/**
 * @typedef {import('@docusaurus/types').LoadContext} Ctx
 *
 * @typedef {import('@docusaurus/types').Plugin} Plugin
 *
 * @typedef {Object} PluginOptions
 * @property {string} apiKey - Segment write API key
 */

/** @type (context: Ctx, options: PluginOptions) => Plugin */
export default function analyticsLoader(_, options) {
  if (process.env.NODE_ENV !== 'production') {
    return null;
  }

  if (!options.apiKey || options.apiKey === '') {
    throw new Error('`analytics` plugin requires an `apiKey`');
  }

  return {
    name: 'analytics-plugin',
    contentLoaded({ actions }) {
      actions.setGlobalData(options);
    },
    getClientModules() {
      return ['./client-modules/track'];
    },
    injectHtmlTags() {
      return {
        headTags: [
          {
            tagName: 'script',
            attributes: {
              src: 'https://cdn.cookielaw.org/scripttemplates/otSDKStub.js',
              type: 'text/javascript',
              charset: 'UTF-8',
              'data-domain-script': '5e9f5149-bde8-4a13-b973-b7a9385e8ebb',
            },
          },
          {
            tagName: 'script',
            attributes: {
              type: 'text/javascript',
            },
            innerHTML: 'function OptanonWrapper() { }',
          },
          {
            tagName: 'script',
            attributes: {
              type: 'text/javascript',
            },
            innerHTML: `!function(){var analytics=window.analytics=window.analytics||[];if(!analytics.initialize)if(analytics.invoked)window.console&&console.error&&console.error("Segment snippet included twice.");else{analytics.invoked=!0;analytics.methods=["trackSubmit","trackClick","trackLink","trackForm","pageview","identify","reset","group","track","ready","alias","debug","page","once","off","on","addSourceMiddleware","addIntegrationMiddleware","setAnonymousId","addDestinationMiddleware"];analytics.factory=function(e){return function(){var t=Array.prototype.slice.call(arguments);t.unshift(e);analytics.push(t);return analytics}};for(var e=0;e<analytics.methods.length;e++){var key=analytics.methods[e];analytics[key]=analytics.factory(key)}analytics.load=function(key,e){var t=document.createElement("script");t.type="text/javascript";t.async=!0;t.src="https://cdn.segment.com/analytics.js/v1/" + key + "/analytics.min.js";var n=document.getElementsByTagName("script")[0];n.parentNode.insertBefore(t,n);analytics._loadOptions=e};analytics._writeKey="${options.apiKey}";;analytics.SNIPPET_VERSION="4.15.3";
analytics.load("${options.apiKey}");
analytics.page();
  }}();`,
          },
        ],
      };
    },
  };
}