import { useState } from 'react';
import { Users, Check, Loader2, Globe, EyeOff } from 'lucide-react';
import { Card, CardContent } from '@/components/ui/card';
import { Button } from '@/components/ui/button';
import { useCurrentUser } from '@/hooks/useCurrentUser';
import { useCollectiveMembers } from '@/hooks/useCollectiveMembers';
import { useConfirmMembership } from '@/hooks/useMembershipAttestation';
import { useToast } from '@/hooks/useToast';
import { cn } from '@/lib/utils';
import {
  MEMBER_VISIBILITY_DESCRIPTIONS,
  type MemberVisibility,
} from '@/lib/types';

interface ConfirmMembershipCardProps {
  kind: number;
  founderPubkey: string;
  identifier: string;
  collectiveName: string;
  claimedMembers: string[];
  accentBg?: string;
}

/** Two-option visibility picker used both when confirming and when editing. */
export function VisibilityPicker({
  value,
  onChange,
  accentBg = 'bg-indigo-600',
}: {
  value: MemberVisibility;
  onChange: (v: MemberVisibility) => void;
  accentBg?: string;
}) {
  const options: { key: MemberVisibility; label: string; icon: React.ComponentType<{ className?: string }> }[] = [
    { key: 'public', label: 'Public', icon: Globe },
    { key: 'crew', label: 'Crew only', icon: EyeOff },
  ];
  return (
    <div className="space-y-2">
      <div className="grid grid-cols-2 gap-2">
        {options.map(({ key, label, icon: Icon }) => {
          const active = value === key;
          return (
            <button
              key={key}
              type="button"
              onClick={() => onChange(key)}
              className={cn(
                'flex items-center justify-center gap-1.5 rounded-lg border px-3 py-2 text-sm font-bold transition-all active:scale-95',
                active
                  ? cn('border-transparent text-white', accentBg)
                  : 'border-white/10 bg-white/5 text-gray-400 hover:bg-white/10 hover:text-white'
              )}
            >
              <Icon className="h-4 w-4" />
              {label}
            </button>
          );
        })}
      </div>
      <p className="text-xs leading-relaxed text-gray-500">
        {MEMBER_VISIBILITY_DESCRIPTIONS[value]}
      </p>
    </div>
  );
}

/**
 * Shown to a logged-in user who has been LISTED as a member of a collective but
 * has not yet confirmed. Lets them pick their visibility and publishes a NIP-32
 * attestation on click. Hidden for everyone else (non-members, already-confirmed
 * members, the founder).
 */
export function ConfirmMembershipCard({
  kind,
  founderPubkey,
  identifier,
  collectiveName,
  claimedMembers,
  accentBg = 'bg-indigo-600 hover:bg-indigo-700',
}: ConfirmMembershipCardProps) {
  const { user } = useCurrentUser();
  const { toast } = useToast();
  const { mutateAsync: confirm, isPending } = useConfirmMembership();
  const [visibility, setVisibility] = useState<MemberVisibility>('public');
  const { data: members } = useCollectiveMembers({
    kind,
    founderPubkey,
    identifier,
    claimedMembers,
    enabled: claimedMembers.length > 0,
  });

  if (!user) return null;

  const me = user.pubkey.toLowerCase();
  // Only relevant if I'm actually listed as a member and I'm not the founder.
  if (me === founderPubkey.toLowerCase()) return null;
  if (!claimedMembers.includes(me)) return null;

  const myStatus = members?.find((m) => m.pubkey === me)?.status;
  if (myStatus === 'confirmed') return null;

  const handleConfirm = async () => {
    try {
      await confirm({ kind, founderPubkey, identifier, collectiveName, visibility });
      toast({
        title: 'Membership confirmed!',
        description:
          visibility === 'crew'
            ? `You're verified in ${collectiveName} — visible to crew-mates only.`
            : `You now show as a verified member of ${collectiveName}.`,
      });
    } catch (error) {
      toast({
        title: 'Failed to confirm',
        description: error instanceof Error ? error.message : 'Please try again.',
        variant: 'destructive',
      });
    }
  };

  return (
    <Card className="border-2 border-amber-500/50 bg-amber-950/20">
      <CardContent className="space-y-4 p-4">
        <div className="flex items-start gap-3">
          <Users className="mt-0.5 h-6 w-6 shrink-0 text-amber-400" />
          <div>
            <h3 className="font-bold text-amber-300">You've been added to {collectiveName}</h3>
            <p className="text-sm text-gray-300">
              Confirm your membership so it shows as verified on your profile and theirs.
            </p>
          </div>
        </div>

        <div>
          <p className="mb-2 text-xs font-black uppercase tracking-widest text-gray-400">
            Your visibility
          </p>
          <VisibilityPicker value={visibility} onChange={setVisibility} accentBg={accentBg.split(' ')[0]} />
        </div>

        <Button
          type="button"
          onClick={handleConfirm}
          disabled={isPending}
          className={cn('w-full gap-2 font-bold', accentBg)}
        >
          {isPending ? (
            <>
              <Loader2 className="h-4 w-4 animate-spin" /> Confirming…
            </>
          ) : (
            <>
              <Check className="h-4 w-4" /> Confirm Membership
            </>
          )}
        </Button>
      </CardContent>
    </Card>
  );
}