import React, { useState, useEffect } from 'react';
import { 
  Plus, 
  Settings, 
  Users, 
  BarChart, 
  Trash2, 
  Edit2, 
  X, 
  MessageSquare, 
  Send, 
  Image as ImageIcon, 
  Video, 
  Loader2, 
  FileText, 
  FileSpreadsheet,
  FileArchive,
  Link as LinkIcon, 
  Paperclip, 
  Lightbulb, 
  ListVideo, 
  Check, 
  Lock, 
  Unlock, 
  Globe,
  Download
  ,Copy, ChevronUp, ChevronDown
} from 'lucide-react';
import { Course, Comment, Attachment, Lesson, AttachmentType, LessonMedia } from '../types';
import { useToast } from '../context/ToastContext';
import { getManagedCourses, saveCourse, deleteCourse, duplicateCourse, getComments, replyToComment, moderateComment } from '../services/db';
import { getAttachmentIcon, getAttachmentBadge } from '../components/MaterialCard';
import { BunnyVideo, courseApi, instructorApi, InstructorAnalytics } from '../services/api';

// 1. Create/Edit Course Modal
const CourseModal: React.FC<{
  isOpen: boolean;
  onClose: () => void;
  onSave: (course: Course) => Promise<void>;
  initialData?: Course;
}> = ({ isOpen, onClose, onSave, initialData }) => {
  const [title, setTitle] = useState('');
  const [description, setDescription] = useState('');
  const [category, setCategory] = useState('');
  const [status, setStatus] = useState<Course['status']>('draft');
  const [thumbnailPreview, setThumbnailPreview] = useState<string>('');
  const [categories, setCategories] = useState<string[]>([]);
  
  // Lesson Management
  const [lessons, setLessons] = useState<Lesson[]>([]);
  
  // New Lesson State
  const [newLessonTitle, setNewLessonTitle] = useState('');
  const [newLessonDuration, setNewLessonDuration] = useState('');
  const [newLessonVideoUrl, setNewLessonVideoUrl] = useState('');
  const [newLessonProvider, setNewLessonProvider] = useState('external');
  const [newLessonMedia, setNewLessonMedia] = useState<LessonMedia | null>(null);
  const [newLessonIsFree, setNewLessonIsFree] = useState(false);
  const [bunnyConfigured, setBunnyConfigured] = useState<boolean | null>(null);
  const [bunnyUploadState, setBunnyUploadState] = useState<'idle' | 'uploading' | 'uploaded' | 'error'>('idle');
  const [bunnyUploadMessage, setBunnyUploadMessage] = useState('');

  // Tips & Global Attachments
  const [tips, setTips] = useState<string[]>([]);
  const [newTip, setNewTip] = useState('');
  const [attachments, setAttachments] = useState<Attachment[]>([]);
  
  // New Attachment State
  const [newAttName, setNewAttName] = useState('');
  const [newAttType, setNewAttType] = useState<AttachmentType>('pdf');
  const [newAttUrl, setNewAttUrl] = useState('');
  const [newAttSize, setNewAttSize] = useState('');
  const [newAttDesc, setNewAttDesc] = useState('');
  
  const [isSubmitting, setIsSubmitting] = useState(false);

  useEffect(() => {
    if (isOpen) {
      if (initialData) {
        setTitle(initialData.title);
        setDescription(initialData.description);
        setCategory(initialData.category);
        setStatus(initialData.status || 'published');
        setThumbnailPreview(initialData.thumbnail);
        setTips(initialData.tips || []);
        setAttachments(initialData.attachments || []);
        setLessons(initialData.lessons || []);
      } else {
        setTitle('');
        setDescription('');
        setCategory('');
        setStatus('draft');
        setThumbnailPreview('');
        setTips([]);
        setAttachments([]);
        setLessons([]);
      }
      setNewLessonMedia(null);
      setBunnyUploadState('idle');
      setBunnyUploadMessage('');
      instructorApi.bunnyConfiguration()
        .then((response) => setBunnyConfigured(response.data.configured))
        .catch(() => setBunnyConfigured(false));
      courseApi.categories()
        .then((response) => {
          setCategories(response.data);
          if (!initialData) setCategory((current) => current || response.data[0] || '');
        })
        .catch(() => setCategories([]));
    }
  }, [isOpen, initialData]);

  const toBunnyMedia = (video: BunnyVideo): LessonMedia => ({
    provider: 'bunny',
    externalId: video.id,
    status: video.status,
    durationSeconds: video.durationSeconds,
  });

  const handleBunnyUpload = async (event: React.ChangeEvent<HTMLInputElement>) => {
    const file = event.target.files?.[0];
    event.target.value = '';
    if (!file) return;
    if (!newLessonTitle.trim()) {
      alert('Informe o título da aula antes de enviar o vídeo.');
      return;
    }
    if (!bunnyConfigured) {
      alert('A integração com Bunny Stream ainda não foi configurada pelo administrador.');
      return;
    }

    setBunnyUploadState('uploading');
    setBunnyUploadMessage(`Enviando ${file.name} para Bunny Stream...`);
    try {
      const created = await instructorApi.createBunnyVideo(newLessonTitle.trim());
      const uploaded = await instructorApi.uploadBunnyVideo(created.data.id, file);
      const media = toBunnyMedia(uploaded.data);
      setNewLessonMedia(media);
      if (!newLessonDuration.trim() && uploaded.data.durationSeconds) {
        const minutes = Math.max(1, Math.round(uploaded.data.durationSeconds / 60));
        setNewLessonDuration(`${minutes}m`);
      }
      setBunnyUploadState('uploaded');
      setBunnyUploadMessage(uploaded.data.status === 'ready'
        ? 'Vídeo pronto para ser adicionado à aula.'
        : 'Upload concluído. Bunny Stream está processando o vídeo; você já pode salvar a aula.');
    } catch (error) {
      setBunnyUploadState('error');
      setBunnyUploadMessage(error instanceof Error ? error.message : 'Não foi possível enviar o vídeo para Bunny Stream.');
    }
  };

