'use client'

import Link from 'next/link'
import { usePathname } from 'next/navigation'
import { Fragment } from 'react'
import { BreadcrumbsSchema } from './breadcrumbs-schema'

interface BreadcrumbItem {
  label: string
  href: string
  current?: boolean
}

function HomeIcon({ className }: { className?: string }) {
  return (
    <svg
      className={className}
      fill="none"
      stroke="currentColor"
      viewBox="0 0 24 24"
      xmlns="http://www.w3.org/2000/svg"
    >
      <path
        strokeLinecap="round"
        strokeLinejoin="round"
        strokeWidth={2}
        d="M3 12l2-2m0 0l7-7 7 7M5 10v10a1 1 0 001 1h3m10-11l2 2m-2-2v10a1 1 0 01-1 1h-3m-6 0a1 1 0 001-1v-4a1 1 0 011-1h2a1 1 0 011 1v4a1 1 0 001 1m-6 0h6"
      />
    </svg>
  )
}

function ChevronIcon({ className }: { className?: string }) {
  return (
    <svg className={className} fill="none" stroke="currentColor" viewBox="0 0 24 24">
      <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 5l7 7-7 7" />
    </svg>
  )
}

function formatSegmentLabel(segment: string): string {
  const specialCases: { [key: string]: string } = {
    blog: 'Blog',
    tags: 'Tag-uri',
    about: 'Despre',
  }

  if (specialCases[segment]) {
    return specialCases[segment]
  }

  return segment
    .split('-')
    .map(word => word.charAt(0).toUpperCase() + word.slice(1))
    .join(' ')
}

export function Breadcrumbs({ items }: { items?: BreadcrumbItem[] }) {
  const pathname = usePathname()

  let breadcrumbs: BreadcrumbItem[] = items || []

  if (!items) {
    const segments = pathname.split('/').filter(Boolean)
    breadcrumbs = segments.map((segment, index) => {
      const href = '/' + segments.slice(0, index + 1).join('/')
      const label = formatSegmentLabel(segment)
      const current = index === segments.length - 1

      return { label, href, current }
    })
  }

  if (pathname === '/') {
    return null
  }

  const schemaItems = [
    { position: 1, name: 'Acasă', item: '/' },
    ...breadcrumbs.map((item, index) => ({
      position: index + 2,
      name: item.label,
      item: item.href,
    })),
  ]

  return (
    <>
      <nav
        aria-label="Breadcrumb"
        className="bg-gray-50 dark:bg-gray-800 border-b border-gray-200 dark:border-gray-700"
      >
        <div className="container mx-auto px-4 py-3">
          <ol className="flex items-center space-x-2 text-sm overflow-x-auto scrollbar-hide">
            <li className="flex-shrink-0">
              <Link
                href="/"
                className="flex items-center text-gray-500 hover:text-primary-600 transition"
                aria-label="Acasă"
              >
                <HomeIcon className="w-4 h-4" />
              </Link>
            </li>

            {breadcrumbs.map(item => (
              <Fragment key={item.href}>
                <li className="text-gray-400 flex-shrink-0">
                  <ChevronIcon className="w-4 h-4" />
                </li>
                <li className="flex-shrink-0">
                  {item.current ? (
                    <span
                      className="font-medium text-gray-700 dark:text-gray-300 truncate max-w-[150px] sm:max-w-none block"
                      aria-current="page"
                    >
                      {item.label}
                    </span>
                  ) : (
                    <Link
                      href={item.href}
                      className="text-gray-500 hover:text-primary-600 transition truncate max-w-[150px] sm:max-w-none block"
                    >
                      {item.label}
                    </Link>
                  )}
                </li>
              </Fragment>
            ))}
          </ol>
        </div>
      </nav>
      <BreadcrumbsSchema items={schemaItems} />
    </>
  )
}
