'use client';

import Link from 'next/link';
import { usePathname } from 'next/navigation';
import { useAuthStore } from '@/stores/auth.store';

interface NavItem {
  label: string;
  href: string;
  icon: React.ReactNode;
  /** Module name for access check — if set, item only shows when user canView this module */
  module?: string;
  /** Fallback: legacy role check (used if module not set) */
  roles?: string[];
}

/* SVG icons — no emojis */
const icons = {
  dashboard: (
    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round">
      <rect x="1" y="1" width="7" height="7" rx="1.5" /><rect x="10" y="1" width="7" height="4" rx="1.5" /><rect x="1" y="10" width="7" height="4" rx="1.5" /><rect x="10" y="7" width="7" height="7" rx="1.5" />
    </svg>
  ),
  clients: (
    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round">
      <circle cx="9" cy="5.5" r="3" /><path d="M2 16.5c0-3.314 3.134-6 7-6s7 2.686 7 6" />
    </svg>
  ),
  subscriptions: (
    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round">
      <path d="M3 6h12M3 10h12M3 14h8" />
    </svg>
  ),
  tickets: (
    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round">
      <rect x="2" y="3" width="14" height="12" rx="2" /><path d="M6 3v12M2 9h4M12 9h4" />
    </svg>
  ),
  invoices: (
    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round">
      <path d="M4 2h10a1 1 0 011 1v12a1 1 0 01-1 1H4a1 1 0 01-1-1V3a1 1 0 011-1z" /><path d="M6 6h6M6 9h6M6 12h3" />
    </svg>
  ),
  payments: (
    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round">
      <circle cx="9" cy="9" r="7" /><path d="M9 5v8M7 7h3.5a1.5 1.5 0 010 3H7h4a1.5 1.5 0 010 3H7" />
    </svg>
  ),
  areas: (
    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round">
      <path d="M9 16s-6-4.35-6-8.5a6 6 0 0112 0C15 11.65 9 16 9 16z" /><circle cx="9" cy="7.5" r="2" />
    </svg>
  ),
  plans: (
    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round">
      <rect x="2" y="2" width="14" height="14" rx="2" /><path d="M6 6h6v6H6z" />
    </svg>
  ),
  users: (
    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round">
      <circle cx="6.5" cy="5" r="2.5" /><circle cx="12.5" cy="5" r="2.5" /><path d="M1 15c0-2.761 2.462-5 5.5-5s5.5 2.239 5.5 5M10 15c0-2.761 1.12-5 2.5-5s2.5 2.239 2.5 5" />
    </svg>
  ),
  settings: (
    <svg width="18" height="18" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round">
      <circle cx="9" cy="9" r="2.5" /><path d="M14.7 11.1a1.2 1.2 0 00.24 1.32l.04.04a1.45 1.45 0 11-2.05 2.05l-.04-.04a1.2 1.2 0 00-1.32-.24 1.2 1.2 0 00-.73 1.1v.12a1.45 1.45 0 01-2.9 0v-.06a1.2 1.2 0 00-.79-1.1 1.2 1.2 0 00-1.32.24l-.04.04a1.45 1.45 0 11-2.05-2.05l.04-.04a1.2 1.2 0 00.24-1.32 1.2 1.2 0 00-1.1-.73h-.12a1.45 1.45 0 010-2.9h.06a1.2 1.2 0 001.1-.79 1.2 1.2 0 00-.24-1.32l-.04-.04a1.45 1.45 0 112.05-2.05l.04.04a1.2 1.2 0 001.32.24h.06a1.2 1.2 0 00.73-1.1v-.12a1.45 1.45 0 012.9 0v.06a1.2 1.2 0 00.73 1.1 1.2 1.2 0 001.32-.24l.04-.04a1.45 1.45 0 112.05 2.05l-.04.04a1.2 1.2 0 00-.24 1.32v.06a1.2 1.2 0 001.1.73h.12a1.45 1.45 0 010 2.9h-.06a1.2 1.2 0 00-1.1.73z" />
    </svg>
  ),
};

