import { useState, useEffect } from 'react'
import {
  CreditCard, Banknote, Clock, LogIn, LogOut, CheckCircle2,
  Receipt, Zap, Building2, Coffee, Car, Package, ChevronRight,
  User, Printer, BarChart2, Settings2, Wifi, WifiOff,
  FileText, RefreshCw,
} from 'lucide-react'
import { format } from 'date-fns'
import { ru } from 'date-fns/locale'
import { cn, formatCurrency } from '../lib/utils'

// ── Types ─────────────────────────────────────────────────────────────────────

interface RoomBalance {
  roomId: string
  roomNumber: string
  guestName: string
  checkIn: string
  checkOut: string
  totalAmount: number
  paidAmount: number
  nights: number
}

type PaymentMethod = 'cash' | 'terminal'
type ChargePurpose = 'stay' | 'breakfast' | 'transfer' | 'parking' | 'extra'
type PosTab = 'main' | 'report' | 'atol'
type AtolConnection = 'usb' | 'tcp' | 'com'
type TaxSystem = 'osn' | 'usn_income' | 'usn_expense' | 'eshn' | 'psn'

interface ReceiptRecord {
  id: string
  roomNumber: string
  guestName: string
  purposeLabel: string
  amount: number
  method: PaymentMethod
  createdAt: Date
  shiftId: string
}

// ── Mock data ──────────────────────────────────────────────────────────────────

const MOCK_BALANCES: RoomBalance[] = [
  { roomId: 'r1', roomNumber: '101', guestName: 'Дмитрий Волков',       checkIn: '2026-03-10', checkOut: '2026-03-12', totalAmount: 9000,  paidAmount: 4500,  nights: 2 },
  { roomId: 'r2', roomNumber: '201', guestName: 'Игорь Соколов',        checkIn: '2026-03-09', checkOut: '2026-03-11', totalAmount: 14000, paidAmount: 14000, nights: 2 },
  { roomId: 'r3', roomNumber: '301', guestName: 'Наталья Александрова', checkIn: '2026-03-11', checkOut: '2026-03-15', totalAmount: 48000, paidAmount: 24000, nights: 4 },
  { roomId: 'r4', roomNumber: '401', guestName: 'Михаил Орлов',         checkIn: '2026-03-10', checkOut: '2026-03-13', totalAmount: 36000, paidAmount: 0,     nights: 3 },
]

const PURPOSE_LABELS: Record<ChargePurpose, string> = {
  stay:      'Проживание',
  breakfast: 'Завтрак',
  transfer:  'Трансфер',
  parking:   'Парковка',
  extra:     'Доп. услуга',
}

const QUICK_CHARGES: { purpose: ChargePurpose; label: string; amount: number | null; Icon: React.ElementType }[] = [
  { purpose: 'stay',      label: 'Проживание',  amount: null, Icon: Building2 },
  { purpose: 'breakfast', label: 'Завтрак',     amount: 650,  Icon: Coffee },
  { purpose: 'transfer',  label: 'Трансфер',    amount: 2500, Icon: Car },
  { purpose: 'parking',   label: 'Парковка',    amount: 500,  Icon: Package },
  { purpose: 'extra',     label: 'Доп. услуга', amount: null, Icon: Zap },
]

const SEED_RECEIPTS: ReceiptRecord[] = [
  { id: 'rc1', roomNumber: '201', guestName: 'Игорь Соколов',         purposeLabel: 'Проживание', amount: 14000, method: 'terminal', createdAt: new Date(Date.now() - 3600000 * 3), shiftId: 'shift-today' },
  { id: 'rc2', roomNumber: '101', guestName: 'Дмитрий Волков',        purposeLabel: 'Проживание', amount: 4500,  method: 'cash',     createdAt: new Date(Date.now() - 3600000 * 2), shiftId: 'shift-today' },
  { id: 'rc3', roomNumber: '301', guestName: 'Наталья Александрова',  purposeLabel: 'Проживание', amount: 24000, method: 'terminal', createdAt: new Date(Date.now() - 3600000),     shiftId: 'shift-today' },
  { id: 'rc4', roomNumber: '101', guestName: 'Дмитрий Волков',        purposeLabel: 'Завтрак',    amount: 1300,  method: 'cash',     createdAt: new Date(Date.now() - 1800000),     shiftId: 'shift-today' },
]

const TAX_SYSTEM_LABELS: Record<TaxSystem, string> = {
  osn:        'ОСН',
  usn_income: 'УСН доход',
  usn_expense:'УСН расход',
  eshn:       'ЕСХН',
  psn:        'ПСН',
}

// ── Subcomponents ─────────────────────────────────────────────────────────────

function MethodIcon({ method, size = 11 }: { method: PaymentMethod; size?: number }) {
  if (method === 'cash') return <Banknote size={size} className="text-emerald-600" />
  return <CreditCard size={size} className="text-blue-600" />
}

// ── Component ─────────────────────────────────────────────────────────────────

export function PosPage() {
  // Core state
  const [shiftOpen, setShiftOpen]     = useState(true)
  const [shiftStartTime]              = useState<Date>(new Date(Date.now() - 3600000 * 3))
  const [shiftTimer, setShiftTimer]   = useState('')
  const [receipts, setReceipts]       = useState<ReceiptRecord[]>(SEED_RECEIPTS)
  const [selectedRoom, setSelectedRoom] = useState<RoomBalance | null>(MOCK_BALANCES[0])
  const [purpose, setPurpose]         = useState<ChargePurpose>('stay')
  const [amount, setAmount]           = useState<number>(0)
  const [method, setMethod]           = useState<PaymentMethod>('terminal')
  const [notes, setNotes]             = useState('')
  const [printFiscal, setPrintFiscal] = useState(true)
  const [lastReceipt, setLastReceipt] = useState<ReceiptRecord | null>(null)
  const [activeTab, setActiveTab]     = useState<PosTab>('main')

