export const MANUAL_EDIT_DISCOVERY_SELECTOR = 'main, nav, section, article, header, footer, div, h1, h2, h3, p, a, button, img, strong, span';
export const MANUAL_EDIT_SOURCE_PATH_ATTR = 'data-od-source-path';
export const MANUAL_EDIT_HOST_NODE_SELECTOR = [
  '[data-od-sandbox-shim]',
  '[data-od-deck-bridge]',
  '[data-od-comment-bridge]',
  '[data-od-edit-bridge]',
  '[data-od-comment-bridge-style]',
  '[data-od-edit-bridge-style]',
  '[data-od-deck-fix]',
].join(',');

export function manualEditDomPathForElement(el: Element): string {
  const parts: number[] = [];
  let node: Element | null = el;
  while (node && node !== node.ownerDocument.body) {
    const parentEl: Element | null = node.parentElement;
    if (!parentEl) break;
    const children = Array.from(parentEl.children).filter((child) => !isManualEditHostNode(child));
    parts.unshift(children.indexOf(node));
    node = parentEl;
  }
  return parts.length ? `path-${parts.join('-')}` : '';
}

export function isManualEditHostNode(el: Element): boolean {
  return el.matches(MANUAL_EDIT_HOST_NODE_SELECTOR);
}

export function manualEditStableIdForElement(el: Element): string {
  const explicit = el.getAttribute('data-od-id');
  if (explicit) return explicit;
  const generated = el.getAttribute(MANUAL_EDIT_SOURCE_PATH_ATTR) || el.getAttribute('data-od-runtime-id') || manualEditDomPathForElement(el);
  if (generated) el.setAttribute('data-od-runtime-id', generated);
  return generated || 'unknown';
}

export function isMeaningfulManualEditElement(el: Element, rect: Pick<DOMRect, 'width' | 'height'>): boolean {
  return isSourceMappableManualEditElement(el) && el.matches(MANUAL_EDIT_DISCOVERY_SELECTOR) && rect.width >= 4 && rect.height >= 4;
}

export function isSourceMappableManualEditElement(el: Element): boolean {
  return el.hasAttribute('data-od-id') || el.hasAttribute(MANUAL_EDIT_SOURCE_PATH_ATTR);
}

