import { Link } from 'react-router-dom';
import { nip19 } from 'nostr-tools';
import { Users, Check, Clock, ShieldCheck, EyeOff } from 'lucide-react';
import { Card, CardContent, CardHeader, CardTitle } from '@/components/ui/card';
import { Avatar, AvatarFallback, AvatarImage } from '@/components/ui/avatar';
import { Skeleton } from '@/components/ui/skeleton';
import {
  Tooltip,
  TooltipContent,
  TooltipProvider,
  TooltipTrigger,
} from '@/components/ui/tooltip';
import { useAuthor } from '@/hooks/useAuthor';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { genUserName } from '@/lib/genUserName';
import { useCollectiveMembers, type CollectiveMember } from '@/hooks/useCollectiveMembers';
import { cn } from '@/lib/utils';

interface CollectiveMembersProps {
  kind: number;
  founderPubkey: string;
  identifier: string;
  claimedMembers: string[];
  /** Delegated admin pubkeys (subset of members). */
  admins?: string[];
  accentText?: string;
  accentBorder?: string;
}

function StatusChip({ status }: { status: CollectiveMember['status'] }) {
  if (status === 'confirmed') {
    return (
      <span className="inline-flex items-center gap-1 rounded-full bg-green-500/15 px-2 py-0.5 text-xs font-bold text-green-500">
        <Check className="h-3 w-3" /> Confirmed
      </span>
    );
  }
  return (
    <TooltipProvider>
      <Tooltip>
        <TooltipTrigger asChild>
          <span className="inline-flex items-center gap-1 rounded-full bg-amber-500/10 px-2 py-0.5 text-xs font-bold text-amber-500">
            <Clock className="h-3 w-3" /> Pending
          </span>
        </TooltipTrigger>
        <TooltipContent>
          Listed by the collective — awaiting this member’s confirmation.
        </TooltipContent>
      </Tooltip>
    </TooltipProvider>
  );
}

function AdminChip() {
  return (
    <span className="inline-flex items-center gap-1 rounded-full bg-teal-500/15 px-2 py-0.5 text-xs font-bold text-teal-300">
      <ShieldCheck className="h-3 w-3" /> Admin
    </span>
  );
}

function CrewOnlyChip() {
  return (
    <TooltipProvider>
      <Tooltip>
        <TooltipTrigger asChild>
          <span className="inline-flex items-center gap-1 rounded-full bg-white/10 px-2 py-0.5 text-xs font-bold text-gray-300">
            <EyeOff className="h-3 w-3" /> Crew only
          </span>
        </TooltipTrigger>
        <TooltipContent>
          This member chose to be visible only to crew-mates. You can see them
          because you're in the crew.
        </TooltipContent>
      </Tooltip>
    </TooltipProvider>
  );
}

function MemberRow({ member, isAdmin }: { member: CollectiveMember; isAdmin: boolean }) {
  const author = useAuthor(member.pubkey);
  const metadata = author.data?.metadata;
  const name = metadata?.name ?? genUserName(member.pubkey);
  const npub = nip19.npubEncode(member.pubkey);

  return (
    <Link
      to={`/${npub}`}
      className="flex items-center gap-3 rounded-lg bg-black/40 p-2 transition-colors hover:bg-black/60"
    >
      <Avatar className="h-9 w-9">
        <AvatarImage src={metadata?.picture} alt={name} />
        <AvatarFallback className="text-xs">{name.slice(0, 2).toUpperCase()}</AvatarFallback>
      </Avatar>
      <span className="min-w-0 flex-1 truncate text-sm font-medium text-gray-200">{name}</span>
      {member.visibility === 'crew' && <CrewOnlyChip />}
      {isAdmin && <AdminChip />}
      <StatusChip status={member.status} />
    </Link>
  );
}

/** Anonymous placeholder shown to NON-members for a `crew`-only member. */
function HiddenMemberRow() {
  return (
    <div className="flex items-center gap-3 rounded-lg bg-black/40 p-2">
      <Avatar className="h-9 w-9">
        <AvatarFallback className="bg-white/5 text-gray-600">
          <EyeOff className="h-4 w-4" />
        </AvatarFallback>
      </Avatar>
      <span className="min-w-0 flex-1 truncate text-sm font-medium text-gray-500 italic">
        Hidden member
      </span>
      <span className="inline-flex items-center gap-1 rounded-full bg-white/5 px-2 py-0.5 text-xs font-bold text-gray-500">
        <EyeOff className="h-3 w-3" /> Crew only
      </span>
    </div>
  );
}

