gc-alexandria/src/routes/visualize/+page.svelte

<!--
  Visualization Page
  
  This page displays a network visualization of Nostr publications,
  showing the relationships between index events and their content.
-->
<script lang="ts">
  import { onMount } from "svelte";
  import { get } from "svelte/store";
  import EventNetwork from "$lib/navigator/EventNetwork/index.svelte";
  import { ndkInstance } from "$lib/ndk";
  import type { NDKEvent } from "@nostr-dev-kit/ndk";
  import { filterValidIndexEvents } from "$lib/utils";
  import { networkFetchLimit } from "$lib/state";
  import { visualizationConfig, type EventKindConfig } from "$lib/stores/visualizationConfig";
  import { filterByDisplayLimits, detectMissingEvents, buildCoordinateMap } from "$lib/utils/displayLimits";
  import type { PageData } from './$types';
  import { getEventKindColor, getEventKindName } from "$lib/utils/eventColors";
  import { extractPubkeysFromEvents, batchFetchProfiles } from "$lib/utils/profileCache";
  import { activePubkey } from "$lib/ndk";
  // Import utility functions for tag-based event fetching
  // These functions handle the complex logic of finding publications by tags
  // and extracting their associated content events
  import { 
    fetchTaggedEventsFromRelays, 
    findTaggedEventsInFetched,
    fetchProfilesForNewEvents
  } from "$lib/utils/tag_event_fetch";
  import { deduplicateAndCombineEvents } from "$lib/utils/eventDeduplication";
  import type { EventCounts } from "$lib/types";
  
  // Configuration
  const DEBUG = true; // Set to true to enable debug logging
  const INDEX_EVENT_KIND = 30040;
  const CONTENT_EVENT_KINDS = [30041, 30818];
  
  // Props from load function
  let { data } = $props<{ data: PageData }>();
  
  /**
   * Debug logging function that only logs when DEBUG is true
   */
  function debug(...args: any[]) {
    if (DEBUG) {
      console.log("[VisualizePage]", ...args);
    }
  }

  // State
  let allEvents = $state<NDKEvent[]>([]); // All fetched events
  let events = $derived.by(() => {
    if (allEvents.length > 0) {
      const filtered = filterByDisplayLimits(allEvents, $visualizationConfig);
      debug("Derived events update:", { allEvents: allEvents.length, filtered: filtered.length });
      return filtered;
    }
    return [];
  }); // Events to display (filtered by limits)
  let loading = $state(true);
  let error = $state<string | null>(null);
  let showSettings = $state(false);
  let baseEvents = $state<NDKEvent[]>([]); // Store original events before expansion
  let missingEventIds = $derived.by(() => {
    if (allEvents.length > 0) {
      const eventIds = new Set(allEvents.map(e => e.id));
      const coordinateMap = buildCoordinateMap(allEvents);
      const missing = detectMissingEvents(events, eventIds, coordinateMap);
      debug("Derived missingEventIds update:", { 
        allEvents: allEvents.length, 
        events: events.length, 
        missing: missing.size,
        coordinates: coordinateMap.size 
      });
      return missing;
    }
    return new Set<string>();
  }); // Track missing referenced events
  let loadingEventKinds = $state<Array<{kind: number, limit: number}>>([]);  // Track what kinds are being loaded
  let isFetching = false; // Guard against concurrent fetches
  let followListEvents = $state<NDKEvent[]>([]); // Store follow list events separately
  
  // Profile loading progress
  let profileLoadingProgress = $state<{current: number, total: number} | null>(null);
  let profileLoadingMessage = $derived(
    profileLoadingProgress 
      ? `Loading profiles: ${profileLoadingProgress.current}/${profileLoadingProgress.total}`
      : null
  );
  
  // Profile stats for EventTypeConfig
  let profileStats = $state<{totalFetched: number, displayLimit: number}>({
    totalFetched: 0,
    displayLimit: 50
  });
  
