import { useState, useRef } from 'react';

interface ImportModalProps {
  isOpen: boolean;
  onClose: () => void;
  onImport: (words: any[]) => void;
}

export function ImportModal({ isOpen, onClose, onImport }: ImportModalProps) {
  const [content, setContent] = useState('');
  const [error, setError] = useState('');
  const fileInputRef = useRef<HTMLInputElement>(null);

  if (!isOpen) return null;

  const handleFileUpload = (e: React.ChangeEvent<HTMLInputElement>) => {
    const file = e.target.files?.[0];
    if (!file) return;

    const reader = new FileReader();
    reader.onload = (event) => {
      const text = event.target?.result as string;
      setContent(text);
      parseContent(text);
    };
    reader.readAsText(file);
  };

  const parseContent = (text: string) => {
    try {
      // Try JSON first
      const json = JSON.parse(text);
      if (Array.isArray(json)) {
        onImport(json);
        onClose();
        return;
      }
      if (json.words && Array.isArray(json.words)) {
        onImport(json.words);
        onClose();
        return;
      }
    } catch {
      // Not JSON, try CSV
      const lines = text.trim().split('\n');
      const words = lines.map((line, index) => {
        const parts = line.split(',').map(p => p.trim());
        return {
          id: `imported-${Date.now()}-${index}`,
          french: parts[0] || '',
          english: parts[1] || '',
          pronunciation: parts[2] || '',
          category: parts[3] || 'General',
          difficulty: 'beginner',
        };
      }).filter(w => w.french && w.english);

      if (words.length > 0) {
        onImport(words);
        onClose();
      } else {
        setError('无法解析文件格式');
      }
    }
  };

  const handleSubmit = () => {
    if (!content.trim()) {
      setError('请输入内容');
      return;
    }
    parseContent(content);
  };

  return (
    <div className="fixed inset-0 bg-black/50 backdrop-blur-sm flex items-center justify-center z-50 p-4">
      <div className="bg-white rounded-3xl shadow-2xl max-w-lg w-full p-6">
        <h2 className="text-2xl font-bold text-gray-800 mb-4">导入词库</h2>
        
        <div className="space-y-4">
          <div>
            <label className="block text-sm font-medium text-gray-600 mb-2">
              上传文件 (CSV 或 JSON)
            </label>
            <input
              ref={fileInputRef}
              type="file"
              accept=".csv,.json"
              onChange={handleFileUpload}
              className="w-full px-4 py-2 border border-gray-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-blue-500"
            />
          </div>

          <div className="relative">
            <div className="absolute inset-0 flex items-center">
              <div className="w-full border-t border-gray-200"></div>
            </div>
            <div className="relative flex justify-center text-sm">
              <span className="px-2 bg-white text-gray-500">或粘贴内容</span>
            </div>
          </div>

          <textarea
            value={content}
            onChange={(e) => setContent(e.target.value)}
            placeholder={`CSV 格式:
french,english,pronunciation,category
Bonjour,Hello,bɔ̃ʒuʁ,Greetings

JSON 格式:
[{"french": "Bonjour", "english": "Hello"}]`}
            className="w-full h-40 px-4 py-3 border border-gray-200 rounded-xl focus:outline-none focus:ring-2 focus:ring-blue-500 font-mono text-sm"
          />

          {error && (
            <p className="text-red-500 text-sm">{error}</p>
          )}

          <div className="flex gap-3 pt-2">
            <button
              onClick={onClose}
              className="flex-1 px-4 py-3 border border-gray-200 rounded-xl text-gray-600 hover:bg-gray-50 transition-colors"
            >
              取消
            </button>
            <button
              onClick={handleSubmit}
              className="flex-1 px-4 py-3 bg-gradient-to-r from-blue-500 to-indigo-600 text-white rounded-xl hover:shadow-lg transition-all"
            >
              导入
            </button>
          </div>
        </div>
      </div>
    </div>
  );
}