<script lang="ts">
  import ImageThumbnail from '$lib/components/assets/thumbnail/image-thumbnail.svelte';
  import Button from '$lib/components/elements/buttons/button.svelte';
  import SearchBar from '$lib/components/elements/search-bar.svelte';
  import Icon from '$lib/components/elements/icon.svelte';
  import { getPeopleThumbnailUrl } from '$lib/utils';
  import { getAllPeople, type PersonResponseDto } from '@immich/sdk';
  import { mdiClose, mdiArrowRight } from '@mdi/js';
  import { handleError } from '$lib/utils/handle-error';

  export let width: number;
  export let selectedPeople: Set<string>;

  let peoplePromise = getPeople();
  let showAllPeople = false;
  let name = '';
  $: numberOfPeople = (width - 80) / 85;

  function orderBySelectedPeopleFirst(people: PersonResponseDto[]) {
    return [
      ...people.filter((p) => selectedPeople.has(p.id)), //
      ...people.filter((p) => !selectedPeople.has(p.id)),
    ];
  }

  async function getPeople() {
    try {
      const res = await getAllPeople({ withHidden: false });
      return orderBySelectedPeopleFirst(res.people);
    } catch (error) {
      handleError(error, 'Failed to get people');
    }
  }

  function togglePersonSelection(id: string) {
    if (selectedPeople.has(id)) {
      selectedPeople.delete(id);
    } else {
      selectedPeople.add(id);
    }
    selectedPeople = selectedPeople;
  }

  const filterPeople = (list: PersonResponseDto[], name: string) => {
    const nameLower = name.toLowerCase();
    return name ? list.filter((p) => p.name.toLowerCase().startsWith(nameLower)) : list;
  };
</script>

{#await peoplePromise then people}
  {#if people && people.length > 0}
    {@const peopleList = showAllPeople ? filterPeople(people, name) : people.slice(0, numberOfPeople)}

    <div id="people-selection" class="-mb-4">
      <div class="flex items-center w-full justify-between gap-6">
        <p class="immich-form-label py-3">PEOPLE</p>

        {#if showAllPeople}
          <SearchBar bind:name placeholder="Filter people" isSearching={false} />
        {/if}
      </div>

      <div class="flex -mx-1 max-h-64 gap-1 mt-2 flex-wrap overflow-y-auto immich-scrollbar">
        {#each peopleList as person (person.id)}
          <button
            type="button"
            class="flex flex-col items-center w-20 rounded-3xl border-2 border-transparent hover:bg-immich-gray dark:hover:bg-immich-dark-primary/20 p-2 transition-all {selectedPeople.has(
              person.id,
            )
              ? 'dark:border-slate-500 border-slate-400 bg-slate-200 dark:bg-slate-800 dark:text-white'
              : ''}"
            on:click={() => togglePersonSelection(person.id)}
          >
            <ImageThumbnail
              circle
              shadow
              url={getPeopleThumbnailUrl(person.id)}
              altText={person.name}
              widthStyle="100%"
            />
            <p class="mt-2 line-clamp-2 text-sm font-medium dark:text-white">{person.name}</p>
          </button>
        {/each}
      </div>

      {#if showAllPeople || people.length > peopleList.length}
        <div class="flex justify-center mt-2">
          <Button
            shadow={false}
            color="text-primary"
            class="flex gap-2 place-items-center"
            on:click={() => (showAllPeople = !showAllPeople)}
          >
            {#if showAllPeople}
              <span><Icon path={mdiClose} /></span>
              Collapse
            {:else}
              <span><Icon path={mdiArrowRight} /></span>
              See all people
            {/if}
          </Button>
        </div>
      {/if}
    </div>
  {/if}
{/await}
