(function () {
  const EMAIL_STORAGE_KEY = 'ff_member_form_email_v1';
  const boot = window.APP_BOOT || { steps: [], csrf: '', contactEmail: '' };
  const baseUrl = String(boot.baseUrl || '').replace(/\/+$/, '');
  const schemaSteps = Array.isArray(boot.steps) ? boot.steps : [];

  const state = {
    email: '',
    currentStep: 1,
    totalSteps: schemaSteps.length,
    summaryStep: schemaSteps.length + 1,
    autosaveId: null,
    uploads: {},
    isSubmitting: false,
    summaryMissingCount: 0,
  };

  const disclaimerSection = document.getElementById('disclaimerSection');
  const disclaimerReadCheckbox = document.getElementById('disclaimerReadCheckbox');
  const disclaimerReadError = document.getElementById('disclaimerReadError');
  const acceptDisclaimerBtn = document.getElementById('acceptDisclaimerBtn');

  const startSection = document.getElementById('startSection');
  const startForm = document.getElementById('startForm');
  const startIntroText = document.getElementById('startIntroText');
  const startEmailField = document.getElementById('startEmailField');
  const startActions = document.getElementById('startActions');
  const startEmailInput = document.getElementById('startEmail');
  const startEmailError = document.getElementById('startEmailError');
  const startSubmitBtn = document.getElementById('startSubmitBtn');
  const resetDataBtn = document.getElementById('resetDataBtn');
  const compactStatusBox = document.getElementById('compactStatusBox');
  const statusEmailValue = document.getElementById('statusEmailValue');
  const draftStatusValue = document.getElementById('draftStatusValue');
  const startFeedbackMessage = document.getElementById('startFeedbackMessage');
  const feedbackMessage = document.getElementById('feedbackMessage');

  const wizardSection = document.getElementById('wizardSection');
  const applicationForm = document.getElementById('applicationForm');
  const applicationEmail = document.getElementById('applicationEmail');
  const progress = document.getElementById('progress');
  const prevBtn = document.getElementById('prevBtn');
  const nextBtn = document.getElementById('nextBtn');
  const submitBtn = document.getElementById('submitBtn');
  const submitSpinner = document.getElementById('submitSpinner');
  const submitLabel = submitBtn ? submitBtn.querySelector('[data-submit-label]') : null;
  const summarySection = document.getElementById('summarySection');
  const summaryContent = document.getElementById('summaryContent');
  const summaryMissingNotice = document.getElementById('summaryMissingNotice');
  const stepElements = Array.from(document.querySelectorAll('.step'));
  const startEmailRequiredMark = document.querySelector('#startEmailField .required-mark-field-start');
  const fieldContainersByKey = new Map();
  const fieldsByKey = new Map();

  document.querySelectorAll('.field[data-field]').forEach((container) => {
    const key = String(container.getAttribute('data-field') || '').trim();
    if (key !== '') {
      fieldContainersByKey.set(key, container);
    }
  });

  schemaSteps.forEach((step) => {
    const fields = Array.isArray(step.fields) ? step.fields : [];
    fields.forEach((field) => {
      if (!field || typeof field !== 'object') {
        return;
      }
      const key = String(field.key || '').trim();
      if (key !== '') {
        fieldsByKey.set(key, field);
      }
    });
  });

  function appUrl(path) {
    const normalizedPath = String(path || '').replace(/^\/+/, '');
    return (baseUrl ? baseUrl + '/' : '/') + normalizedPath;
  }

  function setFeedbackText(target, text, isError) {
    if (!target) {
      return;
    }
    target.textContent = text || '';
    target.classList.toggle('error-text', Boolean(isError));
  }

  function setFeedback(text, isError, scope) {
    const targetScope = scope || (wizardSection && !wizardSection.classList.contains('hidden') ? 'wizard' : 'start');

    if (targetScope === 'wizard') {
      setFeedbackText(feedbackMessage, text, isError);
      setFeedbackText(startFeedbackMessage, '', false);
      return;
    }

    if (targetScope === 'start') {
      setFeedbackText(startFeedbackMessage, text, isError);
      setFeedbackText(feedbackMessage, '', false);
      return;
    }

    setFeedbackText(feedbackMessage, text, isError);
    setFeedbackText(startFeedbackMessage, text, isError);
  }

  function setDraftStatus(text, isError) {
    draftStatusValue.textContent = text || '';
    draftStatusValue.classList.toggle('error-text', Boolean(isError));
  }

  function setStartEmailError(text) {
    if (!startEmailError) {
      return;
    }
    startEmailError.textContent = text || '';
  }

