import React, { useState, useCallback, useRef } from 'react';
import { UploadCloudIcon } from './Icons';

interface FileUploaderProps {
  onFilesAdded: (files: File[]) => void;
}

const FileUploader: React.FC<FileUploaderProps> = ({ onFilesAdded }) => {
  const [isDragging, setIsDragging] = useState(false);
  const fileInputRef = useRef<HTMLInputElement>(null);

  const handleDragEnter = useCallback((e: React.DragEvent<HTMLDivElement>) => {
    e.preventDefault();
    e.stopPropagation();
    setIsDragging(true);
  }, []);

  const handleDragLeave = useCallback((e: React.DragEvent<HTMLDivElement>) => {
    e.preventDefault();
    e.stopPropagation();
    setIsDragging(false);
  }, []);

  const handleDragOver = useCallback((e: React.DragEvent<HTMLDivElement>) => {
    e.preventDefault();
    e.stopPropagation();
  }, []);

  const handleDrop = useCallback((e: React.DragEvent<HTMLDivElement>) => {
    e.preventDefault();
    e.stopPropagation();
    setIsDragging(false);
    const files = Array.from(e.dataTransfer.files);
    if (files && files.length > 0) {
      onFilesAdded(files);
    }
  }, [onFilesAdded]);

  const handleFileSelect = (e: React.ChangeEvent<HTMLInputElement>) => {
    const files = Array.from(e.target.files || []);
    if (files && files.length > 0) {
      onFilesAdded(files);
    }
  };

  const openFileDialog = () => {
    fileInputRef.current?.click();
  };

  return (
    <div
      className={`relative border-2 border-dashed rounded-lg p-12 text-center transition-colors duration-200 ease-in-out ${
        isDragging ? 'border-indigo-400 bg-gray-800' : 'border-gray-600 hover:border-indigo-500'
      }`}
      onDragEnter={handleDragEnter}
      onDragLeave={handleDragLeave}
      onDragOver={handleDragOver}
      onDrop={handleDrop}
      onClick={openFileDialog}
    >
      <input
        ref={fileInputRef}
        type="file"
        multiple
        accept="image/*,video/*,.txt"
        className="hidden"
        onChange={handleFileSelect}
      />
      <div className="flex flex-col items-center justify-center space-y-4">
        <UploadCloudIcon className="w-12 h-12 text-gray-400" />
        <p className="text-gray-400">
          <span className="font-semibold text-indigo-400">Click to upload</span> or drag and drop
        </p>
        <p className="text-xs text-gray-500">Upload media and optional .txt captions (must have matching filenames)</p>
      </div>
    </div>
  );
};

export default FileUploader;