<script lang="ts">
  import Icon from '$lib/components/elements/icon.svelte';
  import { ProjectionType } from '$lib/constants';
  import { getAssetThumbnailUrl, isSharedLink } from '$lib/utils';
  import { getAltText } from '$lib/utils/thumbnail-util';
  import { timeToSeconds } from '$lib/utils/date-time';
  import { AssetMediaSize, AssetTypeEnum, type AssetResponseDto } from '@immich/sdk';
  import { locale, playVideoThumbnailOnHover } from '$lib/stores/preferences.store';
  import { getAssetPlaybackUrl } from '$lib/utils';
  import {
    mdiArchiveArrowDownOutline,
    mdiCameraBurst,
    mdiCheckCircle,
    mdiHeart,
    mdiMotionPauseOutline,
    mdiMotionPlayOutline,
    mdiRotate360,
  } from '@mdi/js';

  import { fade } from 'svelte/transition';
  import ImageThumbnail from './image-thumbnail.svelte';
  import VideoThumbnail from './video-thumbnail.svelte';
  import { currentUrlReplaceAssetId } from '$lib/utils/navigation';
  import { TUNABLES } from '$lib/utils/tunables';
  import { thumbhash } from '$lib/actions/thumbhash';
  import { mobileDevice } from '$lib/stores/mobile-device.svelte';

  interface Props {
    asset: AssetResponseDto;
    groupIndex?: number;
    thumbnailSize?: number | undefined;
    thumbnailWidth?: number | undefined;
    thumbnailHeight?: number | undefined;
    selected?: boolean;
    focussed?: boolean;
    selectionCandidate?: boolean;
    disabled?: boolean;
    readonly?: boolean;
    showArchiveIcon?: boolean;
    showStackedIcon?: boolean;
    disableMouseOver?: boolean;

    onClick?: ((asset: AssetResponseDto) => void) | undefined;
    onSelect?: ((asset: AssetResponseDto) => void) | undefined;
    onMouseEvent?: ((event: { isMouseOver: boolean; selectedGroupIndex: number }) => void) | undefined;
    handleFocus?: (() => void) | undefined;
    class?: string;
  }

  let {
    asset = $bindable(),
    groupIndex = 0,
    thumbnailSize = undefined,
    thumbnailWidth = undefined,
    thumbnailHeight = undefined,
    selected = false,
    focussed = false,
    selectionCandidate = false,
    disabled = false,
    readonly = false,
    showArchiveIcon = false,
    showStackedIcon = true,
    disableMouseOver = false,
    onClick = undefined,
    onSelect = undefined,
    onMouseEvent = undefined,
    handleFocus = undefined,
    class: className = '',
  }: Props = $props();

  let {
    IMAGE_THUMBNAIL: { THUMBHASH_FADE_DURATION },
  } = TUNABLES;

  let usingMobileDevice = $derived(mobileDevice.pointerCoarse);
  let focussableElement: HTMLElement | undefined = $state();
  let mouseOver = $state(false);
  let loaded = $state(false);

  $effect(() => {
    if (focussed && document.activeElement !== focussableElement) {
      focussableElement?.focus();
    }
  });

  let width = $derived(thumbnailSize || thumbnailWidth || 235);
  let height = $derived(thumbnailSize || thumbnailHeight || 235);

  const onIconClickedHandler = (e?: MouseEvent) => {
    e?.stopPropagation();
    e?.preventDefault();
    if (!disabled) {
      onSelect?.($state.snapshot(asset));
    }
  };

  const callClickHandlers = () => {
    if (selected) {
      onIconClickedHandler();
      return;
    }
    onClick?.($state.snapshot(asset));
  };

  const handleClick = (e: MouseEvent) => {
    if (e.ctrlKey || e.metaKey) {
      return;
    }
    e.stopPropagation();
    e.preventDefault();
    callClickHandlers();
  };

  const onMouseEnter = () => {
    if (usingMobileDevice) {
      return;
    }
    mouseOver = true;
    onMouseEvent?.({ isMouseOver: true, selectedGroupIndex: groupIndex });
  };

  const onMouseLeave = () => {
    mouseOver = false;
  };

  function longPress(element: HTMLElement, { onLongPress }: { onLongPress: () => void }) {
    let timer: ReturnType<typeof setTimeout>;
    const start = (event: TouchEvent) => {
      timer = setTimeout(() => {
        onLongPress();
        event.preventDefault();
      }, 350);
    };
    const end = () => clearTimeout(timer);
    element.addEventListener('touchstart', start);
    element.addEventListener('touchend', end);
    return {
      destroy: () => {
        element.removeEventListener('touchstart', start);
        element.removeEventListener('touchend', end);
      },
    };
  }
</script>

<div
  data-asset={asset.id}
  style:width="{width}px"
  style:height="{height}px"
  class="focus-visible:outline-none flex overflow-hidden {disabled
    ? 'bg-gray-300'
    : 'bg-immich-primary/20 dark:bg-immich-dark-primary/20'}"
>
  {#if !loaded && asset.thumbhash}
    <canvas
      use:thumbhash={{ base64ThumbHash: asset.thumbhash }}
      class="absolute object-cover z-10"
      style:width="{width}px"
      style:height="{height}px"
      out:fade={{ duration: THUMBHASH_FADE_DURATION }}
    ></canvas>
  {/if}