  function setDisclaimerError(text) {
    if (!disclaimerReadError) {
      return;
    }
    disclaimerReadError.textContent = text || '';
  }

  function updateStartEmailRequiredMarker() {
    if (!startEmailRequiredMark) {
      return;
    }

    const email = normalizeEmail(startEmailInput.value || '');
    startEmailRequiredMark.classList.toggle('hidden', isValidEmail(email));
  }

  function formatTimestamp(isoDate) {
    if (!isoDate) {
      return '';
    }

    const date = new Date(isoDate);
    if (Number.isNaN(date.getTime())) {
      return String(isoDate);
    }

    return date.toLocaleString('de-DE');
  }

  function normalizeEmail(email) {
    return (email || '').trim().toLowerCase();
  }

  function isValidEmail(email) {
    return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);
  }

  function rememberEmail(email) {
    try {
      localStorage.setItem(EMAIL_STORAGE_KEY, email);
    } catch (_err) {
      // ignore localStorage errors
    }
  }

  function getRememberedEmail() {
    try {
      return localStorage.getItem(EMAIL_STORAGE_KEY) || '';
    } catch (_err) {
      return '';
    }
  }

  function forgetRememberedEmail() {
    try {
      localStorage.removeItem(EMAIL_STORAGE_KEY);
    } catch (_err) {
      // ignore localStorage errors
    }
  }

  function updateDisclaimerAcceptanceState() {
    if (!acceptDisclaimerBtn || !disclaimerReadCheckbox) {
      return;
    }

    const accepted = disclaimerReadCheckbox.checked;
    acceptDisclaimerBtn.disabled = !accepted;
    if (accepted) {
      setDisclaimerError('');
    }
  }

  function enterCompactStatus(email) {
    statusEmailValue.textContent = email;
    startSection.classList.add('compact-mode');
    compactStatusBox.classList.remove('hidden');
    startIntroText.classList.add('hidden');
    startEmailField.classList.add('hidden');
    startActions.classList.add('hidden');
  }

  function leaveCompactStatus() {
    startSection.classList.remove('compact-mode');
    compactStatusBox.classList.add('hidden');
    startIntroText.classList.remove('hidden');
    startEmailField.classList.remove('hidden');
    startActions.classList.remove('hidden');
    statusEmailValue.textContent = '-';
    setDraftStatus('Noch nicht gespeichert', false);
  }

  function lockEmail(email) {
    state.email = email;
    applicationEmail.value = email;
    startEmailInput.value = email;
    startEmailInput.readOnly = true;
    startEmailInput.setAttribute('aria-readonly', 'true');
    updateStartEmailRequiredMarker();
    rememberEmail(email);
    enterCompactStatus(email);
  }

  function unlockEmail(clearInput) {
    state.email = '';
    applicationEmail.value = '';
    startEmailInput.readOnly = false;
    startEmailInput.removeAttribute('aria-readonly');
    if (clearInput) {
      startEmailInput.value = '';
      setStartEmailError('');
    }
    updateStartEmailRequiredMarker();
    forgetRememberedEmail();
    leaveCompactStatus();
  }

  function stopAutosave() {
    if (state.autosaveId) {
      clearInterval(state.autosaveId);
      state.autosaveId = null;
    }
  }

  function startAutosave() {
    stopAutosave();
    state.autosaveId = setInterval(async () => {
      if (!state.email || wizardSection.classList.contains('hidden')) {
        return;
      }
      try {
        await saveDraft(false);
      } catch (_err) {
        // visible on next manual action
      }
    }, 15000);
  }

  function clearErrors() {
    document.querySelectorAll('[data-error-for]').forEach((el) => {
      el.textContent = '';
    });
  }

  function showErrors(errors) {
    clearErrors();
    Object.keys(errors || {}).forEach((key) => {
      const el = document.querySelector('[data-error-for="' + key + '"]');
      if (el) {
        el.textContent = errors[key];
      }
    });
  }

  function clearWizardData() {
    applicationForm.reset();
    clearErrors();
    renderUploadInfo({});
    state.currentStep = 1;
    state.summaryMissingCount = 0;
    state.isSubmitting = false;
    if (submitLabel) {
      submitLabel.textContent = 'Verbindlich absenden';
    }
    if (submitSpinner) {
      submitSpinner.classList.add('hidden');
    }
    submitBtn.classList.remove('is-loading');
    applyFieldVisibility();
    refreshRequiredMarkers();
    updateProgress();
    Array.from(document.querySelectorAll('[data-upload-key]')).forEach((control) => {
      const fieldKey = control.getAttribute('data-upload-key');
      if (fieldKey) {
        updateUploadSelectionText(fieldKey);
      }
    });
  }

