import { type ClassValue, clsx } from 'clsx';

export function cn(...inputs: ClassValue[]) {
  return clsx(inputs);
}

export function formatFileSize(bytes: number): string {
  if (bytes === 0) return '0 Bytes';
  const k = 1024;
  const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
  const i = Math.floor(Math.log(bytes) / Math.log(k));
  return Math.round(bytes / Math.pow(k, i) * 100) / 100 + ' ' + sizes[i];
}

export function downloadImage(url: string, filename: string = 'generated-image.png') {
  const link = document.createElement('a');
  link.href = url;
  link.download = filename;
  document.body.appendChild(link);
  link.click();
  document.body.removeChild(link);
}

// Download image with authentication support
export async function downloadAuthenticatedImage(
  imageUrl: string,
  filename: string = 'generated-image.png',
  authToken?: string,
  unixUser?: string
): Promise<void> {
  try {
    const headers: Record<string, string> = {};

    // Add authentication headers if provided
    if (unixUser) {
      headers['X-Unix-User'] = unixUser;
    } else if (authToken) {
      headers['Authorization'] = `Bearer ${authToken}`;
    }

    const response = await fetch(imageUrl, { headers });

    if (!response.ok) {
      throw new Error(`Failed to download image: ${response.statusText}`);
    }

    const blob = await response.blob();
    const url = window.URL.createObjectURL(blob);

    downloadImage(url, filename);

    // Clean up the object URL
    window.URL.revokeObjectURL(url);
  } catch (error) {
    console.error('Error downloading authenticated image:', error);
    throw error;
  }
}

export function fileToBase64(file: File): Promise<string> {
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = () => resolve(reader.result as string);
    reader.onerror = error => reject(error);
  });
}