  <!-- as of iOS17, there is a preference for long press speed, which is not available for mobile web.
      The defaults are as follows:
      fast: 200ms
      default: 500ms
      slow: ??ms
      -->
  <div
    class="group"
    style:width="{width}px"
    style:height="{height}px"
    class:cursor-not-allowed={disabled}
    class:cursor-pointer={!disabled}
    onmouseenter={onMouseEnter}
    onmouseleave={onMouseLeave}
    use:longPress={{ onLongPress: () => onSelect?.($state.snapshot(asset)) }}
    onkeydown={(evt) => {
      if (evt.key === 'Enter') {
        callClickHandlers();
      }
      if (evt.key === 'x') {
        onSelect?.(asset);
      }
    }}
    tabindex={0}
    onclick={handleClick}
    role="link"
    bind:this={focussableElement}
    onfocus={handleFocus}
    data-testid="container-with-tabindex"
  >
    {#if !usingMobileDevice && mouseOver && !disableMouseOver}
      <!-- lazy show the url on mouse over-->
      <a
        class="absolute z-30 {className} top-[41px]"
        style:cursor="unset"
        style:width="{width}px"
        style:height="{height}px"
        href={currentUrlReplaceAssetId(asset.id)}
        onclick={(evt) => evt.preventDefault()}
        tabindex={-1}
        aria-label="Thumbnail URL"
      >
      </a>
    {/if}
    <div class="absolute z-20 {className}" style:width="{width}px" style:height="{height}px">
      <!-- Select asset button  -->
      {#if !readonly && (mouseOver || selected || selectionCandidate)}
        <button
          type="button"
          onclick={onIconClickedHandler}
          class="absolute p-2 focus:outline-none"
          class:cursor-not-allowed={disabled}
          role="checkbox"
          tabindex={-1}
          onfocus={handleFocus}
          aria-checked={selected}
          {disabled}
        >
          {#if disabled}
            <Icon path={mdiCheckCircle} size="24" class="text-zinc-800" />
          {:else if selected}
            <div class="rounded-full bg-[#D9DCEF] dark:bg-[#232932]">
              <Icon path={mdiCheckCircle} size="24" class="text-immich-primary" />
            </div>
          {:else}
            <Icon path={mdiCheckCircle} size="24" class="text-white/80 hover:text-white" />
          {/if}
        </button>
      {/if}
    </div>

    <div
      class="absolute h-full w-full select-none bg-transparent transition-transform"
      class:scale-[0.85]={selected}
      class:rounded-xl={selected}
    >
      <!-- Gradient overlay on hover -->
      {#if !usingMobileDevice}
        <div
          class="absolute z-10 h-full w-full bg-gradient-to-b from-black/25 via-[transparent_25%] opacity-0 transition-opacity group-hover:opacity-100"
          class:rounded-xl={selected}
        ></div>
      {/if}
      <!-- Outline on focus -->
      <div
        class="absolute size-full group-focus-visible:outline outline-4 -outline-offset-4 outline-immich-primary"
      ></div>

      <!-- Favorite asset star -->
      {#if !isSharedLink() && asset.isFavorite}
        <div class="absolute bottom-2 left-2 z-10">
          <Icon path={mdiHeart} size="24" class="text-white" />
        </div>
      {/if}

      {#if !isSharedLink() && showArchiveIcon && asset.isArchived}
        <div class="absolute {asset.isFavorite ? 'bottom-10' : 'bottom-2'} left-2 z-10">
          <Icon path={mdiArchiveArrowDownOutline} size="24" class="text-white" />
        </div>
      {/if}

      {#if asset.type === AssetTypeEnum.Image && asset.exifInfo?.projectionType === ProjectionType.EQUIRECTANGULAR}
        <div class="absolute right-0 top-0 z-20 flex place-items-center gap-1 text-xs font-medium text-white">
          <span class="pr-2 pt-2">
            <Icon path={mdiRotate360} size="24" />
          </span>
        </div>
      {/if}

      <!-- Stacked asset -->

      {#if asset.stack && showStackedIcon}
        <div
          class="absolute {asset.type == AssetTypeEnum.Image && asset.livePhotoVideoId == undefined
            ? 'top-0 right-0'
            : 'top-7 right-1'} z-20 flex place-items-center gap-1 text-xs font-medium text-white"
        >
          <span class="pr-2 pt-2 flex place-items-center gap-1">
            <p>{asset.stack.assetCount.toLocaleString($locale)}</p>
            <Icon path={mdiCameraBurst} size="24" />
          </span>
        </div>
      {/if}

      <ImageThumbnail
        url={getAssetThumbnailUrl({ id: asset.id, size: AssetMediaSize.Thumbnail, cacheKey: asset.thumbhash })}
        altText={$getAltText(asset)}
        widthStyle="{width}px"
        heightStyle="{height}px"
        curve={selected}
        onComplete={() => (loaded = true)}
      />

      {#if asset.type === AssetTypeEnum.Video}
        <div class="absolute top-0 h-full w-full">
          <VideoThumbnail
            url={getAssetPlaybackUrl({ id: asset.id, cacheKey: asset.thumbhash })}
            enablePlayback={mouseOver && $playVideoThumbnailOnHover}
            curve={selected}
            durationInSeconds={timeToSeconds(asset.duration)}
            playbackOnIconHover={!$playVideoThumbnailOnHover}
          />
        </div>
      {/if}

      {#if asset.type === AssetTypeEnum.Image && asset.livePhotoVideoId}
        <div class="absolute top-0 h-full w-full">
          <VideoThumbnail
            url={getAssetPlaybackUrl({ id: asset.livePhotoVideoId, cacheKey: asset.thumbhash })}
            pauseIcon={mdiMotionPauseOutline}
            playIcon={mdiMotionPlayOutline}
            showTime={false}
            curve={selected}
            playbackOnIconHover
          />
        </div>
      {/if}
    </div>
    {#if selectionCandidate}
      <div
        class="absolute top-0 h-full w-full bg-immich-primary opacity-40"
        in:fade={{ duration: 100 }}
        out:fade={{ duration: 100 }}
      ></div>
    {/if}
  </div>
</div>
