import axios, { AxiosResponse } from 'axios';
import { Invoice, SalesStatistics as SalesStatistics, LineItem } from '@/types';

const API_URL = '/api/invoices';
const LINE_ITEM_API_URL = '/api/lineitems';

export default {
    /**
     * Retrieves all invoices
     * @returns Promise<Invoice[]>
     */
    async getAllInvoices(): Promise<Invoice[]> {
        const response = await axios.get<Invoice[]>(API_URL);
        return response.data;
    },

    /**
     * Retrieves invoice summary for all time
     * @returns Promise<Invoice[]>
     */
    async getSummaryAll(): Promise<Invoice[]> {
        const response = await axios.get<Invoice[]>(`${API_URL}/summary`);
        return response.data;
    },

    /**
     * Retrieves invoice summary for the current year
     * @returns Promise<Invoice[]>
     */
    async getSummaryThisYear(): Promise<Invoice[]> {
        const response = await axios.get<Invoice[]>(`${API_URL}/summaryThisYear`);
        return response.data;
    },

    /**
     * Retrieves invoice summary for before the current year
     * @returns Promise<Invoice[]>
     */
    async getSummaryBeforeThisYear(): Promise<Invoice[]> {
        const response = await axios.get<Invoice[]>(`${API_URL}/summaryBeforeThisYear`);
        return response.data;
    },

    /**
     * Retrieves sales statistics
     * @returns Promise<InvoiceStatistics>
     */
    async getSalesStatistics(): Promise<SalesStatistics> {
        const response = await axios.get<SalesStatistics>(`${API_URL}/salesStatistics`);
        return response.data;
    },

    /**
     * Creates a new invoice
     * @param invoice - The invoice data to create
     * @returns Promise<Invoice>
     */
    async createInvoice(invoice: Partial<Invoice>): Promise<Invoice> {
        const response = await axios.post<Invoice>(API_URL, invoice);
        return response.data;
    },

    /**
     * Updates an existing invoice
     * @param invoice - The invoice object to update
     * @returns Promise<Invoice>
     */
    async updateInvoice(invoice: Partial<Invoice>): Promise<Invoice> {
        const response = await axios.put<Invoice>(`${API_URL}/${invoice.id}`, invoice);
        return response.data;
    },

    /**
     * Deletes an invoice by ID
     * @param invoiceId - The id of the invoice to delete
     * @returns Promise<AxiosResponse>
     */
    async deleteInvoice(invoiceId: number): Promise<AxiosResponse> {
        const response = await axios.delete(`${API_URL}/${invoiceId}`);
        return response.data;
    },

    /**
     * Retrieves line items for a specific invoice
     * @param invoiceId - The ID of the invoice
     * @returns Promise<LineItem[]>
     */
    async getLineItems(invoiceId: number): Promise<LineItem[]> {
        const response = await axios.get<LineItem[]>(`${LINE_ITEM_API_URL}/${invoiceId}`);
        return response.data;
    },

    /**
     * Sends a reminder for an invoice
     * @param invoiceId - The ID of the invoice to remind
     * @param to - Email address to send the reminder to
     * @param cc - Optional email address to CC the reminder to
     * @returns Promise<AxiosResponse>
     */
    async remindInvoice(invoiceId: number, to: string, cc?: string): Promise<AxiosResponse> {
        const params = { to, cc };
        const response = await axios.get(`${API_URL}/${invoiceId}/remind`, { params });
        return response.data;
    },

    /**
     * Exports an invoice as PDF
     * @param invoiceId - The ID of the invoice to export
     * @returns Promise<Blob>
     */
    async exportPdf(invoiceId: number): Promise<Blob> {
        const response = await axios.get(`${API_URL}/${invoiceId}/pdf`, {
            responseType: 'blob'
        });
        return response.data;
    },

    /**
     * Exports an invoice as XML
     * @param invoiceId - The ID of the invoice to export
     * @returns Promise<Blob>
     */
    async exportXml(invoiceId: number): Promise<Blob> {
        const response = await axios.get(`${API_URL}/${invoiceId}/xml`, {
            responseType: 'blob'
        });
        return response.data;
    }
};