  // Atol settings state
  const [atolConnected, setAtolConnected]     = useState(false)
  const [atolChecking, setAtolChecking]       = useState(false)
  const [atolConnType, setAtolConnType]       = useState<AtolConnection>('usb')
  const [atolIp, setAtolIp]                   = useState('192.168.1.100')
  const [atolPort, setAtolPort]               = useState('9100')
  const [atolComPort, setAtolComPort]         = useState('COM1')
  const [atolBaud, setAtolBaud]               = useState('115200')
  const [atolCashier, setAtolCashier]         = useState('Елена Смирнова')
  const [atolTax, setAtolTax]                 = useState<TaxSystem>('osn')
  const [atolAutoClose, setAtolAutoClose]     = useState(false)
  const [atolSaved, setAtolSaved]             = useState(false)

  // Report state
  const [closeConfirm, setCloseConfirm] = useState(false)

  const shiftId = 'shift-today'

  // Update amount when room or purpose changes
  useEffect(() => {
    if (!selectedRoom) { setAmount(0); return }
    if (purpose === 'stay') {
      setAmount(Math.max(0, selectedRoom.totalAmount - selectedRoom.paidAmount))
    } else {
      const qc = QUICK_CHARGES.find(q => q.purpose === purpose)
      setAmount(qc?.amount ?? 0)
    }
  }, [selectedRoom, purpose])

  // Shift timer
  useEffect(() => {
    if (!shiftOpen) return
    const tick = () => {
      const diff = Math.floor((Date.now() - shiftStartTime.getTime()) / 1000)
      const h = Math.floor(diff / 3600)
      const m = Math.floor((diff % 3600) / 60)
      const s = diff % 60
      setShiftTimer(`${String(h).padStart(2, '0')}:${String(m).padStart(2, '0')}:${String(s).padStart(2, '0')}`)
    }
    tick()
    const id = setInterval(tick, 1000)
    return () => clearInterval(id)
  }, [shiftOpen, shiftStartTime])

  const shiftReceipts = receipts.filter(r => r.shiftId === shiftId)
  const shiftRevenue  = shiftReceipts.reduce((s, r) => s + r.amount, 0)
  const cashRevenue   = shiftReceipts.filter(r => r.method === 'cash').reduce((s, r) => s + r.amount, 0)
  const termRevenue   = shiftReceipts.filter(r => r.method === 'terminal').reduce((s, r) => s + r.amount, 0)
  const cashCount     = shiftReceipts.filter(r => r.method === 'cash').length
  const termCount     = shiftReceipts.filter(r => r.method === 'terminal').length

  const handlePay = () => {
    if (!selectedRoom || amount <= 0 || !shiftOpen) return
    const rec: ReceiptRecord = {
      id:           `rc-${Date.now()}`,
      roomNumber:   selectedRoom.roomNumber,
      guestName:    selectedRoom.guestName,
      purposeLabel: PURPOSE_LABELS[purpose],
      amount,
      method,
      createdAt: new Date(),
      shiftId,
    }
    setReceipts(prev => [rec, ...prev])
    setLastReceipt(rec)
    setNotes('')
  }

  const handleAtolCheck = () => {
    setAtolChecking(true)
    setTimeout(() => {
      setAtolChecking(false)
      setAtolConnected(true)
    }, 1000)
  }

  const handleAtolSave = () => {
    setAtolSaved(true)
    setTimeout(() => setAtolSaved(false), 2000)
  }

  const handleCloseShift = () => {
    setCloseConfirm(false)
    setShiftOpen(false)
    setActiveTab('main')
  }

  const balance = selectedRoom ? Math.max(0, selectedRoom.totalAmount - selectedRoom.paidAmount) : 0
  const isPaid  = selectedRoom ? selectedRoom.paidAmount >= selectedRoom.totalAmount : false

  const TABS: { key: PosTab; label: string; Icon: React.ElementType }[] = [
    { key: 'main',   label: 'Касса',    Icon: Receipt },
    { key: 'report', label: 'X/Z-отчёт', Icon: BarChart2 },
    { key: 'atol',   label: 'АТОЛ',     Icon: Settings2 },
  ]

  return (
    <div className="flex h-full flex-col">

      {/* ── Desktop-only notice on mobile ── */}
      <div className="sm:hidden flex-1 flex flex-col items-center justify-center gap-4 p-8 text-center">
        <div className="w-16 h-16 rounded-2xl bg-slate-100 dark:bg-slate-700 flex items-center justify-center">
          <Receipt size={28} className="text-slate-400" />
        </div>
        <div>
          <p className="text-lg font-semibold text-slate-700 dark:text-slate-300">Касса — только десктоп</p>
          <p className="text-sm text-slate-500 dark:text-slate-400 mt-1">
            Откройте приложение на компьютере или планшете для работы с кассой
          </p>
        </div>
      </div>

      {/* ── Full POS UI (desktop only) ── */}
      <div className="hidden sm:flex sm:flex-col sm:flex-1 sm:overflow-hidden">

