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+import React from 'react';
+import ImmutablePropTypes from 'react-immutable-proptypes';
+import PropTypes from 'prop-types';
+import ImmutablePureComponent from 'react-immutable-pure-component';
+import { connect } from 'react-redux';
+import classNames from 'classnames';
+import { changeUploadCompose, uploadThumbnail, onChangeMediaDescription, onChangeMediaFocus } from 'flavours/glitch/actions/compose';
+import Video, { getPointerPosition } from 'flavours/glitch/features/video';
+import { FormattedMessage, defineMessages, injectIntl } from 'react-intl';
+import IconButton from 'flavours/glitch/components/icon_button';
+import Button from 'flavours/glitch/components/button';
+import Audio from 'flavours/glitch/features/audio';
+import Textarea from 'react-textarea-autosize';
+import UploadProgress from 'flavours/glitch/features/compose/components/upload_progress';
+import CharacterCounter from 'flavours/glitch/features/compose/components/character_counter';
+import { length } from 'stringz';
+import { Tesseract as fetchTesseract } from 'flavours/glitch/features/ui/util/async-components';
+import GIFV from 'flavours/glitch/components/gifv';
+import { me } from 'flavours/glitch/initial_state';
+// eslint-disable-next-line import/no-extraneous-dependencies
+import tesseractCorePath from 'tesseract.js-core/tesseract-core.wasm.js';
+// eslint-disable-next-line import/extensions
+import tesseractWorkerPath from 'tesseract.js/dist/worker.min.js';
+import { assetHost } from 'flavours/glitch/utils/config';
+
+const messages = defineMessages({
+  close: { id: 'lightbox.close', defaultMessage: 'Close' },
+  apply: { id: 'upload_modal.apply', defaultMessage: 'Apply' },
+  applying: { id: 'upload_modal.applying', defaultMessage: 'Applying…' },
+  placeholder: { id: 'upload_modal.description_placeholder', defaultMessage: 'A quick brown fox jumps over the lazy dog' },
+  chooseImage: { id: 'upload_modal.choose_image', defaultMessage: 'Choose image' },
+  discardMessage: { id: 'confirmations.discard_edit_media.message', defaultMessage: 'You have unsaved changes to the media description or preview, discard them anyway?' },
+  discardConfirm: { id: 'confirmations.discard_edit_media.confirm', defaultMessage: 'Discard' },
+});
+
+const mapStateToProps = (state, { id }) => ({
+  media: state.getIn(['compose', 'media_attachments']).find(item => item.get('id') === id),
+  account: state.getIn(['accounts', me]),
+  isUploadingThumbnail: state.getIn(['compose', 'isUploadingThumbnail']),
+  description: state.getIn(['compose', 'media_modal', 'description']),
+  lang: state.getIn(['compose', 'language']),
+  focusX: state.getIn(['compose', 'media_modal', 'focusX']),
+  focusY: state.getIn(['compose', 'media_modal', 'focusY']),
+  dirty: state.getIn(['compose', 'media_modal', 'dirty']),
+  is_changing_upload: state.getIn(['compose', 'is_changing_upload']),
+});
+
+const mapDispatchToProps = (dispatch, { id }) => ({
+
+  onSave: (description, x, y) => {
+    dispatch(changeUploadCompose(id, { description, focus: `${x.toFixed(2)},${y.toFixed(2)}` }));
+  },
+
+  onChangeDescription: (description) => {
+    dispatch(onChangeMediaDescription(description));
+  },
+
+  onChangeFocus: (focusX, focusY) => {
+    dispatch(onChangeMediaFocus(focusX, focusY));
+  },
+
+  onSelectThumbnail: files => {
+    dispatch(uploadThumbnail(id, files[0]));
+  },
+
+});
+
+const removeExtraLineBreaks = str => str.replace(/\n\n/g, '******')
+  .replace(/\n/g, ' ')
+  .replace(/\*\*\*\*\*\*/g, '\n\n');
+
+class ImageLoader extends React.PureComponent {
+
+  static propTypes = {
+    src: PropTypes.string.isRequired,
+    width: PropTypes.number,
+    height: PropTypes.number,
+  };
+
+  state = {
+    loading: true,
+  };
+
+  componentDidMount() {
+    const image = new Image();
+    image.addEventListener('load', () => this.setState({ loading: false }));
+    image.src = this.props.src;
+  }
+
+  render () {
+    const { loading } = this.state;
+
+    if (loading) {
