very first commit

src/app/services/api.service.ts

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+import { Injectable } from '@angular/core';
+import { HttpClient, HttpParams } from '@angular/common/http';
+import { Observable } from 'rxjs';
+import { map } from 'rxjs/operators';
+import { Category, Item } from '../models';
+import { environment } from '../../environments/environment';
+
+@Injectable({
+  providedIn: 'root'
+})
+export class ApiService {
+  private readonly baseUrl = environment.apiUrl;
+  private readonly qrBaseUrl = environment.apiUrl;
+
+  constructor(private http: HttpClient) {}
+
+  private normalizeItem(item: Item): Item {
+    return {
+      ...item,
+      remainings: item.remainings || 'high'
+    };
+  }
+
+  private normalizeItems(items: Item[] | null | undefined): Item[] {
+    if (!items || !Array.isArray(items)) {
+      return [];
+    }
+    return items.map(item => this.normalizeItem(item));
+  }
+
+  ping(): Observable<{ message: string }> {
+    return this.http.get<{ message: string }>(`${this.baseUrl}/ping`);
+  }
+
+  getCategories(): Observable<Category[]> {
+    return this.http.get<Category[]>(`${this.baseUrl}/category`);
+  }
+
+  getCategoryItems(categoryID: number, count: number = 50, skip: number = 0): Observable<Item[]> {
+    const params = new HttpParams()
+      .set('count', count.toString())
+      .set('skip', skip.toString());
+    return this.http.get<Item[]>(`${this.baseUrl}/category/${categoryID}`, { params })
+      .pipe(map(items => this.normalizeItems(items)));
+  }
+
+  getItem(itemID: number): Observable<Item> {
+    return this.http.get<Item>(`${this.baseUrl}/item/${itemID}`)
+      .pipe(map(item => this.normalizeItem(item)));
+  }
+
+  searchItems(search: string, count: number = 50, skip: number = 0): Observable<{ items: Item[], total: number }> {
+    const params = new HttpParams()
+      .set('search', search)
+      .set('count', count.toString())
+      .set('skip', skip.toString());
+    return this.http.get<{ items: Item[], total: number, count: number, skip: number }>(`${this.baseUrl}/searchitems`, { params })
+      .pipe(
+        map(response => ({
+          items: this.normalizeItems(response?.items || []),
+          total: response?.total || 0
+        }))
+      );
+  }
+
+  addToCart(itemID: number, quantity: number = 1): Observable<{ message: string }> {
+    return this.http.post<{ message: string }>(`${this.baseUrl}/cart`, { itemID, quantity });
+  }
+
+  updateCartQuantity(itemID: number, quantity: number): Observable<{ message: string }> {
+    return this.http.patch<{ message: string }>(`${this.baseUrl}/cart`, { itemID, quantity });
+  }
+
+  removeFromCart(itemIDs: number[]): Observable<{ message: string }> {
+    return this.http.delete<{ message: string }>(`${this.baseUrl}/cart`, { body: itemIDs });
+  }
+
+  getCart(): Observable<Item[]> {
+    return this.http.get<Item[]>(`${this.baseUrl}/cart`)
+      .pipe(map(items => this.normalizeItems(items)));
+  }
+
+  // Review submission
+  submitReview(reviewData: {
+    itemID: number;
+    rating: number;
+    comment: string;
+    username: string | null;
+    userId: number | null;
+    timestamp: string;
+  }): Observable<{ message: string }> {
+    return this.http.post<{ message: string }>(`${this.baseUrl}/comment`, reviewData);
+  }
+
+  // Payment - SBP Integration
+  createPayment(paymentData: {
+    amount: number;
+    currency: string;
+    siteuserID: string;
+    siteorderID: string;
+    redirectUrl: string;
+    telegramUsername: string;
+    items: Array<{ itemID: number; price: number; name: string }>;
+  }): Observable<{
+    qrId: string;
+    qrStatus: string;
+    qrExpirationDate: string;
+    payload: string;
+    qrUrl: string;
+  }> {
+    return this.http.post<{
+      qrId: string;
+      qrStatus: string;
+      qrExpirationDate: string;
+      payload: string;
+      qrUrl: string;
+    }>(`${this.baseUrl}/cart`, paymentData);
+  }
+
+  checkPaymentStatus(qrId: string): Observable<{
+    additionalInfo: string;
+    paymentPurpose: string;
+    amount: number;
+    code: string;
+    createDate: string;
+    currency: string;
+    order: string;
+    paymentStatus: string;
+    qrId: string;
+    transactionDate: string;
+    transactionId: number;
+    qrExpirationDate: string;
+    phoneNumber: string;
+  }> {
+    return this.http.get<{
+      additionalInfo: string;
+      paymentPurpose: string;
+      amount: number;
+      code: string;
+      createDate: string;
+      currency: string;
+      order: string;
+      paymentStatus: string;
+      qrId: string;
+      transactionDate: string;
+      transactionId: number;
+      qrExpirationDate: string;
+      phoneNumber: string;
+    }>(`${this.qrBaseUrl}/qr/payment/${qrId}`);
+  }
+
+  submitPurchaseEmail(emailData: {
+    email: string;
+    telegramUserId: string | null;
+    items: Array<{ itemID: number; name: string; price: number; currency: string }>;
+  }): Observable<{ message: string }> {
+    return this.http.post<{ message: string }>(`${this.baseUrl}/purchase-email`, emailData);
+  }
+
+  getRandomItems(count: number = 5, categoryID?: number): Observable<Item[]> {
+    let params = new HttpParams().set('count', count.toString());
+    if (categoryID) {
+      params = params.set('category', categoryID.toString());
+    }
+    return this.http.get<Item[]>(`${this.baseUrl}/randomitems`, { params })
+      .pipe(map(items => this.normalizeItems(items)));
+  }
+}