import { useSeoMeta } from '@unhead/react';
import { useMemo } from 'react';
import { Card, CardContent } from '@/components/ui/card';
import { Avatar, AvatarImage, AvatarFallback } from '@/components/ui/avatar';

import { useSkateSpots } from '@/hooks/useSkateSpots';
import { useSkateEvents } from '@/hooks/useSkateEvents';
import { useAuthor } from '@/hooks/useAuthor';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useTrustScore } from '@/hooks/useTrustScore';
import { genUserName } from '@/lib/genUserName';
import { Trophy, Medal } from 'lucide-react';
import { cn } from '@/lib/utils';

function ContributorRow({ pubkey, spots, events, rank }: { pubkey: string; spots: number; events: number; rank: number }) {
  const author = useAuthor(pubkey);
  const { data: trustScore } = useTrustScore(pubkey);
  const metadata = author.data?.metadata;
  const displayName = metadata?.name ?? genUserName(pubkey);
  const total = spots + events;

  const rankColor = rank === 1 ? 'text-yellow-400' : rank === 2 ? 'text-gray-300' : rank === 3 ? 'text-orange-400' : 'text-gray-500';
  const rankEmoji = rank === 1 ? '🥇' : rank === 2 ? '🥈' : rank === 3 ? '🥉' : '';
  
  // Trust score color coding
  const trustScoreColor = trustScore === undefined ? 'text-gray-500' :
                         trustScore >= 80 ? 'text-green-500' :
                         trustScore >= 50 ? 'text-yellow-500' :
                         'text-gray-500';

  return (
    <div className="flex items-center gap-4 p-4 bg-black/50 rounded-lg border border-gray-700 hover:border-[#ff0040]/50 transition-all">
      <div className={`text-3xl font-black ${rankColor} w-12 text-center`}>
        {rankEmoji || `#${rank}`}
      </div>
      <Avatar className="h-12 w-12 border-2 border-[#ff0040]/30">
        <AvatarImage src={metadata?.picture} alt={displayName} />
        <AvatarFallback className="bg-black text-[#ff0040] font-bold">
          {displayName.slice(0, 2).toUpperCase()}
        </AvatarFallback>
      </Avatar>
      <div className="flex-1">
        <div className="font-bold text-white">{displayName}</div>
        {metadata?.nip05 && (
          <div className="flex items-center gap-1 text-xs">
            <div className="w-1.5 h-1.5 rounded-full bg-[#ccff00]" />
            <span className="text-[#ccff00]">{metadata.nip05}</span>
          </div>
        )}
      </div>
      <div className="flex gap-4 text-sm">
        <div className="text-center">
          <div className="text-[#ff0040] font-black">{spots}</div>
          <div className="text-gray-500 text-xs uppercase">Spots</div>
        </div>
        <div className="text-center">
          <div className="text-[#ccff00] font-black">{events}</div>
          <div className="text-gray-500 text-xs uppercase">Events</div>
        </div>
        <div className="text-center">
          <div className="text-[#ff6600] font-black">{total}</div>
          <div className="text-gray-500 text-xs uppercase">Total</div>
        </div>
        <div className="text-center min-w-[48px]">
          <div className={cn("font-black", trustScoreColor)}>
            {trustScore ?? '—'}
          </div>
          <div className="text-gray-500 text-xs uppercase">Trust</div>
        </div>
      </div>
    </div>
  );
}

export default function PyramidPage() {
  useSeoMeta({
    title: 'Pyramid Rankings - SkateSpots',
    description: 'Top contributors and community leaders.',
  });

  const { user } = useCurrentUser();
  const { data: allSpots } = useSkateSpots(500);
  const { data: allEvents } = useSkateEvents(500);
  const { data: userTrustScore } = useTrustScore(user?.pubkey);

  // Calculate contributor rankings
  const rankings = useMemo(() => {
    if (!allSpots && !allEvents) return [];

    const contributorMap = new Map<string, { spots: number; events: number }>();

    // Count spots per contributor
    allSpots?.forEach(spot => {
      const current = contributorMap.get(spot.pubkey) || { spots: 0, events: 0 };
      contributorMap.set(spot.pubkey, { ...current, spots: current.spots + 1 });
    });

