(function() {
  var TOTAL_STEPS = 5;

  function tKey(key) {
    return typeof t === 'function' ? t(key) : key;
  }

  function tfKey(key, vars) {
    return typeof tf === 'function' ? tf(key, vars) : key;
  }

  function step3PanelId() {
    return 'step-panel-3-rest';
  }

  function stepFile(step) {
    return step === 3 ? 'step3-rest.html' : 'step' + step + '.html';
  }

  function panelIdForStep(step) {
    return step === 3 ? step3PanelId() : 'step-panel-' + step;
  }

  function buildIconSvg(href, width, height) {
    var svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
    svg.setAttribute('width', String(width));
    svg.setAttribute('height', String(height));
    var use = document.createElementNS('http://www.w3.org/2000/svg', 'use');
    use.setAttribute('href', href);
    svg.appendChild(use);
    return svg;
  }

  function appendHtmlFragment(container, html) {
    if (!container) return;
    var template = document.createElement('template');
    template.innerHTML = html;
    container.appendChild(template.content.cloneNode(true));
  }

  function setContinueButtonContent(button, label) {
    if (!button) return;
    button.textContent = label + ' ';
    button.appendChild(
      buildIconSvg(
        (window.APP_BASE || '') + 'icons/general/arrow-right.svg#icon',
        13,
        13
      )
    );
  }

  function renderStepCounter(counter, step, total) {
    if (!counter) return;
    var language = localStorage.getItem('crank_lang') || 'en';
    var parts = language === 'ru'
      ? { prefix: 'Шаг ', suffix: ' из ' + total }
      : { prefix: 'Step ', suffix: ' of ' + total };
    var strong = document.createElement('strong');
    counter.textContent = parts.prefix;
    strong.textContent = String(step);
    counter.appendChild(strong);
    counter.appendChild(document.createTextNode(parts.suffix));
  }

  function loadStep(step, callback) {
    var panelId = step === 3 ? step3PanelId() : 'step-panel-' + step;
    if (document.getElementById(panelId)) {
      if (callback) callback();
      return;
    }
    fetch(stepFile(step))
      .then(function(response) { return response.text(); })
      .then(function(html) {
        var container = document.getElementById('step-panel-container');
        appendHtmlFragment(container, html);
        var pane = document.getElementById(panelId);
        var activeStep = window.currentStep || 1;
        if (pane && step !== activeStep) {
          pane.hidden = true;
        }
        if (typeof applyLang === 'function') applyLang();
        if (callback) callback();
      })
      .catch(function() {
        if (callback) callback();
      });
  }

  function doGoToStep(step) {
    document.querySelectorAll('.step-number[data-step]').forEach(function(element) {
      var stepNumber = Number(element.getAttribute('data-step')) || 0;
      element.textContent = tfKey('wizard.step_short', { step: stepNumber });
    });

    document.querySelectorAll('.step-pane').forEach(function(pane) { pane.hidden = true; });
    var panelId = panelIdForStep(step);
    var pane = document.getElementById(panelId);
    if (pane) pane.hidden = false;

    document.querySelectorAll('.step-item').forEach(function(item, index) {
      var stepNumber = index + 1;
      item.classList.remove('active', 'done', 'pending');
      var indicator = item.querySelector('.step-indicator');
      var status = item.querySelector('.step-status-text');
      if (stepNumber < step) {
        item.classList.add('done');
        if (indicator) {
          indicator.replaceChildren(
            buildIconSvg(
              (window.APP_BASE || '') + 'icons/general/check.svg#icon',
              10,
              10
            )
          );
        }
        if (status) status.textContent = tKey('wizard.status.completed');
      } else if (stepNumber === step) {
        item.classList.add('active');
        if (indicator) indicator.textContent = stepNumber;
        if (status) status.textContent = tKey('wizard.status.in_progress');
      } else {
        item.classList.add('pending');
        if (indicator) indicator.textContent = stepNumber;
        if (status) status.textContent = tKey('wizard.status.not_started');
      }
    });

