(function () {
  'use strict';

  var config = window.BREW_ANALYTICS_CONFIG || {};
  var storageKey = config.consentStorageKey || 'brew_analytics_consent';
  var enabled = config.enabled !== false && config.enabled !== 'false';
  var metrikaId = String(config.yandexMetrikaId || '').trim();
  var appName = String(config.appName || 'site');
  var loaded = false;

  function readConsent() {
    try {
      return window.localStorage.getItem(storageKey);
    } catch (_) {
      return null;
    }
  }

  function writeConsent(value) {
    try {
      window.localStorage.setItem(storageKey, value);
    } catch (_) {}
  }

  function loadMetrika() {
    if (!enabled || !metrikaId || loaded || readConsent() !== 'granted') {
      return;
    }
    loaded = true;
    window.ym = window.ym || function () {
      (window.ym.a = window.ym.a || []).push(arguments);
    };
    window.ym.l = Date.now();
    window.ym(Number(metrikaId), 'init', {
      clickmap: true,
      trackLinks: true,
      accurateTrackBounce: true,
      webvisor: false,
    });
    var script = document.createElement('script');
    script.async = true;
    script.src = 'https://mc.yandex.ru/metrika/tag.js';
    document.head.appendChild(script);
  }

  function reachGoal(goal, params) {
    if (!enabled || !metrikaId || readConsent() !== 'granted') {
      return;
    }
    loadMetrika();
    if (typeof window.ym === 'function') {
      window.ym(Number(metrikaId), 'reachGoal', goal, Object.assign({
        app: appName,
      }, params || {}));
    }
  }

  function hit(url, title) {
    if (!enabled || !metrikaId || readConsent() !== 'granted') {
      return;
    }
    loadMetrika();
    if (typeof window.ym === 'function') {
      window.ym(Number(metrikaId), 'hit', url || window.location.href, {
        title: title || document.title,
        params: { app: appName },
      });
    }
  }

  function consentBanner() {
    if (!enabled || !metrikaId || readConsent()) {
      return;
    }
    var banner = document.createElement('div');
    banner.id = 'brew-cookie-consent';
    banner.style.cssText = [
      'position:fixed',
      'left:16px',
      'right:16px',
      'bottom:16px',
      'z-index:2147483647',
      'max-width:760px',
      'margin:auto',
      'padding:16px',
      'border-radius:16px',
      'background:#0f172a',
      'color:#e2e8f0',
      'box-shadow:0 16px 48px rgba(15,23,42,.28)',
      'font:14px/1.45 system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif',
    ].join(';');
    banner.innerHTML = [
      '<div style="font-weight:700;color:#fff;margin-bottom:6px">Аналитика и cookies</div>',
      '<div>Мы используем Яндекс.Метрику, чтобы понимать, какие разделы BrewMasters.team помогают пользователям. Аналитика включится только после согласия.</div>',
      '<div style="display:flex;gap:10px;flex-wrap:wrap;margin-top:12px">',
      '<button type="button" data-brew-consent="granted" style="border:0;border-radius:10px;background:#d97706;color:#fff;padding:10px 14px;font-weight:700;cursor:pointer">Разрешить аналитику</button>',
      '<button type="button" data-brew-consent="denied" style="border:1px solid #475569;border-radius:10px;background:transparent;color:#e2e8f0;padding:10px 14px;font-weight:700;cursor:pointer">Отклонить</button>',
      '<a href="/privacy" style="color:#fbbf24;align-self:center">Политика и cookies</a>',
      '</div>',
    ].join('');
    banner.addEventListener('click', function (event) {
      var target = event.target;
      if (!target || !target.getAttribute) return;
      var value = target.getAttribute('data-brew-consent');
      if (!value) return;
      writeConsent(value);
      banner.remove();
      if (value === 'granted') {
        loadMetrika();
        hit(window.location.href, document.title);
      }
    });
    document.body.appendChild(banner);
  }

  function captureUtm() {
    try {
      var params = new URLSearchParams(window.location.search);
      var payload = {};
      ['utm_source', 'utm_medium', 'utm_campaign', 'utm_content', 'utm_term'].forEach(function (key) {
        var value = params.get(key);
        if (value) payload[key] = value.substring(0, 160);
      });
      if (Object.keys(payload).length > 0) {
        payload.landing_url = window.location.href.substring(0, 500);
        payload.captured_at = new Date().toISOString();
        window.localStorage.setItem('brew_attribution', JSON.stringify(payload));
      }
    } catch (_) {}
  }

  document.addEventListener('click', function (event) {
    var node = event.target;
    while (node && node !== document) {
      if (node.getAttribute && node.getAttribute('data-analytics-goal')) {
        reachGoal(node.getAttribute('data-analytics-goal'), {
          href: node.href || undefined,
          text: (node.textContent || '').trim().substring(0, 80),
        });
        return;
      }
      node = node.parentNode;
    }
  });

  window.BrewAnalytics = {
    consent: readConsent,
    grantConsent: function () {
      writeConsent('granted');
      loadMetrika();
    },
    denyConsent: function () {
      writeConsent('denied');
    },
    hit: hit,
    reachGoal: reachGoal,
    setUser: function (userId) {
      if (typeof window.ym === 'function' && metrikaId && userId) {
        window.ym(Number(metrikaId), 'userParams', { UserID: String(userId) });
      }
    },
    clearUser: function () {},
    attribution: function () {
      try {
        return window.localStorage.getItem('brew_attribution') || '';
      } catch (_) {
        return '';
      }
    },
  };

  captureUtm();
  if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', function () {
      consentBanner();
      loadMetrika();
    });
  } else {
    consentBanner();
    loadMetrika();
  }
})();