  // Event counts from all events (not just filtered)
  let allEventCounts = $derived.by(() => {
    const counts: EventCounts = {};
    allEvents.forEach((event: NDKEvent) => {
      if (event.kind !== undefined) {
        counts[event.kind] = (counts[event.kind] || 0) + 1;
      }
    });
    debug("All event counts:", counts);
    return counts;
  });

  /**
   * Fetches follow lists (kind 3) with depth expansion
   */
  async function fetchFollowLists(config: EventKindConfig): Promise<NDKEvent[]> {
    const depth = config.depth || 0;
    const allFollowEvents: NDKEvent[] = [];
    const processedPubkeys = new Set<string>();
    
    debug(`Fetching kind 3 follow lists with limit ${config.limit}, depth ${depth}`);
    
    // If limit is 0, don't fetch any follow lists
    if (config.limit === 0) {
      debug("Follow list limit is 0, skipping fetch");
      return [];
    }
    
    // Get the current user's pubkey
    const currentUserPubkey = get(activePubkey);
    if (!currentUserPubkey) {
      console.warn("No logged-in user, cannot fetch user's follow list");
      return [];
    }
    
    // If limit is 1, only fetch the current user's follow list
    if (config.limit === 1) {
      const userFollowList = await $ndkInstance.fetchEvents({
        kinds: [3],
        authors: [currentUserPubkey],
        limit: 1
      });
      
      if (userFollowList.size === 0) {
        console.warn("User has no follow list");
        return [];
      }
      
      const userFollowEvent = Array.from(userFollowList)[0];
      allFollowEvents.push(userFollowEvent);
      processedPubkeys.add(currentUserPubkey);
      
      debug(`Fetched user's follow list`);
    } else {
      // If limit > 1, fetch the user's follow list plus additional ones from people they follow
      const userFollowList = await $ndkInstance.fetchEvents({
        kinds: [3],
        authors: [currentUserPubkey],
        limit: 1
      });
      
      if (userFollowList.size === 0) {
        console.warn("User has no follow list");
        return [];
      }
      
      const userFollowEvent = Array.from(userFollowList)[0];
      allFollowEvents.push(userFollowEvent);
      processedPubkeys.add(currentUserPubkey);
      
      // Extract followed pubkeys
      const followedPubkeys: string[] = [];
      userFollowEvent.tags.forEach(tag => {
        if (tag[0] === 'p' && tag[1]) {
          followedPubkeys.push(tag[1]);
        }
      });
      
      debug(`User follows ${followedPubkeys.length} people`);
      
      // Fetch additional follow lists from people you follow
      if (followedPubkeys.length > 0) {
        const additionalLimit = config.limit - 1; // We already have the user's
        const pubkeysToFetch = followedPubkeys.slice(0, additionalLimit);
        
        debug(`Fetching ${pubkeysToFetch.length} additional follow lists (total limit: ${config.limit})`);
        
        const additionalFollowLists = await $ndkInstance.fetchEvents({
          kinds: [3],
          authors: pubkeysToFetch
        });
        
        allFollowEvents.push(...Array.from(additionalFollowLists));
        
        // Mark these as processed
        additionalFollowLists.forEach(event => {
          processedPubkeys.add(event.pubkey);
        });
        
        debug(`Fetched ${additionalFollowLists.size} additional follow lists`);
      }
    }
    
    // If depth > 0, we need to fetch follow lists of follows (recursively)
    if (depth > 0) {
      // Start with all pubkeys from fetched follow lists
      let currentLevelPubkeys: string[] = [];
      allFollowEvents.forEach(event => {
        event.tags.forEach(tag => {
          if (tag[0] === 'p' && tag[1] && !processedPubkeys.has(tag[1])) {
            currentLevelPubkeys.push(tag[1]);
          }
        });
      });
      