    var percent = Math.round((step / TOTAL_STEPS) * 100);
    var fill = document.querySelector('.progress-bar-fill');
    if (fill) fill.style.width = percent + '%';
    var percentNode = document.querySelector('.progress-pct');
    if (percentNode) percentNode.textContent = percent + '%';

    var counter = pane ? pane.querySelector('[data-step-counter]') : null;
    renderStepCounter(counter, step, TOTAL_STEPS);

    var backButton = document.querySelector('.btn-back');
    if (backButton) {
      backButton.disabled = step === 1;
    }

    var continueButton = document.querySelector('.btn-continue');
    if (continueButton) {
      if (step === TOTAL_STEPS) {
        var finalLabel = window.wizardMode === 'edit' ? tKey('wizard.button.save_changes') : tKey('wizard.button.create');
        setContinueButtonContent(continueButton, finalLabel);
        continueButton.classList.add('is-final-step');
      } else {
        setContinueButtonContent(continueButton, tKey('wizard.button.continue'));
        continueButton.classList.remove('is-final-step');
      }
    }

    window.currentStep = step;
    window.scrollTo({ top: 0, behavior: 'smooth' });
  }

  function goToStep(step) {
    if (step < 1 || step > TOTAL_STEPS) return;
    loadStep(step, function() { doGoToStep(step); });
  }

  function loadWizardPanels(steps) {
    return steps.reduce(function(chain, step) {
      return chain.then(function() {
        return new Promise(function(resolve) {
          loadStep(step, resolve);
        });
      });
    }, Promise.resolve());
  }

  window.addEventListener('crank:langchange', function() {
    if (window.currentStep) {
      doGoToStep(window.currentStep);
    }
  });

  function bindProtocolCards() {
    document.querySelectorAll('.protocol-card').forEach(function(card) {
      card.addEventListener('click', function() {
        if (card.hidden || card.getAttribute('aria-disabled') === 'true') {
          return;
        }
        document.querySelectorAll('.protocol-card').forEach(function(item) {
          item.classList.remove('selected');
          item.setAttribute('aria-checked', 'false');
        });
        card.classList.add('selected');
        card.setAttribute('aria-checked', 'true');

        var protocol = card.dataset.protocol
          || 'rest';

        window.wizardProtocol = protocol;
        var step3Name = document.getElementById('sidebar-step-3-name');
        var labels = window.CrankWizardState.step3Labels();
        if (step3Name) step3Name.textContent = labels[protocol] || tKey('wizard.step3.rest.label');

      });
      card.addEventListener('keydown', function(event) {
        if (event.key === 'Enter' || event.key === ' ') {
          event.preventDefault();
          card.click();
        }
      });
    });
  }

  function applyEditionProtocolVisibility(_capabilities) {
    window.wizardProtocol = 'rest';
    document.querySelectorAll('.protocol-card').forEach(function(card) {
      var isRest = (card.dataset.protocol || 'rest') === 'rest';
      card.hidden = !isRest;
      card.setAttribute('aria-disabled', isRest ? 'false' : 'true');
      card.classList.toggle('selected', isRest);
      card.setAttribute('aria-checked', isRest ? 'true' : 'false');
    });

    var step3Name = document.getElementById('sidebar-step-3-name');
    if (step3Name) {
      step3Name.textContent = tKey('wizard.step3.rest.label');
    }
  }

  window.CrankWizardShell = {
    TOTAL_STEPS: TOTAL_STEPS,
    step3PanelId: step3PanelId,
    loadStep: loadStep,
    doGoToStep: doGoToStep,
    goToStep: goToStep,
    loadWizardPanels: loadWizardPanels,
    bindProtocolCards: bindProtocolCards,
    applyEditionProtocolVisibility: applyEditionProtocolVisibility,
  };
}());