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

export { clsx };

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

export function formatTime(seconds: number): string {
    const s = Math.max(0, Math.floor(seconds));
    const h = Math.floor(s / 3600);
    const m = Math.floor((s % 3600) / 60);
    const sec = s % 60;
    const mm = String(m).padStart(2, "0");
    const ss = String(sec).padStart(2, "0");
    return h > 0 ? `${h}:${mm}:${ss}` : `${mm}:${ss}`;
}

export function copyToClipboard(text: string): Promise<boolean> {
  if (navigator.clipboard && window.isSecureContext) {
    return navigator.clipboard.writeText(text).then(() => true).catch(() => false);
  } else {
    const textArea = document.createElement("textarea");
    textArea.value = text;
    textArea.style.position = "fixed";
    textArea.style.left = "-999999px";
    textArea.style.top = "-999999px";
    document.body.appendChild(textArea);
    textArea.focus();
    textArea.select();
    return new Promise((resolve) => {
      const successful = document.execCommand('copy');
      textArea.remove();
      resolve(successful);
    });
  }
}

export function scrollToTop(behavior: ScrollBehavior = 'instant') {
  if (typeof window === 'undefined') return;
  window.scrollTo({ top: 0, left: 0, behavior });
  document.documentElement.scrollTop = 0;
  document.body.scrollTop = 0;
}