import { ReactNode, useState, useEffect, useRef } from 'react';
import { Link, useLocation } from '@remix-run/react';
import { useFocusTrap } from '~/hooks/useFocusTrap';
import { designTokens } from '~/lib/design-tokens';

interface SidebarProps {
  isCollapsed: boolean;
  onToggle: () => void;
  isMobile: boolean;
  isOpen: boolean;
  onClose: () => void;
  userAuthLevel: number;
}

interface NavigationItem {
  name: string;
  href: string;
  icon: ReactNode;
  authLevel?: number; // Minimum auth level required
}

const navigationItems: NavigationItem[] = [
  {
    name: 'لوحة التحكم',
    href: '/dashboard',
    icon: (
      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M3 7v10a2 2 0 002 2h14a2 2 0 002-2V9a2 2 0 00-2-2H5a2 2 0 00-2-2z" />
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M8 5a2 2 0 012-2h4a2 2 0 012 2v6H8V5z" />
      </svg>
    ),
  },
  {
    name: 'العملاء',
    href: '/customers',
    icon: (
      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4.354a4 4 0 110 5.292M15 21H3v-1a6 6 0 0112 0v1zm0 0h6v-1a6 6 0 00-9-5.197m13.5-9a2.5 2.5 0 11-5 0 2.5 2.5 0 015 0z" />
      </svg>
    ),
  },
  {
    name: 'المركبات',
    href: '/vehicles',
    icon: (
      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 17a2 2 0 11-4 0 2 2 0 014 0zM19 17a2 2 0 11-4 0 2 2 0 014 0z" />
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 16V6a1 1 0 00-1-1H4a1 1 0 00-1 1v10a1 1 0 001 1h1m8-1a1 1 0 01-1-1V8a1 1 0 011-1h2.586a1 1 0 01.707.293l3.414 3.414a1 1 0 01.293.707V16a1 1 0 01-1 1h-1m-6 0a1 1 0 001 1h4a1 1 0 001-1m-6 0V9a1 1 0 00-1-1v0a1 1 0 00-1 1v8a1 1 0 001 1z" />
      </svg>
    ),
  },
  {
    name: 'زيارات الصيانة',
    href: '/maintenance-visits',
    icon: (
      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.065 2.572c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.572 1.065c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.065-2.572c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z" />
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
      </svg>
    ),
  },
  {
    name: 'المصروفات',
    href: '/expenses',
    icon: (
      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M17 9V7a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2m2 4h10a2 2 0 002-2v-6a2 2 0 00-2-2H9a2 2 0 00-2 2v6a2 2 0 002 2zm7-5a2 2 0 11-4 0 2 2 0 014 0z" />
      </svg>
    ),
    authLevel: 2, // Admin and above
  },
  {
    name: 'التقارير المالية',
    href: '/financial-reports',
    icon: (
      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z" />
      </svg>
    ),
    authLevel: 2, // Admin and above
  },
  {
    name: 'إدارة المستخدمين',
    href: '/users',
    icon: (
      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M12 4.354a4 4 0 110 5.292M15 21H3v-1a6 6 0 0112 0v1zm0 0h6v-1a6 6 0 00-9-5.197m13.5-9a2.5 2.5 0 11-5 0 2.5 2.5 0 015 0z" />
      </svg>
    ),
    authLevel: 2, // Admin and above
  },
  {
    name: 'إعدادات النظام',
    href: '/settings',
    icon: (
      <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.065 2.572c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.572 1.065c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.065-2.572c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z" />
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
      </svg>
    ),
    authLevel: 2, // Admin and above
  },
];

export function Sidebar({ isCollapsed, onToggle, isMobile, isOpen, onClose, userAuthLevel }: SidebarProps) {
  const location = useLocation();
  const sidebarRef = useRef<HTMLElement>(null);
  const [announcement, setAnnouncement] = useState('');
  const [isClient, setIsClient] = useState(false);

  // Set client-side flag
  useEffect(() => {
    setIsClient(true);
  }, []);

  // Filter navigation items based on user auth level
  const filteredNavItems = navigationItems.filter(item => 
    !item.authLevel || userAuthLevel <= item.authLevel
  );

