import { HttpInterceptor, HttpRequest, HttpHandler, HttpEvent } from '@angular/common/http';
import { Observable } from 'rxjs';
import { LoadingService } from '@karmed/core';
import { finalize } from 'rxjs/operators';
import { Injectable } from '@angular/core';

@Injectable()
export class LoadingInterceptor implements HttpInterceptor {
    constructor(private loadingService: LoadingService) { }
    private requests: HttpRequest<any>[] = [];
    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        this.requests.push(request);
        this.loadingService.isLoading.next(true);
        return next.handle(request).pipe(finalize(()=> this.removeRequest(request)));
    }

    removeRequest(req: HttpRequest<any>) {
        const i = this.requests.indexOf(req);
        if (i >= 0)
            this.requests.splice(i, 1);
        this.loadingService.isLoading.next(this.requests.length > 0);
    }
}