import { useState, useEffect, useRef } from 'react'
import { X, Send } from 'lucide-react'
import { commentPost } from '../utils/api'
import { hapticFeedback, getTelegramApp } from '../utils/telegram'
import './CommentsModal.css'

export default function CommentsModal({ post, onClose, onUpdate }) {
  const [comment, setComment] = useState('')
  const [loading, setLoading] = useState(false)
  const [comments, setComments] = useState(post.comments || [])
  const modalRef = useRef(null)

  useEffect(() => {
    const tg = getTelegramApp()
    
    if (tg) {
      // Фиксировать высоту при изменении viewport (клавиатура)
      const handleViewportChange = () => {
        if (modalRef.current) {
          const currentHeight = modalRef.current.offsetHeight
          modalRef.current.style.height = `${currentHeight}px`
        }
      }
      
      tg.onEvent('viewportChanged', handleViewportChange)
      
      return () => {
        if (tg.offEvent) {
          tg.offEvent('viewportChanged', handleViewportChange)
        }
      }
    }
  }, [])

  const handleSubmit = async () => {
    if (!comment.trim()) return

    try {
      setLoading(true)
      hapticFeedback('light')
      
      const result = await commentPost(post._id, comment)
      setComments(result.comments)
      setComment('')
      hapticFeedback('success')
      onUpdate()
    } catch (error) {
      console.error('Ошибка добавления комментария:', error)
      hapticFeedback('error')
    } finally {
      setLoading(false)
    }
  }

  const formatDate = (date) => {
    const d = new Date(date)
    const now = new Date()
    const diff = Math.floor((now - d) / 1000) // секунды

    if (diff < 60) return 'только что'
    if (diff < 3600) return `${Math.floor(diff / 60)} мин`
    if (diff < 86400) return `${Math.floor(diff / 3600)} ч`
    
    return d.toLocaleDateString('ru-RU', { day: 'numeric', month: 'short' })
  }

  const handleOverlayClick = (e) => {
    // Закрывать только при клике на overlay, не на содержимое
    if (e.target === e.currentTarget) {
      onClose()
    }
  }

  return (
    <div className="comments-modal-overlay" onClick={handleOverlayClick}>
      <div className="comments-modal" ref={modalRef}>
        {/* Хедер */}
        <div className="modal-header">
          <button className="close-btn" onClick={onClose}>
            <X size={24} />
          </button>
          <h2>Комментарии ({comments.length})</h2>
          <div style={{ width: 32 }} />
        </div>

        {/* Список комментариев */}
        <div className="comments-list">
          {comments.length === 0 ? (
            <div className="empty-comments">
              <p>Пока нет комментариев</p>
              <span>Будьте первым!</span>
            </div>
          ) : (
            comments.map((c, index) => (
              <div key={index} className="comment-item fade-in">
                <img
                  src={c.author.photoUrl || '/default-avatar.png'}
                  alt={c.author.username}
                  className="comment-avatar"
                />
                <div className="comment-content">
                  <div className="comment-header">
                    <span className="comment-author">
                      {c.author.firstName} {c.author.lastName}
                    </span>
                    <span className="comment-time">{formatDate(c.createdAt)}</span>
                  </div>
                  <p className="comment-text">{c.content}</p>
                </div>
              </div>
            ))
          )}
        </div>

        {/* Форма добавления комментария */}
        <div className="comment-form">
          <input
            type="text"
            placeholder="Написать комментарий..."
            value={comment}
            onChange={e => setComment(e.target.value)}
            onKeyPress={e => e.key === 'Enter' && handleSubmit()}
            maxLength={500}
          />
          <button
            onClick={handleSubmit}
            disabled={loading || !comment.trim()}
            className="send-btn"
          >
            <Send size={20} />
          </button>
        </div>
      </div>
    </div>
  )
}