/**
 * Relay manager for user relay preferences
 * Handles inbox/outbox relays and blocked relays
 */

import { fetchRelayLists } from '../user-data.js';
import { getBlockedRelays } from '../nostr/auth-handler.js';
import { config } from './config.js';
import { sessionManager } from '../auth/session-manager.js';
import { nostrClient } from './nostr-client.js';
import { KIND } from '../../types/kind-lookup.js';
import type { NostrEvent } from '../../types/nostr.js';

class RelayManager {
  private userInbox: string[] = [];
  private userOutbox: string[] = [];
  private userLocalRelaysRead: string[] = []; // Local relays (kind 10432) marked read or unmarked
  private userLocalRelaysWrite: string[] = []; // Local relays (kind 10432) marked write or unmarked
  private blockedRelays: Set<string> = new Set();

  /**
   * Load user relay preferences
   */
  async loadUserPreferences(pubkey: string): Promise<void> {
    try {
      // Fetch relay lists (includes both kind 10002 and 10432) with timeout
      const { inbox, outbox } = await Promise.race([
        fetchRelayLists(pubkey),
        new Promise<{ inbox: string[]; outbox: string[] }>((resolve) => 
          setTimeout(() => resolve({ inbox: [], outbox: [] }), 5000)
        )
      ]);
      this.userInbox = inbox;
      this.userOutbox = outbox;
    } catch (error) {
      // If relay list fetch fails, use empty lists (default relays will be used)
      this.userInbox = [];
      this.userOutbox = [];
    }

    try {
      // Also fetch local relays separately to track read/write indicators
      // Local relays are used as external cache
      const relayList = [
        ...config.defaultRelays,
        ...config.profileRelays
      ];
      const localRelayEvents = await Promise.race([
        nostrClient.fetchEvents(
          [{ kinds: [KIND.LOCAL_RELAYS], authors: [pubkey], limit: 1 }],
          relayList,
          { useCache: true, cacheResults: true, timeout: 5000 }
        ),
        new Promise<NostrEvent[]>((resolve) => 
          setTimeout(() => resolve([]), 5000)
        )
      ]);

      const localRelaysRead: string[] = [];
      const localRelaysWrite: string[] = [];
      
      for (const event of localRelayEvents) {
        for (const tag of event.tags) {
          if (tag[0] === 'r' && tag[1]) {
            const url = tag[1].trim();
            if (!url) continue;

            const markers = tag.slice(2);
            
            // If no markers, relay is both read and write
            if (markers.length === 0) {
              if (!localRelaysRead.includes(url)) {
                localRelaysRead.push(url);
              }
              if (!localRelaysWrite.includes(url)) {
                localRelaysWrite.push(url);
              }
              continue;
            }

            // Check for explicit markers
            const hasRead = markers.includes('read');
            const hasWrite = markers.includes('write');

            // Determine read/write permissions
            // If only 'read' marker: read=true, write=false
            // If only 'write' marker: read=false, write=true
            // If both or neither: both true (default behavior)
            const read = hasRead || (!hasRead && !hasWrite);
            const write = hasWrite || (!hasRead && !hasWrite);

            if (read && !localRelaysRead.includes(url)) {
              localRelaysRead.push(url);
            }
            if (write && !localRelaysWrite.includes(url)) {
              localRelaysWrite.push(url);
            }
          }
        }
      }
      this.userLocalRelaysRead = localRelaysRead;
      this.userLocalRelaysWrite = localRelaysWrite;
    } catch (error) {
      // If local relay fetch fails, use empty lists
      this.userLocalRelaysRead = [];
      this.userLocalRelaysWrite = [];
    }

    // Get blocked relays
    this.blockedRelays = getBlockedRelays();
  }

  /**
   * Clear user preferences (on logout)
   */
  clearUserPreferences(): void {
    this.userInbox = [];
    this.userOutbox = [];
    this.userLocalRelaysRead = [];
    this.userLocalRelaysWrite = [];
    this.blockedRelays.clear();
  }

