import { config } from '@config/index.js';
import crypto from 'crypto';

export function hashIP(ip: string): string {
  return crypto.createHash('sha256').update(ip + config.SESSION_SECRET).digest('hex').substring(0, 32);
}

export function formatNumber(num: number): string {
  if (num >= 1_000_000) {
    return (num / 1_000_000).toFixed(1).replace(/\.0$/, '') + 'M';
  }
  if (num >= 1_000) {
    return (num / 1_000).toFixed(1).replace(/\.0$/, '') + 'K';
  }
  return num.toString();
}

export function formatDate(date: string | Date, options?: Intl.DateTimeFormatOptions): string {
  const d = typeof date === 'string' ? new Date(date) : date;
  return d.toLocaleDateString('en-US', {
    year: 'numeric',
    month: 'short',
    day: 'numeric',
    ...options,
  });
}

export function formatRelativeTime(date: string | Date): string {
  const d = typeof date === 'string' ? new Date(date) : date;
  const now = new Date();
  const diffMs = now.getTime() - d.getTime();
  const diffSecs = Math.floor(diffMs / 1000);
  const diffMins = Math.floor(diffSecs / 60);
  const diffHours = Math.floor(diffMins / 60);
  const diffDays = Math.floor(diffHours / 24);

  if (diffSecs < 60) return 'just now';
  if (diffMins < 60) return `${diffMins}m ago`;
  if (diffHours < 24) return `${diffHours}h ago`;
  if (diffDays < 7) return `${diffDays}d ago`;
  if (diffDays < 30) return `${Math.floor(diffDays / 7)}w ago`;
  if (diffDays < 365) return `${Math.floor(diffDays / 30)}mo ago`;
  return `${Math.floor(diffDays / 365)}y ago`;
}

export function truncate(text: string, maxLength: number): string {
  if (text.length <= maxLength) return text;
  return text.substring(0, maxLength - 3) + '...';
}

export function isValidWhatsAppChannelUrl(url: string): boolean {
  return config.whatsappChannelRegex.test(url);
}

export function extractWhatsAppChannelCode(url: string): string | null {
  const match = url.match(/chat\.whatsapp\.com\/([A-Za-z0-9]{22})/);
  return match ? match[1] : null;
}

export function sanitizeHtml(html: string): string {
  return html
    .replace(/&/g, '&')
    .replace(/</g, '<')
    .replace(/>/g, '>')
    .replace(/"/g, '"')
    .replace(/'/g, '&#039;');
}

export function getSortOptions(): Array<{ value: string; label: string }> {
  return [
    { value: 'trending', label: 'Trending' },
    { value: 'followers', label: 'Most Followers' },
    { value: 'votes', label: 'Most Votes' },
    { value: 'newest', label: 'Newest' },
    { value: 'oldest', label: 'Oldest' },
    { value: 'alphabetical', label: 'Alphabetical' },
    { value: 'updated', label: 'Recently Updated' },
  ];
}

export function getSortField(sort: string): { field: string; order: 'asc' | 'desc' } {
  switch (sort) {
    case 'trending':
      return { field: 'voteCount', order: 'desc' };
    case 'followers':
      return { field: 'followerCount', order: 'desc' };
    case 'votes':
      return { field: 'voteCount', order: 'desc' };
    case 'newest':
      return { field: 'createdAt', order: 'desc' };
    case 'oldest':
      return { field: 'createdAt', order: 'asc' };
    case 'alphabetical':
      return { field: 'name', order: 'asc' };
    case 'updated':
      return { field: 'lastScrapedAt', order: 'desc' };
    default:
      return { field: 'createdAt', order: 'desc' };
  }
}

export function sleep(ms: number): Promise<void> {
  return new Promise(resolve => setTimeout(resolve, ms));
}

export function chunkArray<T>(array: T[], size: number): T[][] {
  const chunks: T[][] = [];
  for (let i = 0; i < array.length; i += size) {
    chunks.push(array.slice(i, i + size));
  }
  return chunks;
}