      {/* ── Top bar ── */}
      <div className="shrink-0 px-4 py-3 border-b border-slate-200 dark:border-slate-700 bg-white dark:bg-slate-800">
        <div className="flex items-center justify-between flex-wrap gap-2">
          <div>
            <h1 className="text-lg font-bold text-slate-900 dark:text-slate-100">Касса</h1>
            <p className="text-xs text-slate-500 dark:text-slate-400">
              {format(new Date(), 'd MMMM yyyy', { locale: ru })} · Елена Смирнова
            </p>
          </div>
          <div className="flex items-center gap-3">
            {shiftOpen && (
              <div className="flex items-center gap-2 px-3 py-1.5 rounded-xl bg-emerald-50 dark:bg-emerald-900/20 border border-emerald-200 dark:border-emerald-700">
                <Clock size={13} className="text-emerald-600" />
                <span className="text-xs font-mono font-semibold text-emerald-700 dark:text-emerald-300">{shiftTimer}</span>
              </div>
            )}
            <button
              onClick={() => shiftOpen ? setActiveTab('report') : setShiftOpen(true)}
              className={cn(
                'flex items-center gap-1.5 px-3 py-1.5 rounded-xl text-sm font-medium border-2 transition-colors',
                shiftOpen
                  ? 'bg-red-50 border-red-300 text-red-700 dark:bg-red-900/20 dark:border-red-700 dark:text-red-300'
                  : 'bg-emerald-50 border-emerald-300 text-emerald-700 dark:bg-emerald-900/20 dark:border-emerald-700 dark:text-emerald-300',
              )}
            >
              {shiftOpen ? <><LogOut size={14} />Закрыть смену</> : <><LogIn size={14} />Открыть смену</>}
            </button>
          </div>
        </div>

        {/* Tab bar */}
        {shiftOpen && (
          <div className="flex gap-0.5 mt-3 border-b border-slate-200 dark:border-slate-700 -mb-3 pb-0">
            {TABS.map(t => (
              <button
                key={t.key}
                onClick={() => setActiveTab(t.key)}
                className={cn(
                  'flex items-center gap-1.5 px-4 py-2 text-sm font-medium border-b-2 transition-colors',
                  activeTab === t.key
                    ? 'border-brand-600 text-brand-700 dark:text-brand-400'
                    : 'border-transparent text-slate-500 dark:text-slate-400 hover:text-slate-800 dark:hover:text-slate-200',
                )}
              >
                <t.Icon size={13} />
                {t.label}
              </button>
            ))}
          </div>
        )}
      </div>

      {/* ── Shift closed screen ── */}
      {!shiftOpen ? (
        <div className="flex-1 flex items-center justify-center flex-col gap-4 text-slate-400">
          <Receipt size={56} className="opacity-20" />
          <div className="text-center">
            <p className="text-lg font-semibold text-slate-600 dark:text-slate-300">Смена закрыта</p>
            <p className="text-sm">Откройте смену для начала работы</p>
          </div>
          <button onClick={() => setShiftOpen(true)} className="btn-primary">
            <LogIn size={15} />Открыть смену
          </button>
        </div>
      ) : (
        <>
          {/* ══════════════════════ TAB: main ══════════════════════ */}
          {activeTab === 'main' && (
            <div className="flex flex-col sm:flex-row flex-1 overflow-hidden">

              {/* ── Заезды: horizontal scroll on mobile, sidebar on desktop ── */}
              <div className="sm:w-56 flex-shrink-0 border-b sm:border-b-0 sm:border-r border-slate-200 dark:border-slate-700 bg-slate-50 dark:bg-slate-800/50">
                <div className="px-3 py-2 border-b border-slate-200 dark:border-slate-700 hidden sm:block">
                  <p className="text-[11px] font-semibold text-slate-500 dark:text-slate-400 uppercase tracking-wide">Заезды</p>
                </div>
                {/* Mobile: horizontal scroll row */}
                <div className="flex sm:hidden gap-2 p-2 overflow-x-auto">
                  {MOCK_BALANCES.map(rb => {
                    const debt = Math.max(0, rb.totalAmount - rb.paidAmount)
                    const paid = debt === 0
                    const sel  = selectedRoom?.roomId === rb.roomId
                    return (
                      <button
                        key={rb.roomId}
                        onClick={() => setSelectedRoom(rb)}
                        className={cn(
                          'shrink-0 rounded-lg px-3 py-1.5 border transition-all flex items-center gap-1.5',
                          sel
                            ? 'border-brand-400 bg-brand-50 dark:bg-brand-900/20 dark:border-brand-600'
                            : 'border-slate-200 dark:border-slate-600 bg-white dark:bg-slate-800',
                        )}
                      >
                        <span className="text-xs font-bold text-slate-900 dark:text-slate-100">№{rb.roomNumber}</span>
                        {paid
                          ? <span className="text-[9px] font-semibold px-1 py-0.5 rounded-full bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-300">✓</span>
                          : <span className="text-[9px] font-semibold px-1 py-0.5 rounded-full bg-red-100 text-red-700 dark:bg-red-900/30 dark:text-red-300 whitespace-nowrap">{formatCurrency(debt)}</span>
                        }
                      </button>
                    )
                  })}
                </div>
                {/* Desktop: vertical list */}
                <div className="hidden sm:block flex-1 overflow-y-auto p-2 space-y-1">
                  {MOCK_BALANCES.map(rb => {
                    const debt = Math.max(0, rb.totalAmount - rb.paidAmount)
                    const paid = debt === 0
                    const sel  = selectedRoom?.roomId === rb.roomId
                    return (
                      <button
                        key={rb.roomId}
                        onClick={() => setSelectedRoom(rb)}
                        className={cn(
                          'w-full text-left rounded-lg px-2.5 py-2 border transition-all flex items-center gap-2',
                          sel
                            ? 'border-brand-400 bg-brand-50 dark:bg-brand-900/20 dark:border-brand-600'
                            : 'border-slate-200 dark:border-slate-600 bg-white dark:bg-slate-800 hover:border-brand-300',
                        )}
                      >
                        <div className="flex-1 min-w-0">
                          <div className="flex items-center gap-1.5">
                            <span className="text-xs font-bold text-slate-900 dark:text-slate-100">№{rb.roomNumber}</span>
                            <span className="text-[10px] text-slate-500 dark:text-slate-400 truncate flex-1">{rb.guestName.split(' ')[0]} {rb.guestName.split(' ')[1]?.[0]}.</span>
                          </div>
                        </div>
                        {paid ? (
                          <span className="shrink-0 text-[9px] font-semibold px-1.5 py-0.5 rounded-full bg-emerald-100 text-emerald-700 dark:bg-emerald-900/30 dark:text-emerald-300 whitespace-nowrap">✓</span>
                        ) : (
                          <span className="shrink-0 text-[9px] font-semibold px-1.5 py-0.5 rounded-full bg-red-100 text-red-700 dark:bg-red-900/30 dark:text-red-300 whitespace-nowrap">
                            {formatCurrency(debt)}
                          </span>
                        )}
                      </button>
                    )
                  })}
                </div>
              </div>

