webapp/src/components/_shared/ImageCropper/ImageCropper.tsx

import { createSignal, Show } from 'solid-js'
import { createStore } from 'solid-js/store'
import Cropper from 'cropperjs'

import styles from './ImageCropper.module.scss'

export const ImageCropper = (props) => {
  let cropImage
  const [state, setState] = createStore({
      error: null,
      loading: false,
      file: {},
      croppedImage: null,
    }),
    [dropZoneActive, setDropZoneActive] = createSignal(false),
    [uploading, setUploading] = createSignal(false),
    [preview, setPreview] = createSignal(null),
    [cropper, setCropper] = createSignal(null),
    noPropagate = (e) => {
      e.preventDefault()
    },
    uploadFile = async (file) => {
      if (!file) return
      setUploading(true)
      setState('loading', true)
      setState('file', file)
      try {
        const reader = new FileReader()
        reader.onload = (e) => {
          setPreview(e.target.result)
          setCropper(
            new Cropper(cropImage, {
              aspectRatio: 1 / 1,
              viewMode: 1,
              rotatable: false,
            }),
          )
        }
        reader.readAsDataURL(file)
      } catch (e) {
        console.error('upload failed', e)
        const message = e instanceof Error ? e.message : String(e)
        setState('error', message)
      }
      setState('loading', false)
      setUploading(false)
    },
    handleFileDrop = async (e) => {
      e.preventDefault()
      setDropZoneActive(false)
      uploadFile(e.dataTransfer.files[0])
    },
    handleFileInput = async (e) => {
      e.preventDefault()
      uploadFile(e.currentTarget.files[0])
    }

  return (
    <>
      <Show when={preview() !== null}>
        <div>
          <div>
            <img ref={cropImage} src={preview()} alt="cropper" class="block max-w-full h-96 w-96" />
          </div>
          <button
            type="button"
            class="inline-flex items-center gap-x-1.5 rounded-md bg-indigo-600 py-2 px-3 text-sm font-semibold text-white shadow-sm hover:bg-indigo-500 focus-visible:outline focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-indigo-600 mt-2"
            onClick={() => {
              setState('croppedImage', cropper().getCroppedCanvas().toDataURL(state.file.type))
              props.saveImage(state)
            }}
          >
            Save
          </button>
        </div>
      </Show>
      <Show when={preview() === null}>
        <form class="min-h-96 min-w-96">
          <div
            id="dropzone"
            class={`${dropZoneActive() ? 'bg-green-100' : ''} ${
              uploading() && 'opacity-50'
            } place-content-center place-items-center h-96 w-96 border-2 border-gray-300 border-dashed rounded-md sm:flex p-2 m-2`}
            onDragEnter={() => (uploading() ? undefined : setDropZoneActive(true))}
            onDragLeave={() => setDropZoneActive(false)}
            onDragOver={noPropagate}
            onDrop={(event) => (uploading() ? noPropagate(event) : handleFileDrop(event))}
          >
            <div class="">upload</div>
            <input
              id="image-upload"
              name="file"
              type="file"
              disabled={uploading()}
              multiple={false}
              onInput={handleFileInput}
              class="sr-only"
            />
          </div>
          <div class="h-8" />
        </form>
      </Show>
    </>
  )
}