export function buildManualEditBridge(enabled: boolean): string {
  return `<script data-od-edit-bridge>(function(){
  var enabled = ${JSON.stringify(enabled)};
  var discoverySelector = ${JSON.stringify(MANUAL_EDIT_DISCOVERY_SELECTOR)};
  var hostNodeSelector = ${JSON.stringify(MANUAL_EDIT_HOST_NODE_SELECTOR)};
  var sourcePathAttr = ${JSON.stringify(MANUAL_EDIT_SOURCE_PATH_ATTR)};
  var styleProps = ['color','backgroundColor','fontSize','fontWeight','textAlign','padding','margin','borderRadius','border','width','minHeight'];
  function isHostNode(el){
    return !!(el && el.matches && el.matches(hostNodeSelector));
  }
  function domPath(el){
    var parts = [];
    var node = el;
    while (node && node !== document.body) {
      var parent = node.parentElement;
      if (!parent) break;
      var children = Array.prototype.slice.call(parent.children).filter(function(child){ return !isHostNode(child); });
      parts.unshift(children.indexOf(node));
      node = parent;
    }
    return parts.length ? 'path-' + parts.join('-') : '';
  }
  function stableId(el){
    var explicit = el.getAttribute('data-od-id');
    if (explicit) return explicit;
    var generated = el.getAttribute(sourcePathAttr) || el.getAttribute('data-od-runtime-id') || domPath(el);
    if (generated) el.setAttribute('data-od-runtime-id', generated);
    return generated || 'unknown';
  }
  function isSourceMappable(el){
    return !!(el && el.hasAttribute && (el.hasAttribute('data-od-id') || el.hasAttribute(sourcePathAttr)));
  }
  function isDiscoveryTarget(el){
    return !!(el && el.matches && el.matches(discoverySelector));
  }
  function isPrimaryTarget(el){
    if (!el || !el.hasAttribute) return false;
    if (el.hasAttribute('data-od-id') || el.hasAttribute('data-od-edit')) return true;
    var tag = el.tagName ? el.tagName.toLowerCase() : '';
    return tag === 'a' || tag === 'button';
  }
  function inferKind(el){
    var explicit = el.getAttribute('data-od-edit');
    if (explicit) return explicit;
    var tag = el.tagName ? el.tagName.toLowerCase() : '';
    if (tag === 'a') return 'link';
    if (tag === 'img') return 'image';
    if (['section','main','nav','div','article','header','footer'].indexOf(tag) >= 0) return 'container';
    return 'text';
  }
  function labelFor(el, id, kind){
    var explicit = el.getAttribute('data-od-label');
    if (explicit) return explicit;
    var tag = el.tagName ? el.tagName.toLowerCase() : 'element';
    var text = (el.textContent || '').replace(/\\s+/g, ' ').trim();
    if (text) return text.slice(0, 42);
    if (kind === 'image') return el.getAttribute('alt') || id;
    return tag + ' #' + id;
  }
  function attrsFor(el){
    var attrs = {};
    for (var i = 0; i < el.attributes.length; i++) {
      var attr = el.attributes[i];
      if (!attr || attr.name.indexOf('data-od-runtime') === 0) continue;
      attrs[attr.name] = attr.value;
    }
    return attrs;
  }
  function stylesFor(el){
    var computed = window.getComputedStyle(el);
    var styles = {};
    styleProps.forEach(function(prop){ styles[prop] = el.style[prop] || computed[prop] || ''; });
    return styles;
  }
  function targetFrom(el, includeOuterHtml){
    var rect = el.getBoundingClientRect();
    var kind = inferKind(el);
    var id = stableId(el);
    var fields = {};
    if (kind === 'link') {
      fields.text = (el.textContent || '').trim();
      fields.href = el.getAttribute('href') || '';
    } else if (kind === 'image') {
      fields.src = el.getAttribute('src') || '';
      fields.alt = el.getAttribute('alt') || '';
    } else {
      fields.text = (el.textContent || '').trim();
    }
    return {
      id: id,
      kind: kind,
      label: labelFor(el, id, kind),
      tagName: el.tagName ? el.tagName.toLowerCase() : 'element',
      className: typeof el.className === 'string' ? el.className : '',
      text: (el.textContent || '').replace(/\\s+/g, ' ').trim().slice(0, 180),
      rect: { x: Math.round(rect.x), y: Math.round(rect.y), width: Math.round(rect.width), height: Math.round(rect.height) },
      fields: fields,
      attributes: attrsFor(el),
      styles: stylesFor(el),
      outerHtml: includeOuterHtml ? (el.outerHTML || '').replace(/\\sdata-od-runtime-id="[^"]*"/g, '').replace(/\\sdata-od-source-path="[^"]*"/g, '') : ''
    };
  }
  function allTargets(){
    var nodes = document.body ? document.body.querySelectorAll(discoverySelector) : [];
    var targets = [];
    for (var i = 0; i < nodes.length; i++) {
      var rect = nodes[i].getBoundingClientRect();
      if (rect.width < 4 || rect.height < 4) continue;
      if (!isSourceMappable(nodes[i])) continue;
      targets.push(targetFrom(nodes[i], false));
    }
    return targets;
  }
  function postTargets(){
    if (!enabled) return;
    window.parent.postMessage({ type: 'od-edit-targets', targets: allTargets() }, '*');
  }
  function closestTarget(event){
    var el = event.target;
    var fallback = null;
    while (el && el !== document.documentElement) {
      if (el !== document.body && el !== document.documentElement && isSourceMappable(el) && isDiscoveryTarget(el)) {
        if (isPrimaryTarget(el)) return el;
        if (!fallback) fallback = el;
      }
      el = el.parentElement;
    }
    return fallback;
  }
  window.addEventListener('message', function(ev){
    if (!ev.data || ev.data.type !== 'od-edit-mode') return;
    enabled = !!ev.data.enabled;
    document.documentElement.toggleAttribute('data-od-edit-mode', enabled);
    if (enabled) setTimeout(postTargets, 0);
  });
  document.addEventListener('click', function(ev){
    if (!enabled) return;
    var el = closestTarget(ev);
    if (!el) return;
    ev.preventDefault();
    ev.stopPropagation();
    window.parent.postMessage({ type: 'od-edit-select', target: targetFrom(el, true) }, '*');
  }, true);
  window.addEventListener('resize', postTargets);
  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', postTargets);
  else setTimeout(postTargets, 0);
  document.documentElement.toggleAttribute('data-od-edit-mode', enabled);
})();</script>`;
}

export function buildManualEditBridgeStyle(): string {
  return `<style data-od-edit-bridge-style>
html[data-od-edit-mode] body * { cursor: pointer !important; }
html[data-od-edit-mode] [data-od-id],
html[data-od-edit-mode] [data-od-runtime-id] { outline: 1px dashed rgba(37, 99, 235, 0.35); outline-offset: 3px; }
html[data-od-edit-mode] [data-od-id]:hover,
html[data-od-edit-mode] [data-od-runtime-id]:hover { outline: 2px solid #2563eb; }
</style>`;
}