  /**
   * Filter out blocked relays
   */
  private filterBlocked(relays: string[]): string[] {
    if (this.blockedRelays.size === 0) return relays;
    return relays.filter((r) => !this.blockedRelays.has(r));
  }

  /**
   * Normalize and deduplicate relay URLs
   */
  private normalizeRelays(relays: string[]): string[] {
    // Normalize URLs (remove trailing slashes, etc.)
    const normalized = relays.map((r) => {
      let url = r.trim();
      if (url.endsWith('/')) {
        url = url.slice(0, -1);
      }
      return url;
    });

    // Deduplicate
    return [...new Set(normalized)];
  }

  /**
   * Get relays for reading operations
   */
  getReadRelays(baseRelays: string[], includeUserInbox = true): string[] {
    let relays = [...baseRelays];

    // Add user inbox if logged in
    if (includeUserInbox && sessionManager.isLoggedIn() && this.userInbox.length > 0) {
      relays = [...relays, ...this.userInbox];
    }

    // Add local relays marked for read (used as external cache)
    if (includeUserInbox && sessionManager.isLoggedIn() && this.userLocalRelaysRead.length > 0) {
      relays = [...relays, ...this.userLocalRelaysRead];
    }

    // Normalize and deduplicate
    relays = this.normalizeRelays(relays);

    // Filter blocked relays
    return this.filterBlocked(relays);
  }

  /**
   * Get relays for publishing operations
   */
  getPublishRelays(baseRelays: string[], includeUserOutbox = true): string[] {
    let relays = [...baseRelays];

    // Add user outbox if logged in
    if (includeUserOutbox && sessionManager.isLoggedIn() && this.userOutbox.length > 0) {
      relays = [...relays, ...this.userOutbox];
    }

    // Add local relays marked for write (used as external cache)
    if (includeUserOutbox && sessionManager.isLoggedIn() && this.userLocalRelaysWrite.length > 0) {
      relays = [...relays, ...this.userLocalRelaysWrite];
    }

    // Normalize and deduplicate
    relays = this.normalizeRelays(relays);

    // Filter blocked relays
    return this.filterBlocked(relays);
  }

  /**
   * Get relays for reading threads (kind 11)
   */
  getThreadReadRelays(): string[] {
    return this.getReadRelays(config.defaultRelays);
  }

  /**
   * Get relays for reading comments (kind 1111)
   */
  getCommentReadRelays(): string[] {
    return this.getReadRelays(config.defaultRelays);
  }

  /**
   * Get relays for reading kind 1 feed
   */
  getFeedReadRelays(): string[] {
    return this.getReadRelays(config.defaultRelays);
  }

  /**
   * Get relays for reading kind 1 responses
   */
  getFeedResponseReadRelays(): string[] {
    return this.getReadRelays([
      ...config.defaultRelays,
      'wss://aggr.nostr.land'
    ]);
  }


  /**
   * Get relays for reading profiles (kind 0)
   */
  getProfileReadRelays(): string[] {
    return this.getReadRelays([
      ...config.defaultRelays,
      ...config.profileRelays
    ]);
  }

  /**
   * Get all available relays (for comprehensive searches)
   * Combines default relays, profile relays, and user relays
   */
  getAllAvailableRelays(): string[] {
    const allBaseRelays = [
      ...config.defaultRelays,
      ...config.profileRelays
    ];
    return this.getReadRelays(allBaseRelays, true);
  }

  /**
   * Get relays for reading payment targets (kind 10133)
   */
  getPaymentTargetReadRelays(): string[] {
    return this.getReadRelays([
      ...config.defaultRelays,
      ...config.profileRelays
    ]);
  }

  /**
   * Get relays for reading user status (kind 30315)
   */
  getUserStatusReadRelays(): string[] {
    return this.getReadRelays([
      ...config.defaultRelays,
      ...config.profileRelays
    ]);
  }

  /**
   * Get relays for publishing threads (kind 11)
   */
  getThreadPublishRelays(): string[] {
    return this.getPublishRelays([
      ...config.defaultRelays,
      ...config.threadPublishRelays
    ]);
  }

