import { useParams, useNavigate } from 'react-router';
import { useTranslation } from 'react-i18next';
import { ScrollArea, IconButton, Button, Card } from '@olly/modern-sk';
import {
  useGetArtistQuery,
  useGetArtistAlbumsQuery,
  useGetArtistTracksQuery,
} from '../../api/endpoints/library';
import { TrackRow } from '../../components/track/TrackRow';
import { ArtTile } from '../../components/common/ArtTile';
import { LoadingSkeleton } from '../../components/common/LoadingSkeleton';
import { ErrorState } from '../../components/common/ErrorState';
import { EmptyState } from '../../components/common/EmptyState';
import { useAppDispatch } from '../../hooks/useAppDispatch';
import { setQueue } from '../../store/slices/queue';
import { formatDuration } from '../../lib/format';
import { getCoverUrl } from '../../api/endpoints/streaming';
import type { Album } from '../../api/types';

export function ArtistDetailPage() {
  const { t } = useTranslation();
  const { artistId } = useParams<{ artistId: string }>();
  const navigate = useNavigate();
  const dispatch = useAppDispatch();

  const artistQuery = useGetArtistQuery(artistId ?? '', { skip: !artistId });
  const albumsQuery = useGetArtistAlbumsQuery(artistId ?? '', {
    skip: !artistId,
  });
  const tracksQuery = useGetArtistTracksQuery(artistId ?? '', {
    skip: !artistId,
  });

  if (artistQuery.isLoading) {
    return (
      <div style={{ padding: '1.5rem' }}>
        <LoadingSkeleton rows={10} />
      </div>
    );
  }

  if (artistQuery.isError || !artistQuery.data) {
    return (
      <ErrorState
        message={t('artist.error')}
        onRetry={() => artistQuery.refetch()}
      />
    );
  }

  const artist = artistQuery.data;
  const albums = albumsQuery.data ?? [];
  const tracks = tracksQuery.data ?? [];

  const handlePlayAll = () => {
    if (!tracks.length) return;
    dispatch(
      setQueue({
        entries: tracks.map((tr) => ({
          trackId: tr.id,
          title: tr.title,
          artistName: tr.artistName,
          albumTitle: tr.albumTitle,
          durationMs: tr.durationMs,
          albumArtUrl: tr.albumArtUrl,
        })),
        source: 'artist',
        sourceId: artist.id,
        sourceName: artist.name,
      }),
    );
  };

  return (
    <div style={{ display: 'flex', flexDirection: 'column', height: '100%' }}>
      <div
        style={{
          padding: '1.25rem 1.5rem',
          borderBottom: '1px solid var(--color-border)',
          display: 'flex',
          alignItems: 'center',
          gap: '1rem',
          flexShrink: 0,
        }}
      >
        <IconButton
          variant="ghost"
          size="sm"
          onClick={() => navigate(-1)}
          aria-label={t('common.back')}
        >
          ←
        </IconButton>
        <div
          style={{
            display: 'flex',
            gap: '1.5rem',
            alignItems: 'center',
            flex: 1,
          }}
        >
          <ArtTile seed={artist.id} label={artist.name} size={96} radius={48} />
          <div>
            <p
              style={{
                margin: 0,
                fontSize: '0.75rem',
                color: 'var(--color-text-3)',
                textTransform: 'uppercase',
                letterSpacing: '0.05em',
              }}
            >
              {t('artist.type')}
            </p>
            <h1
              style={{
                margin: '0.25rem 0',
                fontSize: '1.5rem',
                fontWeight: 700,
              }}
            >
              {artist.name}
            </h1>
            <p
              style={{
                margin: 0,
                color: 'var(--color-text-2)',
                fontSize: '0.875rem',
              }}
            >
              {t('artist.meta', {
                albumCount: artist.albumCount,
                trackCount: artist.trackCount,
              })}
            </p>
          </div>
        </div>
        <Button
          variant="primary"
          onClick={handlePlayAll}
          disabled={!tracks.length}
        >
          {t('artist.play')}
        </Button>
      </div>

      <ScrollArea style={{ flex: 1 }}>
        {/* Discography */}
        <section style={{ padding: '1.25rem 1.5rem 0' }}>
          <h2
            style={{ margin: '0 0 0.75rem', fontSize: '1rem', fontWeight: 600 }}
          >
            {t('artist.albums')}
          </h2>
          {albumsQuery.isLoading && <LoadingSkeleton rows={3} height={72} />}
          {albumsQuery.isError && (
            <ErrorState onRetry={() => albumsQuery.refetch()} />
          )}
          {!albumsQuery.isLoading &&
            !albumsQuery.isError &&
            albums.length === 0 && (
              <p style={{ color: 'var(--color-text-3)', fontSize: '0.875rem' }}>
                {t('artist.noAlbums')}
              </p>
            )}
          {albums.length > 0 && (
            <div
              style={{
                display: 'grid',
                gridTemplateColumns: 'repeat(auto-fill, minmax(9rem, 1fr))',
                gap: '1rem',
              }}
            >
              {albums.map((album) => (
                <AlbumCard
                  key={album.id}
                  album={album}
                  onClick={() => void navigate(`/albums/${album.id}`)}
                />
              ))}
            </div>
          )}
        </section>

        {/* All tracks */}
        <section style={{ padding: '1.5rem 0 0.5rem' }}>
          <h2
            style={{
              margin: '0 1.5rem 0.5rem',
              fontSize: '1rem',
              fontWeight: 600,
            }}
          >
            {t('artist.tracks')}
          </h2>
          {tracksQuery.isLoading && <LoadingSkeleton rows={6} />}
          {tracksQuery.isError && (
            <ErrorState onRetry={() => tracksQuery.refetch()} />
          )}
          {!tracksQuery.isLoading &&
            !tracksQuery.isError &&
            tracks.length === 0 && (
              <EmptyState
                icon="♫"
                title={t('artist.empty.title')}
                description={t('artist.empty.description')}
              />
            )}
          {tracks.map((track, i) => (
            <TrackRow key={track.id} track={track} index={i} showAlbum />
          ))}
        </section>
      </ScrollArea>
    </div>
  );
}

function AlbumCard({ album, onClick }: { album: Album; onClick: () => void }) {
  const { t } = useTranslation();
  const artUrl = getCoverUrl(album.artUrl);
  return (
    <Card
      onClick={onClick}
      style={{
        cursor: 'pointer',
        padding: '0.75rem',
        display: 'flex',
        flexDirection: 'column',
        gap: '0.5rem',
      }}
    >
      {artUrl ? (
        <img
          src={artUrl}
          alt={album.title}
          style={{
            width: '100%',
            aspectRatio: '1',
            objectFit: 'cover',
            borderRadius: 6,
          }}
        />
      ) : (
        <div style={{ width: '100%', aspectRatio: '1' }}>
          <ArtTile seed={album.id} label={album.title} size={144} radius={6} />
        </div>
      )}
      <div>
        <div
          style={{
            fontWeight: 600,
            fontSize: '0.8125rem',
            overflow: 'hidden',
            textOverflow: 'ellipsis',
            whiteSpace: 'nowrap',
          }}
        >
          {album.title}
        </div>
        <div style={{ fontSize: '0.6875rem', color: 'var(--color-text-3)' }}>
          {album.year ? `${album.year} · ` : ''}
          {t('library.albumCard.tracksDuration', {
            count: album.trackCount,
            duration: formatDuration(album.totalDurationMs),
          })}
        </div>
      </div>
    </Card>
  );
}