  const refreshLessonMedia = async (lessonId: string) => {
    const lesson = lessons.find((item) => item.id === lessonId);
    const media = lesson?.media?.[0];
    if (!lesson || !media || media.provider !== 'bunny') return;
    try {
      const response = await instructorApi.bunnyVideoStatus(media.externalId);
      const refreshed = toBunnyMedia(response.data);
      setLessons((current) => current.map((item) => item.id === lessonId ? {
        ...item,
        duration: refreshed.durationSeconds ? `${Math.max(1, Math.round(refreshed.durationSeconds / 60))}m` : item.duration,
        media: [refreshed],
      } : item));
    } catch (error) {
      alert(error instanceof Error ? error.message : 'Não foi possível atualizar o status do vídeo.');
    }
  };

  // Bunny encodes asynchronously. While the course editor stays open, keep
  // pending lessons up to date and persist the latest state on the API.
  useEffect(() => {
    if (!isOpen) return;
    const pending = lessons
      .map((lesson) => ({ lesson, media: lesson.media?.[0] }))
      .filter((item): item is { lesson: Lesson; media: LessonMedia } => item.media?.provider === 'bunny' && item.media.status === 'processing');
    if (!pending.length) return;

    const timer = window.setTimeout(() => {
      Promise.all(pending.map(async ({ lesson, media }) => {
        try {
          const response = await instructorApi.bunnyVideoStatus(media.externalId);
          return { lessonId: lesson.id, media: toBunnyMedia(response.data) };
        } catch {
          return null;
        }
      })).then((updates) => {
        const available = updates.filter((update): update is { lessonId: string; media: LessonMedia } => Boolean(update));
        if (!available.length) return;
        setLessons((current) => current.map((lesson) => {
          const update = available.find((item) => item.lessonId === lesson.id);
          if (!update) return lesson;
          return {
            ...lesson,
            duration: update.media.durationSeconds ? `${Math.max(1, Math.round(update.media.durationSeconds / 60))}m` : lesson.duration,
            media: [update.media],
          };
        }));
      });
    }, 10_000);
    return () => window.clearTimeout(timer);
  }, [isOpen, lessons]);

  const handleAddLesson = () => {
    if (!newLessonTitle.trim()) {
      alert("Digite um título para a aula.");
      return;
    }
    if (!newLessonMedia && !newLessonVideoUrl.trim()) {
      alert('Envie um vídeo para Bunny Stream ou informe uma URL de vídeo hospedado.');
      return;
    }

    const newLesson: Lesson = {
      id: `lesson-${Date.now()}`,
      title: newLessonTitle,
      duration: newLessonDuration || '15m',
      videoUrl: newLessonMedia?.playbackUrl || newLessonVideoUrl,
      mediaProvider: newLessonMedia?.provider || newLessonProvider || 'external',
      media: newLessonMedia ? [newLessonMedia] : undefined,
      isFree: newLessonIsFree,
      description: ''
    };

    setLessons([...lessons, newLesson]);
    
    setNewLessonTitle('');
    setNewLessonDuration('');
    setNewLessonVideoUrl('');
    setNewLessonProvider('external');
    setNewLessonMedia(null);
    setNewLessonIsFree(false);
    setBunnyUploadState('idle');
    setBunnyUploadMessage('');
  };

  const removeLesson = (id: string) => {
    setLessons(lessons.filter(l => l.id !== id));
  };

  const toggleLessonAccess = (id: string) => {
    setLessons(lessons.map(l => l.id === id ? { ...l, isFree: !l.isFree } : l));
  };

  const moveLesson = (id: string, direction: -1 | 1) => {
    setLessons((current) => {
      const index = current.findIndex((lesson) => lesson.id === id);
      const nextIndex = index + direction;
      if (index < 0 || nextIndex < 0 || nextIndex >= current.length) return current;
      const next = [...current];
      [next[index], next[nextIndex]] = [next[nextIndex], next[index]];
      return next;
    });
  };

  const handleAddTip = () => {
    if (newTip.trim()) {
      setTips([...tips, newTip.trim()]);
      setNewTip('');
    }
  };

  const removeTip = (idx: number) => {
    setTips(tips.filter((_, i) => i !== idx));
  };

  const handleAddAttachment = () => {
    if (!newAttName.trim()) {
      alert("Informe o nome do arquivo para download.");
      return;
    }

    const att: Attachment = {
      id: `att-${Date.now()}`,
      name: newAttName.trim(),
      type: newAttType,
      url: newAttUrl.trim() || '#',
      size: newAttSize.trim() || '1.5 MB',
      description: newAttDesc.trim()
    };

    setAttachments([...attachments, att]);
    setNewAttName('');
    setNewAttSize('');
    setNewAttUrl('');
    setNewAttDesc('');
  };

  const removeAttachment = (id: string) => {
    setAttachments(attachments.filter(a => a.id !== id));
  };

