'use client';

import Link from 'next/link';
import { useQuery } from '@tanstack/react-query';
import { Loader2, Star } from 'lucide-react';

import { Popover, PopoverContent, PopoverTrigger } from '@/components/ui/popover';
import { apiFetch } from '@/lib/api/client';
import { stageBadgeClass, stageLabel } from '@/lib/constants';

interface ActiveInterestRow {
  interestId: string;
  clientName: string;
  pipelineStage: string;
  isPrimary: boolean;
  isInEoiBundle: boolean;
}

interface Props {
  berthId: string;
  portSlug: string;
  count: number;
}

/**
 * Click-to-expand popover for the berth-list "Active interests" cell.
 * Lazy-loads the linked-interest list when the rep opens it; cached
 * for 30s. Each row links to the interest detail page and shows the
 * pipeline-stage chip + the primary/EOI-bundle flags so the rep can
 * judge urgency without leaving the berth list.
 */
export function ActiveInterestsPopover({ berthId, portSlug, count }: Props) {
  // Lazy-load: only fetch when the popover opens. Pattern from the
  // detail-label fallback queries elsewhere in the codebase — the
  // `enabled` flag flips on first open.
  const { data, isLoading, isError } = useQuery<{ data: ActiveInterestRow[] }>({
    queryKey: ['berth', berthId, 'active-interests'],
    queryFn: () =>
      apiFetch<{ data: ActiveInterestRow[] }>(`/api/v1/berths/${berthId}/active-interests`),
    staleTime: 30_000,
    // The popover only renders when the trigger is clicked, so the
    // enabled gate falls out naturally from React Query's behaviour
    // inside the conditionally-rendered PopoverContent.
  });

  if (count === 0) return <span className="text-muted-foreground"> - </span>;

  return (
    <Popover>
      <PopoverTrigger asChild>
        <button
          type="button"
          className="inline-flex items-center gap-1 rounded-sm px-1 font-medium tabular-nums hover:bg-muted/60 focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-brand/40"
          aria-label={`Show ${count} active ${count === 1 ? 'interest' : 'interests'}`}
        >
          {count}
        </button>
      </PopoverTrigger>
      <PopoverContent side="right" align="start" className="w-72 p-2">
        <div className="mb-1 px-1 text-xs font-semibold text-muted-foreground uppercase tracking-wide">
          Active interests
        </div>
        {isLoading ? (
          <div className="flex items-center gap-2 px-2 py-3 text-sm text-muted-foreground">
            <Loader2 className="h-3.5 w-3.5 animate-spin" aria-hidden />
            Loading…
          </div>
        ) : isError ? (
          <div className="px-2 py-3 text-sm text-destructive">Failed to load interests.</div>
        ) : (data?.data ?? []).length === 0 ? (
          <div className="px-2 py-3 text-sm text-muted-foreground">No active interests.</div>
        ) : (
          <ul className="divide-y">
            {(data?.data ?? []).map((row) => (
              <li key={row.interestId} className="px-1 py-1.5">
                <Link
                  href={`/${portSlug}/interests/${row.interestId}`}
                  className="flex items-center justify-between gap-2 rounded-sm px-1 py-0.5 text-sm hover:bg-muted/60"
                >
                  <span className="flex min-w-0 items-center gap-1 truncate">
                    {row.isPrimary ? (
                      <Star className="h-3 w-3 shrink-0 text-amber-500" aria-hidden />
                    ) : null}
                    <span className="truncate">{row.clientName}</span>
                  </span>
                  <span
                    className={`shrink-0 inline-flex items-center rounded-full px-2 py-0.5 text-[10px] font-medium ${stageBadgeClass(
                      row.pipelineStage,
                    )}`}
                  >
                    {stageLabel(row.pipelineStage)}
                  </span>
                </Link>
              </li>
            ))}
          </ul>
        )}
      </PopoverContent>
    </Popover>
  );
}