              {/* ── Center: payment form ── */}
              <div className="flex-1 flex flex-col overflow-y-auto p-4 sm:p-5 gap-5">
                {selectedRoom ? (
                  <>
                    {/* Guest info */}
                    <div className="card p-4">
                      <div className="flex items-center gap-3">
                        <div className="w-10 h-10 rounded-full bg-brand-100 dark:bg-brand-900/30 flex items-center justify-center shrink-0">
                          <User size={18} className="text-brand-600 dark:text-brand-400" />
                        </div>
                        <div className="flex-1">
                          <p className="font-semibold text-slate-900 dark:text-slate-100">{selectedRoom.guestName}</p>
                          <p className="text-xs text-slate-500 dark:text-slate-400">
                            Номер {selectedRoom.roomNumber} · {selectedRoom.nights} {selectedRoom.nights === 1 ? 'ночь' : selectedRoom.nights < 5 ? 'ночи' : 'ночей'}
                          </p>
                        </div>
                        <div className="text-right">
                          <p className="text-xs text-slate-500 dark:text-slate-400">К оплате</p>
                          <p className={cn('text-lg font-bold', isPaid ? 'text-emerald-600 dark:text-emerald-400' : 'text-red-600 dark:text-red-400')}>
                            {formatCurrency(balance)}
                          </p>
                        </div>
                      </div>
                      {/* Balance bar */}
                      <div className="mt-3">
                        <div className="flex items-center justify-between text-xs text-slate-500 mb-1">
                          <span>Оплачено {formatCurrency(selectedRoom.paidAmount)}</span>
                          <span>Всего {formatCurrency(selectedRoom.totalAmount)}</span>
                        </div>
                        <div className="h-2 rounded-full bg-slate-200 dark:bg-slate-600 overflow-hidden">
                          <div
                            className="h-full rounded-full bg-emerald-500 transition-all"
                            style={{ width: `${Math.min(100, (selectedRoom.paidAmount / selectedRoom.totalAmount) * 100)}%` }}
                          />
                        </div>
                      </div>
                    </div>

                    {/* Quick charge buttons */}
                    <div>
                      <p className="text-xs font-semibold text-slate-500 dark:text-slate-400 uppercase tracking-wide mb-2">Назначение платежа</p>
                      <div className="grid grid-cols-5 gap-2">
                        {QUICK_CHARGES.map(qc => (
                          <button
                            key={qc.purpose}
                            onClick={() => setPurpose(qc.purpose)}
                            className={cn(
                              'flex flex-col items-center gap-1.5 p-3 rounded-xl border-2 text-xs font-medium transition-all',
                              purpose === qc.purpose
                                ? 'border-brand-500 bg-brand-50 dark:bg-brand-900/20 text-brand-700 dark:text-brand-300'
                                : 'border-slate-200 dark:border-slate-600 bg-white dark:bg-slate-800 text-slate-600 dark:text-slate-400 hover:border-brand-300',
                            )}
                          >
                            <qc.Icon size={18} />
                            {qc.label}
                          </button>
                        ))}
                      </div>
                    </div>

                    {/* Amount */}
                    <div>
                      <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-1.5">Сумма (₽)</label>
                      <input
                        type="number"
                        min={0}
                        className="input text-2xl font-bold h-14 w-full"
                        value={amount || ''}
                        onChange={e => setAmount(Math.max(0, parseInt(e.target.value) || 0))}
                        placeholder="0"
                      />
                    </div>