/**
 * Renders a collective's members with confirmed / pending trust chips.
 * Returns null for individuals or collectives with no listed members.
 */
export function CollectiveMembers({
  kind,
  founderPubkey,
  identifier,
  claimedMembers,
  admins = [],
  accentText = 'text-indigo-400',
  accentBorder = 'border-gray-700',
}: CollectiveMembersProps) {
  const { user } = useCurrentUser();
  const { data: members, isLoading } = useCollectiveMembers({
    kind,
    founderPubkey,
    identifier,
    claimedMembers,
    enabled: claimedMembers.length > 0,
  });

  if (claimedMembers.length === 0) return null;

  const adminSet = new Set(admins);
  const confirmedCount = members?.filter((m) => m.status === 'confirmed').length ?? 0;

  // The viewer counts as a crew-mate (can see crew-only members) if they are
  // the founder or a claimed member of this crew.
  const viewerIsCrewmate =
    !!user && (user.pubkey === founderPubkey || claimedMembers.includes(user.pubkey));

  // Admins first, then the hook's existing confirmed-first ordering.
  const orderedMembers = members
    ? [...members].sort((a, b) => {
        const aa = adminSet.has(a.pubkey) ? 1 : 0;
        const ba = adminSet.has(b.pubkey) ? 1 : 0;
        return ba - aa;
      })
    : members;

  // Split into what the viewer may see vs. anonymised "hidden member" slots.
  // A crew-only member is always visible to themselves.
  const isHiddenFromViewer = (m: CollectiveMember) =>
    m.visibility === 'crew' && !viewerIsCrewmate && m.pubkey !== user?.pubkey;

  const visibleMembers = orderedMembers?.filter((m) => !isHiddenFromViewer(m)) ?? [];
  const hiddenCount = orderedMembers?.filter(isHiddenFromViewer).length ?? 0;

  return (
    <Card className={cn('bg-black/90 border-2', accentBorder)}>
      <CardHeader>
        <CardTitle className="flex items-center gap-2 text-lg font-black uppercase text-white">
          <Users className={cn('h-5 w-5', accentText)} />
          Members · {claimedMembers.length}
        </CardTitle>
      </CardHeader>
      <CardContent className="space-y-2">
        <p className="flex items-start gap-1.5 text-xs text-gray-400">
          <ShieldCheck className={cn('mt-0.5 h-3.5 w-3.5 shrink-0', accentText)} />
          <span>
            {confirmedCount > 0
              ? `${confirmedCount} of ${claimedMembers.length} verified — each confirmed member signed with their own Nostr key.`
              : 'Membership is verified per member. Each member confirms with their own Nostr key.'}
            {admins.length > 0 && ` ${admins.length} admin${admins.length !== 1 ? 's' : ''} help run the crew.`}
          </span>
        </p>

        {isLoading ? (
          <div className="space-y-2">
            {claimedMembers.slice(0, 3).map((_, i) => (
              <div key={i} className="flex items-center gap-3 rounded-lg bg-black/40 p-2">
                <Skeleton className="h-9 w-9 rounded-full" />
                <Skeleton className="h-4 flex-1" />
                <Skeleton className="h-5 w-20 rounded-full" />
              </div>
            ))}
          </div>
        ) : (
          <div className="space-y-2">
            {visibleMembers.map((m) => (
              <MemberRow key={m.pubkey} member={m} isAdmin={adminSet.has(m.pubkey)} />
            ))}
            {/* Collapse all crew-only members into anonymous slots for outsiders */}
            {hiddenCount > 0 && (
              <>
                {Array.from({ length: hiddenCount }).map((_, i) => (
                  <HiddenMemberRow key={`hidden-${i}`} />
                ))}
              </>
            )}
          </div>
        )}
      </CardContent>
    </Card>
  );
}