(function () {
  var dataElement = document.getElementById('slide-editor-data');
  if (!dataElement) {
    return;
  }

  var slideEditorData = {};
  try {
    slideEditorData = JSON.parse(dataElement.getAttribute('data-json') || dataElement.textContent || '{}') || {};
  } catch (_error) {
    slideEditorData = {};
  }

  var templates = Array.isArray(slideEditorData.templates) ? slideEditorData.templates : [];
  var existingTemplateId = slideEditorData.existingTemplateId !== undefined ? slideEditorData.existingTemplateId : null;
  var existingContent = slideEditorData.existingContent || {};
  var templateSelect = document.getElementById('template-select');
  var templateFields = document.getElementById('template-fields');
  var slideForm = document.getElementById('slide-form');
  var slidePreviewMeta = document.getElementById('slide-preview-meta');
  var slidePreviewStage = document.getElementById('slide-preview-stage');
  var slidePreviewBackground = document.getElementById('slide-preview-background');
  var slidePreviewEmpty = document.getElementById('slide-preview-empty');
  var slidePreviewOverlay = document.getElementById('slide-preview-overlay');
  var editorInstances = new Map();
  var submitting = false;

  function escapeHtml(value) {
    return String(value ?? '')
      .replace(/&/g, '&')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/"/g, '&quot;')
      .replace(/'/g, '&#39;');
  }

  function getTemplateById(id) {
    return templates.find(function (item) { return Number(item.id) === Number(id); }) || null;
  }

  function getCurrentRegionValue(region) {
    var current = existingContent[region.region_key];
    return current && current.value !== undefined ? current.value : '';
  }

  function normalizeEditorData(value) {
    var raw = String(value || '');
    if (!raw) {
      return { time: Date.now(), blocks: [] };
    }
    try {
      var parsed = JSON.parse(raw);
      if (parsed && Array.isArray(parsed.blocks)) {
        return parsed;
      }
    } catch (_error) {
      // fall through to legacy HTML/plain text
    }
    return {
      time: Date.now(),
      blocks: [{
        type: 'paragraph',
        data: { text: raw }
      }]
    };
  }

  function sanitizePreviewHtml(html) {
    var output = String(html || '');
    output = output.replace(/<script[\s\S]*?<\/script>/gi, '');
    output = output.replace(/<style[\s\S]*?<\/style>/gi, '');
    return output.replace(/<[^>]+>/g, function (tag) {
      var match = tag.match(/^<\s*(\/?)\s*([a-z0-9]+)(?:\s[^>]*)?>$/i);
      if (!match) {
        return '';
      }
      var closing = Boolean(match[1]);
      var name = String(match[2] || '').toLowerCase();
      var allowed = ['b', 'strong', 'i', 'em', 'u', 'br', 'p', 'div', 'ul', 'ol', 'li', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'pre', 'code', 'table', 'thead', 'tbody', 'tr', 'th', 'td'];
      if (allowed.indexOf(name) === -1) {
        return '';
      }
      if (name === 'br') {
        return '<br>';
      }
      return closing ? '</' + name + '>' : '<' + name + '>';
    });
  }

  function renderPreviewListItem(item, tag) {
    if (item && typeof item === 'object') {
      var content = item.content !== undefined ? item.content : (item.text !== undefined ? item.text : item.value !== undefined ? item.value : '');
      var children = Array.isArray(item.items) ? item.items : Array.isArray(item.subItems) ? item.subItems : Array.isArray(item.children) ? item.children : [];
      var nested = children.length ? '<' + tag + ' style="list-style-type:' + (tag === 'ol' ? 'decimal' : 'disc') + ';padding-left:1.4em;">' + children.map(function (child) { return renderPreviewListItem(child, tag); }).join('') + '</' + tag + '>' : '';
      return '<li>' + sanitizePreviewHtml(content || '') + nested + '</li>';
    }
    return '<li>' + sanitizePreviewHtml(item || '') + '</li>';
  }

  function renderPreviewTable(data) {
    var rows = Array.isArray(data.content) ? data.content : Array.isArray(data.rows) ? data.rows : [];
    if (!rows.length) {
      return '';
    }
    var hasHeadings = Boolean(data.withHeadings);
    var body = rows.map(function (row, rowIndex) {
      var cells = Array.isArray(row) ? row : [];
      var cellTag = hasHeadings && rowIndex === 0 ? 'th' : 'td';
      var cellAttrs = cellTag === 'th' ? ' scope="col"' : '';
      return '<tr>' + cells.map(function (cell) {
        return '<' + cellTag + cellAttrs + '>' + sanitizePreviewHtml(cell || '') + '</' + cellTag + '>';
      }).join('') + '</tr>';
    }).join('');
    return '<table class="slide-preview-table">' + body + '</table>';
  }