                    {/* Payment method */}
                    <div>
                      <p className="text-sm font-medium text-slate-700 dark:text-slate-300 mb-2">Способ оплаты</p>
                      <div className="grid grid-cols-2 gap-2">
                        {([
                          { key: 'cash',     label: 'Наличные', Icon: Banknote,   cls: 'emerald' },
                          { key: 'terminal', label: 'Терминал', Icon: CreditCard, cls: 'blue' },
                        ] as const).map(m => (
                          <button
                            key={m.key}
                            onClick={() => setMethod(m.key)}
                            className={cn(
                              'flex flex-col items-center gap-2 py-3 rounded-xl border-2 text-sm font-medium transition-colors',
                              method === m.key
                                ? m.cls === 'emerald' ? 'bg-emerald-600 border-emerald-600 text-white'
                                :                       'bg-blue-600 border-blue-600 text-white'
                                : 'border-slate-200 dark:border-slate-600 bg-white dark:bg-slate-800 text-slate-700 dark:text-slate-300 hover:border-slate-300',
                            )}
                          >
                            <m.Icon size={18} />
                            {m.label}
                          </button>
                        ))}
                      </div>
                    </div>

                    {/* Fiscal receipt (ATOL) */}
                    <div className={cn(
                      'flex items-center justify-between gap-3 px-4 py-3 rounded-xl border-2 transition-colors',
                      atolConnected
                        ? printFiscal
                          ? 'border-violet-400 bg-violet-50 dark:bg-violet-900/20'
                          : 'border-slate-200 dark:border-slate-600'
                        : 'border-slate-200 dark:border-slate-600 opacity-50',
                    )}>
                      <div className="flex items-center gap-3">
                        <Printer size={18} className={atolConnected && printFiscal ? 'text-violet-600' : 'text-slate-400'} />
                        <div>
                          <p className="text-sm font-medium text-slate-800 dark:text-slate-200">
                            Фискальный чек (АТОЛ)
                          </p>
                          <p className="text-[11px] text-slate-500 dark:text-slate-400">
                            {atolConnected ? 'Регистратор подключён · автопечать чека' : 'Регистратор не подключён'}
                          </p>
                        </div>
                      </div>
                      <button
                        onClick={() => atolConnected && setPrintFiscal(v => !v)}
                        disabled={!atolConnected}
                        className={cn('relative w-11 h-6 rounded-full transition-colors shrink-0', printFiscal && atolConnected ? 'bg-violet-600' : 'bg-slate-300 dark:bg-slate-600')}
                      >
                        <div className={cn('absolute top-1 w-4 h-4 rounded-full bg-white shadow transition-transform', printFiscal && atolConnected ? 'left-[22px]' : 'left-1')} />
                      </button>
                    </div>

                    {/* Notes */}
                    <div>
                      <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-1.5">Примечание</label>
                      <input
                        type="text"
                        className="input"
                        placeholder="Необязательно"
                        value={notes}
                        onChange={e => setNotes(e.target.value)}
                      />
                    </div>

                    {/* Pay button */}
                    <button
                      onClick={handlePay}
                      disabled={amount <= 0}
                      className="btn-primary w-full justify-center py-4 text-base disabled:opacity-40 disabled:cursor-not-allowed"
                    >
                      <ChevronRight size={18} />
                      Провести оплату {amount > 0 ? formatCurrency(amount) : ''}
                    </button>
                  </>
                ) : (
                  <div className="flex-1 flex items-center justify-center text-slate-400">
                    <p className="text-sm">Выберите гостя из списка слева</p>
                  </div>
                )}
              </div>

              {/* ── Right sidebar: Чеки (w-64) ── */}
              <div className="w-64 flex flex-col border-l border-slate-200 dark:border-slate-700 bg-white dark:bg-slate-800 shrink-0 overflow-hidden">
                {/* Shift totals */}
                <div className="px-3 py-2 border-b border-slate-200 dark:border-slate-700 bg-slate-50 dark:bg-slate-700/50">
                  <div className="flex items-center justify-between mb-1.5">
                    <div className="flex items-center gap-1.5">
                      <Receipt size={12} className="text-slate-400" />
                      <span className="text-[11px] font-semibold text-slate-500 dark:text-slate-400 uppercase tracking-wide">Чеки</span>
                    </div>
                    <span className="text-[10px] bg-slate-200 dark:bg-slate-600 text-slate-600 dark:text-slate-400 px-1.5 py-0.5 rounded-full font-semibold">
                      {shiftReceipts.length}
                    </span>
                  </div>
                  <div className="space-y-0.5">
                    <div className="flex justify-between text-[10px] text-slate-500">
                      <span className="flex items-center gap-1"><Banknote size={9} className="text-emerald-600" />Наличные</span>
                      <span className="font-semibold text-slate-700 dark:text-slate-300">{formatCurrency(cashRevenue)}</span>
                    </div>
                    <div className="flex justify-between text-[10px] text-slate-500">
                      <span className="flex items-center gap-1"><CreditCard size={9} className="text-blue-600" />Терминал</span>
                      <span className="font-semibold text-slate-700 dark:text-slate-300">{formatCurrency(termRevenue)}</span>
                    </div>
                    <div className="flex justify-between text-[10px] border-t border-slate-200 dark:border-slate-600 pt-0.5 mt-0.5">
                      <span className="font-semibold text-slate-600 dark:text-slate-400">Итого</span>
                      <span className="font-bold text-slate-900 dark:text-slate-100">{formatCurrency(shiftRevenue)}</span>
                    </div>
                  </div>
                </div>