  function parseFieldKey(name) {
    const match = /^form_data\[(.+)\]$/.exec(String(name || ''));
    return match ? match[1] : '';
  }

  function isCheckboxTrue(value) {
    return ['1', 'on', 'true', true, 1].includes(value);
  }

  function parseBirthdateParts(value) {
    const match = /^(\d{4})-(\d{2})-(\d{2})$/.exec(String(value || '').trim());
    if (!match) {
      return null;
    }

    const year = Number(match[1]);
    const month = Number(match[2]);
    const day = Number(match[3]);
    const candidate = new Date(Date.UTC(year, month - 1, day));
    if (
      Number.isNaN(candidate.getTime()) ||
      candidate.getUTCFullYear() !== year ||
      candidate.getUTCMonth() !== month - 1 ||
      candidate.getUTCDate() !== day
    ) {
      return null;
    }

    return { year, month, day };
  }

  function deriveAdultFlagFromBirthdate(birthdateValue) {
    const parts = parseBirthdateParts(birthdateValue);
    if (!parts) {
      return '';
    }

    const now = new Date();
    const yearNow = now.getFullYear();
    const monthNow = now.getMonth() + 1;
    const dayNow = now.getDate();
    const isFutureBirthdate =
      parts.year > yearNow ||
      (parts.year === yearNow && (parts.month > monthNow || (parts.month === monthNow && parts.day > dayNow)));
    if (isFutureBirthdate) {
      return '';
    }

    let age = yearNow - parts.year;
    const hadBirthdayThisYear = monthNow > parts.month || (monthNow === parts.month && dayNow >= parts.day);
    if (!hadBirthdayThisYear) {
      age -= 1;
    }

    return age >= 18 ? '1' : '0';
  }

  function addComputedAgeFlags(data) {
    const adultFlag = deriveAdultFlagFromBirthdate(data.geburtsdatum || '');
    data.is_adult = adultFlag;
    data.is_minor = adultFlag === '' ? '' : adultFlag === '1' ? '0' : '1';
    return data;
  }

  function collectCurrentFormData() {
    const data = {};

    Array.from(applicationForm.elements).forEach((el) => {
      if (!el.name) {
        return;
      }

      const key = parseFieldKey(el.name);
      if (!key) {
        return;
      }

      if (el.type === 'checkbox') {
        data[key] = el.checked ? '1' : '0';
      } else {
        data[key] = el.value || '';
      }
    });

    return addComputedAgeFlags(data);
  }

  function evaluateFieldRule(rule, formData) {
    if (!rule || typeof rule !== 'object') {
      return false;
    }

    const depField = String(rule.field || '').trim();
    const depValue = String(rule.equals || '');
    if (depField === '') {
      return false;
    }

    return String(formData[depField] || '') === depValue;
  }

  function isFieldVisible(field, formData) {
    if (!field || typeof field !== 'object') {
      return true;
    }

    if (!field.visible_if || typeof field.visible_if !== 'object') {
      return true;
    }

    return evaluateFieldRule(field.visible_if, formData);
  }

  function hasFileValue(fieldKey) {
    const fileInput = applicationForm.querySelector('[name="' + fieldKey + '"]');
    const cameraInput = applicationForm.querySelector('[name="' + fieldKey + '__camera"]');
    const hasLocalSelection =
      (fileInput && fileInput.files && fileInput.files.length > 0) ||
      (cameraInput && cameraInput.files && cameraInput.files.length > 0);

    if (hasLocalSelection) {
      return true;
    }

    const storedUploads = state.uploads[fieldKey];
    return Array.isArray(storedUploads) && storedUploads.length > 0;
  }

  function isFieldCompleted(field, formData) {
    const key = String(field.key || '').trim();
    const type = String(field.type || 'text');
    if (key === '') {
      return false;
    }

    if (type === 'file') {
      return hasFileValue(key);
    }

    if (type === 'checkbox') {
      return isCheckboxTrue(formData[key]);
    }

    return String(formData[key] || '').trim() !== '';
  }

  function applyFieldVisibility() {
    const formData = collectCurrentFormData();

    fieldsByKey.forEach((field, key) => {
      const container = fieldContainersByKey.get(key);
      if (!container) {
        return;
      }

      const visible = isFieldVisible(field, formData);
      container.classList.toggle('field-hidden-by-rule', !visible);

      const controlElements = container.querySelectorAll('input, select, textarea');
      controlElements.forEach((el) => {
        el.disabled = !visible;
      });

