/**
 * Click-to-copy badge — copies text to clipboard with visual feedback.
 */
import { resolveHost } from '../core/app-dom.js';

const COPY_SELECTOR = '.badge[data-copy="true"]';
const COPIED_CLASS = 'is-copied';

const getCopyValue = (badge) => {
  const explicit = badge.getAttribute('data-copy-value');
  if (explicit !== null && explicit !== '') {
    return explicit;
  }
  return (badge.textContent || '').trim();
};

const copyText = async (value) => {
  if (!value) {
    return false;
  }
  if (navigator.clipboard?.writeText) {
    await navigator.clipboard.writeText(value);
    return true;
  }
  const textarea = document.createElement('textarea');
  textarea.value = value;
  textarea.setAttribute('readonly', 'true');
  textarea.style.position = 'fixed';
  textarea.style.opacity = '0';
  document.body.appendChild(textarea);
  textarea.select();
  const ok = document.execCommand('copy');
  document.body.removeChild(textarea);
  return ok;
};

export function initBadgeCopy(root = document, options = {}) {
  const selector = String(options.selector || COPY_SELECTOR).trim() || COPY_SELECTOR;
  const host = resolveHost(root);
  const badges = Array.from(host.querySelectorAll(selector));
  if (!badges.length) {
    return { destroy: () => {} };
  }

  const cleanupFns = [];
  const timers = [];

  const enhanceBadge = (badge) => {
    if (badge.dataset.badgeCopyBound === '1') {
      return;
    }
    badge.dataset.badgeCopyBound = '1';

    if (!badge.querySelector('.badge-copy-icon')) {
      const icon = document.createElement('span');
      icon.className = 'badge-copy-icon';
      icon.setAttribute('aria-hidden', 'true');
      icon.innerHTML = '<i class="bi bi-copy"></i><i class="bi bi-check2"></i>';
      badge.appendChild(icon);
    }
    badge.setAttribute('role', 'button');
    badge.setAttribute('tabindex', '0');
    if (!badge.hasAttribute('aria-label')) {
      badge.setAttribute('aria-label', 'Copy to clipboard');
    }

    const handler = async (event) => {
      event.preventDefault();
      const value = getCopyValue(badge);
      const ok = await copyText(value);
      if (!ok) {
        return;
      }
      badge.classList.add(COPIED_CLASS);
      const timer = window.setTimeout(() => badge.classList.remove(COPIED_CLASS), 1200);
      timers.push(timer);
    };
    const onKeyDown = (event) => {
      if (event.key === 'Enter' || event.key === ' ') {
        handler(event);
      }
    };

    badge.addEventListener('click', handler);
    badge.addEventListener('keydown', onKeyDown);
    cleanupFns.push(() => {
      badge.removeEventListener('click', handler);
      badge.removeEventListener('keydown', onKeyDown);
      delete badge.dataset.badgeCopyBound;
    });
  };

  badges.forEach((badge) => {
    if (badge instanceof HTMLElement) {
      enhanceBadge(badge);
    }
  });

  const destroy = () => {
    cleanupFns.forEach((cleanup) => cleanup());
    timers.forEach((timer) => window.clearTimeout(timer));
  };

  return { destroy };
}

export const initCopyBadge = initBadgeCopy;