/**
 * Collection of rules for pre-validating a spreadsheet
 * @param file
 */
export function validateExcelImport(file: File) {
  if (!isExcelFile(file)) {
    throw new Error('Unknown file type');
  }

  // Check if file is empty
  if (file.size === 0) {
    throw new Error('File is empty');
  }

  // Limit file size of an Excel file to around 10MB
  if (file.size > 10_000_000) {
    throw new Error('File size limit (10MB) exceeded');
  }
}

/**
 * Collection of rules for pre-validating a project file
 * @param file
 */
export function validateProjectFile(file: File) {
  if (!isOntimeFile(file)) {
    throw new Error('Unknown file type');
  }

  // Check if file is empty
  if (file.size === 0) {
    throw new Error('File is empty');
  }

  // Limit file size of a project file to around 1MB
  if (file.size > 2_000_000) {
    throw new Error('File size limit (2MB) exceeded');
  }
}

/**
 * Removes a trailing file extension from a file name (e.g. "show.xlsx" -> "show")
 * A leading dot (dotfiles like ".gitignore") is not treated as an extension
 */
export function removeFileExtension(fileName: string): string {
  const lastDot = fileName.lastIndexOf('.');
  if (lastDot <= 0) {
    return fileName;
  }
  return fileName.slice(0, lastDot);
}

export function isExcelFile(file: File | null) {
  return file?.name.endsWith('.xlsx');
}

export function isOntimeFile(file: File | null) {
  return file?.name.endsWith('.json');
}

/**
 * Collection of rules for pre-validating a project file
 * @param file
 */
export function validateLogo(file: File) {
  // Check if file is empty
  if (file.size === 0) {
    throw new Error('File is empty');
  }

  // Limit file size of a project file to around 1.5MB
  if (file.size > 1_500_000) {
    throw new Error('File size limit (1.5MB) exceeded');
  }
}