// Outlook Relook — MutationObserver
// Watches OWA's DOM and removes dynamically injected elements
// based on active settings.

window.OutlookRelook = window.OutlookRelook || {};

window.OutlookRelook.Observer = (function () {
  'use strict';

  let observer = null;
  let currentSettings = {};

  // Map setting keys to selector registry names
  // Each setting can suppress one or more logical elements
  const SETTING_TO_SELECTORS = {
    hideCopilot: ['copilot-button', 'copilot-pane', 'copilot-compose-suggestions'],
    hideSuggestedReplies: ['suggested-replies'],
    hidePromoBanners: ['promo-banners'],
    hideFocusedOtherTabs: ['focused-other-tabs'],
    hideSidebarAppIcons: ['sidebar-app-icons'],
    hideGroupsSection: ['groups-section'],
    hideMyDayButtons: ['my-day-buttons'],
    hideSenderAvatars: ['sender-avatars'],
    hideFeatureDiscovery: ['feature-discovery'],
    hideVivaInsights: ['viva-insights'],
    hideUnreadOtherBanner: ['unread-other-banner'],
    hideActivityFeed: ['activity-feed'],
  };

  // Text content patterns to match elements by their inner text.
  // Used when aria/data selectors don't catch dynamically injected content.
  const TEXT_PATTERNS = {
    hidePromoBanners: [
      /try the new outlook/i,
      /upgrade to premium/i,
      /get the outlook app/i,
      /switch to the new/i,
    ],
    hideFeatureDiscovery: [
      /what's new/i,
      /new feature/i,
      /did you know/i,
    ],
  };

  function suppressElements() {
    for (const [settingKey, selectorNames] of Object.entries(SETTING_TO_SELECTORS)) {
      if (!currentSettings[settingKey]) continue;

      for (const name of selectorNames) {
        const elements = window.OutlookRelook.resolveSelector(name);
        for (const el of elements) {
          if (el.style.display !== 'none') {
            el.style.display = 'none';
            console.log('[Outcut] Suppressed: ' + name, el);
          }
        }
      }
    }

    // Text-based suppression for elements missed by selectors
    for (const [settingKey, patterns] of Object.entries(TEXT_PATTERNS)) {
      if (!currentSettings[settingKey]) continue;

      for (const pattern of patterns) {
        // Check buttons, banners, and generic containers
        const candidates = document.querySelectorAll(
          '[role="alert"], [role="banner"], [role="dialog"], [role="status"], button, a'
        );
        for (const el of candidates) {
          if (el.style.display === 'none') continue;
          var text = el.textContent || '';
          if (pattern.test(text) && text.length < 200) {
            el.style.display = 'none';
            console.log('[Outcut] Suppressed by text: "' + text.trim().substring(0, 50) + '"', el);
          }
        }
      }
    }
  }

  function start(settings) {
    currentSettings = settings;

    // Initial pass
    suppressElements();

    // Watch for DOM mutations
    observer = new MutationObserver(function (mutations) {
      // Debounce: only process if nodes were actually added
      var hasAddedNodes = false;
      for (var i = 0; i < mutations.length; i++) {
        if (mutations[i].addedNodes.length > 0) {
          hasAddedNodes = true;
          break;
        }
      }
      if (hasAddedNodes) {
        suppressElements();
      }
    });

    observer.observe(document.body, {
      childList: true,
      subtree: true,
    });

    console.log('[Outcut] Observer started');
  }

  function updateSettings(settings) {
    currentSettings = settings;
    // Re-run suppression with new settings
    suppressElements();
  }

  function stop() {
    if (observer) {
      observer.disconnect();
      observer = null;
      console.log('[Outcut] Observer stopped');
    }
  }

  return { start: start, updateSettings: updateSettings, stop: stop };
})();