  function renderPreviewBlock(block) {
    if (!block || !block.type || !block.data) {
      return '';
    }
    if (block.type === 'header') {
      var level = Math.max(1, Math.min(6, Number(block.data.level || 2)));
      return '<h' + level + '>' + sanitizePreviewHtml(block.data.text || '') + '</h' + level + '>';
    }
    if (block.type === 'list') {
      var tag = block.data.style === 'ordered' ? 'ol' : 'ul';
      var items = Array.isArray(block.data.items) ? block.data.items : [];
      return '<' + tag + ' style="list-style-type:' + (tag === 'ol' ? 'decimal' : 'disc') + ';padding-left:1.4em;">' + items.map(function (item) { return renderPreviewListItem(item, tag); }).join('') + '</' + tag + '>';
    }
    if (block.type === 'delimiter') {
      return '<hr />';
    }
    if (block.type === 'code') {
      return '<pre><code>' + sanitizePreviewHtml(block.data.code || '') + '</code></pre>';
    }
    if (block.type === 'table') {
      return renderPreviewTable(block.data);
    }
    if (block.type === 'paragraph') {
      return '<p>' + sanitizePreviewHtml(block.data.text || '') + '</p>';
    }
    return '';
  }

  function renderPreviewText(value) {
    var raw = String(value || '');
    if (!raw) {
      return '<div class="slide-preview-placeholder">Empty text</div>';
    }
    try {
      var parsed = JSON.parse(raw);
      if (parsed && Array.isArray(parsed.blocks)) {
        return parsed.blocks.map(renderPreviewBlock).join('');
      }
    } catch (_error) {
      // fall through to raw text
    }
    return '<p>' + sanitizePreviewHtml(raw) + '</p>';
  }

  function renderPreviewTextRegion(region, value, style, scale) {
    var fontFamily = style.font_family ? 'font-family:' + escapeHtml(style.font_family) + ';' : '';
    var fontSize = style.font_size ? 'font-size:' + Math.max(1, Math.round(Number(style.font_size) * scale)) + 'px;' : '';
    var color = style.font_color ? 'color:' + escapeHtml(style.font_color) + ';' : '';
    return '<div class="slide-preview-text-content" style="' + fontFamily + fontSize + color + '">' + renderPreviewText(value) + '</div>';
  }

  function renderPreviewWebpageRegion(value) {
    var src = String(value || '').trim();
    if (!src) {
      return '<div class="slide-preview-placeholder">Webpage</div>';
    }
    return '<iframe class="slide-preview-webpage-frame" src="' + escapeHtml(src) + '" title="Webpage preview" loading="eager" referrerpolicy="no-referrer" scrolling="no"></iframe>';
  }

  function renderPreviewHtmlRegion(value) {
    var html = String(value || '').trim();
    if (!html) {
      return '<div class="slide-preview-placeholder">HTML</div>';
    }
    return '<iframe class="slide-preview-html-frame" sandbox="" scrolling="no" srcdoc="<!doctype html><html><head><style>html,body{margin:0;width:100%;height:100%;overflow:hidden;background:transparent;}</style></head><body>' + escapeHtml(html) + '</body></html>" title="HTML preview" loading="eager"></iframe>';
  }

  function destroyEditors() {
    editorInstances.forEach(function (editor) {
      if (editor && typeof editor.destroy === 'function') {
        editor.destroy();
      }
    });
    editorInstances.clear();
  }

  function getEditorHiddenInput(regionId) {
    var card = templateFields.querySelector('[data-region-id="' + regionId + '"]');
    return card ? card.querySelector('input[type="hidden"][name="region_text_' + regionId + '"]') : null;
  }

  function getCurrentTextStyle(region) {
    var current = existingContent[region.region_key] || {};
    return {
      font_family: String(current.font_family || region.font_family || 'Arial').trim() || 'Arial',
      font_size: Math.max(8, Number(current.font_size || 24)),
      font_color: String(current.font_color || region.font_color || '#000000').trim() || '#000000'
    };
  }

