/* Lagos MiND — Google Analytics 4
 * Measurement ID: G-P72B2XZ467
 * Privacy: no names, phone numbers, emails, clinical information, or raw
 * Knowledge Centre search terms are sent to Google Analytics.
 */
(function () {
  'use strict';

  var MEASUREMENT_ID = 'G-P72B2XZ467';
  var GA_SRC = 'https://www.googletagmanager.com/gtag/js?id=' + MEASUREMENT_ID;

  window.dataLayer = window.dataLayer || [];
  window.gtag = window.gtag || function(){ window.dataLayer.push(arguments); };
  window.gtag('js', new Date());
  window.gtag('config', MEASUREMENT_ID, {
    anonymize_ip: true,
    send_page_view: true
  });

  if (!document.querySelector('script[data-lagosmind-ga4]')) {
    var s = document.createElement('script');
    s.async = true;
    s.src = GA_SRC;
    s.setAttribute('data-lagosmind-ga4', 'true');
    document.head.appendChild(s);
  }

  function path() {
    return window.location.pathname || '/';
  }

  function cleanLabel(value) {
    return (value || '').toString().trim().slice(0, 100);
  }

  function pageType() {
    var p = path().toLowerCase();
    if (/^\/post-/.test(p)) return 'blog_post';
    if (/^\/article-/.test(p)) return 'article';
    if (p === '/blog' || p === 'blog-2.html') return 'blog_listing';
    if (p === '/articles' || p === 'articles-2.html') return 'article_listing';
    if (p.indexOf('blog-search') !== -1) return 'blog_search';
    if (p.indexOf('articles-search') !== -1) return 'article_search';
    if (p.indexOf('/providers') === 0) return 'providers';
    return 'page';
  }

  function event(name, params) {
    if (typeof window.gtag !== 'function') return;
    window.gtag('event', name, params || {});
  }

  // Useful, non-sensitive page/content reporting.
  document.addEventListener('DOMContentLoaded', function () {
    event('page_type_view', {
      page_type: pageType()
    });
  });

  document.addEventListener('click', function (e) {
    var el = e.target && e.target.closest ? e.target.closest('a,button,[role="button"]') : null;
    if (!el) return;

    var href = el.getAttribute('href') || '';
    var text = cleanLabel(el.textContent);
    var lowerHref = href.toLowerCase();

    // WhatsApp
    if (lowerHref.indexOf('wa.me/') !== -1 ||
        lowerHref.indexOf('api.whatsapp.com/') !== -1 ||
        lowerHref.indexOf('whatsapp.com/') !== -1) {
      event('whatsapp_click', {
        link_text: text || 'WhatsApp',
        page_type: pageType()
      });
      return;
    }

    // Phone calls — only the fact of the click is recorded.
    if (lowerHref.indexOf('tel:') === 0) {
      event('phone_click', {
        link_text: text || 'Phone',
        page_type: pageType()
      });
      return;
    }

    // Email — do not send the email address.
    if (lowerHref.indexOf('mailto:') === 0) {
      event('email_click', {
        link_text: text || 'Email',
        page_type: pageType()
      });
      return;
    }

    // Get Help / crisis-support CTAs.
    var helpText = text.toLowerCase();
    if (helpText.indexOf('get help') !== -1 ||
        helpText.indexOf('get support') !== -1 ||
        helpText.indexOf('talk to someone') !== -1 ||
        helpText.indexOf('need help') !== -1) {
      event('get_help_click', {
        link_text: text || 'Get Help',
        page_type: pageType()
      });
    }

    // Knowledge Centre content interaction.
    if (/^\/post-/.test(href.toLowerCase())) {
      event('blog_post_click', { page_type: pageType() });
    } else if (/^\/article-/.test(href.toLowerCase())) {
      event('article_click', { page_type: pageType() });
    }

    // Provider profile links. No names or clinical details are sent.
    if (href.toLowerCase().indexOf('provider.html') !== -1 ||
        href.toLowerCase().indexOf('providers/https://lagosminded.org/') !== -1) {
      event('provider_profile_click', { page_type: pageType() });
    }

    // File downloads.
    if (/\.(pdf|docx?|xlsx?|pptx?|csv|zip)(?:[?#]|$)/i.test(lowerHref)) {
      event('file_download_click', {
        file_type: (lowerHref.match(/\.([a-z0-9]+)(?:[?#]|$)/i) || [,'unknown'])[1]
      });
    }

    // External links: record only the host category, not the full URL/query.
    if (/^https?:\/\//i.test(href)) {
      try {
        var u = new URL(href, window.location.href);
        if (u.hostname !== window.location.hostname) {
          event('external_link_click', {
            outbound_host: u.hostname
          });
        }
      } catch (_) {}
    }
  }, true);

  // Search interaction: intentionally omit the search term.
  document.addEventListener('submit', function (e) {
    var form = e.target;
    if (!form || !form.querySelector) return;
    var action = (form.getAttribute('action') || '').toLowerCase();
    var input = form.querySelector('input[type="search"], input[name="q"], input[name="search"]');
    if (!input) return;

    if (action.indexOf('blog-search') !== -1 ||
        action.indexOf('articles-search') !== -1 ||
        path().toLowerCase().indexOf('blog-search') !== -1 ||
        path().toLowerCase().indexOf('articles-search') !== -1) {
      event('knowledge_search', {
        search_type: path().toLowerCase().indexOf('articles') !== -1 ? 'articles' : 'blog'
      });
    }
  }, true);
})();