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault();
    if (lessons.length === 0) {
      alert("Adicione pelo menos uma aula à trilha.");
      return;
    }

    setIsSubmitting(true);
    
    const durationStr = `${lessons.length} Aulas`; 

    try {
      await onSave({
        id: initialData?.id || `course-${Date.now()}`,
        title,
        description,
        category: category || categories[0],
        status,
        thumbnail: thumbnailPreview || '/course-placeholder.svg',
        duration: durationStr,
        instructor: initialData?.instructor || '',
        views: initialData?.views || 0,
        progress: initialData?.progress || 0,
        lessons: lessons,
        tips: tips,
        attachments: attachments
      });
      onClose();
    } catch (error) {
      alert(error instanceof Error ? error.message : 'Não foi possível salvar este curso.');
    } finally {
      setIsSubmitting(false);
    }
  };

  if (!isOpen) return null;

  return (
    <div className="fixed inset-0 z-[100] flex items-center justify-center p-4">
      <div className="absolute inset-0 bg-black/80 backdrop-blur-xl" onClick={onClose} />
      <div className="relative w-full max-w-6xl bg-[#141416] rounded-3xl border border-white/10 p-6 md:p-8 shadow-2xl animate-fade-in-up max-h-[92vh] overflow-y-auto flex flex-col lg:flex-row gap-8">
        
        {/* Left Column: Course Details, Tips & Downloads */}
        <div className="w-full lg:w-5/12 space-y-6">
          <div className="flex justify-between items-center lg:hidden mb-2">
            <h2 className="text-xl font-bold text-white">{initialData ? 'Editar Curso' : 'Criar Curso'}</h2>
            <button onClick={onClose}><X className="text-white" /></button>
          </div>

          {/* Thumbnail */}
          <div>
            <label className="text-xs text-gray-400 uppercase font-bold tracking-wider mb-2 block">Imagem de Capa (16:9)</label>
            <div 
              className="w-full aspect-video rounded-2xl border-2 border-dashed border-white/10 bg-black/40 flex flex-col items-center justify-center cursor-pointer hover:border-orange-500/50 transition-colors relative overflow-hidden group"
            >
              {thumbnailPreview ? (
                <>
                  <img src={thumbnailPreview} alt="Preview" className="w-full h-full object-cover opacity-70 group-hover:opacity-40 transition-opacity" />
                  <div className="absolute inset-0 flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity">
                    <span className="bg-orange-500 px-4 py-2 rounded-xl text-xs font-bold shadow-lg">Alterar Capa</span>
                  </div>
                </>
              ) : (
                <div className="text-center p-6">
                  <ImageIcon className="w-10 h-10 text-orange-400/60 mx-auto mb-2" />
                  <p className="text-gray-300 text-xs font-medium">Add a hosted cover image URL below</p>
                </div>
              )}
            </div>
            <input
              type="url"
              value={thumbnailPreview}
              onChange={(event) => setThumbnailPreview(event.target.value)}
              placeholder="Hosted cover image URL"
              className="w-full mt-2 bg-black/50 text-white text-xs border border-white/10 rounded-xl px-4 py-3 focus:outline-none focus:border-orange-500/50"
            />
          </div>

          <div className="space-y-4">
            <div>
              <label className="text-xs text-gray-400 uppercase font-bold tracking-wider mb-1 block">Título do Curso</label>
              <input
                type="text"
                value={title}
                onChange={(e) => setTitle(e.target.value)}
                placeholder="Ex: Masterclass: Escala de Tráfego Pago"
                className="w-full bg-black/50 text-white text-base font-bold border border-white/10 rounded-xl px-4 py-3 focus:outline-none focus:border-orange-500/50"
                required
              />
            </div>

            <div className="grid grid-cols-2 gap-3">
              <div>
                <label className="text-xs text-gray-400 uppercase font-bold tracking-wider mb-1 block">Categoria</label>
                <select
                  value={category}
                  onChange={(e) => setCategory(e.target.value)}
                  className="w-full bg-black/50 text-white border border-white/10 rounded-xl px-3 py-2.5 text-xs focus:outline-none focus:border-orange-500/50"
                >
                  {categories.map(cat => (
                    <option key={cat} value={cat} className="bg-zinc-900">{cat}</option>
                  ))}
                </select>
              </div>

              <div>
                <label className="text-xs text-gray-400 uppercase font-bold tracking-wider mb-1 block">Publicação</label>
                <select value={status} onChange={(e) => setStatus(e.target.value as Course['status'])} className="w-full bg-black/50 text-white border border-white/10 rounded-xl px-3 py-2.5 text-xs focus:outline-none focus:border-orange-500/50">
                  <option value="draft" className="bg-zinc-900">Salvar como rascunho</option>
                  <option value="published" className="bg-zinc-900">Publicar agora</option>
                </select>
              </div>

            </div>

            <div>
              <label className="text-xs text-gray-400 uppercase font-bold tracking-wider mb-1 block">Descrição do Curso</label>
              <textarea
                value={description}
                onChange={(e) => setDescription(e.target.value)}
                rows={3}
                placeholder="O que os alunos vão aprender e dominar neste curso?"
                className="w-full bg-black/50 text-white border border-white/10 rounded-xl px-4 py-2.5 text-xs focus:outline-none focus:border-orange-500/50 resize-none leading-relaxed"
              />
            </div>
          </div>

          {/* Downloadable Materials Section */}
          <div className="bg-black/40 p-4 rounded-2xl border border-white/10 space-y-3">
            <div className="flex items-center justify-between">
              <h3 className="text-xs font-bold text-orange-400 uppercase tracking-wider flex items-center gap-1.5">
                <Download className="w-4 h-4" />
                Materiais Complementares ({attachments.length})
              </h3>
            </div>

