/**
 * Umami Analytics - Privacy-First Tracking
 * No cookies, no personal data, GDPR-compliant
 *
 * Features:
 * - Respects Do Not Track (DNT) browser setting
 * - Honors user opt-out preference
 * - Disabled in development environment
 * - Lightweight async loading
 */

(function() {
  'use strict';

  // Configuration
  const CONFIG = {
    // NOTE: Replace this with actual website ID from Umami dashboard after setup
    websiteId: 'REPLACE_WITH_ACTUAL_WEBSITE_ID',
    domain: 'agenticgovernance.digital',
    scriptSrc: 'https://analytics.agenticgovernance.digital/script.js',
    autoTrack: true
  };

  // Development environment check
  const isDevelopment =
    window.location.hostname === 'localhost' ||
    window.location.hostname === '127.0.0.1' ||
    window.location.hostname === '' ||
    window.location.port === '9000'; // Local dev server

  if (isDevelopment) {
    console.log('[Umami Analytics] Disabled in development environment');
    return;
  }

  // Respect Do Not Track (DNT) browser setting
  const dnt = navigator.doNotTrack || window.doNotTrack || navigator.msDoNotTrack;
  const dntEnabled = dnt === '1' || dnt === 'yes' || dnt === 'on';

  if (dntEnabled) {
    console.log('[Umami Analytics] Tracking disabled - Do Not Track enabled');
    return;
  }

  // Check for user opt-out preference (localStorage)
  try {
    const optedOut = localStorage.getItem('umami.disabled') === 'true';
    if (optedOut) {
      console.log('[Umami Analytics] Tracking disabled - User opted out');
      return;
    }
  } catch (e) {
    // localStorage may not be available (privacy mode, etc.)
    console.warn('[Umami Analytics] Cannot check opt-out preference:', e);
  }

  // Website ID validation
  if (CONFIG.websiteId === 'REPLACE_WITH_ACTUAL_WEBSITE_ID') {
    console.warn('[Umami Analytics] Website ID not configured. Update umami-tracker.js after Umami setup.');
    return;
  }

  // Load Umami tracking script
  const script = document.createElement('script');
  script.async = true;
  script.defer = true;
  script.src = CONFIG.scriptSrc;
  script.setAttribute('data-website-id', CONFIG.websiteId);
  script.setAttribute('data-domains', CONFIG.domain);
  script.setAttribute('data-auto-track', CONFIG.autoTrack.toString());

  // Error handling
  script.onerror = function() {
    console.error('[Umami Analytics] Failed to load tracking script from:', CONFIG.scriptSrc);
  };

  // Success callback
  script.onload = function() {
    console.log('[Umami Analytics] Tracking initialized (privacy-first, cookie-free)');
  };

  // Append script to head
  document.head.appendChild(script);

  // Expose opt-out function for privacy page
  window.umamiOptOut = function() {
    try {
      localStorage.setItem('umami.disabled', 'true');
      console.log('[Umami Analytics] User opted out successfully');
      alert('Analytics tracking has been disabled. Reload the page to apply changes.');
      return true;
    } catch (e) {
      console.error('[Umami Analytics] Failed to save opt-out preference:', e);
      alert('Failed to save opt-out preference. Please ensure cookies/localStorage is enabled.');
      return false;
    }
  };

  // Expose opt-in function (to reverse opt-out)
  window.umamiOptIn = function() {
    try {
      localStorage.removeItem('umami.disabled');
      console.log('[Umami Analytics] User opted in successfully');
      alert('Analytics tracking has been enabled. Reload the page to apply changes.');
      return true;
    } catch (e) {
      console.error('[Umami Analytics] Failed to save opt-in preference:', e);
      return false;
    }
  };

  // Expose status check function
  window.umamiStatus = function() {
    const status = {
      enabled: true,
      development: isDevelopment,
      dnt: dntEnabled,
      optedOut: false,
      websiteId: CONFIG.websiteId
    };

    try {
      status.optedOut = localStorage.getItem('umami.disabled') === 'true';
    } catch (e) {
      status.optedOut = null;
    }

    console.table(status);
    return status;
  };

})();