.input" type="text" ref={(input) => this.styleUrlElement = input} className="maputnik-input" placeholder="Enter URL..."/>
        <div>
          <Button data-wd-key="open-modal.url.button" className="maputnik-big-button" onClick={this.onOpenUrl.bind(this)}>Open URL</Button>
        </div>
      </section>

      <section className="maputnik-modal-section maputnik-modal-section--shrink">
        <h2>Gallery Styles</h2>
        <p>
          Open one of the publicly available styles to start from.
        </p>
        <div className="maputnik-style-gallery-container">
        {styleOptions}
        </div>
      </section>

      <LoadingModal
        isOpen={!!this.state.activeRequest}
        title={'Loading style'}
        onCancel={(e) => this.onCancelActiveRequest(e)}
        message={"Loading: "+this.state.activeRequestUrl}
      />
    </Modal>
  }
}

export default OpenModal