<script lang="ts">
  import { onMount } from "svelte";
  import { goto } from "$app/navigation";
  import { playerController } from "$lib/player";
  import type { MediaItem, PlaylistEntry } from "$lib/api/types";
  import { auth } from "$lib/stores/auth";
  import { toast } from "$lib/stores/toast";
  import TrackList from "./TrackList.svelte";
  import CachedImage from "$lib/components/common/CachedImage.svelte";
  import FavoriteButton from "$lib/components/FavoriteButton.svelte";
  import { favoriteOverrides } from "$lib/stores/favorites";
  import { formatDuration } from "$lib/utils/duration";

  interface Props {
    playlist: MediaItem;
  }

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

  let entries = $state<PlaylistEntry[]>([]);
  let loading = $state(true);
  let editingName = $state(false);
  let editName = $state("");
  let showDeleteConfirm = $state(false);

  // Extract MediaItem[] from PlaylistEntry[] for TrackList
  const tracks = $derived(entries.map(e => ({ ...e } as MediaItem)));

  const totalDuration = $derived(
    entries.reduce((sum, e) => sum + (e.durationMs ?? 0), 0)
  );

  onMount(() => {
    loadPlaylistItems();
  });

  async function loadPlaylistItems() {
    loading = true;
    try {
      const repo = auth.getRepository();
      entries = await repo.getPlaylistItems(playlist.id);
    } catch (e) {
      console.error("[PlaylistDetail] Failed to load items:", e);
      toast.error("Failed to load playlist items");
    } finally {
      loading = false;
    }
  }

  async function handlePlayAll() {
    if (entries.length === 0) return;
    try {
      const trackIds = entries.map(e => e.id);
      await playerController.playTracks({
        trackIds,
        startIndex: 0,
        shuffle: false,
        context: {
          type: "playlist",
          playlistId: playlist.id,
          playlistName: playlist.name,
        },
      });
    } catch (e) {
      console.error("[PlaylistDetail] Failed to play all:", e);
      toast.error("Failed to play playlist");
    }
  }

  async function handleShufflePlay() {
    if (entries.length === 0) return;
    try {
      const trackIds = entries.map(e => e.id);
      await playerController.playTracks({
        trackIds,
        startIndex: 0,
        shuffle: true,
        context: {
          type: "playlist",
          playlistId: playlist.id,
          playlistName: playlist.name,
        },
      });
    } catch (e) {
      console.error("[PlaylistDetail] Failed to shuffle play:", e);
      toast.error("Failed to shuffle playlist");
    }
  }

  async function handleRename() {
    const trimmed = editName.trim();
    if (!trimmed || trimmed === playlist.name) {
      editingName = false;
      editName = playlist.name;
      return;
    }
    try {
      const repo = auth.getRepository();
      await repo.renamePlaylist(playlist.id, trimmed);
      playlist.name = trimmed;
      toast.success("Playlist renamed");
    } catch (e) {
      console.error("[PlaylistDetail] Failed to rename:", e);
      toast.error("Failed to rename playlist");
      editName = playlist.name;
    } finally {
      editingName = false;
    }
  }

  async function handleDelete() {
    try {
      const repo = auth.getRepository();
      await repo.deletePlaylist(playlist.id);
      toast.success("Playlist deleted");
      goto("/library");
    } catch (e) {
      console.error("[PlaylistDetail] Failed to delete:", e);
      toast.error("Failed to delete playlist");
    } finally {
      showDeleteConfirm = false;
    }
  }

  async function handleRemoveTrack(entry: PlaylistEntry) {
    try {
      const repo = auth.getRepository();
      await repo.removeFromPlaylist(playlist.id, [entry.playlistItemId]);
      entries = entries.filter(e => e.playlistItemId !== entry.playlistItemId);
      toast.success("Track removed");
    } catch (e) {
      console.error("[PlaylistDetail] Failed to remove track:", e);
      toast.error("Failed to remove track");
    }
  }

  function handleRenameKeydown(e: KeyboardEvent) {
    if (e.key === "Enter") handleRename();
    if (e.key === "Escape") {
      editingName = false;
      editName = playlist.name;
    }
  }
</script>

<div class="space-y-6">
  <!-- Header -->
  <div class="flex gap-6 pt-4">
    <!-- Playlist artwork -->
    <div class="flex-shrink-0 w-48">
      {#if playlist.imageId}
        <CachedImage
          itemId={playlist.id}
          imageType="Primary"
          tag={playlist.imageId}
          maxWidth={400}
          alt={playlist.name}
          class="w-full rounded-lg shadow-lg"
        />
      {:else}
        <div class="w-full aspect-square bg-[var(--color-surface)] rounded-lg flex items-center justify-center">
          <svg class="w-16 h-16 text-gray-600" fill="currentColor" viewBox="0 0 24 24">
            <path d="M15 6H3v2h12V6zm0 4H3v2h12v-2zM3 16h8v-2H3v2zM17 6v8.18c-.31-.11-.65-.18-1-.18-1.66 0-3 1.34-3 3s1.34 3 3 3 3-1.34 3-3V8h3V6h-5z"/>
          </svg>
        </div>
      {/if}
    </div>