    // Count events per contributor
    allEvents?.forEach(event => {
      const current = contributorMap.get(event.pubkey) || { spots: 0, events: 0 };
      contributorMap.set(event.pubkey, { ...current, events: current.events + 1 });
    });

    // Convert to array and sort by total contributions
    return Array.from(contributorMap.entries())
      .map(([pubkey, stats]) => ({
        pubkey,
        spots: stats.spots,
        events: stats.events,
        total: stats.spots + stats.events,
      }))
      .sort((a, b) => b.total - a.total);
  }, [allSpots, allEvents]);

  const userRank = rankings.findIndex(r => r.pubkey === user?.pubkey) + 1;
  const userStats = rankings.find(r => r.pubkey === user?.pubkey);

  return (
    <>
      <div className="container px-4 sm:px-6 py-8 sm:py-12">
        <div className="text-center mb-12">
          <Trophy className="h-16 w-16 mx-auto mb-4 text-orange-500" />
          <h1 className="text-4xl md:text-6xl font-black uppercase mb-4 neon-header">
            <span className="neon-red">PYRAMID</span> <span className="neon-lime">RANKINGS</span>
          </h1>
          <p className="text-gray-400 text-xl">Top contributors in your city</p>
        </div>

        {/* Your Stats */}
        {user && userStats && (
          <Card className="bg-gradient-to-br from-[#ff0040]/20 to-[#ccff00]/20 border-2 border-[#ff0040]/50 max-w-4xl mx-auto mb-8">
            <CardContent className="p-6">
              <div className="flex items-center justify-between">
                <div className="flex items-center gap-4">
                  <div className="text-4xl font-black text-[#ff0040]">#{userRank}</div>
                  <div>
                    <div className="font-black text-xl text-white uppercase">Your Rank</div>
                    <div className="text-sm text-gray-400">Keep contributing to climb higher!</div>
                  </div>
                </div>
                <div className="flex gap-4">
                  <div className="text-center">
                    <div className="text-3xl font-black text-[#ff0040]">{userStats.spots}</div>
                    <div className="text-xs text-gray-400 uppercase">Spots</div>
                  </div>
                  <div className="text-center">
                    <div className="text-3xl font-black text-[#ccff00]">{userStats.events}</div>
                    <div className="text-xs text-gray-400 uppercase">Events</div>
                  </div>
                  <div className="text-center">
                    <div className="text-3xl font-black text-[#ff6600]">{userStats.total}</div>
                    <div className="text-xs text-gray-400 uppercase">Total</div>
                  </div>
                  <div className="text-center">
                    <div className={cn(
                      "text-3xl font-black",
                      userTrustScore === undefined ? "text-gray-500" :
                      userTrustScore >= 80 ? "text-green-500" :
                      userTrustScore >= 50 ? "text-yellow-500" :
                      "text-gray-500"
                    )}>
                      {userTrustScore ?? '—'}
                    </div>
                    <div className="text-xs text-gray-400 uppercase">Trust</div>
                  </div>
                </div>
              </div>
            </CardContent>
          </Card>
        )}

        {/* Leaderboard */}
        <Card className="bg-black/90 border-2 border-gray-700 max-w-4xl mx-auto">
          <CardContent className="p-6">
            <div className="flex items-center gap-3 mb-6">
              <Medal className="h-8 w-8 text-[#ff0040]" />
              <h2 className="text-2xl font-black uppercase">Top Contributors</h2>
            </div>

            {rankings.length > 0 ? (
              <div className="space-y-2">
                {rankings.slice(0, 20).map((contributor, idx) => (
                  <ContributorRow
                    key={contributor.pubkey}
                    pubkey={contributor.pubkey}
                    spots={contributor.spots}
                    events={contributor.events}
                    rank={idx + 1}
                  />
                ))}
              </div>
            ) : (
              <div className="text-center py-12">
                <Trophy className="h-16 w-16 mx-auto mb-4 text-gray-600" />
                <p className="text-gray-400">No contributors yet. Be the first to add a spot or create an event!</p>
              </div>
            )}
          </CardContent>
        </Card>
      </div>
    </>
  );
}