  function getTextStyleFromCard(card, region) {
    var familyInput = card.querySelector('[name="region_font_family_' + region.id + '"]');
    var sizeInput = card.querySelector('[name="region_font_size_' + region.id + '"]');
    var colorInput = card.querySelector('[name="region_font_color_' + region.id + '"]');
    var current = getCurrentTextStyle(region);
    return {
      font_family: String(familyInput ? familyInput.value : current.font_family).trim() || current.font_family,
      font_size: Math.max(8, Number(sizeInput ? sizeInput.value : current.font_size)),
      font_color: String(colorInput ? colorInput.value : current.font_color).trim() || current.font_color
    };
  }

  function getSelectedTemplate() {
    return templates.find(function (item) { return Number(item.id) === Number(templateSelect.value); }) || null;
  }

  function clearImagePreviewUrls() {
    templateFields.querySelectorAll('input[type="file"][name^="region_image_"]').forEach(function (input) {
      if (input.dataset.previewUrl) {
        URL.revokeObjectURL(input.dataset.previewUrl);
        delete input.dataset.previewUrl;
      }
    });
  }

  function getRegionBox(region, stageRect, canvasWidth, canvasHeight) {
    return {
      left: (Number(region.x || 0) / canvasWidth) * stageRect.width,
      top: (Number(region.y || 0) / canvasHeight) * stageRect.height,
      width: (Number(region.width || 0) / canvasWidth) * stageRect.width,
      height: (Number(region.height || 0) / canvasHeight) * stageRect.height
    };
  }

  function renderPreview() {
    var template = getSelectedTemplate();
    if (!template) {
      slidePreviewMeta.textContent = 'Select a template to preview the slide.';
      slidePreviewBackground.style.display = 'none';
      slidePreviewEmpty.style.display = 'flex';
      slidePreviewEmpty.textContent = 'Select a template to preview the slide.';
      slidePreviewOverlay.innerHTML = '';
      slidePreviewStage.style.aspectRatio = '16 / 9';
      return;
    }

    var canvasWidth = Math.max(1, Number(template.canvas_size_width || 1920));
    var canvasHeight = Math.max(1, Number(template.canvas_size_height || 1080));
    slidePreviewStage.style.aspectRatio = canvasWidth + ' / ' + canvasHeight;
    slidePreviewMeta.textContent = template.name + ' • ' + canvasWidth + 'x' + canvasHeight;
    if (!(template.regions || []).length) {
      slidePreviewEmpty.style.display = 'flex';
      slidePreviewEmpty.textContent = 'This template has no regions.';
      slidePreviewBackground.style.display = template.background_image_path ? 'block' : 'none';
      slidePreviewBackground.src = template.background_image_path || '';
      slidePreviewOverlay.innerHTML = '';
      return;
    }

    slidePreviewEmpty.style.display = 'none';
    slidePreviewBackground.style.display = template.background_image_path ? 'block' : 'none';
    slidePreviewBackground.src = template.background_image_path || '';

    var stageRect = slidePreviewStage.getBoundingClientRect();
    var scale = Math.min(stageRect.width / canvasWidth, stageRect.height / canvasHeight) || 1;
    var regions = template.regions || [];
    slidePreviewOverlay.innerHTML = regions.map(function (region) {
      var box = getRegionBox(region, stageRect, canvasWidth, canvasHeight);
      var card = templateFields.querySelector('[data-region-id="' + region.id + '"]');
      var hiddenInput = card && card.querySelector('input[type="hidden"][name="region_text_' + region.id + '"]');
      var htmlInput = card && card.querySelector('textarea[name="region_html_' + region.id + '"]');
      var imageHidden = card && card.querySelector('input[type="hidden"][name="existing_region_image_' + region.id + '"]');
      var imageFileInput = card && card.querySelector('input[type="file"][name="region_image_' + region.id + '"]');
      var webpageInput = card && card.querySelector('input[type="url"][name="region_webpage_' + region.id + '"]');
      var value = region.region_type === 'image'
        ? ((imageFileInput && imageFileInput.dataset.previewUrl) ? imageFileInput.dataset.previewUrl : (imageHidden ? imageHidden.value : ''))
        : region.region_type === 'webpage'
          ? (webpageInput ? webpageInput.value : '')
          : region.region_type === 'html'
            ? (htmlInput ? htmlInput.value : '')
          : (hiddenInput ? hiddenInput.value : '');
      var style = region.region_type === 'image'
        ? null
        : region.region_type === 'webpage'
          ? null
          : region.region_type === 'html'
            ? null
          : getTextStyleFromCard(card, region);
      var content = region.region_type === 'image'
        ? (value ? '<img class="slide-preview-image" src="' + escapeHtml(value) + '" alt="" />' : '<div class="slide-preview-placeholder">Image</div>')
        : region.region_type === 'webpage'
          ? renderPreviewWebpageRegion(value)
          : region.region_type === 'html'
            ? renderPreviewHtmlRegion(value)
          : renderPreviewTextRegion(region, value, style, scale);
      var selected = region.region_type === 'image'
        ? ' slide-preview-image-region'
        : region.region_type === 'webpage'
          ? ' slide-preview-webpage-region'
          : region.region_type === 'html'
            ? ' slide-preview-html-region'
          : ' slide-preview-text-region';
      return '<div class="slide-preview-region' + selected + '" style="left:' + box.left + 'px;top:' + box.top + 'px;width:' + box.width + 'px;height:' + box.height + 'px;">' + content + '</div>';
    }).join('');
  }

