import { Observable } from 'rxjs';
import { SubtrakService } from './subtrak.service';
import { Invoice, InvoiceWithRelations, ListInvoicesParams, PaginatedResponse, InvoiceStatus } from '../models';
import * as i0 from "@angular/core";
/**
 * Service for managing customer invoices
 *
 * @example
 * ```typescript
 * constructor(private invoices: InvoicesService) {}
 *
 * // List invoices
 * this.invoices.listInvoices({ customerId: 'cus_123' }).subscribe(response => {
 *   console.log('Invoices:', response.data);
 * });
 *
 * // Download invoice PDF
 * this.invoices.downloadInvoicePdf('inv_123').subscribe(blob => {
 *   // Create download link
 *   const url = URL.createObjectURL(blob);
 *   const a = document.createElement('a');
 *   a.href = url;
 *   a.download = 'invoice.pdf';
 *   a.click();
 * });
 * ```
 */
export declare class InvoicesService {
    private subtrak;
    constructor(subtrak: SubtrakService);
    /**
     * List invoices with optional filtering
     *
     * @param params - Query parameters for filtering
     * @returns Observable of paginated invoices
     */
    listInvoices(params?: ListInvoicesParams): Observable<PaginatedResponse<InvoiceWithRelations>>;
    /**
     * Get a specific invoice by ID
     *
     * @param invoiceId - Invoice ID
     * @returns Observable of the invoice
     */
    getInvoice(invoiceId: string): Observable<InvoiceWithRelations>;
    /**
     * Get invoice PDF URL
     *
     * @param invoiceId - Invoice ID
     * @returns Observable of PDF URL
     */
    getInvoicePdfUrl(invoiceId: string): Observable<string>;
    /**
     * Download invoice as PDF blob
     *
     * @param invoiceId - Invoice ID
     * @returns Observable of Blob
     */
    downloadInvoicePdf(invoiceId: string): Observable<Blob>;
    /**
     * Send invoice via email
     *
     * @param invoiceId - Invoice ID
     * @param email - Email address to send to (optional, defaults to customer email)
     * @returns Observable of void
     */
    sendInvoiceEmail(invoiceId: string, email?: string): Observable<void>;
    /**
     * Get invoices for a specific customer
     *
     * @param customerId - Customer ID
     * @param status - Optional status filter
     * @returns Observable of invoices
     */
    getCustomerInvoices(customerId: string, status?: InvoiceStatus): Observable<Invoice[]>;
    /**
     * Get invoices for a specific subscription
     *
     * @param subscriptionId - Subscription ID
     * @returns Observable of invoices
     */
    getSubscriptionInvoices(subscriptionId: string): Observable<Invoice[]>;
    /**
     * Get paid invoices for a customer
     *
     * @param customerId - Customer ID
     * @returns Observable of paid invoices
     */
    getPaidInvoices(customerId: string): Observable<Invoice[]>;
    /**
     * Get unpaid (open) invoices for a customer
     *
     * @param customerId - Customer ID
     * @returns Observable of open invoices
     */
    getUnpaidInvoices(customerId: string): Observable<Invoice[]>;
    /**
     * Get the latest invoice for a customer
     *
     * @param customerId - Customer ID
     * @returns Observable of the latest invoice
     */
    getLatestInvoice(customerId: string): Observable<Invoice>;
    /**
     * Calculate total amount paid by customer
     *
     * @param customerId - Customer ID
     * @returns Observable of total amount
     */
    getTotalPaid(customerId: string): Observable<number>;
    /**
     * Calculate total outstanding amount for customer
     *
     * @param customerId - Customer ID
     * @returns Observable of total outstanding
     */
    getTotalOutstanding(customerId: string): Observable<number>;
    /**
     * Check if customer has any unpaid invoices
     *
     * @param customerId - Customer ID
     * @returns Observable of boolean
     */
    hasUnpaidInvoices(customerId: string): Observable<boolean>;
    /**
     * Get invoice count for a customer
     *
     * @param customerId - Customer ID
     * @returns Observable of count
     */
    getInvoiceCount(customerId: string): Observable<number>;
    static ɵfac: i0.ɵɵFactoryDeclaration<InvoicesService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<InvoicesService>;
}