import { h, Fragment } from 'preact';
import { useState } from 'preact/hooks';
import PropTypes from 'prop-types';
import { addSnackbarItem } from '../../Snackbar';
import { generateMainImage } from '../actions';
import { validateFileInputs } from '../../packs/validateFileInputs';
import { onDragOver, onDragExit } from './dragAndDropHelpers';
import { Button } from '@crayons';
import { Spinner } from '@crayons/Spinner/Spinner';
import { DragAndDropZone } from '@utilities/dragAndDrop';
import { isNativeIOS } from '@utilities/runtime';

const NativeIosImageUpload = ({
  extraProps,
  uploadLabel,
  isUploadingImage,
}) => (
  <Fragment>
    {isUploadingImage ? null : (
      <Button
        variant="outlined"
        className="mr-2 whitespace-nowrap"
        {...extraProps}
      >
        {uploadLabel}
      </Button>
    )}
  </Fragment>
);

const StandardImageUpload = ({
  uploadLabel,
  handleImageUpload,
  isUploadingImage,
}) =>
  isUploadingImage ? null : (
    <Fragment>
      <label className="cursor-pointer crayons-btn crayons-btn--outlined crayons-tooltip__activator">
        {uploadLabel}
        <input
          data-testid="cover-image-input"
          id="cover-image-input"
          type="file"
          onChange={handleImageUpload}
          accept="image/*"
          className="screen-reader-only"
          data-max-file-size-mb="25"
        />
        <span data-testid="tooltip" className="crayons-tooltip__content">
          Use a ratio of 100:42 for best results.
        </span>
      </label>
    </Fragment>
  );

export const ArticleCoverImage = ({ onMainImageUrlChange, mainImage }) => {
  const [uploadError, setUploadError] = useState(false);
  const [uploadErrorMessage, setUploadErrorMessage] = useState(null);
  const [uploadingImage, setUploadingImage] = useState(false);

  const onImageUploadSuccess = (...args) => {
    onMainImageUrlChange(...args);
    setUploadingImage(false);
  };

  const handleMainImageUpload = (event) => {
    event.preventDefault();

    setUploadingImage(true);
    clearUploadError();

    if (validateFileInputs()) {
      const { files: image } = event.dataTransfer || event.target;
      const payload = { image };

      generateMainImage({
        payload,
        successCb: onImageUploadSuccess,
        failureCb: onUploadError,
      });
    } else {
      setUploadingImage(false);
    }
  };

  const clearUploadError = () => {
    setUploadError(false);
    setUploadErrorMessage(null);
  };

  const onUploadError = (error) => {
    setUploadingImage(false);
    setUploadError(true);
    setUploadErrorMessage(error.message);
  };

  const useNativeUpload = () => {
    return isNativeIOS('imageUpload');
  };

  const initNativeImagePicker = (e) => {
    e.preventDefault();
    window.ForemMobile?.injectNativeMessage('coverUpload', {
      action: 'coverImageUpload',
      ratio: `${100.0 / 42.0}`,
    });
  };

  const handleNativeMessage = (e) => {
    const message = JSON.parse(e.detail);
    if (message.namespace !== 'coverUpload') {
      return;
    }

    /* eslint-disable no-case-declarations */
    switch (message.action) {
      case 'uploading':
        setUploadingImage(true);
        clearUploadError();
        break;
      case 'error':
        setUploadingImage(false);
        setUploadError(true);
        setUploadErrorMessage(message.error);
        break;
      case 'success':
        onMainImageUrlChange({
          links: [message.link],
        });
        setUploadingImage(false);
        break;
    }
    /* eslint-enable no-case-declarations */
  };

  const triggerMainImageRemoval = (e) => {
    e.preventDefault();
    onMainImageUrlChange({
      links: [null],
    });
  };

  const onDropImage = (event) => {
    onDragExit(event);

    if (event.dataTransfer.files.length > 1) {
      addSnackbarItem({
        message: 'Only one image can be dropped at a time.',
        addCloseButton: true,
      });
      return;
    }

    handleMainImageUpload(event);
  };

  const uploadLabel = mainImage ? 'Change' : 'Add a cover image';

  // When the component is rendered in an environment that supports a native
  // image picker for image upload we want to add the aria-label attr and the
  // onClick event to the UI button. This event will kick off the native UX.
  // The props are unwrapped (using spread operator) in the button below
  const extraProps = useNativeUpload()
    ? {
        onClick: initNativeImagePicker,
        'aria-label': 'Upload cover image',
      }
    : {};

  // Native Bridge messages come through ForemMobile events
  document.addEventListener('ForemMobile', handleNativeMessage);

  return (
    <DragAndDropZone
      onDragOver={onDragOver}
      onDragExit={onDragExit}
      onDrop={onDropImage}
    >
      <div className="crayons-article-form__cover" role="presentation">
        {!uploadingImage && mainImage && (
          <img
            src={mainImage}
            className="crayons-article-form__cover__image"
            width="250"
            height="105"
            alt="Post cover"
          />
        )}
        <div className="flex items-center">
          {uploadingImage && (
            <span class="lh-base pl-1 border-0 py-2 inline-block">
              <Spinner /> Uploading...
            </span>
          )}

          <Fragment>
            {useNativeUpload() ? (
              <NativeIosImageUpload
                isUploadingImage={uploadingImage}
                extraProps={extraProps}
                uploadLabel={uploadLabel}
              />
            ) : (
              <StandardImageUpload
                isUploadingImage={uploadingImage}
                uploadLabel={uploadLabel}
                handleImageUpload={handleMainImageUpload}
              />
            )}

            {mainImage && !uploadingImage && (
              <Button variant="ghost-danger" onClick={triggerMainImageRemoval}>
                Remove
              </Button>
            )}
          </Fragment>
        </div>
        {uploadError && (
          <p className="articleform__uploaderror">{uploadErrorMessage}</p>
        )}
      </div>
    </DragAndDropZone>
  );
};

ArticleCoverImage.propTypes = {
  mainImage: PropTypes.string,
  onMainImageUrlChange: PropTypes.func.isRequired,
};

ArticleCoverImage.displayName = 'ArticleCoverImage';