  function renderTextRegion(region) {
    var current = getCurrentRegionValue(region);
    var style = getCurrentTextStyle(region);
    var fontChoices = [
      'Arial',
      'Courier New',
      'Garamond',
      'Georgia',
      'Helvetica',
      'Impact',
      'Lucida Console',
      'Palatino',
      'Tahoma',
      'Times New Roman',
      'Trebuchet MS',
      'Verdana'
    ];
    return '' +
      '<div class="card template-field-card" data-region-id="' + region.id + '">' +
        '<div class="template-field-head">' +
          '<strong>' + escapeHtml(region.label) + '</strong>' +
          '<span class="chip">Text</span>' +
        '</div>' +
        '<div class="row template-text-style-row">' +
          '<label style="flex: 1;">Font style' +
            '<select name="region_font_family_' + region.id + '">' + fontChoices.map(function (font) {
              return '<option value="' + escapeHtml(font) + '"' + (style.font_family === font ? ' selected' : '') + '>' + escapeHtml(font) + '</option>';
            }).join('') + '</select>' +
          '</label>' +
          '<label style="width: 120px;">Size' +
            '<input type="number" name="region_font_size_' + region.id + '" min="8" max="180" step="1" value="' + escapeHtml(style.font_size) + '" />' +
          '</label>' +
          '<label style="width: 140px;">Color' +
            '<input type="color" name="region_font_color_' + region.id + '" value="' + escapeHtml(style.font_color) + '" />' +
          '</label>' +
        '</div>' +
        '<div class="editorjs-holder" id="editorjs-' + region.id + '" data-region-id="' + region.id + '"></div>' +
        '<input type="hidden" name="region_text_' + region.id + '" value="' + escapeHtml(current) + '" />' +
      '</div>';
  }

  function renderWebpageRegion(region) {
    var current = getCurrentRegionValue(region);
    return '' +
        '<div class="card template-field-card" data-region-id="' + region.id + '">' +
          '<div class="template-field-head">' +
            '<strong>' + escapeHtml(region.label) + '</strong>' +
            '<span class="chip">Webpage</span>' +
          '</div>' +
          '<label style="display:block; margin-top:12px;">Webpage URL' +
            '<input type="url" name="region_webpage_' + region.id + '" value="' + escapeHtml(current) + '" placeholder="https://example.com" />' +
          '</label>' +
          '<div class="muted slide-image-file">The webpage will be loaded in an iframe.</div>' +
        '</div>';
  }

  function renderHtmlRegion(region) {
    var current = getCurrentRegionValue(region);
    return '' +
        '<div class="card template-field-card" data-region-id="' + region.id + '">' +
          '<div class="template-field-head">' +
            '<strong>' + escapeHtml(region.label) + '</strong>' +
            '<span class="chip">HTML</span>' +
          '</div>' +
          '<label style="display:block; margin-top:12px;">HTML content' +
            '<textarea name="region_html_' + region.id + '" rows="10" placeholder="<div>Hello</div>">' + escapeHtml(current) + '</textarea>' +
          '</label>' +
          '<div class="muted slide-image-file">HTML is rendered in a sandboxed iframe preview.</div>' +
        '</div>';
  }

  function renderImageRegion(region) {
    var current = getCurrentRegionValue(region);
    return '' +
      '<div class="card template-field-card" data-region-id="' + region.id + '">' +
        '<div class="template-field-head">' +
          '<strong>' + escapeHtml(region.label) + '</strong>' +
          '<span class="chip">Image</span>' +
        '</div>' +
        '<label style="display:block; margin-top:12px;">Image file' +
          '<input type="file" name="region_image_' + region.id + '" accept="image/*" />' +
        '</label>' +
        '<input type="hidden" name="existing_region_image_' + region.id + '" value="' + escapeHtml(current) + '" />' +
        (current
          ? '<div class="muted slide-image-file">Current: <a href="' + escapeHtml(current) + '" target="_blank" rel="noreferrer">' + escapeHtml(current) + '</a></div>'
          : '<div class="muted slide-image-file">No image selected.</div>') +
      '</div>';
  }

