import { useState } from 'react'
import { useNavigate } from 'react-router-dom'
import { Heart, MessageCircle, MoreVertical, ChevronLeft, ChevronRight, Download, Send, X, ZoomIn } from 'lucide-react'
import { likePost, deletePost, sendPhotoToTelegram } from '../utils/api'
import { hapticFeedback, showConfirm } from '../utils/telegram'
import './PostCard.css'

const TAG_COLORS = {
  furry: '#FF8A33',
  anime: '#4A90E2',
  other: '#A0A0A0'
}

const TAG_NAMES = {
  furry: 'Furry',
  anime: 'Anime',
  other: 'Other'
}

export default function PostCard({ post, currentUser, onUpdate }) {
  const navigate = useNavigate()
  const [liked, setLiked] = useState(post.likes?.includes(currentUser.id) || false)
  const [likesCount, setLikesCount] = useState(post.likes?.length || 0)
  const [currentImageIndex, setCurrentImageIndex] = useState(0)
  const [showFullView, setShowFullView] = useState(false)
  
  // Проверка на существование автора
  if (!post.author) {
    console.warn('[PostCard] Post without author:', post._id)
    return null // Не показываем посты без автора
  }
  
  // Поддержка и старого поля imageUrl и нового images
  // Фильтруем старые URL из Telegram API
  const allImages = post.images && post.images.length > 0 ? post.images : (post.imageUrl ? [post.imageUrl] : [])
  const images = allImages.filter(img => {
    // Игнорируем старые URL из Telegram API
    if (img && typeof img === 'string' && img.includes('api.telegram.org/file/bot')) {
      console.warn('[PostCard] Skipping old Telegram URL:', img)
      return false
    }
    return true
  })

  const handleLike = async () => {
    try {
      hapticFeedback('light')
      const result = await likePost(post._id)
      setLiked(result.liked)
      setLikesCount(result.likes)
      if (result.liked) {
        hapticFeedback('success')
      }
    } catch (error) {
      console.error('Ошибка лайка:', error)
    }
  }


  const handleDelete = async () => {
    const confirmed = await showConfirm('Удалить этот пост?')
    if (confirmed) {
      try {
        await deletePost(post._id)
        hapticFeedback('success')
        onUpdate()
      } catch (error) {
        console.error('Ошибка удаления:', error)
      }
    }
  }

  const formatDate = (date) => {
    const d = new Date(date)
    return d.toLocaleDateString('ru-RU', { day: 'numeric', month: 'short' })
  }

  const goToProfile = () => {
    if (post.author?._id) {
      navigate(`/user/${post.author._id}`)
    }
  }

  const openFullView = () => {
    if (images.length > 0) {
      setShowFullView(true)
      hapticFeedback('light')
    }
  }

  const handleNext = () => {
    if (currentImageIndex < images.length - 1) {
      setCurrentImageIndex(currentImageIndex + 1)
      hapticFeedback('light')
    }
  }

  const handlePrev = () => {
    if (currentImageIndex > 0) {
      setCurrentImageIndex(currentImageIndex - 1)
      hapticFeedback('light')
    }
  }

  const handleDownloadImage = async () => {
    try {
      hapticFeedback('light')
      const imageUrl = images[currentImageIndex]
      await sendPhotoToTelegram(imageUrl)
      hapticFeedback('success')
    } catch (error) {
      console.error('Ошибка отправки фото:', error)
      hapticFeedback('error')
    }
  }

  return (
    <div className="post-card card fade-in">
      {/* Хедер поста */}
      <div className="post-header">
        <div className="post-author" onClick={goToProfile}>
          <img
            src={post.author?.photoUrl || '/default-avatar.png'}
            alt={post.author?.username || post.author?.firstName || 'User'}
            className="author-avatar"
            onError={(e) => {
              e.target.src = '/default-avatar.png'
            }}
          />
          <div className="author-info">
            <div className="author-name">
              {post.author?.firstName || ''} {post.author?.lastName || ''}
              {!post.author?.firstName && !post.author?.lastName && 'Пользователь'}
            </div>
            <div className="post-date">
              @{post.author?.username || post.author?.firstName || 'user'} · {formatDate(post.createdAt)}
            </div>
          </div>
        </div>
        
        <button 
          className="menu-btn" 
          onClick={(e) => {
            e.stopPropagation()
            navigate(`/post/${post._id}/menu`)
          }}
        >
          <MoreVertical size={20} />
        </button>
      </div>

      {/* Контент */}
      {post.content && (
        <div className="post-content">
          {post.content}
        </div>
      )}

