import React, { useCallback, useMemo, useState } from 'react';
import { createPortal } from 'react-dom';
import {
  Play, Pause, SkipBack, SkipForward, Volume2, VolumeX, Music,
  Square, Repeat, Repeat1, Maximize2, SlidersHorizontal, X, Heart, MicVocal
} from 'lucide-react';
import { usePlayerStore } from '../store/playerStore';
import { useAuthStore } from '../store/authStore';
import { buildCoverArtUrl, coverArtCacheKey } from '../api/subsonic';
import CachedImage from './CachedImage';
import WaveformSeek from './WaveformSeek';
import Equalizer from './Equalizer';
import { useTranslation } from 'react-i18next';
import { useNavigate } from 'react-router-dom';
import { useLyricsStore } from '../store/lyricsStore';

function formatTime(seconds: number): string {
  if (!seconds || isNaN(seconds)) return '0:00';
  const m = Math.floor(seconds / 60);
  const s = Math.floor(seconds % 60);
  return `${m}:${s.toString().padStart(2, '0')}`;
}

export default function PlayerBar() {
  const { t } = useTranslation();
  const navigate = useNavigate();
  const [eqOpen, setEqOpen] = useState(false);
  const showLyrics   = useLyricsStore(s => s.showLyrics);
  const activeTab    = useLyricsStore(s => s.activeTab);
  const {
    currentTrack, isPlaying, currentTime, volume,
    togglePlay, next, previous, setVolume,
    stop, toggleRepeat, repeatMode, toggleFullscreen,
    lastfmLoved, toggleLastfmLove,
    isQueueVisible, toggleQueue,
  } = usePlayerStore();
  const { lastfmSessionKey } = useAuthStore();

  const duration = currentTrack?.duration ?? 0;
  const coverSrc = useMemo(() => currentTrack?.coverArt ? buildCoverArtUrl(currentTrack.coverArt, 128) : '', [currentTrack?.coverArt]);
  const coverKey = currentTrack?.coverArt ? coverArtCacheKey(currentTrack.coverArt, 128) : '';

  const handleVolume = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
    setVolume(parseFloat(e.target.value));
  }, [setVolume]);

  const volumeStyle = {
    background: `linear-gradient(to right, var(--volume-accent, var(--accent)) ${volume * 100}%, var(--ctp-surface2) ${volume * 100}%)`,
  };

  return (
    <footer className="player-bar" role="region" aria-label={t('player.regionLabel')}>

      {/* Track Info */}
      <div className="player-track-info">
        <div
          className={`player-album-art-wrap ${currentTrack ? 'clickable' : ''}`}
          onClick={() => currentTrack && toggleFullscreen()}
          data-tooltip={currentTrack ? t('player.openFullscreen') : undefined}
        >
          {currentTrack?.coverArt ? (
            <CachedImage
              className="player-album-art"
              src={coverSrc}
              cacheKey={coverKey}
              alt={`${currentTrack.album} Cover`}
            />
          ) : (
            <div className="player-album-art-placeholder">
              <Music size={22} />
            </div>
          )}
          {currentTrack && (
            <div className="player-art-expand-hint" aria-hidden="true">
              <Maximize2 size={16} />
            </div>
          )}
        </div>
        <div className="player-track-meta">
          <div
            className="player-track-name"
            style={{ cursor: currentTrack?.albumId ? 'pointer' : 'default' }}
            onClick={() => currentTrack?.albumId && navigate(`/album/${currentTrack.albumId}`)}
          >
            {currentTrack?.title ?? t('player.noTitle')}
          </div>
          <div
            className="player-track-artist"
            style={{ cursor: currentTrack?.artistId ? 'pointer' : 'default' }}
            onClick={() => currentTrack?.artistId && navigate(`/artist/${currentTrack.artistId}`)}
          >
            {currentTrack?.artist ?? '—'}
          </div>
        </div>
        {currentTrack && lastfmSessionKey && (
          <button
            className="player-btn player-btn-sm player-love-btn"
            onClick={toggleLastfmLove}
            aria-label={lastfmLoved ? t('contextMenu.lfmUnlove') : t('contextMenu.lfmLove')}
            data-tooltip={lastfmLoved ? t('contextMenu.lfmUnlove') : t('contextMenu.lfmLove')}
            style={{ color: lastfmLoved ? '#e31c23' : 'var(--text-muted)', flexShrink: 0 }}
          >
            <Heart size={15} fill={lastfmLoved ? '#e31c23' : 'none'} />
          </button>
        )}
      </div>