+      return <canvas width={this.props.width} height={this.props.height} />;
+    } else {
+      return <img {...this.props} alt='' />;
+    }
+  }
+
+}
+
+class FocalPointModal extends ImmutablePureComponent {
+
+  static propTypes = {
+    media: ImmutablePropTypes.map.isRequired,
+    account: ImmutablePropTypes.map.isRequired,
+    isUploadingThumbnail: PropTypes.bool,
+    onSave: PropTypes.func.isRequired,
+    onChangeDescription: PropTypes.func.isRequired,
+    onChangeFocus: PropTypes.func.isRequired,
+    onSelectThumbnail: PropTypes.func.isRequired,
+    onClose: PropTypes.func.isRequired,
+    intl: PropTypes.object.isRequired,
+  };
+
+  state = {
+    dragging: false,
+    dirty: false,
+    progress: 0,
+    loading: true,
+    ocrStatus: '',
+  };
+
+  componentWillUnmount () {
+    document.removeEventListener('mousemove', this.handleMouseMove);
+    document.removeEventListener('mouseup', this.handleMouseUp);
+  }
+
+  handleMouseDown = e => {
+    document.addEventListener('mousemove', this.handleMouseMove);
+    document.addEventListener('mouseup', this.handleMouseUp);
+
+    this.updatePosition(e);
+    this.setState({ dragging: true });
+  };
+
+  handleTouchStart = e => {
+    document.addEventListener('touchmove', this.handleMouseMove);
+    document.addEventListener('touchend', this.handleTouchEnd);
+
+    this.updatePosition(e);
+    this.setState({ dragging: true });
+  };
+
+  handleMouseMove = e => {
+    this.updatePosition(e);
+  };
+
+  handleMouseUp = () => {
+    document.removeEventListener('mousemove', this.handleMouseMove);
+    document.removeEventListener('mouseup', this.handleMouseUp);
+
+    this.setState({ dragging: false });
+  };
+
+  handleTouchEnd = () => {
+    document.removeEventListener('touchmove', this.handleMouseMove);
+    document.removeEventListener('touchend', this.handleTouchEnd);
+
+    this.setState({ dragging: false });
+  };
+
+  updatePosition = e => {
+    const { x, y } = getPointerPosition(this.node, e);
+    const focusX   = (x - .5) *  2;
+    const focusY   = (y - .5) * -2;
+
+    this.props.onChangeFocus(focusX, focusY);
+  };
+
+  handleChange = e => {
+    this.props.onChangeDescription(e.target.value);
+  };
+
+  handleKeyDown = (e) => {
+    if (e.keyCode === 13 && (e.ctrlKey || e.metaKey)) {
+      e.preventDefault();
+      e.stopPropagation();
+      this.props.onChangeDescription(e.target.value);
+      this.handleSubmit();
+    }
+  };
+
+  handleSubmit = () => {
+    this.props.onSave(this.props.description, this.props.focusX, this.props.focusY);
+  };
+
+  getCloseConfirmationMessage = () => {
+    const { intl, dirty } = this.props;
+
+    if (dirty) {
+      return {
+        message: intl.formatMessage(messages.discardMessage),
+        confirm: intl.formatMessage(messages.discardConfirm),
+      };
+    } else {
+      return null;
+    }
+  };
+
+  setRef = c => {
+    this.node = c;
+  };
+
+  handleTextDetection = () => {
+    this._detectText();
+  };
+
+  _detectText = (refreshCache = false) => {
+    const { media } = this.props;
+
+    this.setState({ detecting: true });
+
+    fetchTesseract().then(({ createWorker }) => {
+      const worker = createWorker({
+        workerPath: tesseractWorkerPath,
+        corePath: tesseractCorePath,
+        langPath: `${assetHost}/ocr/lang-data/`,
+        logger: ({ status, progress }) => {
+          if (status === 'recognizing text') {
+            this.setState({ ocrStatus: 'detecting', progress });
+          } else {
+            this.setState({ ocrStatus: 'preparing', progress });
+          }
+        },
+        cacheMethod: refreshCache ? 'refresh' : 'write',
+      });
+
+      let media_url = media.get('url');
+
+      if (window.URL && URL.createObjectURL) {
+        try {
+          media_url = URL.createObjectURL(media.get('file'));
+        } catch (error) {
+          console.error(error);
+        }
+      }
+
+      return (async () => {
+        await worker.load();
+        await worker.loadLanguage('eng');
