import {Inject, Injectable, InjectionToken, PLATFORM_ID} from '@angular/core';
import { HttpEvent, HttpHandler, HttpInterceptor, HttpRequest } from '@angular/common/http';
import { Observable } from 'rxjs';
import { timeout } from 'rxjs/operators';
import {isPlatformServer} from "@angular/common";
import {properties} from "../../environments/environment";

export const DEFAULT_TIMEOUT = new InjectionToken<number>('defaultTimeout');

@Injectable()
export class TimeoutInterceptor implements HttpInterceptor {
  private static TIMEOUT_WHITELIST = [properties.csvAPIURL, properties.registryUrl];

  constructor(@Inject(DEFAULT_TIMEOUT) protected defaultTimeout: number, @Inject(PLATFORM_ID) private platformId: any) {
  }

  intercept(req: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
    if (req.method !== 'GET' || this.isService(req, TimeoutInterceptor.TIMEOUT_WHITELIST)) {
      return next.handle(req);
    }

    let serverTime = properties.environment == "production" ? 3000 : 4000;
    let clientTime = properties.environment == "production" ? 6000 : 12000;
    const timeoutValue = isPlatformServer(this.platformId)?serverTime:clientTime;//req.headers.get('timeout') || this.defaultTimeout;
    const timeoutValueNumeric = Number(timeoutValue);
    return next.handle(req).pipe(timeout(timeoutValueNumeric));
  }

  isService(req: HttpRequest<any>, service: string | string[]):boolean {
    if(Array.isArray(service)) {
      return !!service.find(element => req.url.indexOf(element) !== -1);
    } else {
      return req.url.indexOf(service) !== -1;
    }
  }
}