                {/* Receipt list — compact rows */}
                <div className="flex-1 overflow-y-auto">
                  {shiftReceipts.map(r => (
                    <div
                      key={r.id}
                      className="flex items-center gap-2 px-3 py-2 border-b border-slate-100 dark:border-slate-700/60 hover:bg-slate-50 dark:hover:bg-slate-700/30 transition-colors"
                    >
                      <span className="text-[10px] font-mono text-slate-400 shrink-0 w-8">{format(r.createdAt, 'HH:mm')}</span>
                      <span className="text-[11px] font-semibold text-slate-700 dark:text-slate-300 shrink-0 w-8">№{r.roomNumber}</span>
                      <span className="text-[11px] text-slate-800 dark:text-slate-200 flex-1 font-medium">{formatCurrency(r.amount)}</span>
                      <MethodIcon method={r.method} size={11} />
                    </div>
                  ))}
                </div>
              </div>
            </div>
          )}

          {/* ══════════════════════ TAB: report ══════════════════════ */}
          {activeTab === 'report' && (
            <div className="flex-1 overflow-y-auto p-6">
              <div className="max-w-lg mx-auto space-y-4">
                {/* X-report card */}
                <div className="card p-0 overflow-hidden font-mono">
                  {/* Header */}
                  <div className="bg-slate-800 dark:bg-slate-900 text-white px-6 py-4 text-center">
                    <p className="text-xs opacity-60 uppercase tracking-widest mb-1">X-ОТЧЁТ (сменный)</p>
                    <p className="text-base font-bold">Гранд Палас</p>
                    <p className="text-xs opacity-70 mt-0.5">Кассир: Елена Смирнова</p>
                    <p className="text-xs opacity-70">{format(new Date(), 'd MMMM yyyy, HH:mm', { locale: ru })}</p>
                    <div className="mt-2 inline-flex items-center gap-1.5 bg-white/10 rounded-lg px-3 py-1 text-xs">
                      <Clock size={11} />
                      Смена №1 · открыта {format(shiftStartTime, 'HH:mm')} · {shiftTimer}
                    </div>
                  </div>

                  {/* Revenue table */}
                  <div className="px-6 py-4">
                    <table className="w-full text-sm">
                      <thead>
                        <tr className="border-b border-slate-200 dark:border-slate-600">
                          <th className="text-left pb-2 text-xs text-slate-500 font-semibold">Способ оплаты</th>
                          <th className="text-right pb-2 text-xs text-slate-500 font-semibold">Чеков</th>
                          <th className="text-right pb-2 text-xs text-slate-500 font-semibold">Сумма</th>
                        </tr>
                      </thead>
                      <tbody className="divide-y divide-slate-100 dark:divide-slate-700">
                        <tr>
                          <td className="py-2.5 flex items-center gap-2">
                            <Banknote size={14} className="text-emerald-600" />
                            <span className="text-slate-700 dark:text-slate-300">Наличные</span>
                          </td>
                          <td className="py-2.5 text-right text-slate-500 text-xs">{cashCount}</td>
                          <td className="py-2.5 text-right font-semibold text-slate-900 dark:text-slate-100">{formatCurrency(cashRevenue)}</td>
                        </tr>
                        <tr>
                          <td className="py-2.5 flex items-center gap-2">
                            <CreditCard size={14} className="text-blue-600" />
                            <span className="text-slate-700 dark:text-slate-300">Терминал</span>
                          </td>
                          <td className="py-2.5 text-right text-slate-500 text-xs">{termCount}</td>
                          <td className="py-2.5 text-right font-semibold text-slate-900 dark:text-slate-100">{formatCurrency(termRevenue)}</td>
                        </tr>
                        <tr className="border-t-2 border-slate-300 dark:border-slate-500">
                          <td className="pt-3 pb-2 font-bold text-slate-900 dark:text-slate-100">ИТОГО</td>
                          <td className="pt-3 pb-2 text-right font-bold text-slate-500">{shiftReceipts.length}</td>
                          <td className="pt-3 pb-2 text-right font-bold text-lg text-slate-900 dark:text-slate-100">{formatCurrency(shiftRevenue)}</td>
                        </tr>
                      </tbody>
                    </table>

                    {/* Fiscal register info */}
                    <div className="mt-3 flex items-center gap-2 text-xs text-slate-500 dark:text-slate-400">
                      <Printer size={13} className="text-violet-500" />
                      Фискальный регистратор АТОЛ: {atolConnected ? <span className="text-emerald-600 font-medium">подключён</span> : <span className="text-red-500 font-medium">не подключён</span>}
                    </div>

                    {/* Refunds */}
                    <div className="mt-4 pt-4 border-t border-slate-200 dark:border-slate-600">
                      <div className="flex justify-between text-sm">
                        <span className="text-slate-500">Возвраты</span>
                        <span className="font-semibold text-slate-700 dark:text-slate-300">{formatCurrency(0)}</span>
                      </div>
                      <div className="flex justify-between text-sm mt-1">
                        <span className="text-slate-500">Чистая выручка</span>
                        <span className="font-bold text-emerald-600 dark:text-emerald-400">{formatCurrency(shiftRevenue)}</span>
                      </div>
                    </div>

                    {/* Footer note */}
                    <div className="mt-4 p-2.5 rounded-lg bg-amber-50 dark:bg-amber-900/20 border border-amber-200 dark:border-amber-700">
                      <p className="text-xs text-amber-700 dark:text-amber-300 text-center">
                        Следующий шаг: закрыть смену (Z-отчёт) для передачи данных в ФНС
                      </p>
                    </div>
                  </div>
                </div>