      {/* Transport Controls */}
      <div className="player-buttons">
        <button className="player-btn player-btn-sm" onClick={stop} aria-label={t('player.stop')} data-tooltip={t('player.stop')}>
          <Square size={14} fill="currentColor" />
        </button>
        <button className="player-btn" onClick={previous} aria-label={t('player.prev')} data-tooltip={t('player.prev')}>
          <SkipBack size={19} />
        </button>
        <button
          className="player-btn player-btn-primary"
          onClick={togglePlay}
          aria-label={isPlaying ? t('player.pause') : t('player.play')}
          data-tooltip={isPlaying ? t('player.pause') : t('player.play')}
        >
          {isPlaying ? <Pause size={22} fill="currentColor" /> : <Play size={22} fill="currentColor" />}
        </button>
        <button className="player-btn" onClick={next} aria-label={t('player.next')} data-tooltip={t('player.next')}>
          <SkipForward size={19} />
        </button>
        <button
          className="player-btn player-btn-sm"
          onClick={toggleRepeat}
          aria-label={t('player.repeat')}
          data-tooltip={`${t('player.repeat')}: ${repeatMode === 'off' ? t('player.repeatOff') : repeatMode === 'all' ? t('player.repeatAll') : t('player.repeatOne')}`}
          style={{ color: repeatMode !== 'off' ? 'var(--accent)' : undefined }}
        >
          {repeatMode === 'one' ? <Repeat1 size={14} /> : <Repeat size={14} />}
        </button>
      </div>

      {/* Waveform Seekbar */}
      <div className="player-waveform-section">
        <span className="player-time">{formatTime(currentTime)}</span>
        <div className="player-waveform-wrap">
          <WaveformSeek trackId={currentTrack?.id} />
        </div>
        <span className="player-time">{formatTime(duration)}</span>
      </div>

      {/* Lyrics Button */}
      <button
        className={`player-btn player-btn-sm ${activeTab === 'lyrics' && isQueueVisible ? 'active' : ''}`}
        onClick={() => { if (!isQueueVisible) toggleQueue(); showLyrics(); }}
        aria-label={t('player.lyrics')}
        data-tooltip={t('player.lyrics')}
      >
        <MicVocal size={15} />
      </button>

      {/* EQ Button */}
      <button
        className={`player-btn player-btn-sm player-eq-btn ${eqOpen ? 'active' : ''}`}
        onClick={() => setEqOpen(v => !v)}
        aria-label="Equalizer"
        data-tooltip="Equalizer"
      >
        <SlidersHorizontal size={15} />
      </button>

      {/* Volume */}
      <div className="player-volume-section">
        <button
          className="player-btn player-btn-sm"
          onClick={() => setVolume(volume === 0 ? 0.7 : 0)}
          aria-label={t('player.volume')}
          style={{ color: 'var(--text-muted)', flexShrink: 0 }}
        >
          {volume === 0 ? <VolumeX size={16} /> : <Volume2 size={16} />}
        </button>
        <input
          type="range"
          id="player-volume"
          min={0}
          max={1}
          step={0.01}
          value={volume}
          onChange={handleVolume}
          style={volumeStyle}
          aria-label={t('player.volume')}
          className="player-volume-slider"
        />
      </div>

      {/* EQ Popup — rendered via portal to avoid backdrop-filter containing-block issue */}
      {eqOpen && createPortal(
        <>
          <div className="eq-popup-backdrop" onClick={() => setEqOpen(false)} />
          <div className="eq-popup">
            <div className="eq-popup-header">
              <span className="eq-popup-title">Equalizer</span>
              <button className="eq-popup-close" onClick={() => setEqOpen(false)} aria-label="Close">
                <X size={16} />
              </button>
            </div>
            <Equalizer />
          </div>
        </>,
        document.body
      )}

    </footer>
  );
}