      if (!visible) {
        const errorEl = container.querySelector('[data-error-for="' + key + '"]');
        if (errorEl) {
          errorEl.textContent = '';
        }
      }
    });
  }

  function refreshRequiredMarkers() {
    const formData = collectCurrentFormData();

    fieldsByKey.forEach((field, key) => {
      const container = fieldContainersByKey.get(key);
      if (!container) {
        return;
      }

      const markers = container.querySelectorAll('.required-mark-field');
      if (!markers.length) {
        return;
      }

      const visibleNow = isFieldVisible(field, formData);
      const requiredNow = isFieldRequired(field, formData);
      const completed = isFieldCompleted(field, formData);
      const hideMarker = !visibleNow || !requiredNow || completed;

      markers.forEach((marker) => {
        marker.classList.toggle('hidden', hideMarker);
      });
    });
  }

  function initRequiredMarkerTracking() {
    Array.from(applicationForm.elements).forEach((el) => {
      if (!el.name || !el.name.startsWith('form_data[')) {
        return;
      }
      el.addEventListener('blur', () => {
        applyFieldVisibility();
        refreshRequiredMarkers();
      });
      el.addEventListener('change', () => {
        applyFieldVisibility();
        refreshRequiredMarkers();
      });
    });
  }

  function isFieldRequired(field, formData) {
    if (!field || typeof field !== 'object') {
      return false;
    }

    if (!isFieldVisible(field, formData)) {
      return false;
    }

    if (field.required === true) {
      return true;
    }

    if (!field.required_if || typeof field.required_if !== 'object') {
      return false;
    }

    return evaluateFieldRule(field.required_if, formData);
  }

  function isFieldMissing(field, formData) {
    if (!isFieldRequired(field, formData)) {
      return false;
    }

    const key = String(field.key || '').trim();
    if (!key) {
      return false;
    }

    const type = String(field.type || 'text');
    if (type === 'file') {
      const uploadItems = state.uploads[key];
      return !Array.isArray(uploadItems) || uploadItems.length === 0;
    }

    if (type === 'checkbox') {
      return !isCheckboxTrue(formData[key]);
    }

    return String(formData[key] || '').trim() === '';
  }

  function resolveSelectLabel(field, value) {
    if (!Array.isArray(field.options)) {
      return value;
    }

    const matched = field.options.find((option) => {
      return option && String(option.value || '') === String(value);
    });

    if (!matched) {
      return value;
    }

    return String(matched.label || value);
  }

  function fieldDisplayValue(field, formData) {
    const key = String(field.key || '').trim();
    const type = String(field.type || 'text');

    if (!key) {
      return '';
    }

    if (type === 'file') {
      const uploadItems = state.uploads[key];
      if (!Array.isArray(uploadItems) || uploadItems.length === 0) {
        return '';
      }
      return uploadItems
        .map((item) => {
          if (!item || typeof item !== 'object') {
            return '';
          }
          return String(item.original_filename || item.stored_filename || '').trim();
        })
        .filter(Boolean)
        .join(', ');
    }

    if (type === 'checkbox') {
      return isCheckboxTrue(formData[key]) ? 'Ja' : 'Nein';
    }

    const rawValue = String(formData[key] || '').trim();
    if (rawValue === '') {
      return '';
    }

    if (type === 'select') {
      return resolveSelectLabel(field, rawValue);
    }

    return rawValue;
  }

  function renderSummary() {
    if (!summarySection || !summaryContent || !summaryMissingNotice) {
      return;
    }

    const formData = collectCurrentFormData();
    const fragment = document.createDocumentFragment();
    let missingCount = 0;

    const introCard = document.createElement('div');
    introCard.className = 'summary-step-card';
    const introTitle = document.createElement('h4');
    introTitle.textContent = 'Startdaten';
    introCard.appendChild(introTitle);

    const emailRow = document.createElement('div');
    emailRow.className = 'summary-item';
    const emailLabel = document.createElement('div');
    emailLabel.className = 'summary-item-label';
    emailLabel.textContent = 'E-Mail';
    const emailValue = document.createElement('div');
    emailValue.className = 'summary-item-value';
    emailValue.textContent = state.email || 'Nicht gesetzt';
    emailRow.appendChild(emailLabel);
    emailRow.appendChild(emailValue);
    introCard.appendChild(emailRow);
    fragment.appendChild(introCard);

    schemaSteps.forEach((step, stepIndex) => {
      const allFields = Array.isArray(step.fields) ? step.fields.filter((field) => field && typeof field === 'object') : [];
      const fields = allFields.filter((field) => isFieldVisible(field, formData));
      if (fields.length === 0) {
        return;
      }

