/**
 * Screen states: access denied, error, nav enabled.
 */

import {
  calendarEl,
  dutyListEl,
  loadingEl,
  errorEl,
  accessDeniedEl,
  headerEl,
  weekdaysEl,
  prevBtn,
  nextBtn
} from "./dom.js";

/**
 * Show access-denied view and hide calendar/list/loading/error.
 * @param {string} [serverDetail] - message from API 403 detail (shown below main text when present)
 */
export function showAccessDenied(serverDetail) {
  if (headerEl) headerEl.hidden = true;
  if (weekdaysEl) weekdaysEl.hidden = true;
  if (calendarEl) calendarEl.hidden = true;
  if (dutyListEl) dutyListEl.hidden = true;
  if (loadingEl) loadingEl.classList.add("hidden");
  if (errorEl) errorEl.hidden = true;
  if (accessDeniedEl) {
    accessDeniedEl.innerHTML = "<p>Доступ запрещён.</p>";
    if (serverDetail && serverDetail.trim()) {
      const detail = document.createElement("p");
      detail.className = "access-denied-detail";
      detail.textContent = serverDetail;
      accessDeniedEl.appendChild(detail);
    }
    accessDeniedEl.hidden = false;
  }
}

/**
 * Hide access-denied and show calendar/list/header/weekdays.
 */
export function hideAccessDenied() {
  if (accessDeniedEl) accessDeniedEl.hidden = true;
  if (headerEl) headerEl.hidden = false;
  if (weekdaysEl) weekdaysEl.hidden = false;
  if (calendarEl) calendarEl.hidden = false;
  if (dutyListEl) dutyListEl.hidden = false;
}

/**
 * Show error message and hide loading.
 * @param {string} msg - Error text
 */
export function showError(msg) {
  if (errorEl) {
    errorEl.textContent = msg;
    errorEl.hidden = false;
  }
  if (loadingEl) loadingEl.classList.add("hidden");
}

/**
 * Enable or disable prev/next month buttons.
 * @param {boolean} enabled
 */
export function setNavEnabled(enabled) {
  if (prevBtn) prevBtn.disabled = !enabled;
  if (nextBtn) nextBtn.disabled = !enabled;
}