                {/* Actions */}
                <div className="flex gap-3">
                  <button className="btn-secondary flex-1 justify-center gap-2">
                    <FileText size={15} />
                    Печать X-отчёта
                  </button>
                  <button
                    onClick={() => setCloseConfirm(true)}
                    className="flex-1 flex items-center justify-center gap-2 px-4 py-2.5 rounded-xl bg-red-600 hover:bg-red-700 text-white font-medium text-sm transition-colors"
                  >
                    <Printer size={15} />
                    Закрыть смену (Z-отчёт)
                  </button>
                </div>
              </div>
            </div>
          )}

          {/* ══════════════════════ TAB: atol ══════════════════════ */}
          {activeTab === 'atol' && (
            <div className="flex-1 overflow-y-auto p-6">
              <div className="max-w-lg mx-auto space-y-5">

                {/* Connection status */}
                <div className="card p-5 space-y-4">
                  <div className="flex items-center justify-between">
                    <h3 className="font-semibold text-slate-900 dark:text-slate-100">Подключение к АТОЛ</h3>
                    <div className="flex items-center gap-2">
                      <span className={cn('w-2 h-2 rounded-full', atolConnected ? 'bg-emerald-500' : 'bg-red-500')} />
                      {atolConnected
                        ? <span className="text-sm text-emerald-600 dark:text-emerald-400 font-medium flex items-center gap-1"><Wifi size={13} />Подключено</span>
                        : <span className="text-sm text-red-600 dark:text-red-400 font-medium flex items-center gap-1"><WifiOff size={13} />Нет связи</span>
                      }
                    </div>
                  </div>

                  <button
                    onClick={handleAtolCheck}
                    disabled={atolChecking}
                    className="btn-secondary gap-2 disabled:opacity-60"
                  >
                    <RefreshCw size={14} className={atolChecking ? 'animate-spin' : ''} />
                    {atolChecking ? 'Проверяем...' : 'Проверить соединение'}
                  </button>

                  {/* Connection type */}
                  <div>
                    <p className="text-sm font-medium text-slate-700 dark:text-slate-300 mb-2">Тип подключения</p>
                    <div className="flex gap-2">
                      {([
                        { key: 'usb', label: 'USB' },
                        { key: 'tcp', label: 'TCP/IP' },
                        { key: 'com', label: 'COM-порт' },
                      ] as const).map(ct => (
                        <button
                          key={ct.key}
                          onClick={() => setAtolConnType(ct.key)}
                          className={cn(
                            'px-3 py-1.5 rounded-lg text-sm font-medium border transition-colors',
                            atolConnType === ct.key
                              ? 'bg-brand-600 border-brand-600 text-white'
                              : 'border-slate-200 dark:border-slate-600 text-slate-600 dark:text-slate-400 hover:border-brand-400',
                          )}
                        >
                          {ct.label}
                        </button>
                      ))}
                    </div>
                  </div>

                  {/* TCP/IP fields */}
                  {atolConnType === 'tcp' && (
                    <div className="grid grid-cols-2 gap-3">
                      <div>
                        <label className="block text-xs font-medium text-slate-600 dark:text-slate-400 mb-1">IP-адрес</label>
                        <input
                          type="text"
                          className="input"
                          value={atolIp}
                          onChange={e => setAtolIp(e.target.value)}
                          placeholder="192.168.1.100"
                        />
                      </div>
                      <div>
                        <label className="block text-xs font-medium text-slate-600 dark:text-slate-400 mb-1">Порт</label>
                        <input
                          type="text"
                          className="input"
                          value={atolPort}
                          onChange={e => setAtolPort(e.target.value)}
                          placeholder="9100"
                        />
                      </div>
                    </div>
                  )}

                  {/* COM port fields */}
                  {atolConnType === 'com' && (
                    <div className="grid grid-cols-2 gap-3">
                      <div>
                        <label className="block text-xs font-medium text-slate-600 dark:text-slate-400 mb-1">COM-порт</label>
                        <select className="input" value={atolComPort} onChange={e => setAtolComPort(e.target.value)}>
                          {['COM1','COM2','COM3','COM4','COM5','COM6','COM7','COM8'].map(p => (
                            <option key={p} value={p}>{p}</option>
                          ))}
                        </select>
                      </div>
                      <div>
                        <label className="block text-xs font-medium text-slate-600 dark:text-slate-400 mb-1">Скорость (baud)</label>
                        <select className="input" value={atolBaud} onChange={e => setAtolBaud(e.target.value)}>
                          {['9600','19200','38400','115200'].map(b => (
                            <option key={b} value={b}>{b}</option>
                          ))}
                        </select>
                      </div>
                    </div>
                  )}
                </div>

                {/* Cashier & tax */}
                <div className="card p-5 space-y-4">
                  <h3 className="font-semibold text-slate-900 dark:text-slate-100">Параметры кассира</h3>
                  <div>
                    <label className="block text-sm font-medium text-slate-700 dark:text-slate-300 mb-1.5">Имя кассира</label>
                    <input
                      type="text"
                      className="input"
                      value={atolCashier}
                      onChange={e => setAtolCashier(e.target.value)}
                      placeholder="Фамилия Имя"
                    />
                  </div>
                  <div>
                    <p className="text-sm font-medium text-slate-700 dark:text-slate-300 mb-2">Система налогообложения</p>
                    <div className="flex flex-wrap gap-2">
                      {(Object.keys(TAX_SYSTEM_LABELS) as TaxSystem[]).map(ts => (
                        <button
                          key={ts}
                          onClick={() => setAtolTax(ts)}
                          className={cn(
                            'px-3 py-1.5 rounded-lg text-sm font-medium border transition-colors',
                            atolTax === ts
                              ? 'bg-brand-600 border-brand-600 text-white'
                              : 'border-slate-200 dark:border-slate-600 text-slate-600 dark:text-slate-400 hover:border-brand-400',
                          )}
                        >
                          {TAX_SYSTEM_LABELS[ts]}
                        </button>
                      ))}
                    </div>
                  </div>
                </div>

