'use client';

import { useState } from 'react';
import Link from 'next/link';
import { useParams } from 'next/navigation';
import { useQuery } from '@tanstack/react-query';
import { AlertTriangle, ArrowRight } from 'lucide-react';

import { Button } from '@/components/ui/button';
import { EmptyState } from '@/components/ui/empty-state';
import { StatusPill, type StatusPillStatus } from '@/components/ui/status-pill';
import { apiFetch } from '@/lib/api/client';
import { CatchUpWizard } from '@/components/berths/catch-up-wizard';

interface ReconcileRow {
  id: string;
  mooringNumber: string;
  area: string | null;
  status: string;
  statusLastChangedBy: string | null;
  statusLastChangedReason: string | null;
  statusLastModified: string | null;
}

const STATUS_LABELS: Record<string, string> = {
  available: 'Available',
  under_offer: 'Under Offer',
  sold: 'Sold',
};
const STATUS_PILL: Record<string, StatusPillStatus> = {
  available: 'available',
  under_offer: 'under_offer',
  sold: 'sold',
};

function relativeAge(iso: string | null): string {
  if (!iso) return '—';
  const days = Math.floor((Date.now() - new Date(iso).getTime()) / 86_400_000);
  if (days <= 0) return 'today';
  if (days === 1) return 'yesterday';
  if (days < 30) return `${days}d ago`;
  if (days < 365) return `${Math.floor(days / 30)}mo ago`;
  return `${Math.floor(days / 365)}y ago`;
}

export function ReconcileQueue() {
  const params = useParams<{ portSlug: string }>();
  const portSlug = params?.portSlug ?? '';
  const [wizardBerthId, setWizardBerthId] = useState<string | null>(null);

  const { data, isLoading } = useQuery<{ data: ReconcileRow[]; total: number }>({
    queryKey: ['berths', 'reconcile-queue'],
    queryFn: () => apiFetch('/api/v1/berths/reconcile-queue'),
  });

  if (isLoading) {
    return (
      <ul className="rounded-md border bg-white">
        {[0, 1, 2].map((i) => (
          <li key={i} className="h-14 animate-pulse border-b last:border-b-0 bg-muted/40" />
        ))}
      </ul>
    );
  }

  const rows = data?.data ?? [];

  if (rows.length === 0) {
    return (
      <EmptyState
        icon={<AlertTriangle className="h-7 w-7" aria-hidden />}
        title="Nothing to reconcile"
        body="Every berth that's been flipped manually has a backing interest. Manual status changes will show up here when there's no deal to explain them."
      />
    );
  }

  return (
    <>
      <ul className="rounded-md border bg-white divide-y">
        {rows.map((r) => (
          <li key={r.id} className="flex flex-wrap items-center gap-x-4 gap-y-2 px-4 py-3 text-sm">
            <div className="min-w-0 flex-1">
              <Link
                href={`/${portSlug}/berths/${encodeURIComponent(r.mooringNumber)}`}
                className="font-medium text-foreground hover:text-brand"
              >
                {r.mooringNumber}
              </Link>
              {r.area ? <span className="ml-2 text-xs text-muted-foreground">{r.area}</span> : null}
              {r.statusLastChangedReason ? (
                <p className="mt-0.5 truncate text-xs text-muted-foreground">
                  {r.statusLastChangedReason}
                </p>
              ) : null}
            </div>
            <StatusPill status={STATUS_PILL[r.status] ?? 'pending'}>
              {STATUS_LABELS[r.status] ?? r.status}
            </StatusPill>
            <span className="text-xs tabular-nums text-muted-foreground w-20 text-right">
              {relativeAge(r.statusLastModified)}
            </span>
            <Button size="sm" onClick={() => setWizardBerthId(r.id)} className="gap-1">
              Catch up
              <ArrowRight className="size-3.5" aria-hidden />
            </Button>
          </li>
        ))}
      </ul>
      <CatchUpWizard
        berthId={wizardBerthId}
        open={!!wizardBerthId}
        onOpenChange={(o) => !o && setWizardBerthId(null)}
      />
    </>
  );
}