+        await worker.initialize('eng');
+        const { data: { text } } = await worker.recognize(media_url);
+        this.setState({ detecting: false });
+        this.props.onChangeDescription(removeExtraLineBreaks(text));
+        await worker.terminate();
+      })().catch((e) => {
+        if (refreshCache) {
+          throw e;
+        } else {
+          this._detectText(true);
+        }
+      });
+    }).catch((e) => {
+      console.error(e);
+      this.setState({ detecting: false });
+    });
+  };
+
+  handleThumbnailChange = e => {
+    if (e.target.files.length > 0) {
+      this.props.onSelectThumbnail(e.target.files);
+    }
+  };
+
+  setFileInputRef = c => {
+    this.fileInput = c;
+  };
+
+  handleFileInputClick = () => {
+    this.fileInput.click();
+  };
+
+  render () {
+    const { media, intl, account, onClose, isUploadingThumbnail, description, lang, focusX, focusY, dirty, is_changing_upload } = this.props;
+    const { dragging, detecting, progress, ocrStatus } = this.state;
+    const x = (focusX /  2) + .5;
+    const y = (focusY / -2) + .5;
+
+    const width  = media.getIn(['meta', 'original', 'width']) || null;
+    const height = media.getIn(['meta', 'original', 'height']) || null;
+    const focals = ['image', 'gifv'].includes(media.get('type'));
+    const thumbnailable = ['audio', 'video'].includes(media.get('type'));
+
+    const previewRatio  = 16/9;
+    const previewWidth  = 200;
+    const previewHeight = previewWidth / previewRatio;
+
+    let descriptionLabel = null;
+
+    if (media.get('type') === 'audio') {
+      descriptionLabel = <FormattedMessage id='upload_form.audio_description' defaultMessage='Describe for people who are hard of hearing' />;
+    } else if (media.get('type') === 'video') {
+      descriptionLabel = <FormattedMessage id='upload_form.video_description' defaultMessage='Describe for people who are deaf, hard of hearing, blind or have low vision' />;
+    } else {
+      descriptionLabel = <FormattedMessage id='upload_form.description' defaultMessage='Describe for people who are blind or have low vision' />;
+    }
+
+    let ocrMessage = '';
+    if (ocrStatus === 'detecting') {
+      ocrMessage = <FormattedMessage id='upload_modal.analyzing_picture' defaultMessage='Analyzing picture…' />;
+    } else {
+      ocrMessage = <FormattedMessage id='upload_modal.preparing_ocr' defaultMessage='Preparing OCR…' />;
+    }
+
+    return (
+      <div className='modal-root__modal report-modal' style={{ maxWidth: 960 }}>
+        <div className='report-modal__target'>
+          <IconButton className='report-modal__close' title={intl.formatMessage(messages.close)} icon='times' onClick={onClose} size={20} />
+          <FormattedMessage id='upload_modal.edit_media' defaultMessage='Edit media' />
+        </div>
+
+        <div className='report-modal__container'>
+          <div className='report-modal__comment'>
+            {focals && <p><FormattedMessage id='upload_modal.hint' defaultMessage='Click or drag the circle on the preview to choose the focal point which will always be in view on all thumbnails.' /></p>}
+
+            {thumbnailable && (
+              <React.Fragment>
+                <label className='setting-text-label' htmlFor='upload-modal__thumbnail'><FormattedMessage id='upload_form.thumbnail' defaultMessage='Change thumbnail' /></label>
+
+                <Button disabled={isUploadingThumbnail || !media.get('unattached')} text={intl.formatMessage(messages.chooseImage)} onClick={this.handleFileInputClick} />
+
+                <label>
+                  <span style={{ display: 'none' }}>{intl.formatMessage(messages.chooseImage)}</span>
+
+                  <input
+                    id='upload-modal__thumbnail'
+                    ref={this.setFileInputRef}
+                    type='file'
+                    accept='image/png,image/jpeg'
+                    onChange={this.handleThumbnailChange}
+                    style={{ display: 'none' }}
