'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { useAuthStore } from '@/stores/authStore';

/**
 * Sidebar navigation items with icons
 */
const sidebarItems = [
  {
    href: '/dashboard',
    label: 'Dashboard',
    icon: (
      <svg className="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <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>
    ),
  },
  {
    href: '/beneficiaries',
    label: 'Loved Ones',
    icon: (
      <svg className="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M17 20h5v-2a3 3 0 00-5.356-1.857M17 20H7m10 0v-2c0-.656-.126-1.283-.356-1.857M7 20H2v-2a3 3 0 015.356-1.857M7 20v-2c0-.656.126-1.283.356-1.857m0 0a5.002 5.002 0 019.288 0M15 7a3 3 0 11-6 0 3 3 0 016 0zm6 3a2 2 0 11-4 0 2 2 0 014 0zM7 10a2 2 0 11-4 0 2 2 0 014 0z" />
      </svg>
    ),
  },
  {
    href: '/sensors',
    label: 'Sensors',
    icon: (
      <svg className="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
        <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M9 3v2m6-2v2M9 19v2m6-2v2M5 9H3m2 6H3m18-6h-2m2 6h-2M7 19h10a2 2 0 002-2V7a2 2 0 00-2-2H7a2 2 0 00-2 2v10a2 2 0 002 2zM9 9h6v6H9V9z" />
      </svg>
    ),
  },
  {
    href: '/settings',
    label: 'Settings',
    icon: (
      <svg className="h-5 w-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>
    ),
  },
];

/**
 * Sidebar Component
 *
 * Desktop-only sidebar navigation.
 * Hidden on mobile/tablet, shown on desktop (lg and above).
 *
 * Features:
 * - Active state highlighting
 * - Icon + label navigation
 * - User profile section at bottom
 * - Logout button
 *
 * @example
 * ```tsx
 * <Sidebar />
 * ```
 */
export function Sidebar() {
  const pathname = usePathname();
  const { user, logout } = useAuthStore();

  const userInitials = user?.firstName && user?.lastName
    ? `${user.firstName[0]}${user.lastName[0]}`.toUpperCase()
    : user?.email?.[0]?.toUpperCase() || '?';

  const userName = user?.firstName && user?.lastName
    ? `${user.firstName} ${user.lastName}`
    : user?.email || 'User';

  return (
    <aside className="hidden lg:fixed lg:inset-y-0 lg:flex lg:w-64 lg:flex-col">
      {/* Sidebar container */}
      <div className="flex min-h-0 flex-1 flex-col border-r border-slate-200 bg-white">
        {/* Logo section */}
        <div className="flex h-16 shrink-0 items-center gap-2 border-b border-slate-200 px-6">
          <div className="flex h-8 w-8 items-center justify-center rounded-lg bg-gradient-to-br from-blue-600 to-blue-500">
            <span className="text-lg font-bold text-white">W</span>
          </div>
          <span className="text-xl font-semibold text-slate-900">WellNuo</span>
        </div>

        {/* Navigation */}
        <nav className="flex-1 space-y-1 px-3 py-4">
          {sidebarItems.map((item) => {
            const isActive = pathname === item.href || pathname.startsWith(`${item.href}/`);
            return (
              <Link
                key={item.href}
                href={item.href}
                className={`group flex items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium transition-colors ${
                  isActive
                    ? 'bg-blue-50 text-blue-700'
                    : 'text-slate-700 hover:bg-slate-50 hover:text-slate-900'
                }`}
              >
                <span className={isActive ? 'text-blue-700' : 'text-slate-400 group-hover:text-slate-600'}>
                  {item.icon}
                </span>
                {item.label}
              </Link>
            );
          })}
        </nav>

        {/* User profile section at bottom */}
        <div className="border-t border-slate-200 p-4">
          <Link
            href="/profile"
            className="group flex items-center gap-3 rounded-lg px-3 py-2 transition-colors hover:bg-slate-50"
          >
            <div className="flex h-10 w-10 items-center justify-center rounded-full bg-blue-100 text-sm font-semibold text-blue-700">
              {userInitials}
            </div>
            <div className="flex-1 min-w-0">
              <div className="truncate text-sm font-medium text-slate-900">{userName}</div>
              {user?.email && (
                <div className="truncate text-xs text-slate-500">{user.email}</div>
              )}
            </div>
          </Link>

          {/* Logout button */}
          <button
            onClick={logout}
            className="mt-2 flex w-full items-center gap-3 rounded-lg px-3 py-2 text-sm font-medium text-slate-700 transition-colors hover:bg-red-50 hover:text-red-600"
          >
            <svg className="h-5 w-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M17 16l4-4m0 0l-4-4m4 4H7m6 4v1a3 3 0 01-3 3H6a3 3 0 01-3-3V7a3 3 0 013-3h4a3 3 0 013 3v1" />
            </svg>
            Sign Out
          </button>
        </div>
      </div>
    </aside>
  );
}