<script lang="ts">
  import { onMount } from "svelte";
  import { truncateMiddle } from "$lib/utils/truncateMiddle";
  import { auth } from "$lib/stores/auth";
  import type { MediaItem } from "$lib/api/types";
  import LibraryGrid from "./LibraryGrid.svelte";
  import TrackList from "./TrackList.svelte";
  import CachedImage from "$lib/components/common/CachedImage.svelte";
  import FavoriteButton from "$lib/components/FavoriteButton.svelte";
  import { favoriteOverrides, resolveIsFavorite } from "$lib/stores/favorites";

  interface Props {
    artist: MediaItem;
  }

  let { artist }: Props = $props();

  let albums = $state<MediaItem[]>([]);
  let singles = $state<MediaItem[]>([]);
  let topTracks = $state<MediaItem[]>([]);
  let relatedArtists = $state<MediaItem[]>([]);

  let albumsLoading = $state(true);
  let singlesLoading = $state(true);
  let tracksLoading = $state(true);
  let artistsLoading = $state(true);

  let showSingles = $state(false);
  let showAppears = $state(false);

  onMount(async () => {
    await loadArtistContent();
  });

  async function loadArtistContent() {
    try {
      const repo = auth.getRepository();
      if (!repo) return;

      // Load albums
      try {
        const albumsResult = await repo.getItems(artist.id, {
          includeItemTypes: ["MusicAlbum"],
          limit: 50,
          sortBy: "DateCreated",
          sortOrder: "Descending"
        });
        albums = albumsResult.items.filter(item => item.kind === "album");
      } catch (e) {
        console.warn("Failed to load albums:", e);
      } finally {
        albumsLoading = false;
      }

      // Load top tracks
      try {
        const tracksResult = await repo.getItems(artist.id, {
          includeItemTypes: ["Audio"],
          limit: 10,
          sortBy: "CommunityRating",
          sortOrder: "Descending"
        });
        topTracks = tracksResult.items.filter(item => item.kind === "track");
      } catch (e) {
        console.warn("Failed to load tracks:", e);
      } finally {
        tracksLoading = false;
      }

      // Load related artists (by genre)
      try {
        if (artist.genres && artist.genres.length > 0) {
          const relatedResult = await repo.getItems(artist.id, {
            includeItemTypes: ["MusicArtist"],
            genres: artist.genres.slice(0, 2),
            limit: 12,
            sortBy: "CommunityRating",
            sortOrder: "Descending"
          });
          relatedArtists = relatedResult.items
            .filter(item => item.id !== artist.id && item.kind === "artist")
            .slice(0, 6);
        }
      } catch (e) {
        console.warn("Failed to load related artists:", e);
      } finally {
        artistsLoading = false;
      }

      singlesLoading = false;
    } catch (e) {
      console.error("Error loading artist content:", e);
    }
  }
</script>

<div class="space-y-8">
  <!-- Hero Section -->
  <div class="relative">
    <!-- Backdrop -->
    {#if artist.backdropImageTags?.[0]}
      <div class="absolute inset-0 -z-10 h-96 overflow-hidden rounded-lg">
        <CachedImage
          itemId={artist.id}
          imageType="Backdrop"
          tag={artist.backdropImageTags[0]}
          maxWidth={1920}
          class="w-full h-full object-cover opacity-40"
        />
        <div class="absolute inset-0 bg-gradient-to-b from-transparent to-[var(--color-background)]"></div>
      </div>
    {/if}

    <!-- Artist Info -->
    <div class="flex flex-col items-center text-center py-12">
      <!-- Artist Image -->
      {#if artist.imageId}
        <div class="mb-6 rounded-full overflow-hidden w-40 h-40 shadow-lg">
          <CachedImage
            itemId={artist.id}
            imageType="Primary"
            tag={artist.imageId}
            maxWidth={400}
            alt={artist.name}
            class="w-full h-full object-cover"
          />
        </div>
      {/if}

      <!-- Artist Name -->
      <div class="flex items-center gap-2 mb-4">
        <h1 class="text-4xl font-bold text-white">{artist.name}</h1>
        <!-- TRACES: UR-068 | DR-119 -->
        <FavoriteButton
          itemId={artist.id}
          isFavorite={resolveIsFavorite(artist, $favoriteOverrides)}
          size="lg"
        />
      </div>