      // Fetch additional levels based on depth
      for (let level = 1; level <= depth; level++) {
        if (currentLevelPubkeys.length === 0) break;
        
        debug(`Fetching level ${level} follow lists for ${currentLevelPubkeys.length} pubkeys`);
        
        // Fetch follow lists for this level
        const levelFollowLists = await $ndkInstance.fetchEvents({
          kinds: [3],
          authors: currentLevelPubkeys
        });
        
        const nextLevelPubkeys: string[] = [];
        
        levelFollowLists.forEach(event => {
          allFollowEvents.push(event);
          processedPubkeys.add(event.pubkey);
          
          // Extract pubkeys for next level
          if (level < depth) {
            event.tags.forEach(tag => {
              if (tag[0] === 'p' && tag[1] && !processedPubkeys.has(tag[1])) {
                nextLevelPubkeys.push(tag[1]);
              }
            });
          }
        });
        
        currentLevelPubkeys = nextLevelPubkeys;
      }
    }
    
    debug(`Fetched ${allFollowEvents.length} follow lists total`);
    
    // Store follow lists separately for tag anchor use
    followListEvents = [...allFollowEvents];
    
    return allFollowEvents;
  }

  /**
   * Fetches events from the Nostr network
   * 
   * This function orchestrates the fetching of events through multiple steps:
   * 1. Setup configuration and loading state
   * 2. Fetch non-publication events (kinds 1, 3, etc.)
   * 3. Fetch publication index events
   * 4. Extract and fetch content events
   * 5. Deduplicate and combine all events
   * 6. Fetch profiles for discovered pubkeys
   * 7. Apply display limits and finalize
   */
  async function fetchEvents() {
    // Prevent concurrent fetches
    if (isFetching) {
      debug("Fetch already in progress, skipping");
      return;
    }
    
    debug("Fetching events with limit:", $networkFetchLimit);
    debug("Event ID from URL:", data.eventId);
    
    try {
      isFetching = true;
      loading = true;
      error = null;

      // Step 1: Setup configuration and loading state
      const { allConfigs, publicationConfigs, otherConfigs, kind0Config } = setupFetchConfiguration();
      
      // Step 2: Fetch non-publication events
      const nonPublicationEvents = await fetchNonPublicationEvents(otherConfigs);
      
      // Step 3: Fetch publication index events
      const validIndexEvents = await fetchPublicationIndexEvents(publicationConfigs);
      
      // Step 4: Extract and fetch content events
      const contentEvents = await fetchContentEvents(validIndexEvents, publicationConfigs);
      
      // Step 5: Deduplicate and combine all events
      // Combine all events (relays handle deduplication)
      const combinedEvents = [
        ...nonPublicationEvents,
        ...Array.from(validIndexEvents),
        ...Array.from(contentEvents)
      ];
      debug("Combined events:", { combinedEvents: combinedEvents.length });
      
      // Update state
      allEvents = combinedEvents;
      followListEvents = [];
      baseEvents = [...allEvents]; // Store base events for tag expansion
      
      // Step 6: Fetch profiles for discovered pubkeys
      const eventsWithProfiles = await fetchProfilesForEvents(combinedEvents, kind0Config);
      
      // Step 7: Apply display limits and finalize
      finalizeEventFetch(eventsWithProfiles);
      
    } catch (e) {
      console.error("Error fetching events:", e);
      error = e instanceof Error ? e.message : String(e);
    } finally {
      loading = false;
      isFetching = false;
      debug("Loading set to false in fetchEvents");
      debug("Final state check - loading:", loading, "events.length:", events.length, "allEvents.length:", allEvents.length);
    }
  }

  /**
   * Step 1: Setup configuration and loading state
   */
  function setupFetchConfiguration() {
    const config = get(visualizationConfig);
    const allConfigs = config.eventConfigs;
    
    debug("All event configs:", allConfigs);
    debug("Enabled kinds:", allConfigs.filter(ec => ec.enabled !== false).map(ec => ec.kind));
    