            {/* Add attachment inputs */}
            <div className="space-y-2 pt-1">
              <div className="grid grid-cols-3 gap-2">
                <input 
                  type="text" 
                  value={newAttName}
                  onChange={(e) => setNewAttName(e.target.value)}
                  placeholder="Nome do arquivo (ex: Planilha_ROAS.xlsx)"
                  className="col-span-2 bg-white/5 border border-white/10 rounded-lg px-2.5 py-1.5 text-xs text-white focus:outline-none focus:border-orange-500/50"
                />
                <select
                  value={newAttType}
                  onChange={(e) => setNewAttType(e.target.value as AttachmentType)}
                  className="bg-zinc-900 border border-white/10 rounded-lg px-2 py-1.5 text-xs text-white focus:outline-none"
                >
                  <option value="pdf">PDF</option>
                  <option value="spreadsheet">Planilha</option>
                  <option value="zip">Pacote ZIP</option>
                  <option value="doc">Documento</option>
                  <option value="link">Link</option>
                </select>
              </div>

              <div className="flex gap-2">
                <input 
                  type="text" 
                  value={newAttSize}
                  onChange={(e) => setNewAttSize(e.target.value)}
                  placeholder="Tamanho (ex: 2.4 MB)"
                  className="w-28 bg-white/5 border border-white/10 rounded-lg px-2.5 py-1.5 text-xs text-white focus:outline-none"
                />
                <input 
                  type="text" 
                  value={newAttDesc}
                  onChange={(e) => setNewAttDesc(e.target.value)}
                  placeholder="Breve descrição do material..."
                  className="flex-1 bg-white/5 border border-white/10 rounded-lg px-2.5 py-1.5 text-xs text-white focus:outline-none"
                />
                <button 
                  type="button" 
                  onClick={handleAddAttachment}
                  className="bg-orange-500 hover:bg-orange-600 px-3 py-1.5 rounded-lg text-white text-xs font-bold shrink-0 transition-colors"
                >
                  Adicionar
                </button>
              </div>
            </div>

            {/* List of Attachments */}
            <div className="space-y-1.5 max-h-36 overflow-y-auto pr-1 pt-1">
              {attachments.map((att) => (
                <div key={att.id} className="flex items-center justify-between p-2 rounded-lg bg-white/5 border border-white/5 text-xs">
                  <div className="flex items-center gap-2 min-w-0 pr-2">
                    {getAttachmentIcon(att.type)}
                    <span className="text-gray-200 font-medium truncate">{att.name}</span>
                    <span className="text-[10px] text-gray-500 font-mono">({att.size || '1 MB'})</span>
                  </div>
                  <button 
                    type="button" 
                    onClick={() => removeAttachment(att.id)}
                    className="text-gray-500 hover:text-red-400 p-1"
                  >
                    <Trash2 className="w-3.5 h-3.5" />
                  </button>
                </div>
              ))}
            </div>
          </div>
        </div>

        {/* Right Column: Lessons Builder */}
        <div className="flex-1 flex flex-col justify-between">
          <div>
            <div className="hidden lg:flex justify-between items-center mb-6">
              <h2 className="text-2xl font-extrabold text-white">
                {initialData ? 'Gerenciar Trilha & Aulas' : 'Estruturar Grade de Aulas'}
              </h2>
              <button onClick={onClose} className="p-2 bg-white/5 rounded-full hover:bg-white/20 transition-colors">
                <X className="w-5 h-5 text-white" />
              </button>
            </div>

            <div className="bg-black/50 rounded-2xl border border-white/10 overflow-hidden mb-6">
              <div className="p-4 border-b border-white/5 bg-zinc-900/50 flex items-center justify-between">
                <div className="flex items-center gap-2">
                  <ListVideo className="w-4 h-4 text-orange-400" />
                  <h3 className="font-bold text-white text-sm">Grade do Curso</h3>
                </div>
                <span className="bg-orange-500/10 text-orange-400 border border-orange-500/20 px-3 py-0.5 rounded-full text-xs font-bold">
                  {lessons.length} Aulas
                </span>
              </div>

              {/* Lesson List */}
              <div className="overflow-y-auto p-4 space-y-2.5 max-h-[300px]">
                {lessons.length === 0 && (
                  <div className="flex flex-col items-center justify-center py-10 text-gray-500 space-y-2">
                    <ListVideo className="w-8 h-8 opacity-20 text-orange-400" />
                    <p className="text-xs">Nenhuma aula cadastrada ainda. Adicione abaixo.</p>
                  </div>
                )}
                {lessons.map((lesson, index) => (
                  <div key={lesson.id} className="flex items-center gap-3 bg-white/[0.04] p-3 rounded-xl border border-white/5 group hover:border-orange-500/30 transition-all">
                    <div className="flex items-center justify-center w-6 h-6 rounded-lg bg-white/10 text-gray-400 font-mono text-xs font-bold">
                      {index + 1}
                    </div>
                    
                    <div className="flex-1 min-w-0">
                      <h4 className="text-white font-medium text-xs md:text-sm truncate">{lesson.title}</h4>
                      <div className="flex items-center gap-2 text-[11px] text-gray-500 mt-0.5">
                        <span className="flex items-center gap-1"><Video className="w-3 h-3 text-orange-400/70"/> {lesson.duration}</span>
                        {lesson.media?.[0]?.provider === 'bunny' && (
                          <span className={`font-bold px-1.5 py-0.2 rounded text-[9px] uppercase ${lesson.media[0].status === 'ready' ? 'text-emerald-400 bg-emerald-500/10' : lesson.media[0].status === 'failed' ? 'text-red-400 bg-red-500/10' : 'text-amber-400 bg-amber-500/10'}`}>
                            Bunny: {lesson.media[0].status === 'ready' ? 'pronto' : lesson.media[0].status === 'failed' ? 'falhou' : 'processando'}
                          </span>
                        )}
                        {lesson.isFree ? (
                          <span className="text-emerald-400 font-bold bg-emerald-500/10 px-1.5 py-0.2 rounded text-[9px] uppercase">GRÁTIS</span>
                        ) : (
                          <span className="text-purple-400 font-bold bg-purple-500/10 px-1.5 py-0.2 rounded text-[9px] uppercase">EXCLUSIVA</span>
                        )}
                      </div>
                    </div>

