import { useCallback, useEffect, useId, useRef, useState, type CSSProperties } from 'react';
import { createPortal } from 'react-dom';
import { Link } from '@tanstack/react-router';
import { useTranslation } from 'react-i18next';

import { ArtistLinks, Cover } from '../entities/catalog';
import { usePlayer, usePlayerState } from '../player/context';
import { formatDuration } from '../shared/lib/format';
import { shareTrack } from '../shared/lib/share';
import {
  albumIcon,
  closeIcon,
  dislikeFillIcon,
  dislikeIcon,
  likeFillIcon,
  likeIcon,
  musicIcon,
  nextIcon,
  pauseIcon,
  playIcon,
  prevIcon,
  queueIcon,
  repeatIcon,
  repeatOneIcon,
  shuffleIcon,
  shareIcon,
  volumeIcon,
  volumeOffIcon,
  waveIcon,
} from '../shared/ui/icons';
import { cx, Icon } from '../shared/ui/ui';
import s from './PlayerBar.module.css';

/** Плеер: полоса внизу (`bar`, по умолчанию) или плавающий остров (`island`) — выбор в настройках (docs/design.md). */
export function PlayerBar({ variant = 'bar' }: { variant?: 'bar' | 'island' }) {
  const { t } = useTranslation();
  const player = usePlayer();
  const st = usePlayerState();
  const [queueOpen, setQueueOpen] = useState(false);
  const [shareStatus, setShareStatus] = useState<'copied' | 'error' | null>(null);
  const [sharing, setSharing] = useState(false);
  useEffect(() => {
    setShareStatus(null);
  }, [st.track?.id]);
  useEffect(() => {
    if (!shareStatus) return;
    const timer = setTimeout(() => setShareStatus(null), 4000);
    return () => clearTimeout(timer);
  }, [shareStatus]);
  const queueButton = useRef<HTMLButtonElement>(null);
  const queueId = useId();
  const closeQueue = useCallback(() => {
    setQueueOpen(false);
    queueButton.current?.focus(); // фокус — туда, откуда открыли
  }, []);
  const track = st.track;

  if (!track) {
    return (
      <footer className={cx(s.bar, variant === 'island' && s.island)} aria-label={t('player.label')}>
        <span className={s.empty}>
          <span className={s.placeholder}>
            <Icon src={musicIcon} size={22} />
          </span>
          {t('player.empty')}
        </span>
      </footer>
    );
  }

  const react = (r: 'like' | 'dislike') => void player.react(track, track.reaction === r ? null : r).catch(() => undefined);
  const share = async () => {
    setSharing(true);
    setShareStatus(null);
    try {
      const result = await shareTrack(track.id, track.title);
      if (result === 'copied') setShareStatus('copied');
    } catch {
      setShareStatus('error');
    } finally {
      setSharing(false);
    }
  };
  const repeatLabel = t(`player.repeat_${st.repeat}`);
  const ctx = st.context;
  const tr = t as unknown as (k: string, o?: Record<string, unknown>) => string;
  const source = !ctx
    ? null
    : ctx.type === 'wave'
      ? ctx.label
        ? t('player.source_wave_seed', { label: ctx.label })
        : t('player.source_wave')
      : ctx.type === 'collection'
        ? ctx.label ?? tr(`player.source_${ctx.id === 'dislikes' ? 'dislikes' : 'likes'}`)
        : tr(`player.source_${ctx.type}`, { label: ctx.label ?? '' });

  return (
    <footer className={cx(s.bar, variant === 'island' && s.island)} aria-label={t('player.label')}>
      <div className={s.now}>
        <Cover album={track.album} size={52} />
        <div className={s.meta}>
          <span className={s.title}>{track.title}</span>
          <span className={s.artists}>
            <ArtistLinks artists={track.artists} />
          </span>
          {source &&
            (ctx?.type === 'album' && ctx.id ? (
              <Link to="/album/$id" params={{ id: ctx.id }} className={s.source}>
                <Icon src={albumIcon} size={14} />
                {source}
              </Link>
            ) : (
              <span className={cx(s.source, ctx?.type === 'wave' && s.sourceWave)}>
                <Icon src={ctx?.type === 'wave' ? waveIcon : albumIcon} size={14} />
                {source}
              </span>
            ))}
        </div>
      </div>

      <div className={s.center}>
        <div className={s.controls}>
          <button
            type="button"
            className={cx(s.icon, track.reaction === 'dislike' && s.danger)}
            aria-label={t(track.reaction === 'dislike' ? 'player.undislike' : 'player.dislike')}
            aria-pressed={track.reaction === 'dislike'}
            onClick={() => react('dislike')}
          >
            <Icon src={track.reaction === 'dislike' ? dislikeFillIcon : dislikeIcon} />
          </button>
          <button type="button" className={s.icon} aria-label={t('player.prev')} onClick={() => player.prev()}>
            <Icon src={prevIcon} size={26} />
          </button>
          <button
            type="button"
            className={s.play}
            aria-label={t(st.playing ? 'player.pause' : 'player.play')}
            aria-busy={st.loading || undefined}
            onClick={() => player.toggle()}
          >
            <Icon src={st.playing ? pauseIcon : playIcon} size={28} />
          </button>
          <button type="button" className={s.icon} aria-label={t('player.next')} onClick={() => player.next()}>
            <Icon src={nextIcon} size={26} />
          </button>
          <button
            type="button"
            className={cx(s.icon, track.reaction === 'like' && s.accent)}
            aria-label={t(track.reaction === 'like' ? 'player.unlike' : 'player.like')}
            aria-pressed={track.reaction === 'like'}
            onClick={() => react('like')}
          >
            <Icon src={track.reaction === 'like' ? likeFillIcon : likeIcon} />
          </button>
        </div>
        <div className={s.progress}>
          <span className={s.time}>{formatDuration(st.positionMs)}</span>
          <input
            type="range"
            className={s.range}
            min={0}
            max={st.durationMs || track.duration_ms}
            step={1000}
            value={Math.min(st.positionMs, st.durationMs || track.duration_ms)}
            aria-label={t('player.progress')}
            aria-valuetext={formatDuration(st.positionMs)}
            onChange={(e) => player.seek(Number(e.target.value))}
            style={{ '--pct': `${(st.positionMs / (st.durationMs || track.duration_ms)) * 100}%` } as CSSProperties}
          />
          <span className={s.time}>{formatDuration(st.durationMs || track.duration_ms)}</span>
        </div>
        {st.error && (
          <span className={s.error} role="status">
            {t(st.error as 'player.error')}
          </span>
        )}
      </div>

