/**
 * Generate a URL-friendly slug from a collection name
 */
export function generateSlug(name) {
  return name
    .toLowerCase()
    .trim()
    // Replace spaces and special characters with hyphens
    .replace(/[^a-z0-9]+/g, '-')
    // Remove leading/trailing hyphens
    .replace(/^-+|-+$/g, '')
    // Limit length to 50 characters
    .substring(0, 50)
    // Remove trailing hyphen if truncation created one
    .replace(/-+$/, '');
}

/**
 * Generate a unique slug by checking against existing slugs
 */
export async function generateUniqueSlug(name, existingSlugs = []) {
  const baseSlug = generateSlug(name);
  
  // If base slug is unique, use it
  if (!existingSlugs.includes(baseSlug)) {
    return baseSlug;
  }
  
  // Find the next available number suffix
  let counter = 2;
  let uniqueSlug = `${baseSlug}-${counter}`;
  
  while (existingSlugs.includes(uniqueSlug)) {
    counter++;
    uniqueSlug = `${baseSlug}-${counter}`;
  }
  
  return uniqueSlug;
}

/**
 * Validate a slug format
 */
export function isValidSlug(slug) {
  if (!slug || typeof slug !== 'string') {
    return false;
  }
  
  // Must be 1-50 characters, lowercase letters, numbers, and hyphens only
  // Cannot start or end with hyphen
  const slugRegex = /^[a-z0-9]([a-z0-9-]*[a-z0-9])?$/;
  return slugRegex.test(slug) && slug.length <= 50;
}

/**
 * Convert existing collection names to suggested slugs for migration
 */
export function suggestSlugForCollection(collection) {
  const baseSlug = generateSlug(collection.name);
  return {
    id: collection.id,
    name: collection.name,
    currentSlug: collection.slug || null,
    suggestedSlug: baseSlug
  };
}