                    <div className="flex items-center gap-1">
                      <button type="button" disabled={index === 0} onClick={() => moveLesson(lesson.id, -1)} className="p-1 text-gray-400 hover:text-white disabled:opacity-30" title="Mover aula para cima"><ChevronUp className="w-4 h-4" /></button>
                      <button type="button" disabled={index === lessons.length - 1} onClick={() => moveLesson(lesson.id, 1)} className="p-1 text-gray-400 hover:text-white disabled:opacity-30" title="Mover aula para baixo"><ChevronDown className="w-4 h-4" /></button>
                      {lesson.media?.[0]?.provider === 'bunny' && lesson.media[0].status !== 'ready' && (
                        <button
                          type="button"
                          onClick={() => refreshLessonMedia(lesson.id)}
                          className="px-2 py-1 text-[10px] text-orange-300 hover:bg-orange-500/10 rounded-lg transition-colors"
                          title="Atualizar status do vídeo"
                        >
                          Atualizar
                        </button>
                      )}
                      <button 
                        type="button"
                        onClick={() => toggleLessonAccess(lesson.id)}
                        className={`p-1.5 rounded-lg transition-colors ${lesson.isFree ? 'text-emerald-400 hover:bg-emerald-500/10' : 'text-purple-400 hover:bg-purple-500/10'}`}
                        title={lesson.isFree ? "Tornar Exclusiva para Membros" : "Tornar Grátis"}
                      >
                        {lesson.isFree ? <Unlock className="w-4 h-4" /> : <Lock className="w-4 h-4" />}
                      </button>
                      <button 
                        type="button"
                        onClick={() => removeLesson(lesson.id)}
                        className="p-1.5 text-gray-400 hover:text-red-400 hover:bg-red-500/10 rounded-lg transition-colors"
                      >
                        <Trash2 className="w-4 h-4" />
                      </button>
                    </div>
                  </div>
                ))}
              </div>

              {/* Add Lesson Form Box */}
              <div className="p-4 bg-zinc-950 border-t border-white/5 space-y-3">
                <h4 className="text-xs font-bold text-gray-400 uppercase tracking-wider flex items-center gap-1.5">
                  <Plus className="w-3.5 h-3.5 text-orange-400" />
                  Cadastrar Nova Aula
                </h4>
                
                <div className="flex gap-2">
                  <input 
                    type="text"
                    value={newLessonTitle}
                    onChange={(e) => setNewLessonTitle(e.target.value)}
                    placeholder="Título da Aula (ex: 01. Configuração do Pixel)"
                    className="flex-1 bg-white/5 border border-white/10 rounded-xl px-3 py-2 text-xs text-white focus:outline-none focus:border-orange-500/50"
                  />
                  <input 
                    type="text"
                    value={newLessonDuration}
                    onChange={(e) => setNewLessonDuration(e.target.value)}
                    placeholder="Duração (ex: 25m)"
                    className="w-28 bg-white/5 border border-white/10 rounded-xl px-3 py-2 text-xs text-white focus:outline-none focus:border-orange-500/50"
                  />
                </div>

                <div className="rounded-xl border border-orange-500/20 bg-orange-500/[0.04] p-3 space-y-2">
                  <div className="flex items-center justify-between gap-3">
                    <div>
                      <p className="text-xs font-bold text-orange-200">Vídeo Bunny Stream</p>
                      <p className="text-[11px] text-gray-500">O vídeo será protegido e reproduzido no player seguro da Bunny.</p>
                    </div>
                    <label className={`cursor-pointer rounded-lg px-3 py-2 text-xs font-bold transition-colors ${bunnyConfigured && bunnyUploadState !== 'uploading' ? 'bg-orange-500 hover:bg-orange-600 text-white' : 'bg-white/10 text-gray-500 cursor-not-allowed'}`}>
                      {bunnyUploadState === 'uploading' ? 'Enviando...' : 'Selecionar vídeo'}
                      <input
                        type="file"
                        accept="video/*"
                        className="hidden"
                        disabled={!bunnyConfigured || bunnyUploadState === 'uploading'}
                        onChange={handleBunnyUpload}
                      />
                    </label>
                  </div>
                  {bunnyConfigured === false && <p className="text-[11px] text-amber-300">Bunny Stream não está configurado no servidor. Peça ao administrador para adicionar as variáveis no Portainer.</p>}
                  {bunnyUploadMessage && <p className={`text-[11px] ${bunnyUploadState === 'error' ? 'text-red-300' : bunnyUploadState === 'uploaded' ? 'text-emerald-300' : 'text-gray-400'}`}>{bunnyUploadMessage}</p>}
                  {newLessonMedia && (
                    <div className="flex items-center justify-between rounded-lg bg-black/30 px-3 py-2 text-[11px] text-gray-300">
                      <span>Vídeo Bunny vinculado ({newLessonMedia.status === 'ready' ? 'pronto' : 'processando'})</span>
                      <button type="button" onClick={() => setNewLessonMedia(null)} className="text-gray-400 hover:text-red-300">Remover</button>
                    </div>
                  )}
                </div>