const NAV_ITEMS: NavItem[] = [
  { label: 'Dashboard', href: '/dashboard', icon: icons.dashboard, module: 'dashboard' },
  { label: 'Clients', href: '/dashboard/clients', icon: icons.clients, module: 'clients' },
  { label: 'Tickets', href: '/dashboard/tickets', icon: icons.tickets, module: 'tickets' },
  { label: 'Invoices', href: '/dashboard/invoices', icon: icons.invoices, module: 'invoices' },
  { label: 'Payments', href: '/dashboard/payments', icon: icons.payments, module: 'payments' },
  { label: 'Employees', href: '/dashboard/employees', icon: icons.users, module: 'employees' },
  { label: 'Payroll', href: '/dashboard/payroll', icon: icons.payments, module: 'payroll' },
  { label: 'Expenses', href: '/dashboard/expenses', icon: icons.payments, module: 'expenses' },
  { label: 'Assets', href: '/dashboard/assets', icon: icons.plans, module: 'assets' },
  { label: 'Fund Transfers', href: '/dashboard/accounts', icon: icons.invoices, module: 'fund_transfers' },
  { label: 'Accounting', href: '/dashboard/accounting', icon: icons.subscriptions, module: 'accounting' },
  { label: 'Reports', href: '/dashboard/reports', icon: icons.invoices, module: 'reports' },
  { label: 'Settings', href: '/dashboard/settings', icon: icons.settings, module: 'settings' },
];

export function Sidebar() {
  const pathname = usePathname();
  const user = useAuthStore((s) => s.user);
  const canView = useAuthStore((s) => s.canView);
  const isSuperAdmin = useAuthStore((s) => s.isSuperAdmin);

  const visibleItems = NAV_ITEMS.filter((item) => {
    // Super admin sees everything
    if (isSuperAdmin()) return true;
    // Check module-level access
    if (item.module) return canView(item.module);
    return true;
  });

  return (
    <aside className="w-60 bg-white dark:bg-surface-900 border-r border-surface-200/80 dark:border-surface-700/80 flex flex-col overflow-y-auto">
      {/* Logo */}
      <div className="px-5 py-5 border-b border-surface-100 dark:border-surface-700">
        <div className="flex items-center gap-2.5">
          <svg width="28" height="28" viewBox="0 0 40 40" fill="none" className="text-primary-600 dark:text-primary-400">
            <rect width="40" height="40" rx="10" fill="currentColor" fillOpacity="0.1" />
            <path d="M12 20h16M20 12v16" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" />
          </svg>
          <div>
            <span className="text-base font-bold text-surface-900 dark:text-surface-100 tracking-tight">FiberOps</span>
            {user?.tenant && (
              <p className="text-[11px] text-surface-400 leading-none mt-0.5">{user.tenant.name}</p>
            )}
          </div>
        </div>
      </div>

      {/* Nav */}
      <nav aria-label="Main navigation" className="flex-1 px-3 py-4 space-y-0.5">
        {visibleItems.map((item) => {
          const isActive = pathname === item.href || (item.href !== '/dashboard' && pathname.startsWith(item.href));
          return (
            <Link
              key={item.href}
              href={item.href}
              aria-current={isActive ? 'page' : undefined}
              className={`flex items-center gap-3 px-3 py-2 rounded-lg text-[13px] font-medium transition-all duration-200 cursor-pointer ${
                isActive
                  ? 'bg-primary-50 dark:bg-primary-900/40 text-primary-700 dark:text-primary-300 shadow-sm shadow-primary-100 dark:shadow-primary-900/30'
                  : 'text-surface-500 dark:text-surface-400 hover:bg-surface-50 dark:hover:bg-surface-700 hover:text-surface-800 dark:hover:text-surface-200'
              }`}
            >
              <span aria-hidden="true" className={isActive ? 'text-primary-600 dark:text-primary-400' : 'text-surface-400 dark:text-surface-500'}>{item.icon}</span>
              {item.label}
            </Link>
          );
        })}
      </nav>

      {/* User */}
      <div className="px-4 py-4 border-t border-surface-100 dark:border-surface-700">
        <div className="flex items-center gap-3">
          <div className="w-8 h-8 rounded-full bg-primary-100 dark:bg-primary-900/50 flex items-center justify-center text-primary-700 dark:text-primary-300 text-xs font-bold">
            {user?.firstName?.[0]}{user?.lastName?.[0]}
          </div>
          <div className="min-w-0 flex-1">
            <p className="text-sm font-medium text-surface-800 dark:text-surface-200 truncate">
              {user?.firstName} {user?.lastName}
            </p>
            <p className="text-[11px] text-surface-400 truncate">
              {user?.tenantRoles?.map((r) => r.name).join(', ') || user?.roles?.join(', ') || ''}
            </p>
          </div>
        </div>
      </div>
    </aside>
  );
}