      <div className={s.right}>
        <button type="button" className={cx(s.icon, s.shareButton)} aria-label={t('player.share')} title={t('player.share')} disabled={sharing} onClick={() => void share()}>
          <Icon src={shareIcon} size={20} />
        </button>
        <button
          type="button"
          className={cx(s.icon, st.shuffle && s.accent)}
          aria-label={t('player.shuffle')}
          aria-pressed={st.shuffle}
          onClick={() => player.toggleShuffle()}
        >
          <Icon src={shuffleIcon} size={20} />
        </button>
        <button
          type="button"
          className={cx(s.icon, st.repeat !== 'off' && s.accent)}
          aria-label={repeatLabel}
          title={repeatLabel}
          onClick={() => player.cycleRepeat()}
        >
          <Icon src={st.repeat === 'one' ? repeatOneIcon : repeatIcon} size={20} />
        </button>
        <button
          ref={queueButton}
          type="button"
          className={cx(s.icon, s.queueButton, queueOpen && s.accent)}
          aria-label={t('player.queue')}
          aria-expanded={queueOpen}
          aria-controls={queueOpen ? queueId : undefined}
          onClick={() => setQueueOpen((v) => !v)}
        >
          <Icon src={queueIcon} size={20} />
        </button>
        <button
          type="button"
          className={s.icon}
          aria-label={t(st.muted ? 'player.unmute' : 'player.mute')}
          onClick={() => player.toggleMute()}
        >
          <Icon src={st.muted || st.volume === 0 ? volumeOffIcon : volumeIcon} size={20} />
        </button>
        <input
          type="range"
          className={cx(s.range, s.volume)}
          min={0}
          max={1}
          step={0.01}
          value={st.muted ? 0 : st.volume}
          aria-label={t('player.volume')}
          onChange={(e) => player.setVolume(Number(e.target.value))}
          style={{ '--pct': `${(st.muted ? 0 : st.volume) * 100}%` } as CSSProperties}
        />
      </div>
      {queueOpen && <QueueDrawer id={queueId} variant={variant} onClose={closeQueue} />}
      {shareStatus && <span className={s.shareStatus} role="status">{t(shareStatus === 'copied' ? 'player.link_copied' : 'player.share_error')}</span>}
    </footer>
  );
}

/** Очередь воспроизведения (выдвижная панель справа): что играет и что дальше, клик — перейти к треку. */
function QueueDrawer({ id, variant, onClose }: { id: string; variant: 'bar' | 'island'; onClose: () => void }) {
  const { t } = useTranslation();
  const player = usePlayer();
  const st = usePlayerState();
  const upcoming = st.queue.slice(st.index, st.index + 40);
  const close = useRef<HTMLButtonElement>(null);
  // Клавиатура: при открытии фокус в панель, Escape закрывает.
  useEffect(() => {
    close.current?.focus();
    const onKey = (e: KeyboardEvent) => {
      if (e.key === 'Escape') onClose();
    };
    document.addEventListener('keydown', onKey);
    return () => document.removeEventListener('keydown', onKey);
  }, [onClose]);
  // Портал: у плеера backdrop-filter, а он делает fixed-потомков относительными к себе.
  return createPortal(
    <aside id={id} className={cx(s.drawer, variant === 'island' && s.drawerIsland)} aria-label={t('player.queue')}>
      <div className={s.drawerHead}>
        <span>{t('player.queue')}</span>
        <button ref={close} type="button" className={s.icon} aria-label={t('form.close')} onClick={onClose}>
          <Icon src={closeIcon} size={20} />
        </button>
      </div>
      <div className={s.drawerList}>
        {upcoming.map((tr, k) => (
          <button
            key={`${tr.id}-${k}`}
            type="button"
            className={cx(s.queueRow, k === 0 && s.queueCurrent)}
            aria-current={k === 0 || undefined}
            onClick={() => player.jump(st.index + k)}
          >
            <Cover album={tr.album} size={40} />
            <span className={s.meta}>
              <span className={s.title}>{tr.title}</span>
              <span className={s.artists}>{tr.artists.map((a) => a.name).join(', ')}</span>
            </span>
            <span className={s.time}>{formatDuration(tr.duration_ms)}</span>
          </button>
        ))}
      </div>
      {st.wave && <p className={s.drawerNote}>{t('player.queue_wave')}</p>}
    </aside>,
    document.body,
  );
}