    // Set loading event kinds for display (show all being loaded)
    loadingEventKinds = allConfigs.map(ec => ({
      kind: ec.kind,
      limit: ec.limit
    }));
    
    // Separate publication kinds from other kinds
    const publicationKinds = [30040, 30041, 30818];
    const publicationConfigs = allConfigs.filter(ec => publicationKinds.includes(ec.kind));
    const otherConfigs = allConfigs.filter(ec => !publicationKinds.includes(ec.kind));
    
    // Find kind 0 config for profile fetching
    const kind0Config = otherConfigs.find(c => c.kind === 0);
    
    return { allConfigs, publicationConfigs, otherConfigs, kind0Config };
  }

  /**
   * Step 2: Fetch non-publication events (kinds 1, 3, etc. but NOT kind 0)
   */
  async function fetchNonPublicationEvents(otherConfigs: any[]): Promise<NDKEvent[]> {
    const nonProfileConfigs = otherConfigs.filter(c => c.kind !== 0);
    let allFetchedEvents: NDKEvent[] = [];
    
    if (nonProfileConfigs.length > 0) {
      debug("Fetching non-publication events (excluding profiles):", nonProfileConfigs);
      
      for (const config of nonProfileConfigs) {
        try {
          // Special handling for kind 3 (follow lists)
          if (config.kind === 3) {
            const followEvents = await fetchFollowLists(config);
            allFetchedEvents.push(...followEvents);
          } else {
            const fetchedEvents = await $ndkInstance.fetchEvents(
              { 
                kinds: [config.kind], 
                limit: config.limit 
              },
              {
                groupable: true,
                skipVerification: false,
                skipValidation: false,
              }
            );
            debug(`Fetched ${fetchedEvents.size} events of kind ${config.kind}`);
            allFetchedEvents.push(...Array.from(fetchedEvents));
          }
        } catch (e) {
          console.error(`Error fetching kind ${config.kind}:`, e);
        }
      }
    }
    
    return allFetchedEvents;
  }

  /**
   * Step 3: Fetch publication index events
   */
  async function fetchPublicationIndexEvents(publicationConfigs: any[]): Promise<Set<NDKEvent>> {
    const shouldFetchIndex = publicationConfigs.some(ec => ec.kind === INDEX_EVENT_KIND);

    if (data.eventId) {
      // Fetch specific publication
      debug(`Fetching specific publication: ${data.eventId}`);
      const event = await $ndkInstance.fetchEvent(data.eventId);
      
      if (!event) {
        throw new Error(`Publication not found: ${data.eventId}`);
      }
      
      if (event.kind !== INDEX_EVENT_KIND) {
        throw new Error(`Event ${data.eventId} is not a publication index (kind ${INDEX_EVENT_KIND})`);
      }
      
      return new Set([event]);
    } else if (!shouldFetchIndex) {
      debug("Index events (30040) are disabled, skipping fetch");
      return new Set();
    } else {
      // Original behavior: fetch all publications
      debug(`Fetching index events (kind ${INDEX_EVENT_KIND})`);
      const indexConfig = publicationConfigs.find(ec => ec.kind === INDEX_EVENT_KIND);
      const indexLimit = indexConfig?.limit || 20;
      
      const indexEvents = await $ndkInstance.fetchEvents(
        { 
          kinds: [INDEX_EVENT_KIND], 
          limit: indexLimit
        },
        {
          groupable: true,
          skipVerification: false,
          skipValidation: false,
        },
      );
      debug("Fetched index events:", indexEvents.size);

      // Filter valid index events according to NIP-62
      const validIndexEvents = filterValidIndexEvents(indexEvents);
      debug("Valid index events after filtering:", validIndexEvents.size);
      
      return validIndexEvents;
    }
  }

  /**
   * Step 4: Extract and fetch content events
   */
  async function fetchContentEvents(validIndexEvents: Set<NDKEvent>, publicationConfigs: any[]): Promise<Set<NDKEvent>> {
    // Extract content event references from index events
    const contentReferences = extractContentReferences(validIndexEvents);
    debug("Content references to fetch:", contentReferences.size);