      {/* Изображения */}
      {images.length > 0 && (
        <div className="post-images">
          <div className="image-carousel" onClick={openFullView} style={{ cursor: 'pointer' }}>
            <img src={images[currentImageIndex]} alt={`Image ${currentImageIndex + 1}`} />
            
            {images.length > 1 && (
              <>
                {currentImageIndex > 0 && (
                  <button className="carousel-btn prev" onClick={(e) => { e.stopPropagation(); setCurrentImageIndex(currentImageIndex - 1); }}>
                    <ChevronLeft size={24} />
                  </button>
                )}
                
                {currentImageIndex < images.length - 1 && (
                  <button className="carousel-btn next" onClick={(e) => { e.stopPropagation(); setCurrentImageIndex(currentImageIndex + 1); }}>
                    <ChevronRight size={24} />
                  </button>
                )}
                
                <div className="carousel-dots">
                  {images.map((_, index) => (
                    <span 
                      key={index} 
                      className={`dot ${index === currentImageIndex ? 'active' : ''}`}
                      onClick={(e) => { e.stopPropagation(); setCurrentImageIndex(index); }}
                    />
                  ))}
                </div>
              </>
            )}
            
            {/* Индикатор что можно открыть fullview */}
            <div className="fullview-hint">
              <ZoomIn size={20} />
            </div>
          </div>
        </div>
      )}

      {/* Теги */}
      <div className="post-tags">
        {post.tags.map((tag, index) => (
          <span
            key={index}
            className="post-tag"
            style={{ backgroundColor: TAG_COLORS[tag] }}
          >
            {TAG_NAMES[tag]}
          </span>
        ))}
        {post.isNSFW && (
          <span className="nsfw-badge">NSFW</span>
        )}
      </div>

      {/* Действия */}
      <div className="post-actions">
        <button
          className={`action-btn ${liked ? 'active' : ''}`}
          onClick={(e) => {
            e.stopPropagation()
            handleLike()
          }}
        >
          <Heart size={20} fill={liked ? '#FF3B30' : 'none'} stroke={liked ? '#FF3B30' : 'currentColor'} />
          <span>{likesCount}</span>
        </button>

        <button 
          className="action-btn" 
          onClick={(e) => {
            e.stopPropagation()
            navigate(`/post/${post._id}/comments`)
          }}
        >
          <MessageCircle size={20} stroke="currentColor" />
          <span>{post.comments.length}</span>
        </button>

        {images.length > 0 && (
          <button 
            className="action-btn" 
            onClick={async (e) => {
              e.stopPropagation()
              try {
                hapticFeedback('light')
                const imageUrl = images[currentImageIndex] || post.imageUrl
                await sendPhotoToTelegram(imageUrl)
                hapticFeedback('success')
              } catch (error) {
                console.error('Ошибка отправки фото:', error)
                hapticFeedback('error')
              }
            }}
            title="Отправить фото в Telegram"
          >
            <Send size={20} stroke="currentColor" />
          </button>
        )}
      </div>

      {/* Fullview модал */}
      {showFullView && (
        <div className="image-fullview" onClick={() => setShowFullView(false)}>
          <div className="fullview-header">
            <button className="fullview-btn" onClick={(e) => { e.stopPropagation(); setShowFullView(false); }}>
              <X size={24} />
            </button>
            <span className="fullview-counter">
              {currentImageIndex + 1} / {images.length}
            </span>
            <button 
              className="fullview-btn" 
              onClick={(e) => { e.stopPropagation(); handleDownloadImage(); }}
              title="Отправить в Telegram"
            >
              <Download size={24} />
            </button>
          </div>

          <div className="fullview-content" onClick={(e) => e.stopPropagation()}>
            <img 
              src={images[currentImageIndex]} 
              alt={`Full view ${currentImageIndex + 1}`}
              draggable={false}
            />
            
            {images.length > 1 && (
              <>
                {currentImageIndex > 0 && (
                  <button className="fullview-nav-btn prev" onClick={(e) => { e.stopPropagation(); handlePrev(); }}>
                    <ChevronLeft size={32} />
                  </button>
                )}
                
                {currentImageIndex < images.length - 1 && (
                  <button className="fullview-nav-btn next" onClick={(e) => { e.stopPropagation(); handleNext(); }}>
                    <ChevronRight size={32} />
                  </button>
                )}
              </>
            )}
          </div>

          {images.length > 1 && (
            <div className="fullview-dots">
              {images.map((_, index) => (
                <span 
                  key={index} 
                  className={`fullview-dot ${index === currentImageIndex ? 'active' : ''}`}
                  onClick={(e) => { e.stopPropagation(); setCurrentImageIndex(index); }}
                />
              ))}
            </div>
          )}
        </div>
      )}
    </div>
  )
}