      const card = document.createElement('div');
      card.className = 'summary-step-card';

      const title = document.createElement('h4');
      title.textContent = 'Schritt ' + String(stepIndex + 1) + ': ' + String(step.title || '');
      card.appendChild(title);

      fields.forEach((field) => {
        const required = isFieldRequired(field, formData);
        const missing = isFieldMissing(field, formData);
        if (missing) {
          missingCount += 1;
        }

        const row = document.createElement('div');
        row.className = 'summary-item';
        if (required) {
          row.classList.add('summary-item-required');
        }
        if (missing) {
          row.classList.add('summary-item-missing');
        }

        const labelEl = document.createElement('div');
        labelEl.className = 'summary-item-label';
        labelEl.textContent = String(field.label || field.key || 'Feld');

        if (required) {
          const requiredBadge = document.createElement('span');
          requiredBadge.className = 'summary-badge summary-badge-required';
          requiredBadge.textContent = 'Pflichtfeld';
          labelEl.appendChild(requiredBadge);
        }

        if (missing) {
          const missingBadge = document.createElement('span');
          missingBadge.className = 'summary-badge summary-badge-missing';
          missingBadge.textContent = '! Pflichtfeld fehlt';
          labelEl.appendChild(missingBadge);
        }

        const valueEl = document.createElement('div');
        valueEl.className = 'summary-item-value';
        const value = fieldDisplayValue(field, formData);
        if (value !== '') {
          valueEl.textContent = value;
        } else {
          valueEl.textContent = String(field.type || '') === 'file' ? 'Keine Datei hochgeladen' : 'Nicht ausgefüllt';
          valueEl.classList.add('summary-item-value-empty');
          if (missing) {
            valueEl.classList.add('summary-item-value-missing');
          }
        }

        row.appendChild(labelEl);
        row.appendChild(valueEl);
        card.appendChild(row);
      });

      fragment.appendChild(card);
    });

    summaryContent.innerHTML = '';
    summaryContent.appendChild(fragment);

    state.summaryMissingCount = missingCount;
    if (missingCount > 0) {
      summaryMissingNotice.classList.remove('hidden');
      summaryMissingNotice.classList.add('summary-missing-warning');
      summaryMissingNotice.textContent = '! Es fehlen noch ' + String(missingCount) + ' Pflichtfelder. Bitte korrigieren Sie die rot markierten Einträge.';
    } else {
      summaryMissingNotice.classList.remove('hidden');
      summaryMissingNotice.classList.remove('summary-missing-warning');
      summaryMissingNotice.textContent = 'Alle Pflichtfelder sind ausgefüllt.';
    }
  }

  function updateProgress() {
    const isSummary = state.currentStep === state.summaryStep;

    if (isSummary) {
      progress.textContent = 'Zusammenfassung (Schritt ' + String(state.summaryStep) + ' von ' + String(state.summaryStep) + ')';
    } else {
      progress.textContent = 'Schritt ' + String(state.currentStep) + ' von ' + String(state.totalSteps);
    }

    stepElements.forEach((el) => {
      const step = Number(el.getAttribute('data-step'));
      el.classList.toggle('hidden', step !== state.currentStep);
    });

    if (summarySection) {
      summarySection.classList.toggle('hidden', !isSummary);
      if (isSummary) {
        renderSummary();
      }
    }

    prevBtn.disabled = state.isSubmitting || state.currentStep === 1;

    nextBtn.textContent = state.currentStep === state.totalSteps ? 'Zur Zusammenfassung' : 'Weiter';
    nextBtn.classList.toggle('hidden', state.currentStep >= state.summaryStep);
    nextBtn.disabled = state.isSubmitting;

    submitBtn.classList.toggle('hidden', !isSummary);
    submitBtn.disabled = state.isSubmitting;
  }

  function fillFormData(data) {
    Object.keys(data || {}).forEach((key) => {
      const field = applicationForm.querySelector('[name="form_data[' + key + ']"]');
      if (!field) {
        return;
      }

      if (field.type === 'checkbox') {
        field.checked = ['1', 'on', 'true', true].includes(data[key]);
      } else {
        field.value = data[key] || '';
      }
    });
    applyFieldVisibility();
    refreshRequiredMarkers();
  }

  function renderUploadInfo(uploads) {
    state.uploads = uploads && typeof uploads === 'object' ? uploads : {};

    document.querySelectorAll('[data-upload-list]').forEach((el) => {
      el.innerHTML = '';
    });