    // Fetch the referenced content events with author filter
    const enabledPublicationKinds = publicationConfigs.map(ec => ec.kind);
    const enabledContentKinds = CONTENT_EVENT_KINDS.filter(kind => enabledPublicationKinds.includes(kind));
    debug(`Fetching content events (enabled kinds: ${enabledContentKinds.join(', ')})`);
    
    // Group by author to make more efficient queries
    const referencesByAuthor = groupContentReferencesByAuthor(contentReferences, enabledContentKinds);
    
    // Fetch events for each author
    const contentEventPromises = Array.from(referencesByAuthor.entries()).map(
      async ([author, refs]) => {
        const dTags = [...new Set(refs.map(r => r.dTag))]; // Dedupe d-tags
        return $ndkInstance.fetchEvents({
          kinds: enabledContentKinds, // Only fetch enabled kinds
          authors: [author],
          "#d": dTags,
        });
      }
    );
    
    const contentEventSets = await Promise.all(contentEventPromises);
    
    // Combine all content events (relays handle deduplication)
    const contentEvents = new Set<NDKEvent>();
    contentEventSets.forEach(eventSet => {
      eventSet.forEach(event => contentEvents.add(event));
    });
    debug("Fetched content events:", contentEvents.size);
    
    return contentEvents;
  }

  /**
   * Extract content event references from index events
   */
  function extractContentReferences(validIndexEvents: Set<NDKEvent>): Map<string, { kind: number; pubkey: string; dTag: string }> {
    const contentReferences = new Map<string, { kind: number; pubkey: string; dTag: string }>();
    
    validIndexEvents.forEach((event) => {
      const aTags = event.getMatchingTags("a");
      debug(`Event ${event.id} has ${aTags.length} a-tags`);
      
      aTags.forEach((tag) => {
        // Parse the 'a' tag identifier: kind:pubkey:d-tag
        if (tag[1]) {
          const parts = tag[1].split(':');
          if (parts.length >= 3) {
            const kind = parseInt(parts[0]);
            const pubkey = parts[1];
            const dTag = parts.slice(2).join(':'); // Handle d-tags with colons
            
            // Only add if it's a content event kind we're interested in
            if (CONTENT_EVENT_KINDS.includes(kind)) {
              const key = `${kind}:${pubkey}:${dTag}`;
              contentReferences.set(key, { kind, pubkey, dTag });
            }
          }
        }
      });
    });
    
    return contentReferences;
  }

  /**
   * Group content references by author for efficient fetching
   */
  function groupContentReferencesByAuthor(
    contentReferences: Map<string, { kind: number; pubkey: string; dTag: string }>,
    enabledContentKinds: number[]
  ): Map<string, Array<{ kind: number; dTag: string }>> {
    const referencesByAuthor = new Map<string, Array<{ kind: number; dTag: string }>>();
    
    contentReferences.forEach(({ kind, pubkey, dTag }) => {
      // Only include references for enabled kinds
      if (enabledContentKinds.includes(kind)) {
        if (!referencesByAuthor.has(pubkey)) {
          referencesByAuthor.set(pubkey, []);
        }
        referencesByAuthor.get(pubkey)!.push({ kind, dTag });
      }
    });
    
    return referencesByAuthor;
  }

  // Removed deduplication import - relays handle this properly

  /**
   * Step 6: Fetch profiles for discovered pubkeys
   */
  async function fetchProfilesForEvents(combinedEvents: NDKEvent[], kind0Config: any): Promise<NDKEvent[]> {
    // Extract all pubkeys and fetch profiles
    debug("Extracting pubkeys from all events");
    