                {/* Auto close toggle */}
                <div className="card p-5">
                  <div className="flex items-center justify-between gap-4">
                    <div>
                      <p className="text-sm font-semibold text-slate-800 dark:text-slate-200">Автоматически закрывать смену</p>
                      <p className="text-xs text-slate-500 dark:text-slate-400 mt-0.5">В конце дня авто-печать Z-отчёта и закрытие смены</p>
                    </div>
                    <button
                      onClick={() => setAtolAutoClose(v => !v)}
                      className={cn('relative w-11 h-6 rounded-full transition-colors shrink-0', atolAutoClose ? 'bg-brand-600' : 'bg-slate-300 dark:bg-slate-600')}
                    >
                      <div className={cn('absolute top-1 w-4 h-4 rounded-full bg-white shadow transition-transform', atolAutoClose ? 'left-[22px]' : 'left-1')} />
                    </button>
                  </div>
                </div>

                {/* Save button */}
                <button
                  onClick={handleAtolSave}
                  className="btn-primary w-full justify-center py-3"
                >
                  {atolSaved ? 'Сохранено ✓' : 'Сохранить настройки'}
                </button>
              </div>
            </div>
          )}
        </>
      )}

      {/* ── Receipt success overlay ── */}
      {lastReceipt && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50">
          <div className="bg-white dark:bg-slate-800 rounded-2xl shadow-2xl p-6 sm:p-8 w-[calc(100vw-2rem)] sm:w-80 text-center space-y-4">
            <CheckCircle2 size={56} className="text-emerald-500 mx-auto" />
            <div>
              <p className="text-xl font-bold text-slate-900 dark:text-slate-100">Оплата принята</p>
              <p className="text-3xl font-bold text-emerald-600 mt-1">{formatCurrency(lastReceipt.amount)}</p>
              <p className="text-sm text-slate-500 mt-1">
                {lastReceipt.method === 'cash' ? 'Наличными' : 'Терминал'} · {format(lastReceipt.createdAt, 'HH:mm')}
                {printFiscal && atolConnected && <span className="ml-2 text-violet-600 font-medium">· Фискальный чек распечатан</span>}
              </p>
            </div>
            <div className="text-left bg-slate-50 dark:bg-slate-700/50 rounded-xl p-3 space-y-1">
              <div className="flex justify-between text-sm">
                <span className="text-slate-500">Гость</span>
                <span className="font-medium text-slate-800 dark:text-slate-200">{lastReceipt.guestName}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-slate-500">Номер</span>
                <span className="font-medium text-slate-800 dark:text-slate-200">№{lastReceipt.roomNumber}</span>
              </div>
              <div className="flex justify-between text-sm">
                <span className="text-slate-500">Назначение</span>
                <span className="font-medium text-slate-800 dark:text-slate-200">{lastReceipt.purposeLabel}</span>
              </div>
            </div>
            <button onClick={() => setLastReceipt(null)} className="btn-primary w-full justify-center">
              Готово
            </button>
          </div>
        </div>
      )}

      {/* ── Close shift confirmation modal ── */}
      {closeConfirm && (
        <div className="fixed inset-0 z-50 flex items-center justify-center bg-black/50">
          <div className="bg-white dark:bg-slate-800 rounded-2xl shadow-2xl p-6 w-[calc(100vw-2rem)] sm:w-96 space-y-4">
            <div className="flex items-center gap-3">
              <div className="w-10 h-10 rounded-full bg-red-100 dark:bg-red-900/30 flex items-center justify-center">
                <Printer size={18} className="text-red-600" />
              </div>
              <div>
                <p className="font-bold text-slate-900 dark:text-slate-100">Закрыть смену?</p>
                <p className="text-xs text-slate-500 dark:text-slate-400">Будет напечатан Z-отчёт и смена закроется</p>
              </div>
            </div>
            <div className="bg-slate-50 dark:bg-slate-700/50 rounded-xl p-3 text-sm space-y-1">
              <div className="flex justify-between">
                <span className="text-slate-500">Итого за смену</span>
                <span className="font-bold text-slate-900 dark:text-slate-100">{formatCurrency(shiftRevenue)}</span>
              </div>
              <div className="flex justify-between">
                <span className="text-slate-500">Чеков</span>
                <span className="font-semibold text-slate-700 dark:text-slate-300">{shiftReceipts.length}</span>
              </div>
            </div>
            <div className="flex gap-3">
              <button onClick={() => setCloseConfirm(false)} className="btn-secondary flex-1 justify-center">Отмена</button>
              <button
                onClick={handleCloseShift}
                className="flex-1 flex items-center justify-center gap-2 px-4 py-2.5 rounded-xl bg-red-600 hover:bg-red-700 text-white font-medium text-sm transition-colors"
              >
                <Printer size={14} />
                Закрыть и печатать
              </button>
            </div>
          </div>
        </div>
      )}
      </div>{/* end desktop-only wrapper */}
    </div>
  )
}