  function renderTemplate() {
    clearImagePreviewUrls();
    destroyEditors();
    var template = getTemplateById(templateSelect.value);
    if (!template) {
      templateFields.innerHTML = '';
      renderPreview();
      return;
    }

    templateFields.innerHTML = template.regions.length ? template.regions.map(function (region) {
      if (region.region_type === 'image') {
        return renderImageRegion(region);
      }
      if (region.region_type === 'webpage') {
        return renderWebpageRegion(region);
      }
      if (region.region_type === 'html') {
        return renderHtmlRegion(region);
      }
      return renderTextRegion(region);
    }).join('') : '<div class="muted">This template has no regions.</div>';

    templateFields.querySelectorAll('.editorjs-holder').forEach(function (holder) {
      var regionId = holder.getAttribute('data-region-id');
      var hidden = getEditorHiddenInput(regionId);
      var editor = new EditorJS({
        holder: holder.id,
        minHeight: 120,
        placeholder: 'Write content...',
        inlineToolbar: true,
        tools: {
          header: {
            class: Header,
            config: {
              placeholder: 'Enter a header',
              levels: [1, 2, 3, 4],
              defaultLevel: 3
            }
          },
          list: {
            class: EditorjsList,
            inlineToolbar: false,
            config: {
              defaultStyle: 'unordered'
            }
          },
          table: {
            class: Table,
            inlineToolbar: true,
            config: {
              rows: 2,
              cols: 3,
              maxRows: 5,
              maxCols: 5
            }
          },
          marker: {
            class: Marker
          }
        },
        data: normalizeEditorData(hidden ? hidden.value : ''),
        onChange: function () {
          var instance = editorInstances.get(regionId);
          if (!instance) {
            return;
          }
          instance.save().then(function (output) {
            if (hidden) {
              hidden.value = JSON.stringify(output);
            }
            renderPreview();
          });
        }
      });
      editorInstances.set(regionId, editor);
    });

    templateFields.querySelectorAll('input[type="file"][name^="region_image_"]').forEach(function (input) {
      input.addEventListener('change', function () {
        if (input.dataset.previewUrl) {
          URL.revokeObjectURL(input.dataset.previewUrl);
          delete input.dataset.previewUrl;
        }
        if (input.files && input.files.length) {
          input.dataset.previewUrl = URL.createObjectURL(input.files[0]);
        }
        renderPreview();
      });
    });
    renderPreview();
  }

  slideForm.addEventListener('submit', async function (event) {
    if (submitting) {
      return;
    }
    event.preventDefault();
    var saves = Array.prototype.map.call(templateFields.querySelectorAll('.editorjs-holder'), function (holder) {
      var regionId = holder.getAttribute('data-region-id');
      var editor = editorInstances.get(regionId);
      var hidden = getEditorHiddenInput(regionId);
      if (!editor || !hidden) {
        return Promise.resolve();
      }
      return editor.save().then(function (output) {
        hidden.value = JSON.stringify(output);
      });
    });
    submitting = true;
    try {
      await Promise.all(saves);
      var response = await fetch(slideForm.action, {
        method: (slideForm.method || 'POST').toUpperCase(),
        headers: {
          'X-Requested-With': 'XMLHttpRequest',
          'Accept': 'text/html, application/json, text/plain, */*'
        },
        body: new FormData(slideForm),
        credentials: 'same-origin'
      });

      if (!response.ok) {
        throw new Error(await response.text() || 'Unable to save slide.');
      }

      var responseText = await response.text();
      var savedMessage = '';
      try {
        var doc = new DOMParser().parseFromString(responseText || '', 'text/html');
        var toastBody = doc.querySelector('.toast-body');
        if (toastBody && toastBody.textContent) {
          savedMessage = toastBody.textContent.trim();
        }
      } catch (_error) {
        savedMessage = '';
      }

      showToast(savedMessage || 'Saved slide.');
      window.location.href = response.url || slideForm.action;
    } finally {
      submitting = false;
    }
  });

  templateSelect.addEventListener('change', renderTemplate);
  templateFields.addEventListener('change', renderPreview);
  templateFields.addEventListener('input', renderPreview);
  if (existingTemplateId) {
    templateSelect.value = String(existingTemplateId);
  }
  renderTemplate();
  window.addEventListener('resize', renderPreview);
})();