import { useNostr } from '@nostrify/react';
import { useQuery } from '@tanstack/react-query';
import { MARKETPLACE_ITEM_KIND } from '@/lib/types';
import { useAppContext } from '@/hooks/useAppContext';

export interface SellerInfo {
  pubkey: string;
  accountAge: number; // Days since first event
  listingCount: number;
  activeListingCount: number;
  hasNip05: boolean;
  nip05?: string;
  firstSeen?: number; // Unix timestamp of first event
}

/**
 * Hook to fetch seller information including account age and listing count.
 */
export function useSellerInfo(pubkey: string | undefined) {
  const { nostr } = useNostr();
  const { config } = useAppContext();

  const relayUrls = config.relayMetadata.relays
    .filter(r => r.read)
    .map(r => r.url)
    .sort()
    .join(',');

  return useQuery({
    queryKey: ['seller-info', pubkey, relayUrls],
    queryFn: async (c) => {
      if (!pubkey) return null;

      const signal = AbortSignal.any([c.signal, AbortSignal.timeout(10000)]);

      try {
        const readRelays = config.relayMetadata.relays
          .filter(r => r.read)
          .map(r => r.url);

        // Query profile (kind 0) and marketplace listings in parallel
        const profileEventsPromise: Promise<any[]>[] = [];
        const listingEventsPromise: Promise<any[]>[] = [];

        for (const relayUrl of readRelays) {
          try {
            const relay = nostr.relay(relayUrl);
            
            profileEventsPromise.push(
              relay.query(
                [{ kinds: [0], authors: [pubkey], limit: 1 }],
                { signal }
              ).catch(() => [])
            );

            listingEventsPromise.push(
              relay.query(
                [{ 
                  kinds: [MARKETPLACE_ITEM_KIND], 
                  authors: [pubkey],
                  '#t': ['skateboarding'],
                  limit: 100 
                }],
                { signal }
              ).catch(() => [])
            );
          } catch (error) {
            // Ignore individual relay errors
          }
        }

        const [profileResults, listingResults] = await Promise.all([
          Promise.all(profileEventsPromise),
          Promise.all(listingEventsPromise),
        ]);

        // Flatten results
        const profileEvents = profileResults.flat();
        const listingEvents = listingResults.flat();

        // Get profile metadata
        let hasNip05 = false;
        let nip05: string | undefined;
        let profileCreatedAt: number | undefined;

        if (profileEvents.length > 0) {
          const profile = profileEvents.reduce((latest, current) =>
            current.created_at > latest.created_at ? current : latest
          );
          
          try {
            const metadata = JSON.parse(profile.content);
            hasNip05 = !!metadata.nip05;
            nip05 = metadata.nip05;
          } catch (e) {
            // Ignore JSON parse errors
          }
          
          profileCreatedAt = profile.created_at;
        }

        // Deduplicate listings by d-tag
        const listingMap = new Map<string, any>();
        for (const event of listingEvents) {
          const d = event.tags.find(([name]: [string]) => name === 'd')?.[1];
          if (d) {
            const key = `${event.pubkey}:${event.kind}:${d}`;
            const existing = listingMap.get(key);
            if (!existing || event.created_at > existing.created_at) {
              listingMap.set(key, event);
            }
          }
        }

        const uniqueListings = Array.from(listingMap.values());
        
        // Count active listings (not expired, status = active)
        const now = Math.floor(Date.now() / 1000);
        const activeListings = uniqueListings.filter(event => {
          const status = event.tags.find(([name]: [string]) => name === 'status')?.[1];
          const expiration = event.tags.find(([name]: [string]) => name === 'expiration')?.[1];
          
          if (status && status !== 'active') return false;
          if (expiration && parseInt(expiration) < now) return false;
          
          return true;
        });

        // Find oldest event timestamp (approximation of account age)
        const allTimestamps = [
          ...uniqueListings.map(e => e.created_at),
          ...(profileCreatedAt ? [profileCreatedAt] : []),
        ];
        
        const firstSeen = allTimestamps.length > 0 
          ? Math.min(...allTimestamps)
          : undefined;

        const accountAge = firstSeen 
          ? Math.floor((now - firstSeen) / (24 * 60 * 60)) // Days
          : 0;

        return {
          pubkey,
          accountAge,
          listingCount: uniqueListings.length,
          activeListingCount: activeListings.length,
          hasNip05,
          nip05,
          firstSeen,
        } as SellerInfo;
      } catch (error) {
        console.warn('[useSellerInfo] Error fetching seller info:', error);
        return null;
      }
    },
    enabled: !!pubkey,
    staleTime: 300000, // Cache for 5 minutes
    gcTime: 600000, // Keep in cache for 10 minutes
  });
}