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src/lib/types.ts

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+export interface Cabin {
+  id: number;
+  name: string;
+  capacity: number | null;
+  sort_order: number;
+}
+
+export type ReservationStatus = "confirmed" | "option";
+
+export interface Reservation {
+  id: number;
+  cabin_id: number;
+  guest_name: string;
+  address: string | null;
+  phone: string | null;
+  num_guests: number | null;
+  deposit_amount: number | null;
+  deposit_paid: boolean;
+  status: ReservationStatus;
+  /** Data przyjazdu w formacie YYYY-MM-DD */
+  arrival: string;
+  /** Data wyjazdu w formacie YYYY-MM-DD */
+  departure: string;
+  notes: string | null;
+  /** Cena za dobę w zł */
+  price_per_night: number | null;
+  /** Stan licznika energii na początku pobytu (kWh) */
+  meter_start: number | null;
+  /** Stan licznika energii na końcu pobytu (kWh) */
+  meter_end: number | null;
+  created_at: string;
+}
+
+export type ReservationInput = Omit<Reservation, "id" | "created_at">;
+
+/** Parametry otwarcia dialogu rezerwacji: edycja istniejącej albo nowa w danym domku i terminie. */
+export type ReservationDialogParams =
+  | { reservation: Reservation }
+  | { cabin_id: number; arrival: string };
+
+// --- Faktury ---
+
+export interface Settings {
+  id: number;
+  company_name: string;
+  first_name: string;
+  last_name: string;
+  address: string;
+  nip: string | null;
+  bank_account: string;
+  bank_name: string;
+  issue_place: string;
+  default_pkwiu: string;
+  default_vat_rate: number;
+  /** Cena energii zł/kWh do rozliczania liczników */
+  energy_price: number | null;
+}
+
+export type PaymentMethod = "CASH" | "CARD" | "CARD_CASH" | "SEND";
+
+export interface Invoice {
+  id: number;
+  invoice_number: string;
+  reservation_id: number | null;
+  issue_date: string;
+  sale_date: string;
+  payment_method: PaymentMethod;
+  payment_card: number | null;
+  payment_cash: number | null;
+  payment_due: string;
+  buyer_name: string;
+  buyer_address: string | null;
+  buyer_nip: string | null;
+  seller_company: string;
+  seller_person: string;
+  seller_address: string;
+  seller_nip: string | null;
+  seller_bank_account: string;
+  seller_bank_name: string;
+  issue_place: string;
+  created_at: string;
+}
+
+export interface InvoiceItem {
+  id: number;
+  invoice_id: number;
+  name: string;
+  pkwiu: string | null;
+  quantity: number;
+  /** Cena jednostkowa brutto (VAT liczony od brutto, jak w starym systemie) */
+  unit_price: number;
+  vat_rate: number;
+  position: number;
+}
+
+export type InvoiceItemInput = Omit<InvoiceItem, "id" | "invoice_id" | "position">;
+export type InvoiceInput = Omit<Invoice, "id" | "created_at">;
+
+/** Parametry dialogu faktury: edycja istniejącej, nowa z pobytu albo pusta. */
+export type InvoiceDialogParams =
+  | { invoice: Invoice; items: InvoiceItem[] }
+  | { reservation: Reservation }
+  | { blank: true };
+
+/** Statystyki przychodu w zakresie dat (noclegi liczone tylko w zakresie). */
+export interface RevenueStats {
+  nights_total: number;
+  revenue_total: number;
+  nights_confirmed: number;
+  revenue_confirmed: number;
+}