                <div className="flex gap-2 items-center pt-1">
                  <input
                    type="text"
                    value={newLessonProvider}
                    onChange={(event) => setNewLessonProvider(event.target.value)}
                    placeholder="Provider externo"
                    className="w-40 bg-white/5 border border-white/10 rounded-xl px-3 py-2 text-xs text-white focus:outline-none"
                  />
                  <input
                    type="url"
                    value={newLessonVideoUrl}
                    onChange={(event) => setNewLessonVideoUrl(event.target.value)}
                    placeholder="Ou cole uma URL externa de vídeo"
                    className="flex-1 bg-white/5 border border-white/10 rounded-xl px-3 py-2 text-xs text-white focus:outline-none"
                  />

                  <button 
                    type="button"
                    onClick={handleAddLesson}
                    className="bg-white hover:bg-orange-500 hover:text-white text-black font-bold px-4 py-2 rounded-xl text-xs transition-all shrink-0"
                  >
                    Adicionar Aula
                  </button>
                </div>
              </div>
            </div>
          </div>

          {/* Submit Button */}
          <div className="pt-4 border-t border-white/5">
            <button
              onClick={handleSubmit}
              disabled={isSubmitting}
              className="w-full bg-orange-500 hover:bg-orange-600 text-white font-extrabold text-base py-4 rounded-2xl active:scale-95 transition-all shadow-lg shadow-orange-500/25"
            >
              {isSubmitting ? 'Salvando...' : status === 'draft' ? 'Salvar como Rascunho' : (initialData ? 'Salvar e Publicar Curso' : 'Publicar Curso & Materiais')}
            </button>
          </div>
        </div>

      </div>
    </div>
  );
};

export const ManageCourses: React.FC = () => {
  const [courses, setCourses] = useState<Course[]>([]);
  const [isModalOpen, setIsModalOpen] = useState(false);
  const [editingCourse, setEditingCourse] = useState<Course | undefined>(undefined);
  const [loading, setLoading] = useState(true);
  const [activeTab, setActiveTab] = useState<'courses' | 'comments'>('courses');
  const [allComments, setAllComments] = useState<{comment: Comment, courseTitle: string}[]>([]);
  const [replyingTo, setReplyingTo] = useState<string | null>(null);
  const [replyText, setReplyText] = useState('');
  const [analytics, setAnalytics] = useState<InstructorAnalytics | null>(null);
  
  const { showToast } = useToast();

  const loadData = async () => {
    setLoading(true);
    try {
      const data = await getManagedCourses();
      setCourses(data);
      const analyticsResponse = await instructorApi.analytics();
      setAnalytics(analyticsResponse.data);
      const commentLists = await Promise.all(data.map(async (course) => ({ course, comments: await getComments(course.id) })));
      setAllComments(commentLists.flatMap(({ course, comments }) => comments.map((comment) => ({ comment, courseTitle: course.title }))));
    } catch {
      showToast('Não foi possível carregar o painel do instrutor.', 'error');
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    loadData();
  }, []);

  const handleCreate = () => {
    setEditingCourse(undefined);
    setIsModalOpen(true);
  };

  const handleEdit = (course: Course) => {
    setEditingCourse(course);
    setIsModalOpen(true);
  };

  const handleDelete = async (id: string) => {
    if (window.confirm('Tem certeza que deseja excluir este curso?')) {
      await deleteCourse(id);
      showToast('Curso removido com sucesso!', 'success');
      loadData();
    }
  };

  const handleDuplicate = async (id: string) => {
    try {
      await duplicateCourse(id);
      showToast('Cópia criada como rascunho.', 'success');
      loadData();
    } catch (error) {
      showToast(error instanceof Error ? error.message : 'Não foi possível duplicar este curso.', 'error');
    }
  };

  const handleSave = async (course: Course) => {
    await saveCourse(course);
    showToast('Curso e materiais salvos com sucesso!', 'success');
    loadData();
  };

  const handleSendReply = async (commentId: string) => {
    if (!replyText.trim()) return;

    const target = allComments.find(c => c.comment.id === commentId);
    if (target) {
      await replyToComment(commentId, replyText);
      showToast('Resposta enviada com sucesso!', 'success');
      setReplyingTo(null);
      setReplyText('');
      loadData();
    }
  };

  const handleModerateComment = async (commentId: string) => {
    if (!window.confirm('Remover este comentário permanentemente?')) return;
    await moderateComment(commentId);
    showToast('Comentário removido.', 'success');
    loadData();
  };

  // Metrics
  const totalLearners = analytics?.learners ?? 0;
  const completedLessons = analytics?.completedLessons ?? 0;
  const totalQuestions = analytics?.comments ?? allComments.length;
  const totalLessons = courses.reduce((acc, c) => acc + c.lessons.length, 0);
  const totalMaterials = courses.reduce((acc, c) => {
    const globalCount = c.attachments?.length || 0;
    const lessonCount = c.lessons.reduce((lAcc, l) => lAcc + (l.attachments?.length || 0), 0);
    return acc + globalCount + lessonCount;
  }, 0);

  return (
    <div className="min-h-screen bg-[#09090b] text-white pt-24 pb-20 px-6 md:px-12 max-w-[1440px] mx-auto">
      