    Object.keys(state.uploads).forEach((field) => {
      const target = document.querySelector('[data-upload-list="' + field + '"]');
      if (!target || !Array.isArray(state.uploads[field])) {
        return;
      }

      state.uploads[field].forEach((item) => {
        const div = document.createElement('div');
        div.className = 'upload-item';
        div.textContent = item.original_filename + ' (' + item.uploaded_at + ')';
        target.appendChild(div);
      });
    });
    applyFieldVisibility();
    refreshRequiredMarkers();
  }

  function updateUploadSelectionText(fieldKey) {
    const target = document.querySelector('[data-upload-selected="' + fieldKey + '"]');
    if (!target) {
      return;
    }

    const fileInput = applicationForm.querySelector('[name="' + fieldKey + '"]');
    const cameraInput = applicationForm.querySelector('[name="' + fieldKey + '__camera"]');

    let label = 'Keine Datei gewählt';
    if (fileInput && fileInput.files && fileInput.files[0]) {
      label = 'Ausgewählt: ' + fileInput.files[0].name;
    }
    if (cameraInput && cameraInput.files && cameraInput.files[0]) {
      label = 'Ausgewählt: ' + cameraInput.files[0].name + ' (Foto)';
    }

    target.textContent = label;
    refreshRequiredMarkers();
  }

  async function triggerInstantUpload() {
    if (!state.email || wizardSection.classList.contains('hidden')) {
      return;
    }

    setDraftStatus('Datei wird hochgeladen ...', false);
    try {
      await saveDraft(true);
      setFeedback('', false);
      refreshRequiredMarkers();
      if (state.currentStep === state.summaryStep) {
        renderSummary();
      }
    } catch (err) {
      const msg = (err.payload && err.payload.message) || err.message || 'Upload fehlgeschlagen.';
      setDraftStatus('Upload fehlgeschlagen', true);
      setFeedback(msg, true);
    }
  }

  function initUploadControls() {
    const controls = Array.from(document.querySelectorAll('[data-upload-key]'));

    controls.forEach((control) => {
      const fieldKey = control.getAttribute('data-upload-key') || '';
      if (!fieldKey) {
        return;
      }

      const fileInput = applicationForm.querySelector('[name="' + fieldKey + '"]');
      const cameraInput = applicationForm.querySelector('[name="' + fieldKey + '__camera"]');

      if (fileInput) {
        fileInput.addEventListener('change', async () => {
          if (fileInput.files && fileInput.files[0] && cameraInput) {
            cameraInput.value = '';
          }
          updateUploadSelectionText(fieldKey);
          if (fileInput.files && fileInput.files[0]) {
            await triggerInstantUpload();
          }
        });
      }

      if (cameraInput) {
        cameraInput.addEventListener('change', async () => {
          if (cameraInput.files && cameraInput.files[0] && fileInput) {
            fileInput.value = '';
          }
          updateUploadSelectionText(fieldKey);
          if (cameraInput.files && cameraInput.files[0]) {
            await triggerInstantUpload();
          }
        });
      }

      updateUploadSelectionText(fieldKey);
    });
  }

  async function postForm(url, formData) {
    const response = await fetch(url, {
      method: 'POST',
      body: formData,
      credentials: 'same-origin',
      headers: { 'X-Requested-With': 'XMLHttpRequest' },
    });

    const payload = await response.json();
    if (!response.ok || payload.ok === false) {
      const err = new Error(payload.message || 'Anfrage fehlgeschlagen');
      err.payload = payload;
      throw err;
    }

    return payload;
  }

  function collectPayload(includeFiles) {
    const fd = new FormData();
    fd.append('csrf', boot.csrf);
    fd.append('email', state.email);
    fd.append('step', String(Math.min(state.currentStep, state.totalSteps)));
    fd.append('website', '');

    Array.from(applicationForm.elements).forEach((el) => {
      if (!el.name) {
        return;
      }
      if (el.disabled) {
        return;
      }
      if (!el.name.startsWith('form_data[')) {
        return;
      }

      if (el.type === 'checkbox') {
        fd.append(el.name, el.checked ? '1' : '0');
      } else {
        fd.append(el.name, el.value || '');
      }
    });

    if (includeFiles) {
      Array.from(applicationForm.querySelectorAll('input[type="file"]')).forEach((input) => {
        if (input.disabled) {
          return;
        }
        if (input.files && input.files[0]) {
          fd.append(input.name, input.files[0]);
        }
      });
    }

    return fd;
  }

  async function loadDraft(email) {
    const fd = new FormData();
    fd.append('csrf', boot.csrf);
    fd.append('email', email);
    fd.append('website', '');
    return postForm(appUrl('api/load-draft.php'), fd);
  }

