import { Injectable } from '@angular/core';
import {HttpResponse} from "@angular/common/http";

@Injectable({
  providedIn: 'root',
})
export class FileService {
    getFilenameFromHttpResponse(httpResponse: HttpResponse<Blob>) {
        const contentDispositionHeader = httpResponse.headers.get('Content-Disposition');
        // console.log(contentDispositionHeader);
        let result = contentDispositionHeader.split(';')[1].trim().split('=')[1];
        // Removing the " from the after trim operation
        result = result.replace(/"/g, '');
        // Removing . from filename
        // return result.replace(/./g, '_');

        return result;
    }

    downloadBlob(data: HttpResponse<Blob>) {
        const url = window.URL.createObjectURL(data.body);
        const anchor = document.createElement('a');

        anchor.download = this.getFilenameFromHttpResponse(data);
        anchor.href = url;
        anchor.click();
        anchor.remove();

        window.URL.revokeObjectURL(url);
    }
}