export default class ReplyToComment {
  constructor(cfg = {}) {
    if (!cfg.form || cfg.form.className !== 'comments__foot') {
      return false;
    }
    if (!cfg.links || cfg.links.length === 0) {
      return false;
    }
    this.form = cfg.form;
    this.backupForm = cfg.form.querySelector('#respond').cloneNode(true);
    this.links = Array.prototype.slice.call(cfg.links);
    this.links.forEach((link) => {
      link.addEventListener('click', e => this.handleLinkClick(e, link));
    });
  }

  insertForm(container, id, author) {
    const form = this.backupForm.cloneNode(true);
    const cancel = form.querySelector('#cancel-comment-reply-link');
    form.querySelector('.comment-respond__title-text').innerHTML = `Reply to ${author}`;
    form.querySelector('#submit').value = 'Post reply';
    form.querySelector('#comment_parent').value = id;
    cancel.style.display = 'inline-block';
    cancel.addEventListener('click', e => this.handleCancelClick(e, container));
    container.appendChild(form);
  }

  handleCancelClick(e, container) {
    e.preventDefault();
    container.parentNode.querySelector('.comment__reply').classList.remove('is-hidden');
    while (container.firstChild) {
      container.removeChild(container.firstChild);
    }
    this.form.appendChild(this.backupForm);
  }

  handleLinkClick(e, link) {
    e.preventDefault();
    link.classList.add('is-hidden');
    while (this.form.firstChild) {
      this.form.removeChild(this.form.firstChild);
    }
    const container = link.parentNode.querySelector('.comment__inline-reply');
    const { commentId, commentAuthor } = link.dataset;
    this.insertForm(container, commentId, commentAuthor);
  }
}