'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { Fragment } from 'react';
import { ChevronRight } from 'lucide-react';

import {
  Breadcrumb,
  BreadcrumbItem,
  BreadcrumbLink,
  BreadcrumbList,
  BreadcrumbPage,
  BreadcrumbSeparator,
} from '@/components/ui/breadcrumb';
import { usePortContext } from '@/providers/port-provider';

// Human-readable labels for route segments
const SEGMENT_LABELS: Record<string, string> = {
  dashboard: 'Dashboard',
  clients: 'Clients',
  interests: 'Interests',
  berths: 'Berths',
  documents: 'Documents',
  files: 'Files',
  expenses: 'Expenses',
  invoices: 'Invoices',
  email: 'Email',
  reminders: 'Reminders',
  settings: 'Settings',
  admin: 'Administration',
  reports: 'Reports',
  new: 'New',
  edit: 'Edit',
  profile: 'Profile',
};

// UUID v4-ish (or any 36-char hex+dash) — used to skip entity-id segments
// from the breadcrumbs since the page H1 already shows the entity name.
const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

function isIdSegment(segment: string): boolean {
  return UUID_RE.test(segment);
}

function formatSegment(segment: string): string {
  return (
    SEGMENT_LABELS[segment] ?? segment.replace(/-/g, ' ').replace(/\b\w/g, (c) => c.toUpperCase())
  );
}

export function Breadcrumbs() {
  const pathname = usePathname();
  const { currentPort, currentPortSlug } = usePortContext();

  // Split pathname and filter empty segments
  const rawSegments = pathname.split('/').filter(Boolean);

  // Remove the portSlug segment and any UUID-ish entity-id segments — the
  // page H1 already shows the entity name, no need to leak the raw id.
  const segments = (
    currentPortSlug ? rawSegments.filter((seg) => seg !== currentPortSlug) : rawSegments
  ).filter((seg) => !isIdSegment(seg));

  if (segments.length === 0) {
    return (
      <Breadcrumb>
        <BreadcrumbList>
          <BreadcrumbItem>
            <BreadcrumbPage className="text-foreground font-medium">
              {currentPort?.name ?? 'Port Nimara CRM'}
            </BreadcrumbPage>
          </BreadcrumbItem>
        </BreadcrumbList>
      </Breadcrumb>
    );
  }

  // Build href for each segment
  const crumbs = segments.map((segment, index) => {
    const segmentsUpToHere = rawSegments.slice(0, rawSegments.indexOf(segment, index) + 1);
    const href = '/' + segmentsUpToHere.join('/');
    const label = formatSegment(segment);
    const isLast = index === segments.length - 1;

    return { label, href, isLast };
  });

  return (
    <Breadcrumb>
      <BreadcrumbList>
        {currentPort && (
          <>
            <BreadcrumbItem>
              <BreadcrumbLink asChild>
                <Link
                  // eslint-disable-next-line @typescript-eslint/no-explicit-any
                  href={`/${currentPortSlug}/dashboard` as any}
                  className="text-muted-foreground hover:text-foreground transition-colors"
                >
                  {currentPort.name}
                </Link>
              </BreadcrumbLink>
            </BreadcrumbItem>
            {crumbs.length > 0 && (
              <BreadcrumbSeparator>
                <ChevronRight className="w-3 h-3" />
              </BreadcrumbSeparator>
            )}
          </>
        )}

        {crumbs.map((crumb, _index) => (
          <Fragment key={crumb.href}>
            <BreadcrumbItem>
              {crumb.isLast ? (
                <BreadcrumbPage className="font-medium text-foreground">
                  {crumb.label}
                </BreadcrumbPage>
              ) : (
                <BreadcrumbLink asChild>
                  <Link
                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
                    href={crumb.href as any}
                    className="text-muted-foreground hover:text-foreground transition-colors"
                  >
                    {crumb.label}
                  </Link>
                </BreadcrumbLink>
              )}
            </BreadcrumbItem>
            {!crumb.isLast && (
              <BreadcrumbSeparator>
                <ChevronRight className="w-3 h-3" />
              </BreadcrumbSeparator>
            )}
          </Fragment>
        ))}
      </BreadcrumbList>
    </Breadcrumb>
  );
}