import * as React from 'react';
import { Slot } from '@radix-ui/react-slot';
import { ChevronRight, MoreHorizontal } from 'lucide-react';
import { cn } from '@/lib/utils';

/**
 * 标准 shadcn/ui Breadcrumb 组件
 * 纯 HTML 实现，不依赖 Radix
 */
function Breadcrumb({ className, ...props }: React.ComponentProps<'nav'>) {
  return <nav aria-label="breadcrumb" data-slot="breadcrumb" className={cn('', className)} {...props} />;
}

function BreadcrumbList({ className, ...props }: React.ComponentProps<'ol'>) {
  return (
    <ol
      data-slot="breadcrumb-list"
      className={cn(
        'flex flex-wrap items-center gap-1.5 break-words text-sm text-text-muted sm:gap-2.5',
        className
      )}
      {...props}
    />
  );
}

function BreadcrumbItem({ className, ...props }: React.ComponentProps<'li'>) {
  return (
    <li
      data-slot="breadcrumb-item"
      className={cn('inline-flex items-center gap-1.5', className)}
      {...props}
    />
  );
}

type BreadcrumbLinkProps = React.ComponentProps<'a'> & {
  asChild?: boolean;
};

function BreadcrumbLink({ asChild, className, ...props }: BreadcrumbLinkProps) {
  const Comp = asChild ? Slot : 'a';

  return (
    <Comp
      data-slot="breadcrumb-link"
      className={cn('transition-colors hover:text-text-primary', className)}
      {...props}
    />
  );
}

function BreadcrumbPage({ className, ...props }: React.ComponentProps<'span'>) {
  return (
    <span
      data-slot="breadcrumb-page"
      role="link"
      aria-disabled="true"
      aria-current="page"
      className={cn('font-normal text-text-primary', className)}
      {...props}
    />
  );
}

function BreadcrumbSeparator({
  children,
  className,
  ...props
}: React.ComponentProps<'li'>) {
  return (
    <li
      role="presentation"
      aria-hidden="true"
      data-slot="breadcrumb-separator"
      className={cn('[&>svg]:size-3.5 text-text-subtle', className)}
      {...props}
    >
      {children ?? <ChevronRight />}
    </li>
  );
}

function BreadcrumbEllipsis({ className, ...props }: React.ComponentProps<'span'>) {
  return (
    <span
      role="presentation"
      aria-hidden="true"
      data-slot="breadcrumb-ellipsis"
      className={cn('flex size-9 items-center justify-center', className)}
      {...props}
    >
      <MoreHorizontal className="size-4" />
      <span className="sr-only">更多</span>
    </span>
  );
}

export {
  Breadcrumb,
  BreadcrumbList,
  BreadcrumbItem,
  BreadcrumbLink,
  BreadcrumbPage,
  BreadcrumbSeparator,
  BreadcrumbEllipsis,
};