'use strict';

const defu = require('defu');
const hastUtilSelect = require('hast-util-select');
const hastUtilToText = require('hast-util-to-text');
const RehypeParse = require('rehype-parse');
const RetextStringify = require('retext-stringify');
const unified = require('unified');
const unistUtilRemove = require('unist-util-remove');
const unistUtilRemovePosition = require('unist-util-remove-position');

function _interopDefaultCompat (e) { return e && typeof e === 'object' && 'default' in e ? e.default : e; }

const RehypeParse__default = /*#__PURE__*/_interopDefaultCompat(RehypeParse);
const RetextStringify__default = /*#__PURE__*/_interopDefaultCompat(RetextStringify);

function RehypeRetext(option) {
  return (nodes) => {
    const vpDocElement = hastUtilSelect.select(option.selector, nodes);
    if (!vpDocElement)
      return;
    if (vpDocElement.children.length === 0)
      return;
    for (const selector of option.removeSelectors) {
      const elements = hastUtilSelect.selectAll(selector, vpDocElement);
      if (elements)
        unistUtilRemove.remove(vpDocElement, elements);
    }
    unistUtilRemovePosition.removePosition(vpDocElement);
    if (nodes.type !== "root" && nodes.type !== "element")
      return;
    const text = hastUtilToText.toText(vpDocElement).replaceAll(/(\n){2,}/g, " ");
    nodes.children = [{ type: "text", value: text }];
  };
}
function getMeta(head, fromKey, withValue) {
  return head.find(([key, attrs]) => key === "meta" && attrs[fromKey] === withValue);
}
function updateMetaOrCreateMeta(head, fromKey, withValue, asContent) {
  const meta = head.find(([key, attrs]) => key === "meta" && attrs[fromKey] === withValue);
  if (meta) {
    meta[1].content = asContent;
    return head;
  }
  head.push(["meta", { [fromKey]: withValue, content: asContent }]);
  return head;
}
function transformHeadMeta(options) {
  const opts = defu.defu(options, {
    length: 200,
    contentSelector: "#VPContent div.content main .vp-doc div",
    removeContentSelector: [
      "h1",
      "h2",
      "h3",
      "h4",
      "h5",
      "h6",
      ".vp-nolebase-page-properties-container",
      ".vp-nolebase-git-changelog-history-container",
      ".vp-nolebase-git-changelog-contributors-container"
    ],
    useTaglineForHomeLayout: true
  });
  return async (head, context) => {
    const result = (await unified.unified().data({ settings: { fragment: true } }).use(RehypeParse__default).use(RehypeRetext, {
      selector: opts.contentSelector,
      removeSelectors: opts.removeContentSelector
    }).use(RetextStringify__default).process(context.content)).toString();
    let excerpt = result.slice(0, opts.length).trim();
    if (result.length > opts.length)
      excerpt += "...";
    if (context.pageData.frontmatter?.layout === "home" && opts.useTaglineForHomeLayout)
      excerpt = context.pageData.frontmatter?.hero?.tagline ?? context.siteConfig.site.description;
    if (opts.handleExcerpt && typeof opts.handleExcerpt === "function") {
      const handledResult = opts.handleExcerpt(excerpt, context);
      if (handledResult && typeof handledResult === "string")
        excerpt = handledResult;
      else if (handledResult instanceof Promise)
        excerpt = await handledResult;
    }
    const ogTitle = getMeta(head, "property", "og:title");
    if (!ogTitle && context.pageData.title)
      head = updateMetaOrCreateMeta(head, "property", "og:title", context.pageData.title);
    head = updateMetaOrCreateMeta(head, "name", "description", excerpt);
    head = updateMetaOrCreateMeta(head, "property", "og:description", excerpt);
    head = updateMetaOrCreateMeta(head, "property", "twitter:description", excerpt);
    return head;
  };
}

exports.transformHeadMeta = transformHeadMeta;
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