      {/* Header */}
      <div className="flex flex-col md:flex-row md:items-center justify-between gap-6 pb-8 border-b border-white/10">
        <div>
          <div className="flex items-center gap-2 text-caption font-semibold uppercase tracking-caption text-orange-400 mb-2">
            <span>Compor HUB</span>
            <span>•</span>
            <span>Painel do Instrutor</span>
          </div>
          <h1 className="font-display text-subheading sm:text-heading-sm md:text-heading font-bold tracking-heading leading-heading">
            Gestão de Cursos & Materiais
          </h1>
          <p className="text-body-sm font-normal text-gray-400 mt-1 leading-body-sm tracking-body-sm">
            Cadastre videoaulas, organize trilhas e disponibilize arquivos de apoio para download.
          </p>
        </div>

        <div className="flex items-center gap-3">
          <button
            onClick={handleCreate}
            className="flex items-center gap-2 bg-orange-500 hover:bg-orange-600 text-white text-body-sm font-semibold tracking-body-sm px-6 py-3 rounded-[980px] shadow-xl shadow-orange-500/20 transition-all active:scale-95"
          >
            <Plus className="w-4 h-4" />
            <span>Novo Curso</span>
          </button>
        </div>
      </div>

      {/* Metrics Row */}
      <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-6 gap-4 my-8">
        <div className="bg-zinc-900/60 border border-white/10 p-5 rounded-[8px] shadow-xl">
          <span className="text-caption text-gray-400 font-semibold uppercase tracking-caption">Total de Cursos</span>
          <p className="font-display text-subheading md:text-heading-sm font-bold text-white mt-1">{courses.length}</p>
        </div>
        <div className="bg-zinc-900/60 border border-white/10 p-5 rounded-[8px] shadow-xl">
          <span className="text-caption text-gray-400 font-semibold uppercase tracking-caption">Total de Aulas</span>
          <p className="font-display text-subheading md:text-heading-sm font-bold text-orange-400 mt-1">{totalLessons}</p>
        </div>
        <div className="bg-zinc-900/60 border border-white/10 p-5 rounded-[8px] shadow-xl">
          <span className="text-caption text-gray-400 font-semibold uppercase tracking-caption">Materiais para Download</span>
          <p className="font-display text-subheading md:text-heading-sm font-bold text-emerald-400 mt-1">{totalMaterials}</p>
        </div>
        <div className="bg-zinc-900/60 border border-white/10 p-5 rounded-[8px] shadow-xl">
          <span className="text-caption text-gray-400 font-semibold uppercase tracking-caption">Alunos com Progresso</span>
          <p className="font-display text-subheading md:text-heading-sm font-bold text-white mt-1">{totalLearners.toLocaleString('pt-BR')}</p>
        </div>
        <div className="bg-zinc-900/60 border border-white/10 p-5 rounded-[8px] shadow-xl">
          <span className="text-caption text-gray-400 font-semibold uppercase tracking-caption">Aulas Concluídas</span>
          <p className="font-display text-subheading md:text-heading-sm font-bold text-orange-400 mt-1">{completedLessons.toLocaleString('pt-BR')}</p>
        </div>
        <div className="bg-zinc-900/60 border border-white/10 p-5 rounded-[8px] shadow-xl">
          <span className="text-caption text-gray-400 font-semibold uppercase tracking-caption">Dúvidas Recebidas</span>
          <p className="font-display text-subheading md:text-heading-sm font-bold text-white mt-1">{totalQuestions.toLocaleString('pt-BR')}</p>
        </div>
      </div>

      {/* Navigation Tabs */}
      <div className="flex gap-4 border-b border-white/10 mb-8">
        <button
          onClick={() => setActiveTab('courses')}
          className={`pb-3 text-body-sm font-semibold tracking-body-sm transition-all border-b-2 ${
            activeTab === 'courses'
              ? 'border-orange-500 text-white'
              : 'border-transparent text-gray-500 hover:text-gray-300'
          }`}
        >
          Cursos Cadastrados ({courses.length})
        </button>
        <button
          onClick={() => setActiveTab('comments')}
          className={`pb-3 text-body-sm font-semibold tracking-body-sm transition-all border-b-2 flex items-center gap-2 ${
            activeTab === 'comments'
              ? 'border-orange-500 text-white'
              : 'border-transparent text-gray-500 hover:text-gray-300'
          }`}
        >
          <MessageSquare className="w-4 h-4" />
          Dúvidas dos Alunos ({allComments.length})
        </button>
      </div>

      {/* Tab: Courses List */}
      {activeTab === 'courses' && (
        <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-6">
          {courses.map(course => {
            const courseAttachments = (course.attachments?.length || 0) + course.lessons.reduce((acc, l) => acc + (l.attachments?.length || 0), 0);
            
            return (
              <div 
                key={course.id} 
                className="bg-zinc-900/80 border border-white/10 rounded-[8px] overflow-hidden flex flex-col justify-between hover:border-orange-500/40 transition-all duration-300 group shadow-xl"
              >
                <div>
                  {/* Thumbnail */}
                  <div className="aspect-video relative overflow-hidden bg-black rounded-t-[8px]">
                    <img 
                      src={course.thumbnail} 
                      alt={course.title} 
                      className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-500" 
                    />
                    <div className="absolute top-3 left-3 bg-black/70 backdrop-blur-md px-2.5 py-1 rounded-[980px] text-caption font-semibold uppercase tracking-caption text-white border border-white/10">
                      {course.category}
                    </div>
                    {course.status === 'draft' && <div className="absolute top-3 right-3 bg-amber-500/20 backdrop-blur-md px-2.5 py-1 rounded-[980px] text-caption font-semibold uppercase tracking-caption text-amber-300 border border-amber-500/30">Rascunho</div>}
                  </div>

