import { type ClassValue, clsx } from "clsx";
import { twMerge } from "tailwind-merge";

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

export function formatDate(
  date: Date | string,
  locale: string = "ar"
): string {
  const d = typeof date === "string" ? new Date(date) : date;

  if (isNaN(d.getTime())) {
    return "";
  }

  return new Intl.DateTimeFormat(locale === "ar" ? "ar-EG" : "en-US", {
    year: "numeric",
    month: "long",
    day: "numeric",
  }).format(d);
}

export function formatDateTime(
  date: Date | string,
  locale: string = "ar"
): string {
  const d = typeof date === "string" ? new Date(date) : date;

  if (isNaN(d.getTime())) {
    return "";
  }

  return new Intl.DateTimeFormat(locale === "ar" ? "ar-EG" : "en-US", {
    year: "numeric",
    month: "long",
    day: "numeric",
    hour: "2-digit",
    minute: "2-digit",
  }).format(d);
}

export function slugify(text: string): string {
  return text
    .toString()
    .toLowerCase()
    .trim()
    .replace(/\s+/g, "-")
    .replace(/[^\w\u0600-\u06FF-]+/g, "")
    .replace(/--+/g, "-")
    .replace(/^-+/, "")
    .replace(/-+$/, "");
}

export function getInitials(name: string): string {
  if (!name) return "";

  return name
    .split(" ")
    .filter(Boolean)
    .map((part) => part.charAt(0))
    .slice(0, 2)
    .join("")
    .toUpperCase();
}

export function truncate(text: string, length: number = 100): string {
  if (!text) return "";
  if (text.length <= length) return text;
  return text.slice(0, length).trimEnd() + "...";
}

export function formatCurrency(
  amount: number,
  currency: string = "USD",
  locale: string = "ar"
): string {
  return new Intl.NumberFormat(locale === "ar" ? "ar-EG" : "en-US", {
    style: "currency",
    currency,
  }).format(amount);
}

export function formatNumber(
  num: number,
  locale: string = "ar"
): string {
  return new Intl.NumberFormat(locale === "ar" ? "ar-EG" : "en-US").format(num);
}

export function getRelativeTime(date: Date | string, locale: string = "ar"): string {
  const d = typeof date === "string" ? new Date(date) : date;
  const now = new Date();
  const diff = now.getTime() - d.getTime();
  const seconds = Math.floor(diff / 1000);
  const minutes = Math.floor(seconds / 60);
  const hours = Math.floor(minutes / 60);
  const days = Math.floor(hours / 24);

  const rtf = new Intl.RelativeTimeFormat(locale === "ar" ? "ar-EG" : "en-US", {
    numeric: "auto",
  });

  if (days > 30) {
    return formatDate(date, locale);
  }
  if (days > 0) return rtf.format(-days, "day");
  if (hours > 0) return rtf.format(-hours, "hour");
  if (minutes > 0) return rtf.format(-minutes, "minute");
  return rtf.format(-seconds, "second");
}

export function debounce<T extends (...args: unknown[]) => unknown>(
  func: T,
  wait: number
): (...args: Parameters<T>) => void {
  let timeout: ReturnType<typeof setTimeout>;
  return (...args: Parameters<T>) => {
    clearTimeout(timeout);
    timeout = setTimeout(() => func(...args), wait);
  };
}

export function generateId(): string {
  return Math.random().toString(36).substring(2, 15);
}