      <!-- Bio -->
      {#if artist.overview}
        <p class="text-gray-300 leading-relaxed max-w-3xl">
          {artist.overview}
        </p>
      {/if}
    </div>
  </div>

  <!-- Albums Section -->
  <div class="space-y-4">
    <h2 class="text-2xl font-semibold text-white">Albums</h2>
    {#if albumsLoading}
      <div class="grid grid-cols-2 md:grid-cols-4 lg:grid-cols-6 gap-4">
        {#each Array(6) as _}
          <div class="animate-pulse">
            <div class="aspect-square bg-[var(--color-surface)] rounded-lg mb-2"></div>
            <div class="h-4 bg-[var(--color-surface)] rounded w-3/4 mb-1"></div>
            <div class="h-3 bg-[var(--color-surface)] rounded w-1/2"></div>
          </div>
        {/each}
      </div>
    {:else if albums.length === 0}
      <p class="text-gray-400">No albums found</p>
    {:else}
      <div class="grid grid-cols-2 md:grid-cols-4 lg:grid-cols-6 gap-4">
        {#each albums as album (album.id)}
          <a
            href="/library/{album.id}"
            class="group cursor-pointer"
          >
            <div class="aspect-square bg-[var(--color-surface)] rounded-lg overflow-hidden mb-2 group-hover:opacity-80 transition-opacity">
              {#if album.imageId}
                <CachedImage
                  itemId={album.id}
                  imageType="Primary"
                  tag={album.imageId}
                  maxWidth={200}
                  alt={album.name}
                  class="w-full h-full object-cover"
                />
              {/if}
            </div>
            <p class="text-sm font-medium text-white truncate group-hover:text-[var(--color-jellyfin)] transition-colors">
              {truncateMiddle(album.name, 40)}
            </p>
            {#if album.productionYear}
              <p class="text-xs text-gray-400">{album.productionYear}</p>
            {/if}
          </a>
        {/each}
      </div>
    {/if}
  </div>

  <!-- Top Tracks Section -->
  {#if topTracks.length > 0}
    <div class="space-y-4">
      <h2 class="text-2xl font-semibold text-white">Top Tracks</h2>
      <TrackList
        tracks={topTracks}
        loading={tracksLoading}
        showAlbum={true}
        showArtist={false}
        showDownload={false}
      />
    </div>
  {/if}

  <!-- Related Artists Section -->
  {#if relatedArtists.length > 0}
    <div class="space-y-4">
      <h2 class="text-2xl font-semibold text-white">Similar Artists</h2>
      {#if artistsLoading}
        <div class="grid grid-cols-2 md:grid-cols-4 lg:grid-cols-6 gap-4">
          {#each Array(6) as _}
            <div class="animate-pulse text-center">
              <div class="w-32 h-32 bg-[var(--color-surface)] rounded-full mb-2 mx-auto"></div>
              <div class="h-4 bg-[var(--color-surface)] rounded w-3/4 mx-auto"></div>
            </div>
          {/each}
        </div>
      {:else}
        <div class="grid grid-cols-2 md:grid-cols-4 lg:grid-cols-6 gap-4">
          {#each relatedArtists as relatedArtist (relatedArtist.id)}
            <a
              href="/library/{relatedArtist.id}"
              class="group text-center"
            >
              <div class="w-32 h-32 bg-[var(--color-surface)] rounded-full overflow-hidden mb-2 mx-auto group-hover:opacity-80 transition-opacity">
                {#if relatedArtist.imageId}
                  <CachedImage
                    itemId={relatedArtist.id}
                    imageType="Primary"
                    tag={relatedArtist.imageId}
                    maxWidth={200}
                    alt={relatedArtist.name}
                    class="w-full h-full object-cover"
                  />
                {/if}
              </div>
              <p class="text-sm font-medium text-white truncate group-hover:text-[var(--color-jellyfin)] transition-colors">
                {relatedArtist.name}
              </p>
            </a>
          {/each}
        </div>
      {/if}
    </div>
  {/if}
</div>
