import React, { useId } from 'react';
import Link from 'next/link';
import { Icon } from '@iconify/react';
import { cn, findMenuPath } from '@/lib/helper';
import { Size } from '@/types/theme';
import Button from '@/components/Button';
import { MAIN_DRAWER_LINKS } from '@/config/constant';

interface BreadcrumbItem {
  label: string;
  href?: string;
  icon?: React.ReactNode;
  isActive?: boolean;
  isDisabled?: boolean;
}

interface BreadcrumbsProps extends React.HTMLAttributes<HTMLElement> {
  items: BreadcrumbItem[];
  size?: Size;
  maxVisibleItems?: number;
  showEllipsisDropdown?: boolean;
}

export function buildBreadcrumbs(pathname: string): BreadcrumbItem[] {
  const menuPath = findMenuPath(MAIN_DRAWER_LINKS, pathname);

  if (!menuPath) return [];

  return menuPath.map((menu, index) => {
    const isLast = index === menuPath.length - 1;

    return {
      label: menu.text,
      href: isLast ? menu.link : undefined,
      isActive: isLast,
      icon: menu.icon ? (
        <Icon icon={menu.icon} width={16} height={16} />
      ) : undefined,
    };
  });
}

const EllipsisDropdown = ({
  hiddenItems,
}: {
  hiddenItems: BreadcrumbItem[];
}) => {
  const dropdownId = useId();
  const anchorId = useId();

  return (
    <li>
      {/* Ellipsis Button */}
      <Button
        popoverTarget={dropdownId}
        variant='ghost'
        color='none'
        style={
          {
            anchorName: `--breadcrumb-ellipsis-anchor-${anchorId}`,
          } as React.CSSProperties
        }
      >
        <Icon icon='material-symbols:more-horiz' width={16} height={16} />
      </Button>

      {/* Dropdown Menu using popover API */}
      <ul
        className='dropdown menu rounded-box bg-base-100 border border-base-300 shadow-lg z-[9999] [&_a:hover]:no-underline [&_a:focus]:no-underline [&&]:no-underline [&&_a]:no-underline [&&]:hover:no-underline [&&]:flex [&&]:items-start [&&]:justify-start w-max'
        popover='auto'
        id={dropdownId}
        style={
          {
            positionAnchor: `--breadcrumb-ellipsis-anchor-${anchorId}`,
          } as React.CSSProperties
        }
      >
        {hiddenItems.map((item, index) => {
          const itemStyles = cn(
            '[&]:flex [&]:items-center [&]:justify-start py-1 text-sm',
            // Disabled state
            item.isDisabled && 'text-base-content/40 opacity-50',
            // Active/Last state
            (item.isActive || item.isDisabled) && 'text-primary',
            // Regular clickable state
            !item.isDisabled && 'text-base-content/50'
          );

          const itemContent = (
            <div className={itemStyles}>
              {item.icon && (
                <span className='inline-flex mr-2'>{item.icon}</span>
              )}
              {item.label}
            </div>
          );

          return (
            <li
              key={`ellipsis-${index}`}
              className='[&&]:text-left [&&]:block w-full'
            >
              {item.href && !item.isDisabled ? (
                <Link
                  href={item.href}
                  className='block !no-underline [&&]:text-left w-full'
                  onClick={(e) => e.stopPropagation()}
                >
                  {itemContent}
                </Link>
              ) : (
                <div className='block !no-underline [&&]:cursor-default [&&]:hover:cursor-default [&&]:hover:bg-base-100 [&&]:text-left'>
                  {itemContent}
                </div>
              )}
            </li>
          );
        })}
      </ul>
    </li>
  );
};

const Breadcrumb = ({
  items,
  size = 'md',
  maxVisibleItems = 3,
  showEllipsisDropdown = true,
  className,
  ...props
}: BreadcrumbsProps) => {
  const sizeClasses = {
    xs: 'text-xs',
    sm: 'text-sm',
    md: 'text-base',
    lg: 'text-lg',
    xl: 'text-xl',
  };

  const getItemStyles = (
    item: BreadcrumbItem,
    position: 'first' | 'middle' | 'last' = 'middle'
  ) => {
    const baseClasses = 'inline-flex items-center gap-2';

    // Disabled state
    if (item.isDisabled) {
      return `${baseClasses} text-base-content/40 !cursor-default opacity-50 hover:!no-underline`;
    }

    // Active/Last state (no underline)
    if (item.isActive || position === 'last') {
      return `${baseClasses} text-primary !cursor-pointer hover:!no-underline`;
    }

    // Regular clickable state
    return `${baseClasses} text-base-content/60`;
  };

  const renderItem = (
    item: BreadcrumbItem,
    position: 'first' | 'middle' | 'last' = 'middle'
  ) => {
    const styles = getItemStyles(item, position);

    // Disabled items
    if (item.isDisabled) {
      return (
        <span className={styles}>
          {item.icon && item.icon}
          {item.label}
        </span>
      );
    }

    // Active/Last items
    if (item.isActive || position === 'last') {
      if (item.href) {
        return (
          <Link href={item.href} className={styles}>
            {item.icon && (
              <span className='inline-flex gap-2'>{item.icon}</span>
            )}
            {item.label}
          </Link>
        );
      }
      return (
        <span className={styles}>
          {item.icon && item.icon}
          {item.label}
        </span>
      );
    }

    // Regular items
    if (item.href) {
      return (
        <Link href={item.href} className={styles}>
          {item.icon && <span className='inline-flex gap-2'>{item.icon}</span>}
          {item.label}
        </Link>
      );
    }

    return (
      <span className={styles}>
        {item.icon && item.icon}
        {item.label}
      </span>
    );
  };

  const renderBreadcrumbList = () => {
    // Show all items if within limit
    if (items.length <= maxVisibleItems) {
      return items.map((item, index) => {
        const position =
          index === 0
            ? 'first'
            : index === items.length - 1
              ? 'last'
              : 'middle';
        return <li key={index}>{renderItem(item, position)}</li>;
      });
    }

    // Collapsed items indexing when exceeding limit
    const firstItem = items[0];
    const lastItem = items[items.length - 1];
    const visibleMiddleItems = items.slice(1, -1).slice(-(maxVisibleItems - 2));
    const hiddenItems = items.slice(1, -1).slice(0, -(maxVisibleItems - 2));
    const showEllipsis = showEllipsisDropdown && hiddenItems.length > 0;

    return (
      <>
        <li>{renderItem(firstItem, 'first')}</li>

        {/* Ellipsis for hidden items with dropdown */}
        {showEllipsis && <EllipsisDropdown hiddenItems={hiddenItems} />}

        {/* Middle items */}
        {visibleMiddleItems.map((item, index) => (
          <li key={`middle-${index}`}>{renderItem(item, 'middle')}</li>
        ))}

        <li>{renderItem(lastItem, 'last')}</li>
      </>
    );
  };

  return (
    <nav
      aria-label='Breadcrumb'
      className={cn('breadcrumbs', sizeClasses[size], className)}
      {...props}
    >
      <ul className='text-sm'>{renderBreadcrumbList()}</ul>
    </nav>
  );
};

export default Breadcrumb;