    // Use the utility function to extract ALL pubkeys (authors + p tags + content)
    const allPubkeys = extractPubkeysFromEvents(combinedEvents);
    
    // Check if follow list is configured with limit > 0
    const allConfigs = get(visualizationConfig).eventConfigs;
    const followListConfig = allConfigs.find(c => c.kind === 3);
    const shouldIncludeFollowPubkeys = followListConfig && followListConfig.limit > 0;
    
    // Add pubkeys from follow lists only if follow list limit > 0
    if (shouldIncludeFollowPubkeys && followListEvents.length > 0) {
      debug("Including pubkeys from follow lists (limit > 0)");
      followListEvents.forEach(event => {
        if (event.pubkey) allPubkeys.add(event.pubkey);
        event.tags.forEach(tag => {
          if (tag[0] === 'p' && tag[1]) {
            allPubkeys.add(tag[1]);
          }
        });
      });
    } else if (!shouldIncludeFollowPubkeys && followListEvents.length > 0) {
      debug("Excluding follow list pubkeys (limit = 0, only fetching event authors)");
    }
    
    debug("Profile extraction complete:", {
      totalPubkeys: allPubkeys.size,
      fromEvents: combinedEvents.length,
      fromFollowLists: followListEvents.length
    });
    
    // Fetch ALL profiles if kind 0 is enabled
    let profileEvents: NDKEvent[] = [];
    if (kind0Config) {
      debug("Fetching profiles for all discovered pubkeys");
      
      // Update progress during fetch
      profileLoadingProgress = { current: 0, total: allPubkeys.size };
      
      profileEvents = await batchFetchProfiles(
        Array.from(allPubkeys),
        (fetched, total) => {
          profileLoadingProgress = { current: fetched, total };
        }
      );
      
      profileLoadingProgress = null;
      debug("Profile fetch complete, fetched", profileEvents.length, "profiles");
      
      // Add profile events to allEvents
      allEvents = [...combinedEvents, ...profileEvents];
      
      // Update profile stats for display
      // Use the total number of pubkeys, not just newly fetched profiles
      profileStats = {
        totalFetched: allPubkeys.size,
        displayLimit: kind0Config.limit
      };
    } else {
      allEvents = [...combinedEvents];
    }
    
    return allEvents;
  }

  /**
   * Step 7: Apply display limits and finalize
   */
  function finalizeEventFetch(eventsWithProfiles: NDKEvent[]) {
    // Update allEvents - events will be automatically filtered via $derived
    allEvents = eventsWithProfiles;
    
    debug("Total events fetched:", eventsWithProfiles.length);
    debug("Events displayed:", events.length);
    debug("Missing event IDs:", missingEventIds.size);
    debug("About to set loading to false");
    debug("Current loading state:", loading);
  }


  /**
   * Updates final state after tag expansion (display limits, missing events)
   * 
   * @param newPublications Array of new publication events
   * @param newContentEvents Array of new content events
   */
  function updateFinalState(newPublications: NDKEvent[], newContentEvents: NDKEvent[]) {
    debug("Events after expansion:", {
      base: baseEvents.length,
      newPubs: newPublications.length,
      newContent: newContentEvents.length,
      totalFetched: allEvents.length,
      displayed: events.length,
      missing: missingEventIds.size,
      searchMode: $visualizationConfig.searchThroughFetched ? "fetched" : "relays"
    });
  }

  /**
   * Handles tag expansion to fetch related publications
   * 
   * REFACTORED: This function has been broken down into smaller, focused steps:
   * 1. Fetch/find tagged events using utility functions
   * 2. Deduplicate events by coordinate using utility function  
   * 3. Fetch profiles for new events using utility function
   * 4. Update final state (display limits, missing events)
   */
  async function handleTagExpansion(tags: string[]) {
    debug("Handling tag expansion", { tags, searchThroughFetched: $visualizationConfig.searchThroughFetched });
    
    if (tags.length === 0) {
      // Reset to base events only
      allEvents = [...baseEvents];
      return;
    }
    
    try {
      // Don't show loading spinner for incremental updates
      error = null;
      
