/**
 * 사전 단어 항목 컴포넌트
 * - 사전 관리 페이지의 단어 테이블 행
 */
import { useState, useEffect, useRef } from 'react';
import { motion, AnimatePresence } from 'framer-motion';
import { Trash2, ChevronDown } from 'lucide-react';

/**
 * 품사 태그 옵션
 */
export const POS_TAGS = [
  {
    value: 'NNP',
    label: '고유명사 (NNP)',
    description: '사람, 그룹, 프로그램 이름 등',
    examples: '프로미스나인, 송하영, 뮤직뱅크',
  },
  {
    value: 'NNG',
    label: '일반명사 (NNG)',
    description: '일반적인 명사',
    examples: '직캠, 팬미팅, 콘서트',
  },
  {
    value: 'SL',
    label: '외국어 (SL)',
    description: '영어 등 외국어 단어',
    examples: 'fromis_9, YouTube, fromm',
  },
];

/**
 * 단어 항목 컴포넌트
 * @param {Object} props
 * @param {string} props.id - 단어 고유 ID
 * @param {string} props.word - 단어
 * @param {string} props.pos - 품사 태그
 * @param {number} props.index - 목록 인덱스
 * @param {Function} props.onUpdate - 수정 핸들러 (id, word, pos)
 * @param {Function} props.onDelete - 삭제 핸들러 ()
 */
function WordItem({ id, word, pos, index, onUpdate, onDelete }) {
  const [isEditing, setIsEditing] = useState(false);
  const [editWord, setEditWord] = useState(word);
  const [editPos, setEditPos] = useState(pos);
  const [showPosDropdown, setShowPosDropdown] = useState(false);
  const dropdownRef = useRef(null);

  // 외부 클릭 시 드롭다운 닫기
  useEffect(() => {
    const handleClickOutside = (event) => {
      if (dropdownRef.current && !dropdownRef.current.contains(event.target)) {
        setShowPosDropdown(false);
      }
    };

    if (showPosDropdown) {
      document.addEventListener('mousedown', handleClickOutside);
    }
    return () => document.removeEventListener('mousedown', handleClickOutside);
  }, [showPosDropdown]);

  const handleSave = () => {
    if (editWord.trim() && (editWord.trim() !== word || editPos !== pos)) {
      onUpdate(id, editWord.trim(), editPos);
    }
    setIsEditing(false);
  };

  const handleKeyDown = (e) => {
    if (e.key === 'Enter') {
      handleSave();
    } else if (e.key === 'Escape') {
      setEditWord(word);
      setEditPos(pos);
      setIsEditing(false);
    }
  };

  return (
    <motion.tr
      initial={{ opacity: 0, y: -10 }}
      animate={{ opacity: 1, y: 0 }}
      exit={{ opacity: 0, x: -20 }}
      className="group hover:bg-gray-50 transition-colors"
    >
      <td className="px-4 py-3 text-sm text-gray-400 w-16">{index + 1}</td>
      <td className="px-4 py-3">
        {isEditing ? (
          <input
            type="text"
            value={editWord}
            onChange={(e) => setEditWord(e.target.value)}
            onKeyDown={handleKeyDown}
            onBlur={handleSave}
            autoFocus
            className="w-full px-3 py-1.5 border border-primary rounded-lg focus:outline-none focus:ring-2 focus:ring-primary/20"
          />
        ) : (
          <span
            onClick={() => setIsEditing(true)}
            className="cursor-pointer hover:text-primary transition-colors font-medium"
          >
            {word}
          </span>
        )}
      </td>
      <td className="px-4 py-3 w-48">
        <div className="relative" ref={dropdownRef}>
          <button
            onClick={() => setShowPosDropdown(!showPosDropdown)}
            className="flex items-center gap-2 px-3 py-1.5 bg-gray-100 hover:bg-gray-200 rounded-lg text-sm transition-colors w-full justify-between"
          >
            <span>
              {POS_TAGS.find((t) => t.value === (isEditing ? editPos : pos))?.label.split(' ')[0] || pos}
            </span>
            <ChevronDown
              size={14}
              className={`transition-transform ${showPosDropdown ? 'rotate-180' : ''}`}
            />
          </button>
          <AnimatePresence>
            {showPosDropdown && (
              <motion.div
                initial={{ opacity: 0, y: -5 }}
                animate={{ opacity: 1, y: 0 }}
                exit={{ opacity: 0, y: -5 }}
                className="absolute top-full left-0 mt-1 w-64 bg-white rounded-xl shadow-lg border border-gray-200 py-1 z-20"
              >
                {POS_TAGS.map((tag) => (
                  <button
                    key={tag.value}
                    onClick={() => {
                      if (isEditing) {
                        setEditPos(tag.value);
                      } else {
                        onUpdate(id, word, tag.value);
                      }
                      setShowPosDropdown(false);
                    }}
                    className={`w-full px-4 py-2.5 text-left hover:bg-gray-50 transition-colors ${
                      (isEditing ? editPos : pos) === tag.value ? 'bg-primary/5 text-primary' : ''
                    }`}
                  >
                    <div className="font-medium text-sm">{tag.label}</div>
                    <div className="text-xs text-gray-400">{tag.description}</div>
                    <div className="text-xs text-gray-300 mt-0.5">예: {tag.examples}</div>
                  </button>
                ))}
              </motion.div>
            )}
          </AnimatePresence>
        </div>
      </td>
      <td className="px-4 py-3 w-20">
        <button
          onClick={onDelete}
          className="p-2 text-gray-400 hover:text-red-500 hover:bg-red-50 rounded-lg transition-colors opacity-0 group-hover:opacity-100"
        >
          <Trash2 size={16} />
        </button>
      </td>
    </motion.tr>
  );
}

export default WordItem;
