import React, { useState } from 'react';
import { useAudio } from '../../../context/AudioContext';
import { Card } from '../../ui/card';
import { Button } from '../../ui/button';
import { SaveQueueAsPlaylistModal } from './SaveQueueAsPlaylistModal';
import {
  Play,
  Pause,
  X,
  GripVertical,
  Trash2,
  Save,
  ListMusic,
} from 'lucide-react';
import { useToast } from '../../../components/feedback/ToastProvider';

export const QueueView: React.FC = () => {
  const {
    queue,
    currentTrack,
    reorderQueue,
    removeFromQueue,
    clearQueue,
    playTrack,
    isPlaying,
    togglePlay,
    autoplay,
    toggleAutoplay,
  } = useAudio();
  const { addToast } = useToast();
  const [showSaveModal, setShowSaveModal] = useState(false);
  const [draggedIndex, setDraggedIndex] = useState<number | null>(null);

  const handleDragStart = (e: React.DragEvent, index: number) => {
    setDraggedIndex(index);
    e.dataTransfer.effectAllowed = 'move';
    // Transparent ghost image
    const ghost = document.createElement('div');
    ghost.style.opacity = '0';
    document.body.appendChild(ghost);
    e.dataTransfer.setDragImage(ghost, 0, 0);
    setTimeout(() => document.body.removeChild(ghost), 0);
  };

  const handleDragOver = (e: React.DragEvent, index: number) => {
    e.preventDefault();
    if (draggedIndex === null || draggedIndex === index) return;
    reorderQueue(draggedIndex, index);
    setDraggedIndex(index);
  };

  const handleSavePlaylist = (name: string, _isPublic: boolean) => {
    addToast(`Queue saved as "${name}"`, 'success');
    // Logic to actually save would connect to backend/context here
  };

  return (
    <div className="max-w-4xl mx-auto space-y-6 animate-fadeIn pb-20">
      <div className="flex flex-col md:flex-row justify-between items-end border-b border-border/50 pb-6 gap-4">
        <div>
          <h1 className="text-3xl font-display font-bold text-white mb-2">
            PLAY QUEUE
          </h1>
          <p className="text-muted-foreground font-mono text-sm">
            {queue.length} tracks upcoming
          </p>
        </div>
        <div className="flex gap-4">
          <Button
            variant="ghost"
            onClick={() => setShowSaveModal(true)}
            icon={<Save className="w-4 h-4" />}
          >
            Save Queue
          </Button>
          <Button
            variant="ghost"
            className="text-destructive hover:bg-destructive/10"
            onClick={clearQueue}
            icon={<Trash2 className="w-4 h-4" />}
          >
            Clear
          </Button>
        </div>
      </div>

      {/* Current Track */}
      {currentTrack && (
        <div>
          <h3 className="text-xs font-bold text-muted-foreground uppercase tracking-widest mb-3">
            Now Playing
          </h3>
          <Card
            variant="glass"
            className="flex items-center gap-4 p-4 border-l-4 border-l-kodo-cyan"
          >
            <div
              className="relative w-16 h-16 rounded overflow-hidden flex-shrink-0 group cursor-pointer"
              onClick={togglePlay}
            >
              <img
                src={currentTrack.coverUrl}
                className="w-full h-full object-cover"
              />
              <div className="absolute inset-0 bg-black/40 flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity">
                {isPlaying ? (
                  <Pause className="w-6 h-6 text-white" />
                ) : (
                  <Play className="w-6 h-6 text-white fill-current ml-1" />
                )}
              </div>
              {isPlaying && (
                <div className="absolute bottom-1 right-1 flex gap-0.5 items-end h-3">
                  <div className="w-1 bg-primary animate-[bounce_1s_infinite] h-full"></div>
                  <div className="w-1 bg-primary animate-[bounce_1.2s_infinite] h-2/3"></div>
                  <div className="w-1 bg-primary animate-[bounce_0.8s_infinite] h-full"></div>
                </div>
              )}
            </div>
            <div className="flex-1">
              <h2 className="text-xl font-bold text-white">
                {currentTrack.title}
              </h2>
              <p className="text-kodo-steel">{currentTrack.artist}</p>
            </div>
            <div className="text-muted-foreground font-mono text-sm hidden md:block">
              {currentTrack.duration}
            </div>
          </Card>
        </div>
      )}

      {/* Up Next */}
      <div>
        <div className="flex justify-between items-center mb-3">
          <h3 className="text-xs font-bold text-muted-foreground uppercase tracking-widest">
            Up Next
          </h3>
          <div
            className="flex items-center gap-2 cursor-pointer group"
            onClick={toggleAutoplay}
          >
            <span
              className={`text-xs font-bold ${autoplay ? 'text-success' : 'text-muted-foreground'}`}
            >
              Autoplay
            </span>
            <div
              className={`w-8 h-4 rounded-full relative transition-colors ${autoplay ? 'bg-success' : 'bg-muted'}`}
            >
              <div
                className={`absolute top-0.5 w-3 h-3 bg-white rounded-full transition-all ${autoplay ? 'left-4.5' : 'left-0.5'}`}
              ></div>
            </div>
          </div>
        </div>

        <div className="space-y-2">
          {queue.length === 0 ? (
            <div className="text-center py-12 border-2 border-dashed border-border rounded-xl text-muted-foreground">
              <ListMusic className="w-12 h-12 mx-auto mb-4 opacity-50" />
              <p className="text-sm">
                Queue is empty. Add tracks to keep the vibe going.
              </p>
              {autoplay && (
                <p className="text-xs text-success mt-2">
                  Autoplay is on. We'll pick a song for you.
                </p>
              )}
            </div>
          ) : (
            queue.map((track, i) => (
              <div
                key={`${track.id}-${i}`}
                draggable
                onDragStart={(e) => handleDragStart(e, i)}
                onDragOver={(e) => handleDragOver(e, i)}
                onDragEnd={() => setDraggedIndex(null)}
                className={`flex items-center gap-4 p-4 bg-kodo-ink rounded-lg border border-transparent hover:border-border transition-all group ${draggedIndex === i ? 'opacity-50 border-primary' : ''}`}
              >
                <div className="text-muted-foreground cursor-grab active:cursor-grabbing hover:text-white p-1">
                  <GripVertical className="w-5 h-5" />
                </div>
                <div className="w-10 h-10 rounded overflow-hidden flex-shrink-0 relative">
                  <img
                    src={track.coverUrl}
                    className="w-full h-full object-cover"
                  />
                  <div
                    className="absolute inset-0 bg-black/50 hidden group-hover:flex items-center justify-center cursor-pointer"
                    onClick={() => playTrack(track)}
                  >
                    <Play className="w-4 h-4 text-white fill-current" />
                  </div>
                </div>
                <div className="flex-1 min-w-0">
                  <div className="text-sm font-bold text-white truncate">
                    {track.title}
                  </div>
                  <div className="text-xs text-muted-foreground truncate">
                    {track.artist}
                  </div>
                </div>
                <div className="text-muted-foreground font-mono text-xs hidden sm:block">
                  {track.duration}
                </div>
                <button
                  className="p-2 text-muted-foreground hover:text-destructive opacity-0 group-hover:opacity-100 transition-opacity"
                  onClick={() => removeFromQueue(track.id)}
                >
                  <X className="w-4 h-4" />
                </button>
              </div>
            ))
          )}
        </div>
      </div>

      {showSaveModal && (
        <SaveQueueAsPlaylistModal
          onClose={() => setShowSaveModal(false)}
          onSave={handleSavePlaylist}
        />
      )}
    </div>
  );
};