      // Keep track of existing event IDs to avoid duplicates
      const existingEventIds = new Set(baseEvents.map(e => e.id));
      
      let newPublications: NDKEvent[] = [];
      let newContentEvents: NDKEvent[] = [];
      
      // Step 1: Fetch or find tagged events using utility functions
      if ($visualizationConfig.searchThroughFetched) {
        // Search through already fetched events only
        const result = findTaggedEventsInFetched(
          allEvents,
          tags,
          existingEventIds,
          baseEvents,
          debug
        );
        newPublications = result.publications;
        newContentEvents = result.contentEvents;
      } else {
        // Fetch from relays using the utility function
        const result = await fetchTaggedEventsFromRelays(
          tags,
          existingEventIds,
          baseEvents,
          debug
        );
        newPublications = result.publications;
        newContentEvents = result.contentEvents;
      }
      
      // Step 2: Deduplicate events by coordinate using existing utility function
      allEvents = deduplicateAndCombineEvents(
        baseEvents, // nonPublicationEvents
        new Set(newPublications), // validIndexEvents
        new Set(newContentEvents) // contentEvents
      );
      
      // Step 3: Fetch profiles for new events using utility function
      await fetchProfilesForNewEvents(
        newPublications,
        newContentEvents,
        (progress: { current: number; total: number } | null) => { profileLoadingProgress = progress; },
        debug
      );
      
      // Step 4: Update final state (display limits, missing events)
      updateFinalState(newPublications, newContentEvents);
      
    } catch (e) {
      console.error("Error expanding tags:", e);
      error = e instanceof Error ? e.message : String(e);
    }
  }



  


  /**
   * Clears all accumulated events
   */
  function clearEvents() {
    allEvents = [];
    baseEvents = [];
    followListEvents = [];
    
    // Clear node positions cache in EventNetwork
    // This will be handled by the component when events change
  }

  // Fetch events when component mounts
  onMount(() => {
    debug("Component mounted");
    fetchEvents();
  });
</script>

<div class="leather w-full p-4 relative">
  <!-- Header with title and settings button -->
  <div class="flex items-center mb-4">
    <h1 class="h-leather">
      {data.eventId ? 'Publication Visualization' : 'Publication Network'}
    </h1>
  </div>
  <!-- Loading spinner -->
  {#if loading}
    <div class="flex flex-col justify-center items-center h-64 gap-4">
      {debug("TEMPLATE: Loading is true, events.length =", events.length, "allEvents.length =", allEvents.length)}
      <div role="status">
        <svg
          aria-hidden="true"
          class="w-8 h-8 text-gray-200 animate-spin dark:text-gray-600 fill-blue-600"
          viewBox="0 0 100 101"
          fill="none"
          xmlns="http://www.w3.org/2000/svg"
        >
          <path
            d="M100 50.5908C100 78.2051 77.6142 100.591 50 100.591C22.3858 100.591 0 78.2051 0 50.5908C0 22.9766 22.3858 0.59082 50 0.59082C77.6142 0.59082 100 22.9766 100 50.5908ZM9.08144 50.5908C9.08144 73.1895 27.4013 91.5094 50 91.5094C72.5987 91.5094 90.9186 73.1895 90.9186 50.5908C90.9186 27.9921 72.5987 9.67226 50 9.67226C27.4013 9.67226 9.08144 27.9921 9.08144 50.5908Z"
            fill="currentColor"
          />
          <path
            d="M93.9676 39.0409C96.393 38.4038 97.8624 35.9116 97.0079 33.5539C95.2932 28.8227 92.871 24.3692 89.8167 20.348C85.8452 15.1192 80.8826 10.7238 75.2124 7.41289C69.5422 4.10194 63.2754 1.94025 56.7698 1.05124C51.7666 0.367541 46.6976 0.446843 41.7345 1.27873C39.2613 1.69328 37.813 4.19778 38.4501 6.62326C39.0873 9.04874 41.5694 10.4717 44.0505 10.1071C47.8511 9.54855 51.7191 9.52689 55.5402 10.0491C60.8642 10.7766 65.9928 12.5457 70.6331 15.2552C75.2735 17.9648 79.3347 21.5619 82.5849 25.841C84.9175 28.9121 86.7997 32.2913 88.1811 35.8758C89.083 38.2158 91.5421 39.6781 93.9676 39.0409Z"
            fill="currentFill"
          />
        </svg>
        <span class="sr-only">Loading...</span>
      </div>
      