  /**
   * Get relays for publishing comments (kind 1111)
   * If replying, include target's inbox and relay hints from the event being replied to
   */
  getCommentPublishRelays(targetInbox?: string[], replyRelayHints?: string[]): string[] {
    let relays = this.getPublishRelays(config.defaultRelays);

    // If replying to an event with relay hints, add them
    if (replyRelayHints && replyRelayHints.length > 0) {
      relays = [...relays, ...replyRelayHints];
    }

    // If replying, add target's inbox
    if (targetInbox && targetInbox.length > 0) {
      relays = [...relays, ...targetInbox];
    }

    // Normalize and filter after combining all relays
    relays = this.normalizeRelays(relays);
    relays = this.filterBlocked(relays);

    return relays;
  }

  /**
   * Get relays for publishing kind 1 posts
   * If replying, include target's inbox and relay hints from the event being replied to
   */
  getFeedPublishRelays(targetInbox?: string[], replyRelayHints?: string[]): string[] {
    let relays = this.getPublishRelays(config.defaultRelays);

    // If replying to an event with relay hints, add them
    if (replyRelayHints && replyRelayHints.length > 0) {
      relays = [...relays, ...replyRelayHints];
    }

    // If replying, add target's inbox
    if (targetInbox && targetInbox.length > 0) {
      relays = [...relays, ...targetInbox];
    }

    // Normalize and filter after combining all relays
    relays = this.normalizeRelays(relays);
    relays = this.filterBlocked(relays);

    return relays;
  }

  /**
   * Get relays for publishing reactions (kind 7)
   * If reacting to an event, include relay hints from that event
   * Includes user outbox and local relays, excludes read-only relays (aggregators)
   */
  getReactionPublishRelays(reactionRelayHints?: string[]): string[] {
    // Start with default relays, excluding read-only relays
    const baseRelays = config.defaultRelays.filter(
      relay => !config.readOnlyRelays.includes(relay)
    );
    
    // Get publish relays (includes user outbox and local relays)
    let relays = this.getPublishRelays(baseRelays, true);

    // If reacting to an event with relay hints, add them (but filter out read-only)
    if (reactionRelayHints && reactionRelayHints.length > 0) {
      const filteredHints = reactionRelayHints.filter(
        relay => !config.readOnlyRelays.includes(relay)
      );
      relays = [...relays, ...filteredHints];
    }

    // Normalize and filter after combining all relays
    relays = this.normalizeRelays(relays);
    relays = this.filterBlocked(relays);

    // Ensure we always have at least the default relays (minus aggregators) to publish to
    if (relays.length === 0) {
      // Fallback to default relays if we somehow ended up with an empty list
      relays = baseRelays.length > 0 ? baseRelays : config.defaultRelays.filter(
        relay => !config.readOnlyRelays.includes(relay)
      );
    }

    // Log for debugging
    console.log('[RelayManager] Reaction publish relays:', {
      baseRelays,
      userOutbox: this.userOutbox,
      userLocalRelaysWrite: this.userLocalRelaysWrite,
      reactionRelayHints,
      finalRelays: relays
    });

    return relays;
  }

  /**
   * Get relays for publishing file metadata (kind 1063)
   * Includes GIF relays in addition to normal publish relays
   */
  getFileMetadataPublishRelays(): string[] {
    // Start with normal publish relays
    let relays = this.getPublishRelays(config.defaultRelays);
    
    // Add GIF relays
    relays = [...relays, ...config.gifRelays];
    
    // Normalize and deduplicate
    relays = this.normalizeRelays(relays);
    
    // Filter blocked relays
    return this.filterBlocked(relays);
  }

  /**
   * Update blocked relays (called when user preferences change)
   */
  updateBlockedRelays(blocked: Set<string>): void {
    this.blockedRelays = blocked;
  }

  /**
   * Get local relays (kind 10432) - both read and write
   */
  getLocalRelays(): string[] {
    const allLocalRelays = new Set<string>();
    this.userLocalRelaysRead.forEach(r => allLocalRelays.add(r));
    this.userLocalRelaysWrite.forEach(r => allLocalRelays.add(r));
    return Array.from(allLocalRelays);
  }
}

export const relayManager = new RelayManager();