<script lang="ts">
  import { user } from '$lib/stores/user.store';
  import { handleError } from '$lib/utils/handle-error';
  import { createProfileImage, type AssetResponseDto } from '@immich/sdk';
  import { Button, Modal, ModalBody, ModalFooter, toastManager } from '@immich/ui';
  import domtoimage from 'dom-to-image';
  import { onMount } from 'svelte';
  import { t } from 'svelte-i18n';
  import PhotoViewer from '../components/asset-viewer/photo-viewer.svelte';

  interface Props {
    asset: AssetResponseDto;
    onClose: () => void;
  }

  let { asset, onClose }: Props = $props();

  let imgElement: HTMLDivElement | undefined = $state();

  onMount(() => {
    if (!imgElement) {
      return;
    }

    imgElement.style.width = '100%';
  });

  const hasTransparentPixels = async (blob: Blob) => {
    const img = new Image();
    img.src = URL.createObjectURL(blob);
    await img.decode();
    const canvas = document.createElement('canvas');
    canvas.width = img.width;
    canvas.height = img.height;
    const context = canvas.getContext('2d');
    if (!context) {
      throw new Error('Could not get canvas context.');
    }
    context.drawImage(img, 0, 0);
    const imageData = context.getImageData(0, 0, canvas.width, canvas.height);
    const data = imageData?.data;
    if (!data) {
      throw new Error('Could not get image data.');
    }
    for (let index = 0; index < data.length; index += 4) {
      if (data[index + 3] < 255) {
        return true;
      }
    }
    return false;
  };

  const handleSetProfilePicture = async () => {
    if (!imgElement) {
      return;
    }

    try {
      const imgElementHeight = imgElement.offsetHeight;
      const imgElementWidth = imgElement.offsetWidth;
      const blob = await domtoimage.toBlob(imgElement, {
        width: imgElementWidth,
        height: imgElementHeight,
      });

      if (await hasTransparentPixels(blob)) {
        toastManager.danger($t('errors.profile_picture_transparent_pixels'));
        return;
      }
      const file = new File([blob], 'profile-picture.png', { type: 'image/png' });
      const { profileImagePath, profileChangedAt } = await createProfileImage({ createProfileImageDto: { file } });
      toastManager.success($t('profile_picture_set'));
      $user.profileImagePath = profileImagePath;
      $user.profileChangedAt = profileChangedAt;
    } catch (error) {
      handleError(error, $t('errors.unable_to_set_profile_picture'));
    }
    onClose();
  };
</script>

<Modal size="small" title={$t('set_profile_picture')} {onClose}>
  <ModalBody>
    <div class="flex place-items-center items-center justify-center">
      <div
        class="relative flex aspect-square w-62.5 overflow-hidden rounded-full border-4 border-immich-primary bg-immich-dark-primary dark:border-immich-dark-primary dark:bg-immich-primary"
      >
        <PhotoViewer bind:element={imgElement} {asset} />
      </div>
    </div>
  </ModalBody>
  <ModalFooter>
    <Button fullWidth shape="round" onclick={handleSetProfilePicture}>{$t('set_as_profile_picture')}</Button>
  </ModalFooter>
</Modal>