  async function resetSavedData(email) {
    const fd = new FormData();
    fd.append('csrf', boot.csrf);
    fd.append('email', email);
    fd.append('website', '');
    return postForm(appUrl('api/reset.php'), fd);
  }

  async function saveDraft(includeFiles) {
    const payload = collectPayload(includeFiles);
    const response = await postForm(appUrl('api/save-draft.php'), payload);

    if (response.upload_errors && Object.keys(response.upload_errors).length > 0) {
      showErrors(response.upload_errors);
      setDraftStatus('Uploadfehler', true);
      setFeedback('Einige Dateien konnten nicht gespeichert werden.', true);
    } else {
      const ts = formatTimestamp(response.updated_at);
      setDraftStatus('Gespeichert: ' + (ts || 'gerade eben'), false);
    }

    if (response.uploads) {
      renderUploadInfo(response.uploads);
    }

    if (includeFiles) {
      Array.from(applicationForm.querySelectorAll('input[type="file"]')).forEach((input) => {
        input.value = '';
      });
      Array.from(document.querySelectorAll('[data-upload-key]')).forEach((control) => {
        const fieldKey = control.getAttribute('data-upload-key');
        if (fieldKey) {
          updateUploadSelectionText(fieldKey);
        }
      });
    }

    return response;
  }

  function setSubmitting(isSubmitting) {
    state.isSubmitting = isSubmitting;
    submitBtn.classList.toggle('is-loading', isSubmitting);
    if (submitSpinner) {
      submitSpinner.classList.toggle('hidden', !isSubmitting);
    }
    if (submitLabel) {
      submitLabel.textContent = isSubmitting ? 'Wird gesendet ...' : 'Verbindlich absenden';
    }
    updateProgress();
  }

  async function submitApplication() {
    setSubmitting(true);
    setFeedback('Absenden gestartet ...', false);

    try {
      const payload = collectPayload(true);
      const response = await postForm(appUrl('api/submit.php'), payload);
      clearErrors();
      setDraftStatus('Abgeschlossen', false);
      setFeedback('Antrag erfolgreich abgeschlossen. Vielen Dank.', false);
      setSubmitting(false);

      submitBtn.disabled = true;
      nextBtn.disabled = true;
      prevBtn.disabled = true;
      if (submitLabel) {
        submitLabel.textContent = 'Abgesendet';
      }
      return response;
    } catch (err) {
      setSubmitting(false);
      throw err;
    }
  }

  function validateStartEmail(showError) {
    const email = normalizeEmail(startEmailInput.value || '');
    const valid = isValidEmail(email);

    startEmailInput.value = email;
    if (valid) {
      setStartEmailError('');
      startEmailInput.setCustomValidity('');
      updateStartEmailRequiredMarker();
      return true;
    }

    const message = 'Bitte eine gültige E-Mail-Adresse eingeben.';
    startEmailInput.setCustomValidity(message);
    if (showError) {
      setStartEmailError(message);
      setFeedback(message, true);
    }
    updateStartEmailRequiredMarker();
    return false;
  }

  async function startProcess(rawEmail) {
    const email = normalizeEmail(rawEmail);
    if (!isValidEmail(email)) {
      const message = 'Bitte eine gültige E-Mail-Adresse eingeben.';
      setStartEmailError(message);
      setFeedback(message, true);
      startEmailInput.focus();
      return;
    }

    startEmailInput.value = email;
    setStartEmailError('');
    startEmailInput.setCustomValidity('');
    updateStartEmailRequiredMarker();

    if (startSubmitBtn) {
      startSubmitBtn.disabled = true;
    }

    try {
      const result = await loadDraft(email);
      lockEmail(email);

      if (result.already_submitted) {
        wizardSection.classList.add('hidden');
        setDraftStatus('Antrag bereits abgeschlossen', false);
        setFeedback(boot.contactEmail ? 'Kontakt: ' + boot.contactEmail : '', false);
        stopAutosave();
        return;
      }

      wizardSection.classList.remove('hidden');
      fillFormData(result.data || {});
      renderUploadInfo(result.uploads || {});

      state.currentStep = Math.min(Math.max(Number(result.step || 1), 1), state.totalSteps);
      updateProgress();
      startAutosave();

      const loadedAt = formatTimestamp(result.updated_at);
      if (loadedAt) {
        setDraftStatus('Entwurf geladen: ' + loadedAt, false);
      } else {
        setDraftStatus('Neuer Entwurf gestartet', false);
      }
      setFeedback('', false);
    } catch (err) {
      const msg = (err.payload && err.payload.message) || err.message || 'Laden fehlgeschlagen.';
      setFeedback(msg, true);
    } finally {
      if (startSubmitBtn) {
        startSubmitBtn.disabled = false;
      }
    }
  }