+                    disabled={isUploadingThumbnail || is_changing_upload}
+                  />
+                </label>
+
+                <hr className='setting-divider' />
+              </React.Fragment>
+            )}
+
+            <label className='setting-text-label' htmlFor='upload-modal__description'>
+              {descriptionLabel}
+            </label>
+
+            <div className='setting-text__wrapper'>
+              <Textarea
+                id='upload-modal__description'
+                className='setting-text light'
+                value={detecting ? '…' : description}
+                lang={lang}
+                onChange={this.handleChange}
+                onKeyDown={this.handleKeyDown}
+                disabled={detecting || is_changing_upload}
+                autoFocus
+              />
+
+              <div className='setting-text__modifiers'>
+                <UploadProgress progress={progress * 100} active={detecting} icon='file-text-o' message={ocrMessage} />
+              </div>
+            </div>
+
+            <div className='setting-text__toolbar'>
+              <button disabled={detecting || media.get('type') !== 'image' || is_changing_upload} className='link-button' onClick={this.handleTextDetection}><FormattedMessage id='upload_modal.detect_text' defaultMessage='Detect text from picture' /></button>
+              <CharacterCounter max={1500} text={detecting ? '' : description} />
+            </div>
+
+            <Button disabled={!dirty || detecting || isUploadingThumbnail || length(description) > 1500 || is_changing_upload} text={intl.formatMessage(is_changing_upload ? messages.applying : messages.apply)} onClick={this.handleSubmit} />
+          </div>
+
+          <div className='focal-point-modal__content'>
+            {focals && (
+              <div className={classNames('focal-point', { dragging })} ref={this.setRef} onMouseDown={this.handleMouseDown} onTouchStart={this.handleTouchStart}>
+                {media.get('type') === 'image' && <ImageLoader src={media.get('url')} width={width} height={height} alt='' />}
+                {media.get('type') === 'gifv' && <GIFV src={media.get('url')} width={width} height={height} />}
+
+                <div className='focal-point__preview'>
+                  <strong><FormattedMessage id='upload_modal.preview_label' defaultMessage='Preview ({ratio})' values={{ ratio: '16:9' }} /></strong>
+                  <div style={{ width: previewWidth, height: previewHeight, backgroundImage: `url(${media.get('preview_url')})`, backgroundSize: 'cover', backgroundPosition: `${x * 100}% ${y * 100}%` }} />
+                </div>
+
+                <div className='focal-point__reticle' style={{ top: `${y * 100}%`, left: `${x * 100}%` }} />
+                <div className='focal-point__overlay' />
+              </div>
+            )}
+
+            {media.get('type') === 'video' && (
+              <Video
+                preview={media.get('preview_url')}
+                frameRate={media.getIn(['meta', 'original', 'frame_rate'])}
+                blurhash={media.get('blurhash')}
+                src={media.get('url')}
+                detailed
+                inline
+                editable
+              />
+            )}
+
+            {media.get('type') === 'audio' && (
+              <Audio
+                src={media.get('url')}
+                duration={media.getIn(['meta', 'original', 'duration'], 0)}
+                height={150}
+                poster={media.get('preview_url') || account.get('avatar_static')}
+                backgroundColor={media.getIn(['meta', 'colors', 'background'])}
+                foregroundColor={media.getIn(['meta', 'colors', 'foreground'])}
+                accentColor={media.getIn(['meta', 'colors', 'accent'])}
+                editable
+              />
+            )}
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+}
+
+export default connect(mapStateToProps, mapDispatchToProps, null, {
+  forwardRef: true,
+})(injectIntl(FocalPointModal, { withRef: true }));