    <!-- Info -->
    <div class="flex-1 space-y-4">
      <div>
        {#if editingName}
          <input
            type="text"
            bind:value={editName}
            onkeydown={handleRenameKeydown}
            onblur={handleRename}
            class="text-3xl font-bold bg-transparent border-b-2 border-[var(--color-jellyfin)] text-white outline-none w-full"
          />
        {:else}
          <button
            class="text-3xl font-bold text-white cursor-pointer hover:text-[var(--color-jellyfin)] transition-colors bg-transparent border-none p-0 text-left"
            onclick={() => { editingName = true; editName = playlist.name; }}
            title="Click to rename"
          >
            {playlist.name}
          </button>
        {/if}
        <p class="text-sm text-gray-400 mt-1">
          {entries.length} track{entries.length !== 1 ? "s" : ""}
          {#if totalDuration > 0}
            &middot; {formatDuration(totalDuration)}
          {/if}
        </p>
      </div>

      <!-- Actions -->
      <div class="flex gap-3 flex-wrap">
        <button
          onclick={handlePlayAll}
          disabled={entries.length === 0}
          class="px-6 py-2 bg-[var(--color-jellyfin)] hover:bg-[var(--color-jellyfin-dark)] disabled:opacity-50 disabled:cursor-not-allowed rounded-lg font-medium flex items-center gap-2 transition-colors"
        >
          <svg class="w-5 h-5" fill="currentColor" viewBox="0 0 24 24">
            <path d="M8 5v14l11-7z"/>
          </svg>
          Play All
        </button>
        <button
          onclick={handleShufflePlay}
          disabled={entries.length === 0}
          class="px-6 py-2 bg-[var(--color-surface)] hover:bg-[var(--color-surface-hover)] disabled:opacity-50 disabled:cursor-not-allowed rounded-lg font-medium flex items-center gap-2 transition-colors"
        >
          <svg class="w-5 h-5" fill="currentColor" viewBox="0 0 24 24">
            <path d="M10.59 9.17L5.41 4 4 5.41l5.17 5.17 1.42-1.41zM14.5 4l2.04 2.04L4 18.59 5.41 20 17.96 7.46 20 9.5V4h-5.5zm.33 9.41l-1.41 1.41 3.13 3.13L14.5 20H20v-5.5l-2.04 2.04-3.13-3.13z"/>
          </svg>
          Shuffle
        </button>
        <!-- TRACES: UR-068 | DR-119 -->
        <FavoriteButton
          itemId={playlist.id}
          isFavorite={$favoriteOverrides.get(playlist.id) ?? false}
          size="lg"
          className="self-center"
        />
        <button
          onclick={() => showDeleteConfirm = true}
          class="px-4 py-2 bg-[var(--color-surface)] hover:bg-red-900/50 text-red-400 hover:text-red-300 rounded-lg font-medium flex items-center gap-2 transition-colors"
        >
          <svg class="w-5 h-5" fill="currentColor" viewBox="0 0 24 24">
            <path d="M6 19c0 1.1.9 2 2 2h8c1.1 0 2-.9 2-2V7H6v12zM19 4h-3.5l-1-1h-5l-1 1H5v2h14V4z"/>
          </svg>
          Delete
        </button>
      </div>

      {#if playlist.overview}
        <p class="text-gray-300 leading-relaxed max-w-2xl">{playlist.overview}</p>
      {/if}
    </div>
  </div>

  <!-- Tracks -->
  <div class="space-y-4">
    <h2 class="text-xl font-semibold text-white">Tracks</h2>
    <TrackList
      {tracks}
      {loading}
      showArtist={true}
      showAlbum={true}
      context={{ type: "playlist", playlistId: playlist.id, playlistName: playlist.name }}
    />

    {#if !loading && entries.length > 0}
      <div class="space-y-1 mt-4">
        {#each entries as entry, i (entry.playlistItemId)}
          <div class="flex items-center justify-end px-4 -mt-1">
            <button
              onclick={() => handleRemoveTrack(entry)}
              class="text-gray-500 hover:text-red-400 p-1 transition-colors"
              title="Remove from playlist"
            >
              <svg class="w-4 h-4" fill="currentColor" viewBox="0 0 24 24">
                <path d="M19 13H5v-2h14v2z"/>
              </svg>
            </button>
          </div>
        {/each}
      </div>
    {/if}
  </div>

  <!-- Delete Confirmation Dialog -->
  {#if showDeleteConfirm}
    <!-- svelte-ignore a11y_no_static_element_interactions -->
    <div
      class="fixed inset-0 bg-black/60 flex items-center justify-center z-50"
      onclick={() => showDeleteConfirm = false}
      onkeydown={(e) => { if (e.key === "Escape") showDeleteConfirm = false; }}
      role="dialog"
      aria-modal="true"
      tabindex="-1"
    >
      <div
        class="bg-[var(--color-surface)] rounded-xl p-6 max-w-sm mx-4 space-y-4"
        onclick={(e) => e.stopPropagation()}
        onkeydown={(e) => e.stopPropagation()}
        role="presentation"
      >
        <h3 class="text-lg font-semibold text-white">Delete Playlist?</h3>
        <p class="text-gray-300">
          Are you sure you want to delete "{playlist.name}"? This action cannot be undone.
        </p>
        <div class="flex gap-3 justify-end">
          <button
            onclick={() => showDeleteConfirm = false}
            class="px-4 py-2 bg-[var(--color-surface-hover)] hover:bg-gray-600 rounded-lg transition-colors"
          >
            Cancel
          </button>
          <button
            onclick={handleDelete}
            class="px-4 py-2 bg-red-600 hover:bg-red-700 text-white rounded-lg transition-colors"
          >
            Delete
          </button>
        </div>
      </div>
    </div>
  {/if}
</div>