  // Enable focus trap for mobile menu when open
  useFocusTrap(sidebarRef, isOpen && isClient);

  // Close sidebar on route change
  useEffect(() => {
    if (isOpen) {
      onClose();
    }
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [location.pathname]);

  // Handle Escape key to close mobile menu
  useEffect(() => {
    if (!isClient) return;

    const handleEscape = (e: KeyboardEvent) => {
      if (e.key === 'Escape' && isOpen) {
        onClose();
        setAnnouncement('القائمة مغلقة');
      }
    };

    document.addEventListener('keydown', handleEscape);
    return () => document.removeEventListener('keydown', handleEscape);
  }, [isOpen, onClose, isClient]);

  // Announce menu state changes for screen readers
  useEffect(() => {
    if (isOpen && isClient) {
      setAnnouncement('القائمة مفتوحة');
    }
  }, [isOpen, isClient]);

  // Render both mobile and desktop sidebars, use CSS to show/hide
  return (
    <>
      {/* Screen reader announcement */}
      <div
        role="status"
        aria-live="polite"
        aria-atomic="true"
        className="sr-only"
      >
        {announcement}
      </div>

      {/* Mobile overlay - only show on mobile/tablet */}
      {isOpen && (
        <div 
          className="fixed inset-0 bg-black/50 backdrop-blur-sm transition-opacity duration-300 md:hidden"
          style={{ zIndex: designTokens.zIndex.overlay }}
          onClick={onClose}
          aria-hidden="true"
        />
      )}

      {/* Mobile Sidebar - hidden on desktop (md+) */}
      <aside
        ref={sidebarRef}
        className={`
          md:hidden
          fixed top-0 right-0 h-full w-80 max-w-[85vw] bg-white shadow-2xl
          transform transition-transform duration-300 ease-out
          ${isOpen ? 'translate-x-0' : 'translate-x-full'}
        `}
        style={{ zIndex: designTokens.zIndex.sidebar }}
        dir="rtl"
        role="navigation"
        aria-label="القائمة الرئيسية"
        aria-hidden={!isOpen}
      >
        {/* Mobile Header */}
        <div className="flex items-center justify-between h-16 px-4 border-b border-gray-200 bg-white">
          <div className="flex items-center gap-3">
            <div className="h-10 w-10 bg-blue-600 rounded-lg flex items-center justify-center flex-shrink-0">
              <svg className="h-6 w-6 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24" aria-hidden="true">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 10V3L4 14h7v7l9-11h-7z" />
              </svg>
            </div>
            <h1 className="text-lg font-bold text-gray-900">نظام الصيانة</h1>
          </div>
          <button
            onClick={onClose}
            className="p-2 rounded-lg text-gray-400 hover:text-gray-600 hover:bg-gray-100 focus:outline-none focus:ring-2 focus:ring-blue-500 transition-colors"
            aria-label="إغلاق القائمة"
          >
            <svg className="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24" aria-hidden="true">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
            </svg>
          </button>
        </div>

        {/* Mobile Navigation */}
        <nav className="flex-1 overflow-y-auto px-3 py-4" aria-label="القائمة الرئيسية">
          <ul className="space-y-1" role="list">
            {filteredNavItems.map((item) => {
              const isActive = location.pathname === item.href;
              return (
                <li key={item.name}>
                  <Link
                    to={item.href}
                    className={`
                      group flex items-center gap-3 px-3 py-3 text-sm font-medium rounded-lg transition-all duration-150 relative
                      ${isActive 
                        ? 'bg-blue-50 text-blue-900 shadow-sm' 
                        : 'text-gray-700 hover:bg-gray-50 hover:text-gray-900'
                      }
                    `}
                    aria-current={isActive ? 'page' : undefined}
                  >
                    {isActive && (
                      <div className="absolute right-0 top-0 bottom-0 w-1 bg-blue-600 rounded-l-md" aria-hidden="true"></div>
                    )}
                    <div className={`flex-shrink-0 ${isActive ? 'text-blue-600' : 'text-gray-400 group-hover:text-gray-600'}`}>
                      {item.icon}
                    </div>
                    <span className="flex-1">{item.name}</span>
                  </Link>
                </li>
              );
            })}
          </ul>
        </nav>

