import React, { useState } from 'react';
import type { Message } from 'ai';
import { toast } from 'react-toastify';
import { MAX_FILES, isBinaryFile, shouldIncludeFile } from '~/utils/fileUtils';
import { createChatFromFolder } from '~/utils/folderImport';

interface ImportFolderButtonProps {
  className?: string;
  importChat?: (description: string, messages: Message[]) => Promise<void>;
}

export const ImportFolderButton: React.FC<ImportFolderButtonProps> = ({ className, importChat }) => {
  const [isLoading, setIsLoading] = useState(false);

  const handleFileChange = async (e: React.ChangeEvent<HTMLInputElement>) => {
    const allFiles = Array.from(e.target.files || []);

    if (allFiles.length > MAX_FILES) {
      toast.error(
        `This folder contains ${allFiles.length.toLocaleString()} files. This product is not yet optimized for very large projects. Please select a folder with fewer than ${MAX_FILES.toLocaleString()} files.`,
      );
      return;
    }

    const folderName = allFiles[0]?.webkitRelativePath.split('/')[0] || 'Unknown Folder';
    setIsLoading(true);

    const loadingToast = toast.loading(`Importing ${folderName}...`);

    try {
      const filteredFiles = allFiles.filter((file) => shouldIncludeFile(file.webkitRelativePath));

      if (filteredFiles.length === 0) {
        toast.error('No files found in the selected folder');
        return;
      }

      const fileChecks = await Promise.all(
        filteredFiles.map(async (file) => ({
          file,
          isBinary: await isBinaryFile(file),
        })),
      );

      const textFiles = fileChecks.filter((f) => !f.isBinary).map((f) => f.file);
      const binaryFilePaths = fileChecks
        .filter((f) => f.isBinary)
        .map((f) => f.file.webkitRelativePath.split('/').slice(1).join('/'));

      if (textFiles.length === 0) {
        toast.error('No text files found in the selected folder');
        return;
      }

      if (binaryFilePaths.length > 0) {
        toast.info(`Skipping ${binaryFilePaths.length} binary files`);
      }

      const messages = await createChatFromFolder(textFiles, binaryFilePaths, folderName);

      if (importChat) {
        await importChat(folderName, [...messages]);
      }

      toast.success('Folder imported successfully');
    } catch (error) {
      console.error('Failed to import folder:', error);
      toast.error('Failed to import folder');
    } finally {
      setIsLoading(false);
      toast.dismiss(loadingToast);
      e.target.value = ''; // Reset file input
    }
  };

  return (
    <>
      <input
        type="file"
        id="folder-import"
        className="hidden"
        webkitdirectory=""
        directory=""
        onChange={handleFileChange}
        {...({} as any)}
      />
      <button
        onClick={() => {
          const input = document.getElementById('folder-import');
          input?.click();
        }}
        className={className}
        disabled={isLoading}
      >
        <div className="i-ph:upload-simple" />
        {isLoading ? 'Importing...' : 'Import Folder'}
      </button>
    </>
  );
};