mempool/frontend/src/app/services/api.service.ts

import { Injectable } from '@angular/core';
import { HttpClient, HttpParams } from '@angular/common/http';
import { OptimizedMempoolStats } from '../interfaces/node-api.interface';
import { Observable } from 'rxjs';
import { StateService } from './state.service';

const API_BASE_URL = '/api{network}/v1';

@Injectable({
  providedIn: 'root'
})
export class ApiService {
  apiBaseUrl: string;

  constructor(
    private httpClient: HttpClient,
    private stateService: StateService,
  ) {
    this.apiBaseUrl = API_BASE_URL.replace('{network}', '');
    this.stateService.networkChanged$.subscribe((network) => {
      this.apiBaseUrl = API_BASE_URL.replace('{network}', network ? '/' + network : '');
    });
  }

  list2HStatistics$(): Observable<OptimizedMempoolStats[]> {
    return this.httpClient.get<OptimizedMempoolStats[]>(this.apiBaseUrl + '/statistics/2h');
  }

  list24HStatistics$(): Observable<OptimizedMempoolStats[]> {
    return this.httpClient.get<OptimizedMempoolStats[]>(this.apiBaseUrl + '/statistics/24h');
  }

  list1WStatistics$(): Observable<OptimizedMempoolStats[]> {
    return this.httpClient.get<OptimizedMempoolStats[]>(this.apiBaseUrl + '/statistics/1w');
  }

  list1MStatistics$(): Observable<OptimizedMempoolStats[]> {
    return this.httpClient.get<OptimizedMempoolStats[]>(this.apiBaseUrl + '/statistics/1m');
  }

  list3MStatistics$(): Observable<OptimizedMempoolStats[]> {
    return this.httpClient.get<OptimizedMempoolStats[]>(this.apiBaseUrl + '/statistics/3m');
  }

  list6MStatistics$(): Observable<OptimizedMempoolStats[]> {
    return this.httpClient.get<OptimizedMempoolStats[]>(this.apiBaseUrl + '/statistics/6m');
  }

  list1YStatistics$(): Observable<OptimizedMempoolStats[]> {
    return this.httpClient.get<OptimizedMempoolStats[]>(this.apiBaseUrl + '/statistics/1y');
  }

  getTransactionTimes$(txIds: string[]): Observable<number[]> {
    let params = new HttpParams();
    txIds.forEach((txId: string) => {
      params = params.append('txId[]', txId);
    });
    return this.httpClient.get<number[]>(this.apiBaseUrl + '/transaction-times', { params });
  }
}