  startForm.addEventListener('submit', async (event) => {
    event.preventDefault();
    if (!validateStartEmail(true)) {
      startEmailInput.focus();
      return;
    }
    await startProcess(startEmailInput.value || '');
  });

  startEmailInput.addEventListener('input', () => {
    if (startEmailInput.readOnly) {
      return;
    }
    if (startEmailInput.value.trim() === '') {
      setStartEmailError('');
      startEmailInput.setCustomValidity('');
      updateStartEmailRequiredMarker();
      return;
    }
    validateStartEmail(false);
  });

  startEmailInput.addEventListener('blur', () => {
    if (startEmailInput.readOnly) {
      return;
    }
    if (startEmailInput.value.trim() === '') {
      updateStartEmailRequiredMarker();
      return;
    }
    validateStartEmail(true);
  });

  resetDataBtn.addEventListener('click', async () => {
    if (!state.email) {
      setFeedback('Keine aktive E-Mail vorhanden.', true);
      return;
    }

    const confirmed = window.confirm('Alle gespeicherten Daten zu dieser E-Mail endgültig löschen und neu starten?');
    if (!confirmed) {
      return;
    }

    try {
      await resetSavedData(state.email);
      stopAutosave();
      wizardSection.classList.add('hidden');
      clearWizardData();
      unlockEmail(true);
      setFeedback('Alle gespeicherten Daten wurden gelöscht. Sie können neu starten.', false);
      startEmailInput.focus();
    } catch (err) {
      const msg = (err.payload && err.payload.message) || err.message || 'Löschen fehlgeschlagen.';
      setFeedback(msg, true);
    }
  });

  prevBtn.addEventListener('click', async () => {
    if (state.currentStep <= 1 || state.isSubmitting) {
      return;
    }

    try {
      if (state.currentStep <= state.totalSteps) {
        await saveDraft(false);
      }
      state.currentStep -= 1;
      updateProgress();
    } catch (err) {
      const msg = (err.payload && err.payload.message) || err.message;
      setFeedback(msg, true);
    }
  });

  nextBtn.addEventListener('click', async () => {
    if (state.currentStep >= state.summaryStep || state.isSubmitting) {
      return;
    }

    try {
      await saveDraft(false);
      state.currentStep += 1;
      updateProgress();
    } catch (err) {
      const msg = (err.payload && err.payload.message) || err.message;
      setFeedback(msg, true);
    }
  });

  submitBtn.addEventListener('click', async () => {
    if (state.isSubmitting) {
      return;
    }

    renderSummary();
    if (state.summaryMissingCount > 0) {
      setFeedback('Bitte zuerst alle rot markierten Pflichtfelder ausfüllen.', true);
      return;
    }

    try {
      await submitApplication();
    } catch (err) {
      const payload = err.payload || {};
      if (payload.errors) {
        showErrors(payload.errors);
      }
      const msg = payload.message || err.message || 'Absenden fehlgeschlagen.';
      setFeedback(msg, true);
      if (payload.already_submitted) {
        wizardSection.classList.add('hidden');
        setDraftStatus('Antrag bereits abgeschlossen', false);
      }
    }
  });

  function initializeAfterDisclaimer() {
    disclaimerSection.classList.add('hidden');
    startSection.classList.remove('hidden');

    const rememberedEmail = normalizeEmail(getRememberedEmail());
    if (rememberedEmail !== '' && isValidEmail(rememberedEmail)) {
      startEmailInput.value = rememberedEmail;
      setFeedback('', false);
      startProcess(rememberedEmail);
    }
  }

  if (disclaimerReadCheckbox) {
    disclaimerReadCheckbox.addEventListener('change', updateDisclaimerAcceptanceState);
  }

  if (acceptDisclaimerBtn) {
    acceptDisclaimerBtn.addEventListener('click', () => {
      if (!disclaimerReadCheckbox || !disclaimerReadCheckbox.checked) {
        setDisclaimerError('Bitte lesen und bestätigen Sie den Hinweis.');
        return;
      }
      setDisclaimerError('');
      initializeAfterDisclaimer();
    });
  }

  updateDisclaimerAcceptanceState();
  disclaimerSection.classList.remove('hidden');
  startSection.classList.add('hidden');

  initUploadControls();
  initRequiredMarkerTracking();
  applyFieldVisibility();
  refreshRequiredMarkers();
  updateStartEmailRequiredMarker();
  updateProgress();
})();