import { NavLink, Outlet } from 'react-router-dom'
import {
  LayoutDashboard, Upload, FileText, Search, List, AlertCircle,
  ShoppingCart, TrendingUp, BarChart2, PieChart, Activity, RefreshCw,
  Calendar, Users, Hotel, BookOpen, Wheat, ChefHat, UtensilsCrossed,
  Menu, ShieldCheck, Package, Settings, ChevronRight, TableProperties,
} from 'lucide-react'
import { useAuth } from './AuthGate'
import { can } from '../types'

const ICON = { size: 15, strokeWidth: 1.75 }

function SidebarSection({ label, children }: { label: string; children: React.ReactNode }) {
  return (
    <div className="sidebar-section">
      <div className="sidebar-section-label">{label}</div>
      {children}
    </div>
  )
}

function NavItem({ to, label, icon: Icon }: { to: string; label: string; icon: React.ComponentType<any> }) {
  return (
    <NavLink to={to} className={({ isActive }) => isActive ? 'active' : ''}>
      <Icon {...ICON} />
      {label}
    </NavLink>
  )
}

export default function Layout() {
  const { user } = useAuth()

  return (
    <div className="app-shell">
      <aside className="sidebar">
        <div className="sidebar-logo">
          <ChefHat size={18} strokeWidth={1.75} color="var(--app-primary)" />
          Kitchen
        </div>

        <nav className="sidebar-nav">
          <NavItem to="/dashboard" label="Dashboard" icon={LayoutDashboard} />

          {can(user, 'invoices') && (
            <SidebarSection label="Invoices">
              <NavItem to="/upload" label="Upload" icon={Upload} />
              <NavItem to="/invoices" label="Invoices" icon={FileText} />
              <NavItem to="/purchases-calendar" label="Purchases Chart" icon={TableProperties} />
              <NavItem to="/search/invoices" label="Search" icon={Search} />
              <NavItem to="/search/line-items" label="Line Items" icon={List} />
              {can(user, 'disputes') && <NavItem to="/disputes" label="Disputes" icon={AlertCircle} />}
              {can(user, 'orders') && <NavItem to="/purchase-orders" label="Purchase Orders" icon={ShoppingCart} />}
            </SidebarSection>
          )}

          {can(user, 'view') && (
            <SidebarSection label="Reports">
              <NavItem to="/gp" label="Kitchen Flash" icon={TrendingUp} />
              <NavItem to="/purchases-report" label="Purchases" icon={BarChart2} />
              <NavItem to="/allowances-report" label="Allowances" icon={PieChart} />
              <NavItem to="/sales-gp" label="Sales GP%" icon={Activity} />
              <NavItem to="/usage-variance" label="Usage Variance" icon={ChevronRight} />
              <NavItem to="/purchases/reconcile" label="Reconcile" icon={RefreshCw} />
            </SidebarSection>
          )}

          {can(user, 'logbook') && (
            <SidebarSection label="Kitchen">
              <NavItem to="/logbook" label="Allowance Logbook" icon={BookOpen} />
              <NavItem to="/budget" label="Budget" icon={PieChart} />
              {can(user, 'orders') && <NavItem to="/event-orders" label="Event Orders" icon={Package} />}
            </SidebarSection>
          )}

          {can(user, 'view') && (
            <SidebarSection label="Bookings">
              <NavItem to="/resos" label="ResOS Calendar" icon={Calendar} />
              <NavItem to="/resos-stats" label="Booking Stats" icon={BarChart2} />
              <NavItem to="/residents-table-chart" label="Residents Chart" icon={Users} />
              <NavItem to="/newbook" label="NewBook Data" icon={Hotel} />
            </SidebarSection>
          )}

          {can(user, 'recipes') && (
            <SidebarSection label="Recipes">
              <NavItem to="/ingredients" label="Ingredients" icon={Wheat} />
              <NavItem to="/recipes" label="Recipes" icon={ChefHat} />
              <NavItem to="/dishes" label="Dishes" icon={UtensilsCrossed} />
              {can(user, 'menus') && <NavItem to="/menus" label="Menus" icon={Menu} />}
              <NavItem to="/allergens" label="Allergens" icon={ShieldCheck} />
              <NavItem to="/price-impact" label="Price Impact" icon={TrendingUp} />
            </SidebarSection>
          )}

          {can(user, 'settings') && (
            <SidebarSection label="">
              <NavItem to="/settings" label="Settings" icon={Settings} />
            </SidebarSection>
          )}
        </nav>

        <div className="sidebar-user">{user.name || user.email}</div>
      </aside>

      {/* Mobile top bar */}
      <header className="top-bar">
        <ChefHat size={16} strokeWidth={1.75} color="var(--app-primary)" />
        <span className="top-bar-title">Kitchen</span>
        <nav className="top-bar-nav">
          <NavLink to="/dashboard" className={({ isActive }) => isActive ? 'active' : ''}>Dashboard</NavLink>
          {can(user, 'invoices') && <NavLink to="/invoices" className={({ isActive }) => isActive ? 'active' : ''}>Invoices</NavLink>}
          {can(user, 'view') && <NavLink to="/gp" className={({ isActive }) => isActive ? 'active' : ''}>Reports</NavLink>}
          {can(user, 'recipes') && <NavLink to="/recipes" className={({ isActive }) => isActive ? 'active' : ''}>Recipes</NavLink>}
          {can(user, 'settings') && <NavLink to="/settings" className={({ isActive }) => isActive ? 'active' : ''}>Settings</NavLink>}
        </nav>
      </header>

      <main className="page-content">
        <Outlet />
      </main>
    </div>
  )
}