        {/* Mobile Footer */}
        <div className="border-t border-gray-200 p-4 bg-gray-50">
          <p className="text-xs text-gray-500 text-center">
            نظام إدارة صيانة السيارات
          </p>
        </div>
      </aside>

      {/* Desktop Sidebar - hidden on mobile/tablet (< md) */}
      <aside
        className={`
          hidden md:block
          fixed top-0 right-0 h-full bg-white shadow-lg
          transition-all duration-300 ease-out
          ${isCollapsed ? 'w-16' : 'w-64'}
        `}
        style={{ zIndex: designTokens.zIndex.sidebar }}
        dir="rtl"
        role="navigation"
        aria-label="القائمة الرئيسية"
      >
      {/* Desktop Header */}
      <div className="flex items-center justify-between h-16 px-4 border-b border-gray-200 bg-white">
        <div className="flex items-center flex-1 min-w-0">
          <div className="h-10 w-10 bg-blue-600 rounded-lg flex items-center justify-center flex-shrink-0">
            <svg className="h-6 w-6 text-white" fill="none" stroke="currentColor" viewBox="0 0 24 24" aria-hidden="true">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M13 10V3L4 14h7v7l9-11h-7z" />
            </svg>
          </div>
          {!isCollapsed && (
            <h1 className="mr-3 text-lg font-bold text-gray-900 truncate">نظام الصيانة</h1>
          )}
        </div>
        
        <button
          onClick={() => {
            onToggle();
            setAnnouncement(isCollapsed ? 'القائمة موسعة' : 'القائمة مطوية');
          }}
          className="p-2 rounded-lg text-gray-400 hover:text-gray-600 hover:bg-gray-100 focus:outline-none focus:ring-2 focus:ring-blue-500 transition-colors flex-shrink-0"
          aria-label={isCollapsed ? 'توسيع القائمة' : 'طي القائمة'}
          aria-expanded={!isCollapsed}
        >
          <svg
            className={`h-5 w-5 transform transition-transform duration-200 ${isCollapsed ? 'rotate-180' : ''}`}
            fill="none"
            stroke="currentColor"
            viewBox="0 0 24 24"
            aria-hidden="true"
          >
            <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M15 19l-7-7 7-7" />
          </svg>
        </button>
      </div>

      {/* Desktop Navigation */}
      <nav className="flex-1 overflow-y-auto px-2 py-4" aria-label="القائمة الرئيسية">
        <ul className="space-y-1" role="list">
          {filteredNavItems.map((item) => {
            const isActive = location.pathname === item.href;
            return (
              <li key={item.name}>
                <Link
                  to={item.href}
                  className={`
                    group flex items-center gap-3 px-3 py-3 text-sm font-medium rounded-lg transition-all duration-150 relative
                    ${isActive 
                      ? 'bg-blue-50 text-blue-900 shadow-sm' 
                      : 'text-gray-700 hover:bg-gray-50 hover:text-gray-900'
                    }
                    ${isCollapsed ? 'justify-center' : ''}
                  `}
                  title={isCollapsed ? item.name : undefined}
                  aria-label={isCollapsed ? item.name : undefined}
                  aria-current={isActive ? 'page' : undefined}
                >
                  {isActive && !isCollapsed && (
                    <div className="absolute right-0 top-0 bottom-0 w-1 bg-blue-600 rounded-l-md" aria-hidden="true"></div>
                  )}
                  <div className={`flex-shrink-0 ${isActive ? 'text-blue-600' : 'text-gray-400 group-hover:text-gray-600'}`}>
                    {item.icon}
                  </div>
                  {!isCollapsed && (
                    <span className="flex-1 truncate">{item.name}</span>
                  )}
                </Link>
              </li>
            );
          })}
        </ul>
      </nav>

      {/* Desktop Footer */}
      {!isCollapsed && (
        <div className="border-t border-gray-200 p-4 bg-gray-50">
          <p className="text-xs text-gray-500 text-center">
            نظام إدارة صيانة السيارات
          </p>
        </div>
      )}
    </aside>
    </>
  );
}