                  {/* Body */}
                  <div className="p-5">
                    <h3 className="font-display font-bold text-subheading text-white mb-2 line-clamp-1 group-hover:text-orange-400 transition-colors tracking-subheading leading-subheading">
                      {course.title}
                    </h3>
                    <p className="text-caption text-gray-400 line-clamp-2 leading-caption tracking-caption font-normal mb-4">
                      {course.description}
                    </p>

                    <div className="flex items-center gap-3 text-caption text-gray-400 pt-3 border-t border-white/5 font-semibold tracking-caption">
                      <span className="flex items-center gap-1 text-gray-300 font-semibold">
                        <Video className="w-3.5 h-3.5 text-orange-400" />
                        {course.lessons.length} Aulas
                      </span>
                      <span>•</span>
                      <span className="flex items-center gap-1 text-gray-300 font-semibold">
                        <Download className="w-3.5 h-3.5 text-emerald-400" />
                        {courseAttachments} Materiais
                      </span>
                    </div>
                  </div>
                </div>

                {/* Actions */}
                <div className="p-4 bg-black/40 border-t border-white/5 flex items-center justify-between gap-2">
                  <button
                    onClick={() => handleEdit(course)}
                    className="flex-1 flex items-center justify-center gap-1.5 py-2.5 rounded-[980px] bg-white/5 hover:bg-orange-500 hover:text-white text-body-sm font-semibold tracking-body-sm transition-colors text-gray-200"
                  >
                    <Edit2 className="w-3.5 h-3.5" />
                    Editar Conteúdo
                  </button>

                  <button onClick={() => void handleDuplicate(course.id)} className="p-2.5 rounded-[980px] bg-white/5 hover:bg-white/10 text-gray-400 hover:text-white transition-colors" title="Duplicar curso"><Copy className="w-4 h-4" /></button>

                  <button
                    onClick={() => handleDelete(course.id)}
                    className="p-2.5 rounded-[980px] bg-white/5 hover:bg-red-500/20 text-gray-400 hover:text-red-400 transition-colors"
                    title="Excluir Curso"
                  >
                    <Trash2 className="w-4 h-4" />
                  </button>
                </div>
              </div>
            );
          })}
        </div>
      )}

      {/* Tab: Comments / Questions */}
      {activeTab === 'comments' && (
        <div className="space-y-4 max-w-4xl">
          {allComments.length === 0 ? (
            <div className="text-center py-20 text-gray-500">
              <MessageSquare className="w-12 h-12 mx-auto mb-3 opacity-30 text-orange-400" />
              <p className="text-body-sm font-normal text-gray-400">Nenhuma dúvida enviada por alunos até o momento.</p>
            </div>
          ) : (
            allComments.map(({ comment, courseTitle }) => (
              <div key={comment.id} className="p-6 rounded-[8px] bg-zinc-900/60 border border-white/10 space-y-4 shadow-xl">
                <div className="flex items-center justify-between">
                  <div>
                    <span className="text-caption text-orange-400 font-semibold uppercase tracking-caption">{courseTitle}</span>
                    <h4 className="font-semibold text-white text-body-sm tracking-body-sm">{comment.user}</h4>
                  </div>
                  <span className="text-caption text-gray-500 font-mono">{comment.date}</span>
                </div>

                <p className="text-body-sm text-gray-300 bg-black/30 p-3.5 rounded-[8px] border border-white/5 leading-body-sm tracking-body-sm font-normal">
                  {comment.text}
                </p>

                {comment.reply ? (
                  <div className="pl-4 border-l-2 border-orange-500 bg-white/[0.02] p-3 rounded-r-[8px]">
                    <span className="text-caption font-semibold text-orange-400 uppercase tracking-caption">Sua Resposta ({comment.replyDate}):</span>
                    <p className="text-body-sm text-gray-200 mt-1 leading-body-sm">{comment.reply}</p>
                  </div>
                ) : (
                  <div>
                    {replyingTo === comment.id ? (
                      <div className="space-y-3 pt-2">
                        <textarea
                          value={replyText}
                          onChange={(e) => setReplyText(e.target.value)}
                          placeholder="Escreva a resposta para o aluno..."
                          className="w-full bg-black/60 border border-white/10 rounded-[8px] p-3 text-body-sm text-white focus:outline-none focus:border-orange-500/50 resize-none"
                          rows={3}
                        />
                        <div className="flex justify-end gap-2">
                            <button
                              onClick={() => { setReplyingTo(null); setReplyText(''); }}
                              className="px-3.5 py-2 rounded-[980px] text-body-sm text-gray-400 hover:text-white font-semibold"
                            >
                              Cancelar
                            </button>
                            <button
                              onClick={() => handleSendReply(comment.id)}
                              className="px-5 py-2 rounded-[980px] bg-orange-500 hover:bg-orange-600 text-white text-body-sm font-semibold tracking-body-sm shadow-xl"
                            >
                              Enviar Resposta
                            </button>
                          </div>
                        </div>
                    ) : (
                      <button
                        onClick={() => setReplyingTo(comment.id)}
                        className="text-body-sm font-semibold text-orange-400 hover:text-orange-300 tracking-body-sm"
                      >
                        Responder Dúvida &rarr;
                      </button>
                    )}
                  </div>
                )}
                <button onClick={() => handleModerateComment(comment.id)} className="text-xs text-red-400 hover:text-red-300 font-semibold">Remover comentário</button>
              </div>
            ))
          )}
        </div>
      )}

      {/* Create/Edit Modal */}
      <CourseModal 
        isOpen={isModalOpen}
        onClose={() => setIsModalOpen(false)}
        onSave={handleSave}
        initialData={editingCourse}
      />
    </div>
  );
};