      <!-- Loading message with event kinds -->
      <div class="text-center">
        <p class="text-gray-600 dark:text-gray-400 mb-2">Loading</p>
        <div class="flex flex-wrap justify-center gap-2 max-w-md">
          {#each loadingEventKinds as config}
            <div class="flex items-center gap-1 px-2 py-1 rounded bg-gray-100 dark:bg-gray-800">
              <span 
                class="w-3 h-3 rounded-full inline-block"
                style="background-color: {getEventKindColor(config.kind)};"
              ></span>
              <span class="text-sm text-gray-700 dark:text-gray-300">
                {getEventKindName(config.kind)}: {config.limit}
              </span>
            </div>
          {/each}
        </div>
        
        <!-- Profile loading progress bar -->
        {#if profileLoadingProgress}
          <div class="mt-4">
            <p class="text-sm text-gray-600 dark:text-gray-400 mb-2">
              {profileLoadingMessage}
            </p>
            <div class="w-full bg-gray-200 dark:bg-gray-700 rounded-full h-2">
              <div 
                class="bg-blue-600 h-2 rounded-full transition-all duration-300"
                style="width: {(profileLoadingProgress.current / profileLoadingProgress.total) * 100}%"
              ></div>
            </div>
          </div>
        {/if}
      </div>
    </div>
  <!-- Error message -->
  {:else if error}
    <div
      class="p-4 mb-4 text-sm text-red-800 rounded-lg bg-red-50 dark:bg-red-900 dark:text-red-400"
      role="alert"
    >
      <p class="font-bold mb-2">Error loading network:</p>
      <p class="mb-3">{error}</p>
      <button
        type="button"
        class="text-white bg-red-700 hover:bg-red-800 focus:ring-4 focus:ring-red-300 font-medium rounded-lg text-sm px-5 py-2.5 mt-2 dark:bg-red-600 dark:hover:bg-red-700 focus:outline-none dark:focus:ring-red-800"
        onclick={fetchEvents}
      >
        Retry
      </button>
    </div>
  <!-- Network visualization -->
  {:else}
    <!-- Profile loading progress bar (overlay when loading profiles after initial load) -->
    {#if profileLoadingProgress}
      <div class="absolute top-0 left-0 right-0 z-10 p-4">
        <div class="bg-white dark:bg-gray-800 rounded-lg shadow-lg p-3">
          <p class="text-sm text-gray-600 dark:text-gray-400 mb-2">
            {profileLoadingMessage}
          </p>
          <div class="w-full bg-gray-200 dark:bg-gray-700 rounded-full h-2">
            <div 
              class="bg-blue-600 h-2 rounded-full transition-all duration-300"
              style="width: {(profileLoadingProgress.current / profileLoadingProgress.total) * 100}%"
            ></div>
          </div>
        </div>
      </div>
    {/if}
    
    <!-- Event network visualization -->
    <EventNetwork 
      {events}
      {followListEvents}
      totalCount={allEvents.length}
      onupdate={fetchEvents}
      onclear={clearEvents}
      onTagExpansionChange={handleTagExpansion}
      {profileStats}
      {allEventCounts}
    />
  {/if}
</div>