/**
 * Admin Sidebar Navigation
 * Displays navigation links for admin section
 */

'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { cn } from '@/lib/utils';
import {
  LayoutDashboard,
  Users,
  Building2,
  Settings,
  ChevronLeft,
  ChevronRight,
} from 'lucide-react';
import { useState } from 'react';
import { useAuth } from '@/lib/auth/AuthContext';

interface NavItem {
  name: string;
  href: string;
  icon: React.ComponentType<{ className?: string }>;
}

const navItems: NavItem[] = [
  {
    name: 'Dashboard',
    href: '/admin',
    icon: LayoutDashboard,
  },
  {
    name: 'Users',
    href: '/admin/users',
    icon: Users,
  },
  {
    name: 'Organizations',
    href: '/admin/organizations',
    icon: Building2,
  },
  {
    name: 'Settings',
    href: '/admin/settings',
    icon: Settings,
  },
];

export function AdminSidebar() {
  const pathname = usePathname();
  const { user } = useAuth();
  const [collapsed, setCollapsed] = useState(false);

  return (
    <aside
      className={cn(
        'border-r bg-muted/40 transition-all duration-300',
        collapsed ? 'w-16' : 'w-64'
      )}
      data-testid="admin-sidebar"
    >
      <div className="flex h-full flex-col">
        {/* Sidebar Header */}
        <div className="flex h-16 items-center justify-between border-b px-4">
          {!collapsed && <h2 className="text-lg font-semibold">Admin Panel</h2>}
          <button
            onClick={() => setCollapsed(!collapsed)}
            className="rounded-md p-2 hover:bg-accent focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2"
            aria-label={collapsed ? 'Expand sidebar' : 'Collapse sidebar'}
            data-testid="sidebar-toggle"
          >
            {collapsed ? (
              <ChevronRight className="h-4 w-4" aria-hidden="true" />
            ) : (
              <ChevronLeft className="h-4 w-4" aria-hidden="true" />
            )}
          </button>
        </div>

        {/* Navigation Links */}
        <nav className="flex-1 space-y-1 p-2">
          {navItems.map((item) => {
            const isActive =
              pathname === item.href || (item.href !== '/admin' && pathname.startsWith(item.href));
            const Icon = item.icon;

            return (
              <Link
                key={item.href}
                href={item.href}
                className={cn(
                  'flex items-center gap-3 rounded-md px-3 py-2 text-sm font-medium transition-colors',
                  'hover:bg-accent hover:text-accent-foreground',
                  'focus-visible:outline-none focus-visible:ring-2 focus-visible:ring-ring focus-visible:ring-offset-2',
                  isActive ? 'bg-accent text-accent-foreground' : 'text-muted-foreground',
                  collapsed && 'justify-center'
                )}
                title={collapsed ? item.name : undefined}
                data-testid={`nav-${item.name.toLowerCase()}`}
              >
                <Icon className="h-5 w-5 flex-shrink-0" aria-hidden="true" />
                {!collapsed && <span>{item.name}</span>}
              </Link>
            );
          })}
        </nav>

        {/* User Info */}
        {!collapsed && user && (
          <div className="border-t p-4">
            <div className="flex items-center gap-3">
              <div className="flex h-8 w-8 items-center justify-center rounded-full bg-primary text-primary-foreground text-sm font-medium">
                {user.first_name?.[0] || user.email[0].toUpperCase()}
              </div>
              <div className="flex-1 overflow-hidden">
                <p className="text-sm font-medium truncate">
                  {user.first_name} {user.last_name}
                </p>
                <p className="text-xs text-muted-foreground truncate">{user.email}</p>
              </div